Insulin receptor substrate-2 is the major 170-kDa protein phosphorylated on tyrosine in response to cytokines in murine lymphohemopoietic cells.

The Journal of Biological Chemistry
M J WelhamJ W Schrader

Abstract

Insulin receptor substrate 1 (IRS-1), and its structural relative IRS-2, are both phosphorylated on tyrosine following treatment of cells with interleukin-4 (IL-4) and insulin. We have investigated whether both IRS-1 and IRS-2 are expressed in murine lymphohemopoietic cells. T and B lymphocytes and macrophages from primary cultures expressed only IRS-2, which became phosphorylated on tyrosine following stimulation with both IL-4 and insulin. Likewise, the murine myeloid cell line FD-5 expressed only IRS-2, which was tyrosine phosphorylated in response to IL-4 and insulin, as well as interleukin-3 and granulocyte-macrophage colony stimulating factor. Neither IRS-1 nor IRS-2 were expressed at detectable levels in primary bone marrow mast cells although these cells do respond to IL-4. Moreover, a factor-dependent lymphocyte cell line, CT.4S, which grows continuously in IL-4, did not express detectable levels of IRS-1 or IRS-2. IRS-2 from FD-5 cells stimulated with either IL-4 or insulin bound to glutathione S-transferase fusion proteins of the p85 subunit of phosphoinositol 3'-kinase, Grb2, and Syp, paralleling reported associations of IRS-1 with these molecules and indicating phosphorylation of the corresponding residues on IRS-2.

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