Omentin-1 prevents inflammation-induced osteoporosis by downregulating the pro-inflammatory cytokines.

Abstract

Osteoporosis is a frequent complication of chronic inflammatory diseases and increases in the pro-inflammatory cytokines make an important contribution to bone loss by promoting bone resorption and impairing bone formation. Omentin-1 is a newly identified adipocytokine that has anti-inflammatory effects, but little is known about the role of omentin-1 in inflammatory osteoporosis. Here we generated global omentin-1 knockout (omentin-1-/-) mice and demonstrated that depletion of omentin-1 induces inflammatory bone loss-like phenotypes in mice, as defined by abnormally elevated pro-inflammatory cytokines, increased osteoclast formation and bone tissue destruction, as well as impaired osteogenic activities. Using an inflammatory cell model induced by tumor necrosis factor-α (TNF-α), we determined that recombinant omentin-1 reduces the production of pro-inflammatory factors in the TNF-α-activated macrophages, and suppresses their anti-osteoblastic and pro-osteoclastic abilities. In the magnesium silicate-induced inflammatory osteoporosis mouse model, the systemic administration of adenoviral-delivered omentin-1 significantly protects from osteoporotic bone loss and inflammation. Our study suggests that omentin-1 can be used as a promising therapeutic agent for the prevention or treatment of inflammatory bone diseases by downregulating the pro-inflammatory cytokines.

• Authors: Shan-Shan Rao, Yin Hu, Ping-Li Xie, Jia Cao, Zhen-Xing Wang, Jiang-Hua Liu, Hao Yin, Jie Huang, Yi-Juan Tan, Juan Luo, Ming-Jie Luo, Si-Yuan Tang, Tuan-Hui Chen, Ling-Qing Yuan, Er-Yuan Liao, Ran Xu, Zheng-Zhao Liu, Chun-Yuan Chen, Hui Xie
• Journal: Bone research (Bone Res) Vol. 6 Pg. 9 ( 2018) ISSN: 2095-4700 [Print] China
• PMID: 29619269 (Publication Type: Journal Article)