Differential effect of FGF and PDGF on cell proliferation and migration in osteoblastic cells

It has been known that growth factors such as fibroblast growth factor (FGF) and platelet-derived growth factor (PDGF) can promote proliferation and migration in a variety of cell types including osteoblastic cells. However, the mechanism underlying their action has not been clearly defined. The pre...

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Published in:Growth factors (Chur, Switzerland) Switzerland), 2007-01, Vol.25 (2), p.77-86
Main Authors: Kim, Su Jin, Kim, Su Yung, Kwon, Chae Hwa, Kim, Yong Keun
Format: Article
Language:English
Subjects:
Animals
Cell Cycle
Cell Line
Cell Movement
Cell Proliferation
Dose-Response Relationship, Drug
ERK
Extracellular Signal-Regulated MAP Kinases - metabolism
Fibroblast Growth Factors - physiology
Growth factor
Humans
Mice
migration
Models, Biological
osteoblastic cells
Osteoblasts - metabolism
Phosphorylation
PI3K/Akt
Platelet-Derived Growth Factor - metabolism
Platelet-Derived Growth Factor - physiology
proliferation
Retinoblastoma Protein - metabolism
Signal Transduction
src-Family Kinases - metabolism
Time Factors
Wound Healing
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Summary:It has been known that growth factors such as fibroblast growth factor (FGF) and platelet-derived growth factor (PDGF) can promote proliferation and migration in a variety of cell types including osteoblastic cells. However, the mechanism underlying their action has not been clearly defined. The present study was undertaken to examine the effect of FGF and PDGF on cell proliferation and migration and to determine the role of extracellular signal-regulated kinase (ERK) and Akt in action of FGF and PDGF in osteoblastic cells. FGF enhanced proliferation in a dose- and time-dependent manner, whereas it did not affect cell migration. FGF induced a transient activation of ERK, but not Akt, which was inhibited by an inhibitor of MEK, the upstream kinase of ERK, but not by inhibitors of PI3K/Akt (LY294002), epidermal growth factor receptor (EGFR, AG1478), and Src (PP2). FGF-induced proliferation was inhibited by inhibitors of MEK/ERK and Src pathways. Exposure of cells to FGF stimulated transition of cell cycle from the G1 phase to S phase and increased phosphorylation of Rb. FGF-induced phosphorylation of Rb was attenuated by inhibitors of MEK/ERK and Src pathways. Cell migration studies indicated that PDGF stimulated migration, but it had no effect on cell proliferation. PDGF induced activation of ERK and Akt. The ERK activatin was inhibited by the Src inhibitor and the Akt activation was inhibited by inhibitors of EGFR and Src. PDGF-induced migration was inhibited by inhibitors of MEK/ERK, PI3K/Akt, EGFR and Src pathways. Taken together, these findings suggest that the MEK/ERK and Src pathways play an important role in the FGF-induced proliferation and signaling pathways involving MEK/ERK, EGFR, Src and PI3K/Akt mediate the PDGF-induced migration. These data are of importance in understanding the roles of these growth factors in osteoblastic cell proliferation and migration.
ISSN:0897-7194
1029-2292
DOI:10.1080/08977190701398977