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Yan H, Meng Y, Li X, Xiang R, Hou S, Wang J, Wang L, Yu X, Xu M, Chi Y, Yang J. FAM3A maintains metabolic homeostasis by interacting with F1-ATP synthase to regulate the activity and assembly of ATP synthase. Metabolism 2023; 139:155372. [PMID: 36470472 DOI: 10.1016/j.metabol.2022.155372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 11/12/2022] [Accepted: 11/25/2022] [Indexed: 12/12/2022]
Abstract
Reduced mitochondrial ATP synthase (ATPS) capacity plays crucial roles in the pathogenesis of metabolic disorders. However, there is currently no effective strategy for synchronously stimulating the expressions of ATPS key subunits to restore its assembly. This study determined the roles of mitochondrial protein FAM3A in regulating the activity and assembly of ATPS in hepatocytes. FAM3A is localized in mitochondrial matrix, where it interacts with F1-ATPS to initially activate ATP synthesis and release, and released ATP further activates P2 receptor-Akt-CREB pathway to induce FOXD3 expression. FOXD3 synchronously stimulates the transcriptions of ATPS key subunits and assembly genes to increase its assembly and capacity, augmenting ATP synthesis and inhibiting ROS production. FAM3A, FOXD3 and ATPS expressions were reduced in livers of diabetic mice and NAFLD patients. FOXD3 expression, ATPS capacity and ATP content were reduced in various tissues of FAM3A-deficient mice with dysregulated glucose and lipid metabolism. Hepatic FOXD3 activation increased ATPS assembly to ameliorate dysregulated glucose and lipid metabolism in obese mice. Hepatic FOXD3 inhibition or knockout reduced ATPS capacity to aggravate HFD-induced hyperglycemia and steatosis. In conclusion, FAM3A is an active ATPS component, and regulates its activity and assembly by activating FOXD3. Activating FAM3A-FOXD3 axis represents a viable strategy for restoring ATPS assembly to treat metabolic disorders.
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Affiliation(s)
- Han Yan
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Science of the Ministry of Education, Center for Non-coding RNA Medicine, Peking University Health Science Center, Beijing 100191, China
| | - Yuhong Meng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Science of the Ministry of Education, Center for Non-coding RNA Medicine, Peking University Health Science Center, Beijing 100191, China
| | - Xin Li
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Science of the Ministry of Education, Center for Non-coding RNA Medicine, Peking University Health Science Center, Beijing 100191, China
| | - Rui Xiang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Science of the Ministry of Education, Center for Non-coding RNA Medicine, Peking University Health Science Center, Beijing 100191, China
| | - Song Hou
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Science of the Ministry of Education, Center for Non-coding RNA Medicine, Peking University Health Science Center, Beijing 100191, China
| | - Junpei Wang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Science of the Ministry of Education, Center for Non-coding RNA Medicine, Peking University Health Science Center, Beijing 100191, China
| | - Lin Wang
- Department of Hepatobiliary Surgery, Xi-Jing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Xiaoxing Yu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Science of the Ministry of Education, Center for Non-coding RNA Medicine, Peking University Health Science Center, Beijing 100191, China
| | - Ming Xu
- Department of Cardiology, Institute of Vascular Medicine, Peking University Third Hospital, Key Laboratory of Molecular Cardiovascular Science of the Ministry of Education, Beijing 100191, China
| | - Yujing Chi
- Department of Central Laboratory and Institute of Clinical Molecular Biology, Peking University People's Hospital, Beijing 100044, China.
| | - Jichun Yang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Science of the Ministry of Education, Center for Non-coding RNA Medicine, Peking University Health Science Center, Beijing 100191, China.
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Insights into the Metabolic Response of Lactiplantibacillus plantarum CCFM1287 upon Patulin Exposure. Int J Mol Sci 2022; 23:ijms231911652. [PMID: 36232948 PMCID: PMC9570479 DOI: 10.3390/ijms231911652] [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: 09/06/2022] [Revised: 09/27/2022] [Accepted: 09/28/2022] [Indexed: 11/17/2022] Open
Abstract
Patulin (PAT) is a common mycotoxin in the food industry, and is found in apple products in particular. Consumption of food or feed contaminated with PAT can cause acute or chronic toxicity in humans and animals. Lactiplantibacillus plantarum CCFM1287 is a probiotic strain that effectively degrades PAT in PBS and food systems. In this study, it was found that the concentration of PAT (50 mg/L) in MRS medium decreased by 85.09% during the first stages of CCFM1287 growth, and this change was consistent with the first-order degradation kinetic model. Meanwhile, the regulation of oxidative stress by L. plantarum CCFM1287 in response to PAT exposure and metabolic changes that occur during PAT degradation were investigated. The degree of intracellular damage was attenuated after 16 h of exposure compared to 8 h. Meanwhile, metabolomic data showed that 30 and 29 significantly different metabolites were screened intracellularly in the strain after 8 h and 16 h of PAT stress at 50 mg/L, respectively. The results of pathway enrichment analysis suggested that the purine metabolic pathway was significantly enriched at both 8 h and 16 h. However, as is consistent with the performance of the antioxidant system, the changes in Lactiplantibacillus diminished with increasing time of PAT exposure. Therefore, this study helps to further explain the mechanism of PAT degradation by L. plantarum CCFM1287.
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Zhou Z, Zhang K, Liu Z, Gao X, Huang K, Chen C, Wang D, Yang Q, Long Q. ATPAF1 deficiency impairs ATP synthase assembly and mitochondrial respiration. Mitochondrion 2021; 60:129-141. [PMID: 34375736 DOI: 10.1016/j.mito.2021.08.005] [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: 03/03/2021] [Revised: 07/08/2021] [Accepted: 08/05/2021] [Indexed: 11/28/2022]
Abstract
ATP11p and ATP12p are two nuclear-encoded mitochondrial chaperone proteins required for assembling the F1Fo-ATP synthase F1 sector. ATPAF1 and ATPAF2 are the mammalian homologs of ATP11p and ATP12p. However, the biochemical and physiological relevance of ATPAF1 and ATPAF2 in animal tissues with high energy-dependence remains unclear. To explore the in vivo role of ATP assembly and the effects of ATP synthase deficiency in animals, we have generated knockout (KO) mouse models of these assembly factors using CRISPR/Cas9 technology. While the Atpaf2-KO mice were embryonically lethal, Atpaf1-KO mice grew to adulthood but with smaller body sizes and elevated blood lactate later in life. We specifically investigated how ATPAF1 deficiency may affect ATP synthase biogenesis and mitochondrial respiration in the mouse heart, an organ highly energy-dependent. Western blots and Blue-Native electrophoresis (BN-PAGE) demonstrated a decreased F1 content and ATP synthase dimers in the Atpaf1-KO heart. Mitochondria from ATPAF1-deficient hearts showed ultrastructural abnormalities with condensed degenerated mitochondria, loss of cristae, and impaired respiratory capacity. ATP synthase deficiency also leads to impaired autophagy and mitochondrial dynamic. Consequently, decreased cardiac function was exhibited in adult Atpaf1-KO mice. The results provide strong support that ATPAF1 is essential for ATP synthase assembly and mitochondrial oxidative phosphorylation, thus playing a crucial role in maintaining cardiac structure and function in animals.
