Carbamazepine regulates intestinal P-glycoprotein and multidrug resistance protein MRP2 and influences disposition of talinolol in humans

Clinical Pharmacology and Therapeutics
Thomas GiessmannW Siegmund

Abstract

The antiepileptic drug carbamazepine is known to be an inducer of cytochrome P450 (CYP) 3A4 after binding to the nuclear pregnane X receptor. To evaluate whether it also regulates the multidrug transporter proteins P-glycoprotein (P-gp) and multidrug resistance protein MRP2 in humans, duodenal expression of multidrug resistance gene MDR1 messenger ribonucleic acid (mRNA) and MRP2 mRNA, content of P-gp and MRP2, and disposition of the nonmetabolized P-gp substrate talinolol after intravenous (30 mg) and long-term oral administration (100 mg for 19 days) were assessed in 7 healthy subjects (age, 23-35 years; body weight, 64-93 kg) before and after comedication of carbamazepine (600 mg for 14-18 days). Carbamazepine medication was associated with increased urinary excretion of D-glucaric acid and induction of carbamazepine elimination. Creatinine clearance was not affected. Duodenal expression of both MDR1 mRNA and MRP2 mRNA and the MPR2 protein was significantly induced, whereas the P-gp content was not affected. MDR1 mRNA expression and MPR2 mRNA expression were correlated ( r = 0.873, P <.001). After carbamazepine, metabolic clearance of intravenous talinolol was significantly increased. Residual clearance was significantly dec...Continue Reading

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