PubMed:7613138 JSONTXT

{"target":"http://pubannotation.org/docs/sourcedb/PubMed/sourceid/7613138","sourcedb":"PubMed","sourceid":"7613138","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/7613138","text":"The interleukin-5/receptor interaction activates Lyn and Jak2 tyrosine kinases and propagates signals via the Ras-Raf-1-MAP kinase and the Jak-STAT pathways in eosinophils.\nWe have shown that the interaction of interleukin (IL)-5 with the receptor activates Lyn tyrosine kinase within 1 min and Jak2 tyrosine kinase within 1-3 min. IL-5 also stimulates GTP binding to p21ras. The signal is subsequently propagated through the activation of Raf-1, MEK, and MAP kinases as shown by their increased autophosphorylation in vitro and phosphorylation in situ. Jak2 kinase has been shown to phosphorylate STAT nuclear proteins. The activation of STAT nuclear factors was studied by electrophoretic mobility shift assay using a gamma activation site (GAS) probe. We found that IL-5 induces two GAS-binding proteins in eosinophils, one of which is STAT1. We conclude that IL-5 induced signals are propagated through two distinct pathways: (1) Lyn--\u003eRas--\u003eRaf-1--\u003eMEK--\u003eMAP kinase and (2) 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