title: Developmentally regulated production of platelet-derived growth factor-like molecules.
abstract: Platelet-derived growth factor (PDGF) is thought to mediate the proliferation of smooth muscle cells in injured arteries, and may be involved in the pathogenesis of atherosclerosis. PDGF-like molecules from non-platelet sources may also play a role in the regulation of cell activity in other circumstances. Transformation of cells by a wide range of oncongenic agents appears to activate a cellular gene encoding a PDGF-like molecule, possibly accounting for the ability of transformed cells to grow without addition of exogenous mitogens. We show here that a molecule (PDGF-c) which can compete with 125I-PDGF for binding to PDGF receptors is secreted by cultured rat aortic smooth muscle cells (rASMC) isolated from 13 to 18-day-old rats (pups) but not from three-month-old animals (adults). Thus, production of PDGF-c appears to be developmentally regulated and may be a factor in the more rapid proliferation of rASMC and synthesis of connective tissue components which occurs during growth of the aorta in vivo.
mesh_terms: D000375:Aging; D000818:Animals; D001011:Aorta / Q000254:growth & development* / Q000378:metabolism; D002478:Cells, Cultured; D007700:Kinetics; D024510:Muscle Development; D009131:Muscle, Smooth, Vascular / Q000254:growth & development* / Q000378:metabolism; D010982:Platelet-Derived Growth Factor / Q000096:biosynthesis*; D051381:Rats; D011918:Rats, Inbred SHR; D011919:Rats, Inbred Strains; D011921:Rats, Inbred WKY; D011956:Receptors, Cell Surface / Q000378:metabolism; D017479:Receptors, Platelet-Derived Growth Factor; D013045:Species Specificity
chemical_list: D010982:Platelet-Derived Growth Factor; D011956:Receptors, Cell Surface; D017479:Receptors, Platelet-Derived Growth Factor