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Wu T, Zhang C, Shao T, Chen J, Chen D. The Role of NLRP3 Inflammasome Activation Pathway of Hepatic Macrophages in Liver Ischemia-Reperfusion Injury. Front Immunol 2022; 13:905423. [PMID: 35757691 PMCID: PMC9229592 DOI: 10.3389/fimmu.2022.905423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Accepted: 05/12/2022] [Indexed: 11/13/2022] Open
Abstract
Ischemia-reperfusion injury (IRI) is considered an inherent component involved in liver transplantation, which induce early organ dysfunction and failure. And the accumulating evidences indicate that the activation of host innate immune system, especially hepatic macrophages, play a pivotal role in the progression of LIRI. Inflammasomes is a kind of intracellular multimolecular complexes that actively participate in the innate immune responses and proinflammatory signaling pathways. Among them, NLRP3 inflammasome is the best characterized and correspond to regulate caspase-1 activation and the secretion of proinflammatory cytokines in response to various pathogen-derived as well as danger-associated signals. Additionally, NLRP3 is highly expressed in hepatic macrophages, and the assembly of NLRP3 inflammasome could lead to LIRI, which makes it a promising therapeutic target. However, detailed mechanisms about NLRP3 inflammasome involving in the hepatic macrophages-related LIRI is rarely summarized. Here, we review the potential role of the NLRP3 inflammasome pathway of hepatic macrophages in LIRI, with highlights on currently available therapeutic options.
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Affiliation(s)
- Tong Wu
- School of Medicine, Zhejiang University, Hangzhou, China
| | - Cheng Zhang
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Tianfeng Shao
- Department of General Practice, Shaoxing Yuecheng District Tashan Street Community Health Service Center, Shaoxing, China
| | - Jianzhong Chen
- Institute of Immunology, School of Medicine, Zhejiang University, Hangzhou, China
| | - Diyu Chen
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
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Chen Q, Song Y, Yang N, Ai X, Pu L, Kong L. Aging deteriorated liver Ischemia and reperfusion injury by suppressing Tribble's proteins 1 mediated macrophage polarization. Bioengineered 2022; 13:14519-14533. [PMID: 36694470 PMCID: PMC9995131 DOI: 10.1080/21655979.2022.2090218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Aggravated liver injury has been reported in aged ischemia/reperfusion-stressed livers; however, the mechanism of aged macrophage inflammatory regulation is not well understood. Here, we found that the adaptor protein TRIB1 plays a critical role in the differentiation of macrophages and the inflammatory response in the liver after ischemia/reperfusion injury. In the present study, we determined that aging promoted macrophage-mediated liver injury and that inflammation was mainly responsible for lower M2 polarization in liver transplantation-exposed humans post I/R. Young and aged mice were subjected to hepatic I/R modeling and showed that aging aggravated liver injury and suppressed macrophage TRIB1 protein expression and anti-inflammatory function in I/R-stressed livers. Restoration of TRIB1 is mediated by lentiviral infection-induced macrophage anti-inflammatory M2 polarization and alleviated hepatic I/R injury. Moreover, TRIB1 overexpression in macrophages facilitates M2 polarization and anti-inflammation by activating MEK1-ERK1/2 signaling under IL-4 stimulation. Taken together, our results demonstrated that aging promoted hepatic I/R injury by suppressing TRIB1-mediated MEK1-induced macrophage M2 polarization and anti-inflammatory function.
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Affiliation(s)
- Qi Chen
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China.,Department of General Surgery, Sir Run Run Hospital, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yating Song
- Department of Bariatric and Metabolic Surgery, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Ningli Yang
- Department of Bariatric and Metabolic Surgery, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Xiaoming Ai
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Liyong Pu
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Lianbao Kong
- Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
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Zhong W, Rao Z, Xu J, Sun Y, Hu H, Wang P, Xia Y, Pan X, Tang W, Chen Z, Zhou H, Wang X. Defective mitophagy in aged macrophages promotes mitochondrial DNA cytosolic leakage to activate STING signaling during liver sterile inflammation. Aging Cell 2022; 21:e13622. [PMID: 35599014 PMCID: PMC9197407 DOI: 10.1111/acel.13622] [Citation(s) in RCA: 50] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 03/27/2022] [Accepted: 04/12/2022] [Indexed: 01/18/2023] Open
Abstract
Macrophage‐stimulator of interferon genes (STING) signaling mediated sterile inflammation has been implicated in various age‐related diseases. However, whether and how macrophage mitochondrial DNA (mtDNA) regulates STING signaling in aged macrophages remains largely unknown. We found that hypoxia‐reoxygenation (HR) induced STING activation in macrophages by triggering the release of macrophage mtDNA into the cytosol. Aging promoted the cytosolic leakage of macrophage mtDNA and enhanced STING activation, which was abrogated upon mtDNA depletion or cyclic GMP‐AMP Synthase (cGAS) inhibition. Aged macrophages exhibited increased mitochondrial injury with impaired mitophagy. Mechanistically, a decline in the PTEN‐induced kinase 1 (PINK1)/Parkin‐mediated polyubiquitination of mitochondria was observed in aged macrophages. Pink1 overexpression reversed the inhibition of mitochondrial ubiquitination but failed to promote mitolysosome formation in the aged macrophages. Meanwhile, aging impaired lysosomal biogenesis and function in macrophages by modulating the mTOR/transcription factor EB (TFEB) signaling pathway, which could be reversed by Torin‐1 treatment. Consequently, Pink1 overexpression in combination with Torin‐1 treatment restored mitophagic flux and inhibited mtDNA/cGAS/STING activation in aged macrophages. Moreover, besides HR‐induced metabolic stress, other types of oxidative and hepatotoxic stresses inhibited mitophagy and promoted the cytosolic release of mtDNA to activate STING signaling in aged macrophages. STING deficiency protected aged mice against diverse types of sterile inflammatory liver injuries. Our findings suggest that aging impairs mitophagic flux to facilitate the leakage of macrophage mtDNA into the cytosol and promotes STING activation, and thereby provides a novel potential therapeutic target for sterile inflammatory liver injury in aged patients.
