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Journal of Histochemistry and Cytochemistry, Vol. 48, 219-228, February 2000, Copyright © 2000, The Histochemical Society, Inc.

ARTICLE

Osteoclastic Tartrate-resistant Acid Phosphatase (Acp 5): Its Localization to Dendritic Cells and Diverse Murine Tissues

Alison R. Haymana, Alison J. Bunea, John R. Bradleya, Jeremy Rashbassa, and Timothy M. Coxa
a Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Cambridge, United Kingdom

Correspondence to: Alison R. Hayman, Dept. of Medicine, Box 157, Addenbrooke's Hospital, Cambridge CB2 2QQ, UK.

Tartrate-resistant acid phosphatase (TRAP) is a histochemical marker of the osteoclast. It is also characteristic of monohistiocytes, particularly alveolar macrophages, and is associated with diverse pathological conditions, including hairy cell leukemia and AIDS encephalopathy. To study the biology of this enzyme, we investigated its expression and activity in mouse tissues. Confocal fluorescence studies showed that TRAP is localized to the lysosomal compartment of macrophages. In adult mice, high activities of the enzyme were demonstrated in bone, spleen, liver, thymus, and colon, with lower amounts in lung, stomach, skin, brain, and kidney. Trace amounts were detected in testis, muscle, and heart. Expression of TRAP mRNA was investigated in tissue sections by in situ hybridization and protein expression was monitored by histochemical staining or immunohistochemically. TRAP is widely expressed in many tissues, where it is associated with cells principally originating from the bone marrow, including those of osteoclast/macrophage lineage. The cellular distribution of TRAP mRNA and enzyme antigen in the tissues corresponds closely to that of cells staining with an antibody directed to the CD80 (B7) antigen. Therefore, to confirm its putative localization in dendritic cells, isolated bone marrow dendritic cells were matured in culture. These co-stained strongly for TRAP protein and the CD80 antigen. These studies demonstrate that TRAP is a lysosomal enzyme that is found in diverse murine tissues, where it is expressed in dendritic cells as well as osteoclasts and macrophages, as previously shown. (J Histochem Cytochem 48:219–227, 2000)

Key Words: tartrate-resistant acid phosphatase, dendritic, macrophage, lysosomal, expression, localization


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