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Title: NRF2 function in osteocytes is required for bone homeostasis and drives osteocytic gene expression
Author: Sánchez de Diego, Cristina
Pedrazza, Leonardo
Pimenta-Lopes, Carolina
Martinez-Martinez, Arturo
Dahdah, Norma
Valer, José Antonio
García-Roves, Pablo M. (Pablo Miguel)
Rosa López, José Luis
Ventura Pujol, Francesc
Keywords: Ossos
Issue Date: 1-Apr-2021
Publisher: Elsevier B.V.
Abstract: Osteocytes, the most abundant bone cell type, are derived from osteoblasts through a process in which they are embedded in an osteoid. We previously showed that nutrient restriction promotes the osteocyte transcriptional program and is associated with increased mitochondrial biogenesis. Here, we show that increased mitochondrial biogenesis increase reactive oxygen species (ROS) levels and consequently, NRF2 activity during osteocytogenesis. NRF2 activity promotes osteocyte-specific expression of Dmp1, Mepe, and Sost in IDG-SW3 cells, primary osteocytes, and osteoblasts, and in murine models with Nfe2l2 deficiency in osteocytes or osteoblasts. Moreover, ablation of Nfe2l2 in osteocytes or osteoblasts generates osteopenia and increases osteoclast numbers with marked sexual dimorphism. Finally, treatment with dimethyl fumarate prevented the deleterious effects of ovariectomy in trabecular bone masses of mice and restored osteocytic gene expression. Altogether, we uncovered the role of NRF2 activity in osteocytes during the regulation of osteocyte gene expression and maintenance of bone homeostasis.
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It is part of: Redox Biology, 2021, vol. 40, p. 101845
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ISSN: 2213-2317
Appears in Collections:Articles publicats en revistes (Ciències Fisiològiques)
Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))

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