Tartrate-Resistant Acid Phosphatase in Bone Biology
Summary
Tartrate-resistant acid phosphatase (TRAP) is a binuclear metallophosphatase predominantly expressed in osteoclasts, the bone-resorbing cells of the skeleton. As a marker of osteoclastic activity, TRAP has long been used in both clinical and experimental settings to gauge bone turnover. Beyond its diagnostic value, TRAP participates directly in the dephosphorylation of key matrix proteins and regulators of mineralisation. By cleaving phosphate groups from substrates such as osteopontin and inorganic pyrophosphate, TRAP modulates hydroxyapatite crystal growth and the adhesion of osteoclasts to the bone surface, thus orchestrating the resorption-coupled formation process of bone remodelling. Recent evidence has also traced TRAP expression to osteoblasts and osteocytes localised to secretory lysosomes, pointing to a wider role in cell signalling and the regulation of osteoclastogenesis. The enzymatic activity of TRAP is controlled by redox state and limited proteolysis, ensuring context-dependent activation within resorption lacunae. Aberrant TRAP function is implicated in pathologies ranging from osteoporosis to osteopetrosis, making it a potential therapeutic target for disorders of bone remodelling and mineral metabolism.
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Tartrate-Resistant Acid Phosphatase in Bone Biology publication trend
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Technical terms
Tartrate-resistant acid phosphatase (TRAP): A metallophosphatase enzyme expressed by osteoclasts, involved in bone matrix dephosphorylation and resorption.
Osteoclast: A specialised multinucleated cell responsible for bone resorption through acidification and enzymatic degradation of mineralised matrix.
Osteoblast: A bone-forming cell that synthesises collagen and matrix proteins and regulates mineralisation.
Osteocyte: A mature bone cell embedded within mineralised matrix, acting as a mechanosensor and regulator of remodelling.
Osteopontin: A phosphorylated extracellular matrix protein that inhibits hydroxyapatite crystal growth and mediates cell–matrix adhesion.
Receptor activator of nuclear factor κB ligand (RANKL): A cytokine produced by osteoblast-lineage cells that drives osteoclast differentiation and activation.
Osteoprotegerin (OPG): A decoy receptor for RANKL that inhibits osteoclastogenesis by preventing RANKL from binding its receptor on osteoclast precursors.
References
- Bone Alkaline Phosphatase and Tartrate-Resistant Acid Phosphatase: Potential Co-regulators of Bone Mineralization. Calcified Tissue International (2017).
- Dephosphorylation of osteopontin and bone sialoprotein by osteoclastic tartrate-resistant acid phosphatase. Modulation of osteoclast adhesion in vitro.. Journal of Biological Chemistry (1994).
- Tartrate-resistant acid phosphatase (TRAP) co-localizes with receptor activator of NF-KB ligand (RANKL) and osteoprotegerin (OPG) in lysosomal-associated membrane protein 1 (LAMP1)-positive vesicles in rat osteoblasts and osteocytes. Histochemistry and Cell Biology (2014).
- Intracellular Fragmentation of Bone Resorption Products by Reactive Oxygen Species Generated by Osteoclastic Tartrate-resistant Acid Phosphatase*. Journal of Biological Chemistry (1999).
- Proteolytic Excision of a Repressive Loop Domain in Tartrate-resistant Acid Phosphatase by Cathepsin K in Osteoclasts*. Journal of Biological Chemistry (2005).
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