Ontogenetic Characteristics of Enzyme Activities and Plasma Metabolites in C57BL/6J:Jcl Mice Deficient in Insulin Receptor Substrate 2
Abstract:We have established an inbred line of mice deficient in insulin receptor substrate 2 (IRS2) that have 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 almost glucose tolerance comparable to that of wild-type mice, although 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.
Document Type: Research Article
Publication date: June 1, 2006
Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.
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