RESUMO
Objective:To observe the effect of Chaibei Zhixian decoction and peimine on Carbamazepine (CBZ) concentration, P-glycoprotein (P-gp) and multi drug resistance 1(MDR1) expression in the brain tissues of rats with refractory epilepsy, and to understand the contribution of Peimine in the compound prescription to treat the refractory epilepsy. Method:Epilepsy rat models were established by injecting kainic acid (KA) in the lateral ventricle. The successfully modeled rats were randomly divided into model group, CBZ group(0.12 g·kg-1),Chaibei Zhixian decoction+CBZ group(8.39 g·kg-1+0.12 g·kg-1), peimine+CBZ group(0.01 g·kg-1+0.12 g·kg-1) and sham operation group. After 60 days of intervention, the expression levels of P-glycoprotein (P-gp) and MDR1b mRNA in the brain cortex were detected by Western blot and quantitative real\|time fluorescence polymerase chain reaction(Real-time PCR),the contents of CBZ and 10,11-epoxidation of carbamazepine (CBZE) were measured by liquid chromatography-mass spectrometry (LC-MS). Result:Compared with sham group, the expression of P-gp/MDR1 in the cortex of model group was significantly increased (PPPPPPPConclusion:Chaibei Zhixian decoction and peimine may increase the content of CBZ and CBZE in the brain tissues in rats with intractable epilepsy by reducing the expression of MDR1/P-gp in the cortex.