Abstract
Radioiodinated human platelet-derived growth factor ( 125I-PDGF), and unlabeled human (Hu), bovine (Bo), and porcine (Po) PDGF were used to study PDGF receptors in human term placental membrane preparations. The binding of 125I-Hu-PDGF was inhibited by unlabeled preparations. Half-maximal occupancy of the binding sites occurred at 7–9 nM of Hu-, Bo- or Po-PDGF. Scatchard analysis of the binding data indicated a single class of receptors having a K d value of about 1.1–1.2 × 10 −10 M. Thus, the sensitive radioreceptor assay does not detect any species specificity of PDGF.
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