Inhibition of Bim Enhances Replication of Varicella-zoster Virus and Delays Plaque Formation in Virus-infected Cells

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 2013 Nov 15

PMID 24227856

Citations 7

Authors

Xueqiao Liu

Jeffrey I Cohen

Affiliations

Soon will be listed here.

Abstract

Programmed cell death (apoptosis) is an important host defense mechanism against intracellular pathogens, such as viruses. Accordingly, viruses have evolved multiple mechanisms to modulate apoptosis to enhance replication. Varicella-zoster virus (VZV) induces apoptosis in human fibroblasts and melanoma cells. We found that VZV triggered the phosphorylation of the proapoptotic proteins Bim and BAD but had little or no effect on other Bcl-2 family members. Since phosphorylation of Bim and BAD reduces their proapoptotic activity, this may prevent or delay apoptosis in VZV-infected cells. Phosphorylation of Bim but not BAD in VZV-infected cells was dependent on activation of the MEK/extracellular signal-regulated kinase (ERK) pathway. Cells knocked down for Bim showed delayed VZV plaque formation, resulting in longer survival of VZV-infected cells and increased replication of virus, compared with wild-type cells infected with virus. Conversely, overexpression of Bim resulted in earlier plaque formation, smaller plaques, reduced virus replication, and increased caspase 3 activity. Inhibition of caspase activity in VZV-infected cells overexpressing Bim restored levels of virus production similar to those seen with virus-infected wild-type cells. Previously we showed that VZV ORF12 activates ERK and inhibits apoptosis in virus-infected cells. Here we found that VZV ORF12 contributes to Bim and BAD phosphorylation. In summary, VZV triggers Bim phosphorylation; reduction of Bim levels results in longer survival of VZV-infected cells and increased VZV replication.

Citing Articles

Modulation of Apoptosis and Cell Death Pathways by Varicella-Zoster Virus.

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Manipulation of the Innate Immune Response by Varicella Zoster Virus.

Gerada C, Campbell T, Kennedy J, McSharry B, Steain M, Slobedman B Front Immunol. 2020; 11:1.

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Varicella-Zoster Virus ORF63 Protects Human Neuronal and Keratinocyte Cell Lines from Apoptosis and Changes Its Localization upon Apoptosis Induction.

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