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Mollo N, Cicatiello R, Aurilia M, Scognamiglio R, Genesio R, Charalambous M, Paladino S, Conti A, Nitsch L, Izzo A. Targeting Mitochondrial Network Architecture in Down Syndrome and Aging. Int J Mol Sci 2020; 21:E3134. [PMID: 32365535 PMCID: PMC7247689 DOI: 10.3390/ijms21093134] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 04/26/2020] [Accepted: 04/27/2020] [Indexed: 12/12/2022] Open
Abstract
Mitochondria are organelles that mainly control energy conversion in the cell. In addition, they also participate in many relevant activities, such as the regulation of apoptosis and calcium levels, and other metabolic tasks, all closely linked to cell viability. Functionality of mitochondria appears to depend upon their network architecture that may dynamically pass from an interconnected structure with long tubular units, to a fragmented one with short separate fragments. A decline in mitochondrial quality, which presents itself as an altered structural organization and a function of mitochondria, has been observed in Down syndrome (DS), as well as in aging and in age-related pathologies. This review provides a basic overview of mitochondrial dynamics, from fission/fusion mechanisms to mitochondrial homeostasis. Molecular mechanisms determining the disruption of the mitochondrial phenotype in DS and aging are discussed. The impaired activity of the transcriptional co-activator PGC-1α/PPARGC1A and the hyperactivation of the mammalian target of rapamycin (mTOR) kinase are emerging as molecular underlying causes of these mitochondrial alterations. It is, therefore, likely that either stimulating the PGC-1α activity or inhibiting mTOR signaling could reverse mitochondrial dysfunction. Evidence is summarized suggesting that drugs targeting either these pathways or other factors affecting the mitochondrial network may represent therapeutic approaches to improve and/or prevent the effects of altered mitochondrial function. Overall, from all these studies it emerges that the implementation of such strategies may exert protective effects in DS and age-related diseases.
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Affiliation(s)
- Nunzia Mollo
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Rita Cicatiello
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Miriam Aurilia
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Roberta Scognamiglio
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Rita Genesio
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Maria Charalambous
- Institute of Experimental Endocrinology and Oncology “G. Salvatore”, National Research Council, 80131 Naples, Italy
| | - Simona Paladino
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Anna Conti
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Lucio Nitsch
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
- Institute of Experimental Endocrinology and Oncology “G. Salvatore”, National Research Council, 80131 Naples, Italy
| | - Antonella Izzo
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
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152
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De Rasmo D, Ferretta A, Russo S, Ruggieri M, Lasorella P, Paolicelli D, Trojano M, Signorile A. PBMC of Multiple Sclerosis Patients Show Deregulation of OPA1 Processing Associated with Increased ROS and PHB2 Protein Levels. Biomedicines 2020; 8:biomedicines8040085. [PMID: 32290388 PMCID: PMC7235786 DOI: 10.3390/biomedicines8040085] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 04/08/2020] [Accepted: 04/10/2020] [Indexed: 02/06/2023] Open
Abstract
Multiple sclerosis (MS) is an autoimmune disease in which activated lymphocytes affect the central nervous system. Increase of reactive oxygen species (ROS), impairment of mitochondria-mediated apoptosis and mitochondrial alterations have been reported in peripheral lymphocytes of MS patients. Mitochondria-mediated apoptosis is regulated by several mechanisms and proteins. Among others, optic atrophy 1 (OPA1) protein plays a key role in the regulating mitochondrial dynamics, cristae architecture and release of pro-apoptotic factors. Very interesting, mutations in OPA1 gene, have been associated with multiple sclerosis-like disorder. We have analyzed OPA1 and some factors involved in its regulation. Fifteen patients with MS and fifteen healthy control subjects (HC) were enrolled into the study and peripheral blood mononuclear cells (PBMCs) were isolated. H2O2 level was measured spectrofluorimetrically, OPA1, PHB2, SIRT3, and OMA1 were analyzed by western blotting. Statistical analysis was performed using Student's t-test. The results showed that PBMC of MS patients were characterized by a deregulation of OPA1 processing associated with increased H2O2 production, inactivation of OMA1 and increase of PHB2 protein level. The presented data suggest that the alteration of PHB2, OMA1, and OPA1 processing could be involved in resistance towards apoptosis. These molecular parameters could also be useful to assess disease activity.
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Affiliation(s)
- Domenico De Rasmo
- CNR-Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, 70126 Bari, Italy
- Correspondence: (D.D.R.); (A.S.); Tel.: +39-080-547-8529 (D.D.R. & A.S.)
| | - Anna Ferretta
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy; (A.F.); (S.R.); (M.R.); (P.L.); (D.P.); (M.T.)
| | - Silvia Russo
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy; (A.F.); (S.R.); (M.R.); (P.L.); (D.P.); (M.T.)
| | - Maddalena Ruggieri
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy; (A.F.); (S.R.); (M.R.); (P.L.); (D.P.); (M.T.)
| | - Piergiorgio Lasorella
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy; (A.F.); (S.R.); (M.R.); (P.L.); (D.P.); (M.T.)
| | - Damiano Paolicelli
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy; (A.F.); (S.R.); (M.R.); (P.L.); (D.P.); (M.T.)
| | - Maria Trojano
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy; (A.F.); (S.R.); (M.R.); (P.L.); (D.P.); (M.T.)
| | - Anna Signorile
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy; (A.F.); (S.R.); (M.R.); (P.L.); (D.P.); (M.T.)
- Correspondence: (D.D.R.); (A.S.); Tel.: +39-080-547-8529 (D.D.R. & A.S.)
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153
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Lee H, Smith SB, Sheu SS, Yoon Y. The short variant of optic atrophy 1 (OPA1) improves cell survival under oxidative stress. J Biol Chem 2020; 295:6543-6560. [PMID: 32245890 DOI: 10.1074/jbc.ra119.010983] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 03/31/2020] [Indexed: 01/23/2023] Open
Abstract
Optic atrophy 1 (OPA1) is a dynamin protein that mediates mitochondrial fusion at the inner membrane. OPA1 is also necessary for maintaining the cristae and thus essential for supporting cellular energetics. OPA1 exists as membrane-anchored long form (L-OPA1) and short form (S-OPA1) that lacks the transmembrane region and is generated by cleavage of L-OPA1. Mitochondrial dysfunction and cellular stresses activate the inner membrane-associated zinc metallopeptidase OMA1 that cleaves L-OPA1, causing S-OPA1 accumulation. The prevailing notion has been that L-OPA1 is the functional form, whereas S-OPA1 is an inactive cleavage product in mammals, and that stress-induced OPA1 cleavage causes mitochondrial fragmentation and sensitizes cells to death. However, S-OPA1 contains all functional domains of dynamin proteins, suggesting that it has a physiological role. Indeed, we recently demonstrated that S-OPA1 can maintain cristae and energetics through its GTPase activity, despite lacking fusion activity. Here, applying oxidant insult that induces OPA1 cleavage, we show that cells unable to generate S-OPA1 are more sensitive to this stress under obligatory respiratory conditions, leading to necrotic death. These findings indicate that L-OPA1 and S-OPA1 differ in maintaining mitochondrial function. Mechanistically, we found that cells that exclusively express L-OPA1 generate more superoxide and are more sensitive to Ca2+-induced mitochondrial permeability transition, suggesting that S-OPA1, and not L-OPA1, protects against cellular stress. Importantly, silencing of OMA1 expression increased oxidant-induced cell death, indicating that stress-induced OPA1 cleavage supports cell survival. Our findings suggest that S-OPA1 generation by OPA1 cleavage is a survival mechanism in stressed cells.
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Affiliation(s)
- Hakjoo Lee
- Department of Physiology, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| | - Sylvia B Smith
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, Augusta, Georgia 30912.,Culver Vision Discovery Institute, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| | - Shey-Shing Sheu
- Department of Medicine, Center for Translational Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
| | - Yisang Yoon
- Department of Physiology, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
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154
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Xie W, Jiao B, Bai Q, Ilin VA, Sun M, Burton CE, Kolodieznyi D, Calderon MJ, Stolz DB, Opresko PL, St Croix CM, Watkins S, Van Houten B, Bruchez MP, Burton EA. Chemoptogenetic ablation of neuronal mitochondria in vivo with spatiotemporal precision and controllable severity. eLife 2020; 9:e51845. [PMID: 32180546 PMCID: PMC7077989 DOI: 10.7554/elife.51845] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 02/10/2020] [Indexed: 12/16/2022] Open
Abstract
Mitochondrial dysfunction is implicated in the pathogenesis of multiple neurological diseases, but elucidation of underlying mechanisms is limited experimentally by the inability to damage specific mitochondria in defined neuronal groups. We developed a precision chemoptogenetic approach to target neuronal mitochondria in the intact nervous system in vivo. MG2I, a chemical fluorogen, produces singlet oxygen when bound to the fluorogen-activating protein dL5** and exposed to far-red light. Transgenic zebrafish expressing dL5** within neuronal mitochondria showed dramatic MG2I- and light-dependent neurobehavioral deficits, caused by neuronal bioenergetic crisis and acute neuronal depolarization. These abnormalities resulted from loss of neuronal respiration, associated with mitochondrial fragmentation, swelling and elimination of cristae. Remaining cellular ultrastructure was preserved initially, but cellular pathology downstream of mitochondrial damage eventually culminated in neuronal death. Our work provides powerful new chemoptogenetic tools for investigating mitochondrial homeostasis and pathophysiology and shows a direct relationship between mitochondrial function, neuronal biogenetics and whole-animal behavior.
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Affiliation(s)
- Wenting Xie
- Department of Neurology, University of PittsburghPittsburghUnited States
- Pittsburgh Institute for Neurodegenerative Diseases, University of PittsburghPittsburghUnited States
- Tsinghua University Medical SchoolBeijingChina
| | - Binxuan Jiao
- Department of Neurology, University of PittsburghPittsburghUnited States
- Pittsburgh Institute for Neurodegenerative Diseases, University of PittsburghPittsburghUnited States
- Tsinghua University Medical SchoolBeijingChina
| | - Qing Bai
- Department of Neurology, University of PittsburghPittsburghUnited States
- Pittsburgh Institute for Neurodegenerative Diseases, University of PittsburghPittsburghUnited States
| | - Vladimir A Ilin
- Department of Neurology, University of PittsburghPittsburghUnited States
- Pittsburgh Institute for Neurodegenerative Diseases, University of PittsburghPittsburghUnited States
| | - Ming Sun
- Center for Biologic Imaging, University of PittsburghPittsburghUnited States
| | | | - Dmytro Kolodieznyi
- Departments of Biological Sciences and Chemistry, Carnegie Mellon UniversityPittsburghUnited States
| | - Michael J Calderon
- Center for Biologic Imaging, University of PittsburghPittsburghUnited States
- Department of Cell Biology, University of PittsburghPittsburghUnited States
| | - Donna B Stolz
- Center for Biologic Imaging, University of PittsburghPittsburghUnited States
- Department of Cell Biology, University of PittsburghPittsburghUnited States
| | - Patricia L Opresko
- Department of Environmental and Occupational Health, University of PittsburghPittsburghUnited States
- Genome Stability Program, UPMC Hillman Cancer CenterPittsburghUnited States
| | - Claudette M St Croix
- Center for Biologic Imaging, University of PittsburghPittsburghUnited States
- Department of Cell Biology, University of PittsburghPittsburghUnited States
| | - Simon Watkins
- Center for Biologic Imaging, University of PittsburghPittsburghUnited States
- Department of Cell Biology, University of PittsburghPittsburghUnited States
| | - Bennett Van Houten
- Genome Stability Program, UPMC Hillman Cancer CenterPittsburghUnited States
- Department of Pharmacology and Chemical Biology, University of PittsburghPittsburghUnited States
| | - Marcel P Bruchez
- Departments of Biological Sciences and Chemistry, Carnegie Mellon UniversityPittsburghUnited States
- Molecular Biosensors and Imaging Center, Carnegie Mellon UniversityPittsburghUnited States
| | - Edward A Burton
- Department of Neurology, University of PittsburghPittsburghUnited States
- Pittsburgh Institute for Neurodegenerative Diseases, University of PittsburghPittsburghUnited States
- Geriatric Research, Education and Clinical Center, Pittsburgh VA Healthcare SystemPittsburghUnited States
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155
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Nakamura S, Matsui A, Akabane S, Tamura Y, Hatano A, Miyano Y, Omote H, Kajikawa M, Maenaka K, Moriyama Y, Endo T, Oka T. The mitochondrial inner membrane protein LETM1 modulates cristae organization through its LETM domain. Commun Biol 2020; 3:99. [PMID: 32139798 PMCID: PMC7058069 DOI: 10.1038/s42003-020-0832-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 02/17/2020] [Indexed: 11/26/2022] Open
Abstract
LETM1 is a mitochondrial inner membrane protein that is required for maintaining the mitochondrial morphology and cristae structures, and regulates mitochondrial ion homeostasis. Here we report a role of LETM1 in the organization of cristae structures. We identified four amino acid residues of human LETM1 that are crucial for complementation of the growth deficiency caused by gene deletion of a yeast LETM1 orthologue. Substituting amino acid residues with alanine disrupts the correct assembly of a protein complex containing LETM1 and prevents changes in the mitochondrial morphology induced by exogenous LETM1 expression. Moreover, the LETM1 protein changes the shapes of the membranes of in vitro-reconstituted proteoliposomes, leading to the formation of invaginated membrane structures on artificial liposomes. LETM1 mutant proteins with alanine substitutions fail to facilitate the formation of invaginated membrane structures, suggesting that LETM1 plays a fundamental role in the organization of mitochondrial membrane morphology. Nakamura et al find that the mitochondrial protein LETM1 can directly modulate membrane structure in vitro and identify a conserved domain involved in modulating mitochondrial membrane morphology. This study enhances our understanding of how mitochondrial cristae are organised.
