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Hunt BG, Fox LH, Davis JC, Jones A, Lu Z, Waltz SE. An Introduction and Overview of RON Receptor Tyrosine Kinase Signaling. Genes (Basel) 2023; 14:517. [PMID: 36833444 PMCID: PMC9956929 DOI: 10.3390/genes14020517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/07/2023] [Accepted: 02/16/2023] [Indexed: 02/22/2023] Open
Abstract
RON is a receptor tyrosine kinase (RTK) of the MET receptor family that is canonically involved in mediating growth and inflammatory signaling. RON is expressed at low levels in a variety of tissues, but its overexpression and activation have been associated with malignancies in multiple tissue types and worse patient outcomes. RON and its ligand HGFL demonstrate cross-talk with other growth receptors and, consequentially, positions RON at the intersection of numerous tumorigenic signaling programs. For this reason, RON is an attractive therapeutic target in cancer research. A better understanding of homeostatic and oncogenic RON activity serves to enhance clinical insights in treating RON-expressing cancers.
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Affiliation(s)
- Brian G. Hunt
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Levi H. Fox
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - James C. Davis
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Angelle Jones
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Zhixin Lu
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Susan E. Waltz
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
- Research Service, Cincinnati Veterans Affairs Hospital Medical Center, Cincinnati, OH 45220, USA
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2
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Liu J, Zhang L, Xu F, Meng S, Li H, Song Y. Polystyrene Microplastics Postpone APAP-Induced Liver Injury through Impeding Macrophage Polarization. TOXICS 2022; 10:792. [PMID: 36548625 PMCID: PMC9781384 DOI: 10.3390/toxics10120792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/11/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
Polystyrene microplastics (PS MPs) are micrometer-scale items degraded from plastics and have been detected in various organisms. PS MPs have been identified as causing cognitive, cardiac, intestinal, and hepatic damage. However, their role in liver regeneration under drug-induced liver injury remains unknown. Thus, the current study aims to evaluate the impact of PS MPs on liver repair during APAP hepatotoxicity. PS MPs pretreatment exacerbates mice mortality and hepatocyte apoptosis, suppresses hepatic cell proliferation, and disturbs the inflammatory response in the APAP-induced damage model. Further mechanism exploration uncovers that prior PS MPs administration is sufficient to recruit neutrophils and macrophages, which are necessary for tissue recovery in the acute liver injury model. However, the polarization capacity of macrophages to anti-inflammatory sub-type is significantly delayed in PS MPs plus APAP group compared to the single APAP group, which is the leading cause of tissue repair suppression. Overall, the current study supports a new insight to realize the toxicity of PS MPs in acute liver injury, which should be considered in health risk assessment.
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Affiliation(s)
- Jing Liu
- College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
- The Institute of Karst Wetland Ecology, Guizhou Minzu University, Guiyang 550025, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Lecong Zhang
- College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
| | - Fang Xu
- College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Songyan Meng
- College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
| | - Haitian Li
- College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
| | - Yang Song
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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3
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CD5L deficiency attenuate acetaminophen-induced liver damage in mice via regulation of JNK and ERK signaling pathway. Cell Death Dis 2021; 7:342. [PMID: 34750342 PMCID: PMC8575892 DOI: 10.1038/s41420-021-00742-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 10/19/2021] [Accepted: 10/27/2021] [Indexed: 11/09/2022]
Abstract
CD5 molecule like (CD5L), a member of the scavenger receptor cysteine-rich domain superfamily, plays a critical role in immune homeostasis and inflammatory disease. Acetaminophen (APAP) is a safe and effective antipyretic analgesic. However, overdose may cause liver damage or even liver failure. APAP hepatotoxicity is characterized by extensive necrotic cell death and a sterile inflammatory response, in which the role of CD5L remains to be investigated. In this study, we found that the expression of CD5L was increased in the livers of mice after APAP overdose. Furthermore, CD5L deficiency reduced the increase of alanine transaminase (ALT) level, histopathologic lesion area, c-Jun N-terminal kinase (JNK)/extracellular signal-regulated kinase (ERK) phosphorylation level, Transferase-Mediated dUTP Nick End-Labeling positive (TUNEL+) cells proportion, vascular endothelial cell permeability and release of inflammatory cytokines induced by excess APAP. Therefore, our findings reveal that CD5L may be a potential therapeutic target for prevention and treatment of APAP-induced liver injury.
