Human platelet-derived growth factor stimulates amino acid transport and protein synthesis by human diploid fibroblasts in plasma-free media - PubMed (original) (raw)
Human platelet-derived growth factor stimulates amino acid transport and protein synthesis by human diploid fibroblasts in plasma-free media
A J Owen 3rd et al. Proc Natl Acad Sci U S A. 1982 May.
Abstract
Purified human platelet-derived growth factor (PDGF) induces an increase in amino acid uptake via system A in quiescent human diploid fibroblasts. Cells must be exposed to PDGF for 45 min to obtain maximum transport stimulation. Transport stimulation requires protein synthesis. Transient exposure to PDGF, alone, in the absence of plasma components can stimulate transport. Acid-insoluble [3H]leucine incorporation is also stimulated by PDGF treatment, and this event also does not require the presence of plasma components. Finally, antiserum to PDGF that blocks PDGF-stimulated DNA synthesis in these cells also blocks PDGF-stimulated amino acid uptake and protein synthesis. Increased amino acid uptake and protein synthesis that occur soon after addition of fresh serum to quiescent cells can be attributed to the action of PDGF acting alone and should be useful as markers for the investigation of early cellular events caused by PDGF.
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