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However, after treatment with Z-guggulsterone (≤30 μM), the level of MDR1 reporter gene activity was lower in human PXR-transfected cells than that in human CAR-transfected cells. The inhibition effect of Z-guggulsterones on MDR1 reporter gene activation was gradually enhanced with the increase of human PXR to CAR ratio, which was greater extent than that with the increase of human CAR to hPXR ratio. The present study suggested that Z-guggulsterone down-regulating the efflux function and expression of MDR1 in hBDMECs might be mainly thr