Abstract
The growth of normal diploid fibroblasts is generally thought to be tightly controlled by exogenous growth factors such as platelet-derived growth factor (PDGF) and epidermal growth factor (EGF). Subversion of a growth factor pathway at a regulatory point is considered to be a key event in neoplastic transformation and tumorigenesis1. Thus, simian sarcoma virus has acquired the gene encoding the B-chain of PDGF2–4 and there is direct experimental proof that SSV-transformation is mediated by a PDGF-like growth factor5. There is accumulating evidence that PDGF-like molecules are also synthesized and released by certain normal cells6–3, suggesting an important role of cellularly produced PDGF in development and tissue regeneration. We now present evidence that a transient expression of the gene encoding the PDGF A-chain, and the synthesis and release of functional A-chain homodimers, is an early event in the prereplicative phase of normal human foreskin fibroblasts exposed to PDGF or EGF. Since these cells are PDGF-responsive, the results imply the existence of a positive autocrine signal that may serve as an amplifier of the mitogenic response under certain conditions.
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Paulsson, Y., Hammacher, A., Heldin, CH. et al. Possible positive autocrine feedback in the prereplicative phase of human fibroblasts. Nature 328, 715–717 (1987). https://doi.org/10.1038/328715a0
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DOI: https://doi.org/10.1038/328715a0
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