Introduction
Sepsis is widely recognized as a critical condition triggered by severe infections, and its definition has evolved from Sepsis 1.0 in 1991 to Sepsis 3.0 in 2016.1,2 Sepsis is currently understood as a systemic inflammatory response to infection, where an excessive immune response can lead to multi-organ failure and shock. It remains one of the most common and life-threatening conditions in clinical practice. Due to its high mortality rate and the frequent occurrence of complex complications, sepsis imposes a significant economic and social burden worldwide.2–4 According to data from 409 hospitals in the United States, approximately 1.7 million patients develop sepsis annually, with this number steadily rising.5 A cross-sectional study conducted across 44 hospitals in China found that the 90-day mortality rate for hospitalized sepsis patients was around 35.5%.6 The heart, which is rich in mitochondria, is one of the primary target organs affected by sepsis. Sepsis-induced myocardial dysfunction (SIMD) is a poor prognostic indicator in sepsis patients, characterized by adverse outcomes and an increased mortality rate.7 Epidemiological studies suggest that myocardial injury or heart failure is commonly observed in sepsis patients, with an incidence ranging from 10% to 70%.8–10
During sepsis, myocardial hypoxia, coupled with mitochondrial dysfunction and oxidative stress, leads to cardiac dysfunction and hemodynamic instability. This is primarily manifested by left ventricular dilation, normal or reduced filling pressures, decreased ventricular contractility, and right or left ventricular dysfunction, resulting in a diminished response to volume infusion.11,12 Current treatment strategies for SIMD focus on two main approaches: one involves traditional symptomatic management such as fluid resuscitation and antimicrobial therapy, which often show limited efficacy. The other emerging approach includes advanced technologies like extracorporeal membrane oxygenation (ECMO) and remote ischemic conditioning (RIC), which offer potential benefits for cardiac and pulmonary support in sepsis patients. However, these advanced interventions are costly and increase the financial burden on patients. Furthermore, they are predominantly available in large, tertiary hospitals with specialized intensive care units, making their routine use impractical. Thus, exploring the molecular mechanisms underlying SIMD is critical to developing targeted therapies. Several factors contribute to the pathogenesis of SIMD, including the activation of inflammatory responses, dysregulation of calcium homeostasis, mitochondrial dysfunction, oxidative stress, and cell death.13–16 Recent studies have shown that when the host encounters injury, infection, or viral invasion, pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs) are activated. The body’s pattern recognition receptors (PRRs) recognize specific pathogen structures, triggering the release of pro-inflammatory mediators and initiating an inflammatory cascade. A controlled inflammatory response can facilitate immune activation, enabling pathogen clearance and defending against external threats.17 Nevertheless, when the inflammatory response becomes dysregulated, it can trigger immune dysfunction, contributing to sepsis and damage to target organs, including the heart.
NLRP3 (Nucleotide-binding oligomerization domain-like receptor family pyrin domain containing 3) is a well-established cytosolic pattern recognition receptor that plays a pivotal role in cellular responses to stress signals.18 It is predominantly activated during host infections or inflammatory responses, leading to the assembly of the NLRP3 inflammasome, which subsequently induces apoptosis or pyroptosis.18 As a crucial sensor of the innate immune system, NLRP3 detects various DAMPs and initiates inflammatory responses.19 Recent studies have highlighted that NLRP3 modulates several pathophysiological processes, including pyroptosis, oxidative stress, autophagy, and mitochondrial dysfunction. Inhibition of NLRP3 has been shown to mitigate sepsis-induced myocardial injury and improve survival outcomes.20 For example, Zhang et al demonstrated that in a cecal ligation and puncture (CLP) mouse model of sepsis and lipopolysaccharide (LPS)-stimulated cardiac fibroblasts, corticosteroid treatment effectively suppressed the formation of the NLRP3 inflammasome, caspase-1 activation, and IL-1β secretion, thereby offering protection against myocardial damage.21 Likewise, Qiu et al showed that high-dose ulinastatin (UTI) attenuated NLRP3 inflammasome activation, resulting in myocardial protection and enhanced survival rates in septic rats.22
Recent research has increasingly underscored the critical role of aberrant NLRP3 inflammasome activation in driving a variety of inflammatory responses, including SIMD. The NLRP3 inflammasome is integral to a range of pathological processes such as pyroptosis, oxidative stress, autophagy, and mitochondrial dysfunction, and it is also involved in modulating the cardiac impairment associated with sepsis. Despite these advances, the current body of research remains dispersed, and a systematic review that consolidates these findings is lacking. Therefore, there is a pressing need for a comprehensive synthesis of the existing literature to enhance our understanding of SIMD. This review aims to provide a thorough analysis of the specific role of the NLRP3 inflammasome and the inflammatory pathways it orchestrates in the pathogenesis of septic myocardial dysfunction. We will focus on the NLRP3 inflammasome’s involvement in various mechanistic pathways, including pyroptosis, oxidative stress, autophagy, mitochondrial injury, exosome secretion, and endoplasmic reticulum stress. Additionally, we will explore how these processes may contribute to the pathophysiological development of SIMD. Finally, the review will summarize the principal signaling pathways implicated in SIMD and briefly discuss current therapeutic strategies and their potential molecular targets for mitigating SIMD.
NLRP3 Inflammasome
Composition of NLRP3 Inflammasome
The NLRP3 inflammasome is a multi-protein complex composed of various intracellular components that recognize and respond to activation signals through cytosolic sensors.23 These sensors include nucleotide-binding oligomerization domain (NBD), nucleotide-binding oligomerization domain-like receptors (NLRs), adaptor proteins, and effector molecules.23 The assembly of the inflammasome typically involves PRRs, apoptosis-associated speck-like protein (ASC), and caspase-1. PRRs involved in pathogen recognition are classified into two categories: membrane-bound PRRs, such as Toll-like receptors (TLRs) and C-type lectin receptors, and cytosolic PRRs, such as NLRs and retinoic acid-inducible gene I-like receptors (RIG-I-like receptors).24 Some PRRs are capable of recognizing conserved microbial components or PAMPs, including peptidoglycan.24 They can also detect DAMPs, which are released from cells or tissues undergoing injury, such as adenosine triphosphate (ATP).24 Notably, not all of the aforementioned PRRs are involved in inflammasome formation. For instance, RIG-I-like receptors primarily detect viral RNA in the cytoplasm of infected cells, triggering the synthesis of type I interferons to initiate an antiviral response, but they are not directly related to inflammasome formation.25 To date, five PRRs have been identified that are capable of forming inflammasomes: NLRP1, NLRP3, NLRC4, Pyrin, and AIM2.26–29 These PRRs are considered to play important roles in pathological conditions, such as myocarditis.26–29 The activated inflammasome detects DAMPs released from damaged cells and PAMPs derived from pathogens in the gut-liver axis. The assembly of these complexes induces the activation of caspase-1, which subsequently participates in the caspase-1-dependent pyroptotic pathway. Current research has demonstrated that the NLRP3 inflammasome plays a critical role in the inflammatory response in cardiomyocytes, immune cell activation, and myocardial injury.29 Therefore, the NLRP3 inflammasome is regarded as a key player in the inflammatory response associated with SIMD.30 Targeting the NLRP3 inflammasome for therapeutic intervention in SIMD holds great promise for the future.
The NLRP3 inflammasome is a large multimeric protein complex with an approximate molecular mass of 700,000 Da, composed of NLRP3, the adaptor protein ASC, and the effector protein caspase-1.31 The assembly of the NLRP3 inflammasome requires interactions between the NLRP3 receptor, the adaptor protein ASC, and pro-caspase-1.31
NLRP3 is a member of the NLR (nucleotide-binding oligomerization domain-like receptor) family, which share a conserved structural framework. NLRP3 itself consists of three main structural domains. Leucine-rich repeat (LRR) domain at the C-terminus, which is primarily responsible for recognizing and binding PAMPs or DAMPs.32 This domain engages with microbial or host-derived signals that trigger immune responses.32 It is vital to note that the activation of the NLRP3 inflammasome does not always occur through direct interaction with PAMPs or DAMPs. It can also be triggered by secondary mechanisms, such as disruption of the mitochondrial membrane potential or potassium efflux.33–35 Nucleotide-binding oligomerization domain (NACHT) in the central region, which facilitates self-oligomerization and is involved in mediating the formation of inflammasome complexes. This domain shares similarities with other proteins such as NAIP, CIITA, HET-E, and TP1. Caspase recruitment domain (CARD), pyrin domain (PYD), and baculovirus inhibitor of apoptosis protein repeat (BIR) domains at the N-terminus, which are involved in downstream protein-protein interactions. These domains facilitate the recruitment of other proteins necessary for inflammasome assembly and subsequent activation of caspase-1, leading to pyroptosis and inflammatory responses. Through the coordinated function of these domains, NLRP3 detects a wide range of PAMPs and DAMPs, triggering the assembly of the inflammasome complex and activating caspase-1, which plays a crucial role in the inflammatory response and cellular damage.
Under basal conditions, the NACHT domain of NLRP3 interacts with the LRR domain, thereby maintaining the protein in a self-inhibited conformation. The NACHT domain, which possesses ATPase activity, represents the central structural and functional unit of NLRs. Upon the detection of PAMPs or DAMPs, NLRP3 undergoes a conformational shift that disrupts its autoinhibition, resulting in the exposure of the NACHT domain and its subsequent oligomerization. This process enables NLRP3 to function as a scaffold for inflammasome assembly.36 The N-terminal PYD of NLRP3 recruits the adaptor protein ASC, which also contains a PYD domain. The CARD of ASC then recruits pro-caspase-1, which contains a CARD domain, facilitating the assembly of the inflammasome complex.36 In addition to these interactions, the domains of NLRP3 and its associated proteins are capable of engaging with other ligands, thereby activating downstream signaling pathways that regulate cellular responses and contribute to the inflammatory response.
ASC is recognized as a crucial adaptor protein closely involved in the formation of the NLRP3 inflammasome and its associated cell death mechanisms. Current studies on its structure and function reveal that ASC comprises two key domains: the PYD at the C-terminus and the CARD at the N-terminus.37 Under conditions of cell damage or infection, activation of pattern recognition receptors, such as NLRP3, triggers the binding of its PYD domain to ASC, which in turn facilitates the interaction between ASC’s CARD domain and caspase-1, leading to the activation of caspase-1. Activated caspase-1 then cleaves pro-inflammatory cytokines, such as IL-1β and IL-18, thereby initiating their secretion and triggering an inflammatory response.37 Furthermore, during ASC activation, visible intracellular aggregates known as ASC specks are formed. These specks are a result of ASC aggregation and indicate the process of inflammasome assembly. ASC specks are considered a marker of inflammasome activity, and their formation is essential for the detection and study of inflammasome activation.38
Caspase-1, alternatively referred to as interleukin-1β converting enzyme (ICE), functions as the effector protease within the NLRP3 inflammasome complex. Initially present as an inactive zymogen, caspase-1 is activated through interaction with upstream signals, leading to the formation of a highly conserved protease complex. Caspase-1 is involved in a variety of physiological processes, including signal transduction and transcriptional regulation.39 Its primary role is to cleave precursor forms of interleukins (pro-IL-1β and pro-IL-18) into their mature, biologically active forms, IL-1β and IL-18.39 These pro-inflammatory cytokines are critical for the regulation of innate immune responses and play key roles in the pathogenesis of numerous inflammatory and autoimmune disorders.40,41
Activation of the NLRP3 Inflammasome
The activation of the NLRP3 inflammasome facilitates the activation of pro-caspase-1 and the release of key inflammatory cytokines, which is crucial for the onset and progression of septic cardiomyopathy. The mechanism of NLRP3 inflammasome activation is complex, involving various inflammatory pathways and processes.42 The prevailing hypothesis for NLRP3 inflammasome activation is the “two-signal model”, which includes both the “priming” signal and the “activation” signal.43,44 First, the “priming” signal provided by microbial or endogenous molecules is transduced via the TLR signaling pathway, leading to the activation of the NF-κB pathway. The transcriptional activity of NF-κB is tightly regulated by both intracellular and extracellular mechanisms. NF-κB remains inactive in the cytoplasm in complex with IκB.45 Post-translational modifications or ubiquitination of IκB, in response to extracellular signaling, leads to its degradation, enabling NF-κB to translocate to the nucleus and become activated.45 Bacterial components bind to TLRs and activate NF-κB transcriptional activity through the MyD88, IRAK, and TRAF6 signaling cascade.46 As a result, the baseline expression of pro-IL-1β and NLRP3 proteins is significantly increased. Notably, the priming signal also induces post-translational modifications of NLRP3, such as deubiquitination and phosphorylation, to promote subsequent inflammasome activation.47 For instance, NLRP3 can be considered a substrate of the BRISC complex containing the cytoplasmic BRCC3, which deubiquitinates NLRP3 and activates the inflammasome.48 Once the priming signal is complete, various DAMPs and PAMPs trigger the assembly of the NLRP3 inflammasome through homologous interactions within its NACHT domain.