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Affiliation(s)
- Zhou Zhou
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Ave, Wuhan 430030, China
| | - Kailiang Zhang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Ave, Wuhan 430030, China
| | - Zhiheng Liu
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Ave, Wuhan 430030, China
| | - Xu Gao
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Ave, Wuhan 430030, China
| | - Kai Huang
- Department of Cardiovascular Diseases, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Chen Chen
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Ave, Wuhan 430030, China
| | - Daowen Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Ave, Wuhan 430030, China
| | - Qinglin Yang
- Cardiovascular Center of Excellence and Department of Pharmacology, Louisiana State University Health Science Center-New Orleans, LA 70112, United States; Department of Nutrition Science, University of Alabama at Birmingham, Birmingham, AL 35294, United States.
| | - Qinqiang Long
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Ave, Wuhan 430030, China; Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Institute of Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou 510006, China; Department of Nutrition Science, University of Alabama at Birmingham, Birmingham, AL 35294, United States.
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Homoplasmic deleterious MT-ATP6/8 mutations in adult patients. Mitochondrion 2020; 55:64-77. [PMID: 32858252 DOI: 10.1016/j.mito.2020.08.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/13/2020] [Accepted: 08/14/2020] [Indexed: 01/10/2023]
Abstract
To address the frequency of complex V defects, we systematically sequenced MT-ATP6/8 genes in 512 consecutive patients. We performed functional analysis in muscle or fibroblasts for 12 out of 27 putative homoplasmic mutations and in cybrids for four. Fibroblasts, muscle and cybrids with known deleterious mutations underwent parallel analysis. It included oxidative phosphorylation spectrophotometric assays, western blots, structural analysis, ATP production, glycolysis and cell proliferation evaluation. We demonstrated the deleterious nature of three original mutations. Striking gradation in severity of the mutations consequences and differences between muscle, fibroblasts and cybrids implied a likely under-diagnosis of human complex V defects.
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Pecinová A, Alán L, Brázdová A, Vrbacký M, Pecina P, Drahota Z, Houštěk J, Mráček T. Role of Mitochondrial Glycerol-3-Phosphate Dehydrogenase in Metabolic Adaptations of Prostate Cancer. Cells 2020; 9:cells9081764. [PMID: 32717855 PMCID: PMC7464303 DOI: 10.3390/cells9081764] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/14/2020] [Accepted: 07/22/2020] [Indexed: 12/26/2022] Open
Abstract
Prostate cancer is one of the most prominent cancers diagnosed in males. Contrasting with other cancer types, glucose utilization is not increased in prostate carcinoma cells as they employ different metabolic adaptations involving mitochondria as a source of energy and intermediates required for rapid cell growth. In this regard, prostate cancer cells were associated with higher activity of mitochondrial glycerol-3-phosphate dehydrogenase (mGPDH), the key rate limiting component of the glycerophosphate shuttle, which connects mitochondrial and cytosolic processes and plays significant role in cellular bioenergetics. Our research focused on the role of mGPDH biogenesis and regulation in prostate cancer compared to healthy cells. We show that the 42 amino acid presequence is cleaved from N-terminus during mGPDH biogenesis. Only the processed form is part of the mGPDH dimer that is the prominent functional enzyme entity. We demonstrate that mGPDH overexpression enhances the wound healing ability in prostate cancer cells. As mGPDH is at the crossroad of glycolysis, lipogenesis and oxidative metabolism, regulation of its activity by intramitochondrial processing might represent rapid means of cellular metabolic adaptations.
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Alfaro GF, Novak TE, Rodning SP, Moisá SJ. Preconditioning beef cattle for long-duration transportation stress with rumen-protected methionine supplementation: A nutrigenetics study. PLoS One 2020; 15:e0235481. [PMID: 32614880 PMCID: PMC7332072 DOI: 10.1371/journal.pone.0235481] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Accepted: 06/16/2020] [Indexed: 01/03/2023] Open
Abstract
In general, beef cattle long-distance transportation from cow-calf operations to feedlots or from feedlots to abattoirs is a common situation in the beef industry. The aim of this study was to determine the effect of rumen-protected methionine (RPM) supplementation on a proposed gene network for muscle fatigue, creatine synthesis (CKM), and reactive oxygen species (ROS) metabolism after a transportation simulation in a test track. Angus × Simmental heifers (n = 18) were stratified by body weight (408 ± 64 kg; BW) and randomly assigned to dietary treatments: 1) control diet (CTRL) or 2) control diet + 8 gr/hd/day of top-dressed rumen-protected methionine (RPM). After an adaptation period to Calan gates, animals received the mentioned dietary treatment consisting of Bermuda hay ad libitum and a soy hulls and corn gluten feed based supplement. After 45 days of supplementation, animals were loaded onto a trailer and transported for 22 hours (long-term transportation). Longissimus muscle biopsies, BW and blood samples were obtained on day 0 (Baseline), 43 (Pre-transport; PRET), and 46 (Post-transport; POST). Heifers' average daily gain did not differ between baseline and PRET. Control heifer's shrink was 10% of BW while RPM heifers shrink was 8%. Serum cortisol decreased, and glucose and creatine kinase levels increased after transportation, but no differences were observed between treatments. Messenger RNA was extracted from skeletal muscle tissue and gene expression analysis was performed by RT-qPCR. Results showed that AHCY and DNMT3A (DNA methylation), SSPN (Sarcoglycan complex), and SOD2 (Oxidative Stress-ROS) were upregulated in CTRL between baseline and PRET and, decreased between pre and POST while they remained constant for RPM. Furthermore, CKM was not affected by treatments. In conclusion, RPM supplementation may affect ROS production and enhance DNA hypermethylation, after a long-term transportation.
