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Blackout in the powerhouse: clinical phenotypes associated with defects in the assembly of OXPHOS complexes and the mitoribosome. Biochem J 2021; 477:4085-4132. [PMID: 33151299 PMCID: PMC7657662 DOI: 10.1042/bcj20190767] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 09/29/2020] [Accepted: 10/05/2020] [Indexed: 12/26/2022]
Abstract
Mitochondria produce the bulk of the energy used by almost all eukaryotic cells through oxidative phosphorylation (OXPHOS) which occurs on the four complexes of the respiratory chain and the F1–F0 ATPase. Mitochondrial diseases are a heterogenous group of conditions affecting OXPHOS, either directly through mutation of genes encoding subunits of OXPHOS complexes, or indirectly through mutations in genes encoding proteins supporting this process. These include proteins that promote assembly of the OXPHOS complexes, the post-translational modification of subunits, insertion of cofactors or indeed subunit synthesis. The latter is important for all 13 of the proteins encoded by human mitochondrial DNA, which are synthesised on mitochondrial ribosomes. Together the five OXPHOS complexes and the mitochondrial ribosome are comprised of more than 160 subunits and many more proteins support their biogenesis. Mutations in both nuclear and mitochondrial genes encoding these proteins have been reported to cause mitochondrial disease, many leading to defective complex assembly with the severity of the assembly defect reflecting the severity of the disease. This review aims to act as an interface between the clinical and basic research underpinning our knowledge of OXPHOS complex and ribosome assembly, and the dysfunction of this process in mitochondrial disease.
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Miao J, Mu W, Bi Y, Zhang Y, Zhang S, Song J, Liu X. Heterokaryotic state of a point mutation (H249Y) in SDHB protein drives the evolution of thifluzamide resistance in Rhizoctonia solani. PEST MANAGEMENT SCIENCE 2021; 77:1392-1400. [PMID: 33098218 DOI: 10.1002/ps.6155] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 10/14/2020] [Accepted: 10/23/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Sheath blight, caused by Rhizoctonia solani, can be effectively controlled by application of the succinate dehydrogenase inhibitor thifluzamide. Although the risk of resistance to thifluzamide in R. solani had been reported, the thifluzamide-resistance mechanism and the evolution of thifluzamide-resistance in R. solani have not been investigated in detail. RESULTS No differences were found between the sequences of proteins SDHA, SDHC, and SDHD in thifluzamide-sensitive isolates and thifluzamide-resistant mutants, but a single point mutation H249Y was found in SDHB. Two different types of thifluzamide-resistant R. solani mutants were characterized: homokaryotic, carrying only the resistance allele; and heterokaryotic, retaining the wild-type allele in addition to the resistance allele. The resistance level differed according to the nuclear composition at codon 249 in the sdhB gene. Molecular docking results suggested that the point mutation (H249Y) might significantly alter the affinity of thifluzamide and SDHB protein. Heterokaryotic mutants were able to evolve into a homokaryon when repeatedly cultured on agar media or rice plants in the presence of thifluzamide, but thifluzamide treatment had no effect on the genotypes of homokaryotic mutants or sensitive isolates. CONCLUSION This study showed that H249Y in SDHB protein could cause thifluzamide resistance in R. solani. Fungicide application could promote heterokaryotic mutants to evolve into a homokaryon. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Jianqiang Miao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, China
- Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Wenjun Mu
- Department of Plant Pathology, China Agricultural University, Beijing, China
- Key Laboratory of Eco-Environment and Leaf Tobacco Quality, Zhengzhou Tobacco Research Institute of China National Tobacco Corporation, Zhengzhou, China
| | - Yang Bi
- Department of Plant Pathology, China Agricultural University, Beijing, China
- Beijing Key Laboratory of New Technology in Agricultural Application, Beijing University of Agriculture, Beijing, China
| | - Yanling Zhang
- Key Laboratory of Eco-Environment and Leaf Tobacco Quality, Zhengzhou Tobacco Research Institute of China National Tobacco Corporation, Zhengzhou, China
| | - Shaoliang Zhang
- Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Jizhen Song
- Key Laboratory of Eco-Environment and Leaf Tobacco Quality, Zhengzhou Tobacco Research Institute of China National Tobacco Corporation, Zhengzhou, China
| | - Xili Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, China
- Department of Plant Pathology, China Agricultural University, Beijing, China
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Patergnani S, Bouhamida E, Leo S, Pinton P, Rimessi A. Mitochondrial Oxidative Stress and "Mito-Inflammation": Actors in the Diseases. Biomedicines 2021; 9:biomedicines9020216. [PMID: 33672477 PMCID: PMC7923430 DOI: 10.3390/biomedicines9020216] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 02/16/2021] [Accepted: 02/18/2021] [Indexed: 12/18/2022] Open
Abstract
A decline in mitochondrial redox homeostasis has been associated with the development of a wide range of inflammatory-related diseases. Continue discoveries demonstrate that mitochondria are pivotal elements to trigger inflammation and stimulate innate immune signaling cascades to intensify the inflammatory response at front of different stimuli. Here, we review the evidence that an exacerbation in the levels of mitochondrial-derived reactive oxygen species (ROS) contribute to mito-inflammation, a new concept that identifies the compartmentalization of the inflammatory process, in which the mitochondrion acts as central regulator, checkpoint, and arbitrator. In particular, we discuss how ROS contribute to specific aspects of mito-inflammation in different inflammatory-related diseases, such as neurodegenerative disorders, cancer, pulmonary diseases, diabetes, and cardiovascular diseases. Taken together, these observations indicate that mitochondrial ROS influence and regulate a number of key aspects of mito-inflammation and that strategies directed to reduce or neutralize mitochondrial ROS levels might have broad beneficial effects on inflammatory-related diseases.
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Affiliation(s)
- Simone Patergnani
- Department of Medical Sciences and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy; (S.P.); (E.B.); (S.L.); (P.P.)
| | - Esmaa Bouhamida
- Department of Medical Sciences and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy; (S.P.); (E.B.); (S.L.); (P.P.)
| | - Sara Leo
- Department of Medical Sciences and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy; (S.P.); (E.B.); (S.L.); (P.P.)
| | - Paolo Pinton
- Department of Medical Sciences and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy; (S.P.); (E.B.); (S.L.); (P.P.)
- Center of Research for Innovative Therapies in Cystic Fibrosis, University of Ferrara, 44121 Ferrara, Italy
| | - Alessandro Rimessi
- Department of Medical Sciences and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy; (S.P.); (E.B.); (S.L.); (P.P.)
- Center of Research for Innovative Therapies in Cystic Fibrosis, University of Ferrara, 44121 Ferrara, Italy
- Correspondence:
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104
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Functions of ROS in Macrophages and Antimicrobial Immunity. Antioxidants (Basel) 2021; 10:antiox10020313. [PMID: 33669824 PMCID: PMC7923022 DOI: 10.3390/antiox10020313] [Citation(s) in RCA: 216] [Impact Index Per Article: 72.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 02/07/2023] Open
Abstract
Reactive oxygen species (ROS) are a chemically defined group of reactive molecules derived from molecular oxygen. ROS are involved in a plethora of processes in cells in all domains of life, ranging from bacteria, plants and animals, including humans. The importance of ROS for macrophage-mediated immunity is unquestioned. Their functions comprise direct antimicrobial activity against bacteria and parasites as well as redox-regulation of immune signaling and induction of inflammasome activation. However, only a few studies have performed in-depth ROS analyses and even fewer have identified the precise redox-regulated target molecules. In this review, we will give a brief introduction to ROS and their sources in macrophages, summarize the versatile roles of ROS in direct and indirect antimicrobial immune defense, and provide an overview of commonly used ROS probes, scavengers and inhibitors.
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105
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Hvozda Arana AG, Lasagni Vitar RM, Reides CG, Calabró V, Marchini T, Lerner SF, Evelson PA, Ferreira SM. Mitochondrial function is impaired in the primary visual cortex in an experimental glaucoma model. Arch Biochem Biophys 2021; 701:108815. [PMID: 33609537 DOI: 10.1016/j.abb.2021.108815] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 02/05/2021] [Accepted: 02/08/2021] [Indexed: 12/16/2022]
Abstract
Glaucoma is a neurodegenerative disease that affects eye structures and brain areas related to the visual system. Oxidative stress plays a key role in the development and progression of the disease. The aims of the present study were to evaluate the mitochondrial function and its participation in the brain redox metabolism in an experimental glaucoma model. 3-month-old female Wistar rats were subjected to cauterization of two episcleral veins of the left eye to elevate the intraocular pressure. Seven days after surgery, animals were sacrificed, the brain was carefully removed and the primary visual cortex was dissected. Mitochondrial bioenergetics and ROS production, and the antioxidant enzyme defenses from both mitochondrial and cytosolic fractions were evaluated. When compared to control, glaucoma decreased mitochondrial ATP production (23%, p < 0.05), with an increase in superoxide and hydrogen peroxide production (30%, p < 0.01 and 28%, p < 0.05, respectively), whereas no changes were observed in membrane potential and oxygen consumption rate. In addition, the glaucoma group displayed a decrease in complex II activity (34%, p < 0.01). Moreover, NOX4 expression was increased in glaucoma compared to the control group (27%, p < 0.05). Regarding the activity of enzymes associated with the regulation of the redox status, glaucoma showed an increase in mitochondrial SOD activity (34%, p < 0.05), mostly due to an increase in Mn-SOD (50%, p < 0.05). A decrease in mitochondrial GST activity was observed (11%, p < 0.05). GR and TrxR activity were decreased in both mitochondrial (16%, p < 0.05 and 20%, p < 0.05 respectively) and cytosolic (21%, p < 0.01 and 50%, p < 0.01 respectively) fractions in the glaucoma group. Additionally, glaucoma showed an increase in cytoplasmatic GPx (50%, p < 0.01). In this scenario, redox imbalance took place resulting in damage to mitochondrial lipids (39%, p < 0.01) and proteins (70%, p < 0.05). These results suggest that glaucoma leads to mitochondrial function impairment in brain visual targets, that is accompanied by an alteration in both mitochondrial and cytoplasmatic enzymatic defenses. As a consequence of redox imbalance, oxidative damage to macromolecules takes place and can further affect vital cellular functions. Understanding the role of the mitochondria in the development and progression of the disease could bring up new neuroprotective therapies.
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Affiliation(s)
- Ailen G Hvozda Arana
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Analítica y Fisicoquímica, Cátedra de Química General e Inorgánica, Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, Instituto de Bioquímica y Medicina Molecular (IBIMOL), Buenos Aires, Argentina.
| | - Romina M Lasagni Vitar
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Analítica y Fisicoquímica, Cátedra de Química General e Inorgánica, Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, Instituto de Bioquímica y Medicina Molecular (IBIMOL), Buenos Aires, Argentina
| | - Claudia G Reides
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Analítica y Fisicoquímica, Cátedra de Química General e Inorgánica, Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, Instituto de Bioquímica y Medicina Molecular (IBIMOL), Buenos Aires, Argentina
| | - Valeria Calabró
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Analítica y Fisicoquímica, Cátedra de Química General e Inorgánica, Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, Instituto de Bioquímica y Medicina Molecular (IBIMOL), Buenos Aires, Argentina
| | - Timoteo Marchini
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Analítica y Fisicoquímica, Cátedra de Química General e Inorgánica, Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, Instituto de Bioquímica y Medicina Molecular (IBIMOL), Buenos Aires, Argentina
| | - S Fabián Lerner
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Analítica y Fisicoquímica, Cátedra de Química General e Inorgánica, Buenos Aires, Argentina
| | - Pablo A Evelson
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Analítica y Fisicoquímica, Cátedra de Química General e Inorgánica, Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, Instituto de Bioquímica y Medicina Molecular (IBIMOL), Buenos Aires, Argentina
| | - Sandra M Ferreira
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Analítica y Fisicoquímica, Cátedra de Química General e Inorgánica, Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, Instituto de Bioquímica y Medicina Molecular (IBIMOL), Buenos Aires, Argentina.
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106
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Alassaf A, Mignotte B. [Lysosomal signaling allows interorganelle cross-talk that optimizes metabolic activity and redox homeostasis, and increases longevity in Caenorhabditis elegans]. Med Sci (Paris) 2021; 37:192-193. [PMID: 33591264 DOI: 10.1051/medsci/2020284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Assaf Alassaf
- M1 Biologie Santé, Université Paris-Saclay, 91405 Orsay, France
| | - Bernard Mignotte
- Université Paris-Saclay, UVSQ, LGBC, 78000, Versailles, France - École pratique des hautes études, PSL University, 75014, Paris, France
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107
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Su L, Wang R, Qiu T, Wang J, Meng J, Zhu J, Wang D, Wu Y, Liu J. The protective effect of baicalin on duck hepatitis A virus type 1-induced duck hepatic mitochondria dysfunction by activating nuclear erythroid 2-related factor 2/antioxidant responsive element signaling pathway. Poult Sci 2021; 100:101032. [PMID: 33744612 PMCID: PMC8010464 DOI: 10.1016/j.psj.2021.101032] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 01/09/2021] [Accepted: 01/21/2021] [Indexed: 01/21/2023] Open
Abstract
Duck hepatitis A virus type 1 (DHAV-1) is the main pathogen of duck viral hepatitis, but the efficacy of the licensed commercial vaccine needs to be further improved. Therapeutic measures of specific drugs for DHAV-1-infected ducklings need to be urgently developed. Baicalin possesses good antiviral effects. This study aims to investigate the mechanism of baicalin in protecting hepatic mitochondrial function from DHAV-1. The ELISA method was used to detect changes of hepatic and mitochondrial catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GPX), inducible nitric oxide synthase (iNOS), adenosine triphosphate (ATP), and malondialdehyde (MDA) levels in vivo and vitro. Hematoxylin and eosin sections and transmission electron microscopy were used to observe liver pathological changes and mitochondrial structural changes. The changes in mitochondrial membrane potential were detected by JC-1 staining method. Western blot and quantitative real-time PCR were employed to analyze the gene and protein expressions in the nuclear erythroid 2-related factor 2 (Nrf2)/antioxidant responsive element (ARE) pathway in duck embryonic hepatocytes infected with DHAV-1. Results showed the administration of baicalin increased the survival rate of ducklings, and alleviated hepatic damage caused by DHAV-1 by enhancing the antioxidant enzyme activities of the liver and mitochondria, including SOD, GPX, CAT, and reducing lipid peroxidative damage (MDA content) and iNOS activities. The mitochondrial ultrastructure changed and the significant increase of ATP content showed that baicalin maintained the structural integrity and ameliorated mitochondrial dysfunction after DHAV-1 infection. In vitro, DHAV-1 infection led to loss of mitochondrial membrane potential and lipid peroxidation and decreased antioxidative enzyme activities (SOD, GPX) and mitochondrial respiratory chain complex activities (succinate dehydrogenase, cytochrome c oxidase). Baicalin relieved the above changes caused by DHAV-1 and activated the gene and protein expressions of Nrf2, which activated ARE-dependent genes including heme oxygenase-1 (HO-1), nicotinamide adenine dinucleotide phosphate quinone oxidoreductase 1 (NQO1), SOD-1, and GPX-1. In addition, baicalin increased the protein expressions of antioxidative enzymes (SOD, GPX). Hence, baicalin protects the liver against oxidative stress in hepatic mitochondria caused by DHAV-1 via activating the Nrf2/ARE signaling pathway.