The activation signal in the second step can occur via three main pathways: the first involves extracellular ATP, which stimulates ion channels, promoting K+ efflux and the formation of membrane channels, directly facilitating the assembly and activation of the NLRP3 inflammasome.33 The P2X7 receptor acts as a cation channel activated by ATP, allowing K+ efflux.49 K+ efflux is widely recognized as a key mechanism in NLRP3 inflammasome activation.50 The second pathway involves the internalization of extracellular crystals or specific particles, such as calcium or chloride ions, leading to lysosomal rupture and facilitating the aggregation and activation of the NLRP3 inflammasome.34 The third pathway involves PAMPs and DAMPs, which, through ROS-dependent signaling, enhance intracellular ROS production and promote NLRP3 inflammasome assembly and activation.35 Studies have shown that NLRP3 activators can initiate the production of mitochondrial ROS (mtROS), which further oxidize mtDNA. mtDNA, a potent inducer of IL-1β production, can co-localize with NLRP3 and promote inflammasome activation.51–53
In addition to the aforementioned factors, some non-degradable substances can activate the NLRP3 inflammasome through “frustrated phagocytosis”. Many non-digestible particles are taken up by macrophages into intracellular phagolysosomes, leading to the release of stress-related substances and lysosomal proteases into the cytoplasm. For example, Cathepsin B, a representative lysosomal protease, can activate the NLRP3 inflammasome.54,55
The Role of NLRP3 Inflammasome in SIMD
Multiple studies have demonstrated that the activation of the NLRP3 inflammasome regulates myocardial inflammation in sepsis-induced myocardial injury through various intracellular pathways, including oxidative stress, pyroptosis, autophagy, mitochondrial dysfunction, exosome response, and endoplasmic reticulum (ER) stress. In the following sections, we will elaborate on the role of the NLRP3 inflammasome in septic cardiomyopathy from these perspectives.
Role of the NLRP3 Inflammasome in Pyroptosis-Mediated Pathogenesis of SIMD
Pyroptosis is a form of programmed cell death that functions as a defensive response to cellular injury or infection; however, when dysregulated, it can contribute to extensive tissue damage and the onset of sepsis. This process is largely mediated by members of the gasdermin (GSMD) protein family, which form pores in the plasma membrane, leading to the release of pro-inflammatory cytokines such as IL-1β and IL-18.56 Key features of pyroptosis include the formation of membrane pores, cellular swelling, membrane rupture, and the subsequent release of inflammatory mediators and cellular contents into the extracellular space.57,58 The excessive release of these cytokines plays a central role in driving the inflammatory cascade seen in sepsis. As such, pyroptosis is closely associated with both the systemic inflammatory response and the resultant organ dysfunction in sepsis, particularly in the context of SIMD. In a study by Kalbitz et al, it was observed that in a CLP-induced sepsis model, the expression levels of NLRP3 and IL-1β were markedly elevated in the left ventricular myocardium.59 Notably, in mice with NLRP3 gene knockdown, both cardiovascular damage and plasma levels of IL-1β and IL-6 were significantly reduced compared to wild-type controls. These findings suggest that the NLRP3 inflammasome plays a critical role in the pathogenesis of SIMD by driving pyroptosis-mediated myocardial injury59 (Figure 1).
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Figure 1 Role of the NLRP3 Inflammasome in Pyroptosis-Mediated Pathogenesis of SIMD. NLRP3 inflammasome-mediated pyroptosis can be classified into two distinct types based on the dependence on caspase-1. In caspase-1-dependent pyroptosis, the process is initiated by the assembly of the inflammasome. In contrast, caspase-1-independent pyroptosis is triggered by the interaction between caspase-4, caspase-5, or caspase-11 (depending on the species) and LPS.
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Classic Pathways of Pyroptosis in SIMD
The prevailing view in the field of SIMD suggests that the classical pyroptosis pathway can be classified into two types based on whether or not it depends on caspase-1.50 In the classical caspase-1-dependent pyroptosis pathway, when the body recognizes DAMPs and PAMPs in response to various endogenous and exogenous stimuli, the NLRP3 inflammasome is activated by these signals. The inflammasome then interacts with the adaptor protein ASC, leading to the activation of pro-caspase-1, which is subsequently cleaved into active caspase-1.60 On one hand, active caspase-1 cleaves Gasdermin D (GSDMD), a protein belonging to the GSDM family, which is a key player in pyroptosis. The structure of GSDMD consists of a toxic N-terminal domain and a C-terminal inhibitory domain connected by a flexible linker. Upon cleavage of the C-terminal domain, the N-terminal domain of GSDMD is recruited to the cell membrane, where it interacts with lipids, forming intermediate structures known as pre-pores.61 These pre-pores undergo conformational rearrangement, forming oligomeric arcs that further transition into ring-like structures, which ultimately form membrane pores.61 This pore formation leads to the release of cellular contents and triggers pyroptosis.61 Electron microscopy reveals that the inner diameter of the GSDMD-N pore is 10–15 nm, allowing the passage of pro-inflammatory cytokines such as IL-1β and IL-18, thereby enhancing the inflammatory response.62,63 Additionally, the transcription of GSDMD is regulated by multiple molecules.64 For example, in adipocytes, NF-κB can activate the transcription of GSDMD, while in endothelial or macrophage cells, activation of IRF1/2 can enhance GSDMD expression.65–67 As a key effector molecule of the inflammasome, inhibiting the cleavage and oligomerization of GSDMD can block its role in pyroptosis, potentially providing a therapeutic strategy for disease treatment. On the other hand, activated caspase-1 cleaves and activates the precursor forms of IL-1β and IL-18. The mature cytokines are then released extracellularly, further amplifying the inflammatory response.
In the caspase-1-independent pyroptosis pathway, following LPS stimulation, caspase-4, caspase-5, and caspase-11 can directly bind to LPS and become activated, leading to the cleavage of GSDMD and the exposure of its N-terminal domain, initiating pyroptosis. Furthermore, the activation of caspase-4/5/11 also activates the Pannexin-1 channel and facilitates the release of K+ ions, which in turn activates the NLRP3 inflammasome, leading to the activation of caspase-1 and further pyroptosis via the caspase-1-dependent pathway.68 Notably, the NLRP3 inflammasome/caspase-1/IL-1β pathway is implicated in the development of SIMD due to excessive inflammation.69,70 In a mouse model of SIMD, Busch et al observed that compared to wild-type septic mice, NLRP3 knockout mice exhibited lower serum levels of IL-1β, reduced cardiac and cardiomyocyte atrophy, improved cardiac diastolic and systolic functions, and increased survival rates.71 Furthermore, Intermedin1-53 (IMD1-53) suppressed NLRP3 activity through the NLRP3/caspase-1/IL-1β pathway in septic cardiomyocytes, thereby alleviating SIMD.72 In conclusion, targeting NLRP3 inflammasome-mediated pyroptosis to mitigate SIMD presents a promising new therapeutic target for the prevention and treatment of septic cardiomyopathy.
Classic Signaling Pathways of Pyroptosis in SIMD
Studies have shown that the ER/SIRT1/NLRP3/GSDMD signaling pathway, mediated by the NLRP3 inflammasome, is one of the classical pathways involved in SIMD, regulating pyroptosis and contributing to the pathogenesis of SIMD.73 Inhibiting this signaling pathway effectively suppresses pyroptosis and alleviates the symptoms of SIMD.73 Additionally, the STING-IRF3 pathway can activate the NLRP3 inflammasome, further participating in the progression of SIMD. In an endotoxemic model mimicking Gram (-) bacterial sepsis via LPS, Li et al found that after LPS treatment, STING undergoes perinuclear translocation, interacts with interferon regulatory factor 3 (IRF3), and phosphorylates IRF3.74 The phosphorylated IRF3 is subsequently transported to the nucleus, where it increases NLRP3 expression and activates the NLRP3 inflammasome, triggering myocardial cell apoptosis and pyroptosis, ultimately leading to heart dysfunction. Knockout of the STING gene, inhibition of IRF3 phosphorylation, and blocking its nuclear translocation significantly reduced NLRP3-mediated myocardial inflammation and improved sepsis-induced myocardial injury.74 Similarly, the SMC4/NEMO signaling pathway has been identified as a promoter of NLRP3 vesicle activation, inducing myocardial cell pyroptosis and contributing to SIMD development.75
Moreover, transcription factors play a crucial role in the activation of the NLRP3 inflammasome, influencing the onset and progression of sepsis-induced myocardial disease. NF-κB facilitates the activation and assembly of the NLRP3 inflammasome by upregulating the transcription of NLRP3 and pro-IL-1β.76 The p65 subunit directly binds to the NLRP3 gene promoter, regulating LPS-induced NLRP3 expression in brain microvascular endothelial cells (BMECs).77 Interestingly, the expression of nuclear factor erythroid 2-related factor 2 (Nrf2) is negatively correlated with the activation of pyroptosis and the development of sepsis-induced myocardial dysfunction.78,79 Based on these findings, some researchers propose that melatonin, by activating the Nrf2 pathway and inhibiting NLRP3 inflammasome formation, could alleviate sepsis-induced myocardial injury.80
In summary, when the NLRP3 inflammasome is activated by a range of danger signals, including hypoxia, PAMPs, DAMPs, and molecules associated with metabolic disturbances (such as ATP and K⁺), the GSDMD pores open, and IL-1β and IL-18 are released into the bloodstream. This leads to widespread inflammatory responses and immune dysregulation, ultimately triggering sepsis and sepsis-induced myocardial injury. Therefore, targeting the inhibition of the NLRP3 inflammasome and its associated pyroptosis pathway may represent a potential therapeutic strategy for SIMD.
The Role of NLRP3 Inflammasome via Oxidative Stress in SIMD
ROS are by-products of oxygen metabolism and possess highly reactive properties. They primarily include peroxides, superoxides, hydroxyl radicals, and singlet oxygen.81 ROS participate in various physiological processes such as differentiation, proliferation, necrosis, autophagy, and apoptosis by acting as signaling molecules or regulatory factors, often functioning as transcriptional activators.82 In this context, maintaining appropriate cellular ROS levels is essential for redox homeostasis.83 Furthermore, ROS serve as antimicrobial agents, capable of directly destroying microbial pathogens.84 However, an excess of ROS can have detrimental effects. For instance, oxidative stress arises from an imbalance between ROS production and antioxidant defense mechanisms.85 Studies have shown that during sepsis, stressors such as hypoxia led to an overproduction of ROS, which induces significant cellular apoptosis and organ dysfunction, contributing to sepsis and target organ damage.86 Additionally, ROS are known to promote apoptosis, mitochondrial oxidation, and alterations in cellular signaling pathways. It is well-established that the onset of sepsis is associated with a range of dysregulated inflammatory responses, and ROS have been found to be closely linked to the NLRP3 inflammasome in inflammation. Therefore, the roles of ROS and the NLRP3 inflammasome in sepsis and related organ damage are of great interest. Research on the interaction between ROS and the NLRP3 inflammasome in the pathophysiological processes of septic cardiomyopathy primarily focuses on the following areas (Figure 2).
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Figure 2 The Role of NLRP3 Inflammasome via Oxidative Stress in SIMD. Sepsis-induced oxidative stress promotes the generation of ROS through mitochondrial oxidation. The activation of P2X7 receptors by PAMPs and DAMPs triggers the influx of Ca2+ and the efflux of K+. The resulting calcium overload and ROS disrupt mitochondrial integrity, leading to the release of cytochrome C into the cytoplasm. This process facilitates the assembly of NLRP3 inflammasomes and induces apoptosis. Additionally, LPS activates the NF-κB signaling pathway, which promotes the expression of pro-IL-1β and pro-IL-18. Subsequently, activated caspase-1 cleaves pro-IL-1β and pro-IL-18 into their active forms.
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The Production of ROS Is Partially Dependent on the Activation of NLRP3 in SIMD
NLRP3 is a widely recognized cellular stress sensor, whose activation is closely associated with the generation of ROS and subsequent inflammasome activation.87,88 Studies have shown that LPS triggers ROS production through the activation of TLR4, a key event in the initial activation of NLRP3.89,90 The P2X7 receptor, a trimeric ATP-gated cation channel, facilitates increased membrane permeability, resulting in potassium (K⁺) efflux. During sepsis and its associated renal and myocardial injuries, ATP stimulates NLRP3 inflammasome activation via P2X7 receptor-mediated feedback mechanisms, leading to the processing and release of IL-1β.91,92 The production of ROS is often linked to K⁺ efflux, suggesting that a decrease in intracellular K⁺ concentrations may play a role in inducing ROS generation during NLRP3 inflammasome activation.93 Therefore, it can be hypothesized that ROS production in sepsis-induced myocardial injury may be dependent on the synergistic activation of the P2X7 receptor and the NLRP3 inflammasome.94 Based on this, targeting the activation of the NLRP3 inflammasome and inhibiting excessive ROS production and oxidative stress may offer a novel therapeutic strategy for sepsis-related cardiomyopathy.
