Abstract：
:Oncostatin M (OM) is a polypeptide cytokine that induces autocrine and paracrine effects on AIDS-Kaposi's sarcoma (KS) cells (Nair et al., Science, 255, 1430-1432, 1992; Miles et al., Science, 255, 1432-1434, 1992). The signalling pathways underlying this activation are largely unknown. We have found that OM binding to KS cell lines in vitro identifies a higher affinity binding site (Kd 10-20 pM) with a lower affinity (Kd 1.5 nM), high capacity binding site. The binding of OM to its receptor at the KS cell surface stimulates a rapid tyrosine phosphorylation of multiple proteins, including the p85 regulatory subunit of phosphatidylinositol-3-kinase (PI3K). In addition OM can stimulate the in vivo activation of PI3K and increases the PI3K activity in anti-phosphotyrosine and anti-src kinase family antibody directed immunoprecipitates. Genistein, an inhibitor of tyrosine kinases, inhibits the synthesis of phosphatidylinositol 3,4-biphosphate and the growth of KS cells. Finally, OM enhances tyrosine kinase activity in immune complex kinase assay performed with antibody anti-src kinase family. These data suggest that in KS cells OM can stimulate formation of tyrosine kinase co-ordinate signalling complexes, containing at least src kinase family and PI3K, which can drive the accumulation of the putative second-messengers D3-phosphorylated phosphoinositides.
journal_name
Oncogenejournal_title
Oncogeneauthors
Soldi R,Graziani A,Benelli R,Ghigo D,Bosia A,Albini A,Bussolino Fsubject
Has Abstractpub_date
1994-08-01 00:00:00pages
2253-60issue
8eissn
0950-9232issn
1476-5594journal_volume
9pub_type
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