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  • Original Paper
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IL-2- and STAT5-regulated cytokine gene expression in cells expressing the Tax protein of HTLV-1

Abstract

Interleukin-2 (IL-2) mediates cell cycle progression and antiapoptosis in human T cells via several signal transduction pathways. The Tax protein of the human T-cell leukemia virus type I (HTLV-1) deregulates cell growth and alters the role of IL-2 in infected cells. However, Tax-immortalized cells stay dependent on IL-2, suggesting that events besides HTLV-1 gene expression are required for leukemia to develop. Here, IL-2-dependent and -independent events were analysed in a human T cell line immortalized by Tax. These studies show that, of the signaling pathways evaluated, only STAT5 remains dependent. Microarray analyses revealed several genes, including il-5, il-9 and il-13, are uniquely upregulated by IL-2 in the presence of Tax. Bioinformatics and supporting molecular biology show that some of these genes are STAT5 targets, explaining their IL-2 upregulation. These results suggest that IL-2 and viral proteins work together to induce gene expression, promoting the hypothesis that deregulation via the constitutive activation of STAT5 may lead to the IL-2-independent phenotype of HTLV-1-transformed cells.

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Acknowledgements

We thank Paul Shanahan and Lisa Becker for technical contributions and Robert Stewart and Michael David for helpful discussion. We also thank William Wachsman and staff of the UCSD Gene Chip Core Facility for the microarray analyses, the operating room at Children's Hospital of San Diego for thymus specimens, Dennis J Young at the UCSD Cancer Center for assistance with FACS analysis, Robert Kirken for phosphoserine-specific STAT5a/b antisera, and Peggy Farnham for assistance with ChIP assays. This work was supported by ACS grant #RPG-96-077-03-CNE and an SDSU Research and Creative Activity Award (to KLM). Computational facilities and support for JLF were provided by the National Biomedical Computation Resource, an NIH Research Resource (P41 RR08605-08).

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Correspondence to Kathleen L McGuire.

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Fung, M., Chu, YL., Fink, J. et al. IL-2- and STAT5-regulated cytokine gene expression in cells expressing the Tax protein of HTLV-1. Oncogene 24, 4624–4633 (2005). https://doi.org/10.1038/sj.onc.1208507

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