title: Beneficial effect of tetrandrine on refractory epilepsy via suppressing P-glycoprotein.
abstract: Patients with refractory epilepsy are resistance to antiepileptic drugs (AEDs). The mechanisms of drug resistance are varied, but one of them is the overexpression of multidrug transporters, such as P-glycoprotein (P-gp), in the brain. Tetrandrine (TTD) is a bis-benzylisoquinoline alkaloid isolated from the root of Stephania tetrandra (S, Moore) and is found to have a favorable effect against multidrug resistance (MDR) in chemotherapy. However, whether TTD affects AEDs in refractory epilepsy is unknown. In this study, we investigated the change in AED treatment efficacy in doxorubicin-induced drug resistant cells after TTD administration. We also examined the effect of TTD on seizure behaviors in the refractory epileptic rats, specifically the expression of MDR1 mRNA and P-gp protein in the cortex and hippocampus of the refractory epileptic rats. Our results demonstrated that TTD decreased cell resistance to phenytoin and valproate. TTD decreased seizure rate and increased the treatment efficacy of AEDs by reducing the expression of P-gp at mRNA and protein levels in vivo. These data support the use of TTD as an adjuvant drug for treating refractory epilepsy.
authors.affiliation: 1Department of Neurology, Jinshan Hospital, Fudan University , Shanghai , China.
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Chen
authors.forename: Xia
authors.initials: X
authors.lastname: Xiao
authors.forename: Cuicui
authors.initials: C
authors.lastname: Wang
authors.forename: Huiyuan
authors.initials: H
authors.lastname: Jiang
authors.forename: Zhen
authors.initials: Z
authors.lastname: Hong
authors.forename: Guoxiong
authors.initials: G
authors.lastname: Xu
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B / Q000037:antagonists & inhibitors*; D000818:Animals; D000927:Anticonvulsants / Q000494:pharmacology*; D044182:Benzylisoquinolines / Q000494:pharmacology*; D002460:Cell Line; D017024:Chemotherapy, Adjuvant; D004195:Disease Models, Animal; D018432:Drug Resistance, Multiple / Q000187:drug effects*; D000069279:Drug Resistant Epilepsy / Q000188:drug therapy*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D018435:ATP Binding Cassette Transporter, Subfamily B; D000927:Anticonvulsants; D044182:Benzylisoquinolines; C009438:tetrandrine
keywords: P-glycoprotein; multidrug resistance; phenytoin; refractory epilepsy; tetrandrine; valproate