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Affiliation(s)
- Seiko Nakamura
- Department of Molecular Biology, Graduate School of Medical Science, Kyushu University, Fukuoka, 812-8582, Japan
| | - Aiko Matsui
- Department of Life Science, Rikkyo University, Tokyo, 171-8501, Japan
| | - Shiori Akabane
- Department of Life Science, Rikkyo University, Tokyo, 171-8501, Japan
| | - Yasushi Tamura
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, Yamagata, 990-8560, Japan
| | - Azumi Hatano
- Department of Life Science, Rikkyo University, Tokyo, 171-8501, Japan
| | - Yuriko Miyano
- Department of Life Science, Rikkyo University, Tokyo, 171-8501, Japan
| | - Hiroshi Omote
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, 700-8530, Japan
| | - Mizuho Kajikawa
- Laboratory for Infectious Immunity, RIKEN Research Center for Allergy and Immunology, Kanagawa, 230-0045, Japan
| | - Katsumi Maenaka
- Laboratory of Biomolecular Science, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Yoshinori Moriyama
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, 700-8530, Japan
| | - Toshiya Endo
- Faculty of Life Sciences, Kyoto Sangyo University, Kyoto, 603-8555, Japan
| | - Toshihiko Oka
- Department of Life Science, Rikkyo University, Tokyo, 171-8501, Japan.
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156
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Lactate dehydrogenase inhibition synergizes with IL-21 to promote CD8 + T cell stemness and antitumor immunity. Proc Natl Acad Sci U S A 2020; 117:6047-6055. [PMID: 32123114 DOI: 10.1073/pnas.1920413117] [Citation(s) in RCA: 133] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Interleukin (IL)-2 and IL-21 dichotomously shape CD8+ T cell differentiation. IL-2 drives terminal differentiation, generating cells that are poorly effective against tumors, whereas IL-21 promotes stem cell memory T cells (TSCM) and antitumor responses. Here we investigated the role of metabolic programming in the developmental differences induced by these cytokines. IL-2 promoted effector-like metabolism and aerobic glycolysis, robustly inducing lactate dehydrogenase (LDH) and lactate production, whereas IL-21 maintained a metabolically quiescent state dependent on oxidative phosphorylation. LDH inhibition rewired IL-2-induced effects, promoting pyruvate entry into the tricarboxylic acid cycle and inhibiting terminal effector and exhaustion programs, including mRNA expression of members of the NR4A family of nuclear receptors, as well as Prdm1 and Xbp1 While deletion of Ldha prevented development of cells with antitumor effector function, transient LDH inhibition enhanced the generation of memory cells capable of triggering robust antitumor responses after adoptive transfer. LDH inhibition did not significantly affect IL-21-induced metabolism but caused major transcriptomic changes, including the suppression of IL-21-induced exhaustion markers LAG3, PD1, 2B4, and TIM3. LDH inhibition combined with IL-21 increased the formation of TSCM cells, resulting in more profound antitumor responses and prolonged host survival. These findings indicate a pivotal role for LDH in modulating cytokine-mediated T cell differentiation and underscore the therapeutic potential of transiently inhibiting LDH during adoptive T cell-based immunotherapy, with an unanticipated cooperative antitumor effect of LDH inhibition and IL-21.
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157
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Makrecka‐Kuka M, Liepinsh E, Murray AJ, Lemieux H, Dambrova M, Tepp K, Puurand M, Käämbre T, Han WH, Goede P, O'Brien KA, Turan B, Tuncay E, Olgar Y, Rolo AP, Palmeira CM, Boardman NT, Wüst RCI, Larsen TS. Altered mitochondrial metabolism in the insulin-resistant heart. Acta Physiol (Oxf) 2020; 228:e13430. [PMID: 31840389 DOI: 10.1111/apha.13430] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 12/05/2019] [Accepted: 12/06/2019] [Indexed: 12/12/2022]
Abstract
Obesity-induced insulin resistance and type 2 diabetes mellitus can ultimately result in various complications, including diabetic cardiomyopathy. In this case, cardiac dysfunction is characterized by metabolic disturbances such as impaired glucose oxidation and an increased reliance on fatty acid (FA) oxidation. Mitochondrial dysfunction has often been associated with the altered metabolic function in the diabetic heart, and may result from FA-induced lipotoxicity and uncoupling of oxidative phosphorylation. In this review, we address the metabolic changes in the diabetic heart, focusing on the loss of metabolic flexibility and cardiac mitochondrial function. We consider the alterations observed in mitochondrial substrate utilization, bioenergetics and dynamics, and highlight new areas of research which may improve our understanding of the cause and effect of cardiac mitochondrial dysfunction in diabetes. Finally, we explore how lifestyle (nutrition and exercise) and pharmacological interventions can prevent and treat metabolic and mitochondrial dysfunction in diabetes.
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Affiliation(s)
| | | | - Andrew J. Murray
- Department of Physiology, Development and Neuroscience University of Cambridge Cambridge UK
| | - Hélène Lemieux
- Department of Medicine Faculty Saint‐Jean, Women and Children's Health Research Institute University of Alberta Edmonton AB Canada
| | | | - Kersti Tepp
- National Institute of Chemical Physics and Biophysics Tallinn Estonia
| | - Marju Puurand
- National Institute of Chemical Physics and Biophysics Tallinn Estonia
| | - Tuuli Käämbre
- National Institute of Chemical Physics and Biophysics Tallinn Estonia
| | - Woo H. Han
- Faculty Saint‐Jean University of Alberta Edmonton AB Canada
| | - Paul Goede
- Laboratory of Endocrinology Amsterdam Gastroenterology & Metabolism Amsterdam University Medical Center University of Amsterdam Amsterdam The Netherlands
| | - Katie A. O'Brien
- Department of Physiology, Development and Neuroscience University of Cambridge Cambridge UK
| | - Belma Turan
- Laboratory of Endocrinology Amsterdam Gastroenterology & Metabolism Amsterdam University Medical Center University of Amsterdam Amsterdam The Netherlands
| | - Erkan Tuncay
- Department of Biophysics Faculty of Medicine Ankara University Ankara Turkey
| | - Yusuf Olgar
- Department of Biophysics Faculty of Medicine Ankara University Ankara Turkey
| | - Anabela P. Rolo
- Department of Life Sciences University of Coimbra and Center for Neurosciences and Cell Biology University of Coimbra Coimbra Portugal
| | - Carlos M. Palmeira
- Department of Life Sciences University of Coimbra and Center for Neurosciences and Cell Biology University of Coimbra Coimbra Portugal
| | - Neoma T. Boardman
- Cardiovascular Research Group Department of Medical Biology UiT the Arctic University of Norway Tromso Norway
| | - Rob C. I. Wüst
- Laboratory for Myology Department of Human Movement Sciences Faculty of Behavioural and Movement Sciences Amsterdam Movement Sciences Vrije Universiteit Amsterdam Amsterdam The Netherlands
| | - Terje S. Larsen
- Cardiovascular Research Group Department of Medical Biology UiT the Arctic University of Norway Tromso Norway
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158
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Abstract
Owing to their ability to efficiently generate ATP required to sustain normal cell function, mitochondria are often considered the 'powerhouses of the cell'. However, our understanding of the role of mitochondria in cell biology recently expanded when we recognized that they are key platforms for a plethora of cell signalling cascades. This functional versatility is tightly coupled to constant reshaping of the cellular mitochondrial network in a series of processes, collectively referred to as mitochondrial membrane dynamics and involving organelle fusion and fission (division) as well as ultrastructural remodelling of the membrane. Accordingly, mitochondrial dynamics influence and often orchestrate not only metabolism but also complex cell signalling events, such as those involved in regulating cell pluripotency, division, differentiation, senescence and death. Reciprocally, mitochondrial membrane dynamics are extensively regulated by post-translational modifications of its machinery and by the formation of membrane contact sites between mitochondria and other organelles, both of which have the capacity to integrate inputs from various pathways. Here, we discuss mitochondrial membrane dynamics and their regulation and describe how bioenergetics and cellular signalling are linked to these dynamic changes of mitochondrial morphology.
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159
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Wang K, Liu Z, Zhao M, Zhang F, Wang K, Feng N, Fu F, Li J, Li J, Liu Y, Zhang S, Fan R, Guo H, Pei J. κ-opioid receptor activation promotes mitochondrial fusion and enhances myocardial resistance to ischemia and reperfusion injury via STAT3-OPA1 pathway. Eur J Pharmacol 2020; 874:172987. [PMID: 32032598 DOI: 10.1016/j.ejphar.2020.172987] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/31/2020] [Accepted: 02/03/2020] [Indexed: 12/19/2022]
Abstract
Mitochondrial dynamics, determining mitochondrial morphology, quality and abundance, have recently been implicated in myocardial ischemia and reperfusion (MI/R) injury. The roles of κ-opioid receptor activation in cardioprotection have been confirmed in our previous studies, while the underlying mechanism associated with mitochondrial dynamics remains unclear. This study aims to investigate the effect of κ-opioid receptor activation on the pathogenesis of MI/R and its underlying mechanisms. MI/R mouse model and hypoxia-reoxygenation cardiomyocyte model were established in this study. Mitochondrial dynamics were analyzed with transmission electron microscopy in vivo and confocal microscopy in vitro. STAT3 phosphorylation and OPA1 expression were detected by Western blotting. We show here that κ-opioid receptor activation with its selective receptor agonist U50,488H promoted mitochondrial fusion and enhanced myocardial resistance to MI/R injury, while these protective effects were blockaded by nor-BNI, a selective κ-opioid receptor antagonist. In addition, κ-opioid receptor activation increased STAT3 phosphorylation and OPA1 expression, which were blockaded by nor-BNI. Furthermore, inhibition of STAT3 phosphorylation by stattic, a specific STAT3 inhibitor, repressed the effects of κ-opioid receptor activation on promoting OPA1 expression and mitochondrial fusion, as well as inhibiting cell apoptosis and oxidative stress both in vivo and in vitro during MI/R injury. Overall, our data for the first time provide evidence that κ-opioid receptor activation promotes mitochondrial fusion and enhances myocardial resistance to MI/R injury via STAT3-OPA1 pathway. Targeting the pathway regulated by κ-opioid receptor activation may be a potential therapeutic strategy for MI/R injury.
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Affiliation(s)
- Kaiyan Wang
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Zhenhua Liu
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Meina Zhao
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Fuyang Zhang
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Kai Wang
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Na Feng
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Feng Fu
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Jun Li
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Juan Li
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Yali Liu
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Shumiao Zhang
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Rong Fan
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Haitao Guo
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
| | - Jianming Pei
- Department of Physiology and Pathophysiology, National Key Discipline of Cell Biology, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
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160
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Andreone BJ, Larhammar M, Lewcock JW. Cell Death and Neurodegeneration. Cold Spring Harb Perspect Biol 2020; 12:cshperspect.a036434. [PMID: 31451511 DOI: 10.1101/cshperspect.a036434] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Neurodegenerative disease is characterized by the progressive deterioration of neuronal function caused by the degeneration of synapses, axons, and ultimately the death of nerve cells. An increased understanding of the mechanisms underlying altered cellular homeostasis and neurodegeneration is critical to the development of effective treatments for disease. Here, we review what is known about neuronal cell death and how it relates to our understanding of neurodegenerative disease pathology. First, we discuss prominent molecular signaling pathways that drive neuronal loss, and highlight the upstream cell biology underlying their activation. We then address how neuronal death may occur during disease in response to neuron intrinsic and extrinsic stressors. An improved understanding of the molecular mechanisms underlying neuronal dysfunction and cell death will open up avenues for clinical intervention in a field lacking disease-modifying treatments.
