1. PPARδ-mediated mitochondrial rewiring of osteoblasts determines bone mass.
- Author
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Müller DIH, Stoll C, Palumbo-Zerr K, Böhm C, Krishnacoumar B, Ipseiz N, Taubmann J, Zimmermann M, Böttcher M, Mougiakakos D, Tuckermann J, Djouad F, Schett G, Scholtysek C, and Krönke G
- Subjects
- Animals, Bone Density physiology, Cell Differentiation, Cells, Cultured, Energy Metabolism genetics, Energy Metabolism physiology, Mesenchymal Stem Cells cytology, Mice, Mice, Knockout, Mitochondria metabolism, Osteoblasts cytology, Osteoclasts metabolism, Oxidative Phosphorylation, Bone Remodeling physiology, Osteoblasts metabolism, Osteogenesis physiology, PPAR delta genetics, PPAR delta metabolism
- Abstract
Bone turnover, which is determined by osteoclast-mediated bone resorption and osteoblast-mediated bone formation, represents a highly energy consuming process. The metabolic requirements of osteoblast differentiation and mineralization, both essential for regular bone formation, however, remain incompletely understood. Here we identify the nuclear receptor peroxisome proliferator-activated receptor (PPAR) δ as key regulator of osteoblast metabolism. Induction of PPARδ was essential for the metabolic adaption and increased rate in mitochondrial respiration necessary for the differentiation and mineralization of osteoblasts. Osteoblast-specific deletion of PPARδ in mice, in turn, resulted in an altered energy homeostasis of osteoblasts, impaired mineralization and reduced bone mass. These data show that PPARδ acts as key regulator of osteoblast metabolism and highlight the relevance of cellular metabolic rewiring during osteoblast-mediated bone formation and bone-turnover.
- Published
- 2020
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