Brain regulates weight bearing bone through PGE2 skeletal interoception: implication of ankle osteoarthritis and pain  

作　　者：Feng Gao Qimiao Hu Wenwei Chen Jilong Li Cheng Qi Yiwen Yan Cheng Qian Mei Wan James Ficke Junying Zheng Xu Cao 

机构地区：[1]Department of Orthopedic Surgery,Johns Hopkins University School of Medicine,Baltimore,Maryland 21205,USA [2]Department of Biomedical Engineering,Johns Hopkins University School of Medicine,Baltimore,Maryland 21205,USA

出　　处：《Bone Research》2024年第1期107-121,共15页骨研究（英文版）

基　　金：This research was supported by NIH National Institute on Aging under Award Number R01 AG076783,R01 AG068997 and P01 AG066603(to X.C.).

摘　　要：Bone is a mechanosensitive tissue and undergoes constant remodeling to adapt to the mechanical loading environment.However,it is unclear whether the signals of bone cells in response to mechanical stress are processed and interpreted in the brain.In this study,we found that the hypothalamus of the brain regulates bone remodeling and structure by perceiving bone prostaglandin E2(PGE2)concentration in response to mechanical loading.Bone PGE2 levels are in proportion to their weight bearing.When weight bearing changes in the tail-suspension mice,the PGE2 concentrations in bones change in line with their weight bearing changes.Deletion of cyclooxygenase-2(COX2)in the osteoblast lineage cells or knockout of receptor 4(EP4)in sensory nerve blunts bone formation in response to mechanical loading.Moreover,knockout of TrkA in sensory nerve also significantly reduces mechanical load-induced bone formation.Moreover,mechanical loading induces cAMP-response element binding protein(CREB)phosphorylation in the hypothalamic arcuate nucleus(ARC)to inhibit sympathetic tyrosine hydroxylase(TH)expression in the paraventricular nucleus(PVN)for osteogenesis.Finally,we show that elevated PGE2 is associated with ankle osteoarthritis(AOA)and pain.Together,our data demonstrate that in response to mechanical loading,skeletal interoception occurs in the form of hypothalamic processing of PGE2-driven peripheral signaling to maintain physiologic bone homeostasis,while chronically elevated PGE2 can be sensed as pain during AOA and implication of potential treatment.

关 键 词：PAIN ELEVATED PGE2 

分 类 号：R684.3[医药卫生—骨科学]