Sulfated glycosaminoglycans mediate the effects of FGF2 on the osteogenic potential of rat calvarial osteoprogenitor cells

Ling, L., Murali, S., Dombrowski, C., Haupt, Larisa M., Stein, G. S., van Wijnen, A. J., Nurcombe, V., & Cool, S. M. (2006) Sulfated glycosaminoglycans mediate the effects of FGF2 on the osteogenic potential of rat calvarial osteoprogenitor cells. Journal of Cellular Physiology, 209(3), pp. 811-825.

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Abstract

Fibroblast growth factor-2 (FGF2) is a powerful promoter of bone growth. We demonstrate here that brief exposure to FGF2 enhances mineralized nodule formation in cultured rat osteoprogenitor cells due to an expansion of cells that subsequently mineralize. This mitogenic effect is mediated via sulfated glycosaminoglycans (GAGs), FGFR1, and the extracellular signal-regulated kinase (ERK) pathway. The GAGs involved in this stimulation are chondroitin sulfates (CS) rather than heparan sulfates (HS). However, continuous FGF2 treatment reduces alkaline phosphatase (ALP) activity, downregulates collagen Ialpha1 (ColIalpha1) and FGFR3 expression, upregulates the expression and secretion of osteopontin (OPN) and inhibits mineralization. The inhibitory effects of FGF2 on FGFR3 expression and ALP activity are also mediated by the ERK pathway, although the effects of FGF2 on ColIalpha1 and OPN expression are mediated by GAGs and PKC activity. Thus short-term activation of FGF2/FGFR1 promotes osteoprogenitor proliferation and subsequent differentiation, while long-term activation of FGF2 signaling disrupts mineralization by modulating osteogenic marker expression. This study thus establishes the central role of sulfated GAGs in the osteogenic progression of osteoprogenitors.

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ID Code: 69474
Item Type: Journal Article
Refereed: Yes
Additional Information: Ling, Ling
Murali, Sadasivam
Dombrowski, Christian
Haupt, Larisa M
Stein, Gary S
van Wijnen, Andre J
Nurcombe, Victor
Cool, Simon M
eng
Research Support, Non-U.S. Gov't
2006/09/15 09:00
J Cell Physiol. 2006 Dec;209(3):811-25.
Additional URLs:
Keywords: Alkaline Phosphatase/metabolism, Animals, Calcification, Physiologic/physiology, Cell Proliferation, Cells, Cultured, Collagen Type I/metabolism, Enzyme Activation, Extracellular Signal-Regulated MAP Kinases/antagonists & inhibitors/metabolism, Fibroblast Growth Factor 2/genetics/*metabolism, *Glycosaminoglycans/chemistry/metabolism, Humans, Osteogenesis/*physiology, Osteopontin/metabolism, Rats, Rats, Wistar, Receptor, Fibroblast Growth Factor, Type 1/metabolism, Skull/*cytology, Stem Cells/cytology/*physiology, Sulfates/*chemistry
DOI: 10.1002/jcp.20760
ISSN: 1097-4652 (online) 0021-9541 (print)
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > BIOCHEMISTRY AND CELL BIOLOGY (060100) > Cell Development Proliferation and Death (060103)
Divisions: Current > Schools > School of Biomedical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2006 Wiley-Liss, Inc.
Deposited On: 07 Apr 2014 01:17
Last Modified: 07 Apr 2014 01:17

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