Abstract
Human type 2 diabetes is characterized by defects in both insulin action and insulin secretion. It has been difficult to identify a single molecular abnormality underlying these features. Insulin-receptor substrates (IRS proteins) may be involved in type 2 diabetes: they mediate pleiotropic signals initiated by receptors for insulin and other cytokines1. Disruption of IRS-1 in mice retards growth, but diabetes does not develop because insulin secretion increases to compensate for the mild resistance to insulin2,3. Here we show that disruption of IRS-2 impairs both peripheral insulin signalling and pancreatic β-cell function. IRS-2-deficient mice show progressive deterioration of glucose homeostasis because of insulin resistance in the liver and skeletal muscle and a lack of β-cell compensation for this insulin resistance. Our results indicate that dysfunction of IRS-2 may contribute to the pathophysiology of human type 2 diabetes.
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Acknowledgements
We thank A. Nagy for R1 cells; M. Ginsberg, M. Petruzelli and M. Taneja for technical support; B. Cheatham for the anti-IRβ antibody. Blastocyst injections were performed in the Core Laboratory of the Diabetes and Endocrinology Research Center, Vanderbilt University. This work was supported by grants from the NIH to G.I.S., S.B.W. and M.F.W. D.J.W. is supported by an MRC (UK) Clinician Scientist Fellowship. D.J.B. was supported by a grant from the JDFI. J.S.G. and D.B. were supported by grants from the Spanish Government.
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Withers, D., Gutierrez, J., Towery, H. et al. Disruption of IRS-2 causes type 2 diabetes in mice. Nature 391, 900–904 (1998). https://doi.org/10.1038/36116
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DOI: https://doi.org/10.1038/36116