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Affiliation(s)
- Weizhe Zhong
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
| | - Zhuqing Rao
- Department of Anesthesiology The First Affiliated Hospital with Nanjing Medical University Nanjing China
| | - Jian Xu
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
| | - Yu Sun
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
| | - Haoran Hu
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
| | - Ping Wang
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
| | - Yongxiang Xia
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
| | - Xiongxiong Pan
- Department of Anesthesiology The First Affiliated Hospital with Nanjing Medical University Nanjing China
| | - Weiwei Tang
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
| | - Ziyi Chen
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
| | - Haoming Zhou
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
| | - Xuehao Wang
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
- NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical University Nanjing China
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Mitochondrial damage and activation of the cytosolic DNA sensor cGAS-STING pathway lead to cardiac pyroptosis and hypertrophy in diabetic cardiomyopathy mice. Cell Death Dis 2022; 8:258. [PMID: 35538059 PMCID: PMC9091247 DOI: 10.1038/s41420-022-01046-w] [Citation(s) in RCA: 74] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 04/22/2022] [Accepted: 04/26/2022] [Indexed: 02/07/2023]
Abstract
Diabetic cardiomyopathy (DCM) is a serious cardiac complication of diabetes that currently lacks specific treatment. The cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING) signaling pathway has been suggested to contribute to the pathogenesis of cardiovascular diseases. However, whether cGAS-STING is involved in the development of DCM has not been established. Our study aimed to determine the role of cGAS-STING in the initiation of nucleotide-binding oligomerization domain-like receptor pyrin domain containing 3 (NLRP3) inflammasome-induced cardiac pyroptosis and chronic inflammation during the pathogenesis of DCM. C57BL/6J mice were preinjected with adeno-associated virus 9 (AAV9) intravenously via the tail vein to specifically knock down myocardial STING. After four weeks, mice with myocardium-specific knockdown of STING received injections of streptozotocin (STZ; 50 mg/kg) and a high-fat diet to induce diabetes. Measurements included echocardiography, immunohistochemical analyses, wheat germ agglutinin (WGA) staining, and western blotting. Here, we showed that the cGAS-STING signaling pathway was activated in diabetic hearts, which was indicated by the increased phosphorylation of TANK-binding kinase 1 (TBK1) and interferon (IFN) regulatory factor 3 (IRF3), leading to the activation of the NLRP3 inflammasome in the hearts of diabetic mice and proinflammatory cytokine release into serum. Moreover, STING knockdown via adeno-associated virus-9 (AAV9) in diabetic mouse heart alleviated cardiac pyroptosis and the inflammatory response, prevented diabetes-induced hypertrophy, and restored cardiac function. Mechanistically, we showed that palmitic acid (PA)-induced lipotoxicity impairs mitochondrial homeostasis, producing excessive mitochondrial reactive oxygen species (mtROS), which results in oxidative damage to mitochondrial DNA (mtDNA) and its release into the cytoplasm while switching on cGAS-STING-mediated pyroptosis in cardiomyocytes, thereby worsening the progression of diabetic cardiomyopathy. Our study demonstrated that activation of the cGAS-STING pathway caused by mitochondrial oxidative damage and mtDNA escape induced by free fatty acids promoted pyroptosis and proinflammatory responses in cardiomyocytes in a NLRP3 inflammasome-dependent manner, thus promoting myocardial hypertrophy during the progression of DCM.
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Kong L, Li W, Chang E, Wang W, Shen N, Xu X, Wang X, Zhang Y, Sun W, Hu W, Xu P, Liu X. mtDNA-STING Axis Mediates Microglial Polarization via IRF3/NF-κB Signaling After Ischemic Stroke. Front Immunol 2022; 13:860977. [PMID: 35450066 PMCID: PMC9017276 DOI: 10.3389/fimmu.2022.860977] [Citation(s) in RCA: 59] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 03/16/2022] [Indexed: 12/31/2022] Open
Abstract
Neuroinflammation is initiated in response to ischemic stroke, and is usually characterized by microglial activation and polarization. Stimulator of interferon genes (STING) has been shown to play a critical role in anti-tumor immunity and inflammatory diseases. Nevertheless, the effect and underlying mechanisms of STING on microglial polarization after ischemic stroke remain unclarified. In this study, acute ischemic stroke was simulated using a model of middle cerebral artery occlusion (MCAO) at adult male C57BL/6 mice in vivo and the BV2 microglia oxygen-glucose deprivation/reperfusion (OGD/R) model in vitro. The specific STING inhibitor C-176 was administered intraperitoneally at 30min after MCAO. We found that the expression of microglial STING was increased following MCAO and OGD/R. Pharmacologic inhibition of STING with C-176 reduced the ischemia/reperfusion (I/R)-induced brain infarction, edema and neuronal injury. Moreover, blockade of STING improved neurological performance and cognitive function and attenuated neuronal degeneration in the hippocampus after MCAO. Mechanistically, both in vivo and in vitro, we delineated that STING could promote the polarization of microglia towards the M1 phenotype and restrain M2 microglia polarization via downstream pathways, including interferon regulatory factor 3 (IRF3) and nuclear factor-κB (NF-κB). In addition, mitochondrial DNA (mtDNA), which is released to microglial cytoplasm induced by I/R injury, could facilitate microglia towards M1 modality through STING signaling pathway. Treatment with C-176 abolished the detrimental effects of mtDNA on stroke outcomes. Taken together, these findings suggest that STING, activated by mtDNA, could polarize microglia to the M1 phenotype following MCAO. Inhibition of STING may serve as a potential therapeutic strategy to mitigate neuroinflammation after ischemic stroke.
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Affiliation(s)
- Lingqi Kong
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Wenyu Li
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - E Chang
- The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Wuxuan Wang
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Nan Shen
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Xiang Xu
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Xinyue Wang
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Yan Zhang
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Wen Sun
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Wei Hu
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Pengfei Xu
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Xinfeng Liu
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
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Lei C, Tan Y, Ni D, Peng J, Yi G. cGAS-STING signaling in ischemic diseases. Clin Chim Acta 2022; 531:177-182. [DOI: 10.1016/j.cca.2022.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 03/30/2022] [Accepted: 04/05/2022] [Indexed: 12/15/2022]
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Liu Z, Wang M, Wang X, Bu Q, Wang Q, Su W, Li L, Zhou H, Lu L. XBP1 deficiency promotes hepatocyte pyroptosis by impairing mitophagy to activate mtDNA-cGAS-STING signaling in macrophages during acute liver injury. Redox Biol 2022; 52:102305. [PMID: 35367811 PMCID: PMC8971356 DOI: 10.1016/j.redox.2022.102305] [Citation(s) in RCA: 105] [Impact Index Per Article: 52.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 03/13/2022] [Accepted: 03/25/2022] [Indexed: 12/23/2022] Open
Abstract
Hepatocellular cell death and macrophage proinflammatory activation contribute to the pathology of various liver diseases, during which XBP1 plays an important role. However, the function and mechanism of XBP1 in thioacetamide (TAA)-induced acute liver injury (ALI) remains unknown. Here, we investigated the effects of XBP1 inhibition on promoting hepatocellular pyroptosis to activate macrophage STING signaling during ALI. While both TAA- and LPS-induced ALI triggered XBP1 activation in hepatocytes, hepatocyte-specific XBP1 knockout mice exhibited exacerbated ALI with increased hepatocellular pyroptosis and enhanced macrophage STING activation. Mechanistically, mtDNA released from TAA-stressed hepatocytes could be engulfed by macrophages, further inducing macrophage STING activation in a cGAS- and dose-dependent manner. XBP1 deficiency increased ROS production to promote hepatocellular pyroptosis by activating NLRP3/caspase-1/GSDMD signaling, which facilitated the extracellular release of mtDNA. Moreover, impaired mitophagy was found in XBP1 deficient hepatocytes, which was reversed by PINK1 overexpression. Mitophagy restoration also inhibited macrophage STING activation and ALI in XBP1 deficient mice. Activation of XBP1-mediated hepatocellular mitophagy and pyroptosis and macrophage STING signaling pathway were observed in human livers with ALI. Collectively, these findings demonstrate that XBP1 deficiency promotes hepatocyte pyroptosis by impairing mitophagy to activate mtDNA/cGAS/STING signaling of macrophages, providing potential therapeutic targets for ALI. XBP1 deficiency promoted hepatocellular pyroptosis and extracellular mtDNA release to enhance macrophage STING activation. XBP1 deficiency promoted ROS/NLRP3/caspase-1/GSDMD-mediated hepatocyte pyroptosis by impairing mitophagy. Hepatocellular mitophagy and pyroptosis and macrophage STING activation were detected in human livers with ALI. Hepatocyte-specific XBP1 deficiency aggravated TAA-induced ALI in mice.
