Antiobesity effect of diazoxide in obese Zucker rats

Metabolism: Clinical and Experimental
Ramin AlemzadehP Pitukcheewanont

Abstract

Hyperinsulinism and insulin resistance are characteristic findings in obese subjects. Obesity in both humans and experimental animals is associated with a reduced number of insulin receptors and a decreased insulin-mediated glucose disposal, whereas sensitivity to insulin's antilipolytic action is unaltered. To evaluate the antiobesity effect of diazoxide (DZ), an inhibitor of glucose-stimulated insulin release, 7-week-old Zucker obese and lean rats were studied. Obese and lean rats were grouped into DZ-treated (150 mg/kg/d) and control (C) groups. DZ-treated obese rats consumed similar amounts of calories per kilogram body weight (BW) compared with C obese animals, but gained less weight (P<.01). Postabsorptive plasma free fatty acids (FFA), cholesterol, and triglycerides were significantly higher in obese versus lean animals (P<.01). DZ treatment reduced plasma triglyceride levels in obese animals (P<.001), but had no significant effect on FFA or cholesterol concentrations. Plasma glucose concentrations in the postabsorptive state and during glucose tolerance tests (GTTs) were significantly lower in DZ obese versus C obese rats (P<.01) despite a decrease in plasma insulin concentrations in DZ-treated animals (P<.01). In contr...Continue Reading

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