Cisapride:一个潜在的模型底物评估体内细胞色素P4503A4活动。

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洛瑞杰,卡恩斯GL,任SM Nafziger,汗,Kashuba广告,Schuetz如Bertino JS Jr, van den安加约,Leeder JS

Cisapride:一个潜在的模型底物评估体内细胞色素P4503A4活动。

中国新药杂志。2003年3月,73(3):209 - 22所示。doi: 10.1067 / mcp.2003.29。

PubMed ID

12621386 (在PubMed

]

文摘

目的:Cisapride与咪达唑仑体内,以确定其潜在的适用性作为细胞色素P450 (CYP) 3 a4“探针”。As well, we evaluated whether cisapride was transported by P-glycoprotein. METHODS: Bidirectional transport assays were conducted in LLC-PK1 cells and the derivative cell line L-MDR1 to determine whether cisapride was a substrate for P-glycoprotein. A pharmacokinetic study was also conducted in 17 healthy adults (n = 8 women) who received intravenous midazolam (0.025 mg/kg), oral midazolam (0.15 mg/kg), and oral cisapride (0.07 mg/kg) in a randomized crossover design. Plasma concentrations were quantitated from repeated after-dosing blood samples by HPLC with ultraviolet detection for midazolam and HPLC with tandem mass spectrometry detection for cisapride and norcisapride. Pharmacokinetic parameters were determined by noncompartmental methods. Both linear and nonlinear regression analyses were used to examine the association between the apparent plasma clearance of midazolam and cisapride and the cisapride/norcisapride plasma concentration ratios. RESULTS: Although not a substrate for P-glycoprotein, cisapride inhibited P-glycoprotein with an apparent inhibition constant (K(i)) of 16.1 micromol/L. Linear correlations between cisapride clearance and both intravenous and oral midazolam clearance (P =.01, r(2) = 0.43 and P =.001, r(2) = 0.46, respectively) were found. Cisapride/norcisapride plasma concentration ratios at 8 hours (P =.001, r(2) = 0.90) and 12 hours (P =.001, r(2) = 0.96), as well as cisapride plasma concentrations at these time points, were shown to accurately predict the area under the plasma concentration versus time curve for cisapride. CONCLUSIONS: CYP3A4 activity reflected by the total body clearance after oral administration of cisapride should be independent of transport by P-glycoprotein. Concordance between the pharmacokinetics for cisapride and midazolam support the applicability of oral cisapride as a pharmacologic substrate to assess total CYP3A4 activity in vivo. Cisapride plasma concentration ratios at 8 or 12 hours after a single oral cisapride dose may prove useful as a single-point determination to reflect the area under the plasma concentration versus time curve and the plasma clearance of cisapride and, as well, total CYP3A4 activity in vivo.

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药物酶

药物	酶	类	生物	药理作用	行动
Cisapride	细胞色素P450 3 a4	蛋白质	人类	未知的	底物	细节