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. 1981 Jun;78(6):3664–3668. doi: 10.1073/pnas.78.6.3664

Specific receptors for platelet-derived growth factor on cells derived from connective tissue and glia.

C H Heldin, B Westermark, A Wasteson
PMCID: PMC319631  PMID: 6943569

Abstract

A cellular receptor for platelet-derived growth factor (PDGF) was demonstrated by incubation of 125I-labeled PDGF with human foreskin fibroblast cultures followed by liberation of cell-bound radioactivity with Triton X-100. The cellular binding of labeled PDGF in the presence of increasing amounts of unlabeled PDGF showed saturation; Scatchard analysis of binding data indicated a single class of receptors having kd = 1 X 10(-9) M. The number of PDGF binding sites was approximately 3 X 10(5)/cell. Labeled PDGF binding reached an apparent equilibrium after 3 hr at 4 degrees C. At 37 degrees C, it passed a maximum after 30 min and then decreased with time due to degradation of the tracer. A large excess of unlabeled PDGF reduced labeled PDGF binding by more than 90% whereas similar doses of epidermal growth factor, fibroblast growth factor, or insulin had no effect. It was concluded that PDGF did not share receptors with these factors. PDGF receptors were found on skin fibroblasts, normal and malignant glial cells, smooth muscle cells, and 3T3 cells but not on epithelial-derived cells, neuroblastoma cells, endothelial cells, or peripheral lymphocytes.l As only the receptor-positive cells--i.e., the connective tissue- and glia-derived cells--are responsive to stimulation with PDGF, these findings imply a functional significance of the PDGF receptor.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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