Platelet-derived growth factor. I. High yield purification and evidence for multiple forms - PubMed (original) (raw)
. 1982 May 10;257(9):5154-60.
- PMID: 7068680
Free article
Platelet-derived growth factor. I. High yield purification and evidence for multiple forms
E W Raines et al. J Biol Chem. 1982.
Free article
Abstract
Platelet-derived growth factor has been purified from human outdated platelet-rich plasma with a 21% overall yield. This five-step procedure represents a 500,000-fold purification over serum. 6.4 ng/ml (2 X 10(-10) M) of purified platelet-derived growth factor stimulated DNA synthesis in quiescent, density arrested cultures of Swiss 3T3 cells to a level equivalent to that produced by 5% calf serum. The growth-promoting activity and specific binding to 3T3 cells has been shown to be associated with four entities of molecular weights: 31,000, 29,000, 28,500, and 27,000, as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under nonreducing conditions. In the presence of 2-mercaptoethanol, the four molecular species are converted to three inactive chains of lower molecular weights: 17,500, 16,000, and 14,400. Other methods of chemically cleaving the disulfide bonds were investigated: reductive cleavage by S-sulfonation, reductive cleavage with dithiothreitol, and performic acid oxidation. In all cases, mitogenic activity was reduced by 80-100%. Attempts to restore mitogenic activity after reduction were unsuccessful. Two-dimensional 125I-peptide mapping of the nonreduced and reduced multiple forms was also investigated. The four nonreduced moieties gave basically identical maps. The maps of the reduced 17,500- and 16,000-dalton chains were also essentially identical, but the map of the reduced 14,400-dalton chain was significantly different. We propose that platelet-derived growth factor consists of two polypeptide chains: a 14,400-dalton chain and either a 17,500- or a 16,000-dalton chain.
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