The role of the neuro-immune-bone axis in osteoporosis: from bone remodeling imbalance to multi-system interactions
Abstract
Osteoporosis is a systemic metabolic bone disease characterized by decreased bone mass, destruction of bone microstructure, and increased risk of fractures. Traditional views mainly attribute it to an imbalance between osteoblast-mediated bone formation and osteoclast-mediated bone resorption, but increasing evidence suggests that the pathogenesis and progression of osteoporosis are also regulated by complex interactions among the nervous system, immune system, and skeletal system. The neuro-immune-bone axis provides an important framework for integrating the bidirectional regulation between innervation, immune microenvironment, and bone remodeling process. This article systematically reviews the basis of interactions among sensory nerves, sympathetic nerves, immune cells, and bone cells in bone homeostasis, with a focus on the roles of sympathetic nerve activation, sensory neuropeptide imbalance, and immune inflammatory remodeling in the progression of osteoporosis. Furthermore, this article compares the differential imbalance patterns of this axis in postmenopausal osteoporosis, age-related osteoporosis, and secondary osteoporosis, and accordingly discusses its potential significance for disease classification and risk identification. At the therapeutic level, this article further distinguishes between clinically well-established management strategies and mechanistic interventions still in the exploratory stage. The former includes guideline-recommended anti-osteoporosis…
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