Article: Bae, S; Lee, MJ; Mun, SH; Giannopoulou, EG; Yong-Gonzalez, V; Cross, JR; Murata, K; Giguere, V; van der Meulen, M; Park-Min, KH; “MYC-dependent Oxidative Metabolism Regulates Osteoclastogenesis via Nuclear Receptor ERR Alpha”, Journal of Clinical Investigation, 127 (7):2555-2568
Abstract: Osteoporosis is a metabolic bone disorder associated with compromised bone strength and an increased risk of fracture. Inhibition of the differentiation of bone-resorbing osteoclasts is an effective strategy for the treatment of osteoporosis. Prior work by our laboratory and others has shown that MYC promotes osteoclastogenesis in vitro, but the underlying mechanisms are not well understood. In addition, the in vivo importance of osteoclast-expressed MYC in physiological and pathological bone loss is not known. Here, we have demonstrated that deletion of Myc in osteoclasts increases bone mass and protects mice from ovariectomy-induced (OVX-induced) osteoporosis. Transcriptomic analysis revealed that MYC drives metabolic reprogramming during osteoclast differentiation and functions as a metabolic switch to an oxidative state. We identified a role for MYC action in the transcriptional induction of estrogen receptor-related receptor alpha (ERR alpha), a nuclear receptor that cooperates with the transcription factor nuclear factor of activated T cells, c1 (NFATc1) to drive osteoclastogenesis.
Accordingly, pharmacological inhibition of ERRa attenuated OVX-induced bone loss in mice. Our findings highlight a MYC/ERR alpha pathway that contributes to physiological and pathological bone loss by integrating the MYC/ERR alpha axis to drive metabolic reprogramming during osteoclast differentiation.
Funding Acknowledgement: National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), NIH [R00AR061430, R01AR069562]
Funding Text: We thank Lionel B. Ivashkiv, Steven Goldring (Hospital for Special Surgery, New York, NY), Matthew B. Greenblatt (Weill Cornell Medical College, New York, NY) for helpful discussions and critical review of the manuscript and Jae-Hyuck Shim and Yeon Suk Yang (University of Massachusetts Medical School) for micro-CT analysis and helpful discussions. This study was supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), NIH (R00AR061430 and R01AR069562). The contents of this manuscript are solely the responsibility of the authors and do not necessarily represent the official views of the NIH.