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Hussain S, Guo Y, Huo Y, Shi J, Hou Y. Regulation of cancer progression by CK2: an emerging therapeutic target. Med Oncol 2024; 41:94. [PMID: 38526625 DOI: 10.1007/s12032-024-02316-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 01/28/2024] [Indexed: 03/27/2024]
Abstract
Casein kinase II (CK2) is an enzyme with pleiotropic kinase activity that catalyzes the phosphorylation of lots of substrates, including STAT3, p53, JAK2, PTEN, RELA, and AKT, leading to the regulation of diabetes, cardiovascular diseases, angiogenesis, and tumor progression. CK2 is observed to have high expression in multiple types of cancer, which is associated with poor prognosis. CK2 holds significant importance in the intricate network of pathways involved in promoting cell proliferation, invasion, migration, apoptosis, and tumor growth by multiple pathways such as JAK2/STAT3, PI3K/AKT, ATF4/p21, and HSP90/Cdc37. In addition to the regulation of cancer progression, increasing evidence suggests that CK2 could regulate tumor immune responses by affecting immune cell activity in the tumor microenvironment resulting in the promotion of tumor immune escape. Therefore, inhibition of CK2 is initially proposed as a pivotal candidate for cancer treatment. In this review, we discussed the role of CK2 in cancer progression and tumor therapy.
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Affiliation(s)
- Shakeel Hussain
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, People's Republic of China
| | - Yilei Guo
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, People's Republic of China
| | - Yu Huo
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, People's Republic of China
| | - Juanjuan Shi
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, People's Republic of China
| | - Yongzhong Hou
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, People's Republic of China.
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2
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Skalka GL, Tsakovska M, Murphy DJ. Kinase signalling adaptation supports dysfunctional mitochondria in disease. Front Mol Biosci 2024; 11:1354682. [PMID: 38434478 PMCID: PMC10906720 DOI: 10.3389/fmolb.2024.1354682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 01/15/2024] [Indexed: 03/05/2024] Open
Abstract
Mitochondria form a critical control nexus which are essential for maintaining correct tissue homeostasis. An increasing number of studies have identified dysregulation of mitochondria as a driver in cancer. However, which pathways support and promote this adapted mitochondrial function? A key hallmark of cancer is perturbation of kinase signalling pathways. These pathways include mitogen activated protein kinases (MAPK), lipid secondary messenger networks, cyclic-AMP-activated (cAMP)/AMP-activated kinases (AMPK), and Ca2+/calmodulin-dependent protein kinase (CaMK) networks. These signalling pathways have multiple substrates which support initiation and persistence of cancer. Many of these are involved in the regulation of mitochondrial morphology, mitochondrial apoptosis, mitochondrial calcium homeostasis, mitochondrial associated membranes (MAMs), and retrograde ROS signalling. This review will aim to both explore how kinase signalling integrates with these critical mitochondrial pathways and highlight how these systems can be usurped to support the development of disease. In addition, we will identify areas which require further investigation to fully understand the complexities of these regulatory interactions. Overall, this review will emphasize how studying the interaction between kinase signalling and mitochondria improves our understanding of mitochondrial homeostasis and can yield novel therapeutic targets to treat disease.
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Affiliation(s)
- George L. Skalka
- School of Cancer Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Mina Tsakovska
- School of Cancer Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Daniel J. Murphy
- School of Cancer Sciences, University of Glasgow, Glasgow, United Kingdom
- CRUK Scotland Institute, Glasgow, United Kingdom
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3
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Holloway J, Seeley A, Cobbe N, Turkington RC, Longley DB, Evergren E. The E3 ubiquitin ligase Itch regulates death receptor and cholesterol trafficking to affect TRAIL-mediated apoptosis. Cell Death Dis 2024; 15:40. [PMID: 38216558 PMCID: PMC10786908 DOI: 10.1038/s41419-023-06417-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 12/15/2023] [Accepted: 12/22/2023] [Indexed: 01/14/2024]
Abstract
The activation of apoptosis signalling by TRAIL (TNF-related apoptosis-inducing ligand) through receptor binding is a fundamental mechanism of cell death induction and is often perturbed in cancer cells to enhance their cell survival and treatment resistance. Ubiquitination plays an important role in the regulation of TRAIL-mediated apoptosis, and here we investigate the role of the E3 ubiquitin ligase Itch in TRAIL-mediated apoptosis in oesophageal cancer cells. Knockdown of Itch expression results in resistance to TRAIL-induced apoptosis, caspase-8 activation, Bid cleavage and also promotes cisplatin resistance. Whilst the assembly of the death-inducing signalling complex (DISC) at the plasma membrane is not perturbed relative to the control, TRAIL-R2 is mis-localised in the Itch-knockdown cells. Further, we observe significant changes to mitochondrial morphology alongside an increased cholesterol content. Mitochondrial cholesterol is recognised as an important anti-apoptotic agent in cancer. Cells treated with a drug that increases mitochondrial cholesterol levels, U18666A, shows a protection from TRAIL-induced apoptosis, reduced caspase-8 activation, Bid cleavage and cisplatin resistance. We demonstrate that Itch knockdown cells are less sensitive to a Bcl-2 inhibitor, show impaired activation of Bax, cytochrome c release and an enhanced stability of the cholesterol transfer protein STARD1. We identify a novel protein complex composed of Itch, the mitochondrial protein VDAC2 and STARD1. We propose a mechanism where Itch regulates the stability of STARD1. An increase in STARD1 expression enhances cholesterol import to mitochondria, which inhibits Bax activation and cytochrome c release. Many cancer types display high mitochondrial cholesterol levels, and oesophageal adenocarcinoma tumours show a correlation between chemotherapy resistance and STARD1 expression which is supported by our findings. This establishes an important role for Itch in regulation of extrinsic and intrinsic apoptosis, mitochondrial cholesterol levels and provides insight to mechanisms that contribute to TRAIL, Bcl-2 inhibitor and cisplatin resistance in cancer cells.
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Affiliation(s)
- James Holloway
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, 97 Lisburn Road, BT9 7AE, Belfast, UK
| | - Aidan Seeley
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, 97 Lisburn Road, BT9 7AE, Belfast, UK
| | - Neville Cobbe
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, 97 Lisburn Road, BT9 7AE, Belfast, UK
| | - Richard C Turkington
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, 97 Lisburn Road, BT9 7AE, Belfast, UK
| | - Daniel B Longley
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, 97 Lisburn Road, BT9 7AE, Belfast, UK
| | - Emma Evergren
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, 97 Lisburn Road, BT9 7AE, Belfast, UK.
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4
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Firnau MB, Brieger A. CK2 and the Hallmarks of Cancer. Biomedicines 2022; 10:1987. [PMID: 36009534 PMCID: PMC9405757 DOI: 10.3390/biomedicines10081987] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 08/08/2022] [Accepted: 08/10/2022] [Indexed: 11/29/2022] Open
Abstract
Cancer is a leading cause of death worldwide. Casein kinase 2 (CK2) is commonly dysregulated in cancer, impacting diverse molecular pathways. CK2 is a highly conserved serine/threonine kinase, constitutively active and ubiquitously expressed in eukaryotes. With over 500 known substrates and being estimated to be responsible for up to 10% of the human phosphoproteome, it is of significant importance. A broad spectrum of diverse types of cancer cells has been already shown to rely on disturbed CK2 levels for their survival. The hallmarks of cancer provide a rationale for understanding cancer's common traits. They constitute the maintenance of proliferative signaling, evasion of growth suppressors, resisting cell death, enabling of replicative immortality, induction of angiogenesis, the activation of invasion and metastasis, as well as avoidance of immune destruction and dysregulation of cellular energetics. In this work, we have compiled evidence from the literature suggesting that CK2 modulates all hallmarks of cancer, thereby promoting oncogenesis and operating as a cancer driver by creating a cellular environment favorable to neoplasia.
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Affiliation(s)
| | - Angela Brieger
- Department of Internal Medicine I, Biomedical Research Laboratory, University Hospital Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
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5
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Nipun VB, Amin KA. Recent Advances in Protein Kinase CK2, a Potential Therapeutic Target in Cancer. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2022; 48:919-931. [DOI: 10.1134/s1068162022050144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- V. B. Nipun
- Cancer Research Center, Shantou University Medical Collage, Shantou, Guangdong, 515041, PR China
- Department of Chemistry, Faculty of Science, University of Imam Abdulrahman Bin Faisal university, P.O. Box 1982, Dammam, 31441, Saudi Arabia
| | - K. A. Amin
- Department of Chemistry, Faculty of Science, University of Imam Abdulrahman Bin Faisal university, P.O. Box 1982, Dammam, 31441, Saudi Arabia
- Basic and Applied Scientific Research Center, Imam Abdulrahman Bin Faisal university, P.O. Box 1982, Dammam, 31441, Saudi Arabia
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6
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Samaiya PK, Krishnamurthy S, Kumar A. Mitochondrial dysfunction in perinatal asphyxia: role in pathogenesis and potential therapeutic interventions. Mol Cell Biochem 2021; 476:4421-4434. [PMID: 34472002 DOI: 10.1007/s11010-021-04253-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 08/20/2021] [Indexed: 01/13/2023]
Abstract
Perinatal asphyxia (PA)-induced brain injury may present as hypoxic-ischemic encephalopathy in the neonatal period, and long-term sequelae such as spastic motor deficits, intellectual disability, seizure disorders and learning disabilities. The brain injury is secondary to both the hypoxic-ischemic event and oxygenation-reperfusion following resuscitation. Following PA, a time-dependent progression of neuronal insult takes place in terms of transition of cell death from necrosis to apoptosis. This transition is the result of time-dependent progression of pathomechanisms which involve excitotoxicity, oxidative stress, and ultimately mitochondrial dysfunction in developing brain. More precisely mitochondrial respiration is suppressed and calcium signalling is dysregulated. Consequently, Bax-dependent mitochondrial permeabilization occurs leading to release of cytochrome c and activation of caspases leading to transition of cell death in developing brain. The therapeutic window lies within this transition process. At present, therapeutic hypothermia (TH) is the only clinical treatment available for treating moderate as well as severe asphyxia in new-born as it attenuates secondary loss of high-energy phosphates (ATP) (Solevåg et al. in Free Radic Biol Med 142:113-122, 2019; Gunn et al. in Pediatr Res 81:202-209, 2017), improving both short- and long-term outcomes. Mitoprotective therapies can offer a new avenue of intervention alone or in combination with therapeutic hypothermia for babies with birth asphyxia. This review will explore these mitochondrial pathways, and finally will summarize past and current efforts in targeting these pathways after PA, as a means of identifying new avenues of therapeutic intervention.