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STING Induces Liver Ischemia-Reperfusion Injury by Promoting Calcium-Dependent Caspase 1-GSDMD Processing in Macrophages. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:8123157. [PMID: 35281468 PMCID: PMC8906939 DOI: 10.1155/2022/8123157] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 10/26/2021] [Accepted: 01/15/2022] [Indexed: 12/31/2022]
Abstract
Objectives Although a recent study reported that stimulator of interferon genes (STING) in macrophages has an important regulatory effect on liver ischemia-reperfusion injury (IRI), the underlying mechanism of STING-dependent innate immune activation in liver macrophages (Kupffer cells, KCs) remains unclear. Here, we investigated the effect of STING on liver macrophage pyroptosis and the associated regulatory mechanism of liver IRI. Methods Clodronate liposomes were used to block liver macrophages. AAV-STING-RNAi-F4/80-EGFP, an adenoassociated virus (AAV), was transfected into the portal vein of mice in vivo, and the liver IRI model was established 14 days later. In vitro, liver macrophages were treated with STING-specific siRNA, and a hypoxia-reoxygenation (H/R) model was established. The level of STING was detected via Western blotting (WB), RT-PCR, and immunostaining. Liver tissue and blood samples were collected. Pathological changes in liver tissue were detected by hematoxylin and eosin (H&E) staining. Macrophage pyroptosis was detected by WB, confocal laser scanning microscopy (CLSM), transmission electron microscopy (TEM), and enzyme-linked immunosorbent assay (ELISA). The calcium concentration was measured by immunofluorescence and analyzed with a fluorescence microplate reader. Results The expression of STING increased with liver IRI but decreased significantly after the clodronate liposome blockade of liver macrophages. After knockdown of STING, the activation of caspase 1-GSDMD in macrophages and liver IRI was alleviated. More interestingly, hypoxia/reoxygenation (H/R) increased the calcium concentration in liver macrophages, but the calcium concentration was decreased after STING knockdown. Furthermore, after the inhibition of calcium in H/R-induced liver macrophages by BAPTA-AM, pyroptosis was significantly reduced, but the expression of STING was not significantlydecreased. Conclusions Knockdown of STING reduces calcium-dependent macrophage caspase 1-GSDMD-mediated liver IRI, representing a potential therapeutic approach in the clinic.
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Bao T, Liu J, Leng J, Cai L. The cGAS-STING pathway: more than fighting against viruses and cancer. Cell Biosci 2021; 11:209. [PMID: 34906241 PMCID: PMC8670263 DOI: 10.1186/s13578-021-00724-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 12/02/2021] [Indexed: 01/07/2023] Open
Abstract
In the classic Cyclic guanosine monophosphate–adenosine monophosphate (cGAMP) synthase (cGAS)-stimulator of interferon genes (STING) pathway, downstream signals can control the production of type I interferon and nuclear factor kappa-light-chain-enhancer of activated B cells to promote the activation of pro-inflammatory molecules, which are mainly induced during antiviral responses. However, with progress in this area of research, studies focused on autoimmune diseases and chronic inflammatory conditions that may be relevant to cGAS–STING pathways have been conducted. This review mainly highlights the functions of the cGAS–STING pathway in chronic inflammatory diseases. Importantly, the cGAS–STING pathway has a major impact on lipid metabolism. Different research groups have confirmed that the cGAS–STING pathway plays an important role in the chronic inflammatory status in various organs. However, this pathway has not been studied in depth in diabetes and diabetes-related complications. Current research on the cGAS–STING pathway has shown that the targeted therapy of diseases that may be caused by inflammation via the cGAS–STING pathway has promising outcomes.
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Affiliation(s)
- Terigen Bao
- Department of Geriatrics, The First Hospital of Jilin University, Changchun, 130021, China.,Department of Pediatrics, The Pediatric Research Institute, The University of Louisville School of Medicine, Louisville, KY, 40292, USA
| | - Jia Liu
- Department of Geriatrics, The First Hospital of Jilin University, Changchun, 130021, China
| | - Jiyan Leng
- Department of Geriatrics, The First Hospital of Jilin University, Changchun, 130021, China.
| | - Lu Cai
- Department of Pediatrics, The Pediatric Research Institute, The University of Louisville School of Medicine, Louisville, KY, 40292, USA.,Departments of Pharmacology and Toxicology, The University of Louisville School of Medicine, Louisville, KY, USA
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Yue Y, Du Z, Tao J, Shi L. Inhibition of microRNA-297 alleviates THLE-2 cell injury induced by hypoxia/reoxygenation by inhibiting NLRP3 inflammasome activation via SIRT3. Can J Physiol Pharmacol 2021; 100:125-133. [PMID: 34559973 DOI: 10.1139/cjpp-2021-0287] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
It has been acknowledged that microRNAs (miRNAs/miRs) assume a critical role in hypoxia/reoxygenation (H/R)-induced hepatocyte injury. Therefore, cell experiments were performed in this study to investigate the mechanism of miR-297 in H/R-induced hepatocyte injury with the involvement of Sirtuin 3 (SIRT3) and NLRP3. Initially, THLE-2 cells were utilized for H/R challenge. After miR-297 antagomir and NLRP3 adenovirus vector delivery, THLE-2 cell proliferation and apoptosis were measured by MTT, EdU and TUNEL assays, respectively. Enzyme-linked immunosorbent assay was conducted to evaluate the levels of apoptosis-related indicators (Bax and Bcl-2) and inflammation-related indicators (IL-6 and IL-10), western blot analysis to detect NLRP3 and Cleaved Caspase-1 expression. The binding relation between miR-297 and SIRT3 was examined using dual-luciferase assay. The results showed that miR-297 antagomir repressed the apoptosis and inflammation induced by H/R treatment in THLE-2 cells. Mechanistically, miR-297 antagomir diminished the extent of IκBα and NF-κB phosphorylation and NLRP3 activation in H/R-induced THLE-2 cells by targeting SIRT3. Furthermore, NLRP3 overexpression normalized the promoting effects of miR-297 antagomir on proliferation and its inhibitory effects on apoptosis and inflammation in H/R-induced THLE-2 cells. In summary, our results elucidated that miR-297 antagomir repressed H/R-induced THLE-2 cell injury via SIRT3 promotion and NLRP3 inactivation.