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Human Cytomegalovirus Alters Host Cell Mitochondrial Function during Acute Infection. J Virol 2020; 94:JVI.01183-19. [PMID: 31694945 DOI: 10.1128/jvi.01183-19] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 10/20/2019] [Indexed: 01/01/2023] Open
Abstract
Human cytomegalovirus (HCMV) is a large DNA herpesvirus that is highly prevalent in the human population. HCMV can result in severe direct and indirect pathologies under immunosuppressed conditions and is the leading cause of birth defects related to infectious disease. Currently, the effect of HCMV infection on host cell metabolism as an increase in glycolysis during infection has been defined. We have observed that oxidative phosphorylation is also increased. We have identified morphological and functional changes to host mitochondria during HCMV infection. The mitochondrial network undergoes fission events after HCMV infection. Interestingly, the network does not undergo fusion. At the same time, mitochondrial mass and membrane potential increase. The electron transport chain (ETC) functions at an elevated rate, resulting in the release of increased reactive oxygen species. Surprisingly, despite the stress applied to the host mitochondria, the network is capable of responding to and meeting the increased bioenergetic and biosynthetic demands placed on it. When mitochondrial DNA is depleted from the cells, we observed severe impairment of viral replication. Mitochondrial DNA encodes many of the ETC components. These findings suggest that the host cell ETC is essential to HCMV replication. Our studies suggest the host cell mitochondria may be a therapeutic target.IMPORTANCE Human cytomegalovirus (HCMV) is a herpesvirus present in up to 85% of some populations. Like all herpesviruses, HCMV infection is for life. No vaccine is currently available, neutralizing antibody therapies are ineffective, and current antivirals have limited long-term efficacy due to side effects and potential for viral mutation and resistance. The significance of this research is in understanding how HCMV manipulates the host mitochondria to support bioenergetic and biosynthetic requirements for replication. Despite a large genome, HCMV relies exclusively on host cells for metabolic functions. By understanding the dependency of HCMV on the mitochondria, we could exploit these requirements and develop novel antivirals.
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Li M, Wang L, Wang Y, Zhang S, Zhou G, Lieshout R, Ma B, Liu J, Qu C, Verstegen MMA, Sprengers D, Kwekkeboom J, van der Laan LJW, Cao W, Peppelenbosch MP, Pan Q. Mitochondrial Fusion Via OPA1 and MFN1 Supports Liver Tumor Cell Metabolism and Growth. Cells 2020; 9:cells9010121. [PMID: 31947947 PMCID: PMC7017104 DOI: 10.3390/cells9010121] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 01/02/2020] [Indexed: 12/24/2022] Open
Abstract
Metabolic reprogramming universally occurs in cancer. Mitochondria act as the hubs of bioenergetics and metabolism. The morphodynamics of mitochondria, comprised of fusion and fission processes, are closely associated with mitochondrial functions and are often dysregulated in cancer. In this study, we aim to investigate the mitochondrial morphodynamics and its functional consequences in human liver cancer. We observed excessive activation of mitochondrial fusion in tumor tissues from hepatocellular carcinoma (HCC) patients and in vitro cultured tumor organoids from cholangiocarcinoma (CCA). The knockdown of the fusion regulator genes, OPA1 (Optic atrophy 1) or MFN1 (Mitofusin 1), inhibited the fusion process in HCC cell lines and CCA tumor organoids. This resulted in inhibition of cell growth in vitro and tumor formation in vivo, after tumor cell engraftment in mice. This inhibitory effect is associated with the induction of cell apoptosis, but not related to cell cycle arrest. Genome-wide transcriptomic profiling revealed that the inhibition of fusion predominately affected cellular metabolic pathways. This was further confirmed by the blocking of mitochondrial fusion which attenuated oxygen consumption and cellular ATP production of tumor cells. In conclusion, increased mitochondrial fusion in liver cancer alters metabolism and fuels tumor cell growth.
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Affiliation(s)
- Meng Li
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Ling Wang
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Yijin Wang
- Department of Pathology and Hepatology, Beijing 302 Hospital, Beijing 100039, China;
| | - Shaoshi Zhang
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Guoying Zhou
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Ruby Lieshout
- Department of Surgery, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (R.L.); (M.M.A.V.); (L.J.W.v.d.L.)
| | - Buyun Ma
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Jiaye Liu
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Changbo Qu
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Monique M. A. Verstegen
- Department of Surgery, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (R.L.); (M.M.A.V.); (L.J.W.v.d.L.)
| | - Dave Sprengers
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Jaap Kwekkeboom
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Luc J. W. van der Laan
- Department of Surgery, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (R.L.); (M.M.A.V.); (L.J.W.v.d.L.)
| | - Wanlu Cao
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Maikel P. Peppelenbosch
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
| | - Qiuwei Pan
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, 3015 CE Rotterdam, The Netherlands; (M.L.); (L.W.); (S.Z.); (G.Z.); (B.M.); (J.L.); (C.Q.); (D.S.); (J.K.); (W.C.); (M.P.P.)
- Correspondence: ; Tel.: +31-107037502
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Rochford G, Molphy Z, Kavanagh K, McCann M, Devereux M, Kellett A, Howe O. Cu(ii) phenanthroline–phenazine complexes dysregulate mitochondrial function and stimulate apoptosis. Metallomics 2020; 12:65-78. [DOI: 10.1039/c9mt00187e] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Herein we report the central role of the mitochondria in the cytotoxicity of four developmental cytotoxic copper(ii) complexes [Cu(phen)2]2+, [Cu(DPQ)(Phen)]2+, [Cu(DPPZ)(Phen)]2+and [Cu(DPPN)(Phen)]2+superior to cisplatin and independent of resistance in a range of cells.
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Affiliation(s)
- Garret Rochford
- FOCAS Research Institute and School of Biological & Health Sciences
- Technological University Dublin
- Dublin 8
- Ireland
| | - Zara Molphy
- School of Chemical Science and The National Institute for Cellular Biotechnology
- Dublin City University
- Dublin 9
- Ireland
| | | | - Malachy McCann
- Department of Chemistry
- Maynooth University
- Maynooth
- Ireland
| | - Michael Devereux
- FOCAS Research Institute and School of Biological & Health Sciences
- Technological University Dublin
- Dublin 8
- Ireland
| | - Andrew Kellett
- School of Chemical Science and The National Institute for Cellular Biotechnology
- Dublin City University
- Dublin 9
- Ireland
| | - Orla Howe
- FOCAS Research Institute and School of Biological & Health Sciences
- Technological University Dublin
- Dublin 8
- Ireland
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164
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Martínez J, Marmisolle I, Tarallo D, Quijano C. Mitochondrial Bioenergetics and Dynamics in Secretion Processes. Front Endocrinol (Lausanne) 2020; 11:319. [PMID: 32528413 PMCID: PMC7256191 DOI: 10.3389/fendo.2020.00319] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 04/27/2020] [Indexed: 12/12/2022] Open
Abstract
Secretion is an energy consuming process that plays a relevant role in cell communication and adaptation to the environment. Among others, endocrine cells producing hormones, immune cells producing cytokines or antibodies, neurons releasing neurotransmitters at synapsis, and more recently acknowledged, senescent cells synthesizing and secreting multiple cytokines, growth factors and proteases, require energy to successfully accomplish the different stages of the secretion process. Calcium ions (Ca2+) act as second messengers regulating secretion in many of these cases. In this setting, mitochondria appear as key players providing ATP by oxidative phosphorylation, buffering Ca2+ concentrations and acting as structural platforms. These tasks also require the concerted actions of the mitochondrial dynamics machinery. These proteins mediate mitochondrial fusion and fission, and are also required for transport and tethering of mitochondria to cellular organelles where the different steps of the secretion process take place. Herein we present a brief overview of mitochondrial energy metabolism, mitochondrial dynamics, and the different steps of the secretion processes, along with evidence of the interaction between these pathways. We also analyze the role of mitochondria in secretion by different cell types in physiological and pathological settings.
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165
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OPA1 regulates respiratory supercomplexes assembly: The role of mitochondrial swelling. Mitochondrion 2019; 51:30-39. [PMID: 31870826 DOI: 10.1016/j.mito.2019.11.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 10/08/2019] [Accepted: 11/22/2019] [Indexed: 12/30/2022]
Abstract
Optic atrophy type 1 protein (OPA1), a dynamin-related GTPase, that, in addition to mitochondrial fusion, plays an important role in maintaining the structural organization and integrity of the inner mitochondrial membrane (IMM). OPA1 exists in two forms: IMM-bound long-OPA1 (L-OPA1) and soluble short-OPA1 (S-OPA1), a product of L-OPA1 proteolytic cleavage localized in the intermembrane space. In addition to OPA1, the structural and functional integrity of IMM can be regulated by changes in the matrix volume due to the opening/closure of permeability transition pores (PTP). Herein, we investigated the crosstalk between the PTP and OPA1 to clarify whether PTP opening is involved in OPA1-mediated regulation of respiratory chain supercomplexes (RCS) assembly using cardiac mitochondria and cell line. We found that: 1) Proteolytic cleavage of L-OPA1 is stimulated by PTP-induced mitochondrial swelling, 2) OPA1 knockdown reduces PTP-induced mitochondrial swelling but enhances ROS production, 3) OPA1 deficiency impairs the RCS assembly associated with diminished ETC activity and oxidative phosphorylation, 4) OPA1 has no physical interaction with phospholipid scramblase 3 although OPA1 downregulation increases expression of the scramblase. Thus, this study demonstrates that L-OPA1 cleavage depends on the PTP-induced mitochondrial swelling suggesting a regulatory role of the PTP-OPA1 axis in RCS assembly and mitochondrial bioenergetics.
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166
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Khacho M, Harris R, Slack RS. Mitochondria as central regulators of neural stem cell fate and cognitive function. Nat Rev Neurosci 2019; 20:34-48. [PMID: 30464208 DOI: 10.1038/s41583-018-0091-3] [Citation(s) in RCA: 217] [Impact Index Per Article: 43.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Emerging evidence now indicates that mitochondria are central regulators of neural stem cell (NSC) fate decisions and are crucial for both neurodevelopment and adult neurogenesis, which in turn contribute to cognitive processes in the mature brain. Inherited mutations and accumulated damage to mitochondria over the course of ageing serve as key factors underlying cognitive defects in neurodevelopmental disorders and neurodegenerative diseases, respectively. In this Review, we explore the recent findings that implicate mitochondria as crucial regulators of NSC function and cognition. In this respect, mitochondria may serve as targets for stem-cell-based therapies and interventions for cognitive defects.
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Affiliation(s)
- Mireille Khacho
- Department of Biochemistry, Microbiology and Immunology, Ottawa Institute of Systems Biology (OISB), University of Ottawa, Ottawa, Ontario, Canada
| | - Richard Harris
- Department of Cellular and Molecular Medicine, University of Ottawa Brain and Mind Research Institute, Ottawa, Ontario, Canada
| | - Ruth S Slack
- Department of Cellular and Molecular Medicine, University of Ottawa Brain and Mind Research Institute, Ottawa, Ontario, Canada.
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167
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Inhibitor 1 of Protein Phosphatase 1 Regulates Ca 2+/Calmodulin-Dependent Protein Kinase II to Alleviate Oxidative Stress in Hypoxia-Reoxygenation Injury of Cardiomyocytes. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:2193019. [PMID: 31885777 PMCID: PMC6925801 DOI: 10.1155/2019/2193019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 09/20/2019] [Accepted: 11/13/2019] [Indexed: 12/14/2022]
Abstract
Ca2+/calmodulin-dependent protein kinase II (CaMKII), regulated by inhibitor 1 of protein phosphatase 1 (I1PP1), is vital for maintaining cardiovascular homeostasis. However, the role and mechanism of I1PP1 against hypoxia-reoxygenation (H/R) injury in cardiomyocytes remain a question. In our study, after I1PP1 overexpression by adenovirus infection in the neonatal cardiomyocytes followed by hypoxia for 4 h and reoxygenation for 12 h, the CaMKIIδ alternative splicing subtype, ATP content, and lactate dehydrogenase (LDH) release were determined. CaMKII activity was evaluated by phosphoprotein phosphorylation at Thr17 (p-PLB Thr17), CaMKII phosphorylation (p-CaMKII), and CaMKII oxidation (ox-CaMKII). Reactive oxygen species (ROS), mitochondrial membrane potential, dynamin-related protein 1 (DRP1), and optic atrophy 1 (OPA1) expressions were assessed. Our study verified that I1PP1 overexpression attenuated the CaMKIIδ alternative splicing disorder; suppressed PLB phosphorylation at Thr17, p-CaMKII, and ox-CaMKII; decreased cell LDH release; increased ATP content; attenuated ROS production; increased mitochondrial membrane potential; and decreased DRP1 expression but increased OPA1 expression in the cardiomyocytes after H/R. Contrarily, CaMKIIδ alternative splicing disorder, LDH release, ATP reduction, and ROS accumulation were aggravated after H/R injury with the I1PP1 knockdown. Collectively, I1PP1 overexpression corrected disorders of CaMKIIδ alternative splicing, inhibited CaMKII phosphorylation, repressed CaMKII oxidation, suppressed ROS production, and attenuated cardiomyocyte H/R injury.
