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Viral induction of Zac1b through TLR3- and IRF3-dependent pathways.

Abstract：

:Zinc finger protein regulator of apoptosis and cell cycle arrest (Zac1) is a transcription factor able to induce apoptosis or cell cycle arrest through independent pathways. In spite of the important potential functions attributed to Zac1, little is known of its physiological regulation and biological function. We discovered that variant Zac1b was expressed in murine embryonic fibroblasts (MEFs) treated with polyriboinosinic polyribocytidylic acid [poly(I:C)], a synthetic double-stranded RNA. This regulation occurred mainly through Toll-Like Receptor 3 (TLR3)- and Interferon Regulatory Factor 3 (IRF3)-dependent pathways. As TLR3 and IRF3 are central activators of antiviral immunity, we hypothesized that Zac1 may be implicated in antiviral responses. In line with this notion, we observed that Zac1b was expressed in MEFs infected with Encephalomyocarditis virus (EMCV). We also observed that Zac1-deficient MEFs were less sensitive to EMCV-induced cell death than wild-type MEFs. However, Zac1 gene inactivation had no effect on the survival of mice infected with EMCV. In conclusion, this study describes for the first time a transcriptional regulation of Zac1b, induced by synthetic dsRNA and RNA viruses, the functional significance of which remains to be further investigated.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Warzée B,Mesnil C,Hober D,Caloone D,Pirottin D,Garigliany MM,Desmecht D,Drion PV,Journot L,Lekeux P,Bureau F,Desmet CJ

doi

10.1016/j.molimm.2010.09.004

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

119-27

issue

1-3

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(10)00565-1

journal_volume

48

pub_type

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