Bone Cell Biology and Vitamin D Metabolism
Summary
Bone is a dynamic tissue maintained by the coordinated activity of osteoblasts, osteoclasts and osteocytes. Osteoblasts synthesise collagen-rich extracellular matrix and regulate its mineralisation, while osteoclasts resorb mineralised matrix under the control of signals such as RANKL. Osteocytes, embedded within the matrix, act as mechanosensors and orchestrators of local remodelling. Vitamin D, synthesised in the skin and activated in the liver and kidney to 1,25-dihydroxyvitamin D₃, binds a nuclear receptor in bone cells to regulate gene expression. This hormone controls calcium and phosphate homeostasis, promotes osteoblast differentiation and matrix maturation, and indirectly influences osteoclastogenesis through modulation of RANKL and osteoprotegerin levels. Together, these pathways ensure skeletal integrity, adaptive remodelling in response to mechanical load and maintenance of mineral balance. Understanding the interplay between vitamin D signalling and bone-cell function is essential for addressing disorders such as osteoporosis, rickets and fracture healing worldwide.
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Bone Cell Biology and Vitamin D Metabolism publication trend
The graph below shows the total number of articles in bone cell biology and vitamin d metabolism across all publications each year (not limited to Nature Index journals).
Technical terms
Osteoblast: A bone-forming cell responsible for matrix synthesis and mineralisation.
Osteoclast: A multinucleated cell that mediates bone resorption during remodelling.
Osteocyte: A mature bone cell embedded in matrix, acting as a mechanosensor and regulator of remodelling.
1,25-Dihydroxyvitamin D₃: The hormonally active form of vitamin D that binds the vitamin D receptor to regulate gene expression.
RANKL: A cytokine produced by osteoblast-lineage cells that promotes osteoclast differentiation and activation.
Mineralisation: The process by which osteoblasts deposit hydroxyapatite crystals within the organic matrix.
References
- Vitamin D3 Metabolites Modulate Dihydropyridine-sensitive Calcium Currents in Clonal Rat Osteosarcoma Cells*. Journal of Biological Chemistry (1989).
- Regulation of type I collagen synthesis by 1,25-dihydroxyvitamin D3 in human osteosarcoma cells.. Journal of Biological Chemistry (1988).
- 1,25-Dihydroxyvitamin D3 stimulates the alkaline phosphatase activity of osteoblast-like cells.. Journal of Biological Chemistry (1981).
- The effect of 1,25(OH)2D3 on alkaline phosphatase in osteoblastic osteosarcoma cells.. Journal of Biological Chemistry (1982).
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