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Affiliation(s)
- Puneet K Samaiya
- Department of Pharmacy, Shri G.S. Institute of Technology and Science, Indore, MP, 452003, India.
| | - Sairam Krishnamurthy
- Neurotherapeutics Lab, Pharmaceutical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India
| | - Ashok Kumar
- Department of Pediatrics, Institute of Medical Sciences, BHU, Varanasi, UP, India
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7
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Evaluation of the effects of phosphorylation of synthetic peptide substrates on their cleavage by caspase-3 and -7. Biochem J 2021; 478:2233-2245. [PMID: 34037204 DOI: 10.1042/bcj20210255] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/25/2021] [Accepted: 05/25/2021] [Indexed: 02/02/2023]
Abstract
Caspases are a family of enzymes that play roles in cell death and inflammation. It has been suggested that in the execution phase of the apoptotic pathway, caspase-3, -6 and -7 are involved. The substrate specificities of two proteases (caspases 3 and 7) are highly similar, which complicates the design of compounds that selectively interact with a single enzyme exclusively. The recognition of residues other than Asp in the P1 position of the substrate by caspase-3/-7 has been reported, promoting interest in the effects of phosphorylation of amino acids in the direct vicinity of the scissile bond. To evaluate conflicting reports on this subject, we synthesized a series of known caspase-3 and -7 substrates and phosphorylated analogs, performed enzyme kinetic assays and mapped the peptide cleavage sites using internally quenched fluorescent peptide substrates. Caspases 3 and 7 will tolerate pSer at the P1 position but only poorly at the P2' position. Our investigation demonstrates the importance of peptide length and composition in interpreting sequence/activity relationships. Based on the results, we conclude that the relationship between caspase-3/-7 and their substrates containing phosphorylated amino acids might depend on the steric conditions and not be directly connected with ionic interactions. Thus, the precise effect of phospho-amino acid residues located in the vicinity of the cleaved bond on the regulation of the substrate specificity of caspases remains difficult to predict. Our observations allow to predict that natural phosphorylated proteins may be cleaved by caspases, but only when extended substrate binding site interactions are satisfied.
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8
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Janda E, Nepveu F, Calamini B, Ferry G, Boutin JA. Molecular Pharmacology of NRH:Quinone Oxidoreductase 2: A Detoxifying Enzyme Acting as an Undercover Toxifying Enzyme. Mol Pharmacol 2020; 98:620-633. [DOI: 10.1124/molpharm.120.000105] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 08/11/2020] [Indexed: 01/02/2023] Open
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9
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Boutin JA, Ferry G. Is There Sufficient Evidence that the Melatonin Binding SiteMT3Is Quinone Reductase 2? J Pharmacol Exp Ther 2018; 368:59-65. [DOI: 10.1124/jpet.118.253260] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 10/26/2018] [Indexed: 12/15/2022] Open
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10
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Sensitization of glioblastoma cells to TRAIL-induced apoptosis by IAP- and Bcl-2 antagonism. Cell Death Dis 2018; 9:1112. [PMID: 30385739 PMCID: PMC6212537 DOI: 10.1038/s41419-018-1160-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 10/11/2018] [Accepted: 10/15/2018] [Indexed: 01/25/2023]
Abstract
Due to the lack of effective treatments for glioblastoma (GBM), we here studied the responsiveness of GBM cell lines to the combination of death ligand, TRAIL and the IAP antagonist, TL32711 (Birinapant). Responses were highly heterogeneous, with synergistic apoptosis as well as treatment resistance observed. Caspase-8 and Bid, together with caspase-3, form a nonlinear signalling hub that efficiently induced apoptosis in responder cell lines. Cells resistant to TRAIL/TL32711 expressed low amounts of procaspase-8 and Bid and poorly activated caspase-3. We therefore hypothesised that improving caspase-8 activation or sensitising mitochondria to truncated Bid (tBid) could convert non-responder GBM cell lines to responders. Mathematical simulations of both strategies predicted mitochondrial sensitization to tBid would outperform enhancing caspase-8 activation. Indeed, antagonising Bcl-2 by ABT-199 allowed TRAIL/TL32711 response synergies to manifest in otherwise TRAIL resistant cell lines. These findings were further corroborated in experiments with a translationally relevant hexavalent TRAIL variant. Our study therefore demonstrates that a high caspase-8/Bid signature is associated with synergistic TRAIL/TL32711-induced apoptosis in GBM cells and outlines Bcl-2 antagonism as a highly potent intervention to sensitize highly TRAIL-resistant GBM cells to TRAIL/TL32711 combination treatment.
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11
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Kumar S, Cieplak P. Effect of phosphorylation and single nucleotide polymorphisms on caspase substrates processing. Apoptosis 2018; 23:194-200. [DOI: 10.1007/s10495-018-1442-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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12
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Chuh KN, Batt AR, Zaro BW, Darabedian N, Marotta NP, Brennan CK, Amirhekmat A, Pratt MR. The New Chemical Reporter 6-Alkynyl-6-deoxy-GlcNAc Reveals O-GlcNAc Modification of the Apoptotic Caspases That Can Block the Cleavage/Activation of Caspase-8. J Am Chem Soc 2017; 139:7872-7885. [PMID: 28528544 PMCID: PMC6225779 DOI: 10.1021/jacs.7b02213] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
O-GlcNAc modification (O-GlcNAcylation) is required for survival in mammalian cells. Genetic and biochemical experiments have found that increased modification inhibits apoptosis in tissues and cell culture and that lowering O-GlcNAcylation induces cell death. However, the molecular mechanisms by which O-GlcNAcylation might inhibit apoptosis are still being elucidated. Here, we first synthesize a new metabolic chemical reporter, 6-Alkynyl-6-deoxy-GlcNAc (6AlkGlcNAc), for the identification of O-GlcNAc-modified proteins. Subsequent characterization of 6AlkGlcNAc shows that this probe is selectively incorporated into O-GlcNAcylated proteins over cell-surface glycoproteins. Using this probe, we discover that the apoptotic caspases are O-GlcNAcylated, which we confirmed using other techniques, raising the possibility that the modification affects their biochemistry. We then demonstrate that changes in the global levels of O-GlcNAcylation result in a converse change in the kinetics of caspase-8 activation during apoptosis. Finally, we show that caspase-8 is modified at residues that can block its cleavage/activation. Our results provide the first evidence that the caspases may be directly affected by O-GlcNAcylation as a potential antiapoptotic mechanism.
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Affiliation(s)
- Kelly N. Chuh
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744, United States
| | - Anna R. Batt
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744, United States
| | - Balyn W. Zaro
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744, United States
| | - Narek Darabedian
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744, United States
| | - Nicholas P. Marotta
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744, United States
| | - Caroline K. Brennan
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744, United States
| | - Arya Amirhekmat
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744, United States
| | - Matthew R. Pratt
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744, United States
- Department of Molecular and Computational Biology, University of Southern California, Los Angeles, California 90089-0744, United States
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13
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Yue J, Ben Messaoud N, López JM. Hyperosmotic Shock Engages Two Positive Feedback Loops through Caspase-3-dependent Proteolysis of JNK1-2 and Bid. J Biol Chem 2015; 290:30375-89. [PMID: 26511318 DOI: 10.1074/jbc.m115.660506] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Indexed: 01/07/2023] Open
Abstract
Hyperosmotic shock induces early calpain activation, Smac/DIABLO release from the mitochondria, and p38/JNK activation in Xenopus oocytes. These pathways regulate late cytochrome c release and caspase-3 activation. Here, we show that JNK1-1 and JNK1-2 are activated early by osmostress, and sustained activation of both isoforms accelerates the apoptotic program. When caspase-3 is activated, JNK1-2 is proteolyzed at Asp-385 increasing the release of cytochrome c and caspase-3 activity, thereby creating a positive feedback loop. Expression of Bcl-xL markedly reduces hyperosmotic shock-induced apoptosis. In contrast, expression of Bid induces rapid caspase-3 activation, even in the absence of osmostress, which is blocked by Bcl-xL co-expression. In these conditions a significant amount of Bid in the cytosol is mono- and bi-ubiquitinated. Caspase-3 activation by hyperosmotic shock induces proteolysis of Bid and mono-ubiquitinated Bid at Asp-52 increasing the release of cytochrome c and caspase-3 activation, and thus creating a second positive feedback loop. Revealing the JNK isoforms and the loops activated by osmostress could help to design better treatments for human diseases caused by perturbations in fluid osmolarity.
