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We have previously reported that over-expressed c-Jun by quercetin inhibited AR transactivation,and Sp1 was involved in quercetin-mediated downregulation of AR activity.Transient transfection assays in the present work revealed that co-expression of c-Jun quenched Sp1-induced production of luciferase activity driven by AR promoter or three copies of Sp1 binding elements if the ARpromoter.