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Bierhansl L, Gola L, Narayanan V, Dik A, Meuth SG, Wiendl H, Kovac S. Neuronal Mitochondrial Calcium Uniporter (MCU) Deficiency Is Neuroprotective in Hyperexcitability by Modulation of Metabolic Pathways and ROS Balance. Mol Neurobiol 2024:10.1007/s12035-024-04148-x. [PMID: 38652352 DOI: 10.1007/s12035-024-04148-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 03/23/2024] [Indexed: 04/25/2024]
Abstract
Epilepsy is one of the most common neurological disorders in the world. Common epileptic drugs generally affect ion channels or neurotransmitters and prevent the emergence of seizures. However, up to a third of the patients suffer from drug-resistant epilepsy, and there is an urgent need to develop new therapeutic strategies that go beyond acute antiepileptic (antiseizure) therapies towards therapeutics that also might have effects on chronic epilepsy comorbidities such as cognitive decline and depression. The mitochondrial calcium uniporter (MCU) mediates rapid mitochondrial Ca2+ transport through the inner mitochondrial membrane. Ca2+ influx is essential for mitochondrial functions, but longer elevations of intracellular Ca2+ levels are closely associated with seizure-induced neuronal damage, which are underlying mechanisms of cognitive decline and depression. Using neuronal-specific MCU knockout mice (MCU-/-ΔN), we demonstrate that neuronal MCU deficiency reduced hippocampal excitability in vivo. Furthermore, in vitro analyses of hippocampal glioneuronal cells reveal no change in total Ca2+ levels but differences in intracellular Ca2+ handling. MCU-/-ΔN reduces ROS production, declines metabolic fluxes, and consequently prevents glioneuronal cell death. This effect was also observed under pathological conditions, such as the low magnesium culture model of seizure-like activity or excitotoxic glutamate stimulation, whereby MCU-/-ΔN reduces ROS levels and suppresses Ca2+ overload seen in WT cells. This study highlights the importance of MCU at the interface of Ca2+ handling and metabolism as a mediator of stress-related mitochondrial dysfunction, which indicates the modulation of MCU as a potential target for future antiepileptogenic therapy.
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Affiliation(s)
- Laura Bierhansl
- Department of Neurology With Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Lukas Gola
- Department of Neurology With Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Venu Narayanan
- Department of Neurology With Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Andre Dik
- Department of Neurology With Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Sven G Meuth
- Department of Neurology, Medical Faculty and University Hospital, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Heinz Wiendl
- Department of Neurology With Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Stjepana Kovac
- Department of Neurology With Institute of Translational Neurology, University Hospital Münster, Münster, Germany.
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Mitochondrial Ca2+ handling as a cell signaling hub: lessons from astrocyte function. Essays Biochem 2023; 67:63-75. [PMID: 36636961 DOI: 10.1042/ebc20220094] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 12/16/2022] [Accepted: 12/22/2022] [Indexed: 01/14/2023]
Abstract
Astrocytes are a heterogenous population of macroglial cells spread throughout the central nervous system with diverse functions, expression signatures, and intricate morphologies. Their subcellular compartments contain a distinct range of mitochondria, with functional microdomains exhibiting widespread activities, such as controlling local metabolism and Ca2+ signaling. Ca2+ is an ion of utmost importance, both physiologically and pathologically, and participates in critical central nervous system processes, including synaptic plasticity, neuron-astrocyte integration, excitotoxicity, and mitochondrial physiology and metabolism. The mitochondrial Ca2+ handling system is formed by the mitochondrial Ca2+ uniporter complex (MCUc), which mediates Ca2+ influx, and the mitochondrial Na+/Ca2+ exchanger (NCLX), responsible for most mitochondrial Ca2+ efflux, as well as additional components, including the mitochondrial permeability transition pore (mtPTP). Over the last decades, mitochondrial Ca2+ handling has been shown to be key for brain homeostasis, acting centrally in physiopathological processes such as astrogliosis, astrocyte-neuron activity integration, energy metabolism control, and neurodegeneration. In this review, we discuss the current state of knowledge regarding the mitochondrial Ca2+ handling system molecular composition, highlighting its impact on astrocytic homeostasis.
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The Multifaceted Roles of Zinc in Neuronal Mitochondrial Dysfunction. Biomedicines 2021; 9:biomedicines9050489. [PMID: 33946782 PMCID: PMC8145363 DOI: 10.3390/biomedicines9050489] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/05/2021] [Accepted: 03/07/2021] [Indexed: 12/17/2022] Open
Abstract
Zinc is a highly abundant cation in the brain, essential for cellular functions, including transcription, enzymatic activity, and cell signaling. However, zinc can also trigger injurious cascades in neurons, contributing to the pathology of neurodegenerative diseases. Mitochondria, critical for meeting the high energy demands of the central nervous system (CNS), are a principal target of the deleterious actions of zinc. An increasing body of work suggests that intracellular zinc can, under certain circumstances, contribute to neuronal damage by inhibiting mitochondrial energy processes, including dissipation of the mitochondrial membrane potential (MMP), leading to ATP depletion. Additional consequences of zinc-mediated mitochondrial damage include reactive oxygen species (ROS) generation, mitochondrial permeability transition, and excitotoxic calcium deregulation. Zinc can also induce mitochondrial fission, resulting in mitochondrial fragmentation, as well as inhibition of mitochondrial motility. Here, we review the known mechanisms responsible for the deleterious actions of zinc on the organelle, within the context of neuronal injury associated with neurodegenerative processes. Elucidating the critical contributions of zinc-induced mitochondrial defects to neurotoxicity and neurodegeneration may provide insight into novel therapeutic targets in the clinical setting.
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Analysing the mechanism of mitochondrial oxidation-induced cell death using a multifunctional iridium(III) photosensitiser. Nat Commun 2021; 12:26. [PMID: 33397915 PMCID: PMC7782791 DOI: 10.1038/s41467-020-20210-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 11/16/2020] [Indexed: 02/06/2023] Open
Abstract
Mitochondrial oxidation-induced cell death, a physiological process triggered by various cancer therapeutics to induce oxidative stress on tumours, has been challenging to investigate owing to the difficulties in generating mitochondria-specific oxidative stress and monitoring mitochondrial responses simultaneously. Accordingly, to the best of our knowledge, the relationship between mitochondrial protein oxidation via oxidative stress and the subsequent cell death-related biological phenomena has not been defined. Here, we developed a multifunctional iridium(III) photosensitiser, Ir-OA, capable of inducing substantial mitochondrial oxidative stress and monitoring the corresponding change in viscosity, polarity, and morphology. Photoactivation of Ir-OA triggers chemical modifications in mitochondrial protein-crosslinking and oxidation (i.e., oxidative phosphorylation complexes and channel and translocase proteins), leading to microenvironment changes, such as increased microviscosity and depolarisation. These changes are strongly related to cell death by inducing mitochondrial swelling with excessive fission and fusion. We suggest a potential mechanism from mitochondrial oxidative stress to cell death based on proteomic analyses and phenomenological observations.