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Affiliation(s)
- Jicheng Yue
- From the Institut de Neurociències, Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica, Facultad de Medicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
| | - Nabil Ben Messaoud
- From the Institut de Neurociències, Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica, Facultad de Medicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
| | - José M López
- From the Institut de Neurociències, Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica, Facultad de Medicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
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Wang P, Lindsay J, Owens TW, Mularczyk EJ, Warwood S, Foster F, Streuli CH, Brennan K, Gilmore AP. Phosphorylation of the proapoptotic BH3-only protein bid primes mitochondria for apoptosis during mitotic arrest. Cell Rep 2014; 7:661-71. [PMID: 24767991 PMCID: PMC4022835 DOI: 10.1016/j.celrep.2014.03.050] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 02/12/2014] [Accepted: 03/20/2014] [Indexed: 01/07/2023] Open
Abstract
Mitosis is a moment of exquisite vulnerability for a metazoan cell. Failure to complete mitosis accurately can lead to aneuploidy and cancer initiation. Therefore, if the exit from mitosis is delayed, normal cells are usually removed by apoptosis. However, how failure to complete mitosis activates apoptosis is still unclear. Here, we demonstrate that a phosphorylated form of the BH3-only protein Bid regulates apoptosis if mitotic exit is delayed. Bid is phosphorylated on serine 66 as cells enter mitosis, and this phosphorylation is lost during the metaphase-to-anaphase transition. Cells expressing a nonphosphorylatable version of Bid or a BH3-domain mutant were resistant to mitotic-arrest-induced apoptosis. Thus, we show that Bid phosphorylation primes cells to undergo mitochondrial apoptosis if mitotic exit is delayed. Avoidance of this mechanism may explain the selective pressure for cancer cells to undergo mitotic slippage. Cell death in mitosis requires the BH3-only protein Bid Bid becomes phosphorylated on serine 66 as cells enter mitosis Bid phosphorylation makes mitotic cells dependent on antiapoptotic proteins Paclitaxel-insensitive cells can be sensitized by targeting this Bcl-2 checkpoint
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Affiliation(s)
- Pengbo Wang
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
| | - Jennefer Lindsay
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
| | - Thomas W Owens
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
| | - Ewa J Mularczyk
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
| | - Stacey Warwood
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
| | - Fiona Foster
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
| | - Charles H Streuli
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
| | - Keith Brennan
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
| | - Andrew P Gilmore
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK.
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15
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A functional genomics screen identifies PCAF and ADA3 as regulators of human granzyme B-mediated apoptosis and Bid cleavage. Cell Death Differ 2014; 21:748-60. [PMID: 24464226 DOI: 10.1038/cdd.2013.203] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 12/15/2013] [Accepted: 12/16/2013] [Indexed: 12/24/2022] Open
Abstract
The human lymphocyte toxins granzyme B (hGrzB) and perforin cooperatively induce apoptosis of virus-infected or transformed cells: perforin pores enable entry of the serine protease hGrzB into the cytosol, where it processes Bid to selectively activate the intrinsic apoptosis pathway. Truncated Bid (tBid) induces Bax/Bak-dependent mitochondrial outer membrane permeability and the release of cytochrome c and Smac/Diablo. To identify cellular proteins that regulate perforin/hGrzB-mediated Bid cleavage and subsequent apoptosis, we performed a gene-knockdown (KD) screen using a lentiviral pool of short hairpin RNAs embedded within a miR30 backbone (shRNAmiR). We transduced HeLa cells with a lentiviral pool expressing shRNAmiRs that target 1213 genes known to be involved in cell death signaling and selected cells with acquired resistance to perforin/hGrzB-mediated apoptosis. Twenty-two shRNAmiRs were identified in the positive-selection screen including two, PCAF and ADA3, whose gene products are known to reside in the same epigenetic regulatory complexes. Small interfering (si)RNA-mediated gene-KD of PCAF or ADA3 also conferred resistance to perforin/hGrzB-mediated apoptosis providing independent validation of the screen results. Mechanistically, PCAF and ADA3 exerted their pro-apoptotic effect upstream of mitochondrial membrane permeabilization, as indicated by reduced cytochrome c release in PCAF-KD cells exposed to perforin/hGrzB. While overall levels of Bid were unaltered, perforin/hGrzB-mediated cleavage of Bid was reduced in PCAF-KD or ADA3-KD cells. We discovered that PCAF-KD or ADA3-KD resulted in reduced expression of PACS2, a protein implicated in Bid trafficking to mitochondria and importantly, targeted PACS2-KD phenocopied the effect of PCAF-KD or ADA3-KD. We conclude that PCAF and ADA3 regulate Bid processing via PACS2, to modulate the mitochondrial cell death pathway in response to hGrzB.
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16
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Niemi NM, MacKeigan JP. Mitochondrial phosphorylation in apoptosis: flipping the death switch. Antioxid Redox Signal 2013; 19:572-82. [PMID: 23088365 PMCID: PMC3717198 DOI: 10.1089/ars.2012.4982] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
SIGNIFICANCE Apoptosis is a complex cellular process subject to multiple layers of regulation. One such layer of regulation includes post-translational modifications, including acetylation and phosphorylation. In particular, phosphorylation of proteins directly implicated in the apoptotic process has been extensively documented. Importantly, these phosphorylation events often have functional consequences, affecting the onset of apoptotic cell death. RECENT ADVANCES Large-scale proteomics studies have identified multiple novel phosphorylation sites on proteins involved in the apoptotic process. The delineation of the regulation and functional consequences of these phosphorylation events will be important in understanding the regulatory complexity of apoptosis. CRITICAL ISSUES Multiple mitochondrial-localized proteins involved in apoptosis are functionally affected by phosphorylation, which can ultimately dictate whether a cell lives or dies. The dynamic interplay between these phosphorylated proteins and their regulatory enzymes is critical for understanding the complex cellular decision to undergo apoptosis. FUTURE DIRECTIONS Detailed analysis of the kinetic and spatial regulation of phosphorylation events on apoptotic proteins, as well as how these dynamics influence the cell death process, will illuminate the complex interplay between the network of proteins that control the decision to undergo cell death.
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Affiliation(s)
- Natalie M Niemi
- Department of Systems Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503, USA
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Ginsenoside Rh2 induces human hepatoma cell apoptosisvia bax/bak triggered cytochrome C release and caspase-9/caspase-8 activation. Int J Mol Sci 2012; 13:15523-35. [PMID: 23443079 PMCID: PMC3546647 DOI: 10.3390/ijms131215523] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 11/13/2012] [Accepted: 11/15/2012] [Indexed: 01/11/2023] Open
Abstract
Ginsenoside Rh2 (G-Rh2) has been shown to induce apoptotic cell death in a variety of cancer cells. However, the details of the signal transduction cascade involved in G-Rh2-induced cell death is unclear. In this manuscript we elucidate the molecular mechanism of G-Rh2-induced apoptosis in human hepatoma SK-HEP-1 cells by demonstrating that G-Rh2 causes rapid and dramatic translocation of both Bak and Bax, which subsequently triggers mitochondrial cytochrome c release and consequent caspase activation. Interestingly, siRNA-based gene inactivation of caspase-8 effectively delays caspase-9 activation and apoptosis induced by G-Rh2, indicating that caspase-8 also plays an important role in the G-Rh2-induced apoptosis program. Taken together, our results indicate that G-Rh2 employs a multi pro-apoptotic pathway to execute cancer cell death, suggesting a potential role for G-Rh2 as a powerful chemotherapeutic agent.
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Dix MM, Simon GM, Wang C, Okerberg E, Patricelli MP, Cravatt BF. Functional interplay between caspase cleavage and phosphorylation sculpts the apoptotic proteome. Cell 2012; 150:426-40. [PMID: 22817901 DOI: 10.1016/j.cell.2012.05.040] [Citation(s) in RCA: 110] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Revised: 03/26/2012] [Accepted: 05/16/2012] [Indexed: 12/14/2022]
Abstract
Caspase proteases are principal mediators of apoptosis, where they cleave hundreds of proteins. Phosphorylation also plays an important role in apoptosis, although the extent to which proteolytic and phosphorylation pathways crosstalk during programmed cell death remains poorly understood. Using a quantitative proteomic platform that integrates phosphorylation sites into the topographical maps of proteins, we identify a cohort of over 500 apoptosis-specific phosphorylation events and show that they are enriched on cleaved proteins and clustered around sites of caspase proteolysis. We find that caspase cleavage can expose new sites for phosphorylation, and, conversely, that phosphorylation at the +3 position of cleavage sites can directly promote substrate proteolysis by caspase-8. This study provides a global portrait of the apoptotic phosphoproteome, revealing heretofore unrecognized forms of functional crosstalk between phosphorylation and caspase proteolytic pathways that lead to enhanced rates of protein cleavage and the unveiling of new sites for phosphorylation.
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Affiliation(s)
- Melissa M Dix
- The Skaggs Institute for Chemical Biology and Department of Chemical Physiology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA
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Uchibayashi R, Tsuruma K, Inokuchi Y, Shimazawa M, Hara H. Involvement of Bid and caspase-2 in endoplasmic reticulum stress- and oxidative stress-induced retinal ganglion cell death. J Neurosci Res 2011; 89:1783-94. [DOI: 10.1002/jnr.22691] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 04/12/2011] [Accepted: 04/14/2011] [Indexed: 12/22/2022]
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Novel Anticancer Platinum(IV) Complexes with Adamantylamine: Their Efficiency and Innovative Chemotherapy Strategies Modifying Lipid Metabolism. Met Based Drugs 2011; 2008:417897. [PMID: 18414587 PMCID: PMC2291354 DOI: 10.1155/2008/417897] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Revised: 10/08/2007] [Accepted: 10/18/2007] [Indexed: 11/18/2022] Open
Abstract
The impressive impact of cisplatin on cancer on one side and severe side effects, as well as the development of drug resistance during treatment on the other side, were the factors motivating scientists to design and synthesize new more potent analogues lacking disadvantages of cisplatin. Platinum(IV) complexes represent one of the perspective groups of platinum-based drugs. In this review, we summarize recent findings on both in vitro and in vivo effects of platinum(IV) complexes with adamantylamine. Based on a literary overview of the mechanisms of activity of platinum-based cytostatics, we discuss opportunities for modulating the effects of novel platinum complexes through interactions with apoptotic signaling pathways and with cellular lipids, including modulations of the mitochondrial cell death pathway, oxidative stress, signaling of death ligands, lipid metabolism/signaling, or intercellular communication. These approaches might significantly enhance the efficacy of both novel and established platinum-based cytostatics.