ROS Promotes the Activation of the NLRP3 Inflammasome in SIMD
Recent studies have indicated that ROS are potential signals for the activation of the NLRP3 inflammasome. Two main hypotheses have been proposed regarding the role of ROS in promoting NLRP3 inflammasome activation. The first hypothesis involves thioredoxin-interacting protein (TXNIP). It has been demonstrated that ROS are sensed by a complex consisting of thioredoxin (TXN) and TXNIP.94 The TXNIP-TRX system, along with NADPH and thioredoxin reductase (TRX-R), forms a redox system.94 TRX exists in different isoforms, including TRX1 (12 kDa) in the cytoplasm and TRX2 (15.5 kDa) in the mitochondria.95 TRX functions to reduce oxidized proteins, leading to the oxidation of its two cysteine residues, and alternates between oxidized (inactive) and reduced (active) states.96 Oxidized TRX is converted to its reduced form via NADPH-dependent TRX-R activity, which catalyzes the transfer of electrons from NADPH to oxidized TRX, thereby regulating the cellular redox balance.97 The primary physiological function of the TRX system is to remove ROS and protect cells from oxidative damage while maintaining a reducing intracellular environment. TRX1 and TRX2 regulate ROS levels in the cytoplasm and mitochondria, respectively. However, TXNIP inhibits the antioxidant activity of TRX.98 Under physiological conditions, TXNIP is localized to the nucleus, preventing its translocation to the cytoplasm. Under ROS-overproducing conditions, TXNIP upregulates its expression by inhibiting the phosphorylation of AMP-activated protein kinase (AMPK), which triggers the nuclear-to-cytoplasmic translocation of TXNIP, leading to endoplasmic reticulum and mitochondrial stress.99 On one hand, the translocation of TXNIP from the nucleus to the cytoplasm promotes its interaction with TRX1, inhibiting TRX1 activity.100 On the other hand, TXNIP translocated to the mitochondria, where it binds to TRX2 via disulfide bonds, inhibiting the reducing function of TRX2 and oxidizing it, forming the TXNIP/TRX2 complex.96 TXNIP dissociates TRX2 from apoptosis signal-regulating kinase 1 (ASK1), triggering mitochondrial ROS generation and inducing ASK1 phosphorylation.101 Phosphorylated ASK1 stimulates cytochrome c (Cyto c) release, leading to caspase 3 activation and mitochondrial apoptosis.101 As mentioned earlier, NF-κB activation is considered the first step in NLRP3 inflammasome activation.102 The second step involves the direct interaction between TXNIP and NLRP3, which is redox-state-dependent. The activation of pro-inflammatory pathways promotes the nuclear-to-mitochondrial translocation of TXNIP, where it forms a complex with TRX2. This process promotes mitochondrial ROS accumulation, oxidizing TRX2 and releasing TXNIP in the mitochondria.101,103 TXNIP binds to the pyrin domain of NLRP3, followed by the recruitment of ASC’s CARD domain, which interacts with the pro-caspase-1 precursor.104 These interactions result in the formation of the NLRP3 inflammasome and the cleavage of pro-caspase-1, leading to the activation of caspase-1 and triggering a widespread inflammatory response. Therefore, the association between TXNIP and NLRP3 is not a direct ROS-sensing mechanism but rather a secondary effect under oxidative stress conditions.105 Li et al found that LPS stimulation promotes ROS generation, further inducing the translocation of NLRP3 from the nucleus. Isolated TXNIP can directly interact with NLRP3 and form the inflammasome, ultimately causing myocardial cell damage.74 Yang et al discovered that knockdown of TXNIP expression inhibited NLRP3 inflammasome activation, accompanied by ROS production and increased activity of catalase and manganese superoxide dismutase (MnSOD), which alleviated SIMD.106
The second hypothesis is related to mtROS and mtDNA. Mitochondria are the primary sites for ROS production and are also the key cellular organelles targeted by ROS. NLRP3 activation factors can initiate the generation of mtROS, which can further oxidize mtDNA.107,108 Ultimately, mtDNA acts as a potent inducer of IL-1β production and can co-localize with NLRP3, promoting the activation of the NLRP3 inflammasome and triggering septic shock and target organ damage.51,53,109,110 Shimada et al observed the co-localization of mtDNA and NLRP3 through microscopy, confirming their interaction.53 Qin et al found that Suhuang antitussive capsule (Suhuang) inhibits the inflammatory response and target organ damage of sepsis by maintaining mitochondrial homeostasis and suppressing ROS production and NLRP3 inflammasome activation.111
ROS-Mediated Activation of the NLRP3 Inflammasome May Trigger Apoptosis in SIMD
Previous studies have indicated that excessive ROS can induce apoptosis through both endogenous and exogenous pathways. In the exogenous pathway, Fas ligand participates in ROS production, subsequently recruiting the Fas-associated death domain and initiating apoptosis. In the endogenous pathway, mitochondrial damage, along with a cascade of caspase activation and oxidative stress, leads to the release of damaged cytochrome c and DNA, triggering apoptosis. In septic cardiomyopathy, excessive ROS can open mitochondrial permeability transition pores (mPTPs), resulting in the release of cytochrome c, apoptosis-inducing factor, mtDNA, and other factors into the extracellular space, which in turn activates the NLRP3 inflammasome and induces septicemia and septic myocardial injury. Additionally, caspase-1 activation following NLRP3 inflammasome stimulation exacerbates mitochondrial damage, increases cell membrane permeability, and enhances endothelial permeability to small molecules, thereby promoting apoptosis through a positive feedback loop.112 Song et al demonstrated that geniposide (GE) activates AMPKα to inhibit myocardial ROS accumulation, thereby blocking NLRP3 inflammasome-mediated cardiomyocyte apoptosis and improving cardiac function in septic mice.113 Similarly, Atractylenolide I was found to downregulate the PARP1/NLRP3 signaling pathway, inhibit LPS-induced M1 polarization in RAW 264.7 cells, and reduce oxidative stress and apoptosis in H9c2 cells, thus alleviating septic myocardial injury.114
Taken together, the prevailing view suggests that ROS and the NLRP3 inflammasome exert a reciprocal enhancing effect. However, some studies have also found that ROS can participate in autophagy to inhibit DAMPs and PAMPs, thereby limiting NLRP3-mediated inflammatory responses. Therefore, the interaction between ROS and the NLRP3 inflammasome in the pathogenesis of septic cardiomyopathy is complex. Further research is needed to elucidate the specific molecular mechanisms underlying this process.
The Role of NLRP3 Inflammasome via Mitochondrial Damage in SIMD
The myocardium, characterized by its high mitochondrial content, plays a crucial role in cellular energy metabolism. In the pathogenesis and progression of sepsis, myocardial hypoxia triggers mitochondrial damage or dysfunction, leading to metabolic disturbances, oxidative stress, immune dysregulation, and energy depletion in cardiomyocytes. Ultimately, this results in myocardial injury and functional failure, severely impacting the prognosis of septic patients. In the pathophysiology of SIMD, mitochondrial dysfunction is primarily characterized by the activation of oxidative stress, increased mitochondrial membrane permeability, mitochondrial uncoupling, disturbances in mitochondrial bioenergetics, and mitochondrial autophagy. Recent studies suggest that cellular stress, induced by factors such as infection or external stimuli, can precipitate mitochondrial dysfunction, which, in turn, triggers the activation of the NLRP3 inflammasome through multiple signaling pathways. This process further exacerbates septic myocardial damage. In SIMD, the interplay between mitochondrial dysfunction and NLRP3 inflammasome activation is primarily manifested in two central mechanisms (Figure 3).
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Figure 3 The Role of NLRP3 Inflammasome via mitochondrial damage in SIMD. Mitochondrial damage leads to the accumulation of ROS within the cell. ROS are released into the cytoplasm, where they interact with NLRP3 proteins, thereby triggering the activation of the NLRP3 inflammasome. Impaired mitochondria can also induce a high influx of Ca2+ through the mitochondrial calcium uniporter and produce large amounts of ROS, leading to the release of mtDNA into the cytoplasm, which further activates the NLRP3 inflammasome and induces apoptosis. However, the activation of the kinase 1/Parkin pathway promotes the removal of damaged and dysfunctional mitochondria, reduces the levels of ROS and mtDNA, and inhibits the activity of the NLRP3 inflammasome. After mitochondrial damage, cardiolipin redistributes to the outer mitochondrial membrane and directly interacts with the LRR domain of NLRP3 to activate the inflammasome.
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Mitochondrial Damage Activates the NLRP3 Inflammasome in SIMD
Mitochondria represent the primary source of mtROS, which play a critical role in cellular stress responses. The accumulation of ROS within the mitochondria subsequently spills over into the cytoplasm, where it interacts with the NLRP3 protein, thereby initiating the activation of the NLRP3 inflammasome.115 Excessive ROS production not only triggers the inflammasome pathway but also activates downstream inflammatory cascades mediated by TLRs, contributing to the exacerbation of myocardial injury in the context of sepsis.116 In addition to inflammasome activation, ROS accumulation promotes oxidative modifications of cellular macromolecules, such as proteins and DNA, which leads to structural damage to mitochondria.117 This damage increases mitochondrial membrane permeability and activates apoptotic pathways, including the release of cytochrome c, which triggers cardiomyocyte apoptosis.117 Recent studies by Bronner et al have shown that inositol-requiring enzyme 1α (IRE1α) can mediate ROS-dependent translocation of NLRP3 to the mitochondrial-associated endoplasmic reticulum membrane, thereby facilitating the activation of the caspase signaling axis and the pro-apoptotic protein Bid.118 This interaction further enhances the release of mitochondrial DAMPs, which contribute to the amplification of NLRP3 inflammasome formation. In the pathophysiology of SIMD, mitochondrial dysfunction is central to disease progression. Moreover, damaged mitochondria facilitate excessive calcium influx via the mitochondrial calcium uniporter (MCU), further elevating ROS levels and promoting the release of mitochondrial DNA into the cytoplasm. These events converge to activate the NLRP3 inflammasome, driving an inflammatory response and ultimately leading to cardiomyocyte apoptosis, which plays a pivotal role in SIMD.112
It is noteworthy that sepsis and organ dysfunction are primarily characterized by hypoxia and ROS production. Hypoxia-induced mitochondrial dysfunction not only activates the NLRP3 inflammasome but also alters cellular metabolic pathways, inducing metabolic reprogramming. Under normal conditions, cells utilize transport proteins to uptake long-chain fatty acids, facilitating their oxidation within the mitochondria to generate acetyl-CoA, FADH2, and NADH. These metabolites further participate in the tricarboxylic acid (TCA) cycle and enter the electron transport chain to produce ATP. However, during sepsis, cellular hypoxia and metabolic alterations lead to a metabolic shift from fatty acid oxidation (FAO)-driven oxidative phosphorylation (OXPHOS) to glycolysis via the activation of the HIF-α (hypoxia-inducible factor) signaling pathway. Glycolysis provides ATP by generating pyruvate, which is subsequently converted to lactate, in order to meet the energy demands of immune responses.119 Studies have shown that lidocaine significantly inhibits the secretion of inflammatory cytokines induced by LPS, exerting anti-inflammatory effects through the suppression of hypoxia inducible factor-1(HIF-1α)-mediated glycolysis.120 In conclusion, mitochondrial dysfunction induced by cellular hypoxia not only activates the NLRP3 inflammasome but also induces metabolic reprogramming, playing a crucial role in the pathogenesis of septic cardiomyopathy.
