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. 1985 Mar;82(6):1721–1725. doi: 10.1073/pnas.82.6.1721

Platelet-derived growth factor agonist activity of a secreted form of the v-sis oncogene product.

A Johnsson, C Betsholtz, K von der Helm, C H Heldin, B Westermark
PMCID: PMC397344  PMID: 2984666

Abstract

We have compared the functional properties of a growth factor partially purified from medium conditioned by simian sarcoma virus-transformed cells with those of platelet-derived growth factor (PDGF). The factor mimicked the effects induced by PDGF: it bound to and activated human fibroblast PDGF receptors and stimulated DNA synthesis. These activities were specifically inhibited by PDGF antibodies and thus elicited by a factor(s) immunologically related to PDGF. The factor behaved as a secretory protein, since about 95% of the receptor-binding activity was found in the medium after a 48-hr serum-free incubation. Structural characterization of the PDGF-like activity revealed a Mr 24,000 intracellular protein and two polypeptides of Mr 13,000 and 11,500 released into the medium. The Mr 13,000 component bound to human fibroblasts; this binding was competitively inhibited by PDGF. The data support the possibility that oncogene products may elicit transforming activity by interacting with the normal cellular mitogenic pathway.

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