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168
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McMurray F, MacFarlane M, Kim K, Patten DA, Wei-LaPierre L, Fullerton MD, Harper ME. Maternal diet–induced obesity alters muscle mitochondrial function in offspring without changing insulin sensitivity. FASEB J 2019; 33:13515-13526. [DOI: 10.1096/fj.201901150r] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Fiona McMurray
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Ottawa Institute of Systems Biology, Ottawa, Ontario, Canada
| | - Megan MacFarlane
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Kijoo Kim
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - David A. Patten
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Ottawa Institute of Systems Biology, Ottawa, Ontario, Canada
| | - Lan Wei-LaPierre
- Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
| | - Morgan D. Fullerton
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Mary-Ellen Harper
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Ottawa Institute of Systems Biology, Ottawa, Ontario, Canada
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169
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The behavioural and pathophysiological effects of the ketogenic diet on mild traumatic brain injury in adolescent rats. Behav Brain Res 2019; 376:112225. [DOI: 10.1016/j.bbr.2019.112225] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 08/16/2019] [Accepted: 09/09/2019] [Indexed: 02/07/2023]
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170
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Salewskij K, Rieger B, Hager F, Arroum T, Duwe P, Villalta J, Colgiati S, Richter CP, Psathaki OE, Enriquez JA, Dellmann T, Busch KB. The spatio-temporal organization of mitochondrial F 1F O ATP synthase in cristae depends on its activity mode. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2019; 1861:148091. [PMID: 31669489 DOI: 10.1016/j.bbabio.2019.148091] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 10/02/2019] [Accepted: 10/18/2019] [Indexed: 12/11/2022]
Abstract
F1FO ATP synthase, also known as complex V, is a key enzyme of mitochondrial energy metabolism that can synthesize and hydrolyze ATP. It is not known whether the ATP synthase and ATPase function are correlated with a different spatio-temporal organisation of the enzyme. In order to analyze this, we tracked and localized single ATP synthase molecules in situ using live cell microscopy. Under normal conditions, complex V was mainly restricted to cristae indicated by orthogonal trajectories along the cristae membranes. In addition confined trajectories that are quasi immobile exist. By inhibiting glycolysis with 2-DG, the activity and mobility of complex V was altered. The distinct cristae-related orthogonal trajectories of complex V were obliterated. Moreover, a mobile subpopulation of complex V was found in the inner boundary membrane. The observed changes in the ratio of dimeric/monomeric complex V, respectively less mobile/more mobile complex V and its activity changes were reversible. In IF1-KO cells, in which ATP hydrolysis is not inhibited by IF1, complex V was more mobile, while inhibition of ATP hydrolysis by BMS-199264 reduced the mobility of complex V. Taken together, these data support the existence of different subpopulations of complex V, ATP synthase and ATP hydrolase, the latter with higher mobility and probably not prevailing at the cristae edges. Obviously, complex V reacts quickly and reversibly to metabolic conditions, not only by functional, but also by spatial and structural reorganization.
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Affiliation(s)
- Kirill Salewskij
- University Münster, Department of Biology, Institute of Molecular Cell Biology, 48149 Münster, North Rhine-Westphalia, Germany
| | - Bettina Rieger
- University Münster, Department of Biology, Institute of Molecular Cell Biology, 48149 Münster, North Rhine-Westphalia, Germany
| | - Frances Hager
- University Münster, Department of Biology, Institute of Molecular Cell Biology, 48149 Münster, North Rhine-Westphalia, Germany
| | - Tasnim Arroum
- University Münster, Department of Biology, Institute of Molecular Cell Biology, 48149 Münster, North Rhine-Westphalia, Germany
| | - Patrick Duwe
- University Münster, Department of Biology, Institute of Molecular Cell Biology, 48149 Münster, North Rhine-Westphalia, Germany
| | - Jimmy Villalta
- University Münster, Department of Biology, Institute of Molecular Cell Biology, 48149 Münster, North Rhine-Westphalia, Germany
| | - Sara Colgiati
- Centro Nacional de Investigaciones Cardiovasculares Carlos III, 28029 Madrid, Catania, Spain; Institute of Nutrition and Food Technology, Biomedical Research Centre, Department of Physiology, University of Granada, Granada, Andalusia, Spain
| | - Christian P Richter
- University of Osnabrück, School of Biology, University of Osnabrück, 49076 Osnabrück, Lower Saxony, Germany; Center of Cellular Nanoanalytics, Integrated Bioimaging Facility, University of Osnabrück, 49076 Osnabrück, Lower Saxony, Germany
| | - Olympia E Psathaki
- University of Osnabrück, School of Biology, University of Osnabrück, 49076 Osnabrück, Lower Saxony, Germany; Center of Cellular Nanoanalytics, Integrated Bioimaging Facility, University of Osnabrück, 49076 Osnabrück, Lower Saxony, Germany
| | - José A Enriquez
- Centro Nacional de Investigaciones Cardiovasculares Carlos III, 28029 Madrid, Catania, Spain
| | - Timo Dellmann
- University Münster, Department of Biology, Institute of Molecular Cell Biology, 48149 Münster, North Rhine-Westphalia, Germany
| | - Karin B Busch
- University Münster, Department of Biology, Institute of Molecular Cell Biology, 48149 Münster, North Rhine-Westphalia, Germany.
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171
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The Role of Cardiolipin and Mitochondrial Damage in Kidney Transplant. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:3836186. [PMID: 31885786 PMCID: PMC6899302 DOI: 10.1155/2019/3836186] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 08/27/2019] [Accepted: 09/11/2019] [Indexed: 02/06/2023]
Abstract
Chronic kidney disease (CKD) is highly incident and prevalent in the world. The death of patients with CKD is primarily due to cardiovascular disease. Renal transplantation (RT) emerges as the best management alternative for patients with CKD. However, the incidence of acute renal graft dysfunction is 11.8% of the related living donor and 17.4% of the cadaveric donor. Anticardiolipin antibodies (ACAs) or antiphospholipid antibodies (APAs) are important risk factors for acute renal graft dysfunction. The determination of ACA or APA to candidates for RT could serve as prognostic markers of early graft failure and would indicate which patients could benefit from anticoagulant therapy. Cardiolipin is a fundamental molecule that plays an important role in the adequate conformation of the mitochondrial cristae and the correct assembly of the mitochondrial respiratory supercomplexes and other proteins essential for proper mitochondrial function. Cardiolipin undergoes a nonrandom oxidation process by having pronounced specificity unrelated to the polyunsaturation pattern of its acyl groups. Accumulation of hydroxyl derivatives and cardiolipin hydroperoxides has been observed in the affected tissues, and recent studies showed that oxidation of cardiolipin is carried out by a cardiolipin-specific peroxidase activity of cardiolipin-bound cytochrome c. Cardiolipin could be responsible for the proapoptotic production of death signals. Cardiolipin modulates the production of energy and participates in inflammation, mitophagy, and cellular apoptosis. The determination of cardiolipin or its antibodies is an attractive therapeutic, diagnostic target in RT and kidney diseases.
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172
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Quintana-Cabrera R, Soriano ME. ER Stress Priming of Mitochondrial Respiratory suPERKomplex Assembly. Trends Endocrinol Metab 2019; 30:685-687. [PMID: 31455568 DOI: 10.1016/j.tem.2019.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 08/06/2019] [Indexed: 12/13/2022]
Abstract
Assembly factors are necessary for the formation of mitochondrial supercomplexes (SCs) and in making cellular respiration more efficient. In a recent study, Balsa et al. (Mol. Cell, 2019) report that nutrient-induced endoplasmic reticulum (ER) stress engages PERK-eIF2α-mediated transcription of the SCs assembly factor SCAF1, events that coordinate ER stress and SCs formation to improve bioenergetics.
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Affiliation(s)
- Ruben Quintana-Cabrera
- Institute of Functional Biology and Genomics, University of Salamanca, 37007 Salamanca, Spain; Institute of Biomedical Research of Salamanca, University Hospital of Salamanca, University of Salamanca, CSIC, 37007 Salamanca, Spain; Department of Biochemistry and Molecular Biology, University of Salamanca, 37007 Salamanca, Spain; CIBERFES, Institute of Health Carlos III, 28029 Madrid, Spain
| | - Maria Eugenia Soriano
- Department of Biology, University of Padova, Via U. Bassi 58/B, Padova 35121, Italy.
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173
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Fung TS, Ji WK, Higgs HN, Chakrabarti R. Two distinct actin filament populations have effects on mitochondria, with differences in stimuli and assembly factors. J Cell Sci 2019; 132:jcs234435. [PMID: 31413070 PMCID: PMC6765187 DOI: 10.1242/jcs.234435] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 08/07/2019] [Indexed: 12/12/2022] Open
Abstract
Recent studies show that mitochondria and actin filaments work together in two contexts: (1) increased cytoplasmic calcium induces cytoplasmic actin polymerization that stimulates mitochondrial fission and (2) mitochondrial depolarization causes actin assembly around mitochondria, with roles in mitophagy. It is unclear whether these two processes utilize similar actin assembly mechanisms. Here, we show that these are distinct actin assembly mechanisms in the acute phase after treatment (<10 min). Calcium-induced actin assembly is INF2 dependent and Arp2/3 complex independent, whereas depolarization-induced actin assembly is Arp2/3 complex dependent and INF2 independent. The two types of actin polymerization are morphologically distinct, with calcium-induced filaments throughout the cytosol and depolarization-induced filaments as 'clouds' around depolarized mitochondria. We have previously shown that calcium-induced actin stimulates increases in both mitochondrial calcium and recruitment of the dynamin GTPase Drp1 (also known as DNM1L). In contrast, depolarization-induced actin is temporally associated with extensive mitochondrial dynamics that do not result in mitochondrial fission, but in circularization of the inner mitochondrial membrane (IMM). These dynamics are dependent on the protease OMA1 and independent of Drp1. Actin cloud inhibition causes increased IMM circularization, suggesting that actin clouds limit these dynamics.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Tak Shun Fung
- Department of Biochemistry and Cell Biology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Wei-Ke Ji
- Department of Biochemistry and Molecular Biology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China
| | - Henry N Higgs
- Department of Biochemistry and Cell Biology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Rajarshi Chakrabarti
- Department of Biochemistry and Cell Biology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
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174
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Paggio A, Checchetto V, Campo A, Menabò R, Di Marco G, Di Lisa F, Szabo I, Rizzuto R, De Stefani D. Identification of an ATP-sensitive potassium channel in mitochondria. Nature 2019; 572:609-613. [PMID: 31435016 PMCID: PMC6726485 DOI: 10.1038/s41586-019-1498-3] [Citation(s) in RCA: 169] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 07/25/2019] [Indexed: 11/09/2022]
Abstract
Mitochondria provide chemical energy for endoergonic reactions in the form of ATP, and their activity must meet cellular energy requirements, but the mechanisms that link organelle performance to ATP levels are poorly understood. Here we confirm the existence of a protein complex localized in mitochondria that mediates ATP-dependent potassium currents (that is, mitoKATP). We show that-similar to their plasma membrane counterparts-mitoKATP channels are composed of pore-forming and ATP-binding subunits, which we term MITOK and MITOSUR, respectively. In vitro reconstitution of MITOK together with MITOSUR recapitulates the main properties of mitoKATP. Overexpression of MITOK triggers marked organelle swelling, whereas the genetic ablation of this subunit causes instability in the mitochondrial membrane potential, widening of the intracristal space and decreased oxidative phosphorylation. In a mouse model, the loss of MITOK suppresses the cardioprotection that is elicited by pharmacological preconditioning induced by diazoxide. Our results indicate that mitoKATP channels respond to the cellular energetic status by regulating organelle volume and function, and thereby have a key role in mitochondrial physiology and potential effects on several pathological processes.
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Affiliation(s)
- Angela Paggio
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | | | - Antonio Campo
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | | | - Giulia Di Marco
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Fabio Di Lisa
- Department of Biomedical Sciences, University of Padova, Padova, Italy.,CNR Institute of Neuroscience, Padova, Italy
| | - Ildiko Szabo
- Department of Biology, University of Padova, Padova, Italy.,CNR Institute of Neuroscience, Padova, Italy
| | - Rosario Rizzuto
- Department of Biomedical Sciences, University of Padova, Padova, Italy.
| | - Diego De Stefani
- Department of Biomedical Sciences, University of Padova, Padova, Italy.
