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Insulin receptor substrate-1 mediates phosphatidylinositol 3'-kinase and p70S6k signaling during insulin, insulin-like growth factor-1, and interleukin-4 stimulation.

Open AccessPublished:November 18, 1994DOI:https://doi.org/10.1016/S0021-9258(19)61974-5
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      Insulin Receptor Substrate-1 (IRS-1) is an endogenous cellular protein that is tyrosine phosphorylated during stimulation of cells with insulin, IGF-1, and interleukin 4 (IL-4). Phosphorylated IRS-1 regulates multiple regulatory pathways by recruiting signaling molecules containing Src homology 2 domains (SH2 proteins). The 32D myeloid progenitor cell line contains few insulin receptors and no detectable IRS-1. Expression of the insulin receptor alone partially mediates insulin-stimulated microtubule-associated protein (MAP) kinase activation, and the addition of IRS-1 enhances this effect (Myers, M. G., Jr., Wang, L.-M., Sun, X. J., Zhang, Y., Yenush, L. P., Schlessinger, J., Pierce, J. H., and White, M. F. (1994) Mol. Cell. Biol. 14, 3577-3587). Alone, insulin receptors mediate phosphatidylinositol (PI) 3'-kinase and p70S6k activation poorly if at all during insulin stimulation. Expression of IRS-1 alone in 32D cells mediates the stimulation of p70S6k by insulin, IGF-1, or IL-4; addition of insulin receptor to these cells increases the sensitivity of the insulin response. In contrast, full insulin stimulation of PI 3'-kinase requires both the insulin receptor and IRS-1, suggesting that a high level of IRS-1 phosphorylation is required for insulin-stimulated PI 3'-kinase activation, whereas a low level of IRS-1 tyrosine phosphorylation transmits an essential signal to p70S6k. Both insulin receptors and IRS-1 are required for mitogenic signaling in 32D cells suggesting that MAP kinase or p70S6k alone are not sufficient, and that both or additional unknown IRS-1-mediated signals are necessary.

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