The ability of BHRF1 to inhibit apoptosis is dependent on stimulus and cell type.

Abstract:

:The development of resistance to host defense mechanisms such as tumor necrosis factor (TNF)- and Fas-mediated apoptosis of transformed or virus-infected cells may be a critical component in the development of disease. To find genes that protect cells from apoptosis, we used an expression cloning strategy and identified BHRF1, an Epstein-Barr virus (EBV) early-lytic-cycle protein with distant homology to Bcl-2, as an anti-apoptosis protein. Expression of BHRF1 in MCF-Fas cells conferred nearly complete resistance against both anti-Fas antibody and TNF-mediated apoptosis. In addition, BHRF1 protected these cells from monocyte-mediated killing but failed to protect them from killing mediated by lymphokine-activated killer cells. The ability of BHRF1 to protect MCF-Fas cells from apoptosis induced by various stimuli was identical to that of Bcl-2 and Bcl-xL. Moreover, the mechanism of action of BHRF1 resembled that of Bcl-2 and Bcl-xL as it inhibited TNF- and anti-Fas-induced activation of two enzymes participating in the apoptosis pathway, cytosolic phospholipase A2 and caspase-3/CPP32, but did not interfere with the activation of NF-kappaB-like transcription factors. A putative function of BHRF1 in EBV-infected epithelial cells may be to protect virus-infected cells from TNF- and/or anti-Fas-induced cell death in order to maximize virus production. Surprisingly, expression of neither BHRF1 nor Bcl-2 in a B-cell line, BJAB, protected the cells from anti-Fas-mediated apoptosis even though they increased the survival of serum-starved cells. Thus, the protective role of BHRF1 against apoptosis resembles that of Bcl-2 in being cell type specific and dependent on the apoptotic stimulus.

journal_name

J Virol

journal_title

Journal of virology

authors

Foghsgaard L,Jäättelä M

doi

10.1128/JVI.71.10.7509-7517.1997

subject

Has Abstract

pub_date

1997-10-01 00:00:00

pages

7509-17

issue

10

eissn

0022-538X

issn

1098-5514

journal_volume

71

pub_type

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