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Affiliation(s)
- Linglin Su
- MOE Joint International Research Laboratory of Animal Health and Food Safety and Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P R China
| | - Rui Wang
- MOE Joint International Research Laboratory of Animal Health and Food Safety and Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P R China
| | - Tianxin Qiu
- MOE Joint International Research Laboratory of Animal Health and Food Safety and Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P R China
| | - Jinli Wang
- MOE Joint International Research Laboratory of Animal Health and Food Safety and Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P R China
| | - Jinwu Meng
- MOE Joint International Research Laboratory of Animal Health and Food Safety and Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P R China
| | - Jinyue Zhu
- MOE Joint International Research Laboratory of Animal Health and Food Safety and Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P R China
| | - Deyun Wang
- MOE Joint International Research Laboratory of Animal Health and Food Safety and Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P R China
| | - Yi Wu
- MOE Joint International Research Laboratory of Animal Health and Food Safety and Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P R China
| | - Jiaguo Liu
- MOE Joint International Research Laboratory of Animal Health and Food Safety and Institute of Traditional Chinese Veterinary Medicine, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, P R China.
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Kanojia U, Chaturbhuj SG, Sankhe R, Das M, Surubhotla R, Krishnadas N, Gourishetti K, Nayak PG, Kishore A. Beta-Caryophyllene, a CB2R Selective Agonist, Protects Against Cognitive Impairment Caused by Neuro-inflammation and Not in Dementia Due to Ageing Induced by Mitochondrial Dysfunction. CNS & NEUROLOGICAL DISORDERS DRUG TARGETS 2021; 20:963-974. [PMID: 33530917 DOI: 10.2174/1871527320666210202121103] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 10/09/2020] [Accepted: 11/30/2020] [Indexed: 01/24/2023]
Abstract
BACKGROUND Dementia is a neurodegenerative disorder majorly evidenced by cognitive impairment. Although there are many types of dementia, the common underlying etiological factors in all the types are neuro-inflammation or aging induced apoptosis. β-caryophyllene, a cannabinoid type-2 receptor agonist, has been reported to have promising neuroprotective effects in cerebral ischemia and neuro-inflammation. OBJECTIVE In the present study, we evaluated the effects of β-caryophyllene against animal models of dementia whose etiology mimicked neuro-inflammation and aging. METHODS Two doses (50 and 100 mg/kg of body weight) of β-caryophyllene given orally were tested against AlCl3-induced dementia in male Sprague Dawley (SD) rats using the Morris water maze test. Subsequently, the effect of the drug was assessed for episodic memory in female SD rats using novel object recognition task in doxorubicin-induced neuro-inflammation and chemobrain model. Moreover, its effects were evaluated in D-galactose-induced mitochondrial dysfunction leading to dementia. RESULTS β-caryophyllene, at both doses, showed significant improvement in memory when assessed using parameters like target quadrant entries, escape latency and path efficiency in the Morris water maze test for spatial memory. In the doxorubicin-induced chemobrain model, β-caryophyllene at 100 mg/kg significantly elevated acetylcholinesterase and catalase levels and lowered lipid peroxidation compared to the disease control. In the novel object recognition task, β-caryophyllene at 100 mg/kg significantly improved recognition index and discrimination index in the treated animals compared to the disease control, with a significant increase in catalase and a decrease in lipid peroxidation in both hippocampus and frontal cortex. However, in the D-galactose-induced mitochondrial dysfunction model, β-caryophyllene failed to show positive effects when spatial memory was assessed. It also failed to improve D-galactose-induced diminished mitochondrial complex I and II activities. CONCLUSION Hence, we conclude that β-caryophyllene at 100 mg/kg protects against dementia induced by neuro-inflammation with no effect on neuronal aging induced by mitochondrial dysfunction.
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Affiliation(s)
- Urja Kanojia
- Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India
| | - Shrikant Gyaneshwar Chaturbhuj
- Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India
| | - Runali Sankhe
- Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India
| | - Maushami Das
- Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India
| | - Raviteja Surubhotla
- Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India
| | - Nandakumar Krishnadas
- Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India
| | - Karthik Gourishetti
- Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India
| | - Pawan Ganesh Nayak
- Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India
| | - Anoop Kishore
- Department of Pharmacology, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal-576104, Karnataka, India
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109
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Ranganayaki S, Jamshidi N, Aiyaz M, Rashmi SK, Gayathri N, Harsha PK, Padmanabhan B, Srinivas Bharath MM. Inhibition of mitochondrial complex II in neuronal cells triggers unique pathways culminating in autophagy with implications for neurodegeneration. Sci Rep 2021; 11:1483. [PMID: 33452321 PMCID: PMC7810707 DOI: 10.1038/s41598-020-79339-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 11/23/2020] [Indexed: 02/08/2023] Open
Abstract
Mitochondrial dysfunction and neurodegeneration underlie movement disorders such as Parkinson’s disease, Huntington’s disease and Manganism among others. As a corollary, inhibition of mitochondrial complex I (CI) and complex II (CII) by toxins 1-methyl-4-phenylpyridinium (MPP+) and 3-nitropropionic acid (3-NPA) respectively, induced degenerative changes noted in such neurodegenerative diseases. We aimed to unravel the down-stream pathways associated with CII inhibition and compared with CI inhibition and the Manganese (Mn) neurotoxicity. Genome-wide transcriptomics of N27 neuronal cells exposed to 3-NPA, compared with MPP+ and Mn revealed varied transcriptomic profile. Along with mitochondrial and synaptic pathways, Autophagy was the predominant pathway differentially regulated in the 3-NPA model with implications for neuronal survival. This pathway was unique to 3-NPA, as substantiated by in silico modelling of the three toxins. Morphological and biochemical validation of autophagy markers in the cell model of 3-NPA revealed incomplete autophagy mediated by mechanistic Target of Rapamycin Complex 2 (mTORC2) pathway. Interestingly, Brain Derived Neurotrophic Factor (BDNF), which was elevated in the 3-NPA model could confer neuroprotection against 3-NPA. We propose that, different downstream events are activated upon neurotoxin-dependent CII inhibition compared to other neurotoxins, with implications for movement disorders and regulation of autophagy could potentially offer neuroprotection.
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Affiliation(s)
- Sathyanarayanan Ranganayaki
- Department of Neurochemistry, National Institute of Mental Health and Neurosciences (NIMHANS), No. 2900, Hosur Road, Bangalore, Karnataka, 560029, India
| | - Neema Jamshidi
- Department of Radiological Sciences, Ronald Reagan UCLA Medical Center, Los Angeles, CA, 90095, USA
| | - Mohamad Aiyaz
- Genotypic Technology Pvt. Ltd., 2/13, Balaji Complex, 80 feet Road, RMV 2nd Stage, Bangalore, Karnataka, 560094, India
| | - Santhosh-Kumar Rashmi
- Department of Neuropathology, NIMHANS, No. 2900, Hosur Road, Bangalore, Karnataka, 560029, India
| | - Narayanappa Gayathri
- Department of Neuropathology, NIMHANS, No. 2900, Hosur Road, Bangalore, Karnataka, 560029, India
| | - Pulleri Kandi Harsha
- Department of Neurovirology, NIMHANS, No. 2900, Hosur Road, Bangalore, Karnataka, 560029, India
| | | | - Muchukunte Mukunda Srinivas Bharath
- Department of Clinical Psychopharmacology and Neurotoxicology, National Institute of Mental Health and Neurosciences (NIMHANS), No. 2900, Hosur Road, Bangalore, Karnataka, 560029, India.
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Sedley L. Advances in Nutritional Epigenetics-A Fresh Perspective for an Old Idea. Lessons Learned, Limitations, and Future Directions. Epigenet Insights 2020; 13:2516865720981924. [PMID: 33415317 PMCID: PMC7750768 DOI: 10.1177/2516865720981924] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 11/25/2020] [Indexed: 12/11/2022] Open
Abstract
Nutritional epigenetics is a rapidly expanding field of research, and the natural modulation of the genome is a non-invasive, sustainable, and personalized alternative to gene-editing for chronic disease management. Genetic differences and epigenetic inflexibility resulting in abnormal gene expression, differential or aberrant methylation patterns account for the vast majority of diseases. The expanding understanding of biological evolution and the environmental influence on epigenetics and natural selection requires relearning of once thought to be well-understood concepts. This research explores the potential for natural modulation by the less understood epigenetic modifications such as ubiquitination, nitrosylation, glycosylation, phosphorylation, and serotonylation concluding that the under-appreciated acetylation and mitochondrial dependant downstream epigenetic post-translational modifications may be the pinnacle of the epigenomic hierarchy, essential for optimal health, including sustainable cellular energy production. With an emphasis on lessons learned, this conceptional exploration provides a fresh perspective on methylation, demonstrating how increases in environmental methane drive an evolutionary down regulation of endogenous methyl groups synthesis and demonstrates how epigenetic mechanisms are cell-specific, making supplementation with methyl cofactors throughout differentiation unpredictable. Interference with the epigenomic hierarchy may result in epigenetic inflexibility, symptom relief and disease concomitantly and may be responsible for the increased incidence of neurological disease such as autism spectrum disorder.
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Affiliation(s)
- Lynda Sedley
- Bachelor of Health Science (Nutritional Medicine),
GC Biomedical Science (Genomics), The Research and Educational Institute of
Environmental and Nutritional Epigenetics, Queensland, Australia
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111
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Valdez M, Valdez JM, Freeborn D, Johnstone AFM, Kodavanti PRS. The effects of ozone exposure and sedentary lifestyle on neuronal microglia and mitochondrial bioenergetics of female Long-Evans rats. Toxicol Appl Pharmacol 2020; 408:115254. [PMID: 32991914 PMCID: PMC7730534 DOI: 10.1016/j.taap.2020.115254] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 09/07/2020] [Accepted: 09/24/2020] [Indexed: 11/27/2022]
Abstract
Ozone (O3) is a widespread air pollutant that produces cardiovascular and pulmonary dysfunction possibly mediated by activation of central stress centers. Epidemiological data suggest that sedentary lifestyles may exacerbate responses to air pollutants such as O3. We sought to assess neurological changes in response to O3 exposure and an active lifestyle. We developed an animal model in which female Long-Evans rats were either sedentary or active with continuous access to running wheels starting at postnatal day (PND) 22 until the age of PND 100 and then exposed to O3 (0, 0.25, 0.5 or 1.0 ppm) 5 h/day for two consecutive days. We found significantly more reactive microglia within the hippocampus (HIP) in animals exposed to O3 in both sedentary and active rats. No changes were detected in astrocytic coverage. We next analyzed mitochondrial bioenergetic parameters (complex I, complex II and complex IV). Complex I activity was significantly affected by exercise in hypothalamus (HYP). Complex II activity was significantly affected by both exercise and O3 exposure in the HIP. Concomitant with the changes in enzymatic activity, there were also effects on expression of genes related to mitochondrial bioenergetics and antioxidant production. These results demonstrate that O3 induces microglia reactivity within stress centers of the brain and that mitochondrial bioenergetics are altered. Some of these effects may be augmented by exercise, suggesting a role for lifestyle in O3 effects on brain mitochondrial bioenergetics parameters in agreement with our previous reports on other endpoints.
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Affiliation(s)
- Matthew Valdez
- Neurological and Endocrine Toxicology Branch, Public Health and Integrated Toxicology Division, Center for Public Health and Environmental Assessment, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA; Oak Ridge Institute for Science and Education, U.S. Department of Energy, Oak Ridge, TN 37831, United States of America
| | - Joseph M Valdez
- Neurological and Endocrine Toxicology Branch, Public Health and Integrated Toxicology Division, Center for Public Health and Environmental Assessment, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA
| | - Danielle Freeborn
- Neurological and Endocrine Toxicology Branch, Public Health and Integrated Toxicology Division, Center for Public Health and Environmental Assessment, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA
| | - Andrew F M Johnstone
- Neurological and Endocrine Toxicology Branch, Public Health and Integrated Toxicology Division, Center for Public Health and Environmental Assessment, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA
| | - Prasada Rao S Kodavanti
- Neurological and Endocrine Toxicology Branch, Public Health and Integrated Toxicology Division, Center for Public Health and Environmental Assessment, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA.
