Effect of Repeated Wuniu Early Tea Administration on the CYP450 Activity Using a Cocktail Method
1The First Affiliated Hospital of Wenzhou Medical College, Wenzhou 325 035, China 2The Second Affiliated Hospital of Wenzhou Medical College, Wenzhou 325 035, China 3Analytical and Testing Center, Wenzhou 325 035, China 4Function Experiment Teaching Center, Wenzhou Medical College, Wenzhou 325 035, China
J S Ma Function Experiment Teaching Center, Wenzhou Medical College, Wenzhou 325 035 China E‑mail: [email protected]
Wuniu early tea (Camellia sinensis) is an important beverage consumed in China. Up to date, a lot of methods for identifying and chemical analysing have been done. However, there is no report on the effects of Wuniu early tea on cytochrome P450 isozymes. Therefore, the present objective of our study was to evaluate the potential effects of Wuniu early tea on cytochrome P450 isozymes P2C9, P1A2, P2C19 and P2B6 in rats with a cocktail approach including, matching probe drugs of tolbutamide, phenacetin, omeprazole and bupropion. These four probe drugs were simultaneously administered to rats after repeated Wuniu early tea administration. The pharmacokinetics of the probes in the plasma was simultaneous determined by high-performance liquid chromatography-mass spectrometry. The t 1/2 and AUC (0-∞) of tolbutamide increased significantly and CL z decreased remarkably in test rats after repeated Wuniu early tea administration. However, the main pharmacokinetic parameters of the other three probe drugs were not significantly different between control and test rats. The findings in this study suggested that Wuniu early tea could inhibit cytochrome P2C9 while did not influence on cytochrome P1A2, cytochrome P2C19 and cytochrome P2B6.