Background. This study was to explore the pharmacokinetics of saxagliptin (Sax) in Goto Kakizaki (GK) rats complicated with depression induced by chronic unpredicted mild stress (CUMS). 'The comorbidity of diabetic patients with depression is becoming more and more epidemic. Whether depression mental disorder alters the pharmacokinetics of hypoglycemic drugs in diabetes patients is not clear. Methods. Five-week-old male GK rats were kept in the cage for 7 weeks in a specific pathogen free (SPF)-grade lab until the emergence of diabetes and were then divided into two groups: control group and depression model group. Rats in the CUIVISinduced depression group were exposed to a series of stressors for 8 weeks. Plasma serotonin and dopamine levels and behavior of open-field test were used to confirm the establishment of the depression model. All rats were given 0.5 mg/kg Sax orally after 8 weeks and blood samples were collected at different time points. Tile Sax concentration was. assayed by high performance liquid chromatograpby-tandem mass spectrometry (HPLC-MS/MS). The CYP450 activity of the liver microsomes was determined by using l cocktails of probe drugs in which the activities of CYP enzymes were assessed througi the determination of the production of the probe drugs. Results. Statistically significant differences in Sax pharmacokinetics were observed for area under curve, clearance, peak concentration, peak time and mean residence time between the depression rats and the control rats, while no statistical differences were observed for half-time and distribution volume by HPLC-MS/MS analysis. The CYP450 activity had different changes in the depression group. Conclusions. These results indicated that GUMS-induced depression alters the drug metabolic process of Sax and CYP450 activity of the liver microsomal enzymes in GK rats.
[1]Liaoning Med Univ, Dept Pharm, Fengxian Cent Hosp Grad Training Base, Shanghai, Peoples R China.
[2]Southern Med Univ, Affiliated Fengxian Cent Hosp, Dept Pharm, Shanghai, Peoples R China.
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