Insulin receptor substrate 4 supports insulin- and interleukin 4-stimulated proliferation of hematopoietic cells - PubMed (original) (raw)
. 1999 Jul 14;260(3):718-23.
doi: 10.1006/bbrc.1999.0967.
Affiliations
- PMID: 10403832
- DOI: 10.1006/bbrc.1999.0967
Free article
Insulin receptor substrate 4 supports insulin- and interleukin 4-stimulated proliferation of hematopoietic cells
V R Fantin et al. Biochem Biophys Res Commun. 1999.
Free article
Abstract
Signaling from the activated insulin receptor is initiated by its tyrosine phosphorylation of the insulin receptor substrates (IRSs). The IRSs then act as docking/effector proteins for various signaling proteins containing src homology 2 domains. Four members of the IRS family, designated IRS-1 through IRS-4, have been identified. Although these IRSs show considerable structural homology, the extent to which they overlap in functions has not been explored in detail. The 32D hematopoietic cell line, which contains no detectable amounts of any IRS, provides a system in which to determine whether an IRS supports cell proliferation. Previous studies have shown that introduction of IRS-1 or -2 into 32D cells overexpressing the insulin and IL-4 receptors (32D-R cells) enables the cells to undergo mitogenesis in response to insulin and IL-4. In the present study, we have examined IRS-4, a member of the IRS family that we recently discovered, in this system. Expression of IRS-4 in 32D-R cells permitted the cells to undergo mitogenesis and continuous proliferation in response to insulin and IL-4. Immunoblotting of phosphotyrosine proteins showed that insulin and IL-4 elicited the tyrosine phosphorylation of IRS-4 in these cells. Thus, IRS-4, like IRS-1 and -2, can function in the signal transduction pathways linking insulin and IL-4 receptors to cell proliferation.
Copyright 1999 Academic Press.
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