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Journal of Cell Science, Vol 87, Issue 1 145-154, Copyright © 1987 by Company of Biologists

JOURNAL ARTICLES

Cytochemical and biochemical evidence of cathepsin B in malignant, transformed and normal breast epithelial cells

E Krepela, J Bartek, D Skalkova, J Vicar, D Rasnick, J Taylor-Papadimitriou and RC Hallowes
Research Institute of Clinical and Experimental Oncology, Brno, Czechoslovakia.

Human breast cancer cell lines, as well as transformed mammary epithelial cells (HBL-100) and growth-stimulated normal breast epithelial cells showed positive cytochemical reaction with the proteinase substrate 2-(N-benzyloxycarbonyl-L-arginyl-L-arginylamido)-4-methoxynapht halene, in the presence of 5-nitrosalicylaldehyde. The reaction product, small fluorescent granules, was distributed throughout the cytoplasm, in the perinuclear zone, in some cytoplasmic projections, and at the cell surface. Using a panel of various proteinase inhibitors, we found that the formation of the reaction product was an enzymic function of a cysteine proteinase. Using the substrate 7-(N-benzyloxycarbonyl-L-arginyl-L-arginylamido)-4-methylcoumarin, we evaluated some biochemical properties of the cysteine proteinase, including pH-activity profile, pH stability, apparent relative molecular mass and sensitivity toward various proteinase inhibitors. We found that the proteinase from the studied breast epithelial cells exhibited characteristics of a mature form of cathepsin B. Taken together, the cytochemical and biochemical data provide evidence that human breast epithelial cells of cancer origin, as well as in the transformed or growth-stimulated state express active cathepsin B and compartmentalize it into specific subcellular sites.


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© The Company of Biologists Ltd 1987