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175
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Kimura T, Kimura AK, Ren M, Monteiro V, Xu Y, Berno B, Schlame M, Epand RM. Plasmalogen loss caused by remodeling deficiency in mitochondria. Life Sci Alliance 2019; 2:e201900348. [PMID: 31434794 PMCID: PMC6707388 DOI: 10.26508/lsa.201900348] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 07/30/2019] [Accepted: 08/01/2019] [Indexed: 12/16/2022] Open
Abstract
Lipid homeostasis is crucial in human health. Barth syndrome (BTHS), a life-threatening disease typically diagnosed with cardiomyopathy and neutropenia, is caused by mutations in the mitochondrial transacylase tafazzin. By high-resolution 31P nuclear magnetic resonance (NMR) with cryoprobe technology, recently we found a dramatic loss of choline plasmalogen in the tafazzin-knockdown (TAZ-KD) mouse heart, besides observing characteristic cardiolipin (CL) alterations in BTHS. In inner mitochondrial membrane where tafazzin locates, CL and diacyl phosphatidylethanolamine are known to be essential via lipid-protein interactions reflecting their cone shape for integrity of respiratory chain supercomplexes and cristae ultrastructure. Here, we investigate the TAZ-KD brain, liver, kidney, and lymphoblast from patients compared with controls. We identified common yet markedly cell type-dependent losses of ethanolamine plasmalogen as the dominant plasmalogen class therein. Tafazzin function thus critically relates to homeostasis of plasmalogen, which in the ethanolamine class has conceivably analogous and more potent molecular functions in mitochondria than diacyl phosphatidylethanolamine. The present discussion of a loss of plasmalogen-protein interaction applies to other diseases with mitochondrial plasmalogen loss and aberrant forms of this organelle, including Alzheimer's disease.
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Affiliation(s)
- Tomohiro Kimura
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada
| | - Atsuko K Kimura
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada
| | - Mindong Ren
- Department of Cell Biology, New York University Langone Medical Center, New York, NY, USA
- Department of Anesthesiology, New York University Langone Medical Center, New York, NY, USA
| | - Vernon Monteiro
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada
| | - Yang Xu
- Department of Anesthesiology, New York University Langone Medical Center, New York, NY, USA
| | - Bob Berno
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Canada
| | - Michael Schlame
- Department of Cell Biology, New York University Langone Medical Center, New York, NY, USA
- Department of Anesthesiology, New York University Langone Medical Center, New York, NY, USA
| | - Richard M Epand
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada
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176
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Mitochondrial cristae narrowing upon higher 2-oxoglutarate load. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2019; 1860:659-678. [DOI: 10.1016/j.bbabio.2019.06.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 06/19/2019] [Accepted: 06/21/2019] [Indexed: 12/20/2022]
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177
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A photostable fluorescent marker for the superresolution live imaging of the dynamic structure of the mitochondrial cristae. Proc Natl Acad Sci U S A 2019; 116:15817-15822. [PMID: 31337683 DOI: 10.1073/pnas.1905924116] [Citation(s) in RCA: 112] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Stimulation emission depletion (STED) microscopy enables ultrastructural imaging of organelle dynamics with a high spatiotemporal resolution in living cells. For the visualization of the mitochondrial membrane dynamics in STED microscopy, rationally designed mitochondrial fluorescent markers with enhanced photostability are required. Herein, we report the development of a superphotostable fluorescent labeling reagent with long fluorescence lifetime, whose design is based on a structurally reinforced naphthophosphole fluorophore that is conjugated with an electron-donating diphenylamino group. The combination of long-lived fluorescence and superphotostable features of the fluorophore allowed us to selectively capture the ultrastructures of the mitochondrial cristae with a resolution of ∼60 nm when depleted at 660 nm. This chemical tool provides morphological information of the cristae, which has so far only been observed in fixed cells using electron microscopy. Moreover, this method gives information about the dynamic ultrastructures such as the intermembrane fusion in different mitochondria as well as the intercristae mergence in a single mitochondrion during the apoptosis-like mitochondrial swelling process.
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178
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Li D, Wang J, Jin Z, Zhang Z. Structural and evolutionary characteristics of dynamin-related GTPase OPA1. PeerJ 2019; 7:e7285. [PMID: 31328044 PMCID: PMC6622160 DOI: 10.7717/peerj.7285] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 06/12/2019] [Indexed: 12/29/2022] Open
Abstract
OPA1 is a dynamin-related GTPase that controls mitochondrial fusion, cristae remodeling, energetics and mtDNA maintenance. However, the molecular architecture of OPA1 is poorly understood. Here we modeled the structure of human OPA1 by the threading approach. We found that the C-terminal region of the OPA1 protein had multiple functional domains, while the N-terminal region was rich in alpha helices and did not include specific domains. For the short soluble forms of OPA1, we observed that there were obvious hydrophobic regions near the two cleavage sites and the N-terminal was positively charged after cleavage. The blue native analysis revealed that the protein could form stable homodimers. In addition, the evolutionary conservation of the C-terminal region, where most of the known mutated disease-related sites were located, was significantly higher than that of the N-terminal region. These findings provided new insights into the structure and biochemical function of OPA1.
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Affiliation(s)
- Dandan Li
- College of Biological Sciences, China Agricultural University, Beijing, China
- National Institute of Biological Sciences, Beijing, China
| | - Jinlan Wang
- Physical Examination Office of Shandong Province, Health Commission of Shandong Province, Jinan, China
| | - Zichen Jin
- Department of Chemistry, University of Minnesota, Minnesota, MN, USA
| | - Zheng Zhang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, China
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179
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Tang X, Wang C, Hsieh Y, Wang C, Wang J, Han Z, Cong N, Ma R, Chi F. Triptolide induces toxicity in inner ear stem cells via promoting DNA damage. Toxicol In Vitro 2019; 61:104597. [PMID: 31288072 DOI: 10.1016/j.tiv.2019.104597] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 06/16/2019] [Accepted: 07/05/2019] [Indexed: 11/16/2022]
Abstract
Emerging evidence and clinical case reports have observed a risk of cytotoxic effects of triptolide in patients. We aimed to investigate the triptolide-induced toxicity in mouse inner ear stem cells. The utricular sensory epithelium from adult BALB/C6 mice was used for the isolation of inner ear stem cells. Sphere formation assay was applied to examine the stemness of the cells. Cell count kit-8 and Bromodeoxyuridine assays were employed to detect the cell proliferation ability. Cell apoptosis was measured with Annexin V-FITC & propidium iodide Apoptosis kit. The relative expression levels of gamma H2A histone family member X (γH2AX), tumor suppressor p53-binding protein 1 (53BP1) and optic atrophy 1 (OPA-1) were measured by Western Blot. Mitochondrial function was analyzed by the MitoGreen green-fluorescent mitochondrial dye kit. Triptolide significantly inhibited the cell viability and proliferation and suppressed the capability of sphere formation. Furthermore, triptolide induced apoptosis as indicated by increased expression of DNA damage repair markers γH2AX and 53BP1. Moreover, triptolide influenced the function of mitochondria by inducing the cleavage of OPA-1. Our work clarifies the toxicity of triptolide in mouse inner ear stem cells, which provides clues of the toxicology mechanism for future studies and basis for clinical use.
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Affiliation(s)
- Xuxia Tang
- Department of Otolaryngology, the First Affiliated Hospital of Zhejiang Traditional Chinese Medical University, Hangzhou 310006, Zhejiang, China
| | - Congpin Wang
- Department of Otology and Skull Base Surgery, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China; Shanghai Auditory Medical Center, Shanghai 200000, China; NHC Key laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China; Fudan University, Shanghai 200031, China
| | - Yuelin Hsieh
- Department of Otology and Skull Base Surgery, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China; Shanghai Auditory Medical Center, Shanghai 200000, China; NHC Key laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China; Fudan University, Shanghai 200031, China
| | - Chengjin Wang
- Department of Otology and Skull Base Surgery, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China; Shanghai Auditory Medical Center, Shanghai 200000, China; NHC Key laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China; Fudan University, Shanghai 200031, China
| | - Jinyu Wang
- Department of Otology and Skull Base Surgery, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China; Shanghai Auditory Medical Center, Shanghai 200000, China; NHC Key laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China; Fudan University, Shanghai 200031, China
| | - Zhao Han
- Department of Otology and Skull Base Surgery, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China; Shanghai Auditory Medical Center, Shanghai 200000, China; NHC Key laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China; Fudan University, Shanghai 200031, China.
| | - Ning Cong
- Department of Otology and Skull Base Surgery, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China; Shanghai Auditory Medical Center, Shanghai 200000, China; NHC Key laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China; Fudan University, Shanghai 200031, China.
| | - Rui Ma
- Department of Otology and Skull Base Surgery, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China; Shanghai Auditory Medical Center, Shanghai 200000, China; NHC Key laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China; Fudan University, Shanghai 200031, China
| | - Fanglu Chi
- Department of Otology and Skull Base Surgery, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China; Shanghai Auditory Medical Center, Shanghai 200000, China; NHC Key laboratory of Hearing Medicine, Fudan University, Shanghai 200031, China; Fudan University, Shanghai 200031, China
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180
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Mitochondrial Homeostasis and Cellular Senescence. Cells 2019; 8:cells8070686. [PMID: 31284597 PMCID: PMC6678662 DOI: 10.3390/cells8070686] [Citation(s) in RCA: 119] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Revised: 07/02/2019] [Accepted: 07/05/2019] [Indexed: 01/07/2023] Open
Abstract
Cellular senescence refers to a stress response aiming to preserve cellular and, therefore, organismal homeostasis. Importantly, deregulation of mitochondrial homeostatic mechanisms, manifested as impaired mitochondrial biogenesis, metabolism and dynamics, has emerged as a hallmark of cellular senescence. On the other hand, impaired mitostasis has been suggested to induce cellular senescence. This review aims to provide an overview of homeostatic mechanisms operating within mitochondria and a comprehensive insight into the interplay between cellular senescence and mitochondrial dysfunction.
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181
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Mitochondria as playmakers of apoptosis, autophagy and senescence. Semin Cell Dev Biol 2019; 98:139-153. [PMID: 31154010 DOI: 10.1016/j.semcdb.2019.05.022] [Citation(s) in RCA: 261] [Impact Index Per Article: 52.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 05/21/2019] [Accepted: 05/22/2019] [Indexed: 12/16/2022]
Abstract
Mitochondria are the key energy-producing organelles and cellular source of reactive species. They are responsible for managing cell life and death by a balanced homeostasis passing through a network of structures, regulated principally via fission and fusion. Herein we discuss about the most advanced findings considering mitochondria as dynamic biophysical systems playing compelling roles in the regulation of energy metabolism in both physiologic and pathologic processes controlling cell death and survival. Precisely, we focus on the mitochondrial commitment to the onset, maintenance and counteraction of apoptosis, autophagy and senescence in the bioenergetic reprogramming of cancer cells. In this context, looking for a pharmacological manipulation of cell death processes as a successful route for future targeted therapies, there is major biotechnological challenge in underlining the location, function and molecular mechanism of mitochondrial proteins. Based on the critical role of mitochondrial functions for cellular health, a better knowledge of the main molecular players in mitochondria disfunction could be decisive for the therapeutical control of degenerative diseases, including cancer.
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182
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Abstract
Significance: In addition to their classical role in cellular ATP production, mitochondria are of key relevance in various (patho)physiological mechanisms including second messenger signaling, neuro-transduction, immune responses and death induction. Recent Advances: Within cells, mitochondria are motile and display temporal changes in internal and external structure ("mitochondrial dynamics"). During the last decade, substantial empirical and in silico evidence was presented demonstrating that mitochondrial dynamics impacts on mitochondrial function and vice versa. Critical Issues: However, a comprehensive and quantitative understanding of the bidirectional links between mitochondrial external shape, internal structure and function ("morphofunction") is still lacking. The latter particularly hampers our understanding of the functional properties and behavior of individual mitochondrial within single living cells. Future Directions: In this review we discuss the concept of mitochondrial morphofunction in mammalian cells, primarily using experimental evidence obtained within the last decade. The topic is introduced by briefly presenting the central role of mitochondria in cell physiology and the importance of the mitochondrial electron transport chain (ETC) therein. Next, we summarize in detail how mitochondrial (ultra)structure is controlled and discuss empirical evidence regarding the equivalence of mitochondrial (ultra)structure and function. Finally, we provide a brief summary of how mitochondrial morphofunction can be quantified at the level of single cells and mitochondria, how mitochondrial ultrastructure/volume impacts on mitochondrial bioreactions and intramitochondrial protein diffusion, and how mitochondrial morphofunction can be targeted by small molecules.
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Affiliation(s)
- Elianne P. Bulthuis
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Merel J.W. Adjobo-Hermans
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Peter H.G.M. Willems
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Werner J.H. Koopman
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
- Address correspondence to: Dr. Werner J.H. Koopman, Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, P.O. Box 9101, Nijmegen NL-6500 HB, The Netherlands
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183
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Baker N, Patel J, Khacho M. Linking mitochondrial dynamics, cristae remodeling and supercomplex formation: How mitochondrial structure can regulate bioenergetics. Mitochondrion 2019; 49:259-268. [PMID: 31207408 DOI: 10.1016/j.mito.2019.06.003] [Citation(s) in RCA: 91] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 05/18/2019] [Accepted: 06/06/2019] [Indexed: 01/21/2023]
Abstract
The dynamic and fluid nature of mitochondria allows for modifications in mitochondrial shape, connectivity and cristae architecture. The precise balance of mitochondrial dynamics is among the most critical features in the control of mitochondrial function. In the past few years, mitochondrial shape has emerged as a key regulatory factor in the determination of the bioenergetic capacity of cells. This is mostly due to the recent discoveries linking changes in cristae organization with supercomplex assembly of the electron transport chain (ETC), also defined as the formation of respirosomes. Here we will review the most current advances demonstrating the impact of mitochondrial dynamics and cristae shape on oxidative metabolism, respiratory efficiency, and redox state. Furthermore, we will discuss the implications of mitochondrial dynamics and supercomplex assembly under physiological and pathological conditions.
