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. 1995 Feb;15(2):1102–1109. doi: 10.1128/mcb.15.2.1102

DNA synthesis induced by some but not all growth factors requires Src family protein tyrosine kinases.

S Roche 1, M Koegl 1, M V Barone 1, M F Roussel 1, S A Courtneidge 1
PMCID: PMC232016  PMID: 7823926

Abstract

The Src family of protein tyrosine kinases have been implicated in the response of cells to several ligands. These include platelet-derived growth factor (PDGF), epidermal growth factor (EGF), and colony stimulating factor type 1 (CSF-1, in macrophages and in fibroblasts engineered to express the receptor). We recently described a microinjection approach which we used to demonstrate that Src family kinases are required for PDGF-induced S phase entry of fibroblasts. We now use this approach to ask whether other ligands also require Src kinases to stimulate cells to replicate DNA. An antibody specific for the carboxy terminus of Src, Fyn, and Yes (anti-cst.1) inhibited Src kinase activity in vitro and caused morphological reversion of Src transformed cells in vivo. Microinjection of this antibody was used to demonstrate that Src kinases were required for both CSF-1 and EGF to drive cells into the S phase. Expression of a kinase-inactive form of Src family kinases also prevented EGF- and CSF-1-stimulated DNA synthesis. However, even though the Src family kinases were necessary for both PDGF- and EGF-induced DNA synthesis in Swiss 3T3 cells, the responses to two other potent growth factors for these cells, lysophosphatidic acid and bombesin, were unaffected by the neutralizing antibodies. Therefore, some but not all growth factors required functional Src family kinases to transmit mitogenic responses.

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Selected References

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