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Affiliation(s)
- Gastón F. Alfaro
- Department of Animal Sciences, Auburn University, Auburn, AL, United States of America
| | - Taylor E. Novak
- Department of Animal Sciences, Auburn University, Auburn, AL, United States of America
| | - Soren P. Rodning
- Department of Animal Sciences, Auburn University, Auburn, AL, United States of America
| | - Sonia J. Moisá
- Department of Animal Sciences, Auburn University, Auburn, AL, United States of America
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Xu Z, Chen J, Cai J, Xiao Y, Wang Q, Chen S, Zhang L, Wu Z. Mitochondrial ATP synthase regulates corpus cavernosum smooth muscle cell function in vivo and in vitro. Exp Ther Med 2020; 19:3497-3504. [PMID: 32346410 PMCID: PMC7185181 DOI: 10.3892/etm.2020.8637] [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: 03/27/2019] [Accepted: 12/19/2019] [Indexed: 11/06/2022] Open
Abstract
Adenosine triphosphate (ATP) levels are closely associated with diabetes-related erectile dysfunction (DMED). Mitochondrial ATP synthase serves a key role in ATP production. The present study aimed to investigate the relationship between F1-ATP synthase and DMED in vivo and in vitro. The F1-ATP synthase expression levels in corpus cavernosum tissues from rats with DMED were examined. F1-ATP synthase expression was found to be lower in corpus cavernosum tissues from rats with DMED compared with healthy controls, suggesting a role for ATP synthase under high glucose conditions. In addition, the present study also demonstrated that hyperglycemia could downregulate F1-ATP synthase expression in rat corpus cavernosum smooth muscle cells (CCSMCs) in vitro. The overexpression of F1-ATP synthase in CCSMCs influenced the phenotypic CCSMC transformation, upregulated eNOS expression, increased cGMP levels and reduced CCSMC apoptosis under high glucose in vitro. In conclusion, the present study indicates that the upregulation of mitochondrial ATP synthase expression may improve CCSMC function, suggesting that mitochondrial ATP synthase could serve as a potential therapeutic target for the treatment of DMED.
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Affiliation(s)
- Ziqiang Xu
- Department of Transplantation, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Jihao Chen
- Department of Transplantation, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Jian Cai
- Department of Andrology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Yunbei Xiao
- Department of Andrology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Qinquan Wang
- Department of Andrology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Shuowei Chen
- The Second Department of Medicine, Renji School, Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Lei Zhang
- Department of Urology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Zhigang Wu
- Department of Andrology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
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Pajuelo Reguera D, Čunátová K, Vrbacký M, Pecinová A, Houštěk J, Mráček T, Pecina P. Cytochrome c Oxidase Subunit 4 Isoform Exchange Results in Modulation of Oxygen Affinity. Cells 2020; 9:cells9020443. [PMID: 32075102 PMCID: PMC7072730 DOI: 10.3390/cells9020443] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 02/11/2020] [Accepted: 02/11/2020] [Indexed: 01/05/2023] Open
Abstract
Cytochrome c oxidase (COX) is regulated through tissue-, development- or environment-controlled expression of subunit isoforms. The COX4 subunit is thought to optimize respiratory chain function according to oxygen-controlled expression of its isoforms COX4i1 and COX4i2. However, biochemical mechanisms of regulation by the two variants are only partly understood. We created an HEK293-based knock-out cellular model devoid of both isoforms (COX4i1/2 KO). Subsequent knock-in of COX4i1 or COX4i2 generated cells with exclusive expression of respective isoform. Both isoforms complemented the respiratory defect of COX4i1/2 KO. The content, composition, and incorporation of COX into supercomplexes were comparable in COX4i1- and COX4i2-expressing cells. Also, COX activity, cytochrome c affinity, and respiratory rates were undistinguishable in cells expressing either isoform. Analysis of energy metabolism and the redox state in intact cells uncovered modestly increased preference for mitochondrial ATP production, consistent with the increased NADH pool oxidation and lower ROS in COX4i2-expressing cells in normoxia. Most remarkable changes were uncovered in COX oxygen kinetics. The p50 (partial pressure of oxygen at half-maximal respiration) was increased twofold in COX4i2 versus COX4i1 cells, indicating decreased oxygen affinity of the COX4i2-containing enzyme. Our finding supports the key role of the COX4i2-containing enzyme in hypoxia-sensing pathways of energy metabolism.
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Affiliation(s)
- David Pajuelo Reguera
- Department of Bioenergetics, Institute of Physiology, Czech Academy of Sciences, 14220 Prague 4, Czech Republic; (D.P.R.); (K.Č.); (M.V.); (A.P.); (J.H.)
| | - Kristýna Čunátová
- Department of Bioenergetics, Institute of Physiology, Czech Academy of Sciences, 14220 Prague 4, Czech Republic; (D.P.R.); (K.Č.); (M.V.); (A.P.); (J.H.)
- Department of Cell Biology, Faculty of Science, Charles University, 12000 Prague 2, Czech Republic
| | - Marek Vrbacký
- Department of Bioenergetics, Institute of Physiology, Czech Academy of Sciences, 14220 Prague 4, Czech Republic; (D.P.R.); (K.Č.); (M.V.); (A.P.); (J.H.)
| | - Alena Pecinová
- Department of Bioenergetics, Institute of Physiology, Czech Academy of Sciences, 14220 Prague 4, Czech Republic; (D.P.R.); (K.Č.); (M.V.); (A.P.); (J.H.)
| | - Josef Houštěk
- Department of Bioenergetics, Institute of Physiology, Czech Academy of Sciences, 14220 Prague 4, Czech Republic; (D.P.R.); (K.Č.); (M.V.); (A.P.); (J.H.)
| | - Tomáš Mráček
- Department of Bioenergetics, Institute of Physiology, Czech Academy of Sciences, 14220 Prague 4, Czech Republic; (D.P.R.); (K.Č.); (M.V.); (A.P.); (J.H.)
- Correspondence: (T.M.); (P.P.)
| | - Petr Pecina
- Department of Bioenergetics, Institute of Physiology, Czech Academy of Sciences, 14220 Prague 4, Czech Republic; (D.P.R.); (K.Č.); (M.V.); (A.P.); (J.H.)
- Correspondence: (T.M.); (P.P.)
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Bugiardini E, Bottani E, Marchet S, Poole OV, Beninca C, Horga A, Woodward C, Lam A, Hargreaves I, Chalasani A, Valerio A, Lamantea E, Venner K, Holton JL, Zeviani M, Houlden H, Quinlivan R, Lamperti C, Hanna MG, Pitceathly RDS. Expanding the molecular and phenotypic spectrum of truncating MT-ATP6 mutations. NEUROLOGY-GENETICS 2020; 6:e381. [PMID: 32042910 PMCID: PMC6984135 DOI: 10.1212/nxg.0000000000000381] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 10/22/2019] [Indexed: 01/26/2023]
Abstract
Objective To describe the clinical and functional consequences of 1 novel and 1 previously reported truncating MT-ATP6 mutation. Methods Three unrelated probands with mitochondrial encephalomyopathy harboring truncating MT-ATP6 mutations are reported. Transmitochondrial cybrid cell studies were used to confirm pathogenicity of 1 novel variant, and the effects of all 3 mutations on ATPase 6 and complex V structure and function were investigated. Results Patient 1 presented with adult-onset cerebellar ataxia, chronic kidney disease, and diabetes, whereas patient 2 had myoclonic epilepsy and cerebellar ataxia; both harbored the novel m.8782G>A; p.(Gly86*) mutation. Patient 3 exhibited cognitive decline, with posterior white matter abnormalities on brain MRI, and severely impaired renal function requiring transplantation. The m.8618dup; p.(Thr33Hisfs*32) mutation, previously associated with neurogenic muscle weakness, ataxia, and retinitis pigmentosa, was identified. All 3 probands demonstrated a broad range of heteroplasmy across different tissue types. Blue-native gel electrophoresis of cultured fibroblasts and skeletal muscle tissue confirmed multiple bands, suggestive of impaired complex V assembly. Microscale oxygraphy showed reduced basal respiration and adenosine triphosphate synthesis, while reactive oxygen species generation was increased. Transmitochondrial cybrid cell lines studies confirmed the deleterious effects of the novel m.8782 G>A; p.(Gly86*) mutation. Conclusions We expand the clinical and molecular spectrum of MT-ATP6-related mitochondrial disorders to include leukodystrophy, renal disease, and myoclonic epilepsy with cerebellar ataxia. Truncating MT-ATP6 mutations may exhibit highly variable mutant levels across different tissue types, an important consideration during genetic counseling.