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Affiliation(s)
- Yuan Yue
- First Affiliated Hospital of Medical College of Xi'an Jiaotong University, Department of Pharmacy, Xi'an, China;
| | - Zhilin Du
- First Affiliated Hospital of Medical College of Xi'an Jiaotong University, Xi'an, China;
| | - Jie Tao
- First Affiliated Hospital of Medical College of Xi'an Jiaotong University, Xi'an, China;
| | - Lei Shi
- First Affiliated Hospital of Medical College of Xi'an Jiaotong University, Xi'an, China;
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Guo Q, Zhu D, Wang Y, Miao Z, Chen Z, Lin Z, Lin J, Huang C, Pan L, Wang L, Zeng S, Wang J, Zheng X, Lin Y, Zhang X, Wu Y. Targeting STING attenuates ROS induced intervertebral disc degeneration. Osteoarthritis Cartilage 2021; 29:1213-1224. [PMID: 34020031 DOI: 10.1016/j.joca.2021.04.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 04/13/2021] [Accepted: 04/15/2021] [Indexed: 02/02/2023]
Abstract
OBJECTIVE DNA damage induced by ROS is considered one of the main causes of nucleus pulposus (NP) cells degeneration during the progression of intervertebral disc degeneration (IVDD). cGAS-STING pathway acts as DNA-sensing mechanism for monitoring DNA damage. Recent studies have proved that cGAS-STING contributes to the development of various diseases by inducing inflammation, senescence, and apoptosis. This work explored the role of STING, the main effector of cGAS-STING signaling pathway, in NP degeneration. METHOD Immunohistochemistry was conducted to measure STING protein levels in the nucleus pulposus tissues from human and puncture-induced IVDD rat models. TBHP induces degeneration of nucleus pulposus cells in vitro. For in vivo experiments, lv-NC or lv-STING were injected into the central intervertebral disc space. The degeneration level of IVDD was assessed by MRI, X-ray, HE, and Safranin O staining. RESULTS We found that the expression of STING was upregulated in human and rat degenerated NP tissue as well as in TBHP-treated NP cells. Overexpression of STING promoted the degradation of extracellular matrix; it also promoted apoptosis and senescence of TBHP-treated and untreated NP cells. Knock-down of STING significantly reversed these effects. Mechanistically, STING activated IRF3, whereas blockage of IRF3 attenuated STING-induced apoptosis, senescence and ECM degradation. In vivo experiments revealed that STING knock-down alleviated puncture-induced IVDD development. CONCLUSION STING promotes IVDD progress via IRF3, while suppression of STING may be a promising treatment for IVDD.
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Affiliation(s)
- Q Guo
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - D Zhu
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - Y Wang
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - Z Miao
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - Z Chen
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - Z Lin
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - J Lin
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - C Huang
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - L Pan
- Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - L Wang
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - S Zeng
- The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - J Wang
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China
| | - X Zheng
- Department of Vascular Surgery, The Second Affiliated Hospital & Yuying Ghildren's Hospital of Wenzhou Medical University, China
| | - Y Lin
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China.
| | - X Zhang
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China; Chinese Orthopaedic Regenerative Medicine Society, China.
| | - Y Wu
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang Province, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang Province, China.
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Wang Z, Chen N, Li Z, Xu G, Zhan X, Tang J, Xiao X, Bai Z. The Cytosolic DNA-Sensing cGAS-STING Pathway in Liver Diseases. Front Cell Dev Biol 2021; 9:717610. [PMID: 34386500 PMCID: PMC8353273 DOI: 10.3389/fcell.2021.717610] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 07/05/2021] [Indexed: 12/23/2022] Open
Abstract
Inflammation is regulated by the host and is a protective response activated by the evolutionarily conserved immune system in response to harmful stimuli, such as dead cells or pathogens. cGAS-STING pathway is a vital natural sensor of host immunity that can defend various tissues and organs against pathogenic infection, metabolic syndrome, cellular stress and cancer metastasis. The potential impact of cGAS-STING pathway in hepatic ischemia reperfusion (I/R) injury, alcoholic/non-alcoholic steatohepatitis (ASH), hepatic B virus infection, and other liver diseases has recently attracted widespread attention. In this review, the relationship between cGAS-STING pathway and the pathophysiological mechanisms and progression of liver diseases is summarized. Additionally, we discuss various pharmacological agonists and antagonists of cGAS-STING signaling as novel therapeutics for the treatment of liver diseases. A detailed understanding of mechanisms and biology of this pathway will lay a foundation for the development and clinical application of therapies for related liver diseases.
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Affiliation(s)
- Zhilei Wang
- TCM Regulating Metabolic Diseases Key Laboratory of Sichuan Province, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Department of Liver Diseases, The Fifth Medical Centre, Chinese PLA General Hospital, Beijing, China.,State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Nian Chen
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Zhiyong Li
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Guang Xu
- Department of Liver Diseases, The Fifth Medical Centre, Chinese PLA General Hospital, Beijing, China
| | - Xiaoyan Zhan
- Department of Liver Diseases, The Fifth Medical Centre, Chinese PLA General Hospital, Beijing, China
| | - Jianyuan Tang
- TCM Regulating Metabolic Diseases Key Laboratory of Sichuan Province, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Xiaohe Xiao
- Department of Liver Diseases, The Fifth Medical Centre, Chinese PLA General Hospital, Beijing, China.,State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,China Military Institute of Chinese Materia, The Fifth Medical Centre, Chinese PLA General Hospital, Beijing, China
| | - Zhaofang Bai
- Department of Liver Diseases, The Fifth Medical Centre, Chinese PLA General Hospital, Beijing, China.,China Military Institute of Chinese Materia, The Fifth Medical Centre, Chinese PLA General Hospital, Beijing, China
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63
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Cao Q, Luo J, Xiong Y, Liu Z, Ye Q. 25-Hydroxycholesterol mitigates hepatic ischemia reperfusion injury via mediating mitophagy. Int Immunopharmacol 2021; 96:107643. [PMID: 33878616 DOI: 10.1016/j.intimp.2021.107643] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 04/02/2021] [Accepted: 04/02/2021] [Indexed: 01/22/2023]
Abstract
Hepatic ischemia reperfusion (I/R) injury remains a major obstacle in liver transplantation, however an effective treatment to mitigate this injury is lacking. 25-Hydroxycholesterol (25HC) is a kind of oxysterol involved in inflammatory and immune responses. However, its function and the underlying mechanism on rat hepatic I/R injury has not been explored. A well-established rat model of partial warm ischemia reperfusion injury was performed. 25HC was intraperitoneally administrated 4 h before ischemia. The results verified that 25HC pretreatment effectively mitigated liver I/R injury, which was demonstrated by lower serum levels of transaminases, histology injury score and less apoptosis. Mechanistically, 25HC pretreatment activated PINK1/Parkin dependent mitophagy and inhibited the NLRP3 inflammasome. Via using mitophagy inhibitor 3-methyladenine (3-MA), we further found that 3-MA counteracted the protective effect of 25HC on hepatic I/R injury and the NLRP3 inflammasome. In conclusion, 25HC pretreatment ameliorates rat hepatic I/R injury, and this protective effect may be dependent on activating mitophagy and inhibiting NLRP3 inflammasome activation.
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Affiliation(s)
- Qin Cao
- Zhongnan Hospital of Wuhan University, Institute of Hepatobiliary Diseases of Wuhan University, Transplant Center of Wuhan University, Hubei Key Laboratory of Medical Technology on Transplantation, Engineering Research Center of Natural Polymer-based Medical Materials in Hubei Province, Wuhan 430071, China
| | - Jun Luo
- Zhongnan Hospital of Wuhan University, Institute of Hepatobiliary Diseases of Wuhan University, Transplant Center of Wuhan University, Hubei Key Laboratory of Medical Technology on Transplantation, Engineering Research Center of Natural Polymer-based Medical Materials in Hubei Province, Wuhan 430071, China
| | - Yan Xiong
- Zhongnan Hospital of Wuhan University, Institute of Hepatobiliary Diseases of Wuhan University, Transplant Center of Wuhan University, Hubei Key Laboratory of Medical Technology on Transplantation, Engineering Research Center of Natural Polymer-based Medical Materials in Hubei Province, Wuhan 430071, China
| | - Zhongzhong Liu
- Zhongnan Hospital of Wuhan University, Institute of Hepatobiliary Diseases of Wuhan University, Transplant Center of Wuhan University, Hubei Key Laboratory of Medical Technology on Transplantation, Engineering Research Center of Natural Polymer-based Medical Materials in Hubei Province, Wuhan 430071, China.
| | - Qifa Ye
- Zhongnan Hospital of Wuhan University, Institute of Hepatobiliary Diseases of Wuhan University, Transplant Center of Wuhan University, Hubei Key Laboratory of Medical Technology on Transplantation, Engineering Research Center of Natural Polymer-based Medical Materials in Hubei Province, Wuhan 430071, China; The Third Xiangya Hospital of Central South University, Research Center of National Health Ministry on Transplantation Medicine Engineering and Technology, Changsha 410013, China.
