Interleukin-9 induces tyrosine phosphorylation of insulin receptor substrate-1 via JAK tyrosine kinases.

The Journal of Biological Chemistry
T YinY C Yang

Abstract

Interleukin (IL)-9 stimulates the proliferation of a variety of hematopoietic lineages through its interaction with a receptor of the cytokine receptor superfamily. In the studies presented here, we have begun to characterize the downstream signaling pathways activated by IL-9. In addition to the activation of JAK1 and JAK3 tyrosine kinases, IL-9, unlike most hematopoietic cytokines but similar to IL-4, induces the tyrosine phosphorylation of a 170-kDa protein that is related to the insulin receptor substrate-1 (IRS-1). We further demonstrate for the first time that IRS-1 is not only associated with JAK1 but also tyrosine phosphorylated and functionally involved in IL-9 signaling in TS1 lymphocytes transfected with the murine IRS-1 cDNA. Cotransfection studies and in vitro experiments directly demonstrate that JAK1, JAK2, or JAK3 is capable of tyrosine phosphorylating IRS-1, suggesting a functional role for these kinases in vivo. Lastly, we demonstrate that IL-9 induces the tyrosine phosphorylation of Stat3 and in this regard differs from IL-4, which triggers tyrosine phosphorylation of Stat6. Taken together, these results strongly suggest that IL-9 and IL-4 utilize common and unique signaling pathways via inducing the similar ...Continue Reading

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