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• W2171342617 abstract "We have previously demonstrated that 12-O-tetradecanoylphorbol-13-acetate (TPA) activates human T-cell leukemia virus type-I long terminal repeat (LTR) in Jurkat cells by a protein kinase C (PKC)-independent mechanism involving a posttranslational activation of Sp1 binding to an Sp1 site located within the Ets responsive region-1 (ERR-1). By employing the PKC inhibitor, bisindolylmaleimide I and cotransfecting the reporter LTR construct with a vector expressing PKC-alpha, we demonstrated, in the present study, that this effect of TPA was not only independent of, but actually antagonized by, PKC. Electrophoretic mobility shift assays together with antibody-mediated supershift and immuno-coprecipitation analyses, revealed that the posttranslational activation of Sp1 was exerted by inducing the formation of Sp1-p53 heterocomplex capable of binding to the Sp1 site in ERR-1. Furthermore, we demonstrated that Jurkat cells contain both wild-type (w.t.) and mutant forms of p53 and we detected both of them in this complex at variable combinations; some molecules of the complex contained either the w.t. or the mutant p53 separately, whereas others contained the two of them together. Finally, we showed that the Sp1-p53 complexes could bind also to an Sp1 site present in the promoter of another gene such as the cyclin-dependent kinase inhibitor p21(WAF-1), but not to consensus recognition sequences of the w.t. p53. Therefore, we speculate that there might be several other PKC-independent biological effects of TPA which result from interaction of such Sp1-p53 complexes with Sp1 recognition sites residing in the promoters of a wide variety of cellular and viral genes." @default.
• W2171342617 created "2016-06-24" @default.
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• W2171342617 date "2001-03-01" @default.
• W2171342617 modified "2023-10-09" @default.
• W2171342617 title "Sp1-p53 Heterocomplex Mediates Activation of HTLV-I Long Terminal Repeat by 12-O-Tetradecanoylphorbol-13-acetate That Is Antagonized by Protein Kinase C" @default.
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• W2171342617 doi "https://doi.org/10.1006/viro.2000.0779" @default.
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