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| Content Provider | Journal of Biological Chemistry (JBC) |
|---|---|
| Author | Yin, Tinggui Keller, Susanne R. Quelle, Frederick W. Witthuhn, Bruce A. Tsang, Monica Lik-Shing Lienhard, Gustav E. Ihle, James N. Yang, Yu-Chung |
| 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 and distinct tyrosine-phosphorylated proteins. |
| Related Links | http://www.jbc.org/content/270/35/20497.abstract |
| Ending Page | 20502 |
| Starting Page | 20497 |
| Page Count | 6 |
| File Format | HTM / HTML PDF |
| ISSN | 00219258 |
| Journal | Journal of Biological Chemistry (JBC) |
| Issue Number | 35 |
| Volume Number | 270 |
| DOI | 10.1074/jbc.270.35.20497 |
| e-ISSN | 1083351X |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology |
| Publisher Date | 1995-09-01 |
| Access Restriction | Open |
| Subject Keyword | Cell Biology and Metabolism |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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