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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Thomas, Douglas D. / Turk, Boris / Wittinghofer, Alfred

IMPACT FACTOR 2017: 3.022

CiteScore 2018: 3.09

SCImago Journal Rank (SJR) 2018: 1.482
Source Normalized Impact per Paper (SNIP) 2018: 0.820

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Volume 384, Issue 3


Invasiveness of Transformed Human Breast Epithelial Cell Lines Is Related to Cathepsin B and Inhibited by Cysteine Proteinase Inhibitors

A. Bervar / I. Zajc / N. Sever / N. Katunuma / B.F. Sloane / T.T. Lah
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/BC.2003.050


The activities of the lysosomal cysteine proteinases cathepsin B and L are regulated by their endogenous inhibitors, stefins A and B, and cystatin C, and their imbalance may be associated with increased invasiveness and development of the malignant cell phenotype. The aim of this study was to investigate mRNA, protein and activity levels of the above proteins in relation to in vitro invasiveness and to the reported in vivo tumorigenicity of four human breast tumor cell lines: the spontaneously immortalized cell line MCF10A, its cHaras transfectant MCF10AT, and two tumorigenic derivative cell lines, MCF10AT-Ca1a and MCF10AT-Ca1d. Invasiveness did not correlate with tumorigenicity, since the MCF10AT cell was the most invasive and the remaining three were at about half of its level. Cathepsin B expression paralleled the in vitro invasiveness through matrigel at all levels of expression, but cathepsin L did not. Stefin levels were elevated severalfold in the tumorigenic cell lines, but not in MCF10AT. The hypothesis that cathepsin B plays an active role in the invasion of breast cancer cell lines was confirmed by the fact that synthetic cysteine proteinase inhibitors, particularly those selective for cathepsin B, significantly reduced the invasion of the MCF10AT cells.

About the article

Published Online: 2005-06-01

Published in Print: 2003-03-14

Citation Information: Biological Chemistry, Volume 384, Issue 3, Pages 447–455, ISSN (Print) 1431-6730, DOI: https://doi.org/10.1515/BC.2003.050.

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