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pubmed-article:11483599pubmed:abstractTextThe most frequently expressed drug resistance genes, MDR1 and MRP1, occur in human tumors with mutant p53. However, it was unknown if mutant p53 transcriptionally regulated both MDR1 and MRP1. We demonstrated that mutant p53 did not activate either the MRP1 promoter or the endogenous gene. In contrast, mutant p53 strongly up-regulated the MDR1 promoter and expression of the endogenous MDR1 gene. Notably, cells that expressed either a transcriptionally inactive mutant p53 or the empty vector showed no endogenous MDR1 up-regulation. Transcriptional activation of the MDR1 promoter by mutant p53 required an Ets binding site, and mutant p53 and Ets-1 synergistically activated MDR1 transcription. Biochemical analysis revealed that Ets-1 interacted exclusively with mutant p53s in vivo but not with wild-type p53. These findings are the first to demonstrate the induction of endogenous MDR1 by mutant p53 and provide insight into the mechanism.lld:pubmed
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pubmed-article:11483599pubmed:articleTitleMutant p53 cooperates with ETS and selectively up-regulates human MDR1 not MRP1.lld:pubmed
pubmed-article:11483599pubmed:affiliationDepartment of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.lld:pubmed
pubmed-article:11483599pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11483599pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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