Abstract
Human leukemia cells in culture (HL-60) synthesize and secrete proteins that are recognized by antiserum to human platelet-derived growth factor (PDGF). The molecular mass of the intracellular proteins immunoprecipitated by PDGF antiserum ranged from 34 kDa to 240 kDa. PDGF-related proteins were also identified in the conditioned medium of the cells. Several of these immunoprecipitated proteins were glycosylated. A single protein of 46 kDa was immunoprecipitated from the cell-free translation products of mRNA obtained from the leukemia cells. Antiserum to the C but not to the N terminus of the predicted amino acid sequence of the transforming protein p28sis/PDGF-2 also immunoprecipitated proteins secreted by the HL-60 cells. These findings provide a direct demonstration for the synthesis and secretion of PDGF-like proteins by leukemia cells in culture. These proteins do not appear to be coded by the known c-sis/PDGF-2 locus since no sis mRNA was detectable in the HL-60 cells.
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