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Ontogenetic characteristics of enzyme activities and plasma metabolites in C57BL/6J:Jcl mice deficient in insulin receptor substrate 2. | LitMetric

AI Article Synopsis

Article Abstract

We have established an inbred line of mice deficient in insulin receptor substrate 2 (IRS2) on a C57BL/6J Jcl genetic background (B6J-IRS2(-/-) mice) as an animal model for typical type 2 diabetes mellitus (DM). We investigated the effect of age and sex on glucose tolerance and insulin resistance and on the activities of enzymes related to lipid metabolism in the liver and skeletal muscle of B6J-IRS2( -/-) mice. Glucose tolerance tests (GTT), insulin tolerance tests (ITT), and sampling for chemical analysis were performed at ages of 6,14, and 24 wk. GTT showed that both genders of B6J-IRs2(-/-) mice had impaired glucose tolerance at the ages of 6 and 14 wk, whereas 24-wk-old female B6J-IRs2(-/-) mice showed glucose tolerance almost comparable to that of wild-type mice; 24-wk-old male B6J-IRs2(-/-) mice still showed impaired glucose tolerance. ITT revealed that both male and female B6J-IRS2(-/-) mice remained insulin-resistant at all time points. Hepatic lipogenetic enzyme activities were higher in B6J-IRS2(-/-) mice than in wild-type mice at 6, 14 and 24 wk of age. In addition, plasma glucose, triglyceride, free fatty acid, total cholesterol, and insulin concentrations in B6J-IRS2(-/-) mice were significantly higher than those in wild-type mice at most time points; plasma triglycerides in 14-wk-old B6J-IRS2(-/-) mice were lower than those of wild-type mice. These findings suggest that young B6J-IRS2(-/-) mice are useful as type 2 DM models.

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