The Journal of Immunology, Vol 149, Issue 5 1676-1682, Copyright © 1992 by American Association of Immunologists

ARTICLES

Oncostatin M induces tyrosine phosphorylation in endothelial cells and activation of p62yes tyrosine kinase

GL Schieven, JC Kallestad, TJ Brown, JA Ledbetter and PS Linsley
Bristol-Myers Squibb Pharmaceutical Research Institute, Seattle, WA 98121.

Oncostatin M is a polypeptide cytokine produced by activated and transformed T lymphocytes that has diverse biologic effects, including growth inhibition of tumor cells and induction of IL-6 expression in cultured human endothelial cells (HEC). HEC are highly responsive to oncostatin M and express high levels of oncostatin M receptors relative to other cell types. Oncostatin M has previously been found to bind a specific receptor of 150 to 160 kDa. We have found through the use of anti-phosphotyrosine immunoblotting that oncostatin M induces tyrosine phosphorylation in HEC. Anti-phosphotyrosine antibodies specifically immunoprecipitated labeled oncostatin M cross-linked to its receptor, demonstrating that the oncostatin M receptor is either directly phosphorylated on tyrosine after ligand binding or is tightly associated with a phosphotyrosyl protein in these cells. The tyrosine kinase inhibitor herbimycin A blocked the induction of IL-6 by oncostatin M in HEC. In addition, immune complex kinase assays showed that oncostatin M markedly increased the activity of the p62yes tyrosine kinase with a small increase in p59fyn but no increase in p56lyn tyrosine kinase activity in HEC. We conclude that oncostatin M utilizes a tyrosine phosphorylation signal transduction pathway in HEC involving the activation of the p62yes tyrosine kinase, and that this tyrosine phosphorylation pathway leads to the induction of IL-6 expression.

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