Effect of chronic unpredicted mild stress-induced depression on clopidogrel pharmacokinetics in rats

Background. Clopidogrel is widely used to prevent and treat cardiovascular atheroscle-rosis and thrombosis. However, disturbance in the expression and activity of liver cytochrome metabolic enzymes significantly changes clopidogrel efficacy. Therefore, the effect of chronic unpredictable mild stress (CUMS)-induced depression on the expression of liver cytochrome metabolic enzymes and clopidogrel pharmacokinetics in rats were explored. Methods. Nine different CUMSs were selected to establish a rat model of depression. Open field experiment and sucrose preference test were applied to explore the depressive behaviors. The concentration of serotonin in the cortex of depressed rats was determined using enzyme linked immunosorbent assay (ELISA). All rats were given 10 mg/kg clopidogrel orally after 12 weeks, and blood samples were collected at different time points. The clopidogrel concentration and CYP2C19/ CYP2C9 activity in rat liver microsomes were assayed by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The rat liver drug enzymes expression was determined by Real-Time Quantitative Reverse Transcription PCR (RT-qPCR).Results. Open field experiment and sucrose preference test indicated the successful construction of the CUMS-induced depression model. The concentration of serotonin in the cortex of depressed rats decreased by 42.56% (**p < 0.01). The area under the curve of clopidogrel pharmacokinetics decreased by 33.13% (*p < 0.05) in the depression rats, while distribution volume and clearance increased significantly (**p < 0.01). The half-time and distribution volume did not significantly differ. The CYP2C19 and CYP2C9 activity of liver microsomes in the CUMS-induced depression group were significantly higher than that in the control group (**p < 0.01). CYP2C11 and CYP1A2 mRNA expression up-regulated approximately 1.3 -fold in the depressed rat livers compared with that in the control, whereas that of CYP2C13 was down-regulated by 27.43% (**p < 0.01). CYP3A1 and CYP2C12 expression were slightly up-regulated, and that of CES1 did not change.Conclusions. These results indicated that CUMS-induced depression altered clopido-grel pharmacokinetics, and the change in CYP450 activity and expression in depressed rat livers might contribute to the disturbance of clopidogrel pharmacokinetics.