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

Journal Article · · Proc. Natl. Acad. Sci. U.S.A.; (United States)
The authors 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. 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 M/sub r/ 24,000 intracellular protein and two polypeptides of M/sub r/ 13,000 and 11,500 released into the medium. The M/sub r/ 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.
Research Organization:
Univ. of Uppsala, Sweden
OSTI ID:
6170969
Journal Information:
Proc. Natl. Acad. Sci. U.S.A.; (United States), Journal Name: Proc. Natl. Acad. Sci. U.S.A.; (United States) Vol. 82:6; ISSN PNASA
Country of Publication:
United States
Language:
English

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