Binding of the hepatitis C virus envelope protein E2 to CD81 provides a co-stimulatory signal for human T cells.

Abstract:

:Chronic hepatitis C virus (HCV) infection frequently develops into liver disease and is accompanied by extra-hepatic autoimmune manifestations. The tetraspanin CD81 is a putative HCV receptor as it binds the E2 envelope glycoprotein of HCV and bona fide HCV particles. Here we show that HCV E2 binding to CD81 on human cells in vitro lowers the threshold for IL-2 receptor alpha expression and IL-2 production, resulting in strongly increased T cell proliferation. HCV E2-induced co-stimulation also enhances the production of IFN-gamma and IL-4 and causes increased TCR down-regulation. This suggests that binding of HCV particles to CD81 on T cells in vivo may lead to activation by otherwise suboptimal stimuli. Therefore, co-stimulation of autoreactive T cells by HCV may contribute to liver damage and autoimmune phenomena observed in HCV infection.

journal_name

Eur J Immunol

authors

Wack A,Soldaini E,Tseng C,Nuti S,Klimpel G,Abrignani S

doi

10.1002/1521-4141(200101)31:1<166::aid-immu166>3.0

keywords:

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

166-75

issue

1

eissn

0014-2980

issn

1521-4141

pii

10.1002/1521-4141(200101)31:1<166::AID-IMMU166>3.0

journal_volume

31

pub_type

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