外泌体介导的细胞间通信:基于"肾主骨"理论探讨绝经后骨质疏松症与膝骨关节炎的共病机制OA

Postmenopausal osteoporosis(PMOP)and knee osteoarthritis(KOA)are common degenerative disorders in elderly women and have long been regarded as disease entities with relatively independent pathophysiological mechanisms.However,epidemiological studies have revealed a pronounced pattern of comorbidity between PMOP and KOA in postm-enopausal women,suggesting shared pathological substrates and systemic regulatory networks.According to the tradition-al Chinese medicine(TCM)theory of the"kidney governing bone",deficiency of kidney essence is considered the fundamental cause of the concurrent decline of bone and joint systems,while modern studies have shown that exosome-mediated intercellular communication plays a pivotal role in bone-cartilage coupling and systemic metabolic regulation.Based on the"kidney governing bone"theory,this paper systematically elucidates its correspondence with modern biology,including the mapping relationships between kidney essence and endocrine homeostasis,stem cell biology,redox balance,and mitochondrial energy metabolism,and proposes that exosomes act as a microscopic carriers for the transmission of"kidney essence"-related information,whose miRNA signatures may serve as systemic molecular biomarkers of PMOP-KOA comorbidity.By mediating cross-tissue signal transfer,exosomes construct a dynamic informational"bone-cartilage axis"and thereby realize the long-range regulatory function implied in the"kidney governing bone".Under kidney-deficiency conditions,the exosomal secretion profiles of bone marrow mesenchymal stem cells(BMSCs),osteoclasts,chondrocytes,and adipocytes undergo pathological repro-gramming,driving an imbalance between osteogenesis and bone resorption as well as between anabolic and catabolic processes,which in turn promotes the coordinated progression of bone loss and cartilage degeneration,while at the same time providing a potential molecular basis for early screening,risk stratification,and TCM pattern differentiation in PMOP-KOA comorbidity.In summary,dysregulated exosome-mediated intercellular communication represents a key molecular basis for the comorbidity of PMOP and KO A,strongly corroborating the traditional theory of the"kidney gov-erning bone and nourishing marrow to connect the collaterals",and offering a novel theoretical framework and intervention perspective for the development of exosome-centered pro-osteogenic and chondroprotective strategies and integrated TCM-Western medicine therapeutic pathways.