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Different aspects of CD4 T cells that lead to viral clearance or persistence of HCV infection.

Abstract：

:More than 170 million people worldwide are infected with hepatitis C virus (HCV). A characteristic of this virus is a high tendency toward chronic infection. Several factors affect the viral outcome after infection. Among them, HCV-specific CD4 T cells are thought to play a crucial role in controlling viremia. Cumulative data showed that spontaneously resolved individuals have vigorous CD4 T-cell responses to a broad spectrum of HCV antigens and maintain these responses over a long period of time, whereas chronically infected patients lose their CD4 T-cell responses in the acute phase of infection. Although several possibilities of why CD4 T cells lose their function have been proposed, the mechanisms are not completely understood. Moreover, there is another subset of CD4 T cells called regulatory T cells (Tregs). These cells suppress immune reaction of T cells, B cells, and antigen-presenting cells, and are thought to protect organs from immune overreaction and autoimmunity. An increasing amount of data supports the possibility that Tregs participate in the mechanism of HCV persistence. It is obvious that CD4 T cells are the main effectors controlling HCV outcome. To achieve a better prognosis, we need to understand the mechanism of how HCV earns its chronicity by escaping from host cellular immune attacks. In this review, we will focus on the role of HCV-specific T cells in controlling viremia, particularly the aspects of these cells being either inhibitors or propellers of chronic infection.

journal_name

Hepatol Int

journal_title

Hepatology international

authors

Sugimoto K,Shiraki K

doi

10.1007/s12072-011-9321-8

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

350-5

issue

1

eissn

1936-0533

issn

1936-0541

pii

10.1007/s12072-011-9321-8

journal_volume

6

pub_type

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