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5
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Harisseh R, Abrial M, Chiari P, Al-Mawla R, Villedieu C, Tessier N, Bidaux G, Ovize M, Gharib A. A modified calcium retention capacity assay clarifies the roles of extra- and intracellular calcium pools in mitochondrial permeability transition pore opening. J Biol Chem 2019; 294:15282-15292. [PMID: 31434742 DOI: 10.1074/jbc.ra119.009477] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 08/20/2019] [Indexed: 11/06/2022] Open
Abstract
Calcium homeostasis is essential for cell survival and is precisely controlled by several cellular actors such as the sarco/endoplasmic reticulum and mitochondria. Upon stress induction, Ca2+ released from sarco/endoplasmic reticulum stores and from extracellular Ca2+ pools accumulates in the cytosol and in the mitochondria. This induces Ca2+ overload and ultimately the opening of the mitochondrial permeability transition pore (mPTP), promoting cell death. Currently, it is unclear whether intracellular Ca2+ stores are sufficient to promote the mPTP opening. Ca2+ retention capacity (CRC) corresponds to the maximal Ca2+ uptake by the mitochondria before mPTP opening. In this study, using permeabilized cardiomyocytes isolated from adult mice, we modified the standard CRC assay by specifically inducing reticular Ca2+ release to investigate the respective contributions of reticular Ca2+ and extracellular Ca2+ to mPTP opening in normoxic conditions or after anoxia-reoxygenation. Our experiments revealed that Ca2+ released from the sarco/endoplasmic reticulum is not sufficient to trigger mPTP opening and corresponds to ∼50% of the total Ca2+ levels required to open the mPTP. We also studied mPTP opening after anoxia-reoxygenation in the presence or absence of extracellular Ca2+ In both conditions, Ca2+ leakage from internal stores could not trigger mPTP opening by itself but significantly decreased the CRC. Our findings highlight how a modified CRC assay enables the investigation of the role of reticular and extracellular Ca2+ pools in the regulation of the mPTP. We propose that this method may be useful for screening molecules of interest implicated in mPTP regulation.
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Affiliation(s)
- Rania Harisseh
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Maryline Abrial
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Pascal Chiari
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France .,Service d'Anesthésie Réanimation, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Ribal Al-Mawla
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Camille Villedieu
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Nolwenn Tessier
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Gabriel Bidaux
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Michel Ovize
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France.,Service d'Explorations Fonctionnelles Cardiovasculaires and Centre d'Investigation Clinique de Lyon, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
| | - Abdallah Gharib
- INSERM UMR 1060, CarMeN laboratory, Université Lyon 1, IHU OPERA, Hôpital Louis Pradel, Hospices Civils de Lyon, F-69677 Lyon, France
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Fels JA, Manfredi G. Sex Differences in Ischemia/Reperfusion Injury: The Role of Mitochondrial Permeability Transition. Neurochem Res 2019; 44:2336-2345. [PMID: 30863968 DOI: 10.1007/s11064-019-02769-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 03/04/2019] [Accepted: 03/06/2019] [Indexed: 12/23/2022]
Abstract
Brain and heart ischemia are among the leading causes of death and disability in both men and women, but there are significant sex differences in the incidence and severity of these diseases. Ca2+ dysregulation in response to ischemia/reperfusion injury (I/RI) is a well-recognized pathogenic mechanism leading to the death of affected cells. Excess intracellular Ca2+ causes mitochondrial matrix Ca2+ overload that can result in mitochondrial permeability transition (MPT), which can have severe consequences for mitochondrial function and trigger cell death. Recent findings indicate that estrogens and their related receptors are involved in the regulation of MPT, suggesting that sex differences in I/RI could be linked to estrogen-dependent modulation of mitochondrial Ca2+. Here, we review the evidence supporting sex differences in I/RI and the role of estrogen and estrogen receptors in producing these differences, the involvement of mitochondrial Ca2+ overload in disease pathogenesis, and the estrogen-dependent modulation of MPT that may contribute to sex differences.
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Affiliation(s)
- Jasmine A Fels
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 407 East 61st St., RR506, New York, NY, 10065, USA.,Weill Cornell Graduate School of Medical Sciences, Weill Cornell Medicine, New York, NY, 10065, USA
| | - Giovanni Manfredi
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 407 East 61st St., RR506, New York, NY, 10065, USA.
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Torrezan-Nitao E, Figueiredo RCBQ, Marques-Santos LF. Mitochondrial permeability transition pore in sea urchin female gametes. Mech Dev 2018; 154:208-218. [DOI: 10.1016/j.mod.2018.07.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 07/21/2018] [Accepted: 07/24/2018] [Indexed: 12/20/2022]
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8
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Liang W, Cui J, Zhang K, Xi H, Cai A, Li J, Gao Y, Hu C, Liu Y, Lu Y, Wang N, Wu X, Wei B, Chen L. Shikonin induces ROS-based mitochondria-mediated apoptosis in colon cancer. Oncotarget 2017; 8:109094-109106. [PMID: 29312593 PMCID: PMC5752506 DOI: 10.18632/oncotarget.22618] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 08/26/2017] [Indexed: 12/21/2022] Open
Abstract
Colon cancer is the third most common malignancy worldwide, and chemotherapy is a widely used strategy in clinical therapy. Chemotherapy-resistant of colon cancer is the main cause of recurrence and progression. Novel drugs with efficacy and safety in treating colon cancer are urgently needed. Shikonin, a naphthoquinone derived from the roots of the herbal plant Lithospermum erythrorhizon, has been determined to be a potent anti-tumor agent. The aim of the present study was to detect the underlying anti-tumor mechanism of shikonin in colon cancer. We found that shikonin suppressed the growth of colon cancer cells in a dose-dependent manner in vitro and in vivo. Shikonin induced mitochondria-mediated apoptosis, which was regulated by Bcl-2 family proteins. Shikonin increased the generation of intracellular ROS, which played an upstream role in shikonin-induced apoptosis. Our data indicated that generation of ROS, down-regulated expression of Bcl-2 and Bcl-xL, depolarization of the mitochondrial membrane potential and activation of the caspase cascade were components of the programmed event of shikonin-induced apoptosis in colon cancer cells. In addition, shikonin presented minimal toxicity to non-neoplastic colon cells and no liver injury in xenograft models, showing safety in the control of colon cancer cell growth in vitro and in vivo. Taken together, our findings suggest that shikonin might serve as a potential novel therapeutic drug in the treatment of human colon cancer.
