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In contrast, Mdr1a induction was suppressed after pregnane X receptor (PXR) inhibition by sulforaphane and knockdown of this nuclear receptor. These findings were confirmed in vivo by using the PXR antagonist ketoconazole. In conclusion, we demonstrated the induction of hepatic P-gp expression and activity by GNT in vivo, with PXR being a likely mediator. This suggests that GNT, at concentrations observed in plasma of individuals consuming the phytoestrogen in the diet or through supplements, could affect the clearance of relevant P-gp s