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Moffitt KL, Martin SL, Walker B. From sentencing to execution – the processes of apoptosis. J Pharm Pharmacol 2010; 62:547-62. [DOI: 10.1211/jpp.62.05.0001] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Hellwig CT, Ludwig-Galezowska AH, Concannon CG, Litchfield DW, Prehn JHM, Rehm M. Activity of protein kinase CK2 uncouples Bid cleavage from caspase-8 activation. J Cell Sci 2010; 123:1401-6. [PMID: 20356928 DOI: 10.1242/jcs.061143] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
In the present study, we quantitatively analysed the interface between apoptosis initiation and execution by determining caspase-8 activation, Bid cleavage and mitochondrial engagement (onset of mitochondrial depolarisation) in individual HeLa cervical cancer cells following exposure to tumour-necrosis-factor-related apoptosis-inducing ligand (TRAIL). Employing resonance-energy-transfer probes containing either the caspase-8 recognition site IETD or full-length Bid, we observed a significant delay between the times of caspase-8 activation and Bid cleavage, suggesting the existence of control steps separating these two processes. Subsequent analyses suggested that the divergence of caspase-8 activation and Bid cleavage are critically controlled by kinase signalling: inhibiting protein kinase CK2 by using 5,6-dichloro-l-(beta-D-ribofuranosyl-1)-benzimidazole (DRB) or by overexpression of a dominant-negative CK2alpha catalytic subunit largely eliminated the lag time between caspase-8 activation and Bid cleavage. We conclude that caspase-8 activation and Bid cleavage are temporally uncoupled events, providing transient tolerance to caspase-8 activities.
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Affiliation(s)
- Christian T Hellwig
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, RCSI York House, York Street, Dublin 2, Ireland
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23
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García S, Liz M, Gómez-Reino JJ, Conde C. Akt activity protects rheumatoid synovial fibroblasts from Fas-induced apoptosis by inhibition of Bid cleavage. Arthritis Res Ther 2010; 12:R33. [PMID: 20187936 PMCID: PMC2875667 DOI: 10.1186/ar2941] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Revised: 02/18/2010] [Accepted: 02/26/2010] [Indexed: 01/11/2023] Open
Abstract
Introduction Synovial hyperplasia is a main feature of rheumatoid arthritis pathology that leads to cartilage and bone damage in the inflamed joints. Impaired apoptosis of resident synoviocytes is pivotal in this process. Apoptosis resistance seems to involve defects in the extrinsic and intrinsic apoptotic pathways. The aim of this study was to investigate the association of PI3Kinase/Akt and the mitochondrial apoptotic pathway in the resistance of rheumatoid arthritis (RA) fibroblast like synovial cells (FLS) to Fas-mediated apoptosis. Methods Apoptosis was assessed by ELISA quantification of nucleosomal release, Hoechst staining and activated caspase-3/7 measure in cultured RA FLS stimulated with anti-Fas antibody. Two Phosphoinositol-3-kinase/protein Kinase B (PI3 Kinase) inhibitors, Wortmannine and LY294002, were used before anti-Fas stimulation. Proapoptotic BH3 interacting domain death agonist (Bid) was suppressed in RA FLS by small interfering RNA (siRNA) transfection. Bid was overexpressed by transfection with the pDsRed2-Bid vector. Phosphorylated Akt, caspase-9, and Bid expression were analysed by western blot. Results PI3 kinase inhibition sensitizes RA FLS to Fas-induced apoptosis by increasing cleavage of Bid protein. Bid suppression completely abrogated Fas-induced apoptosis and Bid overexpression highly increased apoptotic rate of RA FLS in association with cleavage of caspase-9. Conclusions In RA FLS, phosphorylation of Akt protects against Fas-induced apoptosis through inhibition of Bid cleavage. The connection between the extrinsic and the intrinsic apoptotic pathways are critical in this Fas- mediated apoptosis and points to PI3Kinase as potential therapeutic target for RA.
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Affiliation(s)
- Samuel García
- Research Laboratory and Rheumatology Unit, Hospital Clínico Universitario, Choupana s/n, Santiago de Compostela, 15706-Spain.
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Azakir BA, Desrochers G, Angers A. The ubiquitin ligase Itch mediates the antiapoptotic activity of epidermal growth factor by promoting the ubiquitylation and degradation of the truncated C-terminal portion of Bid. FEBS J 2010; 277:1319-30. [DOI: 10.1111/j.1742-4658.2010.07562.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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25
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Schüngel S, Buitrago-Molina LE, Nalapareddy P, Lebofsky M, Manns MP, Jaeschke H, Gross A, Vogel A. The strength of the Fas ligand signal determines whether hepatocytes act as type 1 or type 2 cells in murine livers. Hepatology 2009; 50:1558-66. [PMID: 19711425 PMCID: PMC2905662 DOI: 10.1002/hep.23176] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
UNLABELLED The BH3-interacting domain death agonist Bid has been shown to be critical for Fas-induced hepatocellular apoptosis. Furthermore, some studies have suggested that phosphorylation of Bid may determine its apoptotic function and may act as a switch to nonapoptotic functions. The aim of this study was to evaluate the role of Bid and phosphorylated Bid for Fas ligand (FasL)-induced apoptosis in murine livers. The monoclonal antibody Jo2 and a hexameric form of sFasL (MegaFasL) were used to induce apoptosis in wild-type, Bid-deficient (Bid(-/-)), Bid transgenic mice expressing a nonphosphorable form of Bid and Fas receptor-deficient lpr mice. Apoptosis sensitivity was determined in healthy mice and in mice following bile duct ligation, partial hepatectomy, or suramin pretreatment. As previously reported, loss of Bid protects mice against Jo2-induced liver failure. Remarkably however, Bid(-/-) mice are highly sensitive to MegaFasL-induced apoptosis. MegaFasL-treated Bid(-/-) mice showed a typical type I cell signaling behavior with activation of caspase-3 without Bax translocation to the mitochondria and no cytochrome C/Smac release into the cytosol. In contrast to previous in vitro findings, phosphorylation of Bid does not affect the sensitivity of hepatocytes to Fas receptor-mediated apoptosis in vivo. CONCLUSION Our data suggest that Bid mainly amplifies a weak death receptor signal in quiescent and nonquiescent hepatocytes rendering the liver more sensitive to FasL-induced apoptosis. Thus, depending on the efficacy of Fas receptor activation, hepatocytes and nonparenchymal cells can either behave as type I or type II cells.
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Affiliation(s)
- Sven Schüngel
- Clinic of Hepatology, Gastroenterology and Endocrinology, Medical School Hannover, Hannover, Germany
| | | | - Padmavathi Nalapareddy
- Clinic of Hepatology, Gastroenterology and Endocrinology, Medical School Hannover, Hannover, Germany
| | - Margitta Lebofsky
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Michael P. Manns
- Clinic of Hepatology, Gastroenterology and Endocrinology, Medical School Hannover, Hannover, Germany
| | - Hartmut Jaeschke
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Atan Gross
- Department of Biological Regulation, Weizmann Institute of Science, Rehovot, Israel
| | - Arndt Vogel
- Clinic of Hepatology, Gastroenterology and Endocrinology, Medical School Hannover, Hannover, Germany
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Abstract
Bid, a pro-apoptotic member of the Bcl-2 family, was initially discovered through binding to both pro-apoptotic Bax and anti-apoptotic Bcl-2. During apoptosis, Bid can be cleaved not only by caspase-8 during death receptor apoptotic signaling, but also by other caspases, granzyme B, calpains and cathepsins. Protease-cleaved Bid migrates to mitochondria where it induces permeabilization of the outer mitochondrial membrane that is dependent on the pro-apoptotic proteins Bax and/or Bak, and thus Bid acts as a sentinel for protease-mediated death signals. Although sequence analysis suggests that Bid belongs to the BH3-only subgroup of the Bcl-2 family, structural and phylogenetic analysis suggests that Bid may be more related to multi-BH region proteins such as pro-apoptotic Bax. Analysis of membrane binding by protease-cleaved Bid reveals mechanistic similarities with the membrane binding of Bax. For both proteins, membrane binding is characterized by relief of N-terminal inhibition of sequences promoting migration to membranes, insertion into the bilayer of the central hydrophobic hairpin helices and exposure of the BH3 region. These findings implicate Bid as a BH3-only protein that is both structurally and functionally related to multi-BH region Bcl-2 family proteins such as Bax.
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Biochemical characterization of bovine brain myristoyl-CoA:protein N-myristoyltransferase type 2. J Biomed Biotechnol 2009; 2009:907614. [PMID: 19746168 PMCID: PMC2737134 DOI: 10.1155/2009/907614] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2009] [Revised: 06/09/2009] [Accepted: 06/15/2009] [Indexed: 11/18/2022] Open
Abstract
Protein N-myristoylation is a lipidic modification which refers to the covalent attachment of myristate, a 14-carbon saturated fatty acid, to the N-terminal glycine residue of a number of mammalian, viral, and fungal proteins. In this paper, we have cloned the gene coding for myristoyl-CoA:protein N-myristoyltransferase (NMT) from Bos tarus brain. The open reading frame codes for a 410-amino-acid protein and overexpressed in Escherichia coli. Kinetic studies suggested that bovine brain NMT2 and human NMT1 show significant differences in their peptide substrate specificities. The metal ion Ca(2+) had stimulatory effects on NMT2 activity while Mn(2+) and Zn(2+) inhibited the enzyme activity. In addition, NMT2 activity was inhibited by various organic solvents and other detergents while NMT1 had a stimulatory effect. Biochemical characterization suggested that both forms of NMT have unique characteristics. Further analysis towards functional role NMT2 will lead the development of therapeutic target for the progression of various diseases such as cancer, cardiovascular diseases, and neurodegenerative diseases.
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Dieterle A, Orth R, Daubrawa M, Grotemeier A, Alers S, Ullrich S, Lammers R, Wesselborg S, Stork B. The Akt inhibitor triciribine sensitizes prostate carcinoma cells to TRAIL-induced apoptosis. Int J Cancer 2009; 125:932-41. [PMID: 19422047 DOI: 10.1002/ijc.24374] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Aberrant PI3K/Akt signaling has been implicated in many human cancers, including prostate carcinomas. Currently different therapeutic strategies target the inhibition of this survival pathway. The nucleoside analog triciribine (TCN), which was initially described as a DNA synthesis inhibitor, has recently been shown to function as an inhibitor of Akt. Here, we demonstrate that TCN inhibits Akt phosphorylation at Thr308 and Ser473 and Akt activity in the human prostate cancer cell line PC-3. In addition, TCN sensitized PC-3 cells to TRAIL- and anti-CD95-induced apoptosis, whereas the cells remained resistant to DNA damaging chemotherapeutics. The observed sensitization essentially depended on the phosphorylation status of Akt. Thus, prostate cancer cell lines displaying constitutively active Akt, e.g. PC-3 or LNCaP, were sensitized to death receptor-induced apoptosis. Most importantly with respect to therapeutic application, derivatives of both TCN and TRAIL are already tested in current clinical trials. Therefore, this combinatorial treatment might open a promising therapeutic approach for the elimination of hormone-refractory prostate cancers, which are largely resistant to conventional DNA damaging anticancer drugs or irradiation.