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4
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Song B, Zhang C, Hu W, Guo C, Xia Z, Hu W, Qin M, Jiang W, Lv J, Xu D, Zhang S, Fang J. Nano-designed carbon monoxide donor SMA/CORM2 exhibits protective effect against acetaminophen induced liver injury through macrophage reprograming and promoting liver regeneration. J Control Release 2021; 331:350-363. [PMID: 33482271 DOI: 10.1016/j.jconrel.2021.01.025] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 12/17/2020] [Accepted: 01/11/2021] [Indexed: 02/07/2023]
Abstract
Acetaminophen (APAP) induced liver injury is the most common drug-induced liver injury, accounting for the top cause of acute liver failure in the United State, however the therapeutic options for it is very limited. Excess generation of reactive oxygen species (ROS) and the subsequent inflammatory responses are the major factors of the liver injury. Carbon monoxide (CO) is an important gaseous molecule with versatile functions including anti-oxidation and anti-inflammation, and we previous reported the therapeutic potential of a nano-designed CO donor SMA/CORM2 in a dextran sulphate sodium (DSS) induced mouse colitis model. In this context, we investigated the effect of SMA/CORM2 in an APAP-induced mouse acute liver injury model and tackled the mechanisms involved. We found upregulation of heme oxygenase-1 (HO-1, endogenous CO generating enzyme) and the dynamic changes of macrophage polarization (pro-inflammatory M1/anti-inflammatory M2), which played important roles in the process of live injury. SMA/CORM2 treatment remarkably increased the CO levels in the liver and circulation, by which oxidative stresses in the liver were significantly reduced, and more importantly, it remarkably suppressed the expression of M1 macrophages but alternatively increased M2 polarization. Consequently the liver injury was significantly ameliorated, and the proliferation and regeneration were greatly promoted through the Pi3k/Akt/mTOR signaling pathway. The shift of macrophage polarization accompanied with the downregulated hypoxia-inducible factor-1α (HIF-1α) level. These findings suggested CO released from SMA/CORM2 manipulated the macrophage reprogramming toward M2 phenotype by inhibiting HIF-1α, which subsequently protected liver against inflammatory injury and benefited tissue repair. Moreover, compared to native CORM2, SMA/CORM2 exhibited superior bioavailability and protective effect. We thus anticipate the application of SMA/CORM2 as a therapeutic regimen for APAP induced liver injury as well as other inflammatory diseases and disorders.
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Affiliation(s)
- Bingdong Song
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China
| | - Cheng Zhang
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China
| | - Weirong Hu
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China
| | - Chunyu Guo
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China
| | - Zhengmei Xia
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China
| | - Wanxia Hu
- School of Health Management, Anhui Medical University, No.81, MeiShan Road, Hefei 230032, Anhui, China
| | - Mingqiang Qin
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China; The Fourth Affiliated Hospital, Anhui Medical University, Hefei 230022, China
| | - Weiying Jiang
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China; The Fourth Affiliated Hospital, Anhui Medical University, Hefei 230022, China
| | - Jinwei Lv
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China
| | - Dexiang Xu
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China
| | - Shichen Zhang
- Department of Maternal, Child and Adolescent Health, School of Public Health, Anhui Medical University, Hefei 230022, China; MOE Key Laboratory of Population Health Across Life Cycle / Anhui Provincial Key Laboratory of Population Health and Aristogenics, No. 81 Meishan Road, Hefei 230032, China.
| | - Jun Fang
- Department of Toxicology, School of Public Health, Anhui Medical University, No. 81 Meishan Road, Hefei 230032, China; Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, School of Public Health, Anhui Medical University, Hefei 230022, China; Faculty of Pharmaceutical Science, Sojo University, Ikeda 4-22-1, Kumamoto 860-0082, Japan.
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5
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Gao RY, Wang M, Liu Q, Feng D, Wen Y, Xia Y, Colgan SP, Eltzschig HK, Ju C. Hypoxia-Inducible Factor-2α Reprograms Liver Macrophages to Protect Against Acute Liver Injury Through the Production of Interleukin-6. Hepatology 2020; 71:2105-2117. [PMID: 31529728 PMCID: PMC7075728 DOI: 10.1002/hep.30954] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 09/04/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND AND AIMS Acetaminophen (APAP) overdose represents the most frequent cause of acute liver failure, resulting in death or liver transplantation in more than one third of patients in the United States. The effectiveness of the only antidote, N-acetylcysteine, declines rapidly after APAP ingestion, long before patients are admitted to the clinic with symptoms of severe liver injury. The direct hepatotoxicity of APAP triggers a cascade of innate immune responses that may exacerbate or limit the progression of tissue damage. A better understanding of this complex mechanism will help uncover targets for therapeutic interventions. APPROACH AND RESULTS We observed that APAP challenge caused stabilization of hypoxia-inducible factors (HIFs) in the liver and hepatic macrophages (MΦs), particularly HIF-2α. Genetic deletion of the HIF-2α gene in myeloid cells (HIF-2αmye/- ) markedly exacerbated APAP-induced liver injury (AILI) without affecting APAP bioactivation and detoxification. In contrast, hepatic and serum levels of the hepatoprotective cytokine interleukin 6 (IL-6), its downstream signal transducer and transcription factor 3 activation in hepatocytes, as well as hepatic MΦ IL-6 expression were markedly reduced in HIF-2αmye/- mice compared to wild-type mice post-APAP challenge. In vitro experiments revealed that hypoxia induced IL-6 production in hepatic MΦs and that such induction was abolished in HIF-2α-deleted hepatic MΦs. Restoration of IL-6 by administration of exogenous IL-6 ameliorated AILI in HIF-2αmye/- mice. Finally, IL-6-mediated hepatoprotection against AILI was abolished in hepatocyte-specific IL-6 receptor knockout mice. CONCLUSIONS The data demonstrate that APAP treatment leads to HIF-2α stabilization in hepatic MΦs and that HIF-2α subsequently reprograms hepatic MΦs to produce the hepatoprotective cytokine IL-6, thereby ameliorating AILI.