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Affiliation(s)
- Enrico Bugiardini
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Emanuela Bottani
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Silvia Marchet
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Olivia V Poole
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Cristiane Beninca
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Alejandro Horga
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Cathy Woodward
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Amanda Lam
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Iain Hargreaves
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Annapurna Chalasani
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Alessandra Valerio
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Eleonora Lamantea
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Kerrie Venner
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Janice L Holton
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Massimo Zeviani
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Henry Houlden
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Rosaline Quinlivan
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Costanza Lamperti
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Michael G Hanna
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
| | - Robert D S Pitceathly
- Department of Neuromuscular Diseases (E. Bugiardini, O.V.P, A.H., H.H., R.Q., M.G.H., R.D.S.P.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom; Mitochondrial Medicine Group (E. Bottani, C.B., M.Z.), Medical Research Council Mitochondrial Biology Unit, Cambridge, United Kingdom; Department of Molecular and Translational Medicine (E. Bottani, A.V.), University of Brescia; Medical Genetics and Neurogenetics Unit (S.M., E.L., C.L.), Fondazione IRCCS Istituto Neurologico, "C. Besta," Milan, Italy; Neurogenetics Unit (C.W.), and Neurometabolic Unit (A.L., I.H., A.C.), The National Hospital for Neurology and Neurosurgery; Division of Neuropathology (K.V., J.L.H.), UCL Queen Square Institute of Neurology; and Dubowitz Neuromuscular Centre (R.Q.), Great Ormond Street Hospital, London, United Kingdom
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10
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Biochemical thresholds for pathological presentation of ATP synthase deficiencies. Biochem Biophys Res Commun 2020; 521:1036-1041. [DOI: 10.1016/j.bbrc.2019.11.033] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 11/05/2019] [Indexed: 12/11/2022]
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11
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Protein carbamylation exacerbates vascular calcification. Kidney Int 2018; 94:72-90. [DOI: 10.1016/j.kint.2018.01.033] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 01/20/2018] [Accepted: 01/25/2018] [Indexed: 01/06/2023]
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12
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Vrbacký M, Kovalčíková J, Chawengsaksophak K, Beck IM, Mráček T, Nůsková H, Sedmera D, Papoušek F, Kolář F, Sobol M, Hozák P, Sedlacek R, Houštěk J. Knockout of Tmem70 alters biogenesis of ATP synthase and leads to embryonal lethality in mice. Hum Mol Genet 2018; 25:4674-4685. [PMID: 28173120 DOI: 10.1093/hmg/ddw295] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 08/22/2016] [Accepted: 08/23/2016] [Indexed: 12/24/2022] Open
Abstract
TMEM70, a 21-kDa protein localized in the inner mitochondrial membrane, has been shown to facilitate the biogenesis of mammalian F1Fo ATP synthase. Mutations of the TMEM70 gene represent the most frequent cause of isolated ATP synthase deficiency resulting in a severe mitochondrial disease presenting as neonatal encephalo-cardiomyopathy (OMIM 604273). To better understand the biological role of this factor, we generated Tmem70-deficient mice and found that the homozygous Tmem70-/- knockouts exhibited profound growth retardation and embryonic lethality at ∼9.5 days post coitum. Blue-Native electrophoresis demonstrated an isolated deficiency in fully assembled ATP synthase in the Tmem70-/- embryos (80% decrease) and a marked accumulation of F1 complexes indicative of impairment in ATP synthase biogenesis that was stalled at the early stage, following the formation of F1 oligomer. Consequently, a decrease in ADP-stimulated State 3 respiration, respiratory control ratio and ATP/ADP ratios, indicated compromised mitochondrial ATP production. Tmem70-/- embryos exhibited delayed development of the cardiovascular system and a disturbed heart mitochondrial ultrastructure, with concentric or irregular cristae structures. Tmem70+/- heterozygous mice were fully viable and displayed normal postnatal growth and development of the mitochondrial oxidative phosphorylation system. Nevertheless, they presented with mild deterioration of heart function. Our results demonstrated that Tmem70 knockout in the mouse results in embryonic lethality due to the lack of ATP synthase and impairment of mitochondrial energy provision. This is analogous to TMEM70 dysfunction in humans and verifies the crucial role of this factor in the biosynthesis and assembly of mammalian ATP synthase.
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Affiliation(s)
- Marek Vrbacký
- Department of Bioenergetics, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Jana Kovalčíková
- Department of Bioenergetics, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic.,First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Kallayanee Chawengsaksophak
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic.,Laboratory of Transgenic Models of Diseases, Division BIOCEV, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Inken M Beck
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Tomáš Mráček
- Department of Bioenergetics, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Hana Nůsková
- Department of Bioenergetics, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - David Sedmera
- Department of Cardiovascular Morphogenesis, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic,Institute of Anatomy, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - František Papoušek
- Department of Developmental Cardiology, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - František Kolář
- Department of Developmental Cardiology, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Margarita Sobol
- Laboratory of Biology of the Cell Nucleus, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Pavel Hozák
- Laboratory of Biology of the Cell Nucleus, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Radislav Sedlacek
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic.,Laboratory of Transgenic Models of Diseases, Division BIOCEV, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Josef Houštěk
- Department of Bioenergetics, Institute of Physiology of the Czech Academy of Sciences, Prague, Czech Republic
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13
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Manta AK, Papadopoulou D, Polyzos AP, Fragopoulou AF, Skouroliakou AS, Thanos D, Stravopodis DJ, Margaritis LH. Mobile-phone radiation-induced perturbation of gene-expression profiling, redox equilibrium and sporadic-apoptosis control in the ovary of Drosophila melanogaster. Fly (Austin) 2016; 11:75-95. [PMID: 27960592 DOI: 10.1080/19336934.2016.1270487] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The daily use by people of wireless communication devices has increased exponentially in the last decade, begetting concerns regarding its potential health hazards. Drosophila melanogaster four days-old adult female flies were exposed for 30 min to radiation emitted by a commercial mobile phone at a SAR of 0.15 W/kg and a SAE of 270 J/kg. ROS levels and apoptotic follicles were assayed in parallel with a genome-wide microarrays analysis. ROS cellular contents were found to increase by 1.6-fold (x), immediately after the end of exposure, in follicles of pre-choriogenic stages (germarium - stage 10), while sporadically generated apoptotic follicles (germarium 2b and stages 7-9) presented with an averaged 2x upregulation in their sub-population mass, 4 h after fly's irradiation with mobile device. Microarray analysis revealed 168 genes being differentially expressed, 2 h post-exposure, in response to radiofrequency (RF) electromagnetic field-radiation exposure (≥1.25x, P < 0.05) and associated with multiple and critical biological processes, such as basic metabolism and cellular subroutines related to stress response and apoptotic death. Exposure of adult flies to mobile-phone radiation for 30 min has an immediate impact on ROS production in animal's ovary, which seems to cause a global, systemic and non-targeted transcriptional reprogramming of gene expression, 2 h post-exposure, being finally followed by induction of apoptosis 4 h after the end of exposure. Conclusively, this unique type of pulsed radiation, mainly being derived from daily used mobile phones, seems capable of mobilizing critical cytopathic mechanisms, and altering fundamental genetic programs and networks in D. melanogaster.
