PURPOSE: To investigate the effect of diabetes mellitus induced by alloxan (DMIA) or streptozotocin (DMIS) on the pharmacokinetics of omeprazole in rats. It has been reported that omeprazole is primarily metabolized via hepatic CYP1A2, 2D1, and 3A1 in rats. The expression and mRNA levels of hepatic CYP1A2 and 3A1 increases in DMIA and DMIS rats, but the expression of hepatic CYP2D1 does not change in DMIS rats. In addition, the metabolic activities of intestinal CYP3A1/2 decreases in DMIS rats. Thus, it could be expected that the pharmacokinetics of omeprazole would be affected by changes in both DMIA and DMIS. METHODS: Omeprazole was administered intravenously (20 mg/kg) and orally (40 mg/kg) to DMIA and DMIS rats and their respective controls. RESULTS: After intravenous administration of omeprazole, the CLNR of the drug was significantly faster in DMIA (52.6 versus 67.4 mL/min/kg) and DMIS (50.2 versus 73.0 mL/min/kg) rats than the respective controls. However, after oral administration of omeprazole, the AUC was comparable between each type of diabetic rat and the respective controls. CONCLUSIONS: The significantly faster CLNR of intravenous omeprazole could be due to increased expression and mRNA levels of hepatic CYP1A2 and 3A1 in both types of diabetic rat. The comparable AUC of oral omeprazole could be due to a decrease in the intestinal first-pass effect of omeprazole caused by decreased intestinal CYP3A1/2 in diabetic rats. Following both intravenous and oral administration in DMIA and DMIS rats, the pharmacokinetics of omeprazole were similarly altered.
PURPOSE: To investigate the effect of diabetes mellitus induced by alloxan (DMIA) or streptozotocin (DMIS) on the pharmacokinetics of omeprazole in rats. It has been reported that omeprazole is primarily metabolized via hepatic CYP1A2, 2D1, and 3A1 in rats. The expression and mRNA levels of hepatic CYP1A2 and 3A1 increases in DMIA and DMISrats, but the expression of hepatic CYP2D1 does not change in DMISrats. In addition, the metabolic activities of intestinal CYP3A1/2 decreases in DMISrats. Thus, it could be expected that the pharmacokinetics of omeprazole would be affected by changes in both DMIA and DMIS. METHODS:Omeprazole was administered intravenously (20 mg/kg) and orally (40 mg/kg) to DMIA and DMISrats and their respective controls. RESULTS: After intravenous administration of omeprazole, the CLNR of the drug was significantly faster in DMIA (52.6 versus 67.4 mL/min/kg) and DMIS (50.2 versus 73.0 mL/min/kg) rats than the respective controls. However, after oral administration of omeprazole, the AUC was comparable between each type of diabeticrat and the respective controls. CONCLUSIONS: The significantly faster CLNR of intravenous omeprazole could be due to increased expression and mRNA levels of hepatic CYP1A2 and 3A1 in both types of diabeticrat. The comparable AUC of oral omeprazole could be due to a decrease in the intestinal first-pass effect of omeprazole caused by decreased intestinal CYP3A1/2 in diabeticrats. Following both intravenous and oral administration in DMIA and DMISrats, the pharmacokinetics of omeprazole were similarly altered.
Authors: Teresa Maria J P Carvalho; Ricardo de Carvalho Cavalli; Sérgio P Cunha; Cláudia O de Baraldi; Maria P Marques; Natalícia J Antunes; Ana Leonor P C Godoy; Vera Lucia Lanchote Journal: Eur J Clin Pharmacol Date: 2010-09-17 Impact factor: 2.953
Authors: Sumanta Kumar Goswami; Bora Inceoglu; Jun Yang; Debin Wan; Sean D Kodani; Carlos Antonio Trindade da Silva; Christophe Morisseau; Bruce D Hammock Journal: Toxicol Appl Pharmacol Date: 2015-11-10 Impact factor: 4.219