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Affiliation(s)
- Rachel Y. Gao
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Meng Wang
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,Department of Anesthesiology, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Qihui Liu
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,Current address: Biomedical Institute, Zhuhai People’s Hospital, Jinan University, Zhuhai, Guangdong, China
| | - Dechun Feng
- Laboratory of Liver Disease, NIAAA, NIH, Bethesda, MD, USA
| | - Yankai Wen
- Department of Anesthesiology, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Yang Xia
- Department of Biochemistry and Molecular Biology, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Sean P. Colgan
- Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Holger K. Eltzschig
- Department of Anesthesiology, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Cynthia Ju
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,Department of Anesthesiology, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, USA.,Correspondence should be addressed to C. J. ()
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6
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Dogaru G, Bulboaca AE, Gheban D, Boarescu PM, Rus V, Festila D, Sitar-Taut AV, Stanescu I. Effect of Liposomal Curcumin on Acetaminophen Hepatotoxicity by Down-regulation of Oxidative Stress and Matrix Metalloproteinases. In Vivo 2020; 34:569-582. [PMID: 32111755 PMCID: PMC7157894 DOI: 10.21873/invivo.11809] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/02/2019] [Accepted: 12/03/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND/AIM The hepatoprotective role of various molecules in drug-induced hepatotoxicity arouses great interest. We investigated the effect of liposomal curcumin (LCC) on experimental acetaminophen (APAP)-induced hepatotoxicity. MATERIALS AND METHODS Rats were randomly allocated into 5 groups, and the effect of two LCC concentrations was studied: group 1 - 1 ml intraperitoneal (i.p.) saline, group 2 - APAP pretreatment, group 3 - APAP+silymarin (extract of the silybum marianum with anti-inflammatory, anti-oxidant, and anti-fibrotic properties), group 4 - APAP+LCC1, group 5 - APAP+LCC2. The biomarkers of oxidative stress (nitric oxide and malondialdehyde) and antioxidant status of plasma (thiols and catalase), TNF-α, MMP-2 and MMP-9 serum levels were evaluated. RESULTS An improvement in oxidative stress, antioxidant status, and TNF-α, MMP-2 and MMP-9 levels was obtained in groups pretreated with LCC compared to silymarin treatment, in a dose-dependent manner. Histopathological examination reinforced the results. CONCLUSION Liposomal curcumin improves the oxidative stress/antioxidant balance and alleviates inflammation in experimental APAP-induced hepatotoxicity.
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Affiliation(s)
- Gabriela Dogaru
- Department of Medical Rehabilitation, "Iuliu Haţieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Adriana Elena Bulboaca
- Department of Pathophysiology, "Iuliu Haţieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Dan Gheban
- Department of Pathological Anatomy, "Iuliu Haţieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Paul Mihai Boarescu
- Department of Pathophysiology, "Iuliu Haţieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Vasile Rus
- Department of Cell Biology, Histology and Embryology, University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, Romania
| | - Dana Festila
- Department of Orthodontics, "Iuliu Haţieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Adela-Viviana Sitar-Taut
- Department of Internal Medicine, "Iuliu Haţieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Ioana Stanescu
- Department of Neurology, "Iuliu Haţieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
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7
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Babicky ML, Harper MM, Chakedis J, Cazes A, Mose ES, Jaquish DV, French RP, Childers B, Alakus H, Schmid MC, Foubert P, Miyamoto J, Holman PJ, Walterscheid ZJ, Tang CM, Varki N, Sicklick JK, Messer K, Varner JA, Waltz SE, Lowy AM. MST1R kinase accelerates pancreatic cancer progression via effects on both epithelial cells and macrophages. Oncogene 2019; 38:5599-5611. [PMID: 30967626 PMCID: PMC6625868 DOI: 10.1038/s41388-019-0811-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 03/20/2019] [Accepted: 03/20/2019] [Indexed: 12/20/2022]
Abstract
The MST1R (RON) kinase is overexpressed in >80% of human pancreatic cancers, but its role in pancreatic carcinogenesis is unknown. In this study, we examined the relevance of Mst1r kinase to Kras driven pancreatic carcinogenesis using genetically engineered mouse models. In the setting of mutant Kras, Mst1r overexpression increased acinar-ductal metaplasia (ADM), accelerated progression of pancreatic intraepithelial neoplasia (PanIN), and resulted in the accumulation of (mannose receptor C type 1) MRC1+, (arginase 1) Arg+ macrophages in the tumor microenvironment. Conversely, absence of a functional Mst1r kinase slowed PanIN initiation, resulted in smaller tumors, prolonged survival and a reduced tumor associated macrophage content. Mst1r expression was associated with increased production of its ligand Mst1, and in orthotopic models, suppression of Mst1 expression resulted in reduced tumor size, changes in macrophage polarization and enhanced T cell infiltration. This study demonstrates the functional significance of Mst1r during pancreatic cancer initiation and progression. Further, it provides proof of concept that targeting Mst1r can modulate pancreatic cancer growth and the microenvironment. This study provides further rationale for targeting Mst1r as a therapeutic strategy.
