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The distribution of lysosomal cathepsin D in cardiac myocytes

RS Decker, ML Decker and AR Poole

Lysosomal cathepsin D has been localized with the electron microscope employing an indirect immunohistochemical method using peroxidase labeled, monospecific antibody Fab' subunits. The acid proteinase has been demonstrated within secondary lysosomes of cardiac myocytes and interstitial cells, but not in components of the Golgi apparatus or endoplasmic reticulum. Incubations with a variety of peroxidatic inhibitors suggests that the staining that is observed in secondary lysosomes is attributable to the peroxidase-labeled antibody and not to endogenous oxidation of DAB. The protocol outlined here provides a reproducible method to localize the major lysosomal acid proteinase of the heart at the subcellular level.

Volume 28, Issue 3, pp. 231-237, 03/01/1980
Copyright © 1980 by The Histochemical Society


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The Journal of Histochemistry & Cytochemistry is owned, published, and licensed by The Histochemical Society © 1980