Repression of osteoblast maturation by ERR alpha accounts for bone loss induced by estrogen deficiency
2013
Gallet, Marlène | Saïdi, Soraya | Hay, Eric | Photsavang, Johann | Marty, Caroline | Sailland, Juliette | Carnesecchi, Julie | Tribollet, Violaine | Barenton, Bruno | Forcet, Christelle | Birling, Marie-Christine | Sorg, Tania | Chassande, Olivier | Cohen-Solal, M., - | Vanacker, Jean-Marc | Institut de Génomique Fonctionnelle de Lyon (IGFL) ; École normale supérieure de Lyon (ENS de Lyon) ; Université de Lyon-Université de Lyon-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Centre National de la Recherche Scientifique (CNRS) | Os et articulations ; Université Paris Diderot - Paris 7 (UPD7)-Institut National de la Santé et de la Recherche Médicale (INSERM) | U1026 ; Institut National de la Santé et de la Recherche Médicale (INSERM) | Institut Clinique de la Souris (ICS) ; Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS) | ANR-10-INBS-0007,PHENOMIN,INFRASTRUCTURE NATIONALE EN PHENOGENOMIQUE SOURIS(2010)
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Mostrar más [+] Menos [-]Inglés. 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.
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