Elevated expression of CCL5/RANTES in adult T-cell leukemia cells: possible transactivation of the CCL5 gene by human T-cell leukemia virus type I tax

International Journal of Cancer. Journal International Du Cancer
Naoki MoriNaoki Yamamoto

Abstract

HTLV-I is the etiologic agent of ATL and of tropical spastic paraparesis/HTLV-I-associated myelopathy. Infiltration of various tissues by circulating leukemic cells and HTLV-I-infected T cells is a characteristic of ATL and HTLV-I-associated inflammatory diseases. Chemokines play important roles in migration and tissue localization of various lymphocyte subsets. Here, we report the highly frequent expression of CCL5 (RANTES) in ATL and HTLV-I-infected T-cell lines. Among various human T-cell lines, those infected with HTLV-I selectively expressed the CCL5 gene and secreted CCL5. Furthermore, CCL5 was expressed by leukemic cells in peripheral blood and lymph nodes from patients with ATL. Inducible expression of HTLV-I transcriptional activator Tax in a human T-cell line Jurkat, up-regulated CCL5 mRNA and induced CCL5 secretion. Analysis of the CCL5 promoter revealed that this gene is activated by Tax, via the activation of NF-kappaB, whose responsive element, R(A/B), is located at positions -71 to -43 relative to the putative transcription start site. Aberrant expression of CCL5 by HTLV-I-infected T cells may impact on the pathophysiology of HTLV-I-associated diseases.

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Mar 28, 2008·Journal of Human Genetics·Shailendra Kapoor
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