Mitochondrial Autophagy Can Suppress the Activation of the NLRP3 Inflammasome in SIMD
As previously discussed, mitochondrial dysfunction can trigger excessive ROS release, leading to the activation of the NLRP3 inflammasome. However, in sepsis-induced cardiomyopathy, mitochondrial damage can also activate mitochondrial autophagy mechanisms. Specifically, this occurs through the activation of the AMPK/Parkin pathway, which facilitates the clearance of damaged and dysfunctional mitochondria, thereby reducing ROS and mtDNA levels, and inhibiting NLRP3 inflammasome activation.121 The application of mitochondrial autophagy inhibitors has been pointed to facilitate NLRP3 inflammasome activation.122
Based on the interaction between mitochondrial dysfunction and NLRP3 inflammasome activation, this mechanism can be considered as a potential novel therapeutic target for SIMD. For instance, peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) and Nrf2 are critical factors regulating mitochondrial biogenesis.123 Studies have shown that Nrf2 modulates NLRP3 inflammasome activity through two pathways. First, Nrf2 suppresses NLRP3 inflammasome activation by upregulating the expression of antioxidant genes, thereby reducing the generation of ROS.124 Second, Nrf2 inhibits the activation of the NF-κB signaling pathway, reducing the expression of inflammatory mediators such as caspase-1, IL-1β, and IL-18, further suppressing NLRP3 inflammasome activity. It is worth mentioning cardiolipin. Cardiolipin is a unique phospholipid that does not form bilayers, with a specific structure consisting of two acylated phosphatidyl groups connected by a glycerol bridge.125 It is localized to the inner mitochondrial membrane and redistributes to the outer mitochondrial membrane upon mitochondrial destabilization.126 Given that mitochondria are endosymbionts of early eukaryotic cells and cardiolipin is exclusively found in mitochondria and bacteria, it is hypothesized that cardiolipin may be revealed as an endogenous PAMP during mitochondrial dysfunction and sensed by NLRP3.127 Currently, it is believed that cardiolipin may play a role in the activation of the NLRP3 inflammasome, either by serving as a docking site for inflammasome assembly and subsequent activation on mitochondria, or as a direct activating ligand for NLRP3.127 Furthermore, experimental studies by Shankar S. Iyer et al have shown that under various stress conditions, cardiolipin redistributes to the outer mitochondrial membrane, where it directly binds to the LRR domain of NLRP3, positioning NLRP3 on the mitochondria and activating the NLRP3 inflammasome.127 Nonetheless, the exact mechanism of cardiolipin translocation to the outer mitochondrial membrane and its role in the pro-inflammatory pathway of NLRP3 inflammasome activation remains unclear and requires further investigation.128
The Role of NLRP3 Inflammasome via Exosome in SIMD
Exosomes are extracellular vesicles derived from endosomes, typically ranging in size from 30 to 150 nanometers, making them one of the smallest types of extracellular vesicles, which may contain a diverse array of complex molecules provided by the parent cell, including proteins, lipids, mRNA, miRNA, and DNA.129,130 Unlike other extracellular vesicles, exosomes are formed by the fusion of intracellular multivesicular bodies with the plasma membrane, thereby releasing their contents into the extracellular space. In contrast, other extracellular vesicles are actively released by the cell. Furthermore, exosomes exhibit greater complexity in terms of both molecular weight and the variety of molecules they contain.129 In recent years, exosomes have been recognized for their significant roles in the pathogenesis and progression of various diseases, including neurodegenerative diseases, cancer, liver diseases, and heart failure. Similar to other extracellular vesicles, exosomes selectively capture their “cargo” rather than passively packaging it. The uptake of this cargo is dependent on the type of cell that produces the exosomes.131 Exosomes have increasingly been identified as key carriers of signaling molecules during inflammation, effectively transferring proteins, lipids, and nucleic acids to regulate the metabolic state of target cells in numerous diseases such as cancer, cardiovascular diseases, and neurodegenerative disorders. In the context of inflammasomes, the interaction between exosomes and the NLRP3 inflammasome is considered to play a critical role in the onset and progression of inflammation-related diseases, particularly in systemic inflammatory responses (eg, systemic inflammatory myocardial injury, SIMD). For instance, Xu et al observed that inhibiting miR-484 in an LPS-induced sepsis cardiomyocyte model effectively reduced the formation of NLRP3 inflammasomes, thereby downregulating the expression of pro-inflammatory cytokines (such as TNF-α, IL-1β, and IL-6), alleviating cardiomyocyte apoptosis, and promoting cardiomyocyte viability recovery.132 Similarly, miR-495 has been shown to improve damage and inflammation in cardiac microvascular endothelial cells by inhibiting the NLRP3 inflammasome signaling pathway.133 Liu et al’s research demonstrated that miR-129-5p, by targeting TRPM7 and inhibiting NLRP3 inflammasome activation, alleviated cardiomyocyte injury.134 Further molecular studies have suggested that miRNAs may regulate the transcriptional expression of NLRP3 by directly binding to its 3’ untranslated region (UTR). For example, Li et al discovered that in sepsis cardiomyopathy patients and in septic cardiomyocyte injury models, long non-coding RNA ZFAS1, acting as a competing endogenous RNA (ceRNA), indirectly modulates the expression of SESN2, thereby reducing sepsis-induced myocardial cell damage.135
Current literature suggests that exosome-mediated interactions with the NLRP3 inflammasome play a significant role in the pathophysiology of SIMD, highlighting their potential as promising therapeutic targets for SIMD. However, the precise molecular mechanisms governing these interactions remain poorly understood. Consequently, further research is warranted to elucidate the underlying mechanisms and their implications for future therapeutic strategies.
The Role of NLRP3 Inflammasome via ER Stress in SIMD
ER stress is a cellular response activated to cope with conditions such as the accumulation of misfolded and unfolded proteins within the ER lumen and dysregulation of calcium homeostasis.136 This response involves pathways such as the unfolded protein response (UPR), the ER overload response, and caspase-12 mediated apoptosis.136 Physiological UPR refers to the process by which cells manage mild ER stress under normal physiological conditions.137 During this process, the ER senses the accumulation of misfolded or unfolded proteins and activates a series of signaling pathways to initiate the stress response.137 The goal of this response is to restore ER function, promote proper protein folding, and adjust protein synthesis to maintain normal cellular function.137 This stress response is typically reversible and helps cells cope with transient stress. However, when the stress load becomes overwhelming and intracellular homeostasis is disrupted, physiological UPR may no longer maintain normal cellular function.137,138 Excessive ER stress triggers inflammatory signals within the cell, activating the NLRP3 inflammasome and leading to widespread inflammatory responses137,138(Figure 4).
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Figure 4 The Role of NLRP3 Inflammasome via ER stress in SIMD. Under normal conditions, GRP78 binds to and inhibits three transmembrane UPR signaling factors localized in the ER: IRE1, ATF6, and PERK. However, during ER stress, the UPR is activated through these three ER sensors—PERK, IRE1, and ATF6—which subsequently trigger the activation of the NLRP3 inflammasome. Excessive ROS production can induce ER stress. Moreover, ER stress activates PERK and IRE1, which promote the expression of TXNIP, thereby activating the NLRP3 inflammasome.
Abbreviations: TXNIP, Thioredoxin-interacting protein; XBP1, X-box Binding Protein 1; sXBP1, spliced XBP1; ATF4, Activating transcription factor 4; ATF6, Activating Transcription Factor 6; DDIT3, DNA Damage-Inducible Transcript 3; EIF2α, Eukaryotic Initiation Factor 2α; GRP78, Glucose-Regulated Protein 78.
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The UPR is a cellular mechanism that helps mitigate ER stress by enhancing the ER’s protein-folding capacity, repairing mildly misfolded proteins, and ultimately clearing irreversibly misfolded proteins.139 The UPR involves multiple signaling pathways aimed at promoting the proper folding of proteins in the ER, reducing overall protein synthesis, and activating ER-associated degradation (ERAD) pathways to remove accumulated misfolded proteins. In cases of excessive or unresolved ER stress, the UPR also triggers apoptotic cascades. A key protein in the UPR process is the chaperone GRP78, which regulates protein synthesis, folding, and assembly.140 GRP78 acts not only as a sensor of misfolded proteins but also as an initiator of UPR signaling cascades.141 Under normal conditions, GRP78 binds to and inhibits the activity of three ER-resident transmembrane UPR signaling proteins: inositol-requiring enzyme 1 (IRE1), activating transcription factor 6 (ATF6), and protein kinase RNA-like endoplasmic reticulum kinase (PERK). However, upon the accumulation of misfolded proteins during ER stress, GRP78 recognizes the error and releases these signaling factors, allowing them to bind to misfolded proteins, thus activating UPR signaling and downstream cascades.142 These factors cooperate to promote correct protein folding and clear misfolded proteins. Although this is the classical mechanism of recognizing misfolded proteins in the ER, increasing evidence suggests that misfolded proteins may also directly interact with IRE1 or PERK, initiating the UPR.143,144 Moreover despite being a protective response, in cases of severe and prolonged ER stress, the UPR can lead to cellular toxicity.145
Recent studies have revealed a close relationship between ER stress, UPR, and inflammatory responses.146,147 A number of investigations have shown that sepsis and sepsis-induced cardiomyopathy are closely linked to excessive ROS production. Thus, enhancing cellular antioxidant defenses or promoting ROS clearance may help restore redox balance and improve pathological conditions in various disease models.148 Excessive ROS generation can induce ER stress, referred to as ROS-induced ER stress,149 which is one of the mechanisms of cell apoptosis mediated by ROS. ER stress -induced apoptosis in cardiomyocytes has been recognized as a primary mechanism of myocardial injury.150,151 Further research has also highlighted the role of the NLRP3 inflammasome in the development of various inflammatory diseases, including sepsis and sepsis-induced cardiomyopathy. In this context, the interplay between ER stress and the NLRP3 inflammasome and their potential synergistic roles in the pathogenesis of sepsis and SIMD have become important areas of investigation.
The UPR is the most significant and widely studied pathway for ER stress. In mammals, UPRs are mediated by three ER stress sensors: IRE1, PERK, and ATF6. Research suggests that ER stress serves as an endogenous trigger for the NLRP3 inflammasome.152 These three ER stress sensors can activate the NLRP3 inflammasome through complex mechanisms, leading to cellular damage, often involving the TXNIP/NLRP3 pathway.
Upon activation, IRE1α phosphorylates and dimerizes, activating its RNase domain and catalyzing the removal of 26 nucleotides from the XBP1 mRNA sequence, allowing its translation.153 X-box binding protein 1 (XBP1) is a key regulator of genes involved in ER-associated degradation (ERAD) and protein folding.153 Additionally, IRE1α activation triggers the TNF receptor-associated factor 2 (TRAF2) and c-Jun N-terminal kinase (JNK) signaling modules, which initiate inflammatory responses.154 Studies indicate that IRE1α overexpression due to ER stress activates XBP1s or stimulates JNK phosphorylation through ASK1, which in turn activates C/EBP homologous protein (CHOP), inducing TXNIP overexpression. TXNIP is then translocated to the mitochondria, where it forms a complex with TRX2.103 This process promotes ROS accumulation and the oxidation of TRX2, releasing TXNIP, which subsequently activates the NLRP3 inflammasome through interaction with NLRP3, triggering an inflammatory response.104 Second, PERK, a type I transmembrane kinase, is activated under ER stress. Its activation induces the phosphorylation of the eukaryotic initiation factor 2α (eIF2α) subunit, which inhibits protein synthesis.155 Under ER stress, sustained phosphorylation of eIF2α induces ATF4 expression, leading to the activation of CHOP and the subsequent activation of the TXNIP/NLRP3 inflammasome.155,156 Third, upon activation of the UPR, ATF6 directly encodes XBP1, which enhances CHOP expression.157 Similar to the IRE1α and PERK pathways, overexpression of CHOP leads to TXNIP overexpression and activation of the NLRP3 inflammasome.101 Liu et al found that silencing TXNIP inhibited NLRP3 inflammasome activation and reduced cardiomyocyte apoptosis induced by ischemia/reperfusion.158 Similarly, studies in a SIMD rat model observed increased expression of TXNIP, NLRP3, IL-1β, and IL-18.106
In addition to the TXNIP/NLRP3 pathway, Yang et al found that inhibiting the IRE1α pathway alleviates NLRP3 activity and IL-1β production, thereby reducing inflammation and ROS in sepsis and organ injury models.152 Activated IRE1 also triggers mitochondrial damage through caspase-2 and BID, leading to NLRP3 inflammasome activation.159 The ER is a calcium ion reservoir, and during ER stress, an imbalance in the ER leads to excessive calcium influx into the mitochondria through the ER-mitochondria contact points (MAM), resulting in mitochondrial calcium overload and damage.160 This overload causes excessive mtROS production, mitochondrial DNA damage, and cardiolipin damage, all of which activate the NLRP3 inflammasome.44,128,161 Consequently, calcium dysregulation serves as a secondary effect of ER membrane instability and subsequent inflammatory responses, rather than directly inducing membrane instability.162 Calcium changes are critical signaling events in cellular stress responses, indirectly promoting NLRP3 inflammasome activation.162 In experimental models of various inflammatory diseases, including sepsis, reducing ER stress and the interaction between ER stress and the NLRP3 inflammasome through pharmacological or gene therapy strategies has successfully alleviated pathology associated with inflammation.118,163 Melatonin and liver X receptor agonists have been shown to attenuate sepsis-induced myocardial dysfunction by inhibiting ER stress.164,165
The aforementioned findings highlight the critical role of the interaction between ER stress and the NLRP3 inflammasome in the pathogenesis of septic myocardial injury. However, the precise mechanisms by which ER stress triggers the activation and inflammatory functions of the NLRP3 inflammasome remain unclear. To date, there has been no in-depth investigation directly exploring the role of ERS markers, such as GRP78, IRE1α, PERK, or ATF6α, within the NLRP3 inflammasome signaling cascade. Future research is required to further elucidate the specific molecular mechanisms underlying the interplay between ER stress and the NLRP3 inflammasome in septic cardiomyopathy. This will be crucial for the development of targeted therapeutic strategies for SIMD.