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Affiliation(s)
- Nicole Baker
- Department of Biochemistry, Microbiology and Immunology, Ottawa Institute of Systems Biology (OISB), Center for Neuromuscular Disease, University of Ottawa, Ottawa, Ontario, Canada
| | - Jeel Patel
- Department of Biochemistry, Microbiology and Immunology, Ottawa Institute of Systems Biology (OISB), Center for Neuromuscular Disease, University of Ottawa, Ottawa, Ontario, Canada
| | - Mireille Khacho
- Department of Biochemistry, Microbiology and Immunology, Ottawa Institute of Systems Biology (OISB), Center for Neuromuscular Disease, University of Ottawa, Ottawa, Ontario, Canada.
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184
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Xu YJ, Mei Y, Shi XQ, Zhang YF, Wang XY, Guan L, Wang Q, Pan HF. Albiflorin ameliorates memory deficits in APP/PS1 transgenic mice via ameliorating mitochondrial dysfunction. Brain Res 2019; 1719:113-123. [PMID: 31150651 DOI: 10.1016/j.brainres.2019.05.037] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 05/18/2019] [Accepted: 05/28/2019] [Indexed: 02/02/2023]
Abstract
Albiflorin, the main component of Radix Paeoniae Alba, has been shown to ameliorate injury in cell models of Alzheimer's disease induced by amyloid-β (Aβ), but the mechanism is unclear. We used 7-month-old APP/PS1 mice to determine whether albiflorin is capable of protecting against Alzheimer's disease. We found that four weeks of intragastric administration of albiflorin (20 mg/kg/d and 40 mg/kg/d) ameliorated memory deficits in APP/PS1 mice. Albiflorin conferred synaptic protection by decreasing Aβ levels and increasing PSD-95, synaptophysin and synapsin 1 levels in the brains of APP/PS1 mice. Albiflorin played an antioxidative role by reducing reactive oxygen species (ROS) levels and elevating Mn-SOD activity in the brain. Albiflorin also reduced the level of Drp1, increased the levels of Mfn1, Mfn2 and Opa1 and improved mitochondrial morphology in APP/PS1 mice. Albiflorin inhibited the mitochondrial pathway of apoptosis by increasing the levels of Bcl-2 and Bcl-xl and decreasing the levels of Bax, caspase-3 and cytochrome c in both the hippocampus and the cortex and by reducing the number of apoptotic cells in the anterior parietal cortex of the APP/PS1 mice. In conclusion, treatment with albiflorin improved mitochondrial function, reduced Aβ deposition in the brain and ameliorated memory deficits in APP/PS1 mice. These findings indicate that albiflorin may serve as a potential antidementia drug.
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Affiliation(s)
- Yi-Jun Xu
- Institute of Clinical Pharmacology, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yu Mei
- Institute of Clinical Pharmacology, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xue-Qing Shi
- Institute of Clinical Pharmacology, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yi-Fang Zhang
- Institute of Clinical Pharmacology, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xin-Yue Wang
- Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Li Guan
- Institute of Clinical Pharmacology, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Qi Wang
- Institute of Clinical Pharmacology, Guangzhou University of Chinese Medicine, Guangzhou, China.
| | - Hua-Feng Pan
- Institute of Clinical Pharmacology, Guangzhou University of Chinese Medicine, Guangzhou, China.
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185
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Yoon W, Hwang SH, Lee SH, Chung J. Drosophila ADCK1 is critical for maintaining mitochondrial structures and functions in the muscle. PLoS Genet 2019; 15:e1008184. [PMID: 31125351 PMCID: PMC6553794 DOI: 10.1371/journal.pgen.1008184] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 06/06/2019] [Accepted: 05/08/2019] [Indexed: 11/18/2022] Open
Abstract
The function of AarF domain-containing kinase 1 (ADCK1) has not been thoroughly revealed. Here we identified that ADCK1 utilizes YME1-like 1 ATPase (YME1L1) to control optic atrophy 1 (OPA1) and inner membrane mitochondrial protein (IMMT) in regulating mitochondrial dynamics and cristae structure. We firstly observed that a serious developmental impairment occurred in Drosophila ADCK1 (dADCK1) deletion mutant, resulting in premature death before adulthood. By using temperature sensitive ubiquitously expression driver tub-Gal80ts/tub-Gal4 or muscle-specific expression driver mhc-Gal4, we observed severely defective locomotive activities and structural abnormality in the muscle along with increased mitochondrial fusion in the dADCK1 knockdown flies. Moreover, decreased mitochondrial membrane potential, ATP production and survival rate along with increased ROS and apoptosis in the flies further demonstrated that the structural abnormalities of mitochondria induced by dADCK1 knockdown led to their functional abnormalities. Consistent with the ADCK1 loss-of-function data in Drosophila, ADCK1 over-expression induced mitochondrial fission and clustering in addition to destruction of the cristae structure in Drosophila and mammalian cells. Interestingly, knockdown of YME1L1 rescued the phenotypes of ADCK1 over-expression. Furthermore, genetic epistasis from fly genetics and mammalian cell biology experiments led us to discover the interactions among IMMT, OPA1 and ADCK1. Collectively, these results established a mitochondrial signaling pathway composed of ADCK1, YME1L1, OPA1 and IMMT, which has essential roles in maintaining mitochondrial morphologies and functions in the muscle. Mitochondria function as energy producing factories in the cell, and thus the malfunctioning of mitochondria becomes the causes of many diseases. Especially in muscles that continuously require a vast amount of energy, dysfunction of mitochondria leads to abnormalities in muscles. Mitochondria maintain their homeostasis and recover from stresses induced by external stimuli through a dynamic process of continuous fusion and fission. Moreover, they constantly produce ATP through their wrinkled internal structure, called the cristae. We discovered that ADCK1 is important in maintaining these mitochondrial functions. In the fruit fly model, a severe developmental anomaly was observed in ADCK1 mutant, and inhibition of ADCK1 expression led to defects in locomotive activity, along with abnormalities in mitochondrial structure and functions in muscles. Interestingly, these anomalies in mitochondria were due to OPA1 and IMMT proteins that exist downstream of ADCK1, regulated by ADCK1 through a protease called YME1L1. These results provide better molecular understanding on how mitochondria contribute to degenerative diseases in the muscular system.
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Affiliation(s)
- Woongchang Yoon
- National Creative Research Initiatives Center for Energy Homeostasis Regulation, Institute of Molecular Biology and Genetics, Seoul National University, Gwanak-Gu, Seoul, Republic of Korea
- School of Biological Sciences, Seoul National University, Gwanak-Gu, Seoul, Republic of Korea
| | - Sun-Hong Hwang
- National Creative Research Initiatives Center for Energy Homeostasis Regulation, Institute of Molecular Biology and Genetics, Seoul National University, Gwanak-Gu, Seoul, Republic of Korea
- School of Biological Sciences, Seoul National University, Gwanak-Gu, Seoul, Republic of Korea
| | - Sang-Hee Lee
- Institute of Molecular Biology and Genetics, Seoul National University, Gwanak-Gu, Seoul, Republic of Korea
| | - Jongkyeong Chung
- National Creative Research Initiatives Center for Energy Homeostasis Regulation, Institute of Molecular Biology and Genetics, Seoul National University, Gwanak-Gu, Seoul, Republic of Korea
- School of Biological Sciences, Seoul National University, Gwanak-Gu, Seoul, Republic of Korea
- * E-mail:
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186
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Patten DA, Ouellet M, Allan DS, Germain M, Baird SD, Harper ME, Richardson RB. Mitochondrial adaptation in human mesenchymal stem cells following ionizing radiation. FASEB J 2019; 33:9263-9278. [PMID: 31112400 PMCID: PMC6662961 DOI: 10.1096/fj.201801483rr] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Mitochondria are highly dynamic organelles that respond rapidly to a number of stressors to regulate energy transduction, cell death signaling, and reactive oxygen species generation. We hypothesized that mitochondrial remodeling, comprising both structural and functional alterations, following ionizing radiation (IR) may underlie some of the tenets of radiobiology. Mesenchymal stem cells (MSCs) are precursors of bone marrow stroma and are altered in acute myeloid leukemia and by radiation and chemotherapy. Here, we report on changes in mitochondrial remodeling in human MSCs following X-ray IR. Mitochondrial function was significantly increased in MSCs 4 h after IR as measured by mitochondrial oxygen consumption. Consistent with this elevated functional effect, electron transport chain supercomplexes were also increased in irradiated samples. In addition, mitochondria were significantly, albeit modestly, elongated, as measured by high-throughput automated confocal imaging coupled with automated mitochondrial morphometric analyses. We also demonstrate in fibroblasts that mitochondrial remodeling is required for the adaptation of cells to IR. To determine novel mechanisms involved in mitochondrial remodeling, we performed quantitative proteomics on isolated mitochondria from cells following IR. Label-free quantitative mitochondrial proteomics revealed notable changes in proteins in irradiated samples and identified prosaposin, and potentially its daughter protein saposin-B, as a potential candidate for regulating mitochondrial function following IR. Whereas research into the biologic effects of cellular irradiation has long focused on nuclear DNA effects, our experimental work, along with that of others, is finding that mitochondrial effects may have broader implications in the field of stress adaptation and cell death in cancer (including leukemia) and other disease states.-Patten, D. A., Ouellet, M., Allan, D. S., Germain, M., Baird, S. D., Harper, M.-E., Richardson, R. B. Mitochondrial adaptation in human mesenchymal stem cells following ionizing radiation.
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Affiliation(s)
- David A Patten
- Radiobiology and Health Branch, Chalk River Laboratories, Canadian Nuclear Laboratories (CNL), Chalk River, Ontario, Canada.,Faculty of Medicine, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Ontario, Canada.,Ottawa Institute of Systems Biology, Ottawa, Ontario, Canada
| | - Mathieu Ouellet
- Département de Biologie Médicale, Université du Québec à Trois-Rivières, Trois-Rivières, Quebec, Canada
| | - David S Allan
- Faculty of Medicine, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Ontario, Canada
| | - Marc Germain
- Département de Biologie Médicale, Université du Québec à Trois-Rivières, Trois-Rivières, Quebec, Canada
| | - Stephen D Baird
- Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada
| | - Mary-Ellen Harper
- Faculty of Medicine, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Ontario, Canada.,Ottawa Institute of Systems Biology, Ottawa, Ontario, Canada
| | - Richard B Richardson
- Radiobiology and Health Branch, Chalk River Laboratories, Canadian Nuclear Laboratories (CNL), Chalk River, Ontario, Canada.,McGill Medical Physics Unit, Glen Site, Cedars Cancer Centre, Montreal, Quebec, Canada
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187
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Sam50-Mic19-Mic60 axis determines mitochondrial cristae architecture by mediating mitochondrial outer and inner membrane contact. Cell Death Differ 2019; 27:146-160. [PMID: 31097788 DOI: 10.1038/s41418-019-0345-2] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 04/15/2019] [Accepted: 04/18/2019] [Indexed: 11/08/2022] Open
Abstract
Mitochondrial cristae are critical for efficient oxidative phosphorylation, however, how cristae architecture is precisely organized remains largely unknown. Here, we discovered that Mic19, a core component of MICOS (mitochondrial contact site and cristae organizing system) complex, can be cleaved at N-terminal by mitochondrial protease OMA1 under certain physiological stresses. Mic19 directly interacts with mitochondrial outer-membrane protein Sam50 (the key subunit of SAM complex) and inner-membrane protein Mic60 (the key component of MICOS complex) to form Sam50-Mic19-Mic60 axis, which dominantly connects SAM and MICOS complexes to assemble MIB (mitochondrial intermembrane space bridging) supercomplex for mediating mitochondrial outer- and inner-membrane contact. OMA1-mediated Mic19 cleavage causes Sam50-Mic19-Mic60 axis disruption, which separates SAM and MICOS and leads to MIB disassembly. Disrupted Sam50-Mic19-Mic60 axis, even in the presence of SAM and MICOS complexes, causes the abnormal mitochondrial morphology, loss of mitochondrial cristae junctions, abnormal cristae distribution and reduced ATP production. Importantly, Sam50 displays punctate distribution at mitochondrial outer membrane, and acts as an anchoring point to guide the formation of mitochondrial cristae junctions. Therefore, we propose that Sam50-Mic19-Mic60 axis-mediated SAM-MICOS complexes integration determines mitochondrial cristae architecture.
