Evaluation of antipsychotic drugs as inhibitors of multidrug resistance transporter P-glycoprotein.
Evaluation of antipsychotic drugs as inhibitors of multidrug resistance transporter P-glycoprotein.
复制标题
抗精神病药物作为多药耐药转运蛋白 P-糖蛋白抑制剂的评价。
DOI：
10.1007/s00213-006-0437-9
复制
发表时间：
2006
影响因子：
3.4
通讯作者：
DeVane,CLindsay
中科院分区：
文献类型：
--
作者：
Wang,Jun-Sheng;Zhu,Hao-Jie;Markowitz,JohnS;Donovan,JenniferL;DeVane,CLindsay
RationaleThe multidrug resistance transporter, P-glycoprotein (P-gp), is involved in efflux transport of several antipsychotics in the blood–brain barrier (BBB).ObjectivesIn the present study, we evaluated the inhibitory effect of the antipsychotics, i.e., risperidone, olanzapine, quetiapine, clozapine, haloperidol, chlorpromazine, a major metabolite of risperidone, 9-OH-risperidone, and a positive control inhibitor, PSC833, on the cellular uptake of a prototypic substrate of P-gp, rhodamine (Rhd) 123, in LLC-PK1 and L-MDR1 cells.Materials and methodsAfter incubation of the antipsychotics (1–100 μM) and the positive (10 μM PSC833) or negative (1% dimethyl sulfoxide) controls with 5 μM Rhd 123 for 1 h, the effects of the antipsychotics on the intracellular accumulation of Rhd 123 were examined using a flow cytometric method.ResultsAll the antipsychotics showed various degrees of inhibitory effects on P-gp activity. The rank order of the concentration of inhibitor to cause 50% of the maximal increment of intracellular Rhd 123 fluorescence (EC50) was: PSC833 (0.5 μM) < olanzapine (3.9 μM) < chlorpromazine (5.8 μM) < risperidone (6.6 μM) < haloperidol (9.1 μM) < quetiapine (9.8 μM) < 9-OH-risperidone (12.5 μM) < clozapine (30 μM). Considering that the antipsychotics’ plasma concentrations are generally lower than 1 μM, the present results suggest that olanzapine and risperidone are the only agents that may inhibit P-gp activity in the BBB. However, most of the antipsychotics are extensively accumulated in tissues. In addition, when given orally, the drug concentrations in the gastrointestinal tract are likely to be high.ConclusionsPharmacokinetic interactions due to inhibition of P-gp activity by the antipsychotics appear possible and warrant further investigation.
