Diabetes, Vol 38, Issue 2 159-163, Copyright © 1989 by American Diabetes Association
Sexual dimorphism of hyperglycemia and glucose tolerance in Wistar fatty rats
RA Kava, DB West, VA Lukasik and MR Greenwood
Biology Department, National Institutes of Health Obesity Research Center, Vassar College, Poughkeepsie, New York 12601.
Obese and lean male and female Wistar fatty rats were fed a high-sucrose
(68% of calories) diet from 5 to 22 wk of age. Obese males, but not obese
females, developed hyperglycemia in the fed state and were more glucose
intolerant during an intragastric glucose tolerance test than obese
females. Lean Wistar fatty rats did not become hyperglycemic on the sucrose
diet. Obese males also showed a smaller insulin response during the glucose
tolerance test than did obese females. The Wistar fatty rat is a sexually
dimorphic model of non-insulin-dependent diabetes mellitus in which the
male but not the female obese rats become diabetic. The diabetic condition
and impaired glucose tolerance in the obese male Wistar fatty rat may be
related to impaired pancreatic insulin release and peripheral insulin
resistance.