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188
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Yang F, Li B, Yang Y, Huang M, Liu X, Zhang Y, Liu H, Zhang L, Pan Y, Tian S, Wu Y, Wang L, Yang L. Leptin enhances glycolysis via OPA1-mediated mitochondrial fusion to promote mesenchymal stem cell survival. Int J Mol Med 2019; 44:301-312. [PMID: 31115489 DOI: 10.3892/ijmm.2019.4189] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 04/24/2019] [Indexed: 11/06/2022] Open
Abstract
Transplantation of mesenchymal stem cells (MSCs) is emerging as a potential therapy for cardiovascular diseases. However, the poor survival of transplanted MSCs is a major obstacle to improving their clinical efficacy. Accumulating evidence indicates that hypoxic preconditioning (HPC) can improve the survival of MSCs. It has been previously reported that leptin plays a critical role in HPC‑enhanced MSC survival through increasing optic atrophy 1 (OPA1)‑dependent mitochondrial fusion. Survival of MSCs mainly relies on glycolysis as an energy source. The close relationship between leptin and glucose homeostasis has attracted intense scientific interest. Furthermore, emerging evidence indicates that mitochondrial dynamics (fusion and fission) are associated with alterations in glycolysis. The aim of the present study was to investigate whether leptin increases MSC survival through metabolic regulation. Leptin‑modulated increased OPA1 expression was found to be associated with increased glycolysis. However, the glycolytic efficacy of leptin was abrogated after silencing OPA1 using a selective siRNA, suggesting that OPA1 directly regulates glycolysis. Furthermore, the activation of sodium‑glucose symporter 1 (SGLT1) was markedly induced by leptin. However, leptin‑induced glycolysis was primarily blocked by SGLT1 inhibitor treatment. Thus, leptin regulates OPA1‑dependent glycolysis to improve MSC survival primarily through SGLT1 activation. We therefore identified a pivotal leptin/OPA1/SGLT1 signaling pathway for mitochondrial dynamic‑mediated glycolysis, which may optimize the therapeutic efficiency of MSCs.
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Affiliation(s)
- Fan Yang
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Bing Li
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Yongyao Yang
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Minhua Huang
- Xixiu District People's Hospital, Anshun, Guizhou 561000, P.R. China
| | - Xinghui Liu
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Yang Zhang
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Hui Liu
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Lan Zhang
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Yujia Pan
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Shui Tian
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Yueting Wu
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Lijuan Wang
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
| | - Long Yang
- Department of Cardiology, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
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189
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The Metabolomic Signature of Opa1 Deficiency in Rat Primary Cortical Neurons Shows Aspartate/Glutamate Depletion and Phospholipids Remodeling. Sci Rep 2019; 9:6107. [PMID: 30988455 PMCID: PMC6465244 DOI: 10.1038/s41598-019-42554-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 03/26/2019] [Indexed: 12/25/2022] Open
Abstract
Pathogenic variants of OPA1, which encodes a dynamin GTPase involved in mitochondrial fusion, are responsible for a spectrum of neurological disorders sharing optic nerve atrophy and visual impairment. To gain insight on OPA1 neuronal specificity, we performed targeted metabolomics on rat cortical neurons with OPA1 expression inhibited by RNA interference. Of the 103 metabolites accurately measured, univariate analysis including the Benjamini-Hochberg correction revealed 6 significantly different metabolites in OPA1 down-regulated neurons, with aspartate being the most significant (p < 0.001). Supervised multivariate analysis by OPLS-DA yielded a model with good predictive capability (Q2cum = 0.65) and a low risk of over-fitting (permQ2 = -0.16, CV-ANOVA p-value 0.036). Amongst the 46 metabolites contributing the most to the metabolic signature were aspartate, glutamate and threonine, which all decreased in OPA1 down-regulated neurons, and lysine, 4 sphingomyelins, 4 lysophosphatidylcholines and 32 phosphatidylcholines which were increased. The phospholipid signature may reflect intracellular membrane remodeling due to loss of mitochondrial fusion and/or lipid droplet accumulation. Aspartate and glutamate deficiency, also found in the plasma of OPA1 patients, is likely the consequence of respiratory chain deficiency, whereas the glutamate decrease could contribute to the synaptic dysfunction that we previously identified in this model.
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190
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Casuso RA, Al-Fazazi S, Hidalgo-Gutierrez A, López LC, Plaza-Díaz J, Rueda-Robles A, Huertas JR. Hydroxytyrosol influences exercise-induced mitochondrial respiratory complex assembly into supercomplexes in rats. Free Radic Biol Med 2019; 134:304-310. [PMID: 30685403 DOI: 10.1016/j.freeradbiomed.2019.01.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 01/02/2019] [Accepted: 01/21/2019] [Indexed: 10/27/2022]
Abstract
Hydroxytyrosol (HT) has been demonstrated to improve mitochondrial function, both in sedentary and in exercised animals. Herein, we assessed the effects of two different doses of HT on exercise-induced mitochondrial respiratory complex (C) assembly into supercomplexes (SCs) and the relation of the potential results to OPA1 levels and oxidative stress. Wistar rats were allocated into six groups: sedentary (SED), sedentary consuming 20 mg/kg/d of HT (SED-20), sedentary consuming 300 mg/kg/d of HT (SED-300); exercised (EXE), exercised consuming 20 mg/kg/d of HT (EXE-20) and exercised consuming 300 mg/kg/d of HT (EXE-300). Animals were exercised and/or supplemented for 10 weeks, and assembly of SCs, mitochondrial oxidative status and expression of OPA1 were quantified in the gastrocnemius muscle. Both EXE and EXE-20 animals exhibited increased assembly of CI into SCs, but this effect was absent in EXE-300 animals. Levels of CIII2 assembled into SCs were only increased in EXE-20 animals. Notably EXE-300 animals showed a decreased relative expression of s-OPA1 isoforms. Therefore, HT exerted dose-dependent effects on SC assembly in exercised animals. Although the mechanisms leading to SCs assembly in response to exercise and HT are unclear, it seems that a high HT dose can prevent SCs assembly during exercise by decreasing the expression of the s-OPA1 isoforms.
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Affiliation(s)
- Rafael A Casuso
- Institute of Nutrition and Food Technology, Biomedical Research Centre, Department of Physiology, Faculty of Sport Sciences, University of Granada, Avda del conocimiento s/n. 18016 Armilla, Granada, Spain
| | - Saad Al-Fazazi
- Institute of Nutrition and Food Technology, Biomedical Research Centre, Department of Physiology, Faculty of Sport Sciences, University of Granada, Avda del conocimiento s/n. 18016 Armilla, Granada, Spain
| | - Agustín Hidalgo-Gutierrez
- Institute of Biotechnology, Biomedical Research Centre, Department of Physiology, Faculty of Medicine, University of Granada, Avda del conocimiento s/n. 18016 Armilla, Granada, Spain
| | - Luis Carlos López
- Institute of Biotechnology, Biomedical Research Centre, Department of Physiology, Faculty of Medicine, University of Granada, Avda del conocimiento s/n. 18016 Armilla, Granada, Spain; Centro de Investigación Biomédica en Red de Fragilidad y Envejecimiento Saludable (CIBERFES), Spain
| | - Julio Plaza-Díaz
- Institute of Nutrition and Food Technology, Biomedical Research Centre, Department of Physiology, Faculty of Sport Sciences, University of Granada, Avda del conocimiento s/n. 18016 Armilla, Granada, Spain; Department of Biochemistry and Molecular Biology II, School of Pharmacy, University of Granada, Spain
| | - Ascensión Rueda-Robles
- Institute of Nutrition and Food Technology, Biomedical Research Centre, Department of Physiology, Faculty of Sport Sciences, University of Granada, Avda del conocimiento s/n. 18016 Armilla, Granada, Spain
| | - Jesus R Huertas
- Institute of Nutrition and Food Technology, Biomedical Research Centre, Department of Physiology, Faculty of Sport Sciences, University of Granada, Avda del conocimiento s/n. 18016 Armilla, Granada, Spain.
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191
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Abstract
Cell-to-cell heterogeneity drives a range of (patho)physiologically important phenomena, such as cell fate and chemotherapeutic resistance. The role of metabolism, and particularly of mitochondria, is increasingly being recognized as an important explanatory factor in cell-to-cell heterogeneity. Most eukaryotic cells possess a population of mitochondria, in the sense that mitochondrial DNA (mtDNA) is held in multiple copies per cell, where the sequence of each molecule can vary. Hence, intra-cellular mitochondrial heterogeneity is possible, which can induce inter-cellular mitochondrial heterogeneity, and may drive aspects of cellular noise. In this review, we discuss sources of mitochondrial heterogeneity (variations between mitochondria in the same cell, and mitochondrial variations between supposedly identical cells) from both genetic and non-genetic perspectives, and mitochondrial genotype-phenotype links. We discuss the apparent homeostasis of mtDNA copy number, the observation of pervasive intra-cellular mtDNA mutation (which is termed "microheteroplasmy"), and developments in the understanding of inter-cellular mtDNA mutation ("macroheteroplasmy"). We point to the relationship between mitochondrial supercomplexes, cristal structure, pH, and cardiolipin as a potential amplifier of the mitochondrial genotype-phenotype link. We also discuss mitochondrial membrane potential and networks as sources of mitochondrial heterogeneity, and their influence upon the mitochondrial genome. Finally, we revisit the idea of mitochondrial complementation as a means of dampening mitochondrial genotype-phenotype links in light of recent experimental developments. The diverse sources of mitochondrial heterogeneity, as well as their increasingly recognized role in contributing to cellular heterogeneity, highlights the need for future single-cell mitochondrial measurements in the context of cellular noise studies.
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Affiliation(s)
- Juvid Aryaman
- Department of Mathematics, Imperial College London, London, United Kingdom
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge, United Kingdom
| | - Iain G. Johnston
- School of Biosciences, University of Birmingham, Birmingham, United Kingdom
- EPSRC Centre for the Mathematics of Precision Healthcare, Imperial College London, London, United Kingdom
| | - Nick S. Jones
- Department of Mathematics, Imperial College London, London, United Kingdom
- EPSRC Centre for the Mathematics of Precision Healthcare, Imperial College London, London, United Kingdom
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192
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McManus MJ, Picard M, Chen HW, De Haas HJ, Potluri P, Leipzig J, Towheed A, Angelin A, Sengupta P, Morrow RM, Kauffman BA, Vermulst M, Narula J, Wallace DC. Mitochondrial DNA Variation Dictates Expressivity and Progression of Nuclear DNA Mutations Causing Cardiomyopathy. Cell Metab 2019; 29:78-90.e5. [PMID: 30174309 PMCID: PMC6717513 DOI: 10.1016/j.cmet.2018.08.002] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2017] [Revised: 02/01/2018] [Accepted: 08/01/2018] [Indexed: 02/03/2023]
Abstract
Nuclear-encoded mutations causing metabolic and degenerative diseases have highly variable expressivity. Patients sharing the homozygous mutation (c.523delC) in the adenine nucleotide translocator 1 gene (SLC25A4, ANT1) develop cardiomyopathy that varies from slowly progressive to fulminant. This variability correlates with the mitochondrial DNA (mtDNA) lineage. To confirm that mtDNA variants can modulate the expressivity of nuclear DNA (nDNA)-encoded diseases, we combined in mice the nDNA Slc25a4-/- null mutation with a homoplasmic mtDNA ND6P25L or COIV421A variant. The ND6P25L variant significantly increased the severity of cardiomyopathy while the COIV421A variant was phenotypically neutral. The adverse Slc25a4-/- and ND6P25L combination was associated with impaired mitochondrial complex I activity, increased oxidative damage, decreased l-Opa1, altered mitochondrial morphology, sensitization of the mitochondrial permeability transition pore, augmented somatic mtDNA mutation levels, and shortened lifespan. The strikingly different phenotypic effects of these mild mtDNA variants demonstrate that mtDNA can be an important modulator of autosomal disease.