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Affiliation(s)
- Wenquan Liang
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Jianxin Cui
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Kecheng Zhang
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Hongqing Xi
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Aizhen Cai
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Jiyang Li
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Yunhe Gao
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Chong Hu
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Yi Liu
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Yixun Lu
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Ning Wang
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Xiaosong Wu
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Bo Wei
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Lin Chen
- Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China.,Institute of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, China
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9
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Procoagulant platelets: generation, function, and therapeutic targeting in thrombosis. Blood 2017; 130:2171-2179. [DOI: 10.1182/blood-2017-05-787259] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 09/12/2017] [Indexed: 11/20/2022] Open
Abstract
Abstract
Current understanding of how platelets localize coagulation to wound sites has come mainly from studies of a subpopulation of activated platelets. In this review, we summarize data from the last 4 decades that have described these platelets with a range of descriptive titles and attributes. We identify striking overlaps in the reported characteristics of these platelets, which imply a single subpopulation of versatile platelets and thus suggest that their commonality requires unification of their description. We therefore propose the term procoagulant platelet as the unifying terminology. We discuss the agonist requirements and molecular drivers for the dramatic morphological transformation platelets undergo when becoming procoagulant. Finally, we provide perspectives on the biomarker potential of procoagulant platelets for thrombotic events as well as on the possible clinical benefits of inhibitors of carbonic anhydrase enzymes and the water channel Aquaporin-1 for targeting this subpopulation of platelets as antiprocoagulant antithrombotics.
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Vivoli M, Renou J, Chevalier A, Norville IH, Diaz S, Juli C, Atkins H, Holzgrabe U, Renard PY, Sarkar-Tyson M, Harmer NJ. A miniaturized peptidyl-prolyl isomerase enzyme assay. Anal Biochem 2017; 536:59-68. [PMID: 28803887 DOI: 10.1016/j.ab.2017.08.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 08/04/2017] [Accepted: 08/09/2017] [Indexed: 01/15/2023]
Abstract
Prolyl-peptidyl isomerases (PPIases) are enzymes that are found in all living organisms. They form an essential part of the cellular protein folding homeostasis machinery. PPIases are associated with many important human diseases, e.g. cardiovascular disease, cancer and Alzheimer's. The development of novel PPIase inhibitors has been limited by the lack of a rapid, laboratory-based assay for these enzymes, as their substrates and products are challenging to distinguish. A well described continuous assay, coupled with the hydrolysis of a peptide by chymotrypsin is highly effective, but comparatively slow. To address this, we developed an improved version of the traditional assay using a temperature controlled plate reader. This assay allows semi-automated medium throughput assays in an academic laboratory for 84 samples per day. The assay shows lower errors, with an average Z' of 0.72. We further developed the assay using a fluorogenic peptide-based FRET probe. This provides an extremely sensitive PPIase assay using substrate at 200 nM, which approaches single turnover conditions. The fluorescent probe achieves an excellent quenching efficiency of 98.6%, and initial experiments showed acceptable Z' of 0.31 and 0.30 for cyclophilin A and hFKBP12 respectively. The assays provide an improved toolset for the quantitative, biochemical analysis of PPIases.
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Affiliation(s)
- Mirella Vivoli
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4QD, United Kingdom
| | - Julien Renou
- Normandie Univ, UNIROUEN, CNRS, INSAREOUEN, COBRA, UMR 6014 & FR 3038, 1 rue Tesnière 76000 Rouen, France
| | - Arnaud Chevalier
- Normandie Univ, UNIROUEN, CNRS, INSAREOUEN, COBRA, UMR 6014 & FR 3038, 1 rue Tesnière 76000 Rouen, France
| | - Isobel H Norville
- Defence Science and Technology Laboratory, Porton Down SP4 0JQ, United Kingdom
| | - Suraya Diaz
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4QD, United Kingdom
| | - Christina Juli
- Institute of Pharmacy, University of Würzburg, Am Hubland, 970074 Würzburg, Germany
| | - Helen Atkins
- Defence Science and Technology Laboratory, Porton Down SP4 0JQ, United Kingdom
| | - Ulrike Holzgrabe
- Institute of Pharmacy, University of Würzburg, Am Hubland, 970074 Würzburg, Germany
| | - Pierre-Yves Renard
- Normandie Univ, UNIROUEN, CNRS, INSAREOUEN, COBRA, UMR 6014 & FR 3038, 1 rue Tesnière 76000 Rouen, France
| | - Mitali Sarkar-Tyson
- Defence Science and Technology Laboratory, Porton Down SP4 0JQ, United Kingdom; Marshall Centre for Infectious Diseases, School of Pathology and Laboratory Medicine, University of Western Australia, Crawley, WA 6009, Australia
| | - Nicholas J Harmer
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4QD, United Kingdom.
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Abstract
Current models theorizing on what the mitochondrial permeability transition (mPT) pore is made of, implicate the c-subunit rings of ATP synthase complex. However, two very recent studies, one on atomistic simulations and in the other disrupting all genes coding for the c subunit disproved those models. As a consequence of this, the structural elements of the pore remain unknown. The purpose of the present short-review is to (i) briefly review the latest findings, (ii) serve as an index for more comprehensive reviews regarding mPT specifics, (iii) reiterate on the potential pitfalls while investigating mPT in conjunction to bioenergetics, and most importantly (iv) suggest to those in search of mPT pore identity, to also look elsewhere.
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Affiliation(s)
- Christos Chinopoulos
- Department of Medical Biochemistry, Semmelweis University, Budapest 1094, Hungary; MTA-SE Lendület Neurobiochemistry Research Group, Hungary.
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12
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Yue J, Jin S, Li Y, Zhang L, Jiang W, Yang C, Du J. Magnesium inhibits the calcification of the extracellular matrix in tendon-derived stem cells via the ATP-P2R and mitochondrial pathways. Biochem Biophys Res Commun 2016; 478:314-322. [PMID: 27402270 DOI: 10.1016/j.bbrc.2016.06.108] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 06/22/2016] [Indexed: 01/14/2023]
Abstract
Tendon calcification has been widely regarded by researchers to result from the osteogenic differentiation of Tendon-Derived Stem Cells (TDSCs) and ectopic mineralization caused by the calcification of cellular matrix. Recent studies have revealed a correlation between the Mg(2+)/Ca(2+) balance and the degeneration or calcification of tendon tissues. Furthermore, the ATP-P2X/P2Y receptor pathway has been shown to play a decisive role in the process of calcification, with calcium exportation from mitochondria and calcium oscillations potentially representing the cohesive signal produced by this pathway. Our previous study demonstrated that matrix calcification is inhibited by magnesium. In this study, we examined the effects of extracellular Mg(2+) on the deposition of calcium phosphate matrix and cellular pathways in TDSCs. The suppression of the export of calcium from mitochondria has also been detected. We found that a high concentration of extracellular Mg(2+) ([Mg(2+)]e) inhibited the mineralization of the extracellular matrix in TDSCs and that 100 μM ATP reversed this inhibitory effect in vitro. In addition, the spontaneous release of ATP was inhibited by high [Mg(2+)]e levels. A high [Mg(2+)]e suppressed the expression of P2X4, P2X5 and P2X7 and activated the expression of P2Y1, P2Y2, P2Y4 and P2Y14. The interaction between Mg(2+) and Ca(2+) is therefore contradictory, Mg(2+) inhibits mitochondrial calcium concentrations, meanwhile it reverses the opening of mPTP that is induced by Ca(2+). JC-1 staining verified the protective effect of Mg(2+) on mitochondrial membrane potential and the decrease induced by Ca(2+). Taken together, these results indicate that high [Mg(2+)]e interferes with the expression of P2 receptors, resulting in decreased extracellular mineralization. The balance between Mg(2+) and Ca(2+) influences mitochondrial calcium exportation and provides another explanation for the mechanism underlying matrix calcification in TDSCs.