Targeted Therapy for SIMD Focusing on the NLRP3 Inflammasome
As previously highlighted, the activation of the NLRP3 inflammasome is a critical factor in the pathogenesis of sepsis and SIMD, contributing to disease progression through mechanisms such as pyroptosis, ROS, mitochondrial dysfunction, exosome release, and ERS stress. These interconnected pathological processes play a significant role in the onset and advancement of SIMD. Consequently, targeting the NLRP3 inflammasome has emerged as a promising therapeutic strategy for both the prevention and treatment of SIMD (Table 1). For instance, melatonin has been shown to modulate the Nrf2 signaling pathway, thereby inhibiting NLRP3 inflammasome activation and mitigating myocardial injury induced by sepsis.80 In a similar vein, geniposide (GE) exerts its effects by activating AMPKα, which suppresses the accumulation of myocardial ROS and prevents NLRP3 inflammasome-mediated cardiomyocyte apoptosis, leading to improved outcomes in SIMD.113 Given the pivotal role of NLRP3 inflammasome activation and its involvement in multiple pathological processes, including pyroptosis and oxidative stress, targeting the NLRP3 inflammasome represents a promising therapeutic approach and an important area for future research in the treatment of SIMD.
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Table 1 Therapeutic Strategies Based on NLRP3 Inflammasome in SIMD
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Limitation
In this review, while we have thoroughly explored the role of the NLRP3 inflammasome in septic cardiomyopathy, several limitations remain to be addressed. First, our research lacks clinical trial data, and as a result, our conclusions are primarily based on animal models and in vitro experiments. Although these experimental findings provide important insights into the mechanisms of the NLRP3 inflammasome, their validation in clinical settings remains insufficient. Therefore, future studies should design and conduct more clinical trials to verify the theories and discoveries we have proposed. Secondly, our research identified the involvement of the NLRP3 inflammasome in multiple intracellular signaling pathways, including mitochondrial dysfunction, oxidative stress, and endoplasmic reticulum stress. These pathways may exhibit overlapping and interactive effects to some extent. However, the current study has not fully elucidated the precise relationships and interactions between these pathways. Therefore, future research needs to further investigate the cross-talk between these signaling pathways in order to gain a more comprehensive understanding of the multifaceted role of the NLRP3 inflammasome in septic cardiomyopathy. In conclusion, although this study provides new insights into the role of the NLRP3 inflammasome in septic cardiomyopathy, we acknowledge the limitations of the current research. We look forward to future studies that will complement and refine these findings through more clinical investigations and in-depth mechanistic studies.
Conclusion
In summary, we explored the activation of the NLRP3 inflammasome as a central mechanism in the pathogenesis of SIMD, with a particular focus on its interactions with various pathological processes, including pyroptosis, oxidative stress, mitochondrial damage, exosome release, and endoplasmic reticulum stress. The findings suggest that the NLRP3 inflammasome may serve as a potential therapeutic target or a preventive approach for SIMD. While significant progress has been made in the development of NLRP3 inflammasome-targeted therapies, existing research has predominantly been confined to cell lines and animal models, with a lack of clinical evidence to support these findings. Therefore, there is an urgent need for more clinical studies focusing on the application of NLRP3 inflammasome-based therapies.
Acknowledgments
The authors thank Department of Emergency Medical, General Hospital of Ningxia Medical University, Department of Nuclear Medical, General Hospital of Ningxia Medical University and Department of Pediatrics Emergency Medical, General Hospital of Ningxia Medical University for supporting this work.
Author Contributions
All authors made a significant contribution to the work reported, whether that is in the conception, study design, execution, acquisition of data, analysis and interpretation, or in all these areas; took part in drafting, revising or critically reviewing the article; gave final approval of the version to be published; have agreed on the journal to which the article has been submitted; and agree to be accountable for all aspects of the work.
Disclosure
All authors declare that there is no conflict of interest in this work.
References
1. American College of Chest Physicians/Society of Critical Care Medicine Consensus Conference. Definitions for sepsis and organ failure and guidelines for the use of innovative therapies in sepsis. Crit Care Med. 1992;20:864–874. doi:10.1097/00003246-199206000-00025
2. Singer M, Deutschman CS, Seymour CW, et al. The third international consensus definitions for sepsis and septic shock (Sepsis-3). JAMA. 2016;315(8):801–810. doi:10.1001/jama.2016.0287
3. Rudd KE, Johnson SC, Agesa KM. Global, regional, and national sepsis incidence and mortality, 1990-2017: analysis for the global burden of disease study. Lancet. 2020;395:200–211. doi:10.1016/S0140-6736(19)32989-7
4. Sakr Y, Jaschinski U, Wittebole X. Sepsis in intensive care unit patients: worldwide data from the intensive care over nations audit. Open Forum Infect Dis. 2018;5(12):ofy313. doi:10.1093/ofid/ofy313
5. Rhee C, Dantes R, Epstein L, et al. Incidence and trends of sepsis in US hospitals using clinical vs claims data, 2009-2014. JAMA. 2017;318:1241–1249. doi:10.1001/jama.2017.13836
6. Xie J, Wang H, Kang Y. The epidemiology of sepsis in Chinese ICUs: a national cross-sectional survey. Crit Care Med. 2020;48:e209–e218. doi:10.1097/CCM.0000000000004155
7. Zeng X-M, Liu D-H, Han Y, Huang Z-Q, Zhang J-W, Huang Q. Assessment of inflammatory markers and mitochondrial factors in a rat model of sepsis-induced myocardial dysfunction. Am J Transl Res. 2020;12:901–911.
8. Hollenberg SM, Singer M. Pathophysiology of sepsis-induced cardiomyopathy. Nat Rev Cardiol. 2021;18:424–434. doi:10.1038/s41569-020-00492-2
9. Frencken JF, Donker DW, Spitoni C, et al. Myocardial injury in patients with sepsis and its association with long-term outcome. Circ Cardiovasc Qual Outcomes. 2018;11(2):e004040. doi:10.1161/CIRCOUTCOMES.117.004040
10. Bessière F, Khenifer S, Dubourg J, Durieu I, Lega J-C. Prognostic value of troponins in sepsis: a meta-analysis. Intensive Care Med. 2013;39:1181–1189. doi:10.1007/s00134-013-2902-3
11. Sanfilippo F, Corredor C, Fletcher N. Left ventricular systolic function evaluated by strain echocardiography and relationship with mortality in patients with severe sepsis or septic shock: a systematic review and meta-analysis. Crit Care. 2018;22(1):183. doi:10.1186/s13054-018-2113-y
12. Martin L, Derwall M, Al Zoubi S, et al. the septic heart: current understanding of molecular mechanisms and clinical implications. Chest. 2019;155(2):427–437. doi:10.1016/j.chest.2018.08.1037
13. Feng D, Guo L, Liu J, et al. DDX3X deficiency alleviates LPS-induced H9c2 cardiomyocytes pyroptosis by suppressing activation of NLRP3 inflammasome. Exp Ther Med. 2021;22:1389. doi:10.3892/etm.2021.10825
14. Ruan W, Ji X, Qin Y, et al. Harmine alleviated sepsis-induced cardiac dysfunction by modulating macrophage polarization via the STAT/MAPK/NF-κB pathway. Front Cell Dev Biol. 2021;9:792257. doi:10.3389/fcell.2021.792257
15. Ehrman RR, Sullivan AN, Favot MJ. Pathophysiology, echocardiographic evaluation, biomarker findings, and prognostic implications of septic cardiomyopathy: a review of the literature. Crit Care. 2018;22(1):112. doi:10.1186/s13054-018-2043-8
16. Song C, Zhang Y, Pei Q, et al. HSP70 alleviates sepsis-induced cardiomyopathy by attenuating mitochondrial dysfunction-initiated NLRP3 inflammasome-mediated pyroptosis in cardiomyocytes. Burns Trauma. 2022;10:tkac043. doi:10.1093/burnst/tkac043
17. Conway-Morris A, Wilson J, Shankar-Hari M. Immune activation in sepsis. Crit Care Clin. 2018;34:29–42. doi:10.1016/j.ccc.2017.08.002
18. Rivera A, Siracusa MC, Yap GS, Gause WC. Innate cell communication kick-starts pathogen-specific immunity. Nat Immunol. 2016;17:356–363. doi:10.1038/ni.3375
19. Chen H, Mao X, Meng X, et al. Hydrogen alleviates mitochondrial dysfunction and organ damage via autophagy‑mediated NLRP3 inflammasome inactivation in sepsis. Int J Mol Med. 2019;44:1309–1324. doi:10.3892/ijmm.2019.4311
20. Fusco R, Siracusa R, Genovese T, Cuzzocrea S, Di Paola R. Focus on the role of NLRP3 inflammasome in diseases. Int J Mol Sci. 2020;21:4223. doi:10.3390/ijms21124223
21. Zhang B, Liu Y, Sui Y-B, et al. Cortistatin inhibits NLRP3 inflammasome activation of cardiac fibroblasts during sepsis. J Card Fail. 2015;21(5):426–433. doi:10.1016/j.cardfail.2015.01.002
22. Qiu J, Xiao X, Gao X, Zhang Y. Ulinastatin protects against sepsis‑induced myocardial injury by inhibiting NLRP3 inflammasome activation. Mol Med Rep. 2021;24:730. doi:10.3892/mmr.2021.12369
23. Luo J, Zhou Y, Wang M, Zhang J, Jiang E. Inflammasomes: potential therapeutic targets in hematopoietic stem cell transplantation. Cell Commun Signal. 2024;22:596. doi:10.1186/s12964-024-01974-3
24. Li X, Hu X, You H, Zheng K, Tang R, Kong F. Regulation of pattern recognition receptor signaling by palmitoylation. iScience. 2025;28(2):111667. doi:10.1016/j.isci.2024.111667
25. Hromić-Jahjefendić A, Aljabali AAA. Analysis of the immune response in COVID-19. Prog Mol Biol Transl Sci. 2025;213:31–71.
