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The Regulatory Roles of Inflammation and Inflammasomes in Liver Diseases

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Immunology".

Deadline for manuscript submissions: closed (10 May 2024) | Viewed by 13266

Special Issue Editors

Special Issue Information

Dear Colleagues,

Inflammation is an innate immune response to protect our body from various pathogens and cellular dangers; however, chronic inflammation, which is a repeated and prolonged inflammation, is considered a critical risk factor for numerous diseases, including liver diseases. An inflammatory response consists of two successive steps, the ‘priming’ and ‘triggering’ steps, which are preparation and activation processes of inflammatory responses, respectively. The cardinal feature of the priming step is transcriptional activation of inflammatory molecules, while the key process of the triggering step is the activation of inflammasomes, intracellular protein complexes that provide a platform of the inflammatory responses. Previous studies have demonstrated that inflammation and inflammasome activation play roles in liver diseases, which provides strong evidence that inflammasomes are central players in inflammatory responses and liver diseases and may be new potential targets for developing novel therapeutics against liver diseases. However, the roles of inflammasomes and their dysregulation during inflammatory responses and liver diseases still remain to be investigated.

This Special Issue welcomes studies exploring, but not limited to, the regulatory roles of inflammasomes in inflammatory responses and liver diseases, such as non-alcoholic fatty liver disease (NAFLD), non-alcoholic steatohepatitis (NASH), hepatitis, fibrosis, cirrhosis, liver injuries, and hepatocellular carcinomas (HCCs), identifying and validating novel targets regulating inflammasome functions, and potential inflammasome-targeted therapeutics.

Dr. Young-Su Yi
Dr. Miyong Yun
Guest Editors

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Keywords

  • inflammation
  • inflammasome
  • inflammatory responses
  • liver diseases

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Published Papers (6 papers)

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Editorial

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3 pages, 163 KiB  
Editorial
The Regulatory Roles of Inflammation and Inflammasomes in Liver Diseases
by Young-Su Yi
Int. J. Mol. Sci. 2024, 25(18), 9864; https://doi.org/10.3390/ijms25189864 - 12 Sep 2024
Cited by 1 | Viewed by 1218
Abstract
Inflammation is an innate immune response that protects our body from various pathogens and cellular dangers [...] Full article

