Hepatic Macrophages Express Melanoma Differentiation-Associated Gene 5 in Nonalcoholic Steatohepatitis

The activation of innate immune system is essential for the pathogenesis of nonalcoholic steatohepatitis (NASH). Among pattern recognition receptors, it is well-characterized that toll-like receptors (TLRs) are deeply involved in the development of NASH to reflect exposure of the liver to gut-driven...

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Veröffentlicht in:Inflammation 2022-02, Vol.45 (1), p.343-355
Hauptverfasser: Kawaguchi, Shogo, Sakuraba, Hirotake, Horiuchi, Momone, Ding, Jiangli, Matsumiya, Tomoh, Seya, Kazuhiko, Iino, Chikara, Endo, Tetsu, Kikuchi, Hidezumi, Yoshida, Shukuko, Hiraga, Hiroto, Fukuda, Shinsaku, Imaizumi, Tadaatsu
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container_end_page 355
container_issue 1
container_start_page 343
container_title Inflammation
container_volume 45
creator Kawaguchi, Shogo
Sakuraba, Hirotake
Horiuchi, Momone
Ding, Jiangli
Matsumiya, Tomoh
Seya, Kazuhiko
Iino, Chikara
Endo, Tetsu
Kikuchi, Hidezumi
Yoshida, Shukuko
Hiraga, Hiroto
Fukuda, Shinsaku
Imaizumi, Tadaatsu
description The activation of innate immune system is essential for the pathogenesis of nonalcoholic steatohepatitis (NASH). Among pattern recognition receptors, it is well-characterized that toll-like receptors (TLRs) are deeply involved in the development of NASH to reflect exposure of the liver to gut-driven endotoxins. In contrast, it has not been elucidated whether retinoic acid-inducible gene-I (RIG-I)-like receptors (RLRs) are similarly implicated in the disease progression. In the present study, we examined the expression of melanoma differentiation-associated antigen 5 (MDA5), known to be a member of RLRs, in a diet-induced murine model of NASH. The liver tissues were collected from C57BL/6 J mice at 1, 3, and 6 weeks after choline-deficient l -amino acid-defined high-fat diet (CDAHFD), and the expression of MDA5 was analyzed by western blotting, immunofluorescence (IF), and real-time quantitative PCR (qPCR). The results of western blotting showed that hepatic expression of MDA5 was increased at 3 and 6 weeks. In IF, MDA5-positive cells co-expressed F4/80 and CD11b, indicating they were activated macrophages, and these cells began to appear at 1 week after CDAHFD. The mRNA expression of MDA5 was significantly upregulated at 1 week. Additionally, we performed IF using liver biopsy specimens collected from 11 patients with nonalcoholic fatty liver diseases (NAFLD), and found that MDA5-positive macrophages were detected in eight out of eleven patients. In an in vitro study, MDA5 was induced upon stimulation with lipopolysaccharide in murine bone marrow-derived macrophages and THP-1 cells. Our findings suggest that MDA5 may be involved in the inflammation of NASH.
doi_str_mv 10.1007/s10753-021-01550-8
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Among pattern recognition receptors, it is well-characterized that toll-like receptors (TLRs) are deeply involved in the development of NASH to reflect exposure of the liver to gut-driven endotoxins. In contrast, it has not been elucidated whether retinoic acid-inducible gene-I (RIG-I)-like receptors (RLRs) are similarly implicated in the disease progression. In the present study, we examined the expression of melanoma differentiation-associated antigen 5 (MDA5), known to be a member of RLRs, in a diet-induced murine model of NASH. The liver tissues were collected from C57BL/6 J mice at 1, 3, and 6 weeks after choline-deficient l -amino acid-defined high-fat diet (CDAHFD), and the expression of MDA5 was analyzed by western blotting, immunofluorescence (IF), and real-time quantitative PCR (qPCR). The results of western blotting showed that hepatic expression of MDA5 was increased at 3 and 6 weeks. In IF, MDA5-positive cells co-expressed F4/80 and CD11b, indicating they were activated macrophages, and these cells began to appear at 1 week after CDAHFD. The mRNA expression of MDA5 was significantly upregulated at 1 week. Additionally, we performed IF using liver biopsy specimens collected from 11 patients with nonalcoholic fatty liver diseases (NAFLD), and found that MDA5-positive macrophages were detected in eight out of eleven patients. In an in vitro study, MDA5 was induced upon stimulation with lipopolysaccharide in murine bone marrow-derived macrophages and THP-1 cells. 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ispartof Inflammation, 2022-02, Vol.45 (1), p.343-355
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subjects Adult
Aged
Amino acids
Animal models
Animals
Biomarkers - metabolism
Biomedical and Life Sciences
Biomedicine
Biopsy
Bone marrow
CD11b antigen
Endotoxins
Fatty liver
Female
Gene expression
High fat diet
Humans
Immune system
Immunofluorescence
Immunology
Innate immunity
Interferon-Induced Helicase, IFIH1 - metabolism
Internal Medicine
Lipopolysaccharides
Liver
Liver - immunology
Liver - metabolism
Liver diseases
Macrophages
Macrophages - metabolism
Male
Melanoma
Mice
Mice, Inbred C57BL
Middle Aged
Non-alcoholic Fatty Liver Disease - immunology
Non-alcoholic Fatty Liver Disease - metabolism
Original Article
Pathology
Pattern recognition receptors
Pharmacology/Toxicology
Retinoic acid
Rheumatology
THP-1 Cells
Toll-like receptors
Western blotting
title Hepatic Macrophages Express Melanoma Differentiation-Associated Gene 5 in Nonalcoholic Steatohepatitis
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