26. Liao Y, Liu K, Zhu L. Emerging roles of inflammasomes in cardiovascular diseases. Front Immunol. 2022;13:834289. doi:10.3389/fimmu.2022.834289
27. Calabrese L, Fiocco Z, Mellett M, et al. Role of the NLRP1 inflammasome in skin cancer and inflammatory skin diseases. Br J Dermatol. 2024;190(3):305–315. doi:10.1093/bjd/ljad421
28. Du L, Wang X, Chen S, Guo X. The AIM2 inflammasome: a novel biomarker and target in cardiovascular disease. Pharmacol Res. 2022;186:106533. doi:10.1016/j.phrs.2022.106533
29. Fan X-Y, Liao X-Q, Wang Z-Y, Zhao -J-J, Hu Z-X. Mechanisms of NLRP3 inflammasome-mediated pyroptosis in chronic heart failure and research progress in traditional Chinese medicine. Zhongguo Zhong Yao Za Zhi. 2024;49:2106–2116. doi:10.19540/j.cnki.cjcmm.20231212.708
30. Jin Y, Fleishman J, Ma Y. NLRP3 inflammasome targeting offers a novel therapeutic paradigm for sepsis-induced myocardial injury. DDDT. 2025;19:1025–1041. doi:10.2147/DDDT.S506537
31. Swanson KV, Deng M, Ting JP-Y. The NLRP3 inflammasome: molecular activation and regulation to therapeutics. Nat Rev Immunol. 2019;19:477–489. doi:10.1038/s41577-019-0165-0
32. O’Brien WT, Pham L, Symons GF, et al. The NLRP3 inflammasome in traumatic brain injury: potential as a biomarker and therapeutic target. J Neuroinflammation. 2020;17(1):104. doi:10.1186/s12974-020-01778-5
33. Muñoz-Planillo R, Kuffa P, Martínez-Colón G, Smith B, Rajendiran T, Núñez G. K+ efflux is the common trigger of NLRP3 inflammasome activation by bacterial toxins and particulate matter. Immunity. 2013;38(6):1142–1153. doi:10.1016/j.immuni.2013.05.016
34. He Y, Hara H, Núñez G. Mechanism and regulation of NLRP3 inflammasome activation. Trends Biochem Sci. 2016;41:1012–1021. doi:10.1016/j.tibs.2016.09.002
35. Wu J, Lv T, Liu Y, et al. The role of quercetin in NLRP3-associated inflammation. Inflammopharmacology. 2024;32(6):3585–610. doi:10.1007/s10787-024-01566-0
36. Shen S, Wang Z, Sun H, Ma L. Role of NLRP3 inflammasome in myocardial ischemia-reperfusion injury and ventricular remodeling. Med Sci Monit. 2022;28:e934255. doi:10.12659/MSM.934255
37. Zhang W-J, Li K-Y, Lan Y, Zeng H-Y, Chen S-Q, Wang H. NLRP3 inflammasome: a key contributor to the inflammation formation. Food Chem Toxicol. 2023;174:113683. doi:10.1016/j.fct.2023.113683
38. Lobanova E, Zhang YP, Emin D. ASC specks as a single-molecule fluid biomarker of inflammation in neurodegenerative diseases. Nat Commun. 2024;15(1):9690. doi:10.1038/s41467-024-53547-0
39. Napodano C, Carnazzo V, Basile V, et al. NLRP3 inflammasome involvement in heart, liver, and lung diseases-A Lesson from cytokine storm syndrome. Int J Mol Sci. 2023;24:16556. doi:10.3390/ijms242316556
40. Lu H-F, Zhou Y-C, Hu T-Y. Unraveling the role of NLRP3 inflammasome in allergic inflammation: implications for novel therapies. Front Immunol. 2024;15:1435892. doi:10.3389/fimmu.2024.1435892
41. Gupta S, Cassel SL, Sutterwala FS, Dagvadorj J. Regulation of the NLRP3 inflammasome by autophagy and mitophagy. Immunol Rev. 2025;329(1):e13410. doi:10.1111/imr.13410
42. Danielski LG, Giustina AD, Bonfante S, Barichello T, Petronilho F. The NLRP3 inflammasome and its role in sepsis development. Inflammation. 2020;43:24–31. doi:10.1007/s10753-019-01124-9
43. Gong T, Jiang W, Zhou R. Control of inflammasome activation by phosphorylation. Trends Biochem Sci. 2018;43:685–699. doi:10.1016/j.tibs.2018.06.008
44. Gong T, Yang Y, Jin T, Jiang W, Zhou R. Orchestration of NLRP3 inflammasome activation by ion fluxes. Trend Immunol. 2018;39:393–406. doi:10.1016/j.it.2018.01.009
45. Zhang J, Zhang R, Li W, Ma X-C, Qiu F, Sun C-P. IκB kinase β (IKKβ): structure, transduction mechanism, biological function, and discovery of its inhibitors. Int J Biol Sci. 2023;19(13):4181–4203. doi:10.7150/ijbs.85158
46. Ibrahim A, Saleem N, Naseer F, et al. From cytokines to chemokines: understanding inflammatory signaling in bacterial meningitis. Mol Immunol. 2024;173:117–126. doi:10.1016/j.molimm.2024.07.004
47. Song N, Liu Z-S, Xue W. NLRP3 phosphorylation is an essential priming event for inflammasome activation. Molecular Cell. 2017;68:185–197.e6. doi:10.1016/j.molcel.2017.08.017
48. Py BF, Kim M-S, Vakifahmetoglu-Norberg H, Yuan J. Deubiquitination of NLRP3 by BRCC3 critically regulates inflammasome activity. Molecular Cell. 2013;49:331–338. doi:10.1016/j.molcel.2012.11.009
49. Mishra A, Behura A, Kumar A, et al. P2X7 receptor in multifaceted cellular signalling and its relevance as a potential therapeutic target in different diseases. Eur. J. Pharmacol. 2021;906:174235. doi:10.1016/j.ejphar.2021.174235
50. Jiang H, Gong T, Zhou R. The strategies of targeting the NLRP3 inflammasome to treat inflammatory diseases. Adv Immunol. 2020;145:55–93.
51. Zhong Z, Liang S, Sanchez-Lopez E, et al. New mitochondrial DNA synthesis enables NLRP3 inflammasome activation. Nature. 2018;560:198–203. doi:10.1038/s41586-018-0372-z
52. Zhong Z, Umemura A, Sanchez-Lopez E, et al. NF-κB restricts inflammasome activation via elimination of damaged mitochondria. Cell. 2016;164:896–910. doi:10.1016/j.cell.2015.12.057
53. Shimada K, Crother T, Karlin J, et al. Oxidized mitochondrial DNA activates the NLRP3 inflammasome during apoptosis. Immunity. 2012;36:401–414.
54. Halle A, Hornung V, Petzold GC. The NALP3 inflammasome is involved in the innate immune response to amyloid-β. Nat Immunol. 2008;9:857–865. doi:10.1038/ni.1636
55. Hornung V, Bauernfeind F, Halle A. Silica crystals and aluminum salts activate the NALP3 inflammasome through phagosomal destabilization. Nat Immunol. 2008;9:847–856. doi:10.1038/ni.1631
56. Tang D, Kang R, Berghe TV, Vandenabeele P, Kroemer G. The molecular machinery of regulated cell death. Cell Res. 2019;29:347–364. doi:10.1038/s41422-019-0164-5
57. Cookson BT, Brennan MA. Pro-inflammatory programmed cell death. Trend Microbiol. 2001;9:113–114. doi:10.1016/S0966-842X(00)01936-3
58. Galluzzi L, Vitale I, Aaronson SA, et al. Molecular mechanisms of cell death: recommendations of the nomenclature committee on cell death 2018. Cell Death Differ. 2018;25:486–541. doi:10.1038/s41418-017-0012-4
59. Kalbitz M, Fattahi F, Grailer JJ, et al. Complement‐induced activation of the cardiac NLRP3 inflammasome in sepsis. FASEB J. 2016;30:3997–4006. doi:10.1096/fj.201600728R
60. Kayagaki N, Stowe IB, Lee BL. Caspase-11 cleaves gasdermin D for non-canonical inflammasome signalling. Nature. 2015;526:666–671. doi:10.1038/nature15541
61. Ding J, Wang K, Liu W, et al. Pore-forming activity and structural autoinhibition of the gasdermin family. Nature. 2016;535:111–116. doi:10.1038/nature18590
62. Barnett KC, Ting JP-Y. Mitochondrial GSDMD pores DAMPen pyroptosis. Immunity. 2020;52:424–426. doi:10.1016/j.immuni.2020.02.012
63. Xiaodong L, Xuejun X. GSDMD-mediated pyroptosis in retinal vascular inflammatory diseases: a review. Int Ophthalmol. 2023;43:1405–1411. doi:10.1007/s10792-022-02506-z
64. Li Z, Ji S, Jiang M-L, Xu Y, Zhang C-J. The regulation and modification of GSDMD signaling in diseases. Front Immunol. 2022;13:893912. doi:10.3389/fimmu.2022.893912
65. Jin X, Dong X, Sun Y, Liu Z, Liu L, Gu H. Dietary fatty acid regulation of the NLRP3 inflammasome via the TLR4/NF-κB signaling pathway affects chondrocyte pyroptosis. Oxid Med Cell Longev. 2022;2022(2022):3711371. doi:10.1155/2022/3711371
66. Kayagaki N, Lee BL, Stowe IB, et al. IRF2 transcriptionally induces GSDMD expression for pyroptosis. Sci Signal. 2019;12:eaax4917. doi:10.1126/scisignal.aax4917
67. Benaoudia S, Martin A, Puig Gamez M, et al. A genome‐wide screen identifies IRF2 as a key regulator of caspase‐4 in human cells. EMBO Rep. 2019;20:e48235. doi:10.15252/embr.201948235
68. Liu X, Zhang Z, Ruan J. Inflammasome-activated gasdermin D causes pyroptosis by forming membrane pores. Nature. 2016;535(7610):153–158. doi:10.1038/nature18629
69. Fisher CJ, Slotman GJ, Opal SM, et al. Initial evaluation of human recombinant interleukin-1 receptor antagonist in the treatment of sepsis syndrome: a randomized, open-label, placebo-controlled multicenter trial. Crit Care Med. 1994;22:12–21. doi:10.1097/00003246-199401000-00008
70. Van Tassell BW, Raleigh JMV, Abbate A. Targeting interleukin-1 in heart failure and inflammatory heart disease. Curr Heart Fail Rep. 2015;12:33–41. doi:10.1007/s11897-014-0231-7
71. Busch K, Kny M, Huang N. Inhibition of the NLRP3/IL-1β axis protects against sepsis-induced cardiomyopathy. J Cachexia, Sarcopenia Muscle. 2021;12(6):1653–1668. doi:10.1002/jcsm.12763
72. Wu D, Shi L, Li P. Intermedin1-53 protects cardiac fibroblasts by inhibiting NLRP3 inflammasome activation during sepsis. Inflammation. 2018;41:505–514. doi:10.1007/s10753-017-0706-2
73. Huang W, Wang X, Xie F, Zhang H, Liu D. Serum NLRP3: a biomarker for identifying high-risk septic patients. Cytokine. 2022;149:155725. doi:10.1016/j.cyto.2021.155725
74. Li N, Zhou H, Wu H. STING-IRF3 contributes to lipopolysaccharide-induced cardiac dysfunction, inflammation, apoptosis and pyroptosis by activating NLRP3. Redox Biol. 2019;24:101215.
75. Yang Z, Pan X, Wu X. TREM −1 induces pyroptosis in cardiomyocytes by activating NLRP3 inflammasome through the SMC4 / NEMO pathway. FEBS J. 2023;290:1549–1562. doi:10.1111/febs.16644
76. Wen R, Liu Y-P, Tong -X-X, Zhang T-N, Yang N. Molecular mechanisms and functions of pyroptosis in sepsis and sepsis-associated organ dysfunction. Front Cell Infect Microbiol. 2022;12:962139. doi:10.3389/fcimb.2022.962139
77. Chen S, Tang C, Ding H. Maf1 Ameliorates Sepsis-Associated Encephalopathy by Suppressing the NF-kB/NLRP3 Inflammasome Signaling Pathway. Front Immunol. 2020;11:594071. doi:10.3389/fimmu.2020.594071
78. Pu Q, Gan C, Li R. Atg7 deficiency intensifies inflammasome activation and pyroptosis in Pseudomonas sepsis. J Immunol. 2017;198:3205–3213. doi:10.4049/jimmunol.1601196
79. Li Z, Liu T, Feng Y, et al. PPARγ alleviates sepsis-induced liver injury by inhibiting hepatocyte pyroptosis via inhibition of the ROS/TXNIP/NLRP3 signaling pathway. Oxid Med Cell Longev. 2022;2022:1–15.
80. Rahim I, Sayed RK, Fernández-Ortiz M, et al. Melatonin alleviates sepsis-induced heart injury through activating the Nrf2 pathway and inhibiting the NLRP3 inflammasome. Naunyn Schmiedebergs Arch Pharmacol. 2021;394(2):261–277. doi:10.1007/s00210-020-01972-5
81. Zhao S, Chen F, Yin Q, Wang D, Han W, Zhang Y. Reactive oxygen species interact with NLRP3 inflammasomes and are involved in the inflammation of sepsis: from mechanism to treatment of progression. Front Physiol. 2020;11:571810. doi:10.3389/fphys.2020.571810
82. Fu C, Weng S, Liu D, et al. Review on the role of mitochondrial dysfunction in septic encephalopathy. Cell Biochem Biophys. 2024;83(1):135–145. doi:10.1007/s12013-024-01493-5
83. Ray PD, Huang B-W, Tsuji Y. Reactive oxygen species (ROS) homeostasis and redox regulation in cellular signaling. Cell Signal. 2012;24:981–990. doi:10.1016/j.cellsig.2012.01.008
84. Fang FC. Antimicrobial actions of reactive oxygen species. mBio. 2011;2:e00141–11. doi:10.1128/mBio.00141-11
85. Rauf A, Khalil AA, Awadallah S, et al. Reactive oxygen species in biological systems: pathways, associated diseases, and potential inhibitors—A review. Food sci nutr. 2024;12(2):675–693. doi:10.1002/fsn3.3784
86. Sahoo DK, Wong D, Patani A, et al. Exploring the role of antioxidants in sepsis-associated oxidative stress: a comprehensive review. Front Cell Infect Microbiol. 2024;14:1348713. doi:10.3389/fcimb.2024.1348713
87. Zhao Q, Liu G, Ding Q, et al. The ROS/TXNIP/NLRP3 pathway mediates LPS-induced microglial inflammatory response. Cytokine. 2024;181:156677. doi:10.1016/j.cyto.2024.156677
88. Pétrilli V, Papin S, Dostert C, et al. Activation of the NALP3 inflammasome is triggered by low intracellular potassium concentration. Cell Death Differ. 2007;14(9):1583–1589. doi:10.1038/sj.cdd.4402195
89. Zhou T, Qian H, Zheng N, Lu Q, Han Y. GYY4137 ameliorates sepsis-induced cardiomyopathy via NLRP3 pathway. Biochim Biophys Acta Mol Basis Dis. 2022;1868:166497. doi:10.1016/j.bbadis.2022.166497
90. West AP, Brodsky IE, Rahner C. TLR signalling augments macrophage bactericidal activity through mitochondrial ROS. Nature. 2011;472(7344):476–480. doi:10.1038/nature09973
91. Liu Z, Pan H, Zhang Y. Ginsenoside-Rg1 attenuates sepsis-induced cardiac dysfunction by modulating mitochondrial damage via the P2X7 receptor-mediated Akt/GSK-3β signaling pathway. J Biochem Mol Toxicol. 2022;36(1):e22885. doi:10.1002/jbt.22885
92. Arulkumaran N, Sixma ML, Pollen S, et al. P2X 7 receptor antagonism ameliorates renal dysfunction in a rat model of sepsis. Physiol Rep. 2018;6:e13622. doi:10.14814/phy2.13622
93. Kowaltowski AJ, de Souza-Pinto NC, Castilho RF, Vercesi AE. Mitochondria and reactive oxygen species. Free Radic Biol Med. 2009;47:333–343. doi:10.1016/j.freeradbiomed.2009.05.004
94. Tschopp J, Schroder K. NLRP3 inflammasome activation: the convergence of multiple signalling pathways on ROS production? Nat Rev Immunol. 2010;10:210–215. doi:10.1038/nri2725
95. Spindel ON, World C, Berk BC. Thioredoxin interacting protein: redox dependent and independent regulatory mechanisms. Antioxid Redox Signal. 2012;16:587–596. doi:10.1089/ars.2011.4137
96. Yoshihara E, Masaki S, Matsuo Y, Chen Z, Tian H, Yodoi J. Thioredoxin/Txnip: redoxisome, as a redox switch for the pathogenesis of diseases. Front Immunol. 2014;4:514. doi:10.3389/fimmu.2013.00514
97. Gao P, He -F-F, Tang H. NADPH oxidase-induced NALP3 inflammasome activation is driven by thioredoxin-interacting protein which contributes to podocyte injury in hyperglycemia. J Diabetes Res. 2015;2015(2015):504761. doi:10.1155/2015/504761
98. He L, He T, Farrar S, et al. Antioxidants maintain cellular redox homeostasis by elimination of reactive oxygen species. Cell Physiol Biochem. 2017;44(2):532–553. doi:10.1159/000485089
99. Saxena G, Chen J, Shalev A. Intracellular shuttling and mitochondrial function of thioredoxin-interacting protein. J Biol Chem. 2010;285(6):3997–4005. doi:10.1074/jbc.M109.034421
100. Cao X, He W, Pang Y, Cao Y, Qin A. Redox-dependent and independent effects of thioredoxin interacting protein. Biol Chem. 2020;401:1215–1231.
