Fat and Bone: PGC-1α Regulates Mesenchymal Cell Fate during Aging and Osteoporosis

PGC-1α is a transcriptional co-activator associated with PPARγ that regulates thermogenic gene expression in brown fat. In this issue, Yu et al. (2018) show that PGC-1α regulates marrow mesenchymal stromal cell lineage allocation in vivo, inhibiting marrow adipogenesis and associated bone loss in the aging skeleton and following ovariectomy-induced osteoporosis.