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PLoS One. 2013;8(1):e54837. doi: 10.1371/journal.pone.0054837. Epub 2013 Jan 24.

Repression of osteoblast maturation by ERRα accounts for bone loss induced by estrogen deficiency.

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  • 1Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, Centre national de la recherche scientifique UMR5242, Ecole Normale Supérieure de Lyon, Lyon, France.

Abstract

ERRα is an orphan member of the nuclear receptor family, the complete inactivation of which confers resistance to bone loss induced by ageing and estrogen withdrawal to female mice in correlation with increased bone formation in vivo. Furthermore ERRα negatively regulates the commitment of mesenchymal cells to the osteoblast lineage ex vivo as well as later steps of osteoblast maturation. We searched to determine whether the activities of ERRα on osteoblast maturation are responsible for one or both types of in vivo induced bone loss. To this end we have generated conditional knock out mice in which the receptor is normally present during early osteoblast differentiation but inactivated upon osteoblast maturation. Bone ageing in these animals was similar to that observed for control animals. In contrast conditional ERRαKO mice were completely resistant to bone loss induced by ovariectomy. We conclude that the late (maturation), but not early (commitment), negative effects of ERRα on the osteoblast lineage contribute to the reduced bone mineral density observed upon estrogen deficiency.

PMID:
23359549
PMCID:
PMC3554601
DOI:
10.1371/journal.pone.0054837
[PubMed - indexed for MEDLINE]
Free PMC Article
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