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Mol. Cell. Biol., 03 1995, 1244-1253, Vol 15, No. 3
Copyright © 1995, American Society for Microbiology

Repression of platelet-derived growth factor beta-receptor expression by mitogenic growth factors and transforming oncogenes in murine 3T3 fibroblasts

C Vaziri and DV Faller
Cancer Research Center, Boston University School of Medicine, Massachusetts 02118.

Platelet-derived growth factor BB (PDGF-BB) is an important extracellular factor for regulating the G0-S phase transition of murine BALB/c-3T3 fibroblasts. We have investigated the expression of the PDGF beta receptor (PDGF beta R) in these cells. We show that the state of growth arrest in G0, resulting from serum deprivation, is associated with increased expression of the PDGF beta R. When the growth-arrested fibroblasts are stimulated to reenter the cell cycle by the mitogenic action of serum or certain specific combinations of growth factors, PDGF beta R mRNA levels and cell surface PDGF-BB-binding sites are markedly downregualted. Oncogene-transformed 3T3 cell lines, which fail to undergo growth arrest following prolonged serum deprivation, express constitutively low levels of the PDGF beta R mRNA and possess greatly reduced numbers of cell surface PDGF receptors, as determined by PDGF- BB binding and Western blotting (immunoblotting). Nuclear runoff assays indicate the mechanism of repression of PDGF beta R expression to be, at least in large part, transcriptional. These data indicate that expression of the PDGF beta R is regulated in a growth state-dependent manner in fibroblasts and suggest that this may provide a means by which cells can modulate their responsiveness to the actions of PDGF.

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