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Affiliation(s)
- Michele L Babicky
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Megan M Harper
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Jeffery Chakedis
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Alex Cazes
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Evangeline S Mose
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Dawn V Jaquish
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Randall P French
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Betzaira Childers
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Hakan Alakus
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Michael C Schmid
- Department of Pathology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Phillippe Foubert
- Department of Pathology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Jaclyn Miyamoto
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Patrick J Holman
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Zakkary J Walterscheid
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Chih-Min Tang
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Nissi Varki
- Department of Family Medicine and Epidemiology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Jason K Sicklick
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Karen Messer
- Department of Family Medicine and Epidemiology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Judith A Varner
- Department of Pathology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Susan E Waltz
- Department of Cancer Biology, University of Cincinnati College of Medicine, and Research Service, Cincinnati Veteran's Administration Medical Center, Cincinnati, OH, 45267, USA
| | - Andrew M Lowy
- Division of Surgical Oncology, Department of Surgery, University of California, San Diego, La Jolla, CA, 92093, USA.
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8
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Neutrophils promote the development of reparative macrophages mediated by ROS to orchestrate liver repair. Nat Commun 2019; 10:1076. [PMID: 30842418 PMCID: PMC6403250 DOI: 10.1038/s41467-019-09046-8] [Citation(s) in RCA: 211] [Impact Index Per Article: 42.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 02/07/2019] [Indexed: 12/13/2022] Open
Abstract
Phagocytes, including neutrophils and macrophages, have been suggested to function in a cooperative way in the initial phase of inflammatory responses, but their interaction and integration in the resolution of inflammation and tissue repair remain unclear. Here we show that neutrophils have crucial functions in liver repair by promoting the phenotypic conversion of pro-inflammatory Ly6ChiCX3CR1lo monocytes/macrophages to pro-resolving Ly6CloCX3CR1hi macrophages. Intriguingly, reactive oxygen species (ROS), expressed predominantly by neutrophils, are important mediators that trigger this phenotypic conversion to promote liver repair. Moreover, this conversion is prevented by the depletion of neutrophils via anti-Ly6G antibody, genetic deficiency of granulocyte colony-stimulating factor, or genetic deficiency of NADPH oxidase 2 (Nox2). By contrast, adoptive transfer of WT rather than Nox2−/− neutrophils rescues the impaired phenotypic conversion of macrophages in neutrophil-depleted mice. Our findings thus identify an intricate cooperation between neutrophils and macrophages that orchestrate resolution of inflammation and tissue repair. Neutrophils and macrophages are both involved in the initiation of inflammation, but whether and how they may participate in inflammation resolution is unclear. Here the authors show that neutrophils may mediate the conversion of macrophage into a pro-resolution phenotype via reactive oxygen species production to promote liver repair.
