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. 2003 Jun 6;278(23):21258-66.
doi: 10.1074/jbc.M302113200. Epub 2003 Mar 28.

Impaired osteoclast formation in bone marrow cultures of Fgf2 null mice in response to parathyroid hormone

Yosuke Okada  1 , Aldemar Montero, Xuxia Zhang, Takanori Sobue, Joseph Lorenzo, Thomas Doetschman, J Douglas Coffin, Marja M Hurley
Affiliations
Free article

Impaired osteoclast formation in bone marrow cultures of Fgf2 null mice in response to parathyroid hormone

Yosuke Okada et al. J Biol Chem. .
Free article

Abstract

Fibroblast growth factor (FGF)-2 and parathyroid hormone (PTH) are potent inducers of osteoclast (OCL) formation, and PTH increases FGF-2 mRNA and protein expression in osteoblasts. To elucidate the role of endogenous FGF-2 in PTH responses, we examined PTH-induced OCL formation in bone marrow cultures from wild type and mice with a disruption of the Fgf2 gene. FGF-2-induced OCL formation was similar in marrow culture from both genotypes. In contrast, PTH-stimulated OCL formation in bone marrow cultures or co-cultures of osteoblast-spleen cells from Fgf2-/mice was significantly impaired. PTH increased RANKL mRNA expression in osteoblasts cultures from both genotypes. After 6 days of treatment, osteoprotegerin protein in cell supernatants was 40-fold higher in vehicle-treated and 30-fold higher in PTH-treated co-cultures of osteoblast and spleen cells from Fgf2-/mice compared with Fgf2+/+ mice. However, a neutralizing antibody to osteoprotegerin did not rescue reduced OCL formation in response to PTH. Injection of PTH caused hypercalcemia in Fgf2+/+ but not Fgf2-/mice. We conclude that PTH stimulates OCL formation and bone resorption in mice in part by endogenous FGF-2 synthesis by osteoblasts. Because RANKL- and interleukin-11-induced OCL formation was also reduced in bone marrow cultures from Fgf2-/mice, we further conclude that endogenous FGF-2 is necessary for maximal OCL formation by multiple bone resorbing factors.

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