Abstract
Previous reports have shown that, in certain cell types, p21WAF-1, which plays a central role in cell proliferation, can be activated by HTLV-I Tax protein and by TPA. Tax and TPA are also known to stimulate HTLV-I gene expression. Since cell proliferation has a major impact on HTLV-I replication, it was of interest to investigate their effect on p21WAF-1 in human T cells, which are the main target of HTLV-I in human infection. This study demonstrates that p21WAF-1 is activated in such cells by both factors, each acting through a different mechanism that does not influence the other. The effect of TPA is shown to require PKC activity. Notably, however, examination of different PKC isoforms revealed that PKC-α and PKC-ɛ stimulated p21WAF-1 expression, whereas PKC-η was rather inhibitory and PKC-β1 and β2 were ineffective. All these isoforms were found to be activated by TPA in the employed T cells, but this apparent paradox was resolved by the observation that when coexpressed together in these cells, the stimulatory PKCs override the inhibitory isoform. Further experiments demonstrated that the PKC-induced p21WAF-1 activation was mediated by binding of Sp1-p53 complex to the second most upstream of the six Sp1 recognition sites present in its promoter and that this effect did not require the cooperation of an p53-binding site.
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Acknowledgements
This study was supported by grants from the Association of International Cancer Research, (AICR), the Israeli Ministry of Science, Culture and Sports (MOS)-German Cancer Research Center (DKFZ), German–Israeli Cooperation in Cancer Research Program, the Israel Science Foundation of The Israeli National Academy of Sciences and Humanities, the Israeli Cancer Association, the Israel Cancer Research Fund (ICRF) and the Chief Scientist Office of the Israeli Health Ministry.
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Schavinsky-Khrapunsky, Y., Huleihel, M., Aboud, M. et al. Role of protein kinase C and the Sp1-p53 complex in activation of p21WAF-1 expression by 12-O-tetradecanoylphorbol-13-acetate in human T cells. Oncogene 22, 5315–5324 (2003). https://doi.org/10.1038/sj.onc.1206782
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DOI: https://doi.org/10.1038/sj.onc.1206782
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