Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/28398
Title: Acquired differential regulation of caspase-8 in cisplatin-resistant non-small-cell lung cancer.
Authors: Paul, I.
Chacko, A.D.
Stasik, I.
Busacca, S.
Crawford, N.
McCoy, F.
McTavish, N.
Wilson, B.
Barr, M.
O'Byrne, K.J.
Longley, D.B.
Fennell, Dean A.
First Published: 21-Sep-2012
Publisher: Nature Publishing Group for Associazione Differenziamento e Morte Cellulare
Citation: Cell Death and Disease, 2012, 3, e449
Abstract: Failure to efficiently induce apoptosis contributes to cisplatin resistance in non-small-cell lung cancer (NSCLC). Although BCL-2-associated X protein (BAX) and BCL-2 antagonist killer (BAK) are critical regulators of the mitochondrial apoptosis pathway, their requirement has not been robustly established in relation to cisplatin. Here, we show that cisplatin can efficiently bypass mitochondrial apoptosis block caused by loss of BAX and BAK, via activation of the extrinsic death receptor pathway in some model cell lines. Apoptosis resistance following cisplatin can only be observed when both extrinsic and intrinsic pathways are blocked, consistent with redundancy between mitochondrial and death receptor pathways in cisplatin-induced apoptosis. In H460 NSCLC cells, caspase-8 cleavage was shown to be induced by cisplatin and is dependent on death receptor 4, death receptor 5, Fas-associated protein with death domain, acid sphingomyelinase and ceramide synthesis. In contrast, cisplatin-resistant cells fail to activate caspase-8 via this pathway despite conserving sensitivity to death ligand-driven activation. Accordingly, caspase-8 activation block acquired during cisplatin resistance, can be bypassed by death receptor agonism.
DOI Link: 10.1038/cddis.2012.186
eISSN: 2041-4889
Links: http://www.nature.com/cddis/journal/v3/n12/full/cddis2012186a.html
http://hdl.handle.net/2381/28398
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2012, Nature Publishing Group. This work is licensed under the Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/.
Description: PMCID: PMC3542622
Appears in Collections:Published Articles, Dept. of Cancer Studies and Molecular Medicine

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