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Affiliation(s)
- Jiaji Yue
- Department of Orthopedics, Shanghai Tenth People's Hospital, Tenth People's Hospital of Tongji University, 301 Middle Yanchang Road, Shanghai 200072, People's Republic of China; Tongji University School of Medicine, 1239 Siping Road, Shanghai 200092, People's Republic of China
| | - Shanzi Jin
- Department of Orthopedics, Shanghai Tenth People's Hospital, Tenth People's Hospital of Tongji University, 301 Middle Yanchang Road, Shanghai 200072, People's Republic of China; Tongji University School of Medicine, 1239 Siping Road, Shanghai 200092, People's Republic of China
| | - Yaqiang Li
- Department of Orthopedics, Shanghai Tenth People's Hospital, Tenth People's Hospital of Tongji University, 301 Middle Yanchang Road, Shanghai 200072, People's Republic of China; Tongji University School of Medicine, 1239 Siping Road, Shanghai 200092, People's Republic of China
| | - Li Zhang
- Department of Orthopedics, Shanghai Tenth People's Hospital, Tenth People's Hospital of Tongji University, 301 Middle Yanchang Road, Shanghai 200072, People's Republic of China; Department of Trauma Surgery, Klinikum rechts der lsar, Technical University of Munich, Ismaningerstrasse 22, 81675 Munich, Germany
| | - Wenwei Jiang
- Department of Orthopedics, Shanghai Tenth People's Hospital, Tenth People's Hospital of Tongji University, 301 Middle Yanchang Road, Shanghai 200072, People's Republic of China; The First Clinical Medical College, Nanjing Medical University, 140 Hanzhong Road, Nanjing 210029, People's Republic of China
| | - Chunxi Yang
- Department of Orthopedics, Shanghai Tenth People's Hospital, Tenth People's Hospital of Tongji University, 301 Middle Yanchang Road, Shanghai 200072, People's Republic of China.
| | - Jiang Du
- School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
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13
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Doczi J, Torocsik B, Echaniz-Laguna A, Mousson de Camaret B, Starkov A, Starkova N, Gál A, Molnár MJ, Kawamata H, Manfredi G, Adam-Vizi V, Chinopoulos C. Alterations in voltage-sensing of the mitochondrial permeability transition pore in ANT1-deficient cells. Sci Rep 2016; 6:26700. [PMID: 27221760 PMCID: PMC4879635 DOI: 10.1038/srep26700] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2015] [Accepted: 05/09/2016] [Indexed: 01/03/2023] Open
Abstract
The probability of mitochondrial permeability transition (mPT) pore opening is inversely related to the magnitude of the proton electrochemical gradient. The module conferring sensitivity of the pore to this gradient has not been identified. We investigated mPT’s voltage-sensing properties elicited by calcimycin or H2O2 in human fibroblasts exhibiting partial or complete lack of ANT1 and in C2C12 myotubes with knocked-down ANT1 expression. mPT onset was assessed by measuring in situ mitochondrial volume using the ‘thinness ratio’ and the ‘cobalt-calcein’ technique. De-energization hastened calcimycin-induced swelling in control and partially-expressing ANT1 fibroblasts, but not in cells lacking ANT1, despite greater losses of mitochondrial membrane potential. Matrix Ca2+ levels measured by X-rhod-1 or mitochondrially-targeted ratiometric biosensor 4mtD3cpv, or ADP-ATP exchange rates did not differ among cell types. ANT1-null fibroblasts were also resistant to H2O2-induced mitochondrial swelling. Permeabilized C2C12 myotubes with knocked-down ANT1 exhibited higher calcium uptake capacity and voltage-thresholds of mPT opening inferred from cytochrome c release, but intact cells showed no differences in calcimycin-induced onset of mPT, irrespective of energization and ANT1 expression, albeit the number of cells undergoing mPT increased less significantly upon chemically-induced hypoxia than control cells. We conclude that ANT1 confers sensitivity of the pore to the electrochemical gradient.
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Affiliation(s)
- Judit Doczi
- Department of Medical Biochemistry, Semmelweis University MTA-SE Laboratory for Neurobiochemistry, Budapest, 1094, Hungary.,MTA-SE Lendület Neurobiochemistry Research Group, Budapest, Hungary
| | - Beata Torocsik
- Department of Medical Biochemistry, Semmelweis University MTA-SE Laboratory for Neurobiochemistry, Budapest, 1094, Hungary
| | - Andoni Echaniz-Laguna
- Département de Neurologie, Hôpitaux Universitaires, Hôpital de Hautepierre, 67098 Strasbourg cedex, France
| | - Bénédicte Mousson de Camaret
- Service des Maladies Héréditaires du Métabolisme, Centre de Biologie et de Pathologie Est, CHU Lyon, 69677 Bron cedex, France
| | - Anatoly Starkov
- Feil Family Brain and Mind Research Institute, Weill Cornell Medical College, New York, NY 10065, USA
| | - Natalia Starkova
- Icahn School of Medicine at Mount Sinai, Department of Hematology and Medical Oncology, New York, NY 10029, USA
| | - Aniko Gál
- Institute of Genomic Medicine and Rare Disorders, Semmelweis University, Budapest, 1083, Hungary
| | - Mária J Molnár
- Institute of Genomic Medicine and Rare Disorders, Semmelweis University, Budapest, 1083, Hungary
| | - Hibiki Kawamata
- Feil Family Brain and Mind Research Institute, Weill Cornell Medical College, New York, NY 10065, USA
| | - Giovanni Manfredi
- Feil Family Brain and Mind Research Institute, Weill Cornell Medical College, New York, NY 10065, USA
| | - Vera Adam-Vizi
- Department of Medical Biochemistry, Semmelweis University MTA-SE Laboratory for Neurobiochemistry, Budapest, 1094, Hungary
| | - Christos Chinopoulos
- Department of Medical Biochemistry, Semmelweis University MTA-SE Laboratory for Neurobiochemistry, Budapest, 1094, Hungary.,MTA-SE Lendület Neurobiochemistry Research Group, Budapest, Hungary
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14
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Ye S, Zhou T, Cheng K, Chen M, Wang Y, Jiang Y, Yang P. Carboxylic Acid Fullerene (C60) Derivatives Attenuated Neuroinflammatory Responses by Modulating Mitochondrial Dynamics. NANOSCALE RESEARCH LETTERS 2015; 10:953. [PMID: 26058514 PMCID: PMC4481245 DOI: 10.1186/s11671-015-0953-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 05/21/2015] [Indexed: 05/30/2023]
Abstract
Fullerene (C60) derivatives, a unique class of compounds with potent antioxidant properties, have been reported to exert a wide variety of biological activities including neuroprotective properties. Mitochondrial dynamics are an important constituent of cellular quality control and function, and an imbalance of the dynamics eventually leads to mitochondria disruption and cell dysfunctions. This study aimed to assess the effects of carboxylic acid C60 derivatives (C60-COOH) on mitochondrial dynamics and elucidate its associated mechanisms in lipopolysaccharide (LPS)-stimulated BV-2 microglial cell model. Using a cell-based functional screening system labeled with DsRed2-mito in BV-2 cells, we showed that LPS stimulation led to excessive mitochondrial fission, increased mitochondrial localization of dynamin-related protein 1 (Drp1), both of which were markedly suppressed by C60-COOH pretreatment. LPS-induced mitochondria reactive oxygen species (ROS) generation and collapse of mitochondrial membrane potential (ΔΨm) were also significantly inhibited by C60-COOH. Moreover, we also found that C60-COOH pretreatment resulted in the attenuation of LPS-mediated activation of nuclear factor (NF)-κB and mitogen-activated protein kinase (MAPK) signaling, as well as the production of pro-inflammatory mediators. Taken together, these findings demonstrated that carboxylic acid C60 derivatives may exert neuroprotective effects through regulating mitochondrial dynamics and functions in microglial cells, thus providing novel insights into the mechanisms of the neuroprotective properties of carboxylic acid C60 derivatives.
