Guggulsterone regulates the function and expression of P-glycoprotein in rat brain microvessel endothelial cells

Our previous studies found that guggulsterone could inhibit P-glycoprotein-mediated multidrug resistance in P-glycoprotein over-expressed human cancer cell lines. However, the effects of guggulsterone on the;P-glycoprotein function and expression in rat brain microvessel endothelial cells (rBMECs) are poorly understood. In the present study, we investigated whether guggulsterone has a modulative effect on the function and expression of P-glycoprotein in rBIVIECs. rhodamine 123 acts as a good substrate for P-glycoprotein, and agents that block P-glycoprotein have been found to increase the retention of rhodamine in cells. The results showed that the accumulation of rhodamine 123 in rBMECs was potentiated in a time-dependent manner after incubation with 30, 100 pM guggulsterone (P< 0.05). Efflux of intracellular rhodamine 123 was decreased in a time-dependent manner from after 30, 100 mu M guggulsterone treatment. The inhibitory effect of guggulsterone on P-glycoprotein function was reversible and remained at 120 min after removal of 30, 100 mu M guggulsterone from the medium. Further results showed that guggulsterone (30, 100 OA) down-regulated the expression of P-glycoproLein, and had no influence on the expression of breast cancer resistance protein in rBMECs. In addition, the present study revealed that guggulsterone promoted the activity of P-glycoprotein ATPase in a closedependent manner. These results indicated that guggulsterone suppressed the function and expression of P-glycoprotein in rBMECs primary cultures. (C) 2013 Elsevier B.V. All rights reserved.