Calcified Tissue International

, Volume 34, Issue 1, pp 285–290 | Cite as

Bone acid phosphatase: Tartrate-resistant acid phosphatase as a marker of osteoclast function

  • Cedric Minkin
Laboratory Investigations


Organ cultures of newborn mouse calvaria were used to test the hypothesis that tartrate-resistant acid phosphatase might serve as a biochemical marker for osteoclast function. When bone resorption was stimulatedin vitro with either parathyroid hormone or 1,25(OH)2D3, there was a significant increase in both tartrate-resistant and tartrate-sensitive acid phosphatase activity in the medium relative to cultured controls. Tartrate-resistant activity was localized histochemically primarily over the osteoclast and appeared as three distinct activity bands when electrophoresed on polyacrylamide gels. The tartrate-sensitive activity was found primarily associated with bone cells other than the osteoclast using histochemical techniques, and was resolved into five bands on polyacrylamide gels. The results obtained from biochemical assays, histochemical observations, and polyacrylamide gel electrophoresis suggest that bone resorptionin vitro results in the release of tartrate-resistant acid phosphatase from osteoclasts and tartrate-sensitive acid phosphatase from other bone cells as well as osteoclasts. Tartrate-resistant acid phosphatases of bone may be suitable biochemical probes for osteoclast function, but it will be necessary to achieve further purification in order to develop analytical methods with sufficient sensitivity and specificity (e.g., immunochemical) to ensure precise localization and quantitation.

Key words

Acid phosphatase, tartrate-resistant Isoenzymes Bone resorption Osteoclast 


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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Cedric Minkin
    • 1
  1. 1.Department of Basic SciencesUniversity of Southern California School of DentistryLos AngelesUSA

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