Research

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13 pages, 1022 KiB  
Article
Immune Response and Risk of Decompensation following SARS-CoV-2 Infection in Outpatients with Advanced Chronic Liver Disease
by Anna Brujats, Anna Huerta, Rubén Osuna-Gómez, Albert Guinart-Cuadra, Andreu Ferrero-Gregori, Clàudia Pujol, German Soriano, Maria Poca, Javier Fajardo, Angels Escorsell, Adolfo Gallego, Silvia Vidal, Càndid Villanueva and Edilmar Alvarado-Tapias
Int. J. Mol. Sci. 2024, 25(15), 8302; https://doi.org/10.3390/ijms25158302 - 30 Jul 2024
Viewed by 1313
Abstract
Advanced chronic liver disease (ACLD) is associated with a wide spectrum of immune dysfunction. The clinical impact of SARS-CoV-2 on the development of decompensation and immune response in unvaccinated outpatients has not as yet been clearly defined. This study aimed to evaluate the [...] Read more.
Advanced chronic liver disease (ACLD) is associated with a wide spectrum of immune dysfunction. The clinical impact of SARS-CoV-2 on the development of decompensation and immune response in unvaccinated outpatients has not as yet been clearly defined. This study aimed to evaluate the clinical and immunological impact of SARS-CoV-2 on outpatients with ACLD. This is an observational case–control study, in which ACLD outpatients were included prospectively and consecutively and classified into two groups: SARS-CoV-2 infected and non-infected. Patients’ baseline characteristics and infection data were collected and analyzed. Immunoglobulin G (IgG) levels against Spike 1 were evaluated. The primary endpoint was risk of liver decompensation during follow-up, assessed after propensity score matching and adjusted by Cox regression. Between October 2020 and July 2021, ACLD outpatients (n = 580) were identified, and 174 patients with clinical follow-up were included. SARS-CoV-2 infection incidence was 7.6% (n = 44). Risk of liver decompensation was significantly higher after infection (HR = 2.43 [1.01–5.86], p = 0.048) vs. non-infection. The time of IgG evaluation was similar in all patients (n = 74); IgG concentrations were significantly higher in compensated vs. decompensated patients (1.02 ± 0.35 pg/mL vs. 0.34 ± 0.16 pg/mL, p < 0.0001) and correlated with hemoglobin levels. The dysregulation of the innate immune response in patients with decompensated liver disease increased the risk of further decompensation following SARS-CoV-2, mainly due to a worsening of ascites. Full article
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16 pages, 3313 KiB  
Article
Overexpression of Interleukin-8 Promotes the Progression of Fatty Liver to Nonalcoholic Steatohepatitis in Mice
by Ye Eun Cho, Yeonsoo Kim, Seung-Jin Kim, Haeseung Lee and Seonghwan Hwang
Int. J. Mol. Sci. 2023, 24(20), 15489; https://doi.org/10.3390/ijms242015489 - 23 Oct 2023
Cited by 9 | Viewed by 2884
Abstract
Nonalcoholic steatohepatitis (NASH) is an advanced stage of fatty liver disease characterized by liver damage, inflammation, and fibrosis. Although neutrophil infiltration is consistently observed in the livers of patients with NASH, the precise role of neutrophil-recruiting chemokines and infiltrating neutrophils in NASH pathogenesis [...] Read more.
Nonalcoholic steatohepatitis (NASH) is an advanced stage of fatty liver disease characterized by liver damage, inflammation, and fibrosis. Although neutrophil infiltration is consistently observed in the livers of patients with NASH, the precise role of neutrophil-recruiting chemokines and infiltrating neutrophils in NASH pathogenesis remains poorly understood. Here, we aimed to elucidate the role of neutrophil infiltration in the transition from fatty liver to NASH by examining hepatic overexpression of interleukin-8 (IL8), a major chemokine responsible for neutrophil recruitment in humans. Mice fed a high-fat diet (HFD) for 3 months developed fatty liver without concurrent liver damage, inflammation, and fibrosis. Subsequent infection with an adenovirus overexpressing human IL8 for an additional 2 weeks increased IL8 levels, neutrophil infiltration, and liver injury in mice. Mechanistically, IL8-induced liver injury was associated with the upregulation of components of the NADPH oxidase 2 complex, which participate in neutrophil oxidative burst. IL8-driven neutrophil infiltration promoted macrophage aggregate formation and upregulated the expression of chemokines and inflammatory cytokines. Notably, IL8 overexpression amplified factors associated with fibrosis, including collagen deposition and hepatic stellate cell activation, in HFD-fed mice. Collectively, hepatic overexpression of human IL8 promotes neutrophil infiltration and fatty liver progression to NASH in HFD-fed mice. Full article
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14 pages, 3471 KiB  
Article
Activation of NLRP3 Inflammasome in Liver of Long Evans Lactating Rats and Its Perinatal Effects in the Offspring after Bisphenol F Exposure
by Beatriz Linillos-Pradillo, Sergio D. Paredes, María Ortiz-Cabello, Margret Schlumpf, Walter Lichtensteiger, Elena Vara, Jesús A. F. Tresguerres and Lisa Rancan
Int. J. Mol. Sci. 2023, 24(18), 14129; https://doi.org/10.3390/ijms241814129 - 15 Sep 2023
Cited by 4 | Viewed by 1637
Abstract
The liver is the organ responsible for the metabolism and detoxification of BPF, the BPA analogue that is replacing it in plastic-based products. It is not known whether BPF can trigger inflammatory responses via the NLRP3 inflammasome, which plays a major role in [...] Read more.
The liver is the organ responsible for the metabolism and detoxification of BPF, the BPA analogue that is replacing it in plastic-based products. It is not known whether BPF can trigger inflammatory responses via the NLRP3 inflammasome, which plays a major role in the development of liver disease. The aim of this study was to evaluate nitrosative stress species (RNS) and NLRP3 inflammasome activation in the liver of lactating dams after BPF exposure. Moreover, it was studied whether this effect could also be observed in the liver of female and male offspring at postnatal day 6 (PND6). 36 Long Evans rats were randomly distributed according to oral treatment into three groups: Control, BPF-low dose (LBPF; 0.0365 mg/kg b.w./day) group and BPF-high dose (HBPF; 3.65 mg/kg b.w./day) group. The levels of nitrosative stress-inducing proteins (eNOS, iNOS, HO-1d), NLRP3 inflammasome components (NLRP3, PyCARD, CASP1) and proinflammatory cytokines (IL-1β, IL-18, IFN-γ and TNF-α) were measured by gene and protein expression in the liver of lactating dams and in female and male PND6 offspring. Lactating dams treated with LBPF showed a significant increase in iNOS and HO-1d, activation of NLRP3 components (NLRP3, PyCARD, CASP1) and promoted the release of proinflammatory cytokines such as IL-1β, IL-18, IFN-γ and TNF-α. Similar effects were found in female and male PND6 offspring after perinatal exposure. LBPF oral administration and perinatal exposure caused an increase of nitrosative stress markers and proinflammatory cytokines. Also, NLRP3 inflammasome activation was significantly increased in in the liver of lactating dams and PND6 offspring. Full article
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14 pages, 7605 KiB  
Article
CXCL5 Promotes Acetaminophen-Induced Hepatotoxicity by Activating Kupffer Cells
by Kexin Qiu, Yan Pan, Weizhi Huang, Mengyuan Li, Xueqing Yan, Zixiong Zhou and Jing Qi
Int. J. Mol. Sci. 2023, 24(15), 12180; https://doi.org/10.3390/ijms241512180 - 29 Jul 2023
Cited by 2 | Viewed by 2747
Abstract
Kupffer cells (KCs) play a key part in the pathological process of acetaminophen (APAP)-induced acute liver injury (ALI), the leading cause of acute liver failure in the world. CXC motif chemokine ligand 5 (CXCL5) exerts proinflammatory effects in acute respiratory distress syndrome and [...] Read more.
Kupffer cells (KCs) play a key part in the pathological process of acetaminophen (APAP)-induced acute liver injury (ALI), the leading cause of acute liver failure in the world. CXC motif chemokine ligand 5 (CXCL5) exerts proinflammatory effects in acute respiratory distress syndrome and arthritis. In the current study, we aim to reveal the effects of CXCL5 on the activation of KCs and the role of CXCL5 in the pathogenesis of APAP-induced hepatotoxicity. The in vivo study, conducted on mice intraperitoneally injected with APAP (300 mg/kg) to establish the ALI model and then treated with Anti-CXCL5 mAb at 30 min and 12 h after the APAP challenge, showed that CXCL5 expression significantly increased in injured livers, and Anti-CXCL5 mAb mitigated the degree of APAP-evoked ALI in mice which was proven through biochemicals and histological examination. Also, neutralization of CXCL5 had no significant effect on APAP metabolism in the liver but exhibited anti-inflammatory effects and ameliorated hepatocellular death in the injured liver. The in vitro data displayed that recombinant mouse CXCL5 treatment promoted APAP-induced cellular toxicity in primary hepatocytes co-cultured with KCs, compared with single-cultured hepatocytes. Consistent with the result, we found that the Anti-CXCL5 mAb gradient decreased LPS-induced expression of inflammatory cytokines in single-cultured KCs. Therefore, CXCL5 could stimulate KCs to produce inflammatory mediators, therefore damaging hepatocytes from APAP toxicity. Full article
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Review

