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. 1991 Sep;2(9):719–726. doi: 10.1091/mbc.2.9.719

Basic fibroblast growth factor requires a long-lasting activation of protein kinase C to induce cell proliferation in transformed fetal bovine aortic endothelial cells.

M Presta 1, L Tiberio 1, M Rusnati 1, P Dell'Era 1, G Ragnotti 1
PMCID: PMC361866  PMID: 1742342

Abstract

Basic fibroblast growth factor (bFGF) induces a protein kinase C (PKC)-dependent mitogenic response in transformed fetal bovine aortic endothelial GM 7373 cells. A long-lasting interaction of bFGF with the cell is required to induce cell proliferation. bFGF-treated cells are in fact committed to proliferate only after they have entered the phase S of the cell cycle, 12-14 h after the beginning of bFGF treatment. Before that time, the mitogenic response to bFGF is abolished by 1) removal of extracellular bFGF by suramin, 2) addition of neutralizing anti-bFGF antibodies to the culture medium, 3) inhibition of PKC activity by the protein kinase inhibitor H-7, and 4) down-regulation of PKC by cotreatment with phorbol ester. Thus the requirement for a prolonged interaction of bFGF with the cell reflects the requirement for a prolonged activation of PKC. Similar conclusions can be drawn for the PKC activators 12-O-tetradecanoyl phorbol 13-acetate and 1,2-dioctanoyl-sn-glycerol. The two molecules require 16 and 6 h, respectively, of activation of PKC to induce 50% of maximal cell proliferation. The requirement for a long-lasting activation of PKC appears to be a mechanism for the control of cell proliferation capable of discriminating among transient nonmitogenic stimuli and long-lasting mitogenic stimuli.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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