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Affiliation(s)
- Alexandra Dieterle
- Department of Internal Medicine I, University of Tübingen, Tübingen, Germany
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29
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Abstract
Apoptosis proceeds through a set of evolutionarily conserved processes that co-ordinate the elimination of damaged or unneeded cells. This program of cell death is carried out by organelle-directed regulators, including the Bcl-2 proteins, and ultimately executed by proteases of the caspase family. Although the biochemical mechanisms of apoptosis are increasingly understood, the underlying cell biology orchestrating programmed cell death remains enigmatic. In this review, we summarize the current understanding of Bcl-2 protein regulation and caspase activation while examining cell biological mechanisms and consequences of apoptotic induction. Organellar contributions to apoptotic induction include death receptor endocytosis, mitochondrial and lysosomal permeabilization, endoplasmic reticulum calcium release and fragmentation of the Golgi apparatus. These early apoptotic events are accompanied by stabilization of the microtubule cytoskeleton and translocation of organelles to the microtubule organizing center. Together, these phenomena establish a model of apoptotic induction whereby a cytoskeletal-dependent coalescence and 'scrambling' of organelles in the paranuclear region co-ordinates apoptotic communication, caspase activation and cell death.
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Affiliation(s)
- Joseph E Aslan
- Vollum Institute, Oregon Health & Science University, Portland, OR 97239, USA
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30
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Manara A, Lindsay J, Marchioretto M, Astegno A, Gilmore AP, Esposti MD, Crimi M. Bid binding to negatively charged phospholipids may not be required for its pro-apoptotic activity in vivo. Biochim Biophys Acta Mol Cell Biol Lipids 2009; 1791:997-1010. [PMID: 19463967 DOI: 10.1016/j.bbalip.2009.05.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Revised: 05/08/2009] [Accepted: 05/13/2009] [Indexed: 01/07/2023]
Abstract
Bid is a ubiquitous pro-apoptotic member of the Bcl-2 family that has been involved in a variety of pathways of cell death. Unique among pro-apoptotic proteins, Bid is activated after cleavage by the apical caspases of the extrinsic pathway; subsequently it moves to mitochondria, where it promotes the release of apoptogenic proteins in concert with other Bcl-2 family proteins like Bak. Diverse factors appear to modulate the pro-apoptotic action of Bid, from its avid binding to mitochondrial lipids (in particular, cardiolipin) to multiple phosphorylations at sites that can modulate its caspase cleavage. This work addresses the question of how the lipid interactions of Bid that are evident in vitro actually impact on its pro-apoptotic action within cells. Using site-directed mutagenesis, we identified mutations that reduced mouse Bid lipid binding in vitro. Mutation of the conserved residue Lys157 specifically decreased the binding to negatively charged lipids related to cardiolipin and additionally affected the rate of caspase cleavage. However, this lipid-binding mutant had no discernable effect on Bid pro-apoptotic function in vivo. The results are interpreted in relation to an underlying interaction of Bid with lysophosphatidylcholine, which is not disrupted in any mutant retaining pro-apoptotic function both in vitro and in vivo.
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Affiliation(s)
- Anna Manara
- Department of Biotechnology, University of Verona, Strada le Grazie 15, 37134 Verona, Italy
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Rehm M, Huber HJ, Hellwig CT, Anguissola S, Dussmann H, Prehn JHM. Dynamics of outer mitochondrial membrane permeabilization during apoptosis. Cell Death Differ 2009; 16:613-23. [PMID: 19136937 DOI: 10.1038/cdd.2008.187] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Individual cells within a population undergo apoptosis at distinct, apparently random time points. By analyzing cellular mitotic history, we identified that sibling HeLa cell pairs, in contrast to random cell pairs, underwent apoptosis synchronously. This allowed us to use high-speed cellular imaging to investigate mitochondrial outer membrane permeabilization (MOMP), a highly coordinated, rapid process during apoptosis, at a temporal resolution approximately 100 times higher than possible previously. We obtained new functional and mechanistic insight into the process of MOMP: We were able to determine the kinetics of pore formation in the outer mitochondrial membrane from the initiation phase of cytochrome-c-GFP redistribution, and showed differential pore formation kinetics in response to intrinsic or extrinsic apoptotic stimuli (staurosporine, tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)). We also detected that the onset of mitochondrial permeabilization frequently proceeded as a wave through the cytosol, and that the frequency of wave occurrence in response to TRAIL was reduced by inhibition of protein kinase CK2. Computational analysis by a partial differential equation model suggested that the spread of permeabilization signals could sufficiently be explained by diffusion-adsorption velocities of locally generated permeabilization inducers. Taken together, our study yielded the first comprehensive analysis of clonal cell-to-cell variability in apoptosis execution and allowed to visualize and explain the dynamics of MOMP in cells undergoing apoptosis.
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Affiliation(s)
- M Rehm
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin 2, Ireland.
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Walter D, Schmich K, Vogel S, Pick R, Kaufmann T, Hochmuth FC, Haber A, Neubert K, McNelly S, von Weizsäcker F, Merfort I, Maurer U, Strasser A, Borner C. Switch from type II to I Fas/CD95 death signaling on in vitro culturing of primary hepatocytes. Hepatology 2008; 48:1942-53. [PMID: 19003879 PMCID: PMC2993691 DOI: 10.1002/hep.22541] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
UNLABELLED Fas/CD95-induced apoptosis of hepatocytes in vivo proceeds through the so-called type II pathway, requiring the proapoptotic BH3-only Bcl-2 family member Bid for mitochondrial death signaling. Consequently, Bid-deficient mice are protected from anti-Fas antibody injection induced fatal hepatitis. We report the unexpected finding that freshly isolated mouse hepatocytes, cultured on collagen or Matrigel, become independent of Bid for Fas-induced apoptosis, thereby switching death signaling from type II to type I. In such in vitro cultures, Fas ligand (FasL) activates caspase-3 without Bid cleavage, Bax/Bak activation or cytochrome c release, and neither Bid ablation nor Bcl-2 overexpression is protective. The type II to type I switch depends on extracellular matrix adhesion, as primary hepatocytes in suspension die in a Bid-dependent manner. Moreover, the switch is specific for FasL-induced apoptosis as collagen-plated Bid-deficient hepatocytes are protected from tumor necrosis factor alpha/actinomycin D (TNFalpha/ActD)-induced apoptosis. CONCLUSION Our data suggest a selective crosstalk between extracellular matrix and Fas-mediated signaling that favors mitochondria-independent type I apoptosis induction.
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Affiliation(s)
- Dorothée Walter
- Institute of Molecular Medicine and Cell Research, Centre of Biochemistry and Molecular Research (ZBMZ), Albert Ludwigs University Freiburg, Stefan Meier Strasse 17, D-79104 Freiburg, Germany,Faculty of Biology, Albert Ludwigs University Freiburg
| | - Kathrin Schmich
- Department of Pharmaceutical Biology and Biotechnology, Stefan Meier Str. 19, Albert Ludwigs University Freiburg, D-79104 Freiburg
| | - Sandra Vogel
- Institute of Molecular Medicine and Cell Research, Centre of Biochemistry and Molecular Research (ZBMZ), Albert Ludwigs University Freiburg, Stefan Meier Strasse 17, D-79104 Freiburg, Germany,Faculty of Biology, Albert Ludwigs University Freiburg,Spemann Graduate School of Biology and Medicine (SGBM), Albertstrasse 19a, Albert Ludwigs University Freiburg, D-79104 Freiburg
| | - Robert Pick
- Institute of Molecular Medicine and Cell Research, Centre of Biochemistry and Molecular Research (ZBMZ), Albert Ludwigs University Freiburg, Stefan Meier Strasse 17, D-79104 Freiburg, Germany
| | - Thomas Kaufmann
- The Walter and Eliza Hall Institute Medical Research, Parkville, VIC 3050, Australia
| | - Florian Christoph Hochmuth
- Institute of Molecular Medicine and Cell Research, Centre of Biochemistry and Molecular Research (ZBMZ), Albert Ludwigs University Freiburg, Stefan Meier Strasse 17, D-79104 Freiburg, Germany
| | - Angelika Haber
- Institute of Molecular Medicine and Cell Research, Centre of Biochemistry and Molecular Research (ZBMZ), Albert Ludwigs University Freiburg, Stefan Meier Strasse 17, D-79104 Freiburg, Germany
| | - Karin Neubert
- Institute of Molecular Medicine and Cell Research, Centre of Biochemistry and Molecular Research (ZBMZ), Albert Ludwigs University Freiburg, Stefan Meier Strasse 17, D-79104 Freiburg, Germany
| | - Sabine McNelly
- Internal Medicine, University Clinic Freiburg, Hugstetterstrasse 55, D-79106 Freiburg
| | - Fritz von Weizsäcker
- Internal Medicine, University Clinic Freiburg, Hugstetterstrasse 55, D-79106 Freiburg
| | - Irmgard Merfort
- Department of Pharmaceutical Biology and Biotechnology, Stefan Meier Str. 19, Albert Ludwigs University Freiburg, D-79104 Freiburg
| | - Ulrich Maurer
- Institute of Molecular Medicine and Cell Research, Centre of Biochemistry and Molecular Research (ZBMZ), Albert Ludwigs University Freiburg, Stefan Meier Strasse 17, D-79104 Freiburg, Germany
| | - Andreas Strasser
- The Walter and Eliza Hall Institute Medical Research, Parkville, VIC 3050, Australia
| | - Christoph Borner
- Institute of Molecular Medicine and Cell Research, Centre of Biochemistry and Molecular Research (ZBMZ), Albert Ludwigs University Freiburg, Stefan Meier Strasse 17, D-79104 Freiburg, Germany,Department of Pharmaceutical Biology and Biotechnology, Stefan Meier Str. 19, Albert Ludwigs University Freiburg, D-79104 Freiburg,To whom correspondence should be addressed:
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Hellwig CT, Kohler BF, Lehtivarjo AK, Dussmann H, Courtney MJ, Prehn JHM, Rehm M. Real time analysis of tumor necrosis factor-related apoptosis-inducing ligand/cycloheximide-induced caspase activities during apoptosis initiation. J Biol Chem 2008; 283:21676-85. [PMID: 18522940 DOI: 10.1074/jbc.m802889200] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Employing fluorescence resonance energy transfer (FRET) imaging, we previously demonstrated that effector caspase activation is often an all-or-none response independent of drug choice or dose administered. We here investigated the signaling dynamics during apoptosis initiation via the tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) receptor pathway to investigate how variability in drug exposure can be translated into largely kinetically invariant cell death execution pathways. FRET-based microscopy demonstrated dose-dependent responses of caspase-8 activation and activity within individual living HeLa cells. Caspase-8 on average was activated 45-600 min after TRAIL/cycloheximide addition. Caspase-8-like activities persisted for 15-60 min before eventually inducing mitochondrial outer membrane permeabilization. Independent of the TRAIL concentrations used or the resulting caspase-8-like activities, mitochondrial outer membrane permeabilization was induced when 10% of the FRET substrate was cleaved. In contrast, in Bid-depleted cells, caspase-8-like activity persisted for hours without causing immediate cell death. Our findings provide detailed insight into the intracellular signaling kinetics during apoptosis initiation and describe a threshold mechanism controlling the induction of apoptosis execution.