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Affiliation(s)
- Areti K Manta
- a Section of Cell Biology and Biophysics, Department of Biology , National and Kapodistrian University of Athens , Athens , Greece
| | - Deppie Papadopoulou
- b Basic Research Center , Biomedical Research Foundation of the Academy of Athens , Athens , Greece
| | - Alexander P Polyzos
- b Basic Research Center , Biomedical Research Foundation of the Academy of Athens , Athens , Greece
| | - Adamantia F Fragopoulou
- a Section of Cell Biology and Biophysics, Department of Biology , National and Kapodistrian University of Athens , Athens , Greece
| | - Aikaterini S Skouroliakou
- c Department of Energy Technology Engineering , Technological Educational Institute of Athens , Athens , Greece
| | - Dimitris Thanos
- b Basic Research Center , Biomedical Research Foundation of the Academy of Athens , Athens , Greece
| | - Dimitrios J Stravopodis
- a Section of Cell Biology and Biophysics, Department of Biology , National and Kapodistrian University of Athens , Athens , Greece
| | - Lukas H Margaritis
- a Section of Cell Biology and Biophysics, Department of Biology , National and Kapodistrian University of Athens , Athens , Greece
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14
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Su D, Zhang R, Zhang C, Huang F, Xiao J, Deng Y, Wei Z, Zhang Y, Chi J, Zhang M. Phenolic-rich lychee (Litchi chinensis Sonn.) pulp extracts offer hepatoprotection against restraint stress-induced liver injury in mice by modulating mitochondrial dysfunction. Food Funct 2016; 7:508-15. [PMID: 26569420 DOI: 10.1039/c5fo00975h] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The pulp from lychee, a tropical to subtropical fruit, contains large quantities of phenolic compounds and exhibits antioxidant activities both in vitro and in vivo. In the present study, we investigated the mechanisms underlying the hepatoprotective effects of lychee pulp phenolics (LPPs) against restraint stress-induced liver injury in mice. After 18 h of restraint stress, increased levels of serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activities were observed. High levels of thiobarbituric acid reactive substances (TBARS) were also found. Restraint stress causes liver damage, which was protected against by LPP pretreatment at a dosage of 200 mg (kg d)(-1) for 21 consecutive days. This treatment remarkably decreased the serum ALT, AST and TBARS levels, elevated the liver glutathione (GSH) content, and the activities of glutathione peroxidase (GPx), superoxide dismutase (SOD) and catalase (CAT). Furthermore, respiratory chain complex and Na(+)-K(+)-ATPase activities were enhanced in liver mitochondria, while mitochondrial membrane potential levels and reactive oxygen species (ROS) production decreased. Thus, treatment with LPPs ameliorated restraint stress-induced liver mitochondrial dysfunction. These results suggest that LPPs protect the liver against restraint stress-induced damage by scavenging free radicals and modulating mitochondrial dysfunction. Thus, lychee pulp may be a functional biofactor to mitigate oxidative stress.
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Affiliation(s)
- Dongxiao Su
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China. and Department of Food Science and Engineering, College of Life Science, Yangtze University, Jingzhou, Hubei 434025, P. R. China
| | - Ruifen Zhang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Cuilan Zhang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Fei Huang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Juan Xiao
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Yuanyuan Deng
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Zhencheng Wei
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Yan Zhang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Jianwei Chi
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Mingwei Zhang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China. and Department of Food Science and Engineering, College of Life Science, Yangtze University, Jingzhou, Hubei 434025, P. R. China
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15
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Antoniel M, Giorgio V, Fogolari F, Glick GD, Bernardi P, Lippe G. The oligomycin-sensitivity conferring protein of mitochondrial ATP synthase: emerging new roles in mitochondrial pathophysiology. Int J Mol Sci 2014; 15:7513-36. [PMID: 24786291 PMCID: PMC4057687 DOI: 10.3390/ijms15057513] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2014] [Revised: 04/18/2014] [Accepted: 04/21/2014] [Indexed: 01/08/2023] Open
Abstract
The oligomycin-sensitivity conferring protein (OSCP) of the mitochondrial F(O)F1 ATP synthase has long been recognized to be essential for the coupling of proton transport to ATP synthesis. Located on top of the catalytic F1 sector, it makes stable contacts with both F1 and the peripheral stalk, ensuring the structural and functional coupling between F(O) and F1, which is disrupted by the antibiotic, oligomycin. Recent data have established that OSCP is the binding target of cyclophilin (CyP) D, a well-characterized inducer of the mitochondrial permeability transition pore (PTP), whose opening can precipitate cell death. CyPD binding affects ATP synthase activity, and most importantly, it decreases the threshold matrix Ca²⁺ required for PTP opening, in striking analogy with benzodiazepine 423, an apoptosis-inducing agent that also binds OSCP. These findings are consistent with the demonstration that dimers of ATP synthase generate Ca²⁺-dependent currents with features indistinguishable from those of the PTP and suggest that ATP synthase is directly involved in PTP formation, although the underlying mechanism remains to be established. In this scenario, OSCP appears to play a fundamental role, sensing the signal(s) that switches the enzyme of life in a channel able to precipitate cell death.