101. Park S-J, Kim Y, Li C. Blocking CHOP-dependent TXNIP shuttling to mitochondria attenuates albuminuria and mitigates kidney injury in nephrotic syndrome. Proc Natl Acad Sci U S A. 2022;119(35):e2116505119. doi:10.1073/pnas.2116505119
102. Luo B, Huang F, Liu Y, et al. NLRP3 inflammasome as a molecular marker in diabetic cardiomyopathy. Front Physiol. 2017;8:519. doi:10.3389/fphys.2017.00519
103. Zhou R, Tardivel A, Thorens B, Choi I, Tschopp J. Thioredoxin-interacting protein links oxidative stress to inflammasome activation. Nat Immunol. 2010;11:136–140. doi:10.1038/ni.1831
104. Panse M, Kluth O, Lorza-Gil E, et al. Palmitate and insulin counteract glucose-induced thioredoxin interacting protein (TXNIP) expression in insulin secreting cells via distinct mechanisms. PLoS One. 2018;13:e0198016.
105. Choi E-H, Park S-J. TXNIP: a key protein in the cellular stress response pathway and a potential therapeutic target. Exp Mol Med. 2023;55:1348–1356. doi:10.1038/s12276-023-01019-8
106. Yang C, Xia W, Liu X, Lin J, Wu A. Role of TXNIP/NLRP3 in sepsis-induced myocardial dysfunction. Int J Mol Med. 2019;44:417–426.
107. Cortés-Rojo C, Rodríguez-Orozco AR. Importance of oxidative damage on the electron transport chain for the rational use of mitochondria-targeted antioxidants. Mini Rev Med Chem. 2011;11:625–632. doi:10.2174/138955711795906879
108. Guo C, Sun L, Chen X, Zhang D. Oxidative stress, mitochondrial damage and neurodegenerative diseases. Neural Regen Res. 2013;8:2003–2014. doi:10.3969/j.issn.1673-5374.2013.21.009
109. Dominguini D, Michels M, Wessler LB, Streck EL, Barichello T, Dal-Pizzol F. Mitochondrial protective effects caused by the administration of mefenamic acid in sepsis. J Neuroinflammation. 2022;19(1):268. doi:10.1186/s12974-022-02616-6
110. Mohsin M, Tabassum G, Ahmad S, Ali S, Ali Syed M. The role of mitophagy in pulmonary sepsis. Mitochondrion. 2021;59:63–75. doi:10.1016/j.mito.2021.04.009
111. Qin W, Tong X, Liang R. Preservation of mitochondrial homeostasis is responsible for the ameliorative effects of Suhuang antitussive capsule on non-resolving inflammation via inhibition of NF-κB signaling and NLRP3 inflammasome activation. J Ethnopharmacol. 2021;271:113827. doi:10.1016/j.jep.2021.113827
112. Yu J, Nagasu H, Murakami T. Inflammasome activation leads to Caspase-1-dependent mitochondrial damage and block of mitophagy. Proc Natl Acad Sci U S A. 2014;111:15514–15519. doi:10.1073/pnas.1414859111
113. Song P, Shen D-F, Meng -Y-Y. Geniposide protects against sepsis-induced myocardial dysfunction through AMPKα-dependent pathway. Free Radic Biol Med. 2020;152:186–196.
114. Wang D, Lin Z, Zhou Y. Atractylenolide I ameliorates sepsis-induced cardiomyocyte injury by inhibiting macrophage polarization through the modulation of the PARP1/NLRP3 signaling pathway. Tissue Cell. 2024;89:102424. doi:10.1016/j.tice.2024.102424
115. Zhou R, Yazdi AS, Menu P, Tschopp J. A role for mitochondria in NLRP3 inflammasome activation. Nature. 2011;469:221–225. doi:10.1038/nature09663
116. Ren G, Zhou Q, Lu M, Wang H. Rosuvastatin corrects oxidative stress and inflammation induced by LPS to attenuate cardiac injury by inhibiting the NLRP3/TLR4 pathway. Can J Physiol Pharmacol. 2021;99:964–973. doi:10.1139/cjpp-2020-0321
117. Xu P, Zhang W-Q, Xie J, et al. Shenfu injection prevents sepsis-induced myocardial injury by inhibiting mitochondrial apoptosis. J Ethnopharmacol. 2020;261:113068. doi:10.1016/j.jep.2020.113068
118. Bronner DN, Abuaita B, Chen X, et al. Endoplasmic reticulum stress activates the inflammasome via NLRP3- and Caspase-2-driven mitochondrial damage. Immunity. 2015;43(3):451–462. doi:10.1016/j.immuni.2015.08.008
119. Piñeros Alvarez AR, Glosson-Byers N, Brandt S. SOCS1 is a negative regulator of metabolic reprogramming during sepsis. JCI Insight. 2017;2(13):e92530. doi:10.1172/jci.insight.92530
120. Lin S, Jin P, Shao C. Lidocaine attenuates lipopolysaccharide-induced inflammatory responses and protects against endotoxemia in mice by suppressing HIF1α-induced glycolysis. Int Immunopharmacol. 2020;80:106150. doi:10.1016/j.intimp.2019.106150
121. Lin Q, Li S, Jiang N, et al. PINK1-parkin pathway of mitophagy protects against contrast-induced acute kidney injury via decreasing mitochondrial ROS and NLRP3 inflammasome activation. Redox Biol. 2019;26:101254. doi:10.1016/j.redox.2019.101254
122. Su S-H, Wu Y-F, Lin Q, Wang D-P, Hai J. URB597 protects against NLRP3 inflammasome activation by inhibiting autophagy dysfunction in a rat model of chronic cerebral hypoperfusion. J Neuroinflammation. 2019;16:260. doi:10.1186/s12974-019-1668-0
123. Li PA, Hou X, Hao S. Mitochondrial biogenesis in neurodegeneration. J Neurosci Res. 2017;95:2025–2029. doi:10.1002/jnr.24042
124. Liu X, Zhang X, Ding Y. Nuclear factor E2-related factor-2 negatively regulates NLRP3 inflammasome activity by inhibiting reactive oxygen species-induced NLRP3 priming. Antioxid Redox Signal. 2017;26(1):28–43. doi:10.1089/ars.2015.6615
125. O’Neill LAJ. Cardiolipin and the Nlrp3 inflammasome. Cell Metab. 2013;18:610–612. doi:10.1016/j.cmet.2013.10.013
126. Chu CT, Bayır H, Kagan VE. LC3 binds externalized cardiolipin on injured mitochondria to signal mitophagy in neurons: implications for Parkinson disease. Autophagy. 2014;10:376–378. doi:10.4161/auto.27191
127. Liu J, Wang T, He K, Xu M, Gong J-P. Cardiolipin inhibitor ameliorates the non-alcoholic steatohepatitis through suppressing NLRP3 inflammasome activation. Eur Rev Med Pharmacol Sci. 2019;23:8158–8167. doi:10.26355/eurrev_201909_19036
128. Liu Q, Zhang D, Hu D, Zhou X, Zhou Y. The role of mitochondria in NLRP3 inflammasome activation. Mol Immunol. 2018;103:115–124. doi:10.1016/j.molimm.2018.09.010
129. Brennan K, Martin K, FitzGerald SP, et al. A comparison of methods for the isolation and separation of extracellular vesicles from protein and lipid particles in human serum. Sci Rep. 2020;10(1):1039. doi:10.1038/s41598-020-57497-7
130. Ali-Khiavi P, Mohammadi M, Masoumi S, et al. The therapeutic potential of exosome therapy in sepsis management: addressing complications and improving outcomes”. Cell Biochem Biophys. 2024. doi:10.1007/s12013-024-01564-7
131. Muralidharan-Chari V, Clancy JW, Sedgwick A, D’Souza-Schorey C. Microvesicles: mediators of extracellular communication during cancer progression. J Cell Sci. 2010;123:1603–1611. doi:10.1242/jcs.064386
132. Xu M, Li X-Y, Song L, et al. miR-484 targeting of Yap1-induced LPS-inhibited proliferation, and promoted apoptosis and inflammation in cardiomyocyte. Biosci Biotechnol Biochem. 2021;85(2):378–385. doi:10.1093/bbb/zbaa009
133. Zhou T, Xiang D-K, Li S-N, et al. MicroRNA-495 ameliorates cardiac microvascular endothelial cell injury and inflammatory reaction by suppressing the NLRP3 inflammasome signaling pathway. Cell Physiol Biochem. 2018;49(2):798–815. doi:10.1159/000493042
134. Liu S, Liao Q, Xu W, Zhang Z, Yin M, Cao X. MiR-129-5p protects H9c2 cardiac myoblasts from hypoxia/reoxygenation injury by targeting TRPM7 and inhibiting NLRP3 inflammasome activation. J Cardiovasc Pharmacol. 2021;77(5):586–593. doi:10.1097/FJC.0000000000000991
135. An L, Yang T, Zhong Y, et al. Molecular pathways in sepsis-induced cardiomyocyte pyroptosis: novel finding on long non-coding RNA ZFAS1/miR-138-5p/SESN2 axis. Immunol Lett. 2021;238:47–56. doi:10.1016/j.imlet.2021.07.003
136. Zhang X, Xu C, Ji L, Zhang H. Endoplasmic reticulum stress in acute pancreatitis: exploring the molecular mechanisms and therapeutic targets. Cell Stress Chaperones. 2025;30:119–129. doi:10.1016/j.cstres.2025.03.001
137. Zhang Y, Guo S, Fu X, Zhang Q, Wang H. Emerging insights into the role of NLRP3 inflammasome and endoplasmic reticulum stress in renal diseases. Int Immunopharmacol. 2024;136:112342. doi:10.1016/j.intimp.2024.112342
138. Walter P, Ron D. The unfolded protein response: from stress pathway to homeostatic regulation. Science. 2011;334:1081–1086. doi:10.1126/science.1209038
139. Bohnert KR, McMillan JD, Kumar A. Emerging roles of ER stress and unfolded protein response pathways in skeletal muscle health and disease. J Cell Physiol. 2018;233:67–78. doi:10.1002/jcp.25852
140. Zeng H, Liu Y, Liu X, et al. Interplay of α-synuclein oligomers and endoplasmic reticulum stress in parkinson’s disease: insights into cellular dysfunctions. Inflammation. 2024. doi:10.1007/s10753-024-02156-6
141. Dekkers MC, Lambooij JM, Pu X, et al. Extracellular vesicles derived from stressed beta cells mediate monocyte activation and contribute to islet inflammation. Front Immunol. 2024;15:1393248. doi:10.3389/fimmu.2024.1393248
142. Sigurdsson V, Miharada K. Regulation of unfolded protein response in hematopoietic stem cells. Int J Hematol. 2018;107:627–633. doi:10.1007/s12185-018-2458-7
143. Gardner BM, Walter P. Unfolded proteins are Ire1-activating ligands that directly induce the unfolded protein response. Science. 2011;333:1891–1894. doi:10.1126/science.1209126
144. Ron D, Walter P. Signal integration in the endoplasmic reticulum unfolded protein response. Nat Rev Mol Cell Biol. 2007;8:519–529. doi:10.1038/nrm2199
145. Lin JH, Li H, Yasumura D, et al. IRE1 signaling affects cell fate during the unfolded protein response. Science. 2007;318(5852):944–949. doi:10.1126/science.1146361
146. Pathinayake PS, Hsu AC-Y, Waters DW, et al. Understanding the unfolded protein response in the pathogenesis of asthma. Front Immunol. 2018;9:175. doi:10.3389/fimmu.2018.00175