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Affiliation(s)
- Christian T Hellwig
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, RCSI York House, York Street, Dublin 2, Ireland
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Melatonin receptors, heterodimerization, signal transduction and binding sites: what's new? Br J Pharmacol 2008; 154:1182-95. [PMID: 18493248 DOI: 10.1038/bjp.2008.184] [Citation(s) in RCA: 219] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Melatonin is a neurohormone that has been claimed to be involved in a wide range of physiological functions. Nevertheless, for most of its effects, the mechanism of action is not really known. In mammals, two melatonin receptors, MT1 and MT2, have been cloned. They belong to the G-protein-coupled receptor (GPCR) superfamily. They share some specific short amino-acid sequences, which suggest that they represent a specific subfamily. Another receptor from the same subfamily, the melatonin-related receptor has been cloned in different species including humans. This orphan receptor also named GPR50 does not bind melatonin and its endogenous ligand is still unknown. Nevertheless, this receptor has been shown to behave as an antagonist of the MT1 receptor, which opens new pharmacological perspectives for GPR50 despite the lack of endogenous or synthetic ligands. Moreover, MT1 and MT2 interact together through the formation of heterodimers at least in cells transfected with the cDNA of these two receptors. Lastly, signalling complexes associated with MT1 and MT2 receptors are starting to be deciphered. A third melatonin-binding site has been purified and characterized as the enzyme quinone reductase 2 (QR2). Inhibition of QR2 by melatonin may explain melatonin's protective effect that has been reported in different animal models and that is generally associated with its well-documented antioxidant properties.
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Falschlehner C, Emmerich CH, Gerlach B, Walczak H. TRAIL signalling: decisions between life and death. Int J Biochem Cell Biol 2007; 39:1462-75. [PMID: 17403612 DOI: 10.1016/j.biocel.2007.02.007] [Citation(s) in RCA: 340] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2006] [Revised: 02/02/2007] [Accepted: 02/05/2007] [Indexed: 12/20/2022]
Abstract
The TNF-related apoptosis-inducing ligand, TRAIL, has been shown to selectively kill tumour cells. This property has made TRAIL and agonistic antibodies against its death inducing receptors (TRAIL-R1 and TRAIL-R2) to some of the most promising novel biotherapeutic agents for cancer therapy. Here we review the signalling pathways initiated by the apoptosis- as well as the non-apoptosis-inducing receptors, TRAIL-R3 and TRAIL-R4. The TRAIL "death-inducing signalling complex" (DISC) transmits the apoptotic signal. DISC formation leads to activation of a protease cascade, finally resulting in cell death. The TRAIL death receptor-mediated "extrinsic" pathway and the "intrinsic" pathway, which is controlled by the interaction of members of the Bcl-2 family, interact with each other in the decision about life or death of a cell. Apoptotic and non-apoptotic signalling is influenced by the NF-kappaB, PKB/Akt and the MAPK signalling pathways. In this review we intend to summarise the most important findings on the TRAIL signalling network and the interplay in the decisions between life and death of a tumor cell.
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Affiliation(s)
- Christina Falschlehner
- Division of Apoptosis Regulation (D040), Tumor Immunology Program, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120 Heidelberg, Germany
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Okoumassoun LE, Russo C, Denizeau F, Averill-Bates D, Henderson JE. Parathyroid hormone-related protein (PTHrP) inhibits mitochondrial-dependent apoptosis through CK2. J Cell Physiol 2007; 212:591-9. [PMID: 17443683 DOI: 10.1002/jcp.21055] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Over the past decade, parathyroid hormone-related protein (PTHrP) has been identified as a key survival factor for cells subjected to apoptotic stimuli. Its anti-apoptotic activity has been attributed to nuclear accumulation of the intact protein, or a synthetic peptide corresponding to its nuclear targeting sequence (NTS), which promotes rapid exit of nutrient deprived cells from the cell cycle. Intracellular PTHrP also inhibited apoptosis by blocking tumor necrosis factor alpha (TNFalpha)-induced apoptosis by blocking signaling from the "death receptor" and preventing damage to the mitochondrial membrane. In both cases, the anti-apoptotic activity was significantly reduced in the presence of a nuclear deficient form of PTHrP with a (88)K/E K/E.K/I(91) mutation in the NTS. The current work was undertaken to determine the mechanism by which nuclear PTHrP blocked mitochondrial-mediated apoptosis. Using sub-cellular fractionation and functional assays we showed that pre-treatment of HEK293 cells with exogenous NTS peptide before inducing apoptosis with TNFalpha was as effective as expression of the full-length protein in inhibiting apoptosis. Inhibition of apoptosis was associated with increased expression of protein kinase casein kinase 2 (CK2) and in sustained CK2 accumulation and activity in the nuclear fraction. In primary chondrogenic cells harvested from the limb buds of PTHrP(+/-) and PTHrP(-/-) embryonic mice, there was a dose-dependent decrease in CK2 expression and activity that correlated with increased susceptibility to apoptosis. Taken together the results indicate that nuclear accumulation of PTHrP effectively inhibits mitochondrial-mediated apoptosis through regulation of the expression, activity, and sub-cellular trafficking of CK2.
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Wang X, Narayanan M, Bruey JM, Rigamonti D, Cattaneo E, Reed JC, Friedlander RM. Protective role of Cop in Rip2/caspase-1/caspase-4-mediated HeLa cell death. Biochim Biophys Acta Mol Basis Dis 2006; 1762:742-54. [PMID: 16920334 DOI: 10.1016/j.bbadis.2006.06.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2006] [Revised: 06/20/2006] [Accepted: 06/21/2006] [Indexed: 10/24/2022]
Abstract
CARD only protein (Cop) was recently identified as a protein with significant homology with the CARD of caspase-1. We have conducted functional studies on Cop and report on its role as an inhibitor of cell death in a broad range of cell death paradigms. A notable exception in the ability of Cop to inhibit cell death pertains to its inability to inhibit ER stress-mediated cell death. Furthermore, in addition to the known interaction of Cop and caspase-1, we demonstrated a novel interaction of Cop with caspase-4. We propose that Cop's action to prevent TNF-alpha-induced cell death may operate independently of the mitochondrial death pathway. Furthermore, Cop overexpression inhibits Bid cleavage. In summary, Cop inhibition of cell death, at least to a certain extent, results from its interference with the activation of caspase-1 and caspase-4. Understanding the mechanistic details modulating caspase cell death pathways should provide important information for the development of therapies for diseases featuring aberrant caspase activation. Cop, as an inhibitor of an important apical caspase cell death axis, may provide a tool for modulating pathological cell death.
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Affiliation(s)
- Xin Wang
- Neuroapoptosis Laboratory, Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, LMRC 123, Boston, MA 02115, USA
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Goyeneche AA, Harmon JM, Telleria CM. Cell death induced by serum deprivation in luteal cells involves the intrinsic pathway of apoptosis. Reproduction 2006; 131:103-11. [PMID: 16388014 DOI: 10.1530/rep.1.00751] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The corpus luteum is a transient endocrine gland specializing in the production of progesterone. The regression of the corpus luteum involves an abrupt decline in its capacity for producing progesterone followed by its structural involution, which is associated with apoptosis of the luteal cells. An in vitro experimental approach is needed to study the molecular mechanisms underlying hormonal regulation of luteal cell death under defined experimental conditions. In this study, we investigated simian virus-40-transformed luteal cells to determine whether they can be driven to apoptosis and, if so, to define the intracellular pathway involved. Luteal cells were cultured in the presence or absence of fetal bovine serum for 24 or 48 h. Under serum starvation conditions, the luteal cells underwent growth arrest accompanied by cell death as evaluated by dye exclusion, and confirmed by two-color fluorescence cell viability/cytotoxicity assay. We next studied whether serum starvation-induced death of luteal cells occurred by apoptosis. Morphologic features of apoptosis were observed in cells stained with hematoxylin after being subjected to serum starvation for 48 h. The apoptotic nature was further confirmed by in situ 3'-end labeling and fragmentation of genomic DNA. Apoptosis of serum-deprived luteal cells was dependent upon caspase activation. Serum starvation induced cleavage of poly (ADP-ribose) polymerase (PARP), suggesting that caspase-3 had been activated under the stress of withdrawal of growth factors. This was confirmed by cleavage of full-length procaspase-3. Finally, the fact that serum starvation promoted the cleavage of full-length procaspase-9 and the decrease in the expression of endogenous Bid, a BH-3-only proapoptotic protein of the Bcl-2 family, indicates that the intrinsic (i.e., mitochondrial) pathway of apoptosis was activated. In summary, we have characterized an in vitro experimental model of luteal cell death that can be utilized to evaluate the role of hormones in apoptosis of luteal cells under defined culture conditions, and to study the mechanism of luteal regression.