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Affiliation(s)
- Shefang Ye
- />Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, Xiamen University, Xiamen, 361005 People’s Republic of China
| | - Tong Zhou
- />Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, Xiamen University, Xiamen, 361005 People’s Republic of China
| | - Keman Cheng
- />Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, Xiamen University, Xiamen, 361005 People’s Republic of China
| | - Mingliang Chen
- />Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005 People’s Republic of China
| | - Yange Wang
- />Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, Xiamen University, Xiamen, 361005 People’s Republic of China
| | - Yuanqin Jiang
- />Department of Surgery, First Affiliated Hospital of Xiamen University, Xiamen, 361003 People’s Republic of China
| | - Peiyan Yang
- />Department of Surgery, First Affiliated Hospital of Xiamen University, Xiamen, 361003 People’s Republic of China
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15
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Gao J, Sang M, Zhang X, Zheng T, Pan J, Dai M, Zhou L, Yang S. Miro1-mediated mitochondrial dysfunction under high nutrient stress is linked to NOD-like receptor 3 (NLRP3)-dependent inflammatory responses in rat pancreatic beta cells. Free Radic Biol Med 2015; 89:322-32. [PMID: 26427885 DOI: 10.1016/j.freeradbiomed.2015.09.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Revised: 09/10/2015] [Accepted: 09/20/2015] [Indexed: 12/12/2022]
Abstract
Type 2 Diabetes (T2D) is associated with a state of low-grade inflammation that leads to insulin resistance under sustained high-fat and glucose (HFG) stress. Mitochondria from pancreatic beta cells play an essential role by metabolizing nutrients and generating signals required for both triggering and amplifying pathways of insulin secretion responding to HFG. However, the underlying pathway linking mitochondrial function to initiate and integrate inflammatory responses within the pancreatic beta cells under HFG stress remains poorly defined. Here, we demonstrated that HFG induced Ca(2+)-mediated deleterious effects on mitochondrial rho GTPase 1 (Miro1), a protein allowing mitochondria to move along microtubules to regulate mitochondria dynamics. This redistribution of Miro1 by HFG led to aggravation of proinflammatory responses in rat islets due to damaged mitochondria-producing reactive oxygen species (ROS). In addition, HFG-induced Ca(2+)-mediated increased expression of mitochondrial dynamin-like protein (DLP1) was assembled on the outer membrane of mitochondria to initiate fission events. Higher expression of DLP1 induced mitochondria fragmentation as expected but was not essential for ROS-induced proinflammatory responses, while Miro1-mediated mitochondrial dysfunction induced proinflammatory responses under HFG stress. Combined, we proposed in this study that HFG stress caused mtROS release mainly through Miro1-mediated effects on mitochondria in pancreatic beta cells triggering the NLRP3-dependent proinflammatory responses and, subsequently, damaged insulin secretion.
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Affiliation(s)
- Jianfeng Gao
- ABSL-3 Laboratory at the Center for Animal Experiment and State Key Laboratory of Virology, Wuhan University School of Medicine, Wuhan 430071, People's Republic of China
| | - Ming Sang
- ABSL-3 Laboratory at the Center for Animal Experiment and State Key Laboratory of Virology, Wuhan University School of Medicine, Wuhan 430071, People's Republic of China; College of Basic Medical Sciences, Central Laboratory of the Fourth Affiliated Hospital in Xiangyang, Hubei Key Laboratory of Wudang Local Chinese Medicine Research, Hubei University of Medicine, Shiyan 442000, People's Republic of China
| | - Xiaoyu Zhang
- Animal Experiment Center, General Hospital of Guangzhou Military Command, Guangzhou, 510010, People's Republic of China
| | - Tian Zheng
- Department of Ophthalmology, Zhongnan Hospital, Wuhan University 430071, People's Republic of China
| | - Jiawen Pan
- ABSL-3 Laboratory at the Center for Animal Experiment and State Key Laboratory of Virology, Wuhan University School of Medicine, Wuhan 430071, People's Republic of China
| | - Ming Dai
- ABSL-3 Laboratory at the Center for Animal Experiment and State Key Laboratory of Virology, Wuhan University School of Medicine, Wuhan 430071, People's Republic of China
| | - Li Zhou
- ABSL-3 Laboratory at the Center for Animal Experiment and State Key Laboratory of Virology, Wuhan University School of Medicine, Wuhan 430071, People's Republic of China
| | - Sijun Yang
- ABSL-3 Laboratory at the Center for Animal Experiment and State Key Laboratory of Virology, Wuhan University School of Medicine, Wuhan 430071, People's Republic of China.
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16
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Chen H, Liu C, Yin J, Chen Z, Xu J, Wang D, Zhu J, Zhang Z, Sun Y, Li A. Mitochondrial Cyclophilin D as a Potential Therapeutic Target for Ischemia-Induced Facial Palsy in Rats. Cell Mol Neurobiol 2015; 35:931-41. [PMID: 25820785 DOI: 10.1007/s10571-015-0188-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Accepted: 03/25/2015] [Indexed: 10/23/2022]
Abstract
Many studies have demonstrated that ischemia could induce facial nerve (FN) injury. However, there is a lack of a suitable animal model for FN injury study and thus little knowledge is available about the precise mechanism for FN injury. The aims of this study were to establish a reliable FN injury model induced by blocking the petrosal artery and to investigate whether dysfunctional interaction between cyclophilin D (CypD) and mitochondrial permeability transition pore (MPTP) can mediate cell dysfunction in ischemic FN injury. The outcomes of ischemia-induced FN injury rat model were evaluated by behavioral assessment, histological observation, electrophysiology, and electron microscopy. Then the levels of CypD and protein that forms the MPTP were evaluated under the conditions with or without the treatment of Cyclosporin A (CsA), which has been found to disrupt MPTP through the binding of CypD. The blocking of petrosal artery caused significant facial palsy signs in the ischemia group but not in the sham group. Furthermore, ischemia can induce the dysfunction of facial nucleus neurons and destruction of the myelin sheath and increase the protein levels of CypD and MPTP protein compared with sham group. Interestingly, treatment with CsA significantly improved neurological function and reversed the ischemia-induced increase of CypD and MPTP proteins in ischemia group. These results demonstrated that blocking of petrosal artery in rats can induce FN injury and the mechanism may be related to the disruption of MPTP by CypD.