147. Gundamaraju R, Vemuri R, Chong WC, Bulmer AC, Eri R. Bilirubin attenuates ER stress-mediated inflammation, escalates apoptosis and reduces proliferation in the LS174T colonic epithelial cell line. Int J Med Sci. 2019;16:135–144. doi:10.7150/ijms.29134
148. Kakihana Y, Ito T, Nakahara M, Yamaguchi K, Yasuda T. Sepsis-induced myocardial dysfunction: pathophysiology and management. J Intensive Care. 2016;4:22. doi:10.1186/s40560-016-0148-1
149. Ding W, Yang L, Zhang M, Gu Y. Reactive oxygen species-mediated endoplasmic reticulum stress contributes to aldosterone-induced apoptosis in tubular epithelial cells. Biochem Biophys Res Commun. 2012;418:451–456. doi:10.1016/j.bbrc.2012.01.037
150. Li D, Cong Z, Yang C, Zhu X. Inhibition of LPS-induced Nox2 activation by VAS2870 protects alveolar epithelial cells through eliminating ROS and restoring tight junctions. Biochem Biophys Res Commun. 2020;524:575–581. doi:10.1016/j.bbrc.2020.01.134
151. Liu Z-W, Zhu H-T, Chen K-L. Protein kinase RNA-like endoplasmic reticulum kinase (PERK) signaling pathway plays a major role in reactive oxygen species (ROS)-mediated endoplasmic reticulum stress-induced apoptosis in diabetic cardiomyopathy. Cardiovasc Diabetol. 2013;12:158. doi:10.1186/1475-2840-12-158
152. Shao R, Lou X, Xue J. Thioredoxin-1 regulates IRE1α to ameliorate sepsis-induced NLRP3 inflammasome activation and oxidative stress in Raw 264.7 cell. Immunopharmacol Immunotoxicol. 2023;45(3):277–286. doi:10.1080/08923973.2022.2138431
153. Yoshida H, Matsui T, Yamamoto A, Okada T, Mori K. XBP1 mRNA is induced by ATF6 and spliced by IRE1 in response to ER stress to produce a highly active transcription factor. Cell. 2001;107:881–891. doi:10.1016/S0092-8674(01)00611-0
154. Hetz C, Papa FR. The unfolded protein response and cell fate control. Mol Cell. 2018;69:169–181. doi:10.1016/j.molcel.2017.06.017
155. Rozpedek W, Pytel D, Mucha B, Leszczynska H, Diehl JA, Majsterek I. The role of the PERK/eIF2α/ATF4/CHOP signaling pathway in tumor progression during endoplasmic reticulum stress. Curr Mol Med. 2016;16(6):533–544. doi:10.2174/1566524016666160523143937
156. Yan W, Frank CL, Korth MJ. Control of PERK eIF2α kinase activity by the endoplasmic reticulum stress-induced molecular chaperone P58 IPK. Proc Natl Acad Sci U S A. 2002;99:15920–15925. doi:10.1073/pnas.252341799
157. Hu H, Tian M, Ding C, Yu S. The C/EBP homologous protein (CHOP) transcription factor functions in endoplasmic reticulum stress-induced apoptosis and microbial infection. Front Immunol. 2018;9:3083. doi:10.3389/fimmu.2018.03083
158. Liu Y, Lian K, Zhang L. TXNIP mediates NLRP3 inflammasome activation in cardiac microvascular endothelial cells as a novel mechanism in myocardial ischemia/reperfusion injury. Basic Res Cardiol. 2014;109:415. doi:10.1007/s00395-014-0415-z
159. Hise AG, Tomalka J, Ganesan S. An essential role for the NLRP3 inflammasome in host defense against the human fungal pathogen Candida albicans. Cell Host Microbe. 2009;5:487–497. doi:10.1016/j.chom.2009.05.002
160. Gómez-Suaga P, Bravo-San Pedro JM, González-Polo RA, Fuentes JM, Niso-Santano M. ER–mitochondria signaling in Parkinson’s disease. Cell Death Dis. 2018;9:337. doi:10.1038/s41419-017-0079-3
161. Murakami T, Ockinger J, Yu J, et al. Critical role for calcium mobilization in activation of the NLRP3 inflammasome. Proc Natl Acad Sci U S A. 2012;109:11282–11287. doi:10.1073/pnas.1117765109
162. Li W, Cao T, Luo C, et al. Crosstalk between ER stress, NLRP3 inflammasome, and inflammation. Appl Microbiol Biotechnol. 2020;104:6129–6140. doi:10.1007/s00253-020-10614-y
163. Liu L, Wu H, Zang J, et al. 4-phenylbutyric acid reveals good beneficial effects on vital organ function via anti-endoplasmic reticulum stress in septic rats. Crit Care Med. 2016;44:e689–701. doi:10.1097/CCM.0000000000001662
164. Saïd-Sadier N, Padilla E, Langsley G, Ojcius DM. Aspergillus fumigatus stimulates the NLRP3 inflammasome through a pathway requiring ROS production and the Syk tyrosine kinase. PLoS One. 2010;5:e10008. doi:10.1371/journal.pone.0010008
165. Kumar H, Kumagai Y, Tsuchida T, et al. Involvement of the NLRP3 inflammasome in innate and humoral adaptive immune responses to fungal beta-glucan. J Immunol. 2009;183:8061–8067. doi:10.4049/jimmunol.0902477
166. Joshi S, Kundu S, Priya VV, Kulhari U, Mugale MN, Sahu BD. Anti-inflammatory activity of carvacrol protects the heart from lipopolysaccharide-induced cardiac dysfunction by inhibiting pyroptosis via NLRP3/Caspase1/Gasdermin D signaling axis. Life Sci. 2023;324:121743. doi:10.1016/j.lfs.2023.121743
167. Wu C, Chen Y, Zhou P, Hu Z. Recombinant human angiotensin-converting enzyme 2 plays a protective role in mice with sepsis-induced cardiac dysfunction through multiple signaling pathways dependent on converting angiotensin II to angiotensin 1-7. Ann Transl Med. 2023;11:13. doi:10.21037/atm-22-6016
168. Chen P, An Q, Huang Y, Zhang M, Mao S. Prevention of endotoxin-induced cardiomyopathy using sodium tanshinone IIA sulfonate: involvement of augmented autophagy and NLRP3 inflammasome suppression. Eur J Pharmacol. 2021;909:174438. doi:10.1016/j.ejphar.2021.174438
169. Li S, Guo Z, Zhang ZY. Protective effects of NLRP3 inhibitor MCC950 on sepsis-induced myocardial dysfunction. J Biol Regul Homeost Agents. 2021;35:141–150. doi:10.23812/20-662-A
170. Dai S, Ye B, Chen L, Hong G, Zhao G, Lu Z. Emodin alleviates LPS -induced myocardial injury through inhibition of NLRP3 inflammasome activation. Phytother Res. 2021;35:5203–5213. doi:10.1002/ptr.7191
171. Li Q, Zhang M, Zhao Y, Dong M. Irisin protects against LPS-stressed cardiac damage through inhibiting inflammation, apoptosis, and pyroptosis. Shock. 2021;56:1009–1018. doi:10.1097/SHK.0000000000001775
172. Wang J, Zhu Q, Wang Y, Peng J, Shao L, Li X. Irisin protects against sepsis-associated encephalopathy by suppressing ferroptosis via activation of the Nrf2/GPX4 signal axis. Free Radic Biol Med. 2022;187:171–184. doi:10.1016/j.freeradbiomed.2022.05.023
173. Wei A, Liu J, Li D, et al. Syringaresinol attenuates sepsis-induced cardiac dysfunction by inhibiting inflammation and pyroptosis in mice. Eur J Pharmacol. 2021;913:174644. doi:10.1016/j.ejphar.2021.174644
174. Zhang Y, Lv Y, Zhang Q. ALDH2 attenuates myocardial pyroptosis through breaking down Mitochondrion-NLRP3 inflammasome pathway in septic shock. Front Pharmacol. 2023;14:1125866. doi:10.3389/fphar.2023.1125866
175. Rathkey JK, Zhao J, Liu Z, et al. Chemical disruption of the pyroptotic pore-forming protein gasdermin D inhibits inflammatory cell death and sepsis. Sci Immunol. 2018;3(26):eaat2738. doi:10.1126/sciimmunol.aat2738
176. Li H, Li X, Xu G, Zhan F. Minocycline alleviates lipopolysaccharide-induced cardiotoxicity by suppressing the NLRP3/Caspase-1 signaling pathway. Sci Rep. 2024;14:21180. doi:10.1038/s41598-024-72133-4
177. Duan F, Li L, Liu S, et al. Cortistatin protects against septic cardiomyopathy by inhibiting cardiomyocyte pyroptosis through the SSTR2-AMPK-NLRP3 pathway. Int Immunopharmacol. 2024;134:112186. doi:10.1016/j.intimp.2024.112186
178. Kim M-J, Bae SH, Ryu J-C, et al. SESN2/sestrin2 suppresses sepsis by inducing mitophagy and inhibiting NLRP3 activation in macrophages. Autophagy. 2016;12(8):1272–1291. doi:10.1080/15548627.2016.1183081
179. Ji T, Liu Q, Yu L, et al. GAS6 attenuates sepsis-induced cardiac dysfunction through NLRP3 inflammasome-dependent mechanism. Free Radic Biol Med. 2024;210:195–211. doi:10.1016/j.freeradbiomed.2023.11.007
180. Sun H-J, Zheng G-L, Wang Z-C, et al. Chicoric acid ameliorates sepsis-induced cardiomyopathy via regulating macrophage metabolism reprogramming. Phytomedicine. 2024;123:155175. doi:10.1016/j.phymed.2023.155175
181. Zhu -X-X, Meng X-Y, Zhang A-Y, et al. Vaccarin alleviates septic cardiomyopathy by potentiating NLRP3 palmitoylation and inactivation. Phytomedicine. 2024;131:155771. doi:10.1016/j.phymed.2024.155771
182. Deng C, Liu Q, Zhao H, et al. Activation of NR1H3 attenuates the severity of septic myocardial injury by inhibiting NLRP3 inflammasome. Bioeng Transl Med. 2023;8:e10517. doi:10.1002/btm2.10517
183. Wang L, Zhao H, Xu H, et al. Targeting the TXNIP-NLRP3 interaction with PSSM1443 to suppress inflammation in sepsis-induced myocardial dysfunction. J Cell Physiol. 2021;236(6):4625–4639. doi:10.1002/jcp.30186
184. Zhang J, Wang L, Xie W, et al. Melatonin attenuates ER stress and mitochondrial damage in septic cardiomyopathy: a new mechanism involving BAP31 upregulation and MAPK-ERK pathway. J Cell Physiol. 2020;235(3):2847–2856. doi:10.1002/jcp.29190
185. Wang L-X, Ren C, Yao R-Q, et al. Sestrin2 protects against lethal sepsis by suppressing the pyroptosis of dendritic cells. Cell Mol Life Sci. 2021;78(24):8209–8227. doi:10.1007/s00018-021-03970-z
186. Han D, Li X, Li S, et al. Reduced silent information regulator 1 signaling exacerbates sepsis-induced myocardial injury and mitigates the protective effect of a liver X receptor agonist. Free Radic Biol Med. 2017;113:291–303. doi:10.1016/j.freeradbiomed.2017.10.005
187. Wu Q-R, Yang H, Zhang H-D, et al. IP3R2-mediated Ca2+ release promotes LPS-induced cardiomyocyte pyroptosis via the activation of NLRP3/Caspase-1/GSDMD pathway. Cell Death Discov. 2024;10(1):91. doi:10.1038/s41420-024-01840-8