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112
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Role of tyrosine phosphorylation in modulating cancer cell metabolism. Biochim Biophys Acta Rev Cancer 2020; 1874:188442. [DOI: 10.1016/j.bbcan.2020.188442] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 09/22/2020] [Accepted: 09/29/2020] [Indexed: 12/18/2022]
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113
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Branca JJV, Pacini A, Gulisano M, Taddei N, Fiorillo C, Becatti M. Cadmium-Induced Cytotoxicity: Effects on Mitochondrial Electron Transport Chain. Front Cell Dev Biol 2020; 8:604377. [PMID: 33330504 PMCID: PMC7734342 DOI: 10.3389/fcell.2020.604377] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 11/05/2020] [Indexed: 12/26/2022] Open
Abstract
Cadmium (Cd) is a well-known heavy metal and environmental toxicant and pollutant worldwide, being largely present in every kind of item such as plastic (toys), battery, paints, ceramics, contaminated water, air, soil, food, fertilizers, and cigarette smoke. Nowadays, it represents an important research area for the scientific community mainly for its effects on public health. Due to a half-life ranging between 15 and 30 years, Cd owns the ability to accumulate in organs and tissues, exerting deleterious effects. Thus, even at low doses, a Cd prolonged exposure may cause a multiorgan toxicity. Mitochondria are key intracellular targets for Cd-induced cytotoxicity, but the underlying mechanisms are not fully elucidated. The present review is aimed to clarify the effects of Cd on mitochondria and, particularly, on the mitochondrial electron transport chain.
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Affiliation(s)
- Jacopo Junio Valerio Branca
- Department of Experimental and Clinical Medicine, Anatomy and Histology Section, University of Firenze, Firenze, Italy
| | - Alessandra Pacini
- Department of Experimental and Clinical Medicine, Anatomy and Histology Section, University of Firenze, Firenze, Italy
| | - Massimo Gulisano
- Department of Experimental and Clinical Medicine, Anatomy and Histology Section, University of Firenze, Firenze, Italy
| | - Niccolò Taddei
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Firenze, Firenze, Italy
| | - Claudia Fiorillo
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Firenze, Firenze, Italy
| | - Matteo Becatti
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Firenze, Firenze, Italy
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114
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Role of Metabolism in Bone Development and Homeostasis. Int J Mol Sci 2020; 21:ijms21238992. [PMID: 33256181 PMCID: PMC7729585 DOI: 10.3390/ijms21238992] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 11/22/2020] [Accepted: 11/25/2020] [Indexed: 02/07/2023] Open
Abstract
Carbohydrates, fats, and proteins are the underlying energy sources for animals and are catabolized through specific biochemical cascades involving numerous enzymes. The catabolites and metabolites in these metabolic pathways are crucial for many cellular functions; therefore, an imbalance and/or dysregulation of these pathways causes cellular dysfunction, resulting in various metabolic diseases. Bone, a highly mineralized organ that serves as a skeleton of the body, undergoes continuous active turnover, which is required for the maintenance of healthy bony components through the deposition and resorption of bone matrix and minerals. This highly coordinated event is regulated throughout life by bone cells such as osteoblasts, osteoclasts, and osteocytes, and requires synchronized activities from different metabolic pathways. Here, we aim to provide a comprehensive review of the cellular metabolism involved in bone development and homeostasis, as revealed by mouse genetic studies.
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115
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Oliveira GL, Coelho AR, Marques R, Oliveira PJ. Cancer cell metabolism: Rewiring the mitochondrial hub. Biochim Biophys Acta Mol Basis Dis 2020; 1867:166016. [PMID: 33246010 DOI: 10.1016/j.bbadis.2020.166016] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/12/2020] [Accepted: 11/15/2020] [Indexed: 12/15/2022]
Abstract
To adapt to tumoral environment conditions or even to escape chemotherapy, cells rapidly reprogram their metabolism to handle adversities and survive. Given the rapid rise of studies uncovering novel insights and therapeutic opportunities based on the role of mitochondria in tumor metabolic programing and therapeutics, this review summarizes most significant developments in the field. Taking in mind the key role of mitochondria on carcinogenesis and tumor progression due to their involvement on tumor plasticity, metabolic remodeling, and signaling re-wiring, those organelles are also potential therapeutic targets. Among other topics, we address the recent data intersecting mitochondria as of prognostic value and staging in cancer, by mitochondrial DNA (mtDNA) determination, and current inhibitors developments targeting mtDNA, OXPHOS machinery and metabolic pathways. We contribute for a holistic view of the role of mitochondria metabolism and directed therapeutics to understand tumor metabolism, to circumvent therapy resistance, and to control tumor development.
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Affiliation(s)
- Gabriela L Oliveira
- CNC-Center for Neuroscience and Cell Biology, UC-Biotech, University of Coimbra, Biocant Park, Cantanhede, Portugal
| | - Ana R Coelho
- CNC-Center for Neuroscience and Cell Biology, UC-Biotech, University of Coimbra, Biocant Park, Cantanhede, Portugal
| | - Ricardo Marques
- CNC-Center for Neuroscience and Cell Biology, UC-Biotech, University of Coimbra, Biocant Park, Cantanhede, Portugal
| | - Paulo J Oliveira
- CNC-Center for Neuroscience and Cell Biology, UC-Biotech, University of Coimbra, Biocant Park, Cantanhede, Portugal.
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116
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Shen Y, Wu Q, Shi J, Zhou S. Regulation of SIRT3 on mitochondrial functions and oxidative stress in Parkinson's disease. Biomed Pharmacother 2020; 132:110928. [PMID: 33128944 DOI: 10.1016/j.biopha.2020.110928] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 10/18/2020] [Accepted: 10/20/2020] [Indexed: 02/06/2023] Open
Abstract
Sirtuin-3 (SIRT3) is a NAD+-dependent protein deacetylase that is located in mitochondria, regulating mitochondrial proteins and maintaining cellular antioxidant status. Increasing evidence demonstrates that SIRT3 plays a role in degenerative disorders including Parkinson's disease (PD), which is a devastating nervous system disease currently with no effective treatments available. Although the etiology of PD is still largely ambiguous, substantial evidence indicates that mitochondrial dysfunction and oxidative stress play major roles in the pathogenesis of PD. The imbalance of reactive oxygen species (ROS) production and detoxification leads to oxidative stress that can accelerate the progression of PD. By causing conformational changes in the deacetylated proteins SIRT3 modulates the activities and biological functions of a variety of proteins involved in mitochondrial antioxidant defense and various mitochondrial functions. Increasingly more studies have suggested that upregulation of SIRT3 confers beneficial effect on neuroprotection in various PD models. This review discusses the mechanism by which SIRT3 regulates intracellular oxidative status and mitochondrial function with an emphasis in discussing in detail the regulation of SIRT3 on each component of the five complexes of the mitochondrial respiratory chain and mitochondrial antioxidant defense, as well as the pharmacological regulation of SIRT3 in light of therapeutic strategies for PD.
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Affiliation(s)
- Yanhua Shen
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnocentric of Ministry of Education, Zunyi Medical University, Zunyi, Guizhou 563003, China
| | - Qin Wu
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnocentric of Ministry of Education, Zunyi Medical University, Zunyi, Guizhou 563003, China
| | - Jingshan Shi
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnocentric of Ministry of Education, Zunyi Medical University, Zunyi, Guizhou 563003, China
| | - Shaoyu Zhou
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnocentric of Ministry of Education, Zunyi Medical University, Zunyi, Guizhou 563003, China.
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117
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Xu Y, Xue D, Bankhead A, Neamati N. Why All the Fuss about Oxidative Phosphorylation (OXPHOS)? J Med Chem 2020; 63:14276-14307. [PMID: 33103432 DOI: 10.1021/acs.jmedchem.0c01013] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Certain subtypes of cancer cells require oxidative phosphorylation (OXPHOS) to survive. Increased OXPHOS dependency is frequently a hallmark of cancer stem cells and cells resistant to chemotherapy and targeted therapies. Suppressing the OXPHOS function might also influence the tumor microenvironment by alleviating hypoxia and improving the antitumor immune response. Thus, targeting OXPHOS is a promising strategy to treat various cancers. A growing arsenal of therapeutic agents is under development to inhibit this biological process. This Perspective provides an overview of the structure and function of OXPHOS complexes, their biological functions in cancer, relevant research tools and models, as well as the limitations of OXPHOS as drug targets. We also focus on the current development status of OXPHOS inhibitors and potential therapeutic strategies to strengthen their clinical applications.
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Affiliation(s)
- Yibin Xu
- Department of Medicinal Chemistry, College of Pharmacy, Rogel Cancer Center, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Ding Xue
- Department of Medicinal Chemistry, College of Pharmacy, Rogel Cancer Center, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Armand Bankhead
- Department of Computational Medicine and Bioinformatics, University of Michigan Medical School, Ann Arbor, Michigan 48109, United States.,Department of Biostatistics, University of Michigan, School of Public Health, Ann Arbor, Michigan 48109, United States
| | - Nouri Neamati
- Department of Medicinal Chemistry, College of Pharmacy, Rogel Cancer Center, University of Michigan, Ann Arbor, Michigan 48109, United States
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118
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Gómez V, Eykyn TR, Mustapha R, Flores-Borja F, Male V, Barber PR, Patsialou A, Green R, Panagaki F, Li CW, Fruhwirth GO, Ros S, Brindle KM, Ng T. Breast cancer-associated macrophages promote tumorigenesis by suppressing succinate dehydrogenase in tumor cells. Sci Signal 2020; 13:eaax4585. [PMID: 33023985 DOI: 10.1126/scisignal.aax4585] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2024]
Abstract
Tumor-associated macrophages (TAMs) can exist in pro- and anti-inflammatory states. Anti-inflammatory TAMs (also referred to as M2-polarized) generally suppress antitumor immune responses and enhance the metastatic progression of cancer. To explore the mechanisms behind this phenomenon, we isolated macrophages from mice and humans, polarized them ex vivo, and examined their functional interaction with breast cancer cells in culture and in mice. We found that anti-inflammatory TAMs promoted a metabolic state in breast cancer cells that supported various protumorigenic phenotypes. Anti-inflammatory TAMs secreted the cytokine TGF-β that, upon engagement of its receptors in breast cancer cells, suppressed the abundance of the transcription factor STAT1 and, consequently, decreased that of the metabolic enzyme succinate dehydrogenase (SDH) in the tumor cells. The decrease in SDH levels in tumor cells resulted in an accumulation of succinate, which enhanced the stability of the transcription factor HIF1α and reprogrammed cell metabolism to a glycolytic state. TAM depletion-repletion experiments in a 4T1 mouse model additionally revealed that anti-inflammatory macrophages promoted HIF-associated vascularization and expression of the immunosuppressive protein PD-L1 in tumors. The findings suggest that anti-inflammatory TAMs promote tumor-associated angiogenesis and immunosuppression by altering metabolism in breast cancer cells.
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Affiliation(s)
- Valentí Gómez
- UCL Cancer Institute, University College London, London WC1E 6DD, UK.
| | - Thomas R Eykyn
- School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, UK
| | - Rami Mustapha
- School of Cancer and Pharmaceutical Sciences, King's College London, London SE1 1UL, UK
| | - Fabián Flores-Borja
- KCL Breast Cancer Now Research Unit, Department of Research Oncology, Guy's Hospital, King's College London, London SE1 1UL, UK
| | - Victoria Male
- Institute of Immunity and Transplantation, Royal Free Hospital, University College London, London NW3 2QG, UK
| | - Paul R Barber
- UCL Cancer Institute, University College London, London WC1E 6DD, UK
| | - Antonia Patsialou
- UCL Cancer Institute, University College London, London WC1E 6DD, UK
| | - Ryan Green
- KCL Breast Cancer Now Research Unit, Department of Research Oncology, Guy's Hospital, King's College London, London SE1 1UL, UK
| | - Fani Panagaki
- School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, UK
| | - Chun W Li
- School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, UK
| | - Gilbert O Fruhwirth
- School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, UK
| | - Susana Ros
- Cancer Research UK Cambridge Institute, University of Cambridge, Li Ka Shing Centre, Cambridge CB2 0RE, UK
| | - Kevin M Brindle
- Cancer Research UK Cambridge Institute, University of Cambridge, Li Ka Shing Centre, Cambridge CB2 0RE, UK
| | - Tony Ng
- UCL Cancer Institute, University College London, London WC1E 6DD, UK.
- School of Cancer and Pharmaceutical Sciences, King's College London, London SE1 1UL, UK
- KCL Breast Cancer Now Research Unit, Department of Research Oncology, Guy's Hospital, King's College London, London SE1 1UL, UK
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119
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Gai Z, Gui T, Kullak-Ublick GA, Li Y, Visentin M. The Role of Mitochondria in Drug-Induced Kidney Injury. Front Physiol 2020; 11:1079. [PMID: 33013462 PMCID: PMC7500167 DOI: 10.3389/fphys.2020.01079] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 08/05/2020] [Indexed: 12/11/2022] Open
Abstract
The kidneys utilize roughly 10% of the body’s oxygen supply to produce the energy required for accomplishing their primary function: the regulation of body fluid composition through secreting, filtering, and reabsorbing metabolites and nutrients. To ensure an adequate ATP supply, the kidneys are particularly enriched in mitochondria, having the second highest mitochondrial content and thus oxygen consumption of our body. The bulk of the ATP generated in the kidneys is consumed to move solutes toward (reabsorption) or from (secretion) the peritubular capillaries through the concerted action of an array of ATP-binding cassette (ABC) pumps and transporters. ABC pumps function upon direct ATP hydrolysis. Transporters are driven by the ion electrochemical gradients and the membrane potential generated by the asymmetric transport of ions across the plasma membrane mediated by the ATPase pumps. Some of these transporters, namely the polyspecific organic anion transporters (OATs), the organic anion transporting polypeptides (OATPs), and the organic cation transporters (OCTs) are highly expressed on the proximal tubular cell membranes and happen to also transport drugs whose levels in the proximal tubular cells can rapidly rise, thereby damaging the mitochondria and resulting in cell death and kidney injury. Drug-induced kidney injury (DIKI) is a growing public health concern and a major cause of drug attrition in drug development and post-marketing approval. As part of the article collection “Mitochondria in Renal Health and Disease,” here, we provide a critical overview of the main molecular mechanisms underlying the mitochondrial damage caused by drugs inducing nephrotoxicity.
