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Mañas A, Wang S, Nelson A, Li J, Zhao Y, Zhang H, Davis A, Xie B, Maltsev N, Xiang J. The functional domains for Bax∆2 aggregate-mediated caspase 8-dependent cell death. Exp Cell Res 2017; 359:342-355. [PMID: 28807790 PMCID: PMC5718386 DOI: 10.1016/j.yexcr.2017.08.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 08/07/2017] [Accepted: 08/08/2017] [Indexed: 01/09/2023]
Abstract
Bax∆2 is a functional pro-apoptotic Bax isoform having alterations in its N-terminus, but sharing the rest of its sequence with Baxα. Bax∆2 is unable to target mitochondria due to the loss of helix α1. Instead, it forms cytosolic aggregates and activates caspase 8. However, the functional domain(s) responsible for BaxΔ2 behavior have remained elusive. Here we show that disruption of helix α1 makes Baxα mimic the behavior of Bax∆2. However, the other alterations in the Bax∆2 N-terminus have no significant impact on aggregation or cell death. We found that the hallmark BH3 domain is necessary but not sufficient for aggregation-mediated cell death. We also noted that the core region shared by Baxα and Bax∆2 is required for the formation of large aggregates, which is essential for BaxΔ2 cytotoxicity. However, aggregation by itself is unable to trigger cell death without the C-terminus. Interestingly, the C-terminal helical conformation, not its primary sequence, appears to be critical for caspase 8 recruitment and activation. As Bax∆2 shares core and C-terminal sequences with most Bax isoforms, our results not only reveal a structural basis for Bax∆2-induced cell death, but also imply an intrinsic potential for aggregate-mediated caspase 8-dependent cell death in other Bax family members.
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Affiliation(s)
- Adriana Mañas
- Department of Biology, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Sheng Wang
- Human Genetics Department, Computation Institute, University of Chicago, Chicago, IL 60637, USA
| | - Adam Nelson
- Department of Biology, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Jiajun Li
- Department of Biology, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Yu Zhao
- Department of Biology, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Huaiyuan Zhang
- Department of Biology, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Aislinn Davis
- Department of Biology, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Bingqing Xie
- Department of Computer Science, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Natalia Maltsev
- Human Genetics Department, Computation Institute, University of Chicago, Chicago, IL 60637, USA
| | - Jialing Xiang
- Department of Biology, Illinois Institute of Technology, Chicago, IL 60616, USA.
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Mignani S, El Brahmi N, Eloy L, Poupon J, Nicolas V, Steinmetz A, El Kazzouli S, Bousmina MM, Blanchard-Desce M, Caminade AM, Majoral JP, Cresteil T. Anticancer copper(II) phosphorus dendrimers are potent proapoptotic Bax activators. Eur J Med Chem 2017; 132:142-156. [PMID: 28350998 DOI: 10.1016/j.ejmech.2017.03.035] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 03/16/2017] [Accepted: 03/18/2017] [Indexed: 12/21/2022]
Abstract
A multivalent phosphorus dendrimer 1G3 and its corresponding Cu-complex, 1G3-Cu have been recently identified as agents retaining high antiproliferative potency. This antiproliferative capacity was preserved in cell lines overexpressing the efflux pump ABC B1, whereas cross-resistance was observed in ovarian cancer cell lines resistant to cisplatin. Theoretical 3D models were constructed: the dendrimers appear as irregularly shaped disk-like nano-objects of about 22 Å thickness and 49 Å diameter, which accumulated in cells after penetration by endocytosis. To get insight in their mode of action, cell death pathways have been examined in human cancer cell lines: early apoptosis was followed by secondary necrosis after multivalent phosphorus dendrimers exposure. The multivalent plain phosphorus dendrimer 1G3 moderately activated caspase-3 activity, in contrast with the multivalent Cu-conjugated phosphorus dendrimer 1G3-Cu which strikingly reduced the caspase-3 content and activity. This decrease of caspase activity is not related to the presence of copper, since inorganic copper has no or little effect on caspase-3. Conversely the potent apoptosis activation could be related to a noticeable translocation of Bax to the mitochondria, resulting in the release of AIF into the cytosol, its translocation to the nucleus and a severe DNA fragmentation, without alteration of the cell cycle. The multivalent Cu-conjugated phosphorus dendrimer is more efficient than its non-complexed analog to activate this pathway in close relationship with the higher antiproliferative potency. Therefore, this multivalent Cu-conjugated phosphorus dendrimer 1G3-Cu can be considered as a new and promising first-in-class antiproliferative agent with a distinctive mode of action, inducing apoptosis tumor cell death through Bax activation pathway.