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64
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Mitochondrial DNA-Mediated Inflammation in Acute Kidney Injury and Chronic Kidney Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:9985603. [PMID: 34306320 PMCID: PMC8263241 DOI: 10.1155/2021/9985603] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 06/19/2021] [Indexed: 12/25/2022]
Abstract
The integrity and function of mitochondria are essential for normal kidney physiology. Mitochondrial DNA (mtDNA) has been widely a concern in recent years because its abnormalities may result in disruption of aerobic respiration, cellular dysfunction, and even cell death. Particularly, aberrant mtDNA copy number (mtDNA-CN) is associated with the development of acute kidney injury and chronic kidney disease, and urinary mtDNA-CN shows the potential to be a promising indicator for clinical diagnosis and evaluation of kidney function. Several lines of evidence suggest that mtDNA may also trigger innate immunity, leading to kidney inflammation and fibrosis. In mechanism, mtDNA can be released into the cytoplasm under cell stress and recognized by multiple DNA-sensing mechanisms, including Toll-like receptor 9 (TLR9), cytosolic cGAS-stimulator of interferon genes (STING) signaling, and inflammasome activation, which then mediate downstream inflammatory cascades. In this review, we summarize the characteristics of these mtDNA-sensing pathways mediating inflammatory responses and their role in the pathogenesis of acute kidney injury, nondiabetic chronic kidney disease, and diabetic kidney disease. In addition, we highlight targeting of mtDNA-mediated inflammatory pathways as a novel therapeutic target for these kidney diseases.
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65
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Chen R, Du J, Zhu H, Ling Q. The role of cGAS-STING signalling in liver diseases. JHEP Rep 2021; 3:100324. [PMID: 34381984 PMCID: PMC8340306 DOI: 10.1016/j.jhepr.2021.100324] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Revised: 05/20/2021] [Accepted: 06/08/2021] [Indexed: 12/12/2022] Open
Abstract
The recently identified novel cytosolic DNA sensor cyclic GMP-AMP synthase (cGAS) activates the downstream adaptor protein stimulator of interferon genes (STING) by catalysing the synthesis of cyclic GMP-AMP. This in turn initiates an innate immune response through the release of various cytokines, including type I interferon. Foreign DNA (microbial infection) or endogenous DNA (nuclear or mitochondrial leakage) can serve as cGAS ligands and lead to the activation of cGAS-STING signalling. Therefore, the cGAS-STING pathway plays essential roles in infectious diseases, sterile inflammation, tumours, and autoimmune diseases. In addition, cGAS-STING signalling affects the progression of liver inflammation through other mechanisms, such as autophagy and metabolism. In this review, we summarise recent advances in our understanding of the role of cGAS-STING signalling in the innate immune modulation of different liver diseases. Furthermore, we discuss the therapeutic potential of targeting the cGAS-STING pathway in the treatment of liver diseases.
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Key Words
- AIM2, absent in melanoma 2
- ALD, alcohol-related liver disease
- APCs, antigen-presenting cells
- CDNs, cyclic dinucleotides
- DAMPs, damage-associated molecular patterns
- DCs, dendritic cells
- ER, endoplasmic reticulum
- GVHD, graft-versus-host disease
- HCC, hepatocellular carcinoma
- HSCs, hepatic stellate cells
- IFN-I, type I interferon
- IL, interleukin
- IRF3, interferon regulatory factor 3
- IRI, ischaemia refusion injury
- KCs, Kupffer cells
- LSECs, liver sinusoidal endothelial cells
- MHC, major histocompatibility complex
- NAFLD, non-alcoholic fatty liver disease
- NK cells, natural killer cells
- NPCs, non-parenchymal cells
- PAMPs, pathogen-associated molecular patterns
- PD-1, programmed cell death protein-1
- PD-L1, programmed cell death protein ligand-1
- PPRs, pattern recognition receptors
- SAVI, STING-associated vasculopathy with onset in infancy
- STING, stimulator of interferon genes
- TBK1, TANK-binding kinase 1
- TGF-β1, transforming growth factor-β1
- TLR, Toll-like receptor
- TNF, tumour necrosis factor
- XRCC, X-ray repair cross complementing
- aHSCT, allogeneic haematopoietic stem cell transplantation
- cGAMP, cyclic guanosine monophosphate-adenosine monophosphate
- cGAS, cyclic guanosine monophosphate-adenosine monophosphate synthase
- cGAS-STING signalling
- dsDNA, double-strand DNA
- hepatocellular carcinoma
- innate immune response
- liver injury
- mTOR, mammalian target of rapamycin
- mtDNA, mitochondrial DNA
- nonalcoholic fatty liver disease
- siRNA, small interfering RNA
- ssRNA, single-stranded RNA
- viral hepatitis
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Affiliation(s)
- Ruihan Chen
- Department of Surgery, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jiamin Du
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Hong Zhu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Qi Ling
- Department of Surgery, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
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Zhang R, Kang R, Tang D. The STING1 network regulates autophagy and cell death. Signal Transduct Target Ther 2021; 6:208. [PMID: 34078874 PMCID: PMC8172903 DOI: 10.1038/s41392-021-00613-4] [Citation(s) in RCA: 108] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 04/01/2021] [Accepted: 04/08/2021] [Indexed: 01/18/2023] Open
Abstract
Cell death and immune response are at the core of life. In past decades, the endoplasmic reticulum (ER) protein STING1 (also known as STING or TMEM173) was found to play a fundamental role in the production of type I interferons (IFNs) and pro-inflammatory cytokines in response to DNA derived from invading microbial pathogens or damaged hosts by activating multiple transcription factors. In addition to this well-known function in infection, inflammation, and immunity, emerging evidence suggests that the STING1-dependent signaling network is implicated in health and disease by regulating autophagic degradation or various cell death modalities (e.g., apoptosis, necroptosis, pyroptosis, ferroptosis, mitotic cell death, and immunogenic cell death [ICD]). Here, we outline the latest advances in our understanding of the regulating mechanisms and signaling pathways of STING1 in autophagy and cell death, which may shed light on new targets for therapeutic interventions.
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Affiliation(s)
- Ruoxi Zhang
- Department of Surgery, UT Southwestern Medical Center, Dallas, TX, USA
| | - Rui Kang
- Department of Surgery, UT Southwestern Medical Center, Dallas, TX, USA
| | - Daolin Tang
- Department of Surgery, UT Southwestern Medical Center, Dallas, TX, USA.