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Affiliation(s)
- Zhibo Gai
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan, China.,Department of Clinical Pharmacology and Toxicology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Ting Gui
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Gerd A Kullak-Ublick
- Department of Clinical Pharmacology and Toxicology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.,Mechanistic Safety, CMO & Patient Safety, Global Drug Development, Novartis Pharma, Basel, Switzerland
| | - Yunlun Li
- Innovation Research Institute of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China.,The Third Department of Cardiovascular Diseases, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Michele Visentin
- Department of Clinical Pharmacology and Toxicology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
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120
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Marden JH, Langford EA, Robertson MA, Fescemyer HW. Alleles in metabolic and oxygen-sensing genes are associated with antagonistic pleiotropic effects on life history traits and population fitness in an ecological model insect. Evolution 2020; 75:116-129. [PMID: 32895932 DOI: 10.1111/evo.14095] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 08/22/2020] [Accepted: 09/02/2020] [Indexed: 01/02/2023]
Abstract
Genes with opposing effects on fitness at different life stages are the mechanistic basis for evolutionary theories of aging and life history. Examples come from studies of mutations in model organisms, but there is little knowledge of genetic bases of life history tradeoffs in natural populations. Here, we test the hypothesis that alleles affecting oxygen sensing in Glanville fritillary butterflies have opposing effects on larval versus adult fitness-related traits. Intermediate-frequency alleles in Succinate dehydrogenase d, and to a lesser extent Hypoxia inducible factor 1α, are associated in larvae with variation in metabolic rate and activation of the hypoxia inducible factor (HIF) pathway, which affects tracheal development and delivery of oxygen to adult flight muscles. A dominant Sdhd allele is likely to cause antagonistic pleiotropy for fitness through its opposing effects on larval metabolic and growth rate versus adult flight and dispersal, and may have additional effects arising from sensitivity to low-iron host plants. Prior results in Glanville fritillaries indicate that fitness of alleles in Sdhd and another antagonistically pleiotropic metabolic gene, Phosphoglucose isomerase, depend strongly on the size and distribution of host plant patches. Hence, these intermediate-frequency alleles are involved in ecoevolutionary dynamics involving life history tradeoffs.
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Affiliation(s)
- James H Marden
- Department of Biology, Pennsylvania State University.,Huck Institutes of the Life Sciences, Pennsylvania State University
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121
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Ranganayaki S, Govindaraj P, Gayathri N, Srinivas Bharath MM. Exposure to the neurotoxin 3-nitropropionic acid in neuronal cells induces unique histone acetylation pattern: Implications for neurodegeneration. Neurochem Int 2020; 140:104846. [PMID: 32927024 DOI: 10.1016/j.neuint.2020.104846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 08/21/2020] [Accepted: 09/02/2020] [Indexed: 10/23/2022]
Abstract
Mitochondrial dysfunction is critical for neurodegeneration in movement disorders. Neurotoxicological models recapitulating movement disorder involve mitochondrial damage including inhibition of mitochondrial complexes. Previously, we demonstrated that neurotoxic models of Parkinson's disease and Manganism showed distinct morphological, electrophysiological and molecular profile indicating disease-specific characteristics. In a recent study, we demonstrated that the transcriptomic changes triggered by the neurotoxic mitochondrial complex II inhibitor 3-nitropropionic acid (3-NPA), was significantly different from the profile induced by the neurotoxic mitochondrial complex I inhibitor 1-methyl-4- phenylpyridinium (MPP+) and mitochondrial toxin Manganese (Mn). Among the plausible pathways, we surmised that epigenetic mechanisms could contribute to 3-NPA specific transcriptomic profile. To address this, we assessed global and individual lys-specific acetylation profile of Histone H3 and H4 in the 3-NPA neuronal cell model. Our data revealed histone acetylation profile unique to the 3-NPA model that was not noted in the MPP+ and Mn models. Among the individual lys, Histone H3K56 showed robust dose and time-dependent hyperacetylation in the 3-NPA model. Chromatin Immunoprecipitation-sequencing (ChIP-seq) revealed that acetylated H3K56 was associated with 13072 chromatin sites, which showed increased occupancy in the transcription start site-promoter site. Acetylated histone H3K56 was associated with 1747 up-regulated and 263 down-regulated genes in the 3-NPA model, which included many up-regulated autophagy and mitophagy genes. Western analysis validated the involvement of PINK1-Parkin dependent mitophagy in the 3-NPA model. We propose that 3-NPA specific chromatin dynamics could contribute to the unique transcriptomic profile with implications for movement disorders.
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Affiliation(s)
- S Ranganayaki
- Department of Neurochemistry, NIMHANS, No. 2900, Hosur Road, Bangalore, 560029, Karnataka, India
| | - Periyasamy Govindaraj
- Department of Neuropathology, NIMHANS, No. 2900, Hosur Road, Bangalore, 560029, Karnataka, India
| | - N Gayathri
- Department of Neuropathology, NIMHANS, No. 2900, Hosur Road, Bangalore, 560029, Karnataka, India
| | - M M Srinivas Bharath
- Department of Clinical Psychopharmacology and Neurotoxicology, NIMHANS, No. 2900, Hosur Road, Bangalore, 560029, Karnataka, India.
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122
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Tsotetsi N, Amoako DG, Somboro AM, Khumalo HM, Khan RB. Molecular mechanisms underlying the renoprotective effects of 1,4,7-triazacyclononane: a βeta-lactamase inhibitor. Cytotechnology 2020; 72:785-796. [PMID: 32920746 DOI: 10.1007/s10616-020-00422-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 09/07/2020] [Indexed: 12/11/2022] Open
Abstract
Broad-spectrum β-lactam antibiotics such as penicillin are routinely used against both Gram-negative and Gram-positive bacteria. However, bacteria that produce β-lactamase have developed resistance against these antibiotics by cleaving the β-lactam ring and rendering the antibiotic inactive. To combat this effect, 1,4,7- Triazacyclononane (TACN), a cyclic organic compound derived from cyclononanes has been shown to preserve the activity of β-lactam antibiotics by inhibiting β-lactamase. However, its cytotoxic effects require elucidation. Given that the cytotoxic target for many therapeutics is the kidney, this study investigated the effects of TACN on human embryonic kidney cells (Hek293) cells. Hek293 cells were treated with TACN (0-500 µM) for 24 h and the cytotoxicity was assessed (MTT and LDH assay). Apoptosis was luminometrically detected by measuring phosphatidylserine externalisation and caspase activity and fluorescently detecting necrosis. DNA fragmentation was visualised using fluorescent microscopy. Expression of the apoptosis-related protein were determined by western blot. The results generated indicate that TACN does not initiate necrosis as LDH was decreased. Likewise, decreased apoptosis was supported by the decreased phosphatidylserine, caspases, Bax, cleaved PARP, IAP and NF-kB. However, increased DNA fragmentation was associated with increased p53. Therefore, effects of TACN at the nucleus, produced a p53 response to initiate DNA repair and did not culminate in cell death. The findings show that TACN is not cytotoxic to Hek293 cells via the apoptotic route. Since TACN did not induce cell death, its potential as a metallo-β-lactamase inhibitor (MBLI) may be exploited to counteract the effect of MBL-producing bacteria. Restoring β-lactam activity will curb the global menace of antibiotic resistance.
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Affiliation(s)
- Nrateng Tsotetsi
- Discipline of Medical Biochemistry, School of Laboratory Medicine and Medical Science, University of KwaZulu-Natal, Durban, South Africa
| | - Daniel G Amoako
- Biomedical Resource Unit, School of Laboratory Medicine and Medical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa.
| | - Anou M Somboro
- Biomedical Resource Unit, School of Laboratory Medicine and Medical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Hezekiel M Khumalo
- Discipline of Medical Biochemistry, School of Laboratory Medicine and Medical Science, University of KwaZulu-Natal, Durban, South Africa
| | - Rene B Khan
- Discipline of Medical Biochemistry, School of Laboratory Medicine and Medical Science, University of KwaZulu-Natal, Durban, South Africa.
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123
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Fullerton M, McFarland R, Taylor RW, Alston CL. The genetic basis of isolated mitochondrial complex II deficiency. Mol Genet Metab 2020; 131:53-65. [PMID: 33162331 PMCID: PMC7758838 DOI: 10.1016/j.ymgme.2020.09.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 09/30/2020] [Accepted: 09/30/2020] [Indexed: 11/21/2022]
Abstract
Mitochondrial complex II (succinate:ubiquinone oxidoreductase) is the smallest complex of the oxidative phosphorylation system, a tetramer of just 140 kDa. Despite its diminutive size, it is a key complex in two coupled metabolic pathways - it oxidises succinate to fumarate in the tricarboxylic acid cycle and the electrons are used to reduce FAD to FADH2, ultimately reducing ubiquinone to ubiquinol in the respiratory chain. The biogenesis and assembly of complex II is facilitated by four ancillary proteins, all of which are autosomally-encoded. Numerous pathogenic defects have been reported which describe two broad clinical manifestations, either susceptibility to cancer in the case of single, heterozygous germline variants, or a mitochondrial disease presentation, almost exclusively due to bi-allelic recessive variants and associated with an isolated complex II deficiency. Here we present a compendium of pathogenic gene variants that have been documented in the literature in patients with an isolated mitochondrial complex II deficiency. To date, 61 patients are described, harbouring 32 different pathogenic variants in four distinct complex II genes: three structural subunit genes (SDHA, SDHB and SDHD) and one assembly factor gene (SDHAF1). Many pathogenic variants result in a null allele due to nonsense, frameshift or splicing defects however, the missense variants that do occur tend to induce substitutions at highly conserved residues in regions of the proteins that are critical for binding to other subunits or substrates. There is phenotypic heterogeneity associated with defects in each complex II gene, similar to other mitochondrial diseases.
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Affiliation(s)
- Millie Fullerton
- Wellcome Centre for Mitochondrial Research, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK
| | - Robert McFarland
- Wellcome Centre for Mitochondrial Research, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK; Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK; NHS Highly Specialised Services for Rare Mitochondrial Disorders, Royal Victoria Infirmary, Newcastle upon Tyne Hospitals NHS Foundation Trust, Queen Victoria Road, Newcastle upon Tyne, NE1 4LP, UK
| | - Robert W Taylor
- Wellcome Centre for Mitochondrial Research, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK; Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK; NHS Highly Specialised Services for Rare Mitochondrial Disorders, Royal Victoria Infirmary, Newcastle upon Tyne Hospitals NHS Foundation Trust, Queen Victoria Road, Newcastle upon Tyne, NE1 4LP, UK
| | - Charlotte L Alston
- Wellcome Centre for Mitochondrial Research, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK; Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK; NHS Highly Specialised Services for Rare Mitochondrial Disorders, Royal Victoria Infirmary, Newcastle upon Tyne Hospitals NHS Foundation Trust, Queen Victoria Road, Newcastle upon Tyne, NE1 4LP, UK.
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Lehti M, Valkeinen H, Sipilä S, Perhonen M, Rottensteiner M, Pullinen T, Pietiläinen R, Nyman K, Vehkaoja A, Kainulainen H, Kujala UM. Effects of aerobic and strength training on aerobic capacity, muscle strength, and gene expression of lymphomonocytes in patients with stable CAD. Am J Transl Res 2020; 12:4582-4593. [PMID: 32913532 PMCID: PMC7476147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 06/19/2020] [Indexed: 06/11/2023]
Abstract
This study examined the effectiveness, suitability, and safety of a mixed interval-type aerobic and strength training program (MIAST) on physical fitness in patients with stable coronary artery disease (CAD) without history of myocardial infarction (MI). Twenty-three patients with stable CAD were randomly assigned to a MIAST (n = 12; mean age 58.6 years) or control (n = 11; 63.3 years) group. The MIAST group participated in the progressive training program twice a week for 21 weeks. Peak oxygen uptake (VO2peak), workload, and exercise time were measured as were maximal muscle strength, serum lipids, glucose concentration, and the cross-sectional area (CSA) of knee extensors. The safety and suitability of the program were assessed by wireless electrocardiogram (ECG) monitoring and exercise diaries. VO2peak (6.9%; P < 0.05) and exercise time (11.2%; P < 0.05) improved significantly after 12 weeks of training in the MIAST group compared to the control group. Muscle strength (19.9%; P < 0.05) and CSA (2.2%; P < 0.05) increased, and serum lipids and blood glucose tended to decrease after the training. The successful training program (increase in maximal oxygen uptake) increased the gene expression of oxygen metabolism and decreased the gene expression of inflammation pathways in lymphomonocytes. The MIAST program, including interval-type aerobic and strength training, was safe, did not cause any adverse effects, and led to significant improvements in physical fitness in patients with stable CAD.