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Affiliation(s)
- Manuela Antoniel
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/B, 35121 Padua, Italy.
| | - Valentina Giorgio
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/B, 35121 Padua, Italy.
| | - Federico Fogolari
- Department of Biomedical Sciences, University of Udine, p.le Kolbe, 33100 Udine, Italy.
| | - Gary D Glick
- Department of Chemistry, Graduate Program in Immunology, University of Michigan, Ann Arbor, MI 48109, USA.
| | - Paolo Bernardi
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/B, 35121 Padua, Italy.
| | - Giovanna Lippe
- Department of Food Science, University of Udine, via Sondrio 2/A, 33100 Udine, Italy.
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HEJZLAROVÁ K, MRÁČEK T, VRBACKÝ M, KAPLANOVÁ V, KARBANOVÁ V, NŮSKOVÁ H, PECINA P, HOUŠTĚK J. Nuclear Genetic Defects of Mitochondrial ATP Synthase. Physiol Res 2014; 63:S57-71. [DOI: 10.33549/physiolres.932643] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Disorders of ATP synthase, the key enzyme of mitochondrial energy provision belong to the most severe metabolic diseases presenting as early-onset mitochondrial encephalo-cardiomyopathies. Up to now, mutations in four nuclear genes were associated with isolated deficiency of ATP synthase. Two of them, ATP5A1 and ATP5E encode enzyme’s structural subunits α and ε, respectively, while the other two ATPAF2 and TMEM70 encode specific ancillary factors that facilitate the biogenesis of ATP synthase. All these defects share a similar biochemical phenotype with pronounced decrease in the content of fully assembled and functional ATP synthase complex. However, substantial differences can be found in their frequency, molecular mechanism of pathogenesis, clinical manifestation as well as the course of the disease progression. While for TMEM70 the number of reported patients as well as spectrum of the mutations is steadily increasing, mutations in ATP5A1, ATP5E and ATPAF2 genes are very rare. Apparently, TMEM70 gene is highly prone to mutagenesis and this type of a rare mitochondrial disease has a rather frequent incidence. Here we present overview of individual reported cases of nuclear mutations in ATP synthase and discuss, how their analysis can improve our understanding of the enzyme biogenesis.
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Affiliation(s)
| | | | | | | | | | | | | | - J. HOUŠTĚK
- Department of Bioenergetics, Institute of Physiology Academy of Sciences of the Czech Republic, Prague, Czech Republic
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17
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Mourier A, Ruzzenente B, Brandt T, Kühlbrandt W, Larsson NG. Loss of LRPPRC causes ATP synthase deficiency. Hum Mol Genet 2014; 23:2580-92. [PMID: 24399447 PMCID: PMC3990160 DOI: 10.1093/hmg/ddt652] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Defects of the oxidative phosphorylation system, in particular of cytochrome-c oxidase (COX, respiratory chain complex IV), are common causes of Leigh syndrome (LS), which is a rare neurodegenerative disorder with severe progressive neurological symptoms that usually present during infancy or early childhood. The COX-deficient form of LS is commonly caused by mutations in genes encoding COX assembly factors, e.g. SURF1, SCO1, SCO2 or COX10. However, other mutations affecting genes that encode proteins not directly involved in COX assembly can also cause LS. The leucine-rich pentatricopeptide repeat containing protein (LRPPRC) regulates mRNA stability, polyadenylation and coordinates mitochondrial translation. In humans, mutations in Lrpprc cause the French Canadian type of LS. Despite the finding that LRPPRC deficiency affects the stability of most mitochondrial mRNAs, its pathophysiological effect has mainly been attributed to COX deficiency. Surprisingly, we show here that the impaired mitochondrial respiration and reduced ATP production observed in Lrpprc conditional knockout mouse hearts is caused by an ATP synthase deficiency. Furthermore, the appearance of inactive subassembled ATP synthase complexes causes hyperpolarization and increases mitochondrial reactive oxygen species production. Our findings shed important new light on the bioenergetic consequences of the loss of LRPPRC in cardiac mitochondria.
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Affiliation(s)
- Arnaud Mourier
- Department of Mitochondrial Biology, Max Planck Institute for Biology of Ageing, Joseph-Stelzmann-Strasse 9b, Cologne 50931, Germany and
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18
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Di Cara F, Duca E, Dunbar DR, Cagney G, Heck MMS. Invadolysin, a conserved lipid-droplet-associated metalloproteinase, is required for mitochondrial function in Drosophila. J Cell Sci 2013; 126:4769-81. [PMID: 23943867 PMCID: PMC3795342 DOI: 10.1242/jcs.133306] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/26/2013] [Indexed: 12/11/2022] Open
Abstract
Mitochondria are the main producers of ATP, the principal energy source of the cell, and reactive oxygen species (ROS), important signaling molecules. Mitochondrial morphogenesis and function depend on a hierarchical network of mechanisms in which proteases appear to be center stage. The invadolysin gene encodes an essential conserved metalloproteinase of the M8 family that is necessary for mitosis and cell migration during Drosophila development. We previously demonstrated that invadolysin is found associated with lipid droplets in cells. Here, we present data demonstrating that invadolysin interacts physically with three mitochondrial ATP synthase subunits. Our studies have focused on the genetic phenotypes of invadolysin and bellwether, the Drosophila homolog of ATP synthase α, mutants. The invadolysin mutation presents defects in mitochondrial physiology similar to those observed in bellwether mutants. The invadolysin and bellwether mutants have parallel phenotypes that affect lipid storage and mitochondrial electron transport chain activity, which result in a reduction in ATP production and an accumulation of ROS. As a consequence, invadolysin mutant larvae show lower energetic status and higher oxidative stress. Our data demonstrate an essential role for invadolysin in mitochondrial function that is crucial for normal development and survival.
