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FOXP3+ regulatory T cells in autoimmune hepatitis are fully functional and not reduced in frequency.

Abstract：

BACKGROUND & AIMS:The pathogenesis of autoimmune hepatitis (AIH) is not understood, but it was suggested that AIH may be related to a numerical or functional impairment of CD4+CD25+FOXP3+ regulatory T cells (Treg), which are important mediators of immune tolerance to self-antigens. However, the role of Treg in AIH is not clear, since earlier studies reporting Treg impairment had used only CD25 as marker that cannot unambiguously distinguish Treg from activated effector T cells. METHODS:We assessed the frequency and suppressor function of Treg using current staining protocols that can distinguish Treg from activated effector T cells. RESULTS:The frequency of CD4+CD25(high)CD127(low)FOXP3+ Treg cells in blood of AIH patients was not reduced compared to healthy subjects, as shown by flow cytometry and confirmed by quantifying Treg-specific demethylation of the FOXP3 gene. Moreover, the suppressor function of Treg isolated from AIH patients was similar to that of Treg isolated from healthy subjects, indicating that Treg function was not impaired in AIH patients. However, we observed that the Treg frequency was significantly higher in those AIH patients with active disease than in those who were in a state of remission, suggesting that the Treg frequency may increase with the degree of inflammation. Indeed, analysis of FOXP3+ Treg in liver histology revealed that the intrahepatic Treg frequency was higher in AIH patients than in NASH patients and correlated with the inflammatory activity of the liver. CONCLUSIONS:The frequency and function of circulating Treg cells is not impaired in AIH.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Peiseler M,Sebode M,Franke B,Wortmann F,Schwinge D,Quaas A,Baron U,Olek S,Wiegard C,Lohse AW,Weiler-Normann C,Schramm C,Herkel J

doi

10.1016/j.jhep.2012.02.029

subject

Has Abstract

pub_date

2012-07-01 00:00:00

pages

125-32

issue

1

eissn

0168-8278

issn

1600-0641

pii

S0168-8278(12)00217-6

journal_volume

57

pub_type

杂志文章

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