Foxo1, a novel regulator of osteoblast differentiation and skeletogenesis

Cristina Teixeira, Yuexun Liu, Lwin M. Thant, Jason Pang, Glyn Palmer, Mani Alikhani

Research output: Contribution to journalArticle

Abstract

Skeletogenesis depends on the activity of bone-forming cells derived from mesenchymal cells. The pathways that control mesenchymal cell differentiation are not well understood. We propose that Foxo1 is an early molecular regulator during mesenchymal cell differentiation into osteoblasts. In mouse embryos, Foxo1 expression is higher in skeletal tissues, while Foxo1 silencing has a drastic impact on skeletogenesis and craniofacial development, specially affecting pre-maxilla, nasal bone, mandible, tibia, and clavicle. Similarly, Foxo1 activity and expression increase in mouse mesenchymal cells under the influence of osteogenic stimulants. In addition, silencing Foxo1 blocks the expression of osteogenic markers such as Runx2, alkaline phosphatase, and osteocalcin and results in decreased culture calcification even in the presence of strong osteogenic stimulants. Conversely, the expression of these markers increases significantly in response to Foxo1 overexpression. One mechanism through which Foxo1 affects mesenchymal cell differentiation into osteoblasts is through regulation of a key osteogenic transcription factor, Runx2. Indeed, our results show that Foxo1 directly interacts with the promoter of Runx2 and regulates its expression. Using a tibia organ culture model, we confirmed that silencing Foxo1 decreases the expression of Runx2 and impairs bone formation. Furthermore, our data reveals that Runx2 and Foxo1 interact with each other and cooperate in the transcriptional regulation of osteoblast markers. In conclusion, our in vitro, ex vivo, and in vivo results strongly support the notion that Foxo1 is an early molecular regulator in the differentiation of mesenchymal cells into osteoblast.

Original languageEnglish (US)
Pages (from-to)31055-31065
Number of pages11
JournalJournal of Biological Chemistry
Volume285
Issue number40
DOIs
StatePublished - Oct 1 2010

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Osteoblasts
Cell Differentiation
Bone
Tibia
Cells
Nasal Bone
Clavicle
Organ Culture Techniques
Osteocalcin
Maxilla
Mandible
Osteogenesis
Alkaline Phosphatase
Transcription Factors
Embryonic Structures
Tissue
Bone and Bones

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology
  • Medicine(all)

Cite this

Foxo1, a novel regulator of osteoblast differentiation and skeletogenesis. / Teixeira, Cristina; Liu, Yuexun; Thant, Lwin M.; Pang, Jason; Palmer, Glyn; Alikhani, Mani.

In: Journal of Biological Chemistry, Vol. 285, No. 40, 01.10.2010, p. 31055-31065.

Research output: Contribution to journalArticle

Teixeira, Cristina ; Liu, Yuexun ; Thant, Lwin M. ; Pang, Jason ; Palmer, Glyn ; Alikhani, Mani. / Foxo1, a novel regulator of osteoblast differentiation and skeletogenesis. In: Journal of Biological Chemistry. 2010 ; Vol. 285, No. 40. pp. 31055-31065.
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