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Affiliation(s)
- Huizhen Chen
- Department of Neurosurgery, The First People's Hospital of Lianyungang, 182 Tong Guan North Road, Lianyungang, Jiangsu, 222002, People's Republic of China
| | - Chnagtao Liu
- Department of Neurosurgery, The First People's Hospital of Lianyungang, 182 Tong Guan North Road, Lianyungang, Jiangsu, 222002, People's Republic of China
| | - Jie Yin
- Department of Neurosurgery, Xuzhou Central Hospital, Xuzhou, Jiangsu, 221009, People's Republic of China
| | - Zhen Chen
- Department of Neurosurgery, The First People's Hospital of Lianyungang, 182 Tong Guan North Road, Lianyungang, Jiangsu, 222002, People's Republic of China
| | - Jinwang Xu
- Department of Neurosurgery, The First People's Hospital of Lianyungang, 182 Tong Guan North Road, Lianyungang, Jiangsu, 222002, People's Republic of China
| | - Duanlei Wang
- Department of Neurosurgery, The First People's Hospital of Lianyungang, 182 Tong Guan North Road, Lianyungang, Jiangsu, 222002, People's Republic of China
| | - Jiaqiu Zhu
- Department of Neurosurgery, The First People's Hospital of Lianyungang, 182 Tong Guan North Road, Lianyungang, Jiangsu, 222002, People's Republic of China
| | - Ziyuan Zhang
- Department of Neurosurgery, The First People's Hospital of Lianyungang, 182 Tong Guan North Road, Lianyungang, Jiangsu, 222002, People's Republic of China
| | - Yong Sun
- Department of Neurosurgery, The First People's Hospital of Lianyungang, 182 Tong Guan North Road, Lianyungang, Jiangsu, 222002, People's Republic of China
| | - Aimin Li
- Department of Neurosurgery, The First People's Hospital of Lianyungang, 182 Tong Guan North Road, Lianyungang, Jiangsu, 222002, People's Republic of China.
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17
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Gainutdinov T, Molkentin JD, Siemen D, Ziemer M, Debska-Vielhaber G, Vielhaber S, Gizatullina Z, Orynbayeva Z, Gellerich FN. Knockout of cyclophilin D in Ppif⁻/⁻ mice increases stability of brain mitochondria against Ca²⁺ stress. Arch Biochem Biophys 2015; 579:40-6. [PMID: 26032335 DOI: 10.1016/j.abb.2015.05.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2015] [Revised: 05/24/2015] [Accepted: 05/25/2015] [Indexed: 01/16/2023]
Abstract
The mitochondrial peptidyl prolyl isomerase cyclophilin D (CypD) activates permeability transition (PT). To study the role of CypD in this process we compared the functions of brain mitochondria isolated from wild type (BMWT) and CypD knockout (Ppif(-/-)) mice (BMKO) with and without CypD inhibitor Cyclosporin A (CsA) under normal and Ca(2+) stress conditions. Our data demonstrate that BMKO are characterized by higher rates of glutamate/malate-dependent oxidative phosphorylation, higher membrane potential and higher resistance to detrimental Ca(2+) effects than BMWT. Under the elevated Ca(2+) and correspondingly decreased membrane potential the dose response in BMKO shifts to higher Ca(2+) concentrations as compared to BMWT. However, significantly high Ca(2+) levels result in complete loss of membrane potential in BMKO, too. CsA diminishes the loss of membrane potential in BMWT but has no protecting effect in BMKO. The results are in line with the assumption that PT is regulated by CypD under the control of matrix Ca(2+). Due to missing of CypD the BMKO can favor PT only at high Ca(2+) concentrations. It is concluded that CypD sensitizes the brain mitochondria to PT, and its inhibition by CsA or CypD absence improves the complex I-related mitochondrial function and increases mitochondria stability against Ca(2+) stress.
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Affiliation(s)
- T Gainutdinov
- Department of Neurology, Otto-von-Guericke-University, Magdeburg D-39120, Germany; Institute of Ecology and Use of Mineral Resources, Academy of Sciences of Tatarstan, Kazan 420087, Russian Federation
| | - J D Molkentin
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Howard Hughes Medical Institute, Cincinnati, OH 45229, USA
| | - D Siemen
- Department of Neurology, Otto-von-Guericke-University, Magdeburg D-39120, Germany
| | - M Ziemer
- Department of Neurology, Otto-von-Guericke-University, Magdeburg D-39120, Germany
| | - G Debska-Vielhaber
- Department of Neurology, Otto-von-Guericke-University, Magdeburg D-39120, Germany
| | - S Vielhaber
- Department of Neurology, Otto-von-Guericke-University, Magdeburg D-39120, Germany
| | - Z Gizatullina
- Leibniz Institute for Neurobiology, Brennecke Str. 6, Magdeburg D-39118, Germany
| | - Z Orynbayeva
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA 19102, USA.
| | - F N Gellerich
- Department of Neurology, Otto-von-Guericke-University, Magdeburg D-39120, Germany; Leibniz Institute for Neurobiology, Brennecke Str. 6, Magdeburg D-39118, Germany.
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18
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Abstract
Neurodegeneration correlates with Alzheimer's disease (AD) symptoms, but the molecular identities of pathogenic amyloid β-protein (Aβ) oligomers and their targets, leading to neurodegeneration, remain unclear. Amylospheroids (ASPD) are AD patient-derived 10- to 15-nm spherical Aβ oligomers that cause selective degeneration of mature neurons. Here, we show that the ASPD target is neuron-specific Na(+)/K(+)-ATPase α3 subunit (NAKα3). ASPD-binding to NAKα3 impaired NAKα3-specific activity, activated N-type voltage-gated calcium channels, and caused mitochondrial calcium dyshomeostasis, tau abnormalities, and neurodegeneration. NMR and molecular modeling studies suggested that spherical ASPD contain N-terminal-Aβ-derived "thorns" responsible for target binding, which are distinct from low molecular-weight oligomers and dodecamers. The fourth extracellular loop (Ex4) region of NAKα3 encompassing Asn(879) and Trp(880) is essential for ASPD-NAKα3 interaction, because tetrapeptides mimicking this Ex4 region bound to the ASPD surface and blocked ASPD neurotoxicity. Our findings open up new possibilities for knowledge-based design of peptidomimetics that inhibit neurodegeneration in AD by blocking aberrant ASPD-NAKα3 interaction.
