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Antiapoptotic effect of human T-cell leukemia virus type 1 tax protein correlates with its creb transcriptional activity.

Abstract：

:Defects in the regulation of programmed cell death play a fundamental role in the development of neoplasia and neurological disorders, both of which are linked to the human T-cell leukemia/lymphoma virus type 1 (HTLV-1) infection. We previously showed that the HTLV-1 Tax protein protects from apoptosis induced by serum starvation by preventing cytochrome c release and Bax relocation to mitochondria, two early events in the mitochondrial apoptotic pathway. As a natural extension of these findings, and to better define the action of Tax, in the present study, we investigated the outcome of Tax and two mutants which are inactive in CREB/ATF (M47) or NF-kappaB (M22) pathways, in the control of apoptosis induced by the proapoptotic Bax protein. We found that activation of CREB, rather than NF-kappaB, is a key phenomenon in preventing apoptosis. Furthermore, the importance of CREB activation is strengthened by experiments with CREB mutants, treatment with forskolin, and in situ analysis of P-CREB status in cells transfected with Tax or its nonprotecting M47 mutant. Considered together, these results underscore a primary role of CREB in preventing apoptosis triggered by Bax, and suggest that Tax might act by affecting the phosphorylation state of CREB.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Trevisan R,Daprai L,Paloschi L,Vajente N,Chieco-Bianchi L,Saggioro D

doi

10.1016/j.yexcr.2006.01.009

keywords:

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

1390-400

issue

8

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(06)00005-X

journal_volume

312

pub_type

杂志文章

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