Suppression of hepatitis C virus replication by cyclosporin a is mediated by blockade of cyclophilins.

Abstract:

BACKGROUND & AIMS:Cyclosporin A specifically suppresses hepatitis C virus (HCV) replication in vitro at clinically achievable concentrations. In this study, we investigated the mechanisms of action of cyclosporin A against HCV replication. METHODS:The in vitro effects of cyclosporin A on HCV replication were analyzed using an HCV replicon system that expresses chimeric luciferase reporter protein. RESULTS:The significant effects of cyclosporin A on expression of an HCV replicon and the absence of such effects of FK506, which shares mechanisms of action with cyclosporin A, suggested the involvement of intracellular ligands of cyclosporin A, the cyclophilins. Transient and stable knockdown of the expression of cytoplasmic cyclophilins A, B, and C by short hairpin RNA-expressing vectors suppressed HCV replication significantly. A cyclosporin analogue, cyclosporin D, which lacks immunosuppressive activity but exhibits cyclophilin binding, induced a similar suppression of HCV replication. Furthermore, cyclosporin A treatment of Huh7 cells induced an unfolded protein response exemplified by expression of cellular BiP/GRP78. Treatment of cells with thapsigargin and mercaptoethanol, which induce the unfolded protein responses, suppressed HCV replication, suggesting that the cyclosporin-induced unfolded protein responses might contribute to the suppression of HCV protein processing and replication. CONCLUSIONS:The anti-HCV activity of cyclosporin A is mediated through a specific blockade of cyclophilins, and these molecules may constitute novel targets for anti-HCV therapeutics.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Nakagawa M,Sakamoto N,Tanabe Y,Koyama T,Itsui Y,Takeda Y,Chen CH,Kakinuma S,Oooka S,Maekawa S,Enomoto N,Watanabe M

doi

10.1053/j.gastro.2005.06.031

keywords:

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

1031-41

issue

3

eissn

0016-5085

issn

1528-0012

pii

S0016-5085(05)01192-3

journal_volume

129

pub_type

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