Mitochondrial apoptosis induced by the HIV-1 envelope.

Abstract:

:The envelope glycoprotein complex (Env), encoded by the human immunodeficiency virus (HIV-1), kills uninfected cells expressing CD4 and/or the chemokine receptor CXCR4 or CCR5, via at least three independent mechanisms. First, the soluble Env product gp120 can induce the apoptotic cell death of lymphocytes, neurons, and myocardiocytes, via interaction with surface receptors. Second, Env present on the surface of HIV-1 infected cells can transiently interact with cells expressing CD4 and CXCR4/CCR5, thereby provoking a hemifusion event that results in the death of the uninfected cell. Third, the interaction between Env on infected cells and its receptors on uninfected cells can result in syncytium formation. Such syncytia undergo apoptosis after a phase of latency. In several models of Env-induced apoptosis, early signs of mitochondrial membrane permeabilization (MMP) become manifest. Such signs include a loss of the mitochondrial transmembrane potential and the release of cytochrome c and AIF. The mechanisms of Env-triggered apoptotic MMP may involve an elevation of cytosolic Ca(2+), reactive oxygen species and/or the transcriptional activation of p53, with the consequent expression of pro-apoptotic proteins such as Bax, which permeabilizes mitochondrial membranes. The implications of these findings for the pathophysiology of HIV-1 infection is discussed.

journal_name

Ann N Y Acad Sci

authors

Castedo M,Perfettini JL,Andreau K,Roumier T,Piacentini M,Kroemer G

doi

10.1196/annals.1299.004

subject

Has Abstract

pub_date

2003-12-01 00:00:00

pages

19-28

eissn

0077-8923

issn

1749-6632

journal_volume

1010

pub_type

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