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2015 ; 62
(5
): 1536-50
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A novel "humanized mouse" model for autoimmune hepatitis and the association of
gut microbiota with liver inflammation
#MMPMID26185095
Yuksel M
; Wang Y
; Tai N
; Peng J
; Guo J
; Beland K
; Lapierre P
; David C
; Alvarez F
; Colle I
; Yan H
; Mieli-Vergani G
; Vergani D
; Ma Y
; Wen L
Hepatology
2015[Nov]; 62
(5
): 1536-50
PMID26185095
show ga
Autoimmune hepatitis (AIH) in humans is a severe inflammatory liver disease
characterized by interface hepatitis, the presence of circulating autoantibodies,
and hyper-gammaglobulinemia. There are two types of AIH, type 1 (AIH-1) and type
2 (AIH-2), characterized by distinct autoimmune serology. Patients with AIH-1 are
positive for anti-smooth muscle and/or antinuclear autoantibodies, whereas
patients with AIH-2 have anti-liver kidney microsomal type 1 and/or anti-liver
cytosol type 1 autoantibodies. Cytochrome P4502D6 is the antigenic target of
anti-liver kidney microsomal type 1, and formiminotransferase cyclodeaminase is
the antigenic target of anti-liver cytosol type 1. It is known that AIH, both
types 1 and 2, is strongly linked to the human leukocyte antigen (HLA) alleles
-DR3, -DR4, and -DR7. However, direct evidence of the association of HLA with AIH
is lacking. We developed a novel mouse model of AIH using the HLA-DR3 transgenic
mouse on the nonobese-diabetic background by immunization of HLA-DR3- and
HLA-DR3+ nonobese-diabetic mice with a DNA plasmid, coding for human cytochrome
P4502D6/formiminotransferase cyclodeaminase fusion protein. Immunization with
cytochrome P4502D6/formiminotransferase cyclodeaminase leads to a sustained
elevation of alanine aminotransferase, development of antinuclear autoantibodies
and anti-liver kidney microsomal type 1/anti-liver cytosol type 1 autoantibodies,
chronic immune cell infiltration, and parenchymal fibrosis on liver histology in
HLA-DR3+ mice. Immunized mice also showed an enhanced T helper 1 immune response
and paucity of the frequency of regulatory T cells in the liver. Moreover,
HLA-DR3+ mice with exacerbated AIH showed reduced diversity and total load of gut
bacteria. CONCLUSION: Our humanized animal model has provided a novel
experimental tool to further elucidate the pathogenesis of AIH and to evaluate
the efficacy and safety of immunoregulatory therapeutic interventions in vivo.