Gap Junctional Communication in Bone Physiology
Summary
Gap junctions are specialised intercellular channels formed by connexin proteins that permit direct exchange of ions, metabolites and signalling molecules between adjacent bone cells. In the skeleton, connexin43 (Cx43) is the predominant connexin expressed by osteoblasts, osteocytes and osteoclasts. Through extensive dendritic processes, osteocytes establish a functional syncytium that rapidly transduces mechanical forces into biochemical signals, orchestrating bone formation and resorption. Mechanosensitive opening of Cx43-containing channels facilitates release of prostaglandin E₂ and calcium waves, which in turn regulate the activity of surface osteoblasts and osteoclasts. Coordination of these events underpins skeletal adaptation to mechanical loading, maintenance of mineral homeostasis and repair of microdamage. Disruption of gap junctional communication—whether by ageing, disuse or genetic alteration of connexin expression—leads to impaired mechanotransduction, increased osteocyte apoptosis and imbalanced osteoclastogenesis, contributing to bone fragility. Elucidation of the complex interplay between connexin-based channels, haemichannels and downstream signalling pathways has revealed novel therapeutic targets for osteoporosis, fracture healing and implant integration.
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Gap Junctional Communication in Bone Physiology publication trend
The graph below shows the total number of articles in gap junctional communication in bone physiology across all publications each year (not limited to Nature Index journals).
Technical terms
Connexins: A family of transmembrane proteins that oligomerise to form channels for direct cytoplasmic exchange between adjacent cells.
Gap junctions: Intercellular channels composed of two aligned connexon hemichannels, permitting passage of ions and small signalling molecules.
Hemichannels: Undocked connexon assemblies on the cell surface that open to release or uptake signalling mediators such as prostaglandins.
Osteocytes: Mature bone cells embedded within the mineral matrix, acting as mechanosensors and central regulators of bone remodelling.
Mechanotransduction: The process by which mechanical stimuli are converted into biochemical signals to regulate cellular functions.
References
- Activation of connexin hemichannels enhances mechanosensitivity and anabolism in disused and aged bone. JCI Insight (2024).
- Titanium nanotopography enhances mechano-response of osteocyte three-dimensional network toward osteoblast activation. Biomaterials Advances (2024).
- Functional Roles of Connexins and Gap Junctions in Osteo-Chondral Cellular Components. International Journal of Molecular Sciences (2023).
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