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Expression of fibroblast growth factor receptor 3 by fibroblast growth factor 2 in cultured chick embryo chondrocytes



Expression of fibroblast growth factor receptor 3 by fibroblast growth factor 2 in cultured chick embryo chondrocytes



Cell Biology International 29(3): 203-212



Although fibroblast growth factor 2 (FGF2) and fibroblast growth factor receptor 3 (FGFR3) both inhibit longitudinal bone growth, little is known about the relationship between FGF2 and FGFR3. Accordingly, the current study examined the expression of FGFR3 mRNA after the administration of FGF2 using cultured chondrocytes from day 17 chick embryos to evaluate the relationship between FGF2 and FGFR3. The chondrocytes were isolated from the caudal one-third portion (LS) of sterna, peripheral regions (USP) and central core regions (USC) of the cephalic portion of the sterna, and lower portion of the proximal tibial growth plate (Ti) of day 17 chick embryo. The expression of FGFR1, FGFR3, and type II and X collagen mRNA in the chondrocytes from the LS, USP, USC, and Ti was determined. FGFR1 was not expressed in the LS and USP chondrocytes, yet strongly expressed in the USC and Ti chondrocytes. With a treatment of FGF2, the expression of FGFR1 slightly increased in the USC chondrocytes and was not related with the concentration of FGF2 in the Ti chondrocytes. FGFR3 was expressed in all the chondrocyte types, yet strongly increased in the LS, USC, USP, and Ti in that order according to the concentration of FGF2. For the LS and USP chondrocytes, the expression of FGFR3 with FGF2 increased in a 4-day culture, yet decreased in a 6-day culture, whereas for the USC chondrocytes, the expression of FGFR3 mRNA with FGF2 increased in a 2-day culture, yet decreased in a 4-day culture, suggesting that the hypertrophic chondrocytes were more numerous and sensitive compared to the proliferative chondrocytes. For all the chondrocyte types, FGF2 appeared to be up-regulated to FGFR3, as the expression of FGFR3 mRNA increased with a higher concentration of FGF2 until a peak level. In conclusion, FGF2 was found to up-regulate to FGFR3 until the peak level of FGFR3 mRNA expression, while in hypertrophic chondrocytes, FGFR3 appeared to cause the differentiaton of chondrocytes, resulting in the inhibition of longitudinal bone growth after the peak level of FGFR3 mRNA expression.

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Accession: 012074569

Download citation: RISBibTeXText

PMID: 15878293

DOI: 10.1016/j.cellbi.2004.09.015


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