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Affiliation(s)
- Maarit Lehti
- Faculty of Sport and Health Science, University of JyväskyläJyväskylä, Finland
- LIKES Research Centre for Physical Activity and HealthJyväskylä, Finland
| | - Heli Valkeinen
- Finnish Institute for Health and WelfareHelsinki, Finland
| | - Sarianna Sipilä
- Gerontology Research Center, Faculty of Sport and Health Sciences, University of JyväskyläJyväskylä, Finland
| | | | - Mirva Rottensteiner
- Faculty of Sport and Health Science, University of JyväskyläJyväskylä, Finland
- Department of Medicine, Central Finland Health Care DistrictJyväskylä, Finland
| | - Teemu Pullinen
- Neuromuscular Research Center, Faculty of Sport and Health Sciences, University of JyväskyläJyväskylä, Finland
| | | | - Kai Nyman
- Central Hospital of Central FinlandJyväskylä, Finland
| | - Antti Vehkaoja
- Faculty of Medicine and Health Technology, Tampere UniversityTampere, Finland
| | - Heikki Kainulainen
- Neuromuscular Research Center, Faculty of Sport and Health Sciences, University of JyväskyläJyväskylä, Finland
| | - Urho M Kujala
- Faculty of Sport and Health Science, University of JyväskyläJyväskylä, Finland
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125
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Markevich NI, Galimova MH, Markevich LN. Hysteresis and bistability in the succinate-CoQ reductase activity and reactive oxygen species production in the mitochondrial respiratory complex II. Redox Biol 2020; 37:101630. [PMID: 32747163 PMCID: PMC7767736 DOI: 10.1016/j.redox.2020.101630] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/14/2020] [Accepted: 06/28/2020] [Indexed: 11/25/2022] Open
Abstract
The mitochondrial respiratory Complex II (CII) is one of key enzymes of cell energy metabolism, linking the tricarboxylic acid (TCA) cycle and the electron transport chain (ETC). CII reversibly oxidizes succinate to fumarate in the TCA cycle and transfers the electrons, produced by this reaction to the membrane quinone pool, providing ubiquinol QH2 to ETC. CII is also known as a generator of reactive oxygen species (ROS). It was shown experimentally that succinate can serve as not only a substrate in the forward succinate-quinone oxidoreductase (SQR) direction, but also an enzyme activator. Molecular and kinetic mechanisms of this property of CII are still unclear. In order to account for activation of CII by succinate in the forward SQR direction, we developed and analyzed a computational mechanistic model of electron transfer and ROS formation in CII. It was found that re-binding of succinate to the unoccupied dicarboxylate binding site when FAD is reduced with subsequent oxidation of FADH2 creates a positive feedback loop in the succinate oxidation. The model predicts that this positive feedback can result in hysteresis and bistable switches in SQR activity and ROS production in CII. This requires that the rate constant of re-binding of succinate has to be higher than the rate constant of the initial succinate binding to the active center when FAD is oxidized. Hysteresis and bistability in the SQR activity and ROS production in CII can play an important physiological role. In the presence of hysteresis with two stable branches with high and low SQR activity, high SQR activity is maintained even with a very strong drop in the succinate concentration, which may be necessary in the process of cell functioning in stressful situations. For the same reason, a high stationary rate of ROS production in CII can be maintained at low succinate concentrations. Computational model of electron flows in the respiratory Complex II was developed. The Complex II model predicts a positive feedback loop in the succinate oxidation. Complex II can operate as a bistable switch between two alternative stable states. ROS production in Complex II may have a hysteretic behaviour.
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Affiliation(s)
- Nikolay I Markevich
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow region, 142290, Russian Federation.
| | - Miliausha H Galimova
- Institute of Theoretical and Experimental Biophysics RAS, Pushchino, Moscow region, 142290, Russian Federation
| | - Lubov N Markevich
- Institute of Cell Biophysics of RAS, Pushchino, Moscow region, 142290, Russian Federation
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126
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Luo Y, Ma J, Lu W. The Significance of Mitochondrial Dysfunction in Cancer. Int J Mol Sci 2020; 21:ijms21165598. [PMID: 32764295 PMCID: PMC7460667 DOI: 10.3390/ijms21165598] [Citation(s) in RCA: 133] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 07/30/2020] [Accepted: 07/31/2020] [Indexed: 02/06/2023] Open
Abstract
As an essential organelle in nucleated eukaryotic cells, mitochondria play a central role in energy metabolism, maintenance of redox balance, and regulation of apoptosis. Mitochondrial dysfunction, either due to the TCA cycle enzyme defects, mitochondrial DNA genetic mutations, defective mitochondrial electron transport chain, oxidative stress, or aberrant oncogene and tumor suppressor signaling, has been observed in a wide spectrum of human cancers. In this review, we summarize mitochondrial dysfunction induced by these alterations that promote human cancers.
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Affiliation(s)
- Yongde Luo
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou 325000, China
- Division of Gastroenterology and Hepatology, Department of Medicine, Stony Brook University, Stony Brook, NY 11794, USA;
- Correspondence: (Y.L.); (W.L.)
| | - Jianjia Ma
- Division of Gastroenterology and Hepatology, Department of Medicine, Stony Brook University, Stony Brook, NY 11794, USA;
| | - Weiqin Lu
- Division of Gastroenterology and Hepatology, Department of Medicine, Stony Brook University, Stony Brook, NY 11794, USA;
- Correspondence: (Y.L.); (W.L.)
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127
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IsoSearch: An Untargeted and Unbiased Metabolite and Lipid Isotopomer Tracing Strategy from HR-LC-MS/MS Datasets. Methods Protoc 2020; 3:mps3030054. [PMID: 32751454 PMCID: PMC7563207 DOI: 10.3390/mps3030054] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 07/27/2020] [Accepted: 07/28/2020] [Indexed: 12/13/2022] Open
Abstract
Stable isotopic tracer analysis is a technique used to determine carbon or nitrogen atom incorporation into biological systems. A number of mass spectrometry based approaches have been developed for this purpose, including high-resolution tandem mass spectrometry (HR-LC-MS/MS), selected reaction monitoring (SRM) and parallel reaction monitoring (PRM). We have developed an approach for analyzing untargeted metabolomic and lipidomic datasets using high-resolution mass spectrometry with polarity switching and implemented our approach in the open-source R script IsoSearch and in Scaffold Elements software. Using our strategy, which requires an unlabeled reference dataset and isotope labeled datasets across various biological conditions, we traced metabolic isotopomer alterations in breast cancer cells (MCF-7) treated with the metabolic drugs 2-deoxy-glucose, 6-aminonicotinamide, compound 968, and rapamycin. Metabolites and lipids were first identified by the commercial software Scaffold Elements and LipidSearch, then IsoSearch successfully profiled the 13C-isotopomers extracted metabolites and lipids from 13C-glucose labeled MCF-7 cells. The results interpreted known models, such as glycolysis and pentose phosphate pathway inhibition, but also helped to discover new metabolic/lipid flux patterns, including a reactive oxygen species (ROS) defense mechanism induced by 6AN and triglyceride accumulation in rapamycin treated cells. The results suggest the IsoSearch/Scaffold Elements platform is effective for studying metabolic tracer analysis in diseases, drug metabolism, and metabolic engineering for both polar metabolites and non-polar lipids.
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128
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Pérez A, Rivoira MA, Rodríguez V, Marchionatti A, Tolosa de Talamoni N. Role of mitochondria in the differential action of sodium deoxycholate and ursodeoxycholic acid on rat duodenum. Can J Physiol Pharmacol 2020; 99:270-277. [PMID: 32687730 DOI: 10.1139/cjpp-2019-0561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sodium deoxycholate (NaDOC) inhibits the intestinal Ca2+ absorption and ursodeoxycholic acid (UDCA) stimulates it. The aim of this study was to determine whether NaDOC and UDCA produce differential effects on the redox state of duodenal mitochondria altering the Krebs cycle and the electron transport chain (ETC) functioning, which could lead to perturbations in the mitochondrial dynamics and biogenesis. Rat intestinal mitochondria were isolated from untreated and treated animals with either NaDOC, UDCA, or both. Krebs cycle enzymes, ETC components, ATP synthase, and mitochondrial dynamics and biogenesis markers were determined. NaDOC decreased isocitrate dehydrogenase (ICDH) and malate dehydrogenase activities affecting the ETC and ATP synthesis. NaDOC also induced oxidative stress and increased the superoxide dismutase activity and impaired the mitochondrial biogenesis and functionality. UDCA increased the activities of ICDH and complex II of ETC. The combination of both bile acids conserved the functional activities of Krebs cycle enzymes, ETC components, oxidative phosphorylation, and mitochondrial biogenesis. In conclusion, the inhibitory effect of NaDOC on intestinal Ca2+ absorption is mediated by mitochondrial dysfunction, which is avoided by UDCA. The stimulatory effect of UDCA alone is associated with amelioration of mitochondrial functioning. This knowledge could improve treatment of diseases that affect the intestinal Ca2+ absorption.
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Affiliation(s)
- Adriana Pérez
- Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina.,Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina
| | - María Angélica Rivoira
- Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina.,Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina
| | - Valeria Rodríguez
- Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina.,Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina
| | - Ana Marchionatti
- Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina.,Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina
| | - Nori Tolosa de Talamoni
- Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina.,Laboratorio "Dr. Fernando Cañas", Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, INICSA (CONICET-Universidad Nacional de Córdoba), Pabellón Argentina, 2do. Piso, Ciudad Universitaria, 5000 Córdoba, Argentina
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129
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Pierce JD, Shen Q, Vacek J, Rahman FK, Krueger KJ, Gupta B, Hiebert JB. Potential use of ubiquinol and d-ribose in patients with heart failure with preserved ejection fraction. Ann Med Surg (Lond) 2020; 55:77-80. [PMID: 32477499 PMCID: PMC7251495 DOI: 10.1016/j.amsu.2020.05.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 05/04/2020] [Accepted: 05/07/2020] [Indexed: 11/27/2022] Open
Abstract
•Manuscript Highlights.•HFpEF is associated with reduced ATP production in the myocardium.•Ubiquinol and d-ribose both contribute to the generation of myocardial ATP.•Both ubiquinol and d-ribose are being studied as supplemental treatments for patients with HFpEF.
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Affiliation(s)
- Janet D. Pierce
- School of Nursing, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS, 66160, USA
| | - Qiuhua Shen
- School of Nursing, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS, 66160, USA
| | - James Vacek
- The University of Kansas Health System, 4000 Cambridge St, Kansas City, KS, 66160, USA
| | - Faith K. Rahman
- School of Nursing, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS, 66160, USA
| | - Kathryn J. Krueger
- School of Nursing, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS, 66160, USA
| | - Bhanu Gupta
- The University of Kansas Health System, 4000 Cambridge St, Kansas City, KS, 66160, USA
| | - John B. Hiebert
- School of Nursing, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS, 66160, USA
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130
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Ghosh P, Vidal C, Dey S, Zhang L. Mitochondria Targeting as an Effective Strategy for Cancer Therapy. Int J Mol Sci 2020; 21:E3363. [PMID: 32397535 PMCID: PMC7247703 DOI: 10.3390/ijms21093363] [Citation(s) in RCA: 118] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 04/30/2020] [Accepted: 05/06/2020] [Indexed: 12/14/2022] Open
Abstract
Mitochondria are well known for their role in ATP production and biosynthesis of macromolecules. Importantly, increasing experimental evidence points to the roles of mitochondrial bioenergetics, dynamics, and signaling in tumorigenesis. Recent studies have shown that many types of cancer cells, including metastatic tumor cells, therapy-resistant tumor cells, and cancer stem cells, are reliant on mitochondrial respiration, and upregulate oxidative phosphorylation (OXPHOS) activity to fuel tumorigenesis. Mitochondrial metabolism is crucial for tumor proliferation, tumor survival, and metastasis. Mitochondrial OXPHOS dependency of cancer has been shown to underlie the development of resistance to chemotherapy and radiotherapy. Furthermore, recent studies have demonstrated that elevated heme synthesis and uptake leads to intensified mitochondrial respiration and ATP generation, thereby promoting tumorigenic functions in non-small cell lung cancer (NSCLC) cells. Also, lowering heme uptake/synthesis inhibits mitochondrial OXPHOS and effectively reduces oxygen consumption, thereby inhibiting cancer cell proliferation, migration, and tumor growth in NSCLC. Besides metabolic changes, mitochondrial dynamics such as fission and fusion are also altered in cancer cells. These alterations render mitochondria a vulnerable target for cancer therapy. This review summarizes recent advances in the understanding of mitochondrial alterations in cancer cells that contribute to tumorigenesis and the development of drug resistance. It highlights novel approaches involving mitochondria targeting in cancer therapy.
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Affiliation(s)
| | | | | | - Li Zhang
- Department of Biological Sciences, The University of Texas at Dallas, Richardson, TX 75080, USA; (P.G.); (C.V.); (S.D.)
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131
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Wu M, Gu J, Zong S, Guo R, Liu T, Yang M. Research journey of respirasome. Protein Cell 2020; 11:318-338. [PMID: 31919741 PMCID: PMC7196574 DOI: 10.1007/s13238-019-00681-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 12/11/2019] [Indexed: 12/11/2022] Open
Abstract
Respirasome, as a vital part of the oxidative phosphorylation system, undertakes the task of transferring electrons from the electron donors to oxygen and produces a proton concentration gradient across the inner mitochondrial membrane through the coupled translocation of protons. Copious research has been carried out on this lynchpin of respiration. From the discovery of individual respiratory complexes to the report of the high-resolution structure of mammalian respiratory supercomplex I1III2IV1, scientists have gradually uncovered the mysterious veil of the electron transport chain (ETC). With the discovery of the mammalian respiratory mega complex I2III2IV2, a new perspective emerges in the research field of the ETC. Behind these advances glitters the light of the revolution in both theory and technology. Here, we give a short review about how scientists 'see' the structure and the mechanism of respirasome from the macroscopic scale to the atomic scale during the past decades.
