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Mechanisms of calcium disposal from osteoclastic resorption hemivacuole

Lookup NU author(s): Dr Harish Datta, Dr Ben Horrocks

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Abstract

One of the most remarkable but neglected aspects of osteoclast function is its unique adaptation that allows the cell to function despite its resorbing surface being exposed to extremely high levels of ambient Ca2+. Recently our studies have provided evidence of continuous transcellular Ca2+ disposal, suggesting that osteoclasts are able to prevent Ca2+ accumulation within the resorptive hemivacuole. It has also been shown that matrix protein degradation products that accumulate within the osteoclast resorptive vacuole are also undergoing transcellular transport by transcytosis. However, both experimental evidence and theoretical considerations suggest that transcellular transport of Ca2+ and matrix protein is likely to occur via distinct routes. In light of these considerations, we are able to provide convincing explanations for the apparent anomalies of osteoclast intracellular [Ca2+] responses to a variety of endocrine stimuli. The understanding of the mechanisms involved in Ca2+ handling by osteoclasts indicates the lack of a simple link between osteoclast function and changes in overall cytosolic [Ca2+].


Publication metadata

Author(s): Datta HK, Horrocks BR

Publication type: Article

Publication status: Published

Journal: Journal of Endocrinology

Year: 2003

Volume: 176

Issue: 1

Pages: 1-5

ISSN (print): 0022-0795

ISSN (electronic): 1479-6805

Publisher: BioScientifica Ltd.

URL: http://dx.doi.org/10.1677/joe.0.1760001

DOI: 10.1677/joe.0.1760001

PubMed id: 12525243


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