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Cancer Cell International
Published in: Cancer Cell International 1/2013

Open Access 01-12-2013 | Primary research

Caspase-2 is involved in cell death induction by taxanes in breast cancer cells

Authors: Michael Jelínek, Kamila Balušíková, Dana Kopperová, Vlasta Němcová-Fürstová, Jan Šrámek, Julie Fidlerová, Ilaria Zanardi, Iwao Ojima, Jan Kovář

Published in: Cancer Cell International | Issue 1/2013

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Abstract

Background

We studied the role of caspase-2 in apoptosis induction by taxanes (paclitaxel, novel taxane SB-T-1216) in breast cancer cells using SK-BR-3 (nonfunctional p53, functional caspase-3) and MCF-7 (functional p53, nonfunctional caspase-3) cell lines.

Results

Both taxanes induced apoptosis in SK-BR-3 as well as MCF-7 cells. Caspase-2 activity in SK-BR-3 cells increased approximately 15-fold within 48 h after the application of both taxanes at the death-inducing concentration (100 nM). In MCF-7 cells, caspase-2 activity increased approximately 11-fold within 60 h after the application of taxanes (300 nM). Caspase-2 activation was confirmed by decreasing levels of procaspase-2, increasing levels of cleaved caspase-2 and the cleavage of caspase-2 substrate golgin-160. The inhibition of caspase-2 expression using siRNA increased the number of surviving cells more than 2-fold in MCF-7 cells, and at least 4-fold in SK-BR-3 cells, 96 h after the application of death-inducing concentration of taxanes. The inhibition of caspase-2 expression also resulted in decreased cleavage of initiator caspases (caspase-8, caspase-9) as well as executioner caspases (caspase-3, caspase-7) in both cell lines after the application of taxanes. In control cells, caspase-2 seemed to be mainly localized in the nucleus. After the application of taxanes, it was released from the nucleus to the cytosol, due to the long-term disintegration of the nuclear envelope, in both cell lines. Taxane application led to some formation of PIDDosome complex in both cell lines within 24 h after the application. After taxane application, p21WAF1/CIP1 expression was only induced in MCF-7 cells with functional p53. However, taxane application did not result in a significant increase of PIDD expression in either SK-BR-3 or MCF-7 cells. The inhibition of RAIDD expression using siRNA did not affect the number of surviving SK-BR-3 and MCF-7 cells after taxane application at all.

Conclusion

Caspase-2 is required, at least partially, for apoptosis induction by taxanes in tested breast cancer cells. We suggest that caspase-2 plays the role of an apical caspase in these cells. Caspase-2 seems to be activated via other mechanism than PIDDosome formation. It follows the release of caspase-2 from the nucleus to the cytosol.
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Metadata
Title
Caspase-2 is involved in cell death induction by taxanes in breast cancer cells
Authors
Michael Jelínek
Kamila Balušíková
Dana Kopperová
Vlasta Němcová-Fürstová
Jan Šrámek
Julie Fidlerová
Ilaria Zanardi
Iwao Ojima
Jan Kovář
Publication date
01-12-2013
Publisher
BioMed Central
Published in
Cancer Cell International / Issue 1/2013
Electronic ISSN: 1475-2867
DOI
https://doi.org/10.1186/1475-2867-13-42

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