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Affiliation(s)
- Meagan J McManus
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA
| | - Martin Picard
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA; Departments of Psychiatry and Neurology, Columbia University Medical Center, New York, NY 10032, USA
| | - Hsiao-Wen Chen
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA
| | - Hans J De Haas
- Department of Medicine, Mount Sinai Hospital, New York, NY 10029, USA
| | - Prasanth Potluri
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA
| | - Jeremy Leipzig
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA
| | - Atif Towheed
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA
| | - Alessia Angelin
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA
| | - Partho Sengupta
- Department of Medicine, Mount Sinai Hospital, New York, NY 10029, USA
| | - Ryan M Morrow
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA
| | - Brett A Kauffman
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Marc Vermulst
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA
| | - Jagat Narula
- Department of Medicine, Mount Sinai Hospital, New York, NY 10029, USA
| | - Douglas C Wallace
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Colket Translational Research Building, Room 6060, 3501 Civic Center Boulevard, Philadelphia, PA 19104-4302, USA; Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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193
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Expression of OPA1 and Mic60 genes and their association with mitochondrial cristae morphology in Tibetan sheep. Cell Tissue Res 2019; 376:273-279. [DOI: 10.1007/s00441-018-2975-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 11/29/2018] [Indexed: 10/27/2022]
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194
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Zhao WP, Wang HW, Liu J, Zhang ZH, Zhu SQ, Zhou BH. Mitochondrial respiratory chain complex abnormal expressions and fusion disorder are involved in fluoride-induced mitochondrial dysfunction in ovarian granulosa cells. CHEMOSPHERE 2019; 215:619-625. [PMID: 30342406 DOI: 10.1016/j.chemosphere.2018.10.043] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 10/03/2018] [Accepted: 10/06/2018] [Indexed: 06/08/2023]
Abstract
Excessive fluoride intake has a strong female reproductive toxicity, which can result in follicular developmental dysplasia and decrease oocytes developmental potential. The underlying mechanisms of fluoride-induced mitochondrial dysfunction in ovarian granulosa cells remain largely unknown. In this study, the ultrastructure changes of mitochondria and DNA damage in ovarian granulosa cells were observed under transmission electron microscope and TUNEL staining. Then, the ATP content and ROS level in granulosa cells were measured. The expression of mitochondrial fusion proteins and mitochondrial respiratory chain complexes, including OPA1 and Mfn1, and NDUFV2, SDHA and CYC1, in the ovarian tissues were measured by immunohistochemistry, Western blot and Quantitative real-time PCR analyses. The expression of ATP5j and ATP5h in the ovarian tissues was also measured. Results show that fluoride treatment considerably damages mitochondrial ultrastructure and enhances the apoptosis of granulosa cells. The ATP content greatly decreased, whereas the ROS level increased after fluoride treatment. The expression level of Mfn1 in the ovarian tissue was up-regulated, whereas OPA1 expression had no significant change. The expression levels of NDUFV2, SDHA and CYC1 were considerably up-regulated, and the expression of ATP5j and ATP5h were down-regulated after fluoride treatment. In summary, the damage in the mitochondrial ultrastructure, ATP content decrease, ROS level increase and the abnormal expression of OPA1, Mfn1, NDUFV2, SDHA, CYC1, ATP5j and ATP5h in ovary tissue are closely associated with fluoride-induced mitochondrial dysfunction, which might be responsible for the follicular developmental dysplasia and the potential decrease in oocyte development induced by fluoride in female mice.
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Affiliation(s)
- Wen-Peng Zhao
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, PR China.
| | - Hong-Wei Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, PR China.
| | - Jing Liu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, PR China.
| | - Zi-Hao Zhang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, PR China.
| | - Shi-Quan Zhu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, PR China.
| | - Bian-Hua Zhou
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, PR China.
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195
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Sedlackova L, Korolchuk VI. Mitochondrial quality control as a key determinant of cell survival. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2018; 1866:575-587. [PMID: 30594496 DOI: 10.1016/j.bbamcr.2018.12.012] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 12/03/2018] [Accepted: 12/21/2018] [Indexed: 01/09/2023]
Abstract
Mitochondria are the energy producing dynamic double-membraned organelles essential for cellular and organismal survival. A multitude of intra- and extra-cellular signals involved in the regulation of energy metabolism and cell fate determination converge on mitochondria to promote or prevent cell survival by modulating mitochondrial function and structure. Mitochondrial fitness is maintained by mitophagy, a pathway of selective degradation of dysfunctional organelles. Mitophagy impairment and altered clearance results in increased levels of dysfunctional and structurally aberrant mitochondria, changes in energy production, loss of responsiveness to intra- and extra-cellular signals and ultimately cell death. The decline of mitochondrial function and homeostasis with age is reported to be central to age-related pathologies. Here we discuss the molecular mechanisms controlling mitochondrial dynamics, mitophagy and cell death signalling and how their perturbation may contribute to ageing and age-related illness.
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Affiliation(s)
- Lucia Sedlackova
- Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne NE4 5PL, UK
| | - Viktor I Korolchuk
- Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne NE4 5PL, UK.
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196
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Lee H, Yoon Y. Mitochondrial Membrane Dynamics-Functional Positioning of OPA1. Antioxidants (Basel) 2018; 7:antiox7120186. [PMID: 30544804 PMCID: PMC6316456 DOI: 10.3390/antiox7120186] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 12/04/2018] [Accepted: 12/06/2018] [Indexed: 12/21/2022] Open
Abstract
The maintenance of mitochondrial energetics requires the proper regulation of mitochondrial morphology, and vice versa. Mitochondrial dynamins control mitochondrial morphology by mediating fission and fusion. One of them, optic atrophy 1 (OPA1), is the mitochondrial inner membrane remodeling protein. OPA1 has a dual role in maintaining mitochondrial morphology and energetics through mediating inner membrane fusion and maintaining the cristae structure. OPA1 is expressed in multiple variant forms through alternative splicing and post-translational proteolytic cleavage, but the functional differences between these variants have not been completely understood. Recent studies generated new information regarding the role of OPA1 cleavage. In this review, we will first provide a brief overview of mitochondrial membrane dynamics by describing fission and fusion that are mediated by mitochondrial dynamins. The second part describes OPA1-mediated fusion and energetic maintenance, the role of OPA1 cleavage, and a new development in OPA1 function, in which we will provide new insight for what OPA1 does and what proteolytic cleavage of OPA1 is for.
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Affiliation(s)
- Hakjoo Lee
- Department of Physiology, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA.
| | - Yisang Yoon
- Department of Physiology, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA.
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197
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Loss of Mitochondrial AAA Proteases AFG3L2 and YME1L Impairs Mitochondrial Structure and Respiratory Chain Biogenesis. Int J Mol Sci 2018; 19:ijms19123930. [PMID: 30544562 PMCID: PMC6321463 DOI: 10.3390/ijms19123930] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 11/28/2018] [Accepted: 12/04/2018] [Indexed: 12/16/2022] Open
Abstract
Mitochondrial protein quality control is crucial for the maintenance of correct mitochondrial homeostasis. It is ensured by several specific mitochondrial proteases located across the various mitochondrial subcompartments. Here, we focused on characterization of functional overlap and cooperativity of proteolytic subunits AFG3L2 (AFG3 Like Matrix AAA Peptidase Subunit 2) and YME1L (YME1 like ATPase) of mitochondrial inner membrane AAA (ATPases Associated with diverse cellular Activities) complexes in the maintenance of mitochondrial structure and respiratory chain integrity. We demonstrate that loss of AFG3L2 and YME1L, both alone and in combination, results in diminished cell proliferation, fragmentation of mitochondrial reticulum, altered cristae morphogenesis, and defective respiratory chain biogenesis. The double AFG3L2/YME1L knockdown cells showed marked upregulation of OPA1 protein forms, with the most prominent increase in short OPA1 (optic atrophy 1). Loss of either protease led to marked elevation in OMA1 (OMA1 zinc metallopeptidase) (60 kDa) and severe reduction in the SPG7 (paraplegin) subunit of the m-AAA complex. Loss of the YME1L subunit led to an increased Drp1 level in mitochondrial fractions. While loss of YME1L impaired biogenesis and function of complex I, knockdown of AFG3L2 mainly affected the assembly and function of complex IV. Our results suggest cooperative and partly redundant functions of AFG3L2 and YME1L in the maintenance of mitochondrial structure and respiratory chain biogenesis and stress the importance of correct proteostasis for mitochondrial integrity.
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198
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Loro E, Bisetto S, Khurana TS. Mitochondrial ultrastructural adaptations in fast muscles of mice lacking IL15RA. J Cell Sci 2018; 131:jcs.218313. [PMID: 30301784 DOI: 10.1242/jcs.218313] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 10/01/2018] [Indexed: 12/18/2022] Open
Abstract
The pro-inflammatory cytokine interleukin-15 (IL15) and its receptor α (IL15RA) participate in the regulation of musculoskeletal function and metabolism. Deletion of the Il15ra gene in mice increases spontaneous activity, improves fatigue resistance in the glycolytic extensor digitorum longus (EDL) and protects from diet-induced obesity. In humans, IL15RA single-nucleotide polymorphisms (SNPs) have been linked to muscle strength, metabolism and performance in elite endurance athletes. Taken together, these features suggest a possible role for IL15RA in muscle mitochondrial structure and function. Here, we have investigated the consequences of loss of IL15RA on skeletal muscle fiber-type properties and mitochondrial ultrastructure. Immunostaining of the EDL for myosin heavy chain (MyHC) isoforms revealed no significant changes in fiber type. Electron microscopy (EM) analysis of the EDL indicated an overall higher mitochondria content, and increased cristae density in subsarcolemmal and A-band mitochondrial subpopulations. The higher cristae density in Il15ra -/- mitochondria was associated with higher OPA1 and cardiolipin levels. Overall, these data extend our understanding of the role of IL15RA signaling in muscle oxidative metabolism and adaptation to exercise.
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Affiliation(s)
- Emanuele Loro
- Department of Physiology and Pennsylvania Muscle Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Sara Bisetto
- Department of Pathology, Anatomy, and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Tejvir S Khurana
- Department of Physiology and Pennsylvania Muscle Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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199
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De R, Sarkar S, Mazumder S, Debsharma S, Siddiqui AA, Saha SJ, Banerjee C, Nag S, Saha D, Pramanik S, Bandyopadhyay U. Macrophage migration inhibitory factor regulates mitochondrial dynamics and cell growth of human cancer cell lines through CD74-NF-κB signaling. J Biol Chem 2018; 293:19740-19760. [PMID: 30366984 DOI: 10.1074/jbc.ra118.003935] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 09/25/2018] [Indexed: 12/13/2022] Open
Abstract
The indispensable role of macrophage migration inhibitory factor (MIF) in cancer cell proliferation is unambiguous, although which specific roles the cytokine plays to block apoptosis by preserving cell growth is still obscure. Using different cancer cell lines (AGS, HepG2, HCT116, and HeLa), here we report that the silencing of MIF severely deregulated mitochondrial structural dynamics by shifting the balance toward excess fission, besides inducing apoptosis with increasing sub-G0 cells. Furthermore, enhanced mitochondrial Bax translocation along with cytochrome c release, down-regulation of Bcl-xL, and Bcl-2 as well as up-regulation of Bad, Bax, and p53 indicated the activation of a mitochondrial pathway of apoptosis upon MIF silencing. The data also indicate a concerted down-regulation of Opa1 and Mfn1 along with a significant elevation of Drp1, cumulatively causing mitochondrial fragmentation upon MIF silencing. Up-regulation of Drp1 was found to be further coupled with fissogenic serine 616 phosphorylation and serine 637 dephosphorylation, thus ensuring enhanced mitochondrial translocation. Interestingly, MIF silencing was found to be associated with decreased NF-κB activation. In fact, NF-κB knockdown in turn increased mitochondrial fission and cell death. In addition, the silencing of CD74, the cognate receptor of MIF, remarkably increased mitochondrial fragmentation in addition to preventing cell proliferation, inducing mitochondrial depolarization, and increasing apoptotic cell death. This indicates the active operation of a MIF-regulated CD74-NF-κB signaling axis for maintaining mitochondrial stability and cell growth. Thus, we propose that MIF, through CD74, constitutively activates NF-κB to control mitochondrial dynamics and stability for promoting carcinogenesis via averting apoptosis.
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Affiliation(s)
- Rudranil De
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Souvik Sarkar
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Somnath Mazumder
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Subhashis Debsharma
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Asim Azhar Siddiqui
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Shubhra Jyoti Saha
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Chinmoy Banerjee
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Shiladitya Nag
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Debanjan Saha
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Saikat Pramanik
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
| | - Uday Bandyopadhyay
- From the Division of Infectious Diseases and Immunology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032, West Bengal, India
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200
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Abstract
Mitochondria undergo continuous challenges in the course of their life, from their generation to their degradation. These challenges include the management of reactive oxygen species, the proper assembly of mitochondrial respiratory complexes and the need to balance potential mutations in the mitochondrial DNA. The detection of damage and the ability to keep it under control is critical to fine-tune mitochondrial function to the organismal energy needs. In this review, we will analyze the multiple mechanisms that safeguard mitochondrial function in light of in crescendo damage. This sequence of events will include initial defense against excessive reactive oxygen species production, compensation mechanisms by the unfolded protein response (UPRmt), mitochondrial dynamics and elimination by mitophagy.
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Affiliation(s)
- Miriam Valera-Alberni
- Nestlé Institute of Health Sciences (NIHS), EPFL Innovation Park, 1015 Lausanne.,School of Life Sciences, EPFL, 1015 Lausanne
| | - Carles Canto
- Nestlé Institute of Health Sciences (NIHS), EPFL Innovation Park, 1015 Lausanne.,School of Life Sciences, EPFL, 1015 Lausanne
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