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Affiliation(s)
- Alicia A Goyeneche
- Division of Basic Biomedical Sciences, University of South Dakota School of Medicine, 414 East Clark Street, Vermillion, 57069, USA
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Fukunaga K, Han F, Shioda N, Moriguchi S, Kasahara J, Shirasaki Y. DY-9760e, a Novel Calmodulin Inhibitor, Exhibits Cardioprotective Effects in the Ischemic Heart. ACTA ACUST UNITED AC 2006; 24:88-100. [PMID: 16961723 DOI: 10.1111/j.1527-3466.2006.00088.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
DY-9760e (3-[2-[4-(3-chloro-2-methylphenyl)-1-piperazinyl]ethyl]-5,6-dimethoxy-1-(4-imidazolylmethyl)-1H-indazole dihydrochloride-3.5 hydrate) inhibits Ca(2+)/CaM-dependent nitric oxide synthase (NOS), thereby inhibiting nitric oxide (NO) production. In cardiomyocytes from ischemic rat heart NO and superoxide levels are increased causing protein tyrosine nitration. In hearts subjected to ischemia/reperfusion DY-9760e totally abolishes protein tyrosine nitration. Notably, DY-9760e also inhibits calpain and cas-pase-3 activation that occurs prior to apoptosis in cardiomyocytes. In ischemic hearts fodrin is the substrate for calpain. DY-9760e inhibits fodrin breakdown in the peri-infarct area rather than in the infarct core. In the ischemic rat brain DY-9760e inhibits caspase-3-induced proteolysis of calpastatin, an endogenous calpain inhibitor, suggesting that crosstalk between calpain and caspase-3 is mediated by calpastatin breakdown. Thus, DY-9760e rescues neurons and cardiomyocytes from ischemic injury by inhibiting crosstalk between calpain and caspase-3 as well as protein tyrosine nitration.
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Affiliation(s)
- Kohji Fukunaga
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan.
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41
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Abstract
BCL-2 family members are pivotal regulators of the apoptotic process. Mitochondria are a major site-of-action for these proteins. Several prominent alterations occur to mitochondria during apoptosis that seem to be part of the "mitochondrial apoptotic program." The BCL-2 family members are believed to be the major regulators of this program, however their exact mechanism of action still remains a mystery. BID, a pro-apoptotic BCL-2 family member plays an essential role in initiating this program. Recently, we have revealed that in apoptotic cells the activated/truncated form of BID, tBID, interacts with a novel, uncharacterized protein named mitochondrial carrier homolog 2 (Mtch2). Mtch2 is a conserved protein that is similar to members of the mitochondrial carrier protein (MCP) family. This review summarizes the current knowledge regarding BCL-2 family members and the mitochondrial apoptotic program and examines the possible involvement of Mtch2 in this program.
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Affiliation(s)
- Atan Gross
- Department of Biological Regulation, Weizmann Institute of Science, Rehovot, 76100, Israel.
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Yin XM. Bid, a BH3-only multi-functional molecule, is at the cross road of life and death. Gene 2006; 369:7-19. [PMID: 16446060 DOI: 10.1016/j.gene.2005.10.038] [Citation(s) in RCA: 145] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2005] [Revised: 10/25/2005] [Accepted: 10/26/2005] [Indexed: 12/22/2022]
Abstract
Bid, BH3-interacting domain death agonist, was initially cloned based in its ability to interact with both Bcl-2 and Bax. Bid contains only the BH3 domain, which is required for its interaction with the Bcl-2 family proteins and for its pro-death activity. Bid is susceptible to proteolytic cleavage by caspases, calpains, Granzyme B and cathepsins. Bid is important to cell death mediated by these proteases and thus is the sentinel to protease-mediated death signals. Protease-cleaved Bid is able to induce multiple mitochondrial dysfunctions, including the release of the inter-membrane space proteins, cristae reorganization, depolarization, permeability transition and generation of reactive oxygen species. Thus Bid is the molecular linker bridging various peripheral death pathways to the central mitochondria pathway. Recent studies further indicate that Bid may be more than just a killer molecule. Deletion of Bid inhibits carcinogenesis in the liver, although this genetic alteration promotes tumorigenesis in the myeloid cells. This is likely related to the function of Bid to promote cell cycle progression into S phase. Bid could be also involved in the maintenance of genomic stability by engaging at mitosis checkpoint. These novel findings indicate that this BH3-only Bcl-2 family protein has a diverse array of functions that are important to both the life and death of the cell.
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Affiliation(s)
- Xiao-Ming Yin
- Department of Pathology, University of Pittsburgh School of Medicine, 3550 Terrace Street, Pittsburgh, PA 15261, United States.
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43
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Han F, Shirasaki Y, Fukunaga K. 3-[2-[4-(3-Chloro-2-methylphenylmethyl)-1-piperazinyl]ethyl]-5,6-dimethoxy-1-(4-imidazolylmethyl)-1H-indazole Dihydro-chloride 3.5 Hydrate (DY-9760e) Is Neuroprotective in Rat Microsphere Embolism: Role of the Cross-Talk between Calpain and Caspase-3 through Calpastatin. J Pharmacol Exp Ther 2006; 317:529-36. [PMID: 16467455 DOI: 10.1124/jpet.105.095018] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Microsphere embolism (ME)-induced cerebral ischemia can elicit various pathological events leading to neuronal death. Western blotting and immunohistochemical studies revealed that expression of calpastatin, an endogenous calpain inhibitor, decreased after ME induction. Calpain activation after ME was apparently due to, in part, a decrease in calpastatin in a late phase of neuronal injury. The time course of that decrease also paralleled caspase-3 activation. In vitro studies demonstrated that calpastatin was degraded by caspase-3 in a Ca(2+)/calmodulin (CaM)-dependent manner. Because CaM binds directly to calpastatin, we asked whether a novel CaM antagonist, 3-[2-[4-(3-chloro-2-methylphenylmethyl)-1-piperazinyl]ethyl]-5,6-dimethoxy-1-(4-imidazolylmethyl)-1H-indazole dihydro-chloride 3.5 hydrate (DY-9760e), inhibits caspase-3-induced calpastatin degradation during ME-induced neuronal damage. We also tested the effect of DY-9760e on degradation of fodrin, a calpain substrate. Consistent with our hypothesis, DY-9760e (25 or 50 mg/kg i.p.) treatment inhibited degradation of calpastatin and fodrin in a dose-dependent manner. Because DY-9760e showed powerful neuroprotective activity with concomitant inhibition of calpastatin degradation, cross-talk between calpain and caspase-3 through calpastatin possibly accounts for ME-induced neuronal injury. Taken together, both inhibition of caspase-3-induced calpastatin degradation and calpain-induced fodrin breakdown by DY-9760e in part mediate its neuroprotective action.
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Affiliation(s)
- Feng Han
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai 980-8578, Japan
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44
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Fischer U, Stroh C, Schulze-Osthoff K. Unique and overlapping substrate specificities of caspase-8 and caspase-10. Oncogene 2006; 25:152-9. [PMID: 16186808 DOI: 10.1038/sj.onc.1209015] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Although caspase-8 has an established role as an initiator of death receptor-mediated apoptosis, the function of its closest homolog, caspase-10, is almost completely unknown. To gain a closer insight into the physiological function of caspase-10, we compared the cleavage of known caspase-8 substrates by both initiator caspases. We demonstrate that caspase-10 and -8 have overlapping cleavage preferences for several substrates such as the kinases RIP and PAK2. Interestingly, in other substrates, such as the Bcl-2 protein Bid, we found additional and distinct cleavage sites for both caspases, which might have important consequences for mitochondrial targeting and propagation of the death signal. Caspase-8 and -10 also caused different interchain cleavage patterns of their enzyme precursors. Together, these results suggest that caspase-8 and -10, despite having overlapping functions, also have selective substrate cleavage specificities and might thereby exert nonredundant roles in apoptosis signaling.
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Affiliation(s)
- U Fischer
- Institute of Molecular Medicine, Heinrich-Heine-University, Düsseldorf, Germany.
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45
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Du Pasquier D, Rincheval V, Sinzelle L, Chesneau A, Ballagny C, Sachs LM, Demeneix B, Mazabraud A. Developmental cell death duringXenopus metamorphosis involves BID cleavage and caspase 2 and 8 activation. Dev Dyn 2006; 235:2083-94. [PMID: 16786588 DOI: 10.1002/dvdy.20874] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Elimination of tadpole organs during Xenopus metamorphosis is largely achieved through apoptosis, and recent evidence suggest involvement of the mitochondrial death route and bax-initiated caspase-3 and -9 deployment. However, events upstream of the activation of Bax are unknown. In other models, proteins of the BH3-only group such as BID are known to assure this function. We show that Xenopus bid transcript levels increase at metamorphosis in larval cells destined to disappear. This increase correlates with an abrupt rise in Caspase-2 and -8 mRNA levels and an enhanced activity of Caspase-2 and -8. In BIDGFP transgenic animal's tail regression is accelerated. The cleavage of BIDGFP fusion protein during natural or T(3)-induced metamorphosis was specifically inhibited by caspase-8 inhibitors. Our results show that tail regression at metamorphosis implicates an apoptotic pathway inducible by T(3) hormone in an organ autonomous manner and involving the cell death executioners BID and Caspases-2 and -8.