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9
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Li J, Chanda D, van Gorp PJ, Jeurissen MLJ, Houben T, Walenbergh SMA, Debets J, Oligschlaeger Y, Gijbels MJJ, Neumann D, Shiri-Sverdlov R. Macrophage Stimulating Protein Enhances Hepatic Inflammation in a NASH Model. PLoS One 2016; 11:e0163843. [PMID: 27685150 PMCID: PMC5042385 DOI: 10.1371/journal.pone.0163843] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 09/15/2016] [Indexed: 01/16/2023] Open
Abstract
Non-alcoholic steatohepatitis (NASH) is a common liver disease characterized by hepatic lipid accumulation (steatosis) and inflammation. Currently, therapeutic options are poor and the long-term burden to society is constantly increasing. Previously, macrophage stimulating protein (MSP)—a serum protein mainly secreted by liver—was shown to inhibit oxidized low-density lipoprotein (OxLDL)/lipopolysaccharides (LPS)-induced inflammation in mouse macrophages. Additionally, MSP could reduce palmitic acid (PA)-induced lipid accumulation and lipogenesis in the HepG2 cell line. Altogether, these data suggest MSP as a suppressor for metabolic inflammation. However, so far the potential of MSP to be used as a treatment for NASH was not investigated. We hypothesized that MSP reduces lipid accumulation and hepatic inflammation. To investigate the effects of MSP in the early stage of NASH, low-density lipoprotein receptor (Ldlr-/-) mice were fed either a regular chow or a high fat, high cholesterol (HFC) diet for 7 days. Recombinant MSP or saline (control) was administrated to the mice by utilizing subcutaneously-implanted osmotic mini-pumps for the last 4 days. As expected, mice fed an HFC diet showed increased plasma and hepatic lipid accumulation, as well as enhanced hepatic inflammation, compared with chow-fed controls. Upon MSP administration, the rise in cholesterol and triglyceride levels after an HFC diet remained unaltered. Surprisingly, while hepatic macrophage and neutrophil infiltration was similar between the groups, MSP-treated mice showed increased gene expression of pro-inflammatory and pro-apoptotic mediators in the liver, compared with saline-treated controls. Contrary to our expectations, MSP did not ameliorate NASH. Observed changes in inflammatory gene expression suggest that further research is needed to clarify the long-term effects of MSP.
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Affiliation(s)
- Jieyi Li
- Department of Molecular Genetics, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Dipanjan Chanda
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Patrick J. van Gorp
- Department of Molecular Genetics, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Mike L. J. Jeurissen
- Department of Molecular Genetics, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Tom Houben
- Department of Molecular Genetics, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Sofie M. A. Walenbergh
- Department of Molecular Genetics, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Jacques Debets
- Department of Pharmacology, Maastricht University, Maastricht, The Netherlands
| | - Yvonne Oligschlaeger
- Department of Molecular Genetics, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Marion J. J. Gijbels
- Department of Molecular Genetics, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
- Department of Medical Biochemistry and Experimental Vascular Biology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Dietbert Neumann
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Ronit Shiri-Sverdlov
- Department of Molecular Genetics, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
- * E-mail:
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10
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Yu S, Allen JN, Dey A, Zhang L, Balandaram G, Kennett MJ, Xia M, Xiong N, Peters JM, Patterson A, Hankey-Giblin PA. The Ron Receptor Tyrosine Kinase Regulates Macrophage Heterogeneity and Plays a Protective Role in Diet-Induced Obesity, Atherosclerosis, and Hepatosteatosis. THE JOURNAL OF IMMUNOLOGY 2016; 197:256-65. [DOI: 10.4049/jimmunol.1600450] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 04/13/2016] [Indexed: 12/11/2022]
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11
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Chitohexaose protects against acetaminophen-induced hepatotoxicity in mice. Cell Death Dis 2016; 7:e2224. [PMID: 27171266 PMCID: PMC4917664 DOI: 10.1038/cddis.2016.131] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 04/05/2016] [Accepted: 04/07/2016] [Indexed: 12/11/2022]
Abstract
Acetaminophen (N-acetyl-para-aminophenol (APAP)) toxicity causes acute liver failure by inducing centrilobular hepatic damage as a consequence of mitochondrial oxidative stress. Sterile inflammation, triggered by hepatic damage, facilitates gut bacterial translocation leading to systemic inflammation; TLR4-mediated activation by LPS has been shown to have a critical role in APAP-mediated hepatotoxicity. In this study, we demonstrate significant protection mediated by chitohexaose (Chtx) in mice challenged with a lethal dose of APAP (400 mg/kg b.w.). Decreased mortality by Chtx was associated with reduced hepatic damage, increased peritoneal migration of neutrophils, decreased mRNA expression of IL-1β as well as inhibition of inflammasome activation in liver. Further, an alternate mouse model of co-administration of a sublethal doses of APAP (200 mg/kg b.w.) and LPS (5 mg/kg b.w.) operating synergistically and mediating complete mortality was developed. Overwhelming inflammation, characterized by increased inflammatory cytokines (TNF-α, IL-1β and so on) in liver as well as in circulation and mortality was demonstrable in this model. Also, Chtx administration mediated significant reversal of mortality in APAP+LPS co-administered mice, which was associated with reduced IL-1β in liver and plasma cytokines in this model. In conclusion, Chtx being a small molecular weight linear carbohydrate offers promise for clinical management of liver failure associated with APAP overdose.