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21 pages, 2044 KiB  
Review
Regulatory Roles of Flavonoids in Caspase-11 Non-Canonical Inflammasome-Mediated Inflammatory Responses and Diseases
by Young-Su Yi
Int. J. Mol. Sci. 2023, 24(12), 10402; https://doi.org/10.3390/ijms241210402 - 20 Jun 2023
Cited by 11 | Viewed by 2405
Abstract
Inflammasomes are multiprotein complexes that activate inflammatory responses by inducing pyroptosis and secretion of pro-inflammatory cytokines. Along with many previous studies on inflammatory responses and diseases induced by canonical inflammasomes, an increasing number of studies have demonstrated that non-canonical inflammasomes, such as mouse [...] Read more.
Inflammasomes are multiprotein complexes that activate inflammatory responses by inducing pyroptosis and secretion of pro-inflammatory cytokines. Along with many previous studies on inflammatory responses and diseases induced by canonical inflammasomes, an increasing number of studies have demonstrated that non-canonical inflammasomes, such as mouse caspase-11 and human caspase-4 inflammasomes, are emerging key players in inflammatory responses and various diseases. Flavonoids are natural bioactive compounds found in plants, fruits, vegetables, and teas and have pharmacological properties in a wide range of human diseases. Many studies have successfully demonstrated that flavonoids play an anti-inflammatory role and ameliorate many inflammatory diseases by inhibiting canonical inflammasomes. Others have demonstrated the anti-inflammatory roles of flavonoids in inflammatory responses and various diseases, with a new mechanism by which flavonoids inhibit non-canonical inflammasomes. This review discusses recent studies that have investigated the anti-inflammatory roles and pharmacological properties of flavonoids in inflammatory responses and diseases induced by non-canonical inflammasomes and further provides insight into developing flavonoid-based therapeutics as potential nutraceuticals against human inflammatory diseases. Full article
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