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Demonstration of tartrate-resistant acid phosphatase in un-decalcified, glycolmethacrylate-embedded mouse bone: a possible marker for (pre)osteoclast identification
FP van de Wijngaert and EH Burger
Fixed, undecalcified mouse long bones were embedded in glycol methacrylate (GMA), sectioned, and incubated for acid phosphatase in the presence or absence of tartrate, to investigate the feasibility of tartrate-resistant acid phosphatase as a histochemical marker for osteoclast identification. Naphthol AS-BI phosphate was used as the substrate and hexazonium pararosanaline as coupler. Cytocentrifuge preparations of mouse, rat, and quail bone marrow or frozen and GMA sections of mouse splenic tissue were used as controls to specify acid phosphatase activity. After adequate fixation, acid phosphatase activity sensitive to tartrate inhibition (TS-AP) was demonstrated in macrophages from spleen, bone marrow, and loose connective tissue surrounding bone rudiments. Acid phosphatase activity resistant to tartrate inhibition (TR-AP), was detected in multi-nuclear osteoclasts and in some mononuclear cells from bone marrow and periosteum. In cytocentrifuge preparations and frozen sections of mouse spleen, TR-AP was demonstrated after simultaneous incubation with substrate and tartrate. In GMA sections, however, TR-AP could only be demonstrated after pre-incubation with tartrate before application of substrate. We suggest that histochemical demonstration of TR-AP versus TS-AP on GMA- embedded bone sections by means of a pre-incubation method can be used as an identification marker of (pre)osteoclasts. Plastic embedding is recommended for its excellent preservation of morphology and enzyme activity.
Volume 34,
Issue 10,
pp. 1317-1323,
10/01/1986
Copyright © 1986 by The Histochemical Society
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