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12
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The spleen as an extramedullary source of inflammatory cells responding to acetaminophen-induced liver injury. Toxicol Appl Pharmacol 2016; 304:110-20. [PMID: 27163765 DOI: 10.1016/j.taap.2016.04.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Revised: 04/25/2016] [Accepted: 04/27/2016] [Indexed: 12/18/2022]
Abstract
Macrophages have been shown to play a role in acetaminophen (APAP)-induced hepatotoxicity, contributing to both pro- and anti-inflammatory processes. In these studies, we analyzed the role of the spleen as an extramedullary source of hepatic macrophages. APAP administration (300mg/kg, i.p.) to control mice resulted in an increase in CD11b(+) infiltrating Ly6G(+) granulocytic and Ly6G(-) monocytic cells in the spleen and the liver. The majority of the Ly6G(+) cells were also positive for the monocyte/macrophage activation marker, Ly6C, suggesting a myeloid derived suppressor cell (MDSC) phenotype. By comparison, Ly6G(-) cells consisted of 3 subpopulations expressing high, intermediate, and low levels of Ly6C. Splenectomy was associated with increases in mature (F4/80(+)) and immature (F4/80(-)) pro-inflammatory Ly6C(hi) macrophages and mature anti-inflammatory (Ly6C(lo)) macrophages in the liver after APAP; increases in MDSCs were also noted in the livers of splenectomized (SPX) mice after APAP. This was associated with increases in APAP-induced expression of chemokine receptors regulating pro-inflammatory (CCR2) and anti-inflammatory (CX3CR1) macrophage trafficking. In contrast, APAP-induced increases in pro-inflammatory galectin-3(+) macrophages were blunted in livers of SPX mice relative to control mice, along with hepatic expression of TNF-α, as well as the anti-inflammatory macrophage markers, FIZZ-1 and YM-1. These data demonstrate that multiple subpopulations of pro- and anti-inflammatory cells respond to APAP-induced injury, and that these cells originate from distinct hematopoietic reservoirs.
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13
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Fannin RD, Gerrish K, Sieber SO, Bushel PR, Watkins PB, Paules RS. Blood transcript immune signatures distinguish a subset of people with elevated serum ALT from others given acetaminophen. Clin Pharmacol Ther 2016; 99:432-41. [PMID: 26690555 DOI: 10.1002/cpt.328] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 11/11/2015] [Accepted: 12/04/2015] [Indexed: 12/14/2022]
Abstract
The diagnosis of drug-induced liver injury is hindered by the limited utility of clinical chemistries. We have shown that hepatotoxicants can produce peripheral blood transcriptome "signatures" (PBTS) in rodents and humans. In this study, 42 adults were treated with acetaminophen (APAP; 1 g every 6 hours) for seven days, followed by three days of placebo. Eleven subjects received only placebo. After five days, 12 subjects (30%) had increases in serum alanine aminotransferase (ALT) levels ("responders"). PBTS of 707 and 760 genes, respectively, could distinguish responders and nonresponders from placebos. Functional analysis of the responder PBTS revealed increased expression of genes involved in TH2-mediated and innate immune responses, whereas the nonresponders demonstrated increased gene expression consistent with a tolerogenic immune response. Taken together, these observations suggest that the clinical subjects with transient increases in serum ALT failed to maintain or intensify a hepatic tolerogenic immune response.
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Affiliation(s)
- R D Fannin
- National Institute of Environmental Health Sciences, Molecular Genomics Core, National Institute of Health, Research Triangle Park, North Carolina, USA
| | - K Gerrish
- National Institute of Environmental Health Sciences, Molecular Genomics Core, National Institute of Health, Research Triangle Park, North Carolina, USA
| | - S O Sieber
- National Institute of Environmental Health Sciences, Molecular Genomics Core, National Institute of Health, Research Triangle Park, North Carolina, USA
| | - P R Bushel
- National Institute of Environmental Health Sciences, Biostatistics and Computational Biology Branch, National Institute of Health, Research Triangle Park, North Carolina, USA
| | - P B Watkins
- Hamner - University of North Carolina Institute for Drug Safety Sciences, Research Triangle Park, North Carolina, USA
| | - R S Paules
- National Institute of Environmental Health Sciences, National Toxicology Program, Biomolecular Screening Branch, National Institute of Health, Research Triangle Park, North Carolina, USA
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14
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Krenkel O, Mossanen JC, Tacke F. Immune mechanisms in acetaminophen-induced acute liver failure. Hepatobiliary Surg Nutr 2015; 3:331-43. [PMID: 25568858 DOI: 10.3978/j.issn.2304-3881.2014.11.01] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 09/18/2014] [Indexed: 12/23/2022]
Abstract