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Affiliation(s)
- Meng Wu
- Ministry of Education Key Laboratory of Protein Science, Tsinghua-Peking Joint Center for Life Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Jinke Gu
- Ministry of Education Key Laboratory of Protein Science, Tsinghua-Peking Joint Center for Life Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Shuai Zong
- Ministry of Education Key Laboratory of Protein Science, Tsinghua-Peking Joint Center for Life Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Runyu Guo
- Ministry of Education Key Laboratory of Protein Science, Tsinghua-Peking Joint Center for Life Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Tianya Liu
- Ministry of Education Key Laboratory of Protein Science, Tsinghua-Peking Joint Center for Life Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Maojun Yang
- Ministry of Education Key Laboratory of Protein Science, Tsinghua-Peking Joint Center for Life Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
- School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
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132
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Impairment of mitochondrial function by particulate matter: Implications for the brain. Neurochem Int 2020; 135:104694. [DOI: 10.1016/j.neuint.2020.104694] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 02/03/2020] [Accepted: 02/04/2020] [Indexed: 12/18/2022]
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133
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Stotland AB, Spivia W, Orosco A, Andres AM, Gottlieb RA, Van Eyk JE, Parker SJ. MitoPlex: A targeted multiple reaction monitoring assay for quantification of a curated set of mitochondrial proteins. J Mol Cell Cardiol 2020; 142:1-13. [PMID: 32234390 PMCID: PMC7347090 DOI: 10.1016/j.yjmcc.2020.03.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 03/23/2020] [Accepted: 03/24/2020] [Indexed: 12/21/2022]
Abstract
Mitochondria are the major source of cellular energy (ATP), as well as critical mediators of widespread functions such as cellular redox balance, apoptosis, and metabolic flux. The organelles play an especially important role in the maintenance of cardiac homeostasis; their inability to generate ATP following impairment due to ischemic damage has been directly linked to organ failure. Methods to quantify mitochondrial content are limited to low throughput immunoassays, measurement of mitochondrial DNA, or relative quantification by untargeted mass spectrometry. Here, we present a high throughput, reproducible and quantitative mass spectrometry multiple reaction monitoring based assay of 37 proteins critical to central carbon chain metabolism and overall mitochondrial function termed 'MitoPlex'. We coupled this protein multiplex with a parallel analysis of the central carbon chain metabolites (219 metabolite assay) extracted in tandem from the same sample, be it cells or tissue. In tests of its biological applicability in cells and tissues, "MitoPlex plus metabolites" indicated profound effects of HMG-CoA Reductase inhibition (e.g., statin treatment) on mitochondria of i) differentiating C2C12 skeletal myoblasts, as well as a clear opposite trend of statins to promote mitochondrial protein expression and metabolism in heart and liver, while suppressing mitochondrial protein and ii) aspects of metabolism in the skeletal muscle obtained from C57Bl6 mice. Our results not only reveal new insights into the metabolic effect of statins in skeletal muscle, but present a new high throughput, reliable MS-based tool to study mitochondrial dynamics in both cell culture and in vivo models.
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Affiliation(s)
- Aleksandr B Stotland
- Molecular Cardiobiology, Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America
| | - Weston Spivia
- Advanced Clinical Biosystems Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America
| | - Amanda Orosco
- Advanced Clinical Biosystems Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America
| | - Allen M Andres
- Molecular Cardiobiology, Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America
| | - Roberta A Gottlieb
- Molecular Cardiobiology, Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America
| | - Jennifer E Van Eyk
- Advanced Clinical Biosystems Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America
| | - Sarah J Parker
- Advanced Clinical Biosystems Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America.
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134
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Tankyrase inhibition ameliorates lipid disorder via suppression of PGC-1α PARylation in db/db mice. Int J Obes (Lond) 2020; 44:1691-1702. [PMID: 32317752 PMCID: PMC7381423 DOI: 10.1038/s41366-020-0573-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 03/06/2020] [Accepted: 03/27/2020] [Indexed: 12/12/2022]
Abstract
Objective Human TNKS, encoding tankyrase 1 (TNKS1), localizes to a susceptibility locus for obesity and type 2 diabetes mellitus (T2DM). Here, we addressed the therapeutic potential of G007-LK, a TNKS-specific inhibitor, for obesity and T2DM. Methods We administered G007-LK to diabetic db/db mice and measured the impact on body weight, abdominal adiposity, and serum metabolites. Muscle, liver, and white adipose tissues were analyzed by quantitative RT-PCR and western blotting to determine TNKS inhibition, lipolysis, beiging, adiponectin level, mitochondrial oxidative metabolism and mass, and gluconeogenesis. Protein interaction and PARylation analyses were carried out by immunoprecipitation, pull-down and in situ proximity ligation assays. Results TNKS inhibition reduced body weight gain, abdominal fat content, serum cholesterol levels, steatosis, and proteins associated with lipolysis in diabetic db/db mice. We discovered that TNKS associates with PGC-1α and that TNKS inhibition attenuates PARylation of PGC-1α, contributing to increased PGC-1α level in WAT and muscle in db/db mice. PGC-1α upregulation apparently modulated transcriptional reprogramming to increase mitochondrial mass and fatty acid oxidative metabolism in muscle, beiging of WAT, and raised circulating adiponectin level in db/db mice. This was in sharp contrast to the liver, where TNKS inhibition in db/db mice had no effect on PGC-1α expression, lipid metabolism, or gluconeogenesis. Conclusion Our study unravels a novel molecular mechanism whereby pharmacological inhibition of TNKS in obesity and diabetes enhances oxidative metabolism and ameliorates lipid disorder. This happens via tissue-specific PGC-1α-driven transcriptional reprogramming in muscle and WAT, without affecting liver. This highlights inhibition of TNKS as a potential pharmacotherapy for obesity and T2DM.
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135
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Liu Y, Pang Y, Zhu B, Uher O, Caisova V, Huynh TT, Taieb D, Hadrava Vanova K, Ghayee HK, Neuzil J, Levine M, Yang C, Pacak K. Therapeutic Targeting of SDHB-Mutated Pheochromocytoma/Paraganglioma with Pharmacologic Ascorbic Acid. Clin Cancer Res 2020; 26:3868-3880. [PMID: 32152203 DOI: 10.1158/1078-0432.ccr-19-2335] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 12/09/2019] [Accepted: 03/04/2020] [Indexed: 12/21/2022]
Abstract
PURPOSE Pheochromocytomas and paragangliomas (PCPG) are usually benign neuroendocrine tumors. However, PCPGs with mutations in the succinate dehydrogenase B subunit (SDHB) have a poor prognosis and frequently develop metastatic lesions. SDHB-mutated PCPGs exhibit dysregulation in oxygen metabolic pathways, including pseudohypoxia and formation of reactive oxygen species, suggesting that targeting the redox balance pathway could be a potential therapeutic approach. EXPERIMENTAL DESIGN We studied the genetic alterations of cluster I PCPGs compared with cluster II PCPGs, which usually present as benign tumors. By targeting the signature molecular pathway, we investigated the therapeutic effect of ascorbic acid on PCPGs using in vitro and in vivo models. RESULTS By investigating PCPG cells with low SDHB levels, we show that pseudohypoxia resulted in elevated expression of iron transport proteins, including transferrin (TF), transferrin receptor 2 (TFR2), and the divalent metal transporter 1 (SLC11A2; DMT1), leading to iron accumulation. This iron overload contributed to elevated oxidative stress. Ascorbic acid at pharmacologic concentrations disrupted redox homeostasis, inducing DNA oxidative damage and cell apoptosis in PCPG cells with low SDHB levels. Moreover, through a preclinical animal model with PCPG allografts, we demonstrated that pharmacologic ascorbic acid suppressed SDHB-low metastatic lesions and prolonged overall survival. CONCLUSIONS The data here demonstrate that targeting redox homeostasis as a cancer vulnerability with pharmacologic ascorbic acid is a promising therapeutic strategy for SDHB-mutated PCPGs.
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Affiliation(s)
- Yang Liu
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland
| | - Ying Pang
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland
| | - Boqun Zhu
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland.,Endoscopy Center and Endoscopy Research Institute, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Ondrej Uher
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland.,Department of Medical Biology, Faculty of Science, University of South Bohemia, Ceske Budejovice, Czech Republic
| | - Veronika Caisova
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland
| | - Thanh-Truc Huynh
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland
| | - David Taieb
- Department of Nuclear Medicine, La Timone University Hospital, CERIMED, Aix-Marseille University, Marseille, France
| | - Katerina Hadrava Vanova
- Molecular Therapy Group, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, Czech Republic
| | - Hans Kumar Ghayee
- Department of Internal Medicine, Division of Endocrinology, University of Florida College of Medicine and Malcom Randall VA Medical Center, Gainesville, Florida
| | - Jiri Neuzil
- Department of Medical Biology, Faculty of Science, University of South Bohemia, Ceske Budejovice, Czech Republic.,Mitochondria, Apoptosis and Cancer Research Group, School of Medical Science and Menzies Health Institute Queensland, Griffith University, Southport, Queensland, Australia
| | - Mark Levine
- Molecular and Clinical Nutrition Section, Intramural Research Program, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland
| | - Chunzhang Yang
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland.
| | - Karel Pacak
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, Maryland.
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136
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Moosavi B, Zhu XL, Yang WC, Yang GF. Genetic, epigenetic and biochemical regulation of succinate dehydrogenase function. Biol Chem 2020; 401:319-330. [DOI: 10.1515/hsz-2019-0264] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Accepted: 08/08/2019] [Indexed: 12/22/2022]
Abstract
AbstractSuccinate dehydrogenase (SDH), complex II or succinate:quinone oxidoreductase (SQR) is a crucial enzyme involved in both the tricarboxylic acid (TCA) cycle and oxidative phosphorylation (OXPHOS), the two primary metabolic pathways for generating ATP. Impaired function of SDH results in deleterious disorders from cancer to neurodegeneration. SDH function is tailored to meet the energy demands in different cell types. Thus, understanding how SDH function is regulated and how it operates in distinct cell types can support the development of therapeutic approaches against the diseases. In this article we discuss the molecular pathways which regulate SDH function and describe extra roles played by SDH in specific cell types.
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Affiliation(s)
- Behrooz Moosavi
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P.R. China
| | - Xiao-lei Zhu
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P.R. China
| | - Wen-Chao Yang
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P.R. China
| | - Guang-Fu Yang
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P.R. China
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137
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Staňková P, Kučera O, Peterová E, Lotková H, Maseko TE, Nožičková K, Červinková Z. Adaptation of Mitochondrial Substrate Flux in a Mouse Model of Nonalcoholic Fatty Liver Disease. Int J Mol Sci 2020; 21:ijms21031101. [PMID: 32046101 PMCID: PMC7036817 DOI: 10.3390/ijms21031101] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/02/2020] [Accepted: 02/05/2020] [Indexed: 12/30/2022] Open
Abstract
Maladaptation of mitochondrial oxidative flux seems to be a considerable feature of nonalcoholic fatty liver disease (NAFLD). The aim of this work was to induce NAFLD in mice fed a Western-style diet (WD) and to evaluate liver mitochondrial functions. Experiments were performed on male C57BL/6J mice fed with a control diet or a WD for 24 weeks. Histological changes in liver and adipose tissue as well as hepatic expression of fibrotic and inflammatory genes and proteins were evaluated. The mitochondrial respiration was assessed by high-resolution respirometry. Oxidative stress was evaluated by measuring lipoperoxidation, glutathione, and reactive oxygen species level. Feeding mice a WD induced adipose tissue inflammation and massive liver steatosis accompanied by mild inflammation and fibrosis. We found decreased succinate-activated mitochondrial respiration and decreased succinate dehydrogenase (SDH) activity in the mice fed a WD. The oxidative flux with other substrates was not affected. We observed increased ketogenic capacity, but no impact on the capacity for fatty acid oxidation. We did not confirm the presence of oxidative stress. Mitochondria in this stage of the disease are adapted to increased substrate flux. However, inhibition of SDH can lead to the accumulation of succinate, an important signaling molecule associated with inflammation, fibrosis, and carcinogenesis.
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Affiliation(s)
- Pavla Staňková
- Department of Physiology, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (P.S.); (H.L.); (T.E.M.); (K.N.); (Z.Č.)
| | - Otto Kučera
- Department of Physiology, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (P.S.); (H.L.); (T.E.M.); (K.N.); (Z.Č.)
- Correspondence: ; Tel.: +420-495-816-186
| | - Eva Peterová
- Department of Medical Biochemistry, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic;
| | - Halka Lotková
- Department of Physiology, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (P.S.); (H.L.); (T.E.M.); (K.N.); (Z.Č.)
| | - Tumisang Edward Maseko
- Department of Physiology, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (P.S.); (H.L.); (T.E.M.); (K.N.); (Z.Č.)
| | - Kateřina Nožičková
- Department of Physiology, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (P.S.); (H.L.); (T.E.M.); (K.N.); (Z.Č.)
| | - Zuzana Červinková
- Department of Physiology, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (P.S.); (H.L.); (T.E.M.); (K.N.); (Z.Č.)
