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Luci C, Vieira E, Bourinet M, Rousseau D, Bonnafous S, Patouraux S, Lefevre L, Larbret F, Prod’homme V, Iannelli A, Tran A, Anty R, Bailly-Maitre B, Deckert M, Gual P. SYK-3BP2 Pathway Activity in Parenchymal and Myeloid Cells Is a Key Pathogenic Factor in Metabolic Steatohepatitis. Cell Mol Gastroenterol Hepatol 2021; 13:173-191. [PMID: 34411785 PMCID: PMC8593618 DOI: 10.1016/j.jcmgh.2021.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 08/09/2021] [Accepted: 08/10/2021] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS Spleen tyrosine kinase (SYK) signaling pathway regulates critical processes in innate immunity, but its role in parenchymal cells remains elusive in chronic liver diseases. We investigate the relative contribution of SYK and its substrate c-Abl Src homology 3 domain-binding protein-2 (3BP2) in both myeloid cells and hepatocytes in the onset of metabolic steatohepatitis. METHODS Hepatic SYK-3BP2 pathway was evaluated in mouse models of metabolic-associated fatty liver diseases (MAFLD) and in obese patients with biopsy-proven MAFLD (n = 33). Its role in liver complications was evaluated in Sh3bp2 KO and myeloid-specific Syk KO mice challenged with methionine and choline deficient diet and in homozygous Sh3bp2KI/KI mice with and without SYK expression in myeloid cells. RESULTS Here we report that hepatic expression of 3BP2 and SYK correlated with metabolic steatohepatitis severity in mice. 3BP2 deficiency and SYK deletion in myeloid cells mediated the same protective effects on liver inflammation, injury, and fibrosis priming upon diet-induced steatohepatitis. In primary hepatocytes, the targeting of 3BP2 or SYK strongly decreased the lipopolysaccharide-mediated inflammatory mediator expression and 3BP2-regulated SYK expression. In homozygous Sh3bp2KI/KI mice, the chronic inflammation mediated by the proteasome-resistant 3BP2 mutant promoted severe hepatitis and liver fibrosis with augmented liver SYK expression. In these mice, the deletion of SYK in myeloid cells was sufficient to prevent these liver lesions. The hepatic expression of SYK is also up-regulated with metabolic steatohepatitis and correlates with liver macrophages in biopsy-proven MAFLD patients. CONCLUSIONS Collectively, these data suggest an important role for the SYK-3BP2 pathway in the pathogenesis of chronic liver inflammatory diseases and highlight its targeting in hepatocytes and myeloid cells as a potential strategy to treat metabolic steatohepatitis.
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Affiliation(s)
- Carmelo Luci
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France
| | - Elodie Vieira
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France
| | - Manon Bourinet
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France
| | | | | | | | - Lauren Lefevre
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France
| | | | | | | | - Albert Tran
- Université Côte d’Azur, CHU, INSERM, U1065, C3M, Nice, France
| | - Rodolphe Anty
- Université Côte d’Azur, CHU, INSERM, U1065, C3M, Nice, France
| | | | - Marcel Deckert
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France,Marcel Deckert, PhD, Inserm UMR1065/C3M, Bâtiment Universitaire ARCHIMED, Team "Microenvironment, signaling and cancer", 151 route Saint Antoine de Ginestière, BP 2 3194, 06204 Nice, France.
| | - Philippe Gual
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France,Correspondence Address correspondence to: Philippe Gual, PhD, Inserm UMR1065/C3M, Bâtiment Universitaire ARCHIMED, Team "Chronic liver diseases associated with obesity and alcohol", 151 route Saint Antoine de Ginestière, BP 2 3194, 06204 Nice, France. fax: +33 4 89 06 42 60.
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Elasifer H, Wang EC, Prod’homme V, Davies J, Forbes S, Stanton RJ, Patel M, Fielding CA, Roberts D, Traherne JA, Gruber N, Bugert JJ, Aicheler RJ, Wilkinson GWG. Downregulation of HLA-I by the molluscum contagiosum virus mc080 impacts NK-cell recognition and promotes CD8 + T-cell evasion. J Gen Virol 2020; 101:863-872. [PMID: 32510303 PMCID: PMC7641395 DOI: 10.1099/jgv.0.001417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 03/26/2020] [Indexed: 11/18/2022] Open
Abstract
Molluscum contagiosum virus (MCV) is a common cause of benign skin lesions in young children and currently the only endemic human poxvirus. Following the infection of primary keratinocytes in the epidermis, MCV induces the proliferation of infected cells and this results in the production of wart-like growths. Full productive infection is observed only after the infected cells differentiate. During this prolonged replication cycle the virus must avoid elimination by the host immune system. We therefore sought to investigate the function of the two major histocompatibility complex class-I-related genes encoded by the MCV genes mc033 and mc080. Following insertion into a replication-deficient adenovirus vector, codon-optimized versions of mc033 and mc080 were expressed as endoglycosidase-sensitive glycoproteins that localized primarily in the endoplasmic reticulum. MC080, but not MC033, downregulated cell-surface expression of endogenous classical human leucocyte antigen (HLA) class I and non-classical HLA-E by a transporter associated with antigen processing (TAP)-independent mechanism. MC080 exhibited a capacity to inhibit or activate NK cells in autologous assays in a donor-specific manner. MC080 consistently inhibited antigen-specific T cells being activated by peptide-pulsed targets. We therefore propose that MC080 acts to promote evasion of HLA-I-restricted cytotoxic T cells.