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19
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Nicholls DG, Brand MD, Gerencser AA. Mitochondrial bioenergetics and neuronal survival modelled in primary neuronal culture and isolated nerve terminals. J Bioenerg Biomembr 2014; 47:63-74. [DOI: 10.1007/s10863-014-9573-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 08/20/2014] [Indexed: 12/20/2022]
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20
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Yang S, Xia C, Li S, Du L, Zhang L, Zhou R. Defective mitophagy driven by dysregulation of rheb and KIF5B contributes to mitochondrial reactive oxygen species (ROS)-induced nod-like receptor 3 (NLRP3) dependent proinflammatory response and aggravates lipotoxicity. Redox Biol 2014; 3:63-71. [PMID: 25462067 PMCID: PMC4295565 DOI: 10.1016/j.redox.2014.04.001] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 04/05/2014] [Accepted: 04/07/2014] [Indexed: 01/07/2023] Open
Abstract
High-fat diet (HFD) and inflammation are the key
contributors to insulin resistance and type 2 diabetes (T2D). Previous study
shows fatty acid-induced accumulation of damaged, reactive oxygen species
(ROS)-generating mitochondria, and this in turn activates the NLRP3 inflammasome
interference with insulin signaling. Our previous research shows NLRP3
inflammasome activation signal originates from defects in autophagy. Yet how the
fatty acid related to mitophagy alteration leads to the activation of NLRP3-ASC
inflammasome has not been considered. Here we demonstrated that palmitate (PA)
induced mitophagy deficiency, leading to damaged mitochondrion as characterized
by mito-ROS production and loss of membrane potential. Antioxidant APDC or
Ca2+ signaling inhibitor Nifedipine blocked PA-induced
NLRP3 inflammasome activation. Further, we provided evidences that PA reduced
the expression of Ras homolog enriched in brain (Rheb) and disrupted Rheb
recruitment to the mitochondrial outer membrane. In addition, sustained PA
caused disassociation of kinesin family member 5B (KIF5B) from binding with
mitochondria via Ca2+-dependent effects. Disruption of Rheb and
KIF5B interaction with mitochondria blocked mitochondrial degradation along with
IL-1β dependent insulin resistance, which was majorly attenuated by Rheb/KIF5B
overexpression. In a consequence, defective mitophagy led to the accumulation of
damaged-ROS-generating mitochondria, down pathway of NLRP3-ASC-Caspase 1
activation, and subsequently, insulin resistance. These findings provide
insights into the association of inflammation, mitophagy and
T2D. PA induced disruption of KIF5B-mediated mitochondrial
motility and loss of Rheb-dependent mitophagy. Defective mitophagy led to NLRP3-ASC-Caspase 1
activation, and subsequently, insulin resistance. Antioxidant APDC or Ca2+ signaling
inhibitor nifidipine blocked PA-induced NLRP3 inflammasome
activation.
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Affiliation(s)
- Sijun Yang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China.
| | - Chunxiang Xia
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Shali Li
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Leilei Du
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Lu Zhang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
| | - Ronbin Zhou
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, Jiangsu Province 210046, China
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21
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Edelfosine and perifosine disrupt hepatic mitochondrial oxidative phosphorylation and induce the permeability transition. Mitochondrion 2012; 13:25-35. [PMID: 23164800 DOI: 10.1016/j.mito.2012.11.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Revised: 11/02/2012] [Accepted: 11/07/2012] [Indexed: 12/25/2022]
Abstract
Edelfosine and perifosine are alkylphospholipids that have been intensively studied as potential antitumor agents. Apoptotic cell death caused by these two compounds is mediated, at least in part, through mitochondria. Additionally, previous works demonstrated that edelfosine induces changes in mitochondrial membrane permeability that are somehow reduced by using cyclosporin A. Therefore, the objective of the present study was not only to confirm mitochondrial permeability transition but also identify direct effects of both ether lipids on mitochondrial hepatic fractions, namely on mitochondrial oxidative phosphorylation and generation of hydrogen peroxide (H(2)O(2)) through the respiratory chain. Results show that edelfosine and perifosine inhibit mitochondrial respiration and decrease transmembrane electric potential. However, despite these effects, edelfosine and perifosine were still able to induce mitochondrial permeability transition in non-energized mitochondria. Interestingly, edelfosine decreased H(2)O(2) production through the respiratory chain. In conclusion, the present work demonstrates previously unknown alterations of mitochondrial physiology directly induced by edelfosine and perifosine. The study is relevant in the understanding of mitochondrial-target effects of both compounds, as well as to acknowledge possible toxic responses in non-tumor organs.
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Hwang JY, Lee J, Lee C, Jakob A, Lemor R, Medina-Kauwe LK, Shung KK. Fluorescence response of human HER2+ cancer- and MCF-12F normal cells to 200MHz ultrasound microbeam stimulation: a preliminary study of membrane permeability variation. ULTRASONICS 2012; 52:803-8. [PMID: 22513260 PMCID: PMC3392461 DOI: 10.1016/j.ultras.2012.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Revised: 03/05/2012] [Accepted: 03/07/2012] [Indexed: 05/09/2023]
Abstract
Targeted mechanical cell stimulation has been extensively studied for a better understanding of its effect on cellular mechanotransduction signaling pathways and structures by utilizing a variety of mechanical sources. In this work, an ultrasound-driven single cell stimulation method is thus proposed, and a preliminary study is carried out by comparing the fluorescence intensities representing a change in cell membrane permeability between MDA-MB-435 human HER2+ cancer cells (∼40-50μm in diameter) and MCF-12F normal cells (∼50-60μm) in the presence of ultrasound. A 200MHz single element zinc oxide (ZnO) transducer is employed to generate ultrasound microbeam (UM) whose beamwidth and depth of focus are 9.5 and 60μm, comparable to typical cell size. The cells in tetramethyl rhodamine methyl ester (TMRM) are interrogated with 200MHz sinusoidal bursts. The number of cycles per burst is 5 and the pulse repetition frequency (PRF) is 1kHz. The temporal variation of fluorescence intensity in each cell is measured as a function of input voltage to the transducer (16, 32, and 47V), and its corresponding fluorescence images are obtained via a confocal microscope. A systematic method for visualizing UM's focus by adding Rhodamine B to the immersion medium is also proposed to enhance the precision in aiming the beam at an individual cell. Both types of cells exhibit a decrease in the intensity upon UM irradiation. In particular, normal cells show more fluorescence reduction (down to 0.7 in normalized intensity) than cancer cells (∼0.9) under the same excitation condition of the transducer. With UM being turned off, the normalized intensity level in normal cells is slowly increased to 1.1. The cell images taken before and after UM exposure indicate that the intensity reduction is more pronounced in those cells after exposure. Hence the results show the potential of UM as a non-invasive in vitro stimulation tool for facilitating targeted drug delivery and gene transfection as well as for studying cellular mechanotransduction.
