Abstract
Type 2 diabetes is a complex metabolic disorder characterized by peripheral insulin resistance and impaired Β cell function1,2. Insulin resistance is inherited as a non-mendelian trait3. In genetically predisposed individuals, resistance of skeletal muscle and adipose tissue to insulin action precedes the onset of clinical diabetes, and is thought to contribute to hyperglycaemia by leading to impaired Β cell function and increased hepatic glucose production4,5. It is not clear whether Β cell and liver defects are also genetically determined2. To test the hypothesis that insulin resistance in muscle and fat is sufficient to cause type 2 diabetes in the absence of intrinsic Β cell and liver abnormality, we generated transgenic mice that were insulin-resistant in skeletal muscle and adipose tissue. These mice developed all the prodromal features of type 2 diabetes but, despite the compounded effect of peripheral insulin resistance and a mild impairment of Β cell function, failed to become diabetic. These findings indicate the need for a critical re-examination of the primary site(s) of insulin resistance in diabetes.
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Acknowledgements
We thank P. Rogliani for help with the Pck2 measurements, J. Nakae for the analysis of insulin receptor expression in islets, I. Atwater and A. Cotterell for performing islet microdissection and perfusion experiments. We also thank C.R. Kahn for helpful comments and sharing unpublished information, S. Cushman for support and advice and K. Rother for critical reading of the manuscript. The work was supported in part by a grant from the American Diabetes Association and by a generous gift of Sigma Tau Corp. to D.A. D.L. is supported by a fellowship grant from the University of Rome 'La Sapienza'.
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Lauro, D., Kido, Y., Castle, A. et al. Impaired glucose tolerance in mice with a targeted impairment of insulin action in muscle and adipose tissue. Nat Genet 20, 294–298 (1998). https://doi.org/10.1038/3112
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DOI: https://doi.org/10.1038/3112