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Remote and Anesthetic-Induced Myocardial Preconditioning Is Preserved in Atherosclerotic LDL Receptor-/- Mice In Vivo. Cardiovasc Ther 2021; 2021:5596590. [PMID: 34113390 PMCID: PMC8166506 DOI: 10.1155/2021/5596590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 04/29/2021] [Accepted: 05/07/2021] [Indexed: 11/18/2022] Open
Abstract
Introduction In the animal model, preconditioning is a powerful weapon against ischemic damage. The reason why the human heart cannot be protected from ischemic damage by preconditioning remains unclear. There are assumptions that the lack of preconditioning in humans is caused by concomitant diseases such as dyslipoproteinemia and arteriosclerosis. This study investigates whether dyslipoproteinemia and the resulting arteriosclerosis can be a cause of a reduced precondition effect of heart in mice. Methods LDL receptor-deficient mice were fed a long-term (14-16 weeks) high-fat atherogenic diet to induce arteriosclerosis. Arteriosclerosis was identified by histological examination and vessel contraction tests. LDLR-/- and wild-type mice were randomly assigned to anesthetic-induced, remote ischemic, or no preconditioning. All mice were subjected to 45 minutes of coronary artery occlusion and 180 minutes of reperfusion. The area at risk and infarct size were determined by Evans Blue and triphenyltetrazolium chloride staining. Results Histopathological examination showed atherosclerosis in high-fat atherogenic fed LDLR-/- mice, and the vessel relaxation capacity was significantly reduced compared to wild-type mice. In the wild type, as expected, infarct size was significantly reduced by preconditioning compared to the control. In LDLR-/- mice, infarct size was significantly reduced by preconditioning compared to the control. Surprisingly, the LDLR-/- control group also had a significantly reduced infarct size compared to the wild-type control group. Conclusion We were able to demonstrate that a high-fat diet morphologically and functionally triggered atherosclerosis in LDLR-/- mice. Interestingly, LDLR-/- mice with an atherogenic diet had smaller infarct sizes compared to wild-type mice. Moreover, preconditioning additionally reduced myocardial infarct size in LDLR-/- mice. A long-term high-fat atherogenic diet and preconditioning seem to result in additive cardioprotection in LDLR-/- mice.
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Xu D, Tian Y, Xia Q, Ke B. The cGAS-STING Pathway: Novel Perspectives in Liver Diseases. Front Immunol 2021; 12:682736. [PMID: 33995425 PMCID: PMC8117096 DOI: 10.3389/fimmu.2021.682736] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 04/19/2021] [Indexed: 12/18/2022] Open
Abstract
Liver diseases represent a major global health burden accounting for approximately 2 million deaths per year worldwide. The liver functions as a primary immune organ that is largely enriched with various innate immune cells, including macrophages, dendritic cells, neutrophils, NK cells, and NKT cells. Activation of these cells orchestrates the innate immune response and initiates liver inflammation in response to the danger signal from pathogens or injured cells and tissues. The cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING) pathway is a crucial signaling cascade of the innate immune system activated by cytosol DNA. Recognizing DNA as an immune-stimulatory molecule is an evolutionarily preserved mechanism in initiating rapid innate immune responses against microbial pathogens. The cGAS is a cytosolic DNA sensor eliciting robust immunity via the production of cyclic GMP-AMPs that bind and activate STING. Although the cGAS-STING pathway has been previously considered to have essential roles in innate immunity and host defense, recent advances have extended the role of the cGAS-STING pathway to liver diseases. Emerging evidence indicates that overactivation of cGAS-STING may contribute to the development of liver disorders, implying that the cGAS-STING pathway is a promising therapeutic target. Here, we review and discuss the role of the cGAS-STING DNA-sensing signaling pathway in a variety of liver diseases, including viral hepatitis, nonalcoholic fatty liver disease (NAFLD), alcoholic liver disease (ALD), primary hepatocellular cancer (HCC), and hepatic ischemia-reperfusion injury (IRI), with highlights on currently available therapeutic options.
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Affiliation(s)
- Dongwei Xu
- The Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA, United States
- Department of Liver Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yizhu Tian
- The Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA, United States
| | - Qiang Xia
- Department of Liver Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Bibo Ke
- The Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA, United States
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Lee KA, Robbins PD, Camell CD. Intersection of immunometabolism and immunosenescence during aging. Curr Opin Pharmacol 2021; 57:107-116. [PMID: 33684669 DOI: 10.1016/j.coph.2021.01.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 01/17/2021] [Accepted: 01/27/2021] [Indexed: 12/15/2022]
Abstract
Aging is associated with the highest risk for morbidity and mortality to chronic or metabolic diseases, which are present in 50% of the elderly. Improving metabolic and immune function of the elderly would improve quality of life and reduce the risk for all other diseases. Tissue-resident macrophages and the NLRP3 inflammasome are established drivers of inflammaging and metabolic dysfunction. Energy-sensing signaling pathways connect sterile and metabolic inflammation with cellular senescence and tissue dysfunction. We discuss recent advances in the immunometabolism field. Common themes revealed by recent publications include the alterations in metabolic signaling (SIRTUIN, AMPK, or mTOR pathways) in aged immune cells, the impact of senescence on inflammaging and tissue dysfunction, and the age-related changes in metabolic tissues, especially adipose tissue, as an immunological organ. Promising gerotherapeutics are candidates to broadly target nutrient and energy sensing, inflammatory and senescence pathways, and have potential to improve healthspan and treat age-related diseases.
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Affiliation(s)
- Kyoo-A Lee
- Institute on the Biology of Aging and Metabolism, Department of Biochemistry, Molecular Biology and Biophysics, 4-108 Nils Hasselmo Hall, University of Minnesota, Minneapolis, MN, USA
| | - Paul D Robbins
- Institute on the Biology of Aging and Metabolism, Department of Biochemistry, Molecular Biology and Biophysics, 4-108 Nils Hasselmo Hall, University of Minnesota, Minneapolis, MN, USA
| | - Christina D Camell
- Institute on the Biology of Aging and Metabolism, Department of Biochemistry, Molecular Biology and Biophysics, 4-108 Nils Hasselmo Hall, University of Minnesota, Minneapolis, MN, USA.
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Luo Y, Huang Z, Mou T, Pu J, Li T, Li Z, Yang H, Yan P, Wu Z, Wu Q. SET8 mitigates hepatic ischemia/reperfusion injury in mice by suppressing MARK4/NLRP3 inflammasome pathway. Life Sci 2021; 273:119286. [PMID: 33662429 DOI: 10.1016/j.lfs.2021.119286] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 02/22/2021] [Accepted: 02/22/2021] [Indexed: 02/06/2023]
Abstract
AIMS Hepatic ischemia/reperfusion (I/R) injury is a critical factor affecting the prognosis of liver surgery. The aim of this study is to explore the effects of SET8 on hepatic I/R injury and the putative mechanisms. MAIN METHODS The expression of SET8 and MARK4 in I/R group and sham group were detected both in vivo and in vitro. In addition, mouse and RAW 264.7 cells were transfected with MARK4 siRNA and SET8 siRNA knockdown of MARK4 and SET8, respectively. The expression of SET8, MARK4 and NLRP3-associated proteins were detected after different treatments. The pathology of liver and the serologic detection were detected after different treatments. KEY FINDINGS Our present study identified SET domain-containing protein 8 (SET8) as an efficient protein, which can negatively regulate hepatic I/R-mediated inflammatory response and ameliorate hepatic I/R injury by suppressing microtubule affinity-regulating kinase 4 (MARK4)/ NLR family pyrin domain containing 3 (NLRP3) inflammasome pathway. The data showed that MARK4 deficiency inhibited hypoxia/reoxygenation (H/R)-induced NLRP3 inflammasome activation, while SET8 deficiency showed the opposite effect. We further demonstrated that SET8 restrained NLRP3 inflammasome activation by inhibiting MARK4. Moreover, we verified SET8 made protective effect on hepatic I/R injury. SIGNIFICANCE SET8 plays an essential role in hepatic ischemia/reperfusion injury in mice by suppressing MARK4/NLRP3 inflammasome pathway. Our results may offer a new strategy to mitigate hepatic I/R injury.