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Affiliation(s)
- D Du Pasquier
- Laboratoire de Transgenèse et Génétique des Amphibiens, CNRS UMR 8080, IBAIC, Université Paris-Sud, Orsay Cedex, France
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46
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Vogel A, Aslan JE, Willenbring H, Klein C, Finegold M, Mount H, Thomas G, Grompe M. Sustained phosphorylation of Bid is a marker for resistance to Fas-induced apoptosis during chronic liver diseases. Gastroenterology 2006; 130:104-19. [PMID: 16401474 PMCID: PMC1424224 DOI: 10.1053/j.gastro.2005.10.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2005] [Accepted: 09/28/2005] [Indexed: 01/07/2023]
Abstract
BACKGROUND & AIMS Increased rates of apoptosis have been reported to play a role in the pathophysiology of many disorders, including liver diseases. Conversely, genetic mutations that result in impairment of programmed cell death have been associated with cancer development. However, apoptosis resistance can also be the result of nongenetic stress adaptation, as seen in the cancer-prone metabolic liver disease hereditary tyrosinemia. To clarify whether stress-induced apoptosis resistance is a general feature of chronic liver diseases, an animal model of chronic cholestasis was examined. METHODS Studies were performed with mice before and 2 weeks following bile duct ligation and with Fah-/- and Fah/p21-/- mice before and after NTBC withdrawal. RESULTS Here we show that bile duct ligation induced profound resistance against Fas monoclonal antibody-mediated hepatocyte death. The apoptosis signaling pathway was blocked downstream of caspase-8 activation and proximal to mitochondrial cytochrome c release. In controls, activation of the Fas receptor resulted in rapid dephosphorylation of Bid and its subsequent cleavage, whereas Bid remained phosphorylated and uncleaved in chronic cholestasis and other models of hepatic apoptosis resistance. CONCLUSIONS We propose a model in which the phosphorylation status of Bid determines the apoptotic threshold of hepatocytes in vivo. Furthermore, resistance to apoptosis in chronic cholestasis may contribute to the long-term risk of cancer in this setting.
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Key Words
- bdl, bile duct ligation
- disc, death-inducing signaling complex
- egta, ethylene glycol-bis[β-aminoethyl ether]-n,n,n′,n′ -tetraacetic acid
- fadd, fas-associated death domain adaptor protein
- ht-1, hereditary tyrosinemia
- iaps, inhibitors of apoptosis proteins
- mab, monoclonal antibody
- nf-κb, nuclear factor κb
- pp2a, protein phosphatase 2a
- sds-page, sodium dodecyl sulfate/polyacrylamide gel electrophoresis
- tunel, terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling
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Affiliation(s)
- Arndt Vogel
- Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, Oregon, USA.
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Garofalo T, Giammarioli AM, Misasi R, Tinari A, Manganelli V, Gambardella L, Pavan A, Malorni W, Sorice M. Lipid microdomains contribute to apoptosis-associated modifications of mitochondria in T cells. Cell Death Differ 2005; 12:1378-89. [PMID: 15947792 DOI: 10.1038/sj.cdd.4401672] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Plasma membrane lipid microdomains have been considered as a sort of 'closed chamber', where several subcellular activities, including CD95/Fas-mediated proapoptotic signaling, take place. In this work we detected GD3 and GM3 gangliosides in isolated mitochondria from lymphoblastoid CEM cells. Moreover, we demonstrated the presence of microdomains in mitochondria by immunogold transmission electron microscopy. We also showed that GD3, the voltage-dependent anion channel-1 (VDAC-1) and the fission protein hFis1 are structural components of a multimolecular signaling complex, in which Bcl-2 family proteins (t-Bid and Bax) are recruited. The disruption of lipid microdomains in isolated mitochondria by methyl-beta-cyclodextrin prevented mitochondria depolarization induced by GD3 or t-Bid. Thus, mitochondrion appears as a subcompartmentalized organelle, in which microdomains may act as controllers of their apoptogenic programs, including fission-associated morphogenetic changes, megapore formation and function. These results disclose a new scenario in which mitochondria-associated lipid microdomains can act as regulators and catalysts of cell fate.
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Affiliation(s)
- T Garofalo
- Department of Experimental Medicine and Pathology, University of Rome La Sapienza, Rome, Italy
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48
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Sandra F, Esposti MD, Ndebele K, Gona P, Knight D, Rosenquist M, Khosravi-Far R. Tumor necrosis factor-related apoptosis-inducing ligand alters mitochondrial membrane lipids. Cancer Res 2005; 65:8286-97. [PMID: 16166305 PMCID: PMC2941886 DOI: 10.1158/0008-5472.can-04-1913] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) has been shown to have selective antitumor activity. TRAIL induces ubiquitous pathways of cell death in which caspase activation is mediated either directly or via the release of apoptogenic factors from mitochondria; however, the precise components of the mitochondrial signaling pathway have not been well defined. Notably, mitochondria constitute an important target in overcoming resistance to TRAIL in many types of tumors. Bid is considered to be fundamental in engaging mitochondria during death receptor-mediated apoptosis, but this action is dependent on mitochondrial lipids. Here, we report that TRAIL signaling induces an alteration in mitochondrial membrane lipids, particularly cardiolipin. This occurs independently of caspase activation and primes mitochondrial membranes to the proapoptotic action of Bid. We unveil a link between TRAIL signaling and alteration of membrane lipid homeostasis that occurs in parallel to apical caspase activation but does not take over the mode of cell death because of the concurrent activation of caspase-8. In particular, TRAIL-induced alteration of mitochondrial lipids follows an imbalance in the cellular homeostasis of phosphatidylcholine, which results in an elevation in diacylglycerol (DAG). Elevated DAG in turn activates the delta isoform of phospholipid-dependent serine/threonine protein kinase C, which then accelerates the cleavage of caspase-8. We also show that preservation of phosphatidylcholine homeostasis by inhibition of lipid-degrading enzymes almost completely impedes the activation of pro-caspase-9 while scarcely changing the activation of caspase-8.
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Affiliation(s)
- Ferry Sandra
- Department of Pathology, Harvard Medical School, Beth Israel Deaconess Medical Center
| | | | - Kenneth Ndebele
- Department of Pathology, Harvard Medical School, Beth Israel Deaconess Medical Center
| | - Philimon Gona
- Statistics and Consulting Unit, Department of Mathematics and Statistics, Boston University, Boston, Massachusetts
| | - David Knight
- Faculty Life Sciences, University of Manchester, Manchester, United Kingdom
| | - Magnus Rosenquist
- Department of Pathology, Harvard Medical School, Beth Israel Deaconess Medical Center
| | - Roya Khosravi-Far
- Department of Pathology, Harvard Medical School, Beth Israel Deaconess Medical Center
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49
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Mailliet F, Ferry G, Vella F, Berger S, Cogé F, Chomarat P, Mallet C, Guénin SP, Guillaumet G, Viaud-Massuard MC, Yous S, Delagrange P, Boutin JA. Characterization of the melatoninergic MT3 binding site on the NRH:quinone oxidoreductase 2 enzyme. Biochem Pharmacol 2005; 71:74-88. [PMID: 16293234 DOI: 10.1016/j.bcp.2005.09.030] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2005] [Revised: 09/28/2005] [Accepted: 09/29/2005] [Indexed: 01/05/2023]
Abstract
Melatonin acts through a series of molecular targets: the G-protein coupled receptors, MT1 and MT2, and a third binding site, MT3, recently identified as the enzyme NRH:quinone oxydoreductase 2 (QR2). The relationship between the multiple physiological functions of melatonin and this enzyme remains unclear. Because of the relationship of QR2 with the redox status of cells, these studies could bring the first tools for a molecular rationale of the antioxidant effects of melatonin. In the present paper, we used a QR2-stably expressing cell line and hamster kidneys to compare the 2-[125I]-iodomelatonin and 2-[125I]-iodo-5-methoxycarbonylamino-N-acetyltryptamine binding data, and to characterize the MT3 binding site. We designed and tested compounds from two distinct chemicals series in a displacement assay of the two MT3 ligands, 2-[125I]-iodomelatonin and 2-[125I]-iodo-5-methoxycarbonylamino-N-acetyltryptamine from their cloned target. We also tested their ability to inhibit QR2 catalytic activity. These compounds were separated into two classes: those that bind within the catalytic site (and being inhibitors) and those that bind outside it (and therefore not being inhibitors). Compounds range from potent ligands (K(i) = 1 nM) to potent inhibitors (14 nM), and include one compound [NMDPEF: N-[2-(2-methoxy-6H-dipyrido[2,3-a:3,2-e]pyrrolizin-11-yl)ethyl]-2-furamide] active on both parameters in the low nanomolar range. To dissect the physio-pathological pathways in which QR2, MT3 and melatonin meet, one needs more compounds binding to MT3 and/or inhibitors of QR2 enzymatic activity. The compounds described in the present paper are new tools for such a task.
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Affiliation(s)
- François Mailliet
- Division de Pharmacologie Moléculaire et Cellulaire, Institut de Recherches Servier, 125 Chemin de Ronde, 78290 Croissy-sur-Seine, France
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50
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Eckhart L, Ballaun C, Uthman A, Kittel C, Stichenwirth M, Buchberger M, Fischer H, Sipos W, Tschachler E. Identification and Characterization of a Novel Mammalian Caspase with Proapoptotic Activity. J Biol Chem 2005; 280:35077-80. [PMID: 16120609 DOI: 10.1074/jbc.c500282200] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Caspases are essential proteases in programmed cell death and inflammation. Studies in murine and human cells have led to the characterization of 14 members of this enzyme family. Here we report the identification of caspase-15, a novel caspase that is expressed in various mammalian species including pig, dog, and cattle. The caspase-15 protein contains a catalytic domain with all amino acid residues critical for caspase activity and a prodomain that is predicted to fold into a pyrin domain structure, which is a unique feature among mammalian caspases. Recombinant porcine caspase-15 underwent autocatalytic processing into its subunits and cleaved both tetrapeptide caspase substrates and the apoptosis regulator protein Bid in vitro. Overexpression of caspase-15 in mammalian cells induced proenzyme maturation, cleavage of Bid, activation of caspase-3, and eventually cell death. Both the proteolytic and the pro-apoptotic activity of caspase-15 were abolished by mutation of the active site cysteine. Since a homolog of caspase-15 is absent in the human and the mouse genome, our results reveal an unexpected variability in the molecular apoptotic machinery of mammals.
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Affiliation(s)
- Leopold Eckhart
- Department of Dermatology, Medical University of Vienna, Vienna A-1090, Austria
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