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The Histochemical Journal

, Volume 20, Issue 5, pp 269–275 | Cite as

A quantitative cytochemical assay for osteoclast acid phosphatase activity in foetal rat calvaria

  • D. M. Webber
  • I. P. Braidman
  • W. R. Robertson
  • D. C. Anderson
Papers

Summary

Acid phosphatase activity is prominent in osteoclasts (bone resorbing cells) and has been implicated in the process of bone resorption, although its precise role is not understood. To study the distribution and activity of this enzyme, a quantitative cytochemical method has been developed using undecalcified fresh frozen sections of foetal rat calvariae. Sections were allowed to react with 3mm naphthol ASBI phosphate at pH 5.0, and the reaction was stopped by rinsing in ice-cold tap water containing 50mm sodium fluoride. The reaction product was post-coupled to Fast Garnet at 4°C. The absorbance of areas of reaction product in the cytoplasm was measured using scanning and integrating microdensitometry. The initial velocity rate was maintained for up to 2 min at pH 5.0 with a substrate concentration of 3mm and a section thickness of 5 µm. Under these conditions reaction product was localized to osteoclasts and the surface of bone matrix beneath these cells. Activities in osteoblasts and chondrocytes were negligible. Osteoclastic acid phosphatase was almost totally inhibited by 10mm fluoride and reduced by 70% by 100mm tartrate.

Keywords

Acid Phosphatase Tartrate Naphthol Acid Phosphatase Activity Sodium Fluoride 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd 1988

Authors and Affiliations

  • D. M. Webber
    • 1
  • I. P. Braidman
    • 1
  • W. R. Robertson
    • 2
  • D. C. Anderson
    • 1
  1. 1.Department of MedicineHope Hospital, University of Manchester School of MedicineSalfordUK
  2. 2.Department of Chemical PathologyHope Hospital, University of Manchester School of MedicineSalfordUK

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