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
Oncogenejournal_title
Oncogeneauthors
Nakamura N,Fujii M,Tsukahara T,Arai M,Ohashi T,Wakao H,Kannagi M,Yamamoto Ndoi
10.1038/sj.onc.1202608subject
Has Abstractpub_date
1999-04-29 00:00:00pages
2667-75issue
17eissn
0950-9232issn
1476-5594journal_volume
18pub_type
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