Abstract
Postreceptor insulin resistance was studied in liver, muscle and adipose tissue from NMRI mice of both sexes made diabetic by long-term fat-feeding. Intravenous glucose tolerance tests showed a combination of impaired glucose tolerance and increased plasma insulin concentrations consistent with insulin resistance and reduced peripheral and hepatic uptake of glucose. In the morning, the fat-fed mice were normoinsulinaemic and hyperglycaemic. Liver glucokinase activity and glycogen content were reduced whereas lactate dehydrogenase activity was enhanced. Fatty acid synthase activity was decreased but glucose 6-phosphate dehydrogenase and the rate limiting enzyme in fatty acid synthesis, acetyl CoA carboxylase, were both unaffected. In muscle, the proportion of glycogen synthase in the active I-form was decreased. Total glycogen synthase activity was not affected. In isolated adipocytes, basal and insulin-stimulated glucose oxidation, as well as basal and insulin-stimulated lipogenesis from glucose were all severely inhibited, oxidation more so than lipogenesis. It is concluded that insulin resistance and postreceptor metabolic disorders in liver, muscle and adipose tissue from mice made diabetic by long-term fat-feeding are very similar to those demonstrated in human type 2 diabetics and may be studied in more detail and with more ease in this particular animal model.
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Hedeskov, C.J., Capito, K., Islin, H. et al. Long-term fat-feeding-induced insulin resistance in normal NMRI mice: postreceptor changes of liver, muscle and adipose tissue metabolism resembling those of type 2 diabetes. Acta Diabetol 29, 14–19 (1992). https://doi.org/10.1007/BF00572823
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DOI: https://doi.org/10.1007/BF00572823