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138
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Moosavi B, Zhu XL, Yang WC, Yang GF. Molecular pathogenesis of tumorigenesis caused by succinate dehydrogenase defect. Eur J Cell Biol 2020; 99:151057. [DOI: 10.1016/j.ejcb.2019.151057] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 09/19/2019] [Accepted: 10/29/2019] [Indexed: 12/14/2022] Open
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139
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Li K, Han W, Zhao Y, Qi Y, Li Y, Bi J, Wang Y, Dong G. Using complex II as an emerging therapeutic target for the treatment of muscle lesions. Saudi J Biol Sci 2020; 26:1943-1947. [PMID: 31889777 PMCID: PMC6923501 DOI: 10.1016/j.sjbs.2019.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 06/26/2019] [Accepted: 07/05/2019] [Indexed: 11/18/2022] Open
Abstract
After patients has been trapped into skeletal muscle injury, hypoxic and dysfunctional mitochondria brings about a crisis in energy supply that severely disrupts the repair of skeletal muscle. This study aims to elucidate injury-induced adaptations in the mitochondria and provide statistics for the role of complex II in instilling cells with energy under hypoxic conditions. Fifty-six male Wistar rats were divided into control, 12 h, 2 d, 5 d, 7 d, 10 d, 15 d, and 30 d postinjury groups. Contusion injury was made via an instrumented drop-mass technique delivering single impact to the posterior surface of the gastrocnemius of one limb of the rats. ROS levels, loss of mitochondrial membrane potential (MMP), activities of marker enzymes (miCK, LDH, and ALP), and activities of complexes I–III were determined. Our findings reveal that the first 2 d postinjury, especially at 12 h, is the period with most severe oxidative stress. After injury, the activities of mitochondrial complexes I–III display different behaviors based on time and various energy production mechanisms. Our results highlight that complex II participates in electron transport in the acute phase of blunt trauma. We proposed that CII could be a therapeutic target in muscle lesions.
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Affiliation(s)
- Kefeng Li
- College of Sports and Health, Shandong Sport University, Jinan 250102, China
| | - Wei Han
- College of Sports and Health, Shandong Sport University, Jinan 250102, China
| | - Ying Zhao
- College of Sports and Health, Shandong Sport University, Jinan 250102, China
| | - Yujuan Qi
- College of Sports and Health, Shandong Sport University, Jinan 250102, China
| | - Yadan Li
- College of Sports and Health, Shandong Sport University, Jinan 250102, China
| | - Jun Bi
- College of Sports and Health, Shandong Sport University, Jinan 250102, China
| | - Yi Wang
- College of Sports and Health, Shandong Sport University, Jinan 250102, China
| | - Guijun Dong
- College of Sports and Health, Shandong Sport University, Jinan 250102, China
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140
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Modeling succinate dehydrogenase loss disorders in C. elegans through effects on hypoxia-inducible factor. PLoS One 2019; 14:e0227033. [PMID: 31887185 PMCID: PMC6936837 DOI: 10.1371/journal.pone.0227033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 12/10/2019] [Indexed: 12/03/2022] Open
Abstract
Mitochondrial disorders arise from defects in nuclear genes encoding enzymes of oxidative metabolism. Mutations of metabolic enzymes in somatic tissues can cause cancers due to oncometabolite accumulation. Paraganglioma and pheochromocytoma are examples, whose etiology and therapy are complicated by the absence of representative cell lines or animal models. These tumors can be driven by loss of the tricarboxylic acid cycle enzyme succinate dehydrogenase. We exploit the relationship between succinate accumulation, hypoxic signaling, egg-laying behavior, and morphology in C. elegans to create genetic and pharmacological models of succinate dehydrogenase loss disorders. With optimization, these models may enable future high-throughput screening efforts.
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141
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Maekawa S, Takada S, Furihata T, Fukushima A, Yokota T, Kinugawa S. Mitochondrial respiration of complex II is not lower than that of complex I in mouse skeletal muscle. Biochem Biophys Rep 2019; 21:100717. [PMID: 31890905 PMCID: PMC6928343 DOI: 10.1016/j.bbrep.2019.100717] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 11/21/2019] [Accepted: 12/06/2019] [Indexed: 02/07/2023] Open
Abstract
Skeletal muscle (SKM) requires a large amount of energy, which is produced mainly by mitochondria, for their daily functioning. Of the several mitochondrial complexes, it has been reported that the dysfunction of complex II is associated with several diseases, including myopathy. However, the degree to which complex II contributes to ATP production by mitochondria remains unknown. As complex II is not included in supercomplexes, which are formed to produce ATP efficiently, we hypothesized that complex II-linked respiration was lower than that of complex I. In addition, differences in the characteristics of complex I and II activity suggest that different factors might regulate their function. The isolated mitochondria from gastrocnemius muscle was used for mitochondrial respiration measurement and immunoblotting in male C57BL/6J mice. Student paired t-tests were performed to compare means between two groups. A univariate linear regression model was used to determine the correlation between mitochondrial respiration and proteins. Contrary to our hypothesis, complex II-linked respiration was not significantly less than complex I-linked respiration in SKM mitochondria (complex I vs complex II, 3402 vs 2840 pmol/[s × mg]). Complex I-linked respiration correlated with the amount of complex I incorporated in supercomplexes (r = 0.727, p < 0.05), but not with the total amount of complex I subunits. In contrast, complex II-linked respiration correlated with the total amount of complex II (r = 0.883, p < 0.05), but not with the amount of each complex II subunit. We conclude that both complex I and II play important roles in mitochondrial respiration and that the assembly of both supercomplexes and complex II is essential for the normal functioning of complex I and II in mouse SKM mitochondria. Complex II-linked respiration was comparable to complex I-linked respiration in isolated skeletal muscle mitochondria. Complex I-linked respiration correlated with the amount of complex I incorporated in supercomplexes, but not with the complex I subunit. Complex II-linked respiration correlated with the amount of complex II, but not with the SDH subunit.
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Affiliation(s)
- Satoshi Maekawa
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Shingo Takada
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan.,Faculty of Lifelong Sport, Department of Sports Education, Hokusho University, Ebetsu, Japan
| | - Takaaki Furihata
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Arata Fukushima
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Takashi Yokota
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Shintaro Kinugawa
- Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan
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142
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Raimondi V, Ciccarese F, Ciminale V. Oncogenic pathways and the electron transport chain: a dangeROS liaison. Br J Cancer 2019; 122:168-181. [PMID: 31819197 PMCID: PMC7052168 DOI: 10.1038/s41416-019-0651-y] [Citation(s) in RCA: 96] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 10/30/2019] [Accepted: 11/05/2019] [Indexed: 02/07/2023] Open
Abstract
Driver mutations in oncogenic pathways, rewiring of cellular metabolism and altered ROS homoeostasis are intimately connected hallmarks of cancer. Electrons derived from different metabolic processes are channelled into the mitochondrial electron transport chain (ETC) to fuel the oxidative phosphorylation process. Electrons leaking from the ETC can prematurely react with oxygen, resulting in the generation of reactive oxygen species (ROS). Several signalling pathways are affected by ROS, which act as second messengers controlling cell proliferation and survival. On the other hand, oncogenic pathways hijack the ETC, enhancing its ROS-producing capacity by increasing electron flow or by impinging on the structure and organisation of the ETC. In this review, we focus on the ETC as a source of ROS and its modulation by oncogenic pathways, which generates a vicious cycle that resets ROS levels to a higher homoeostatic set point, sustaining the cancer cell phenotype.
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Affiliation(s)
| | | | - Vincenzo Ciminale
- Veneto Institute of Oncology IOV - IRCCS, Padua, Italy. .,Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua, Italy.
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143
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Su W, Shi J, Zhao Y, Yan F, Lei L, Li H. Porphyromonas gingivalis triggers inflammatory responses in periodontal ligament cells by succinate-succinate dehydrogenase-HIF-1α axis. Biochem Biophys Res Commun 2019; 522:184-190. [PMID: 31757417 DOI: 10.1016/j.bbrc.2019.11.074] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 11/12/2019] [Indexed: 02/08/2023]
Abstract
Metabolic reprogramming from oxidative phosphorylation to glycolysis have been implicated in the pathogenesis of inflammatory diseases, such as pulmonary hypertension, rheumatoid arthritis and sepsis. Whether metabolic reprogramming participates in the progression of bacteriogenic periodontitis has never been reported. In the present study, we explored metabolic changes in periodontal ligament cells (PDLSCs) in response to Porphyromonas gingivalis. (P. gingivalis)-infected PDLSCs showed distinct metabolomics with metabolic reprogramming from oxidative phosphorylation to glycolysis. In addition, bacteria invasion triggered fundamental changes in glycolysis and tricarboxylate acid (TCA) cycle-related genes, such as the hexokinase (HK), isocitrate dehydrogenase (IDH) and succinate dehydrogenase (SDH). Moreover, P. gingivalis-infected PDLSCs showed accumulation of succinate, elevation in succinate dehydrogenase activity, pileup of reactive oxygen species and activation of hypoxia inducible factor-1α (HIF-1α) pathway. HIF-1α and succinate inhibitors, as well as SDH knockdown alleviated proinflammatory cytokine expression in P. gingivalis-infected PDLSCs. Therefore, targeting metabolic reprogramming by regulating the succinate-SDH-HIF-1α axis may facilitate host modulation therapy of chronic periodontitis.
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Affiliation(s)
- Wenqi Su
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China; Central Laboratory of Stomatology, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Jiahong Shi
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Yunhe Zhao
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Fuhua Yan
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Lang Lei
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China.
| | - Houxuan Li
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China.
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144
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Chattopadhyay C, Oba J, Roszik J, Marszalek JR, Chen K, Qi Y, Eterovic K, Robertson AG, Burks JK, McCannel TA, Grimm EA, Woodman SE. Elevated Endogenous SDHA Drives Pathological Metabolism in Highly Metastatic Uveal Melanoma. Invest Ophthalmol Vis Sci 2019; 60:4187-4195. [PMID: 31596927 PMCID: PMC6785781 DOI: 10.1167/iovs.19-28082] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Purpose Metastatic uveal melanoma (UM) has a very poor prognosis and no effective therapy. Despite remarkable advances in treatment of cutaneous melanoma, UM remains recalcitrant to chemotherapy, small-molecule kinase inhibitors, and immune-based therapy. Methods We assessed two sets of oxidative phosphorylation (OxPhos) genes within 9858 tumors across 31 cancer types. An OxPhos inhibitor was used to characterize differential metabolic programming of highly metastatic monosomy 3 (M3) UM. Seahorse analysis and global metabolomics profiling were done to identify metabolic vulnerabilities. Analyses of UM TCGA data set were performed to determine expressions of key OxPhos effectors in M3 and non-M3 UM. We used targeted knockdown of succinate dehydrogenase A (SDHA) to determine the role of SDHA in M3 UM in conferring resistance to OxPhos inhibition. Results We identified UM to have among the highest median OxPhos levels and showed that M3 UM exhibits a distinct metabolic profile. M3 UM shows markedly low succinate levels and has highly increased levels of SDHA, the enzyme that couples the tricarboxylic acid cycle with OxPhos by oxidizing (lowering) succinate. We showed that SDHA-high M3 UM have elevated expression of key OxPhos molecules, exhibit abundant mitochondrial reserve respiratory capacity, and are resistant to OxPhos antagonism, which can be reversed by SDHA knockdown. Conclusions Our study has identified a critical metabolic program within poor prognostic M3 UM. In addition to the heightened mitochondrial functional capacity due to elevated SDHA, M3 UM SDHA-high mediate resistance to therapy that is reversible with targeted treatment.
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Affiliation(s)
| | - Junna Oba
- Melanoma Medical Oncology, UT MD Anderson Cancer Center, Houston, Texas, United States
| | - Jason Roszik
- Melanoma Medical Oncology, UT MD Anderson Cancer Center, Houston, Texas, United States
- Genomic Medicine, UT MD Anderson Cancer Center, Houston, Texas, United States
| | - Joseph R Marszalek
- Institute of Applied Cancer Science & Center for Co-Clinical Trials, UT MD Anderson Cancer Center, Houston, Texas, United States
| | - Ken Chen
- Bioinformatics & Computational Biology, UT MD Anderson Cancer Center, Houston, Texas, United States
| | - Yuan Qi
- Bioinformatics & Computational Biology, UT MD Anderson Cancer Center, Houston, Texas, United States
| | - Karina Eterovic
- Bioinformatics & Computational Biology, UT MD Anderson Cancer Center, Houston, Texas, United States
| | - A Gordon Robertson
- Canada's Michael Smith Genome Sciences Centre, BC Cancer Agency, Vancouver, British Columbia, Canada
| | - Jared K Burks
- Leukemia, UT MD Anderson Cancer Center, Houston, Texas, United States
| | - Tara A McCannel
- Stein Eye and Doheny Eye Institutes, University of California Los Angeles, Los Angeles, California, United States
| | - Elizabeth A Grimm
- Melanoma Medical Oncology, UT MD Anderson Cancer Center, Houston, Texas, United States
| | - Scott E Woodman
- Melanoma Medical Oncology, UT MD Anderson Cancer Center, Houston, Texas, United States
- Systems Biology, UT MD Anderson Cancer Center, Houston, Texas, United States
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145
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Emmerzaal TL, Rodenburg RJ, Tanila H, Verweij V, Kiliaan AJ, Kozicz T. Age-Dependent Decrease of Mitochondrial Complex II Activity in a Familial Mouse Model for Alzheimer's Disease. J Alzheimers Dis 2019; 66:75-82. [PMID: 30248054 DOI: 10.3233/jad-180337] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Alzheimer's disease (AD) is a severe neurodegenerative disorder for which the exact etiology is largely unknown. An increasingly recognized and investigated notion is the pathogenic role of mitochondrial dysfunction in AD. We assessed mitochondrial oxidative-phosphorylation (OXPHOS) enzyme activities in the APPswe/PS1ΔE9 mouse model from 4.5 to 14 months of age. We show an age-dependent decrease in mitochondrial complex-II activity starting at 9 months in APP/PS1 mice. Other enzymes of the OXPHOS do not show any alterations. Since amyloid-β (Aβ) plaques are already present from 4 months of age, mitochondrial dysfunction likely occurs downstream of Aβ pathology in this mouse model.