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Affiliation(s)
- Francesca Di Cara
- University of Edinburgh, Queen's Medical Research Institute, BHF/University Center for Cardiovascular Science, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
| | - Edward Duca
- University of Edinburgh, Queen's Medical Research Institute, BHF/University Center for Cardiovascular Science, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
| | - Donald R. Dunbar
- University of Edinburgh, Queen's Medical Research Institute, BHF/University Center for Cardiovascular Science, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
| | - Gerard Cagney
- Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
| | - Margarete M. S. Heck
- University of Edinburgh, Queen's Medical Research Institute, BHF/University Center for Cardiovascular Science, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
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Liu ZH, Yu LP, Xu T, Zhang XW, Yuan YQ, Xiao YB, Li J, Hao YC, Zhao YP, Wang XF. Abnormal lipid metabolism down-regulates adenosine triphosphate synthase β-subunit protein expression in corpus cavernosum smooth musclein vitroandin vivo. Andrologia 2013; 46:487-94. [PMID: 23635034 DOI: 10.1111/and.12105] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/07/2013] [Indexed: 12/01/2022] Open
Affiliation(s)
- Z-H Liu
- Department of Urology, Peking University People's Hospital, Beijing, China
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20
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Compensatory upregulation of respiratory chain complexes III and IV in isolated deficiency of ATP synthase due to TMEM70 mutation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2012; 1817:1037-43. [DOI: 10.1016/j.bbabio.2012.03.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Revised: 03/04/2012] [Accepted: 03/05/2012] [Indexed: 11/15/2022]
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21
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Mitochondrial ('mild') uncoupling and ROS production: physiologically relevant or not? Biochem Soc Trans 2012; 39:1305-9. [PMID: 21936806 DOI: 10.1042/bst0391305] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
During the last decade, the possibility that 'mild' uncoupling could be protective against oxidative damage by diminishing ROS (reactive oxygen species) production has attracted much interest. In the present paper, we briefly examine the evidence for this possibility. It is only ROS production from succinate under reverse electron-flow conditions that is sensitive to membrane potential fluctuations, and so only this type of ROS production could be affected; however, the conditions under which succinate-supported ROS production is observed include succinate concentrations that are supraphysiological. Any decrease in membrane potential, even 'mild uncoupling', must necessarily lead to large increases in respiration, i.e. it must be markedly thermogenic. Mitochondria within cells are normally ATP-producing and thus already have a diminished membrane potential, and treatment of cells, organs or animals with small amounts of artificial uncoupler does not seem to have beneficial effects that are explainable via reduced ROS production. Although it has been suggested that members of the uncoupling protein family (UCP1, UCP2 and UCP3) may mediate a mild uncoupling, present evidence does not unequivocally support such an effect, e.g. the absence of the truly uncoupling protein UCP1 is not associated with increased oxidative damage. Thus present evidence does not support mild uncoupling as a physiologically relevant alleviator of oxidative damage.
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22
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Mayr JA, Havlícková V, Zimmermann F, Magler I, Kaplanová V, Jesina P, Pecinová A, Nusková H, Koch J, Sperl W, Houstek J. Mitochondrial ATP synthase deficiency due to a mutation in the ATP5E gene for the F1 epsilon subunit. Hum Mol Genet 2010; 19:3430-9. [PMID: 20566710 DOI: 10.1093/hmg/ddq254] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023] Open
Abstract
F1Fo-ATP synthase is a key enzyme of mitochondrial energy provision producing most of cellular ATP. So far, mitochondrial diseases caused by isolated disorders of the ATP synthase have been shown to result from mutations in mtDNA genes for the subunits ATP6 and ATP8 or in nuclear genes encoding the biogenesis factors TMEM70 and ATPAF2. Here, we describe a patient with a homozygous p.Tyr12Cys mutation in the epsilon subunit encoded by the nuclear gene ATP5E. The 22-year-old woman presented with neonatal onset, lactic acidosis, 3-methylglutaconic aciduria, mild mental retardation and developed peripheral neuropathy. Patient fibroblasts showed 60-70% decrease in both oligomycin-sensitive ATPase activity and mitochondrial ATP synthesis. The mitochondrial content of the ATP synthase complex was equally reduced, but its size was normal and it contained the mutated epsilon subunit. A similar reduction was found in all investigated F1 and Fo subunits with the exception of Fo subunit c, which was found to accumulate in a detergent-insoluble form. This is the first case of a mitochondrial disease due to a mutation in a nuclear encoded structural subunit of the ATP synthase. Our results indicate an essential role of the epsilon subunit in the biosynthesis and assembly of the F1 part of the ATP synthase. Furthermore, the epsilon subunit seems to be involved in the incorporation of subunit c to the rotor structure of the mammalian enzyme.
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Affiliation(s)
- Johannes A Mayr
- Department of Pediatrics, Paracelsus Medical University, Salzburg A5020, Austria
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23
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Jonckheere AI, Huigsloot M, Janssen AJM, Kappen AJH, Smeitink JAM, Rodenburg RJT. High-Throughput Assay to Measure Oxygen Consumption in Digitonin-Permeabilized Cells of Patients with Mitochondrial Disorders. Clin Chem 2010; 56:424-31. [DOI: 10.1373/clinchem.2009.131441] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Abstract
Background: Muscle biopsy analysis is regarded as the gold standard in diagnostic workups of patients with suspected mitochondrial disorders. Analysis of cultured fibroblasts can provide important additional diagnostic information. The measurement of individual OXPHOS complexes does not always provide sufficient information about the functional state of the complete mitochondrial energy-generating system. Thus, we optimized a high-throughput fluorescence-based methodology for oxygen consumption analysis in patient-derived cells.
Methods: We analyzed mitochondrial respiration in digitonin-permeabilized cells in the presence of a substrate mix containing pyruvate and malate, using a phosphorescent probe, 96-well plates, and a fluorescence plate reader.
Results: In control fibroblasts, we observed clear stimulation by ADP of the pyruvate + malate–driven respiration. Known inhibitors of the OXPHOS system and the Krebs cycle significantly reduced respiration. In patient fibroblasts with different OXPHOS deficiencies, ADP-stimulated respiratory activity was decreased in comparison to control cells. In several patients with reduced ATP production rate in muscle tissue but with normal OXPHOS enzyme activities, the fibroblasts displayed reduced respiratory activity. Finally, we observed a clear difference between control and complex I–deficient transmitochondrial cybrid cells.
Conclusions: These results confirm the validity of the assay as a high-throughput screening method for mitochondrial function in digitonin-permeabilized cells. The assay allows primary and secondary mitochondrial abnormalities in muscle to be differentiated, which is of great importance with respect to counseling, and also will facilitate the search for new genetic defects that lead to mitochondrial disease.