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Affiliation(s)
- Yunhai Luo
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zuotian Huang
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Tong Mou
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Junliang Pu
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Tingting Li
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zhongtang Li
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Hang Yang
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Ping Yan
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zhongjun Wu
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Qiao Wu
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
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Shi Y, Su W, Zhang L, Shi C, Zhou J, Wang P, Wang H, Shi X, Wei S, Wang Q, Auwerx J, Schoonjans K, Yu Y, Pan R, Zhou H, Lu L. TGR5 Regulates Macrophage Inflammation in Nonalcoholic Steatohepatitis by Modulating NLRP3 Inflammasome Activation. Front Immunol 2021; 11:609060. [PMID: 33692776 PMCID: PMC7937818 DOI: 10.3389/fimmu.2020.609060] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 12/30/2020] [Indexed: 12/30/2022] Open
Abstract
Nonalcoholic steatohepatitis (NASH) is a chronic liver disease associated with dysregulation of liver metabolism and inflammation. G-protein coupled bile acid receptor 1 (TGR5) is a cell surface receptor that is involved in multiple metabolic pathways. However, the functions of TGR5 in regulating macrophage innate immune activation in NASH remain unclear. Here, we found that TGR5 expression was decreased in liver tissues from humans and mice with NASH. Compared to wild type (WT) mice, TGR5-knockout (TGR5−/−) mice exhibited exacerbated liver damage, increased levels of proinflammatory factors, and enhanced M1 macrophage polarization. Moreover, TGR5 deficiency facilitated M1 macrophage polarization by promoting NLRP3 inflammasome activation and caspase-1 cleavage. Taken together, our findings revealed that TGR5 signaling attenuated liver steatosis and inflammation and inhibited NLRP3-mediated M1 macrophage polarization in NASH.
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Affiliation(s)
- Yong Shi
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Wantong Su
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Lei Zhang
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Chengyu Shi
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Jinren Zhou
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Peng Wang
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Hao Wang
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Xiaoli Shi
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Song Wei
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Qi Wang
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Johan Auwerx
- Metabolic Signaling, School of Life Sciences, Institute of Bioengineering, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Kristina Schoonjans
- Metabolic Signaling, School of Life Sciences, Institute of Bioengineering, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Yue Yu
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Rui Pan
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China
| | - Haoming Zhou
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
| | - Ling Lu
- Jiangsu Key Laboratory of Molecular and Translational Cancer Research, The Affiliated Cancer Hospital (Jiangsu Cancer Hospital), Nanjing Medical University, Nanjing, China.,Hepatobiliary Center, The First Affiliated Hospital of Nanjing Medical University & Research Unit of Liver Transplantation and Transplant Immunology, Chinese Academy of Medical Sciences, Nanjing, China.,State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, China
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72
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Kumar V. The Trinity of cGAS, TLR9, and ALRs Guardians of the Cellular Galaxy Against Host-Derived Self-DNA. Front Immunol 2021; 11:624597. [PMID: 33643304 PMCID: PMC7905024 DOI: 10.3389/fimmu.2020.624597] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Accepted: 12/29/2020] [Indexed: 12/15/2022] Open
Abstract
The immune system has evolved to protect the host from the pathogens and allergens surrounding their environment. The immune system develops in such a way to recognize self and non-self and develops self-tolerance against self-proteins, nucleic acids, and other larger molecules. However, the broken immunological self-tolerance leads to the development of autoimmune or autoinflammatory diseases. Pattern-recognition receptors (PRRs) are expressed by immunological cells on their cell membrane and in the cytosol. Different Toll-like receptors (TLRs), Nod-like receptors (NLRs) and absent in melanoma-2 (AIM-2)-like receptors (ALRs) forming inflammasomes in the cytosol, RIG (retinoic acid-inducible gene)-1-like receptors (RLRs), and C-type lectin receptors (CLRs) are some of the PRRs. The DNA-sensing receptor cyclic GMP–AMP synthase (cGAS) is another PRR present in the cytosol and the nucleus. The present review describes the role of ALRs (AIM2), TLR9, and cGAS in recognizing the host cell DNA as a potent damage/danger-associated molecular pattern (DAMP), which moves out to the cytosol from its housing organelles (nucleus and mitochondria). The introduction opens with the concept that the immune system has evolved to recognize pathogens, the idea of horror autotoxicus, and its failure due to the emergence of autoimmune diseases (ADs), and the discovery of PRRs revolutionizing immunology. The second section describes the cGAS-STING signaling pathway mediated cytosolic self-DNA recognition, its evolution, characteristics of self-DNAs activating it, and its role in different inflammatory conditions. The third section describes the role of TLR9 in recognizing self-DNA in the endolysosomes during infections depending on the self-DNA characteristics and various inflammatory diseases. The fourth section discusses about AIM2 (an ALR), which also binds cytosolic self-DNA (with 80–300 base pairs or bp) that inhibits cGAS-STING-dependent type 1 IFN generation but induces inflammation and pyroptosis during different inflammatory conditions. Hence, this trinity of PRRs has evolved to recognize self-DNA as a potential DAMP and comes into action to guard the cellular galaxy. However, their dysregulation proves dangerous to the host and leads to several inflammatory conditions, including sterile-inflammatory conditions autoinflammatory and ADs.
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Affiliation(s)
- Vijay Kumar
- Children's Health Queensland Clinical Unit, School of Clinical Medicine, Faculty of Medicine, Mater Research, University of Queensland, St. Lucia, Brisbane, QLD, Australia.,School of Biomedical Sciences, Faculty of Medicine, University of Queensland, St. Lucia, Brisbane, QLD, Australia
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73
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Abstract
STING (stimulator of interferon genes) also known as transmembrane protein 173 (TMEM173) is a cytoplasmic DNA sensor which can be activated by the upstream cyclic dinucleotides (CDNs). This activation produces cytokines such as interferons and pro-inflammatory factors via the downstream IRF3 and NF-κB pathways, triggering an innate immune response and adaptive immunity to maintain homeostasis. STING is mainly expressed and activated in non-parenchymal cells, thus exerting a corresponding effect to maintain the homeostasis of the liver. In viral hepatitis, interferons and pro-inflammatory factors produced after STING activation initiate the immune response to inhibit virus replication and assembly. In the case of metabolic diseases of the liver, the activation of STING in kupffer cells and hepatic stellate cells leads to inflammation, the proliferation of connective tissue, and metabolic disorders in the hepatocytes, promoting the occurrence and development of the disease. In hepatocellular carcinoma, STING has two contradictory roles. When STING is activated in dendritic cells and macrophages, a large number of cytokines can be produced to initiate innate immune effects directly and to exert adaptive immunity through the recruitment and activation of T cells; however, aberrant activation of the STING pathway leads to a weakening of immune function and promotes oncogenesis and metastasis. Here, we summarize the interactions between STING and liver disease that have currently been identified and how to achieve therapeutic goals by modulating the activity of the STING pathway.
