title: Regulation of osteoblastogenesis and bone mass by Wnt10b.
abstract: Wnts comprise a family of secreted signaling proteins that regulate diverse developmental processes. Activation of Wnt signaling by Wnt10b inhibits differentiation of preadipocytes and blocks adipose tissue development; however, the effect of Wnt10b on other mesenchymal lineages has not been defined. To explore the physiological role of Wnt signaling in bone development, we analyzed FABP4-Wnt10b mice, which express the Wnt10b transgene in marrow. Femurs from FABP4-Wnt10b mice have almost four times as much bone in the distal metaphyses and are mechanically stronger. These mice maintain elevated bone mass at least through 23 months of age. In addition, FABP4-Wnt10b mice are protected from the bone loss characteristic of estrogen deficiency. We used pharmacological and genetic approaches to demonstrate that canonical Wnt signaling stimulates osteoblastogenesis and inhibits adipogenesis of bipotential mesenchymal precursors. Wnt10b shifts cell fate toward the osteoblast lineage by induction of the osteoblastogenic transcription factors Runx2, Dlx5, and osterix and suppression of the adipogenic transcription factors C/EBPalpha and PPARgamma. One mechanism whereby Wnt10b promotes osteoblastogenesis is suppression of PPARgamma expression. Finally, Wnt10b-/- mice have decreased trabecular bone and serum osteocalcin, confirming that Wnt10b is an endogenous regulator of bone formation.
authors.affiliation: Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109-0622, USA.
authors.forename: Christina N
authors.initials: CN
authors.lastname: Bennett
authors.forename: Kenneth A
authors.initials: KA
authors.lastname: Longo
authors.forename: Wendy S
authors.initials: WS
authors.lastname: Wright
authors.forename: Larry J
authors.initials: LJ
authors.lastname: Suva
authors.forename: Timothy F
authors.initials: TF
authors.lastname: Lane
authors.forename: Kurt D
authors.initials: KD
authors.lastname: Hankenson
authors.forename: Ormond A
authors.initials: OA
authors.lastname: MacDougald
mesh_terms: D000375:Aging / Q000502:physiology; D000818:Animals; D015519:Bone Density / Q000502:physiology*; D002455:Cell Division / Q000502:physiology*; D005260:Female; D051379:Mice; D018345:Mice, Knockout; D010006:Osteoblasts / Q000166:cytology*; D010052:Ovariectomy; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000502:physiology*; D051153:Wnt Proteins
chemical_list: D011518:Proto-Oncogene Proteins; D051153:Wnt Proteins; C102068:Wnt10b protein, mouse
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