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Affiliation(s)
- Jae Youn Hwang
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Jungwoo Lee
- Department of Electronic Engineering, Kwangwoon University, Seoul, Republic of Korea, 137-701
| | - Changyang Lee
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, USA
| | - Anette Jakob
- Fraunhofer IBMT for Biomedical Engineering, Division Ultrasound, St. Ingbert, Germany
| | - Robert Lemor
- Fraunhofer IBMT for Biomedical Engineering, Division Ultrasound, St. Ingbert, Germany
| | - Lali K. Medina-Kauwe
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
- Department of Medicine, University of California Los Angeles, Geffen School of Medicine, Los Angeles, CA 90048, USA
| | - K. Kirk Shung
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, USA
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23
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Fennessey CM, Ivie SE, McClain MS. Coenzyme depletion by members of the aerolysin family of pore-forming toxins leads to diminished ATP levels and cell death. MOLECULAR BIOSYSTEMS 2012; 8:2097-105. [PMID: 22688384 PMCID: PMC3759351 DOI: 10.1039/c2mb25142f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Recent studies demonstrated that a variety of bacterial pore-forming toxins induce cell death through a process of programmed necrosis characterized by the rapid depletion of cellular ATP. However, events leading to the necrosis and depletion of ATP are not thoroughly understood. We demonstrate that ATP-depletion induced by two pore-forming toxins, the Clostridium perfringens epsilon-toxin and the Aeromonas hydrophila aerolysin toxin, is associated with decreased mitochondrial membrane potential and opening of the mitochondrial permeability transition pore. To gain further insight into the toxin-induced metabolic changes contributing to necrosis and depletion of ATP, we analyzed the biochemical profiles of 251 distinct compounds by GC/MS or LC/MS/MS following exposure of a human kidney cell line to the epsilon-toxin. As expected, numerous biochemicals were seen to increase or decrease in response to epsilon-toxin. However, the pattern of these changes was consistent with the toxin-induced disruption of major energy-producing pathways in the cell including disruptions to the beta-oxidation of lipids. In particular, treatment with epsilon-toxin led to decreased levels of key coenzymes required for energy production including carnitine, NAD (and NADH), and coenzyme A. Independent biochemical assays confirmed that epsilon-toxin and aerolysin induced the rapid decrease of these coenzymes or their synthetic precursors. Incubation of cells with NADH or carnitine-enriched medium helped protect cells from toxin-induced ATP depletion and cell death. Collectively, these results demonstrate that members of the aerolysin family of pore-forming toxins lead to decreased levels of essential coenzymes required for energy production. The resulting loss of energy substrates is expected to contribute to dissipation of the mitochondrial membrane potential, opening of the mitochondrial permeability transition pore, and ultimately cell death.
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Affiliation(s)
- Christine M. Fennessey
- Division of Infectious Disease, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Susan E. Ivie
- Division of Infectious Disease, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Mark S. McClain
- Division of Infectious Disease, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
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Konrad C, Kiss G, Torocsik B, Adam-Vizi V, Chinopoulos C. Absence of Ca2+-induced mitochondrial permeability transition but presence of bongkrekate-sensitive nucleotide exchange in C. crangon and P. serratus. PLoS One 2012; 7:e39839. [PMID: 22768139 PMCID: PMC3387235 DOI: 10.1371/journal.pone.0039839] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Accepted: 05/28/2012] [Indexed: 12/22/2022] Open
Abstract
Mitochondria from the embryos of brine shrimp (Artemia franciscana) do not undergo Ca2+-induced permeability transition in the presence of a profound Ca2+ uptake capacity. Furthermore, this crustacean is the only organism known to exhibit bongkrekate-insensitive mitochondrial adenine nucleotide exchange, prompting the conjecture that refractoriness to bongkrekate and absence of Ca2+-induced permeability transition are somehow related phenomena. Here we report that mitochondria isolated from two other crustaceans, brown shrimp (Crangon crangon) and common prawn (Palaemon serratus) exhibited bongkrekate-sensitive mitochondrial adenine nucleotide transport, but lacked a Ca2+-induced permeability transition. Ca2+ uptake capacity was robust in the absence of adenine nucleotides in both crustaceans, unaffected by either bongkrekate or cyclosporin A. Transmission electron microscopy images of Ca2+-loaded mitochondria showed needle-like formations of electron-dense material strikingly similar to those observed in mitochondria from the hepatopancreas of blue crab (Callinectes sapidus) and the embryos of Artemia franciscana. Alignment analysis of the partial coding sequences of the adenine nucleotide translocase (ANT) expressed in Crangon crangon and Palaemon serratus versus the complete sequence expressed in Artemia franciscana reappraised the possibility of the 208-214 amino acid region for conferring sensitivity to bongkrekate. However, our findings suggest that the ability to undergo Ca2+-induced mitochondrial permeability transition and the sensitivity of adenine nucleotide translocase to bongkrekate are not necessarily related phenomena.
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Affiliation(s)
- Csaba Konrad
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary
| | - Gergely Kiss
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary
| | - Beata Torocsik
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary
| | - Vera Adam-Vizi
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary
| | - Christos Chinopoulos
- Department of Medical Biochemistry, Semmelweis University, Budapest, Hungary
- * E-mail:
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Galigniana NM, Ballmer LT, Toneatto J, Erlejman AG, Lagadari M, Galigniana MD. Regulation of the glucocorticoid response to stress-related disorders by the Hsp90-binding immunophilin FKBP51. J Neurochem 2012; 122:4-18. [DOI: 10.1111/j.1471-4159.2012.07775.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Chinopoulos C, Adam-Vizi V. Modulation of the mitochondrial permeability transition by cyclophilin D: moving closer to F(0)-F(1) ATP synthase? Mitochondrion 2012; 12:41-5. [PMID: 21586346 DOI: 10.1016/j.mito.2011.04.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2010] [Revised: 03/21/2011] [Accepted: 04/29/2011] [Indexed: 01/08/2023]
Abstract
Cyclophilin D was recently shown to mask an inhibitory site of the mitochondrial permeability transition pore (PTP) for phosphate, and to constitutively bind F(0)-F(1) ATP synthase resulting in the slowing of ATP synthesis and hydrolysis rates, thus regulating matrix adenine nucleotide levels. Here we review the striking similarities of the factors affecting the threshold for PTP induction, to those affecting binding of phosphate to formerly proposed sides on F(1)-ATPase affecting ATP hydrolytic activity, including critical arginine residues, matrix pH, [Mg(2+)], adenine nucleotides and proton motive force. Based on these similarities, we scrutinize the hypothesis that in depolarized mitochondria exhibiting reversal of F(0)-F(1) ATP synthase operation, the genetic ablation of cyclophilin D or its inhibition by cyclosporin A results in accelerated proton pumping by ATP hydrolysis, opposing a further decrease in membrane potential and promoting high matrix phosphate levels, both negatively affecting the probability of PTP opening.
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Affiliation(s)
- Christos Chinopoulos
- Department of Medical Biochemistry, Semmelweis University, Budapest 1094, Hungary
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