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74
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Ning L, Wei W, Wenyang J, Rui X, Qing G. Cytosolic DNA-STING-NLRP3 axis is involved in murine acute lung injury induced by lipopolysaccharide. Clin Transl Med 2020; 10:e228. [PMID: 33252860 PMCID: PMC7668192 DOI: 10.1002/ctm2.228] [Citation(s) in RCA: 133] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 10/26/2020] [Accepted: 10/30/2020] [Indexed: 12/16/2022] Open
Abstract
The role of NOD-like receptor protein 3 (NLRP3)-mediated pyroptosis in acute lung injury (ALI) has been well identified previously. Stimulator of interferon genes (STING) is an indispensable adaptor protein, which could regulate inflammation and pyroptosis during infection; however, its role in lipopolysaccharide (LPS)-induced ALI remains obscure. This study aimed to explore whether STING participated in the development of LPS-induced ALI as well as the underlying mechanism. We confirmed that LPS significantly enhanced the expression and phosphorylation of STING in lung tissue and primary macrophages from mice. STING deficiency relieved inflammation and oxidative stress in LPS-treated murine lungs and macrophages. Meanwhile, STING deficiency also abolished the activation of NLRP3 inflammasome and pyroptosis; however, NLRP3 overexpression by adenovirus offset the beneficial effects of STING deficiency in macrophages treated with LPS. Additionally, the level of mitochondrial DNA (mt-DNA) significantly increased in macrophages after LPS treatment. Intriguingly, although exogenous mt-DNA stimulation did not influence the level of STING, it could still trigger the phosphorylation of STING as well as pyroptosis, inflammation, and oxidative stress of macrophages. And the adverse effects induced by mt-DNA could be offset after STING was knocked out. Furthermore, the inhibition of the sensory receptor of cytosolic DNA (cyclic GMP-AMP synthase, cGAS) also blocked the activation of STING and NLRP3 inflammasome, meanwhile, it alleviated ALI without affecting the expression of STING after LPS challenge. Furthermore, cGAS inhibition also blocked the production of cGAMP induced by LPS, indicating that mt-DNA and cGAS could activate STING-NLRP3-mediated pyroptosis independent of the expression of STING. Finally, we found that LPS upregulated the expression of transcription factor c-Myc, which subsequently enhanced the activity of STING promoter and promoted its expression without affecting its phosphorylation. Collectively, our study disclosed that LPS could activate STING in a cytosolic DNA-dependent manner and upregulate the expression of STING in a c-Myc-dependent manner, which cooperatively contribute to ALI.
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Affiliation(s)
- Li Ning
- Department of Thoracic SurgeryRenmin Hospital of Wuhan UniversityWuhanChina
| | - Wang Wei
- Department of Thoracic SurgeryRenmin Hospital of Wuhan UniversityWuhanChina
| | - Jiang Wenyang
- Department of Thoracic SurgeryRenmin Hospital of Wuhan UniversityWuhanChina
| | - Xiong Rui
- Department of Thoracic SurgeryRenmin Hospital of Wuhan UniversityWuhanChina
| | - Geng Qing
- Department of Thoracic SurgeryRenmin Hospital of Wuhan UniversityWuhanChina
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75
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Zhong W, Rao Z, Rao J, Han G, Wang P, Jiang T, Pan X, Zhou S, Zhou H, Wang X. Aging aggravated liver ischemia and reperfusion injury by promoting STING-mediated NLRP3 activation in macrophages. Aging Cell 2020; 19:e13186. [PMID: 32666684 PMCID: PMC7431827 DOI: 10.1111/acel.13186] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 04/29/2020] [Accepted: 06/06/2020] [Indexed: 12/19/2022] Open
Abstract
Although aggravated liver injury has been reported in aged livers post‐ischemia and reperfusion (IR), the underlying mechanism of innate immune activation of aged macrophages is not well understood. Here, we investigated whether and how Stimulator of interferon genes (STING) signaling regulated macrophage proinflammatory activation and liver IR injury. Mice were subjected to hepatic IR in vivo. Macrophages isolated from IR‐stressed livers and bone marrow‐derived macrophages (BMDMs) from young and aged mice were used for in vitro studies. Enhanced nucleotide‐binding domain and leucine‐rich repeat containing protein 3 (NLRP3) activation was found in both livers and macrophages of aged mice post‐IR. NLRP3 knockdown in macrophages inhibited intrahepatic inflammation and liver injury in both young and aged mice. Interestingly, enhanced activation of the STING/ TANK‐binding kinase 1 (TBK1) signaling pathway was observed in aged macrophages post‐IR and mitochondria DNA (mtDNA) stimulation. STING suppression blocked over‐activation of NLRP3 signaling and excessive secretion of proinflammatory cytokines/chemokines in the mtDNA‐stimulated BMDMs from aged mice. More importantly, STING knockdown in macrophages abrogated the detrimental role of aging in aggravating liver IR injury and intrahepatic inflammation. Finally, peripheral blood from the recipients undergoing liver transplantation was collected and analyzed. The results showed that the elderly recipients had much higher levels of TNF‐α, IL‐6, IL‐1β, and IL‐18 post‐transplantation, indicating increased NLRP3 activation in lR‐stressed livers of elderly recipients. In summary, our study demonstrated that the STING‐NLRP3 axis was critical for the proinflammatory response of aged macrophages and would be a novel therapeutic target to reduce IR injury in elderly patients.
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Affiliation(s)
- Weizhe Zhong
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital with Nanjing Medical University Nanjing China
- Research Unit of Liver Transplantation and Transplant Immunology Chinese Academy of Medical Sciences Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
| | - Zhuqing Rao
- Department of Anesthesiology The First Affiliated Hospital with Nanjing Medical University Nanjing China
| | - Jianhua Rao
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital with Nanjing Medical University Nanjing China
- Research Unit of Liver Transplantation and Transplant Immunology Chinese Academy of Medical Sciences Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
| | - Guoyong Han
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital with Nanjing Medical University Nanjing China
- Research Unit of Liver Transplantation and Transplant Immunology Chinese Academy of Medical Sciences Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
| | - Ping Wang
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital with Nanjing Medical University Nanjing China
- Research Unit of Liver Transplantation and Transplant Immunology Chinese Academy of Medical Sciences Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
| | - Tao Jiang
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital with Nanjing Medical University Nanjing China
- Research Unit of Liver Transplantation and Transplant Immunology Chinese Academy of Medical Sciences Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
| | - Xiongxiong Pan
- Department of Anesthesiology The First Affiliated Hospital with Nanjing Medical University Nanjing China
| | - Shun Zhou
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital with Nanjing Medical University Nanjing China
- Research Unit of Liver Transplantation and Transplant Immunology Chinese Academy of Medical Sciences Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
| | - Haoming Zhou
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital with Nanjing Medical University Nanjing China
- Research Unit of Liver Transplantation and Transplant Immunology Chinese Academy of Medical Sciences Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
| | - Xuehao Wang
- Hepatobiliary/Liver Transplantation Center The First Affiliated Hospital with Nanjing Medical University Nanjing China
- Research Unit of Liver Transplantation and Transplant Immunology Chinese Academy of Medical Sciences Nanjing China
- Key Laboratory of Liver Transplantation Chinese Academy of Medical Sciences Nanjing China
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