An overdose of acetaminophen (N-acetyl-p-aminophenol, APAP), also termed paracetamol, can cause severe liver damage, ultimately leading to acute liver failure (ALF) with the need of liver transplantation. APAP is rapidly taken up from the intestine and metabolized in hepatocytes. A small fraction of the metabolized APAP forms cytotoxic mitochondrial protein adducts, leading to hepatocyte necrosis. The course of disease is not only critically influenced by dose of APAP and the initial hepatocyte damage, but also by the inflammatory response following acetaminophen-induced liver injury (AILI). As revealed by mouse models of AILI and corresponding translational studies in ALF patients, necrotic hepatocytes release danger-associated-molecular patterns (DAMPs), which are recognized by resident hepatic macrophages, Kupffer cell (KC), and neutrophils, leading to the activation of these cells. Activated hepatic macrophages release various proinflammatory cytokines, such as TNF-α or IL-1β, as well as chemokines (e.g., CCL2) thereby further enhancing inflammation and increasing the influx of immune cells, like bone-marrow derived monocytes and neutrophils. Monocytes are mainly recruited via their receptor CCR2 and aggravate inflammation. Infiltrating monocytes, however, can mature into monocyte-derived macrophages (MoMF), which are, in cooperation with neutrophils, also involved in the resolution of inflammation. Besides macrophages and neutrophils, distinct lymphocyte populations, especially γδ T cells, are also linked to the inflammatory response following an APAP overdose. Natural killer (NK), natural killer T (NKT) and T cells possibly further perpetuate inflammation in AILI. Understanding the complex interplay of immune cell subsets in experimental models and defining their functional involvement in disease progression is essential to identify novel therapeutic targets for human disease.
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Affiliation(s)
- Oliver Krenkel
- Department of Medicine III, RWTH-University Hospital Aachen, Aachen, Germany
| | - Jana C Mossanen
- Department of Medicine III, RWTH-University Hospital Aachen, Aachen, Germany
| | - Frank Tacke
- Department of Medicine III, RWTH-University Hospital Aachen, Aachen, Germany
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15
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Drug-induced hepatotoxicity: metabolic, genetic and immunological basis. Int J Mol Sci 2014; 15:6990-7003. [PMID: 24758937 PMCID: PMC4013674 DOI: 10.3390/ijms15046990] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 04/10/2014] [Accepted: 04/14/2014] [Indexed: 12/21/2022] Open
Abstract
Drug-induced hepatotoxicity is a significant cause of acute liver failure and is usually the primary reason that therapeutic drugs are removed from the commercial market. Multiple mechanisms can culminate in drug hepatotoxicity. Metabolism, genetics and immunology separately and in concert play distinct and overlapping roles in this process. This review will cover papers we feel have addressed these mechanisms of drug-induced hepatotoxicity in adults following the consumption of commonly used medications. The aim is to generate discussion around "trigger point" papers where the investigators generated new science or provided additional contribution to existing science. Hopefully these discussions will assist in uncovering key areas that need further attention.
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WANG KUNPENG, BAI YU, WANG JIAN, ZHANG JINZHEN. Inhibitory effects of Schisandra chinensis on acetaminophen-induced hepatotoxicity. Mol Med Rep 2014; 9:1813-9. [DOI: 10.3892/mmr.2014.2004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 02/18/2014] [Indexed: 11/06/2022] Open
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Curative Effects of Thiacremonone against Acetaminophen-Induced Acute Hepatic Failure via Inhibition of Proinflammatory Cytokines Production and Infiltration of Cytotoxic Immune Cells and Kupffer Cells. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:974794. [PMID: 23935693 PMCID: PMC3725907 DOI: 10.1155/2013/974794] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Accepted: 04/22/2013] [Indexed: 01/13/2023]
Abstract
High doses of acetaminophen (APAP; N-acetyl-p-aminophenol) cause severe hepatotoxicity after metabolic activation by cytochrome P450 2E1. This study was undertaken to examine the preventive effects of thiacremonone, a compound extracted from garlic, on APAP-induced acute hepatic failure in male C57BL/6J. Mice received with 500 mg/kg APAP after a 7-day pretreatment with thiacremonone (10–50 mg/kg). Thiacremonone inhibited the APAP-induced serum ALT and AST levels in a dose-dependent manner, and markedly reduced the restricted area of necrosis and inflammation by administration of APAP. Thiacremonone also inhibited the APAP-induced depletion of intracellular GSH, induction of nitric oxide, and lipid peroxidation as well as expression of P450 2E1. After APAP injection, the numbers of Kupffer cells, natural killer cells, and cytotoxic T cells were elevated, but the elevated cell numbers in the liver were reduced in thiacremonone pretreated mice. The expression levels of I-309, M-CSF, MIG, MIP-1α, MIP-1β, IL-7, and IL-17 were increased by APAP treatment, which were inhibited in thiacremonone pretreated mice. These data indicate that thiacremonone could be a useful agent for the treatment of drug-induced hepatic failure and that the reduction of cytotoxic immune cells as well as proinflammatory cytokine production may be critical for the prevention of APAP-induced acute liver toxicity.
