Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/32534
Title: Sabutoclax (BI97C1) and BI112D1, putative inhibitors of MCL-1, induce mitochondrial fragmentation either upstream of or independent of apoptosis.
Authors: Varadarajan, S.
Butterworth, M.
Wei, J.
Pellecchia, M.
Dinsdale, D.
Cohen, G. M.
First Published: 3-Mar-2014
Publisher: Elsevier
Citation: Neoplasia, 2013, 15 (5), pp. 568-578
Abstract: Owing to the high levels of antiapoptotic B-cell lymphoma 2 (BCL-2) family members observed in several cancers, there has been a major effort to develop inhibitors of the BCL2-family as chemotherapeutic agents. Of the different members in the BCL-2 family, myeloid cell leukemia sequence 1 (MCL-1) is commonly amplified in human tumors and is associated with their relapse and chemoresistance. As a result, specific inhibitors of MCL-1 are being designed to treat resistant tumors. However, there is increasing evidence for other nonapoptotic roles of the BCL-2 family, ranging from ionic homeostasis and autophagy to the regulation of fission-fusion dynamics in subcellular organelles, including the endoplasmic reticulum and mitochondria. In this study, we characterize the specificity of two novel putative MCL-1 inhibitors, BI97C1 (Sabutoclax) and BI112D1, in inducing apoptosis in a BAX/BAK-dependent manner and in an MCL-1-dependent system. In addition to their being proapoptotic, these inhibitors also cause enhanced mitochondrial fragmentation that accompanies a time-dependent loss of optic atrophy 1 (OPA1), suggesting an impairment of mitochondrial fusion. This mitochondrial fragmentation occurs independently of dynamin-related protein 1 (DRP1)-mediated fission activity and, unlike most apoptotic stimuli, occurs upstream of and/or independent of BAX, BAK, and other BH3-only proteins. Furthermore, this mitochondrial fragmentation occurred rapidly and preceded other hallmarks of apoptosis, including the loss in mitochondrial membrane potential and the release of cytochrome c. Although such mitochondrial fragmentation did not deplete total cellular adenosine triphosphate (ATP) or alter other mitochondrial complexes, there was significant accumulation of reactive oxygen species.
DOI Link: 10.1593/neo.13230
ISSN: 1522-8002
eISSN: 1476-5586
Links: http://www.sciencedirect.com/science/article/pii/S1476558613800425
http://hdl.handle.net/2381/32534
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2014. This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/3.0/ ), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Appears in Collections:Published Articles, Dept. of Biochemistry

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