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Interleukin-13 signal transduction in lymphohemopoietic cells. Similarities and differences in signal transduction with interleukin-4 and insulin

Interleukin-13 signal transduction in lymphohemopoietic cells. Similarities and differences in signal transduction with interleukin-4 and insulin

Journal of Biological Chemistry 270(20): 12286-12296

Interleukin-13 (IL-13) and interleukin-4 (IL-4) are related in structure and function and are thought to share a common receptor component. We have investigated the signal transduction pathways activated by these two growth factors, as well as insulin, in cell-lines and primary cells of lymphohemopoietic origin. All three factors induced the tyrosine phosphorylation of a protein of 170 kDa (p170), which coimmunoprecipitated with the p85 subunit of PI3'-kinase, via high affinity interactions mediated by the SH2 domains of p85. Antibodies raised against the entire insulin-receptor substrate-1 (IRS-1) protein immunoprecipitated p170 much less efficiently than they did IRS-1 from 3T3 cells. However, antibodies directed against the conserved pleckstrin homology domain of IRS-1 immunoprecipitated both p170 and IRS-1 with similar efficiency, suggesting they share structural similarities in this region. In lymphohemopoietic cells, IL-13, IL-4, and insulin failed to induce increased tyrosine phosphorylation of She, or its association with grb2, modification of Sosl, or activation of erk-1 and erk-2 mitogen-activated protein kinases, suggesting that p170 mediates downstream pathways distinct from those mediated by IRS-1. Both IL-13 and IL-4 induced low levels of tyrosine phosphorylation of Tyk-2 and Jak-1. IL-4 also activated the Jak-3-kinase, but, despite other similarities, IL-13 did not. Insulin failed to activate any of the known members of the Janus family of kinases. In that Jak-3 is reported to associate with the IL-2-gamma-c chain, these data suggest that the IL-13 receptor does not utilize this subunit. However, both IL-13 and IL-4 induced tyrosine phosphorylation of the IL-4-140 kDa receptor chain, suggesting that this is a component of both receptors in these cells and accounts for the similarities in signaling pathways shared by IL-13 and IL-4.

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Accession: 008898787

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PMID: 7744881

DOI: 10.1074/jbc.270.20.12286

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