Human T-cell leukemia virus type 1 Tax protein induces the expression of STAT1 and STAT5 genes in T-cells.

Abstract:

:Human T-cell leukemia virus type 1 (HTLV-1) Tax transforms normal T-cells in the presence of interleukin (IL)-2 in vitro. STAT is a family of transcription factors that play a pivotal role in cytokine-induced functions of a various type of cells. We investigated the involvement of STATs in the transformation of T-cells by HTLV-1. HTLV-1-transformed T-cell lines expressed higher amounts of STAT1, STAT3 and STAT5 RNA and proteins than virus-negative T cells. The expression of STAT1 and STAT5 in a human T-cell line was induced by Tax. IL-2 induced the DNA binding activity of STAT3 and STAT5 of a HTLV-1-transformed cell line and then stimulated its proliferation. In contrast, IL-2 did neither in a cell line lacking STAT3 and STAT5. The expression of STAT1, STAT3 and STAT5 mRNAs were also induced by a T-cell mitogen in normal human peripheral blood mononuclear cells. Our results suggest that the induction of STAT1 and STAT5 by Tax enhances cytokine-induced functions of virus-infected T-cells, hence the induction may play a role in IL-2-dependent transformation steps of T-cells by HTLV-1.

journal_name

Oncogene

journal_title

Oncogene

authors

Nakamura N,Fujii M,Tsukahara T,Arai M,Ohashi T,Wakao H,Kannagi M,Yamamoto N

doi

10.1038/sj.onc.1202608

subject

Has Abstract

pub_date

1999-04-29 00:00:00

pages

2667-75

issue

17

eissn

0950-9232

issn

1476-5594

journal_volume

18

pub_type

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