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Dragomir ACD, Sun R, Choi H, Laskin JD, Laskin DL. Role of galectin-3 in classical and alternative macrophage activation in the liver following acetaminophen intoxication. THE JOURNAL OF IMMUNOLOGY 2012; 189:5934-41. [PMID: 23175698 DOI: 10.4049/jimmunol.1201851] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Inflammatory macrophages have been implicated in hepatotoxicity induced by the analgesic acetaminophen (APAP). In these studies, we characterized the phenotype of macrophages accumulating in the liver following APAP intoxication and evaluated the role of galectin-3 (Gal-3) in macrophage activation. Administration of APAP (300 mg/kg, i.p.) to wild-type mice resulted in the appearance of two distinct subpopulations of CD11b(+) cells in the liver, which expressed high or low levels of the monocyte/macrophage activation marker Ly6C. Whereas CD11b(+)/Ly6C(hi) macrophages exhibited a classically activated proinflammatory phenotype characterized by increased expression of TNF-α, inducible NO synthase, and CCR2, CD11b(+)/Ly6C(lo) macrophages were alternatively activated, expressing high levels of the anti-inflammatory cytokine IL-10. APAP intoxication was also associated with an accumulation of Gal-3(+) macrophages in the liver; the majority of these cells were Ly6C(hi). APAP-induced increases in CD11b(+)/Ly6C(hi) macrophages were significantly reduced in Gal-3(-/-) mice. This reduction was evident 72 h post APAP and was correlated with decreased expression of the classical macrophage activation markers, inducible NO synthase, IL-12, and TNF-α, as well as the proinflammatory chemokines CCL2 and CCL3, and chemokine receptors CCR1 and CCR2. Conversely, numbers of CD11b(+)/Ly6C(lo) macrophages increased in livers of APAP-treated Gal-3(-/-) mice; this was associated with increased expression of the alternative macrophage activation markers Ym1 and Fizz1, increased liver repair, and reduced hepatotoxicity. These data demonstrate that both classically and alternatively activated macrophages accumulate in the liver following APAP intoxication; moreover, Gal-3 plays a role in promoting a persistent proinflammatory macrophage phenotype.
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Affiliation(s)
- Ana-Cristina Docan Dragomir
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, NJ 08854, USA
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Liu Y, Gardner CR, Laskin JD, Laskin DL. Classical and alternative activation of rat hepatic sinusoidal endothelial cells by inflammatory stimuli. Exp Mol Pathol 2012; 94:160-7. [PMID: 23103612 DOI: 10.1016/j.yexmp.2012.10.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 10/17/2012] [Accepted: 10/18/2012] [Indexed: 12/16/2022]
Abstract
The ability of rat hepatic sinusoidal endothelial cells (HSEC) to become activated in response to diverse inflammatory stimuli was analyzed. Whereas the classical macrophage activators, IFNγ and/or LPS upregulated expression of iNOS in HSEC, the alternative macrophage activators, IL-10 or IL-4+IL-13 upregulated arginase-1 and mannose receptor. Similar upregulation of iNOS and arginase-1 was observed in classically and alternatively activated Kupffer cells, respectively. Removal of inducing stimuli from the cells had no effect on expression of these markers, demonstrating that activation is persistent. Washing and incubation of IFNγ treated cells with IL-4+IL-13 resulted in decreased iNOS and increased arginase-1 expression, while washing and incubation of IL-4+IL-13 treated cells with IFNγ resulted in decreased arginase-1 and increased iNOS, indicating that classical and alternative activation of the cells is reversible. HSEC were more sensitive to phenotypic switching than Kupffer cells, suggesting greater functional plasticity. Hepatocyte viability and expression of PCNA, β-catenin and MMP-9 increased in the presence of alternatively activated HSEC. In contrast, the viability of hepatocytes pretreated for 2 h with 5 mM acetaminophen decreased in the presence of classically activated HSEC. These data demonstrate that activated HSEC can modulate hepatocyte responses following injury. The ability of hepatocytes to activate HSEC was also investigated. Co-culture of HSEC with acetaminophen-injured hepatocytes, but not control hepatocytes, increased the sensitivity of HSEC to classical and alternative activating stimuli. The capacity of HSEC to respond to phenotypic activators may represent an important mechanism by which they participate in inflammatory responses associated with hepatotoxicity.
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Affiliation(s)
- Yinglin Liu
- Department of Pharmacology and Toxicology, Rutgers University Ernest Mario School of Pharmacy, 160 Frelinghuysen Rd., Piscataway, NJ 08854, USA
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