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Affiliation(s)
- An I Jonckheere
- Laboratory of Pediatrics and Neurology, Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, the Netherlands
| | - Merei Huigsloot
- Laboratory of Pediatrics and Neurology, Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, the Netherlands
| | - Antoon JM Janssen
- Laboratory of Pediatrics and Neurology, Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, the Netherlands
| | - Antonia JH Kappen
- Laboratory of Pediatrics and Neurology, Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, the Netherlands
| | - Jan AM Smeitink
- Laboratory of Pediatrics and Neurology, Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, the Netherlands
| | - Richard JT Rodenburg
- Laboratory of Pediatrics and Neurology, Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen, the Netherlands
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TMEM70 protein — A novel ancillary factor of mammalian ATP synthase. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2009; 1787:529-32. [DOI: 10.1016/j.bbabio.2008.11.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2008] [Revised: 11/21/2008] [Accepted: 11/26/2008] [Indexed: 11/18/2022]
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25
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Menzies KJ, Robinson BH, Hood DA. Effect of thyroid hormone on mitochondrial properties and oxidative stress in cells from patients with mtDNA defects. Am J Physiol Cell Physiol 2008; 296:C355-62. [PMID: 19036942 DOI: 10.1152/ajpcell.00415.2007] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mitochondrial (mt)DNA mutations contribute to various disease states characterized by low ATP production. In contrast, thyroid hormone [3,3',5-triiodothyronine (T(3))] induces mitochondrial biogenesis and enhances ATP generation within cells. To evaluate the role of T(3)-mediated mitochondrial biogenesis in patients with mtDNA mutations, three fibroblast cell lines with mtDNA mutations were evaluated, including two patients with Leigh's syndrome and one with hypertrophic cardiomyopathy. Compared with control cells, patient fibroblasts displayed similar levels of mitochondrial mass, peroxisome proliferator-activated receptor-gamma coactivator-1alpha (PGC-1alpha), mitochondrial transcription factor A (Tfam), and uncoupling protein 2 (UCP2) protein expression. However, patient cells exhibited a 1.6-fold elevation in ROS production, a 1.7-fold elevation in cytoplasmic Ca2+ levels, a 1.2-fold elevation in mitochondrial membrane potential, and 30% less complex V activity compared with control cells. Patient cells also displayed 20-25% reductions in both cytochrome c oxidase (COX) activity and MnSOD protein levels compared with control cells. After T(3) treatment of patient cells, ROS production was decreased by 40%, cytoplasmic Ca2+ was reduced by 20%, COX activity was increased by 1.3-fold, and ATP levels were elevated by 1.6-fold, despite the absence of a change in mitochondrial mass. There were no significant alterations in the protein expression of PGC-1alpha, Tfam, or UCP2 in either T(3)-treated patient or control cells. However, T(3) restored the mitochondrial membrane potential, complex V activity, and levels of MnSOD to normal values in patient cells and elevated MnSOD levels by 21% in control cells. These results suggest that T(3) acts to reduce cellular oxidative stress, which may help attenuate ROS-mediated damage, along with improving mitochondrial function and energy status in cells with mtDNA defects.
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Affiliation(s)
- Keir J Menzies
- School of Kinesiology and Health Science, Farqhuarson Life Science Bldg., Rm. 302, York Univ., Toronto, ON M3JIP3, Canada
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Baracca A, Sgarbi G, Mattiazzi M, Casalena G, Pagnotta E, Valentino ML, Moggio M, Lenaz G, Carelli V, Solaini G. Biochemical phenotypes associated with the mitochondrial ATP6 gene mutations at nt8993. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2007; 1767:913-9. [PMID: 17568559 DOI: 10.1016/j.bbabio.2007.05.005] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2006] [Revised: 05/07/2007] [Accepted: 05/11/2007] [Indexed: 01/09/2023]
Abstract
Two point mutations (T>G and T>C) at the same 8993 nucleotide of mitochondrial DNA (at comparable mutant load), affecting the ATPase 6 subunit of the F1F0-ATPase, result in neurological phenotypes of variable severity in humans. We have investigated mitochondrial function in lymphocytes from individuals carrying the 8993T>C mutation: the results were compared with data from five 8993T>G NARP (Neuropathy, Ataxia and Retinitis Pigmentosa) patients. Both 8993T>G and 8993T>C mutations led to energy deprivation and ROS overproduction. However, the relative contribution of the two pathogenic components is different depending on the mutation considered. The 8993T>G change mainly induces an energy deficiency, whereas the 8993T>C favours an increased ROS production. These results possibly highlight the different pathogenic mechanism generated by the two mutations at position 8993 and provide useful information to better characterize the biochemical role of the highly conserved Leu-156 in ATPase 6 subunit of the mitochondrial ATP synthase complex.
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Affiliation(s)
- Alessandra Baracca
- Dipartimento di Biochimica G. Moruzzi, via Irnerio 48, Università di Bologna, 40126 Bologna, and Fondazione Ospedale Maggiore IRCCS-Centro Dino Ferrari, Milano, Italy
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27
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Sperl W, Jesina P, Zeman J, Mayr JA, Demeirleir L, VanCoster R, Pícková A, Hansíková H, Houst'ková H, Krejcík Z, Koch J, Smet J, Muss W, Holme E, Houstek J. Deficiency of mitochondrial ATP synthase of nuclear genetic origin. Neuromuscul Disord 2006; 16:821-9. [PMID: 17052906 DOI: 10.1016/j.nmd.2006.08.008] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2006] [Revised: 06/28/2006] [Accepted: 08/03/2006] [Indexed: 11/18/2022]
Abstract
We present clinical and laboratory data from 14 cases with an isolated deficiency of the mitochondrial ATP synthase (7-30% of control) caused by nuclear genetic defects. A quantitative decrease of the ATP synthase complex was documented by Blue-Native electrophoresis and Western blotting and was supported by the diminished activity of oligomycin/aurovertin-sensitive ATP hydrolysis in fibroblasts (10 cases), muscle (6 of 7 cases), and liver (one case). All patients had neonatal onset and elevated plasma lactate levels. In 12 patients investigated 3-methyl-glutaconic aciduria was detected. Seven patients died, mostly within the first weeks of life and surviving patients showed psychomotor and various degrees of mental retardation. Eleven patients had hypertrophic cardiomyopathy; other clinical signs included hypotonia, hepatomegaly, facial dysmorphism and microcephaly. This phenotype markedly differs from the severe central nervous system changes of ATP synthase disorders caused by mitochondrial DNA mutations of the ATP6 gene presenting mostly as NARP and MILS.
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Affiliation(s)
- W Sperl
- Department of Pediatrics, Paracelsus Private Medical University, Salzburg, Austria
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Labajova A, Vojtiskova A, Krivakova P, Kofranek J, Drahota Z, Houstek J. Evaluation of mitochondrial membrane potential using a computerized device with a tetraphenylphosphonium-selective electrode. Anal Biochem 2006; 353:37-42. [PMID: 16643832 DOI: 10.1016/j.ab.2006.03.032] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2005] [Revised: 02/13/2006] [Accepted: 03/17/2006] [Indexed: 11/22/2022]
Abstract
Mitochondrial membrane potential (Deltapsi(m)) plays important roles in the normal function of cells and in pathobiochemical situations. The application of ion-selective electrodes for the measurement of Deltapsi(m) is important for studying normal biological reactions and pathways and mitochondrial diseases. We constructed and optimized a computerized device for real-time monitoring of the Deltapsi(m), which included modification of tetraphenylphosphonium (TPP(+))-selective membrane that improved reproducibility of the TPP(+)-selective electrode. Application of MATLAB software increased the sensitivity of the system. We tested our improved device for membrane potential measurements of isolated mitochondria (in absolute scale of millivolts). In addition, we assessed relative changes of Deltapsi(m) (as changes in TPP(+) concentration) of digitonin-permeabilized cells (hepatocytes, control transmitochondrial cybrids, HeLa G and BSC-40) after addition of substrates, inhibitors, and uncoupler of respiratory chain. Our system can be successfully used for studies of many aspects of the regulation of mitochondrial bioenergetics and as a diagnostic tool for mitochondrial oxidative phosphorylation disorders.
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Affiliation(s)
- Anna Labajova
- Institute of Pathophysiology, 1st Faculty of Medicine, Charles University, Prague, Czech Republic.
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