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Affiliation(s)
- Serge Mignani
- Université Paris Descartes, PRES Sorbonne Paris Cité, CNRS UMR 860, Laboratoire de Chimie et de Biochimie pharmacologiques et toxicologiques, 45, rue des Saints Pères, 75006 Paris, France.
| | - Nabil El Brahmi
- Euromed Research Institute, Euro-Mediterranean University of Fes (UEMF), Route de Meknes, 30000, Fès, Morocco; Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France; Université de Toulouse UPS, INPT, F 31077 Toulouse Cedex 4, France
| | - Laure Eloy
- ICSN-CNRS UPR 2301, Avenue de la Terrasse, 91198 Gif sur Yvette, France
| | - Joel Poupon
- Laboratoire de Toxicologie Biologique, Hôpital Lariboisière, 75475 Paris Cedex 10, France
| | - Valérie Nicolas
- IPSIT, Faculté de Pharmacie, Université Paris Sud, 92290 Chatenay-Malabry, France
| | - Anke Steinmetz
- Sanofi R&D, LGCR, Centre de Recherche Vitry-Alfortville, 94403 Vitry-sur-Seine Cedex, France
| | - Said El Kazzouli
- Euromed Research Institute, Euro-Mediterranean University of Fes (UEMF), Route de Meknes, 30000, Fès, Morocco
| | - Mosto M Bousmina
- Euromed Research Institute, Euro-Mediterranean University of Fes (UEMF), Route de Meknes, 30000, Fès, Morocco
| | - Mireille Blanchard-Desce
- Institut des Sciences Moléculaires, UMR 5255, Université de Bordeaux, 351 cours de la Libération, Talence, France
| | - Anne-Marie Caminade
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France; Université de Toulouse UPS, INPT, F 31077 Toulouse Cedex 4, France
| | - Jean-Pierre Majoral
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France; Université de Toulouse UPS, INPT, F 31077 Toulouse Cedex 4, France.
| | - Thierry Cresteil
- ICSN-CNRS UPR 2301, Avenue de la Terrasse, 91198 Gif sur Yvette, France; IPSIT, Faculté de Pharmacie, Université Paris Sud, 92290 Chatenay-Malabry, France.
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Hu K, Tian Y, Du Y, Huang L, Chen J, Li N, Liu W, Liang Z, Zhao L. Atrazine promotes RM1 prostate cancer cell proliferation by activating STAT3 signaling. Int J Oncol 2016; 48:2166-74. [PMID: 26984284 DOI: 10.3892/ijo.2016.3433] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 02/17/2016] [Indexed: 11/05/2022] Open
Abstract
Atrazine, a widely used pesticide, is frequently detected in soil and surface water, which alarms epidemiologists and medical professionals because of its potential deleterious effects on health. Indeed, atrazine is a potent endocrine disruptor that increases aromatase expression in some human cancer cell lines. Both animal and human studies have suggested that atrazine is possibly carcinogenic, although discrepant results have been reported. In this study, RM1 cells were used to explore the atrazine effects on prostate cancer. Proliferation, migration and invasion of RM1 cells were assessed by colony formation, wound-healing and invasion assays, respectively, after in vitro exposure to atrazine. In addition, an RM1 cell xenograft model was generated to evaluate the effects of atrazine in vivo. To explore the molecular mechanisms, qRT‑PCR, immunohistochemistry, and western blot analyses were employed to detect mRNA and protein levels of STAT3 signaling and cell cycle related proteins, including p53, p21, cyclin B1 and cyclin D1. Interestingly, RM1 cell proliferation was increased after treatment with atrazine, concomitantly with STAT3 signaling activation. These results suggest that atrazine promotes RM1 cell growth in vitro and in vivo by activating STAT3 signaling.
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Affiliation(s)
- Kebang Hu
- The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Yong Tian
- College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Yanwei Du
- Changchun University of Chinese Medicine, Changchun, Jilin 130117, P.R. China
| | - Liandi Huang
- College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Junyu Chen
- College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Na Li
- Changchun University of Chinese Medicine, Changchun, Jilin 130117, P.R. China
| | - Wei Liu
- Jilin Academy of Environmental Science, Jilin, P.R. China
| | - Zuowen Liang
- The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Lijing Zhao
- College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
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Johnston SJ, Carroll JS. Transcription factors and chromatin proteins as therapeutic targets in cancer. BIOCHIMICA ET BIOPHYSICA ACTA 2015; 1855:183-92. [PMID: 25721328 DOI: 10.1016/j.bbcan.2015.02.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 02/09/2015] [Accepted: 02/09/2015] [Indexed: 01/15/2023]
Abstract
Targeting the factors that regulate gene transcription is a compelling strategy in cancer therapeutics. Traditionally, these have been considered intractable targets, but recent work has revealed novel strategies for the regulation of transcription factor activity in cancer. This review will highlight some of the emerging concepts and provide examples where agents that target transcription factors are being exploited clinically for cancer therapies.
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Affiliation(s)
- Simon J Johnston
- Cancer Research UK Cambridge Institute, University of Cambridge, Robinson Way, Cambridge CB2 0RE, UK
| | - Jason S Carroll
- Cancer Research UK Cambridge Institute, University of Cambridge, Robinson Way, Cambridge CB2 0RE, UK.
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