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Immunocytochemical localization of the ectoenzyme aminopeptidase N in the human breast

AJ Atherton, P Monaghan, MJ Warburton and BA Gusterson

Institute of Cancer Research, Haddow Laboratories, Sutton, Surrey, United Kingdom.

The ectoenzyme aminopeptidase N (APN) was localized in the normal human breast at both the light microscopic and the ultrastructural level. APN was expressed on intralobular and interlobular fibroblasts and on the apical surface of some luminal epithelial cells. This enzyme was not detected on either myoepithelial cells and their associated basement membrane or capillary endothelium. Furthermore, the staining pattern was maintained in benign and malignant breast disease. APN belongs to a family of enzymes that hydrolyze peptides in the extracellular space. As with other ectoenzymes present in the breast, APN expression is restricted to specific cell types. This pattern of expression may indicate a role for these enzymes in the biology of the normal breast.

Volume 40, Issue 5, pp. 705-710, 05/01/1992
Copyright © 1992 by The Histochemical Society


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