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Affiliation(s)
- Tim L Emmerzaal
- Department of Anatomy, Radboud University Medical Center, Donders Institute for Brain Cognition and Behaviour, Nijmegen, The Netherlands
| | - Richard J Rodenburg
- Department of Pediatrics, Radboud Center for Mitochondrial Medicine, Translational Metabolic Laboratory, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Heikki Tanila
- A. I. Virtanen Institute, University of Eastern Finland, Kuopio, Finland
| | - Vivienne Verweij
- Department of Anatomy, Radboud University Medical Center, Donders Institute for Brain Cognition and Behaviour, Nijmegen, The Netherlands
| | - Amanda J Kiliaan
- Department of Anatomy, Radboud University Medical Center, Donders Institute for Brain Cognition and Behaviour, Nijmegen, The Netherlands
| | - Tamas Kozicz
- Department of Anatomy, Radboud University Medical Center, Donders Institute for Brain Cognition and Behaviour, Nijmegen, The Netherlands.,Department of Clinical Genomics, Mayo Clinic, Rochester, MN, USA
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146
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Davis B, To V, Talbot P. Comparison of cytotoxicity of IQOS aerosols to smoke from Marlboro Red and 3R4F reference cigarettes. Toxicol In Vitro 2019; 61:104652. [PMID: 31526836 DOI: 10.1016/j.tiv.2019.104652] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 09/12/2019] [Accepted: 09/12/2019] [Indexed: 01/09/2023]
Abstract
This study compared the cytotoxicity of IQOS aerosols to smoke from Marlboro Red (MR) and 3R4F reference cigarettes. Aerosol/smoke solutions were tested as the gas vapor phase (GVP), particulate phase (total particulate matter or TPM), or whole aerosol/smoke (WA), the latter being what smokers actually inhale. Cytotoxicities were evaluated using the LDH, MTT and neutral red uptake (NRU) assays in conjunction with eight different cell types, mainly from the respiratory system. Most test solutions did not compromise the plasma membranes of cells (LDH). However, mitochondrial activity (MTT) and dye uptake/lysosomal activity (NRU) were equally depressed by IOQS aerosols and cigarette smoke solutions at the high concentrations. Our NRU data with mouse NIH/3T3 transformed fibroblasts were similar to those previously reported by the IQOS manufacturer and showed little cytotoxicity in the NRU assay. In both studies with NIH/3T3 cells, the results were significantly different from 3RF4 cigarette smoke, suggesting reduced toxicity with IQOS. However, by expanding evaluations to a broader spectrum of cells that included respiratory system cells and by including higher concentrations of GVP, as well as WA, cytotoxicity equivalent to that of Marlboro Red and 3R4F cigarettes was frequently observed with IQOS aerosols in the MTT and NRU assays.
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Affiliation(s)
- Barbara Davis
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, CA 92521, United States.
| | - Vivian To
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, CA 92521, United States.
| | - Prue Talbot
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, CA 92521, United States.
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Jaña F, Bustos G, Rivas J, Cruz P, Urra F, Basualto-Alarcón C, Sagredo E, Ríos M, Lovy A, Dong Z, Cerda O, Madesh M, Cárdenas C. Complex I and II are required for normal mitochondrial Ca 2+ homeostasis. Mitochondrion 2019; 49:73-82. [PMID: 31310854 DOI: 10.1016/j.mito.2019.07.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 04/01/2019] [Accepted: 07/12/2019] [Indexed: 01/03/2023]
Abstract
Cytosolic calcium (cCa2+) entry into mitochondria is facilitated by the mitochondrial membrane potential (ΔΨm), an electrochemical gradient generated by the electron transport chain (ETC). Is has been assumed that as long as mutations that affect the ETC do not affect the ΔΨm, the mitochondrial Ca2+ (mCa2+) homeostasis remains normal. We show that knockdown of NDUFAF3 and SDHB reduce ETC activity altering mCa2+ efflux and influx rates while ΔΨm remains intact. Shifting the equilibrium toward lower [Ca2+]m accumulation renders cells resistant to death. Our findings reveal an unexpected relationship between complex I and II with the mCa2+ homeostasis independent of ΔΨm.
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Affiliation(s)
- Fabian Jaña
- Departamento de Ciencias de la Salud, Universidad de Aysén, Coyhaique, Chile; Geroscience Center for Brain Health and Metabolism, Santiago, Chile
| | - Galdo Bustos
- Geroscience Center for Brain Health and Metabolism, Santiago, Chile; Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile
| | - José Rivas
- Departamento de Ciencias de la Salud, Universidad de Aysén, Coyhaique, Chile; Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Pablo Cruz
- Geroscience Center for Brain Health and Metabolism, Santiago, Chile; Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Felix Urra
- Geroscience Center for Brain Health and Metabolism, Santiago, Chile; Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Carla Basualto-Alarcón
- Departamento de Ciencias de la Salud, Universidad de Aysén, Coyhaique, Chile; Geroscience Center for Brain Health and Metabolism, Santiago, Chile; Anatomy and Legal Medicine Department, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Eduardo Sagredo
- Centro de Investigación y Tratamiento del Cáncer, Facultad de Medicina, Universidad de Chile, Chile
| | - Melany Ríos
- Geroscience Center for Brain Health and Metabolism, Santiago, Chile
| | - Alenka Lovy
- Geroscience Center for Brain Health and Metabolism, Santiago, Chile; Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile; Center for Neuroscience Research, Tufts University School of Medicine, Boston, MA, USA
| | - Zhiwei Dong
- Department of Medicine, Center for Precision Medicine, University of Texas Health San Antonio, TX, USA
| | - Oscar Cerda
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (ICBM), Faculty of Medicine, Universidad de Chile, Santiago, Chile; Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD), Santiago, Chile.; The Wound Repair, Treatment and Health (WoRTH), Chile
| | - Muniswamy Madesh
- Department of Medicine, Center for Precision Medicine, University of Texas Health San Antonio, TX, USA.
| | - César Cárdenas
- Geroscience Center for Brain Health and Metabolism, Santiago, Chile; Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile; Buck Institute for Research on Aging, Novato, CA, USA; Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, United States.
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148
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Beaver SK, Mesa-Torres N, Pey AL, Timson DJ. NQO1: A target for the treatment of cancer and neurological diseases, and a model to understand loss of function disease mechanisms. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2019; 1867:663-676. [PMID: 31091472 DOI: 10.1016/j.bbapap.2019.05.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 05/07/2019] [Accepted: 05/09/2019] [Indexed: 01/08/2023]
Abstract
NAD(P)H quinone oxidoreductase 1 (NQO1) is a multi-functional protein that catalyses the reduction of quinones (and other molecules), thus playing roles in xenobiotic detoxification and redox balance, and also has roles in stabilising apoptosis regulators such as p53. The structure and enzymology of NQO1 is well-characterised, showing a substituted enzyme mechanism in which NAD(P)H binds first and reduces an FAD cofactor in the active site, assisted by a charge relay system involving Tyr-155 and His-161. Protein dynamics play important role in physio-pathological aspects of this protein. NQO1 is a good target to treat cancer due to its overexpression in cancer cells. A polymorphic form of NQO1 (p.P187S) is associated with increased cancer risk and certain neurological disorders (such as multiple sclerosis and Alzheimer´s disease), possibly due to its roles in the antioxidant defence. p.P187S has greatly reduced FAD affinity and stability, due to destabilization of the flavin binding site and the C-terminal domain, which leading to reduced activity and enhanced degradation. Suppressor mutations partially restore the activity of p.P187S by local stabilization of these regions, and showing long-range allosteric communication within the protein. Consequently, the correction of NQO1 misfolding by pharmacological chaperones is a viable strategy, which may be useful to treat cancer and some neurological conditions, targeting structural spots linked to specific disease-mechanisms. Thus, NQO1 emerges as a good model to investigate loss of function mechanisms in genetic diseases as well as to improve strategies to discriminate between neutral and pathogenic variants in genome-wide sequencing studies.
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Affiliation(s)
- Sarah K Beaver
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Huxley Building, Lewes Road, Brighton BN2 4GJ, UK
| | - Noel Mesa-Torres
- Department of Physical Chemistry, Faculty of Sciences, University of Granada, Av. Fuentenueva s/n, 18071, Spain
| | - Angel L Pey
- Department of Physical Chemistry, Faculty of Sciences, University of Granada, Av. Fuentenueva s/n, 18071, Spain.
| | - David J Timson
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Huxley Building, Lewes Road, Brighton BN2 4GJ, UK.
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149
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Wang R, Lou X, Feng G, Chen J, Zhu L, Liu X, Yao X, Li P, Wan J, Zhang Y, Ni C, Qin Z. IL-17A-stimulated endothelial fatty acid β-oxidation promotes tumor angiogenesis. Life Sci 2019; 229:46-56. [PMID: 31085243 DOI: 10.1016/j.lfs.2019.05.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 05/08/2019] [Accepted: 05/10/2019] [Indexed: 11/19/2022]
Abstract
AIMS Tumor growth is an angiogenesis-dependent process that requires sustained new vessel growth. Interleukin-17 (IL-17A) is a key cytokine that modulates tumor progression. However, whether IL-17A affects the metabolism of endothelial cells is unknown. MAIN METHODS A xenograft model was established by implanting H460 (human lung cancer cell line) cells transfected with IL-17A-expressing or control vector. The effects of IL-17A on sprouting and tube formation of human umbilical vein endothelial cells (HUVECs) were measured. After treatment with IL-17A, the proliferation and migration of HUVECs were examined. Liquid chromatography-mass spectrometry (LC-MS) and Seahorse were used to detect the effects of IL-17A on mitochondrial respiration and fatty acid β-oxidation (FAO) in HUVECs. Western blotting was used to examine signaling pathways. KEY FINDINGS Herein, we found that IL-17A promoted H460 tumor growth and angiogenesis in vivo and in vitro. Moreover, IL-17A stimulated angiogenesis by enhancing FAO, increasing mitochondrial respiration of endothelial cells. The AMP-activated protein kinase (AMPK) signaling pathway was activated to promote FAO. Finally, IL-17A-induced angiogenesis was blocked when FAO was inhibited using etomoxir. SIGNIFICANCE In summary, these results indicate that IL-17A stimulates angiogenesis by promoting FAO. Thus, our study might provide a new therapeutic target for angiogenic vascular disorders.
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Affiliation(s)
- Ruirui Wang
- Medical Research Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China
| | - Xiaohan Lou
- Medical Research Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China
| | - Guang Feng
- Department of Orthopedics, Zhengzhou Central Hospital, Zhengzhou, Henan Province 450052, China
| | - Jinfeng Chen
- Research Center for Clinical System Biology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China
| | - Linyu Zhu
- Medical Research Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China
| | - Xiaomeng Liu
- Medical Research Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China
| | - Xiaohan Yao
- Medical Research Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China
| | - Pan Li
- Department of Pathology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China
| | - Jiajia Wan
- Medical Research Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China
| | - Yi Zhang
- Biotherapy Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China
| | - Chen Ni
- Medical Research Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China.
| | - Zhihai Qin
- Medical Research Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province 450052, China; Key Laboratory of Protein and Peptide Pharmaceuticals, CAS-University of Tokyo Joint Laboratory of Structural Virology and Immunology, Institute of Biophysics, Chinese Academy of Sciences, University of the Chinese Academy of Sciences, Beijing, 100000, China.
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150
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Zhao RZ, Jiang S, Zhang L, Yu ZB. Mitochondrial electron transport chain, ROS generation and uncoupling (Review). Int J Mol Med 2019; 44:3-15. [PMID: 31115493 PMCID: PMC6559295 DOI: 10.3892/ijmm.2019.4188] [Citation(s) in RCA: 427] [Impact Index Per Article: 85.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 04/19/2019] [Indexed: 12/18/2022] Open
Abstract
The mammalian mitochondrial electron transport chain (ETC) includes complexes I-IV, as well as the electron transporters ubiquinone and cytochrome c. There are two electron transport pathways in the ETC: Complex I/III/IV, with NADH as the substrate and complex II/III/IV, with succinic acid as the substrate. The electron flow is coupled with the generation of a proton gradient across the inner membrane and the energy accumulated in the proton gradient is used by complex V (ATP synthase) to produce ATP. The first part of this review briefly introduces the structure and function of complexes I-IV and ATP synthase, including the specific electron transfer process in each complex. Some electrons are directly transferred to O2 to generate reactive oxygen species (ROS) in the ETC. The second part of this review discusses the sites of ROS generation in each ETC complex, including sites IF and IQ in complex I, site IIF in complex II and site IIIQo in complex III, and the physiological and pathological regulation of ROS. As signaling molecules, ROS play an important role in cell proliferation, hypoxia adaptation and cell fate determination, but excessive ROS can cause irreversible cell damage and even cell death. The occurrence and development of a number of diseases are closely related to ROS overproduction. Finally, proton leak and uncoupling proteins (UCPS) are discussed. Proton leak consists of basal proton leak and induced proton leak. Induced proton leak is precisely regulated and induced by UCPs. A total of five UCPs (UCP1-5) have been identified in mammalian cells. UCP1 mainly plays a role in the maintenance of body temperature in a cold environment through non-shivering thermogenesis. The core role of UCP2-5 is to reduce oxidative stress under certain conditions, therefore exerting cytoprotective effects. All diseases involving oxidative stress are associated with UCPs.
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Affiliation(s)
- Ru-Zhou Zhao
- Department of Aerospace Physiology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Shuai Jiang
- Department of Aerospace Physiology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Lin Zhang
- Department of Aerospace Physiology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Zhi-Bin Yu
- Department of Aerospace Physiology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
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