期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms14892
关键词
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资金
- NIH [R01 DK031036, R01 DK033201, T32 DK007260-37, K08 DK100543]
- Manpei Suzuki Diabetes Foundation
- Japan Society for the Promotion of Science
- German Research Foundation (DFG) [Kl2399-4/1]
- Federal Ministry of Education and Research (German Center for Diabetes Research) [01GI092]
- The Joslin Diabetes Center DRC Genomics and Bioinformatics Core [P30 DK36836]
Despite a high degree of homology, insulin receptor (IR) and IGF-1 receptor (IGF1R) mediate distinct cellular and physiological functions. Here, we demonstrate how domain differences between IR and IGF1R contribute to the distinct functions of these receptors using chimeric and site-mutated receptors. Receptors with the intracellular domain of IGF1R show increased activation of Shc and Gab-1 and more potent regulation of genes involved in proliferation, corresponding to their higher mitogenic activity. Conversely, receptors with the intracellular domain of IR display higher IRS-1 phosphorylation, stronger regulation of genes in metabolic pathways and more dramatic glycolytic responses to hormonal stimulation. Strikingly, replacement of leucine(973) in the juxtamembrane region of IR to phenylalanine, which is present in IGF1R, mimics many of these signalling and gene expression responses. Overall, we show that the distinct activities of the closely related IR and IGF1R are mediated by their intracellular juxtamembrane region and substrate binding to this region.
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