Human T-cell leukemia virus type 1 Tax attenuates gamma-irradiation-induced apoptosis through physical interaction with Chk2.

Abstract:

:Checkpoint kinase 2 (Chk2) is known to mediate diverse cellular responses to genotoxic stress. The fundamental role of Chk2 is to regulate the network of genome-surveillance pathways that coordinate cell-cycle progression with DNA repair and cell survival or death. Defects in Chk2 contribute to the development of both hereditary and sporadic human cancers. We now present evidence that the human T-cell leukemia virus type-1 (HTLV-1) Tax protein directly interacts with Chk2 and the kinase activity of Chk2 is inhibited by Tax. The physical interaction of Chk2 and Tax was observed by co-immunoprecipitation assays in HTLV-1-infected T cells (C81) as well as GST pull-down assays using purified proteins. Binding and kinase activity inhibition studies with Tax deletion mutants indicated that at least two domains of Tax mediate the interaction with Chk2. We have analysed the functional consequence of de novo expression of Tax upon the cellular DNA-damage-induced apoptosis, which is mediated by Chk2. Using transient transfection and TUNEL assay, we found that gamma-irradiation-induced apoptosis was decreased in 293T and HCT-116 (p53(-/-)) cells expressing HTLV-1 Tax. Our studies demonstrate an important potential target of Tax in cellular transformation.

journal_name

Oncogene

journal_title

Oncogene

authors

Park HU,Jeong SJ,Jeong JH,Chung JH,Brady JN

doi

10.1038/sj.onc.1209059

subject

Has Abstract

pub_date

2006-01-19 00:00:00

pages

438-47

issue

3

eissn

0950-9232

issn

1476-5594

pii

1209059

journal_volume

25

pub_type

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