Abstract
Autoinduction of PDGF-A-chain mRNA's was demonstrated in cells of a human malignant melanoma cell line (HTZ 19), indicating a PDGF-induced amplification of an autocrine growth factor loop mechanism. PDGF-alpha receptors were detected by immunocytochemistry in HTZ 19 melanoma cells. Exogenously administered PDGF-AA exerted an increase in cell proliferation by 70% at 200 ng/ml PDGF in ...
Abstract
Autoinduction of PDGF-A-chain mRNA's was demonstrated in cells of a human malignant melanoma cell line (HTZ 19), indicating a PDGF-induced amplification of an autocrine growth factor loop mechanism. PDGF-alpha receptors were detected by immunocytochemistry in HTZ 19 melanoma cells. Exogenously administered PDGF-AA exerted an increase in cell proliferation by 70% at 200 ng/ml PDGF in serum-supplemented cell culture medium. Antisense phosphorothioate-oligodeoxynucleotides (S-ODN's), specifically targeted against PDGF-A-chain mRNA, reduced cell proliferation of HTZ 19 melanoma cells by 62% at a concentration of 5.0 microM, also only in serum-enriched medium. These findings strongly suggest that PDGF-AA homodimers may be an autocrine growth factor for HTZ 19 melanoma cells but require synergistic interaction with serum components.
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