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Affiliation(s)
- Hana Elasifer
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
| | - Eddie C.Y. Wang
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
| | - Virginie Prod’homme
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
- Present address: Centre Méditerranéen de Médecine Moléculaire, University of Nice Sophia, Antipolis, France
| | - James Davies
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
| | - Simone Forbes
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
| | - Richard J. Stanton
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
| | - Mihil Patel
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
| | - Ceri A. Fielding
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
| | - Dawn Roberts
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
| | - James A. Traherne
- Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK
| | - Nicole Gruber
- DKMS Life Science Lab, St. Petersburger Str. 2, 01069 Dresden, Germany
| | - Joachim J. Bugert
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
- Present address: Institut für Mikrobiologie der Bundeswehr, München, Germany
| | - Rebecca J. Aicheler
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
- School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff CF5 2YB, UK
| | - Gavin W. G. Wilkinson
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff CF14 4XW, UK
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Prod’homme V, Griffin C, Aicheler RJ, Wang ECY, McSharry BP, Rickards CR, Stanton RJ, Borysiewicz LK, López-Botet M, Wilkinson GWG, Tomasec P. The human cytomegalovirus MHC class I homolog UL18 inhibits LIR-1+ but activates LIR-1- NK cells. J Immunol 2007; 178:4473-81. [PMID: 17372005 PMCID: PMC2843079 DOI: 10.4049/jimmunol.178.7.4473] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The inhibitory leukocyte Ig-like receptor 1 (LIR-1, also known as ILT2, CD85j, or LILRB1) was identified by its high affinity for the human CMV (HCMV) MHC class I homolog gpUL18. The role of this LIR-1-gpUL18 interaction in modulating NK recognition during HCMV infection has previously not been clearly defined. In this study, LIR-1(+) NKL cell-mediated cytotoxicity was shown to be inhibited by transduction of targets with a replication-deficient adenovirus vector encoding UL18 (RAd-UL18). Fibroblasts infected with an HCMV UL18 mutant (DeltaUL18) also exhibited enhanced susceptibility to NKL killing relative to cells infected with the parental virus. In additional cytolysis assays, UL18-mediated protection was also evident in the context of adenovirus vector transduction and HCMV infection of autologous fibroblast targets using IFN-alpha-activated NK bulk cultures derived from a donor with a high frequency of LIR-1(+) NK cells. A single LIR-1(high) NK clone derived from this donor was inhibited by UL18, while 3 of 24 clones were activated. CD107 mobilization assays revealed that LIR-1(+) NK cells were consistently inhibited by UL18 in all tested donors, but this effect was often masked in the global response by UL18-mediated activation of a subset of LIR-1(-) NK cells. Although Ab-blocking experiments support UL18 inhibition being induced by a direct interaction with LIR-1, the UL18-mediated activation is LIR-1 independent.
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Affiliation(s)
- Virginie Prod’homme
- Department of Medical Microbiology, Cardiff University, Cardiff, United Kingdom
| | - Cora Griffin
- Department of Medical Microbiology, Cardiff University, Cardiff, United Kingdom
| | - Rebecca J. Aicheler
- Department of Medical Microbiology, Cardiff University, Cardiff, United Kingdom
| | - Eddie C. Y. Wang
- Department of Medical Biochemistry and Immunology, Cardiff University, Cardiff, United Kingdom
| | - Brian P. McSharry
- Department of Medical Microbiology, Cardiff University, Cardiff, United Kingdom
| | - Carole R. Rickards
- Department of Medical Microbiology, Cardiff University, Cardiff, United Kingdom
| | - Richard J. Stanton
- Department of Medical Microbiology, Cardiff University, Cardiff, United Kingdom
| | | | - Miguel López-Botet
- Department of Experimental and Health Sciences, Molecular Immunopathology Unit, Universitat Pompeu Fabra, Barcelona, Spain
| | - Gavin W. G. Wilkinson
- Department of Medical Microbiology, Cardiff University, Cardiff, United Kingdom
- Address correspondence and reprint requests to Prof. Gavin G. W. Wilkinson, Department of Medical Microbiology, Cardiff University, Tenovus Building, Heath Park, Cardiff, U.K.
| | - Peter Tomasec
- Department of Medical Microbiology, Cardiff University, Cardiff, United Kingdom
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