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Yang J, Griffin A, Qiang Z, Ren J. Organelle-targeted therapies: a comprehensive review on system design for enabling precision oncology. Signal Transduct Target Ther 2022; 7:379. [PMID: 36402753 PMCID: PMC9675787 DOI: 10.1038/s41392-022-01243-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 10/19/2022] [Accepted: 10/25/2022] [Indexed: 11/21/2022] Open
Abstract
Cancer is a major threat to human health. Among various treatment methods, precision therapy has received significant attention since the inception, due to its ability to efficiently inhibit tumor growth, while curtailing common shortcomings from conventional cancer treatment, leading towards enhanced survival rates. Particularly, organelle-targeted strategies enable precise accumulation of therapeutic agents in organelles, locally triggering organelle-mediated cell death signals which can greatly reduce the therapeutic threshold dosage and minimize side-effects. In this review, we comprehensively discuss history and recent advances in targeted therapies on organelles, specifically including nucleus, mitochondria, lysosomes and endoplasmic reticulum, while focusing on organelle structures, organelle-mediated cell death signal pathways, and design guidelines of organelle-targeted nanomedicines based on intervention mechanisms. Furthermore, a perspective on future research and clinical opportunities and potential challenges in precision oncology is presented. Through demonstrating recent developments in organelle-targeted therapies, we believe this article can further stimulate broader interests in multidisciplinary research and technology development for enabling advanced organelle-targeted nanomedicines and their corresponding clinic translations.
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Affiliation(s)
- Jingjing Yang
- grid.24516.340000000123704535Institute of Nano and Biopolymeric Materials, School of Materials Science and Engineering, Tongji University, 201804 Shanghai, China
| | - Anthony Griffin
- grid.267193.80000 0001 2295 628XSchool of Polymer Science and Engineering, University of Southern Mississippi, Hattiesburg, MS 39406 USA
| | - Zhe Qiang
- grid.267193.80000 0001 2295 628XSchool of Polymer Science and Engineering, University of Southern Mississippi, Hattiesburg, MS 39406 USA
| | - Jie Ren
- grid.24516.340000000123704535Institute of Nano and Biopolymeric Materials, School of Materials Science and Engineering, Tongji University, 201804 Shanghai, China
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Mensah EA, Sarfo B, Yawson AE, Arthur J, Ocloo A. Knowledge and awareness of mitochondrial diseases among physicians in the tertiary hospitals in Ghana. PLoS One 2022; 17:e0276549. [PMID: 36264964 PMCID: PMC9584519 DOI: 10.1371/journal.pone.0276549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 10/08/2022] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Mitochondrial diseases/disorders (MDs), for decades, have been identified as a key underlying condition for many chronic diseases globally. However, data on the knowledge and prevalence of MDs in many countries in sub-Saharan Africa are lacking. This study assessed the knowledge, and awareness, of MDs among senior medical doctors in the five tertiary hospitals in Ghana. METHOD Data were collected from one hundred and twenty-eight (128) medical doctors in the five Tertiary Hospitals in Ghana using both closed and open-ended questionnaires and analysed using descriptive statistics. RESULTS Of the 128 respondents, 70.32% were senior medical officers and above, 87% of them indicated that they were aware of MDs and over 90% said physicians do not often diagnose MDs in Ghana. About 81% indicated that MDs are associated with chronic illnesses whilst 72% said the disease is diagnosed in both males and females. About 45% of the respondents alluded to the fact that MDs are difficult to diagnose, are associated with mutations in both the mitochondrial and the nuclear DNA, and are non-infectious diseases. Approximately 85% said nervous system dysfunction and muscle weakness are some of the symptoms associated with MDs whilst 77% said fatigue is also one of the symptoms. About 38% of the respondents specified that they encounter myopathies. A majority (70%) did not know about the availability of any consensus or standard diagnostic procedure and/or drugs for MDs. CONCLUSION There is a high level of knowledge and awareness of MDs among the respondents. However, there is a low disease encounter, which could be due to a lack of diagnostic protocols or a low disease prevalence. It is, therefore recommend that a patient perspective study, which looks at clinical records and laboratory data be conducted to fully ascertain the prevalence of MDs in Ghana and that appropriate educational strategies and interventions aimed at improving the diagnosis of mitochondrial diseases in Ghana be put in place.
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Affiliation(s)
- Eric A. Mensah
- Department of Biochemistry, Cell & Molecular Biology, School of Biological Sciences, College of Basic and Applied Sciences, University of Ghana, Legon, Accra, Ghana
- West African Centre for the Cell Biology of Infectious Pathogens, University of Ghana, Legon, Accra, Ghana
| | - Bismark Sarfo
- Department of Epidemiology and Disease Control, School of Public Health, College of Health Sciences, University of Ghana, Legon, Accra, Ghana
| | - Alfred E. Yawson
- Department of Community Health, University of Ghana Medical School, College of Health Sciences, University of Ghana Korle Bu, Accra, Ghana
| | - Joshua Arthur
- Public Health Unit, Komfo Anokye Teaching Hospital, Kumasi, Ghana
| | - Augustine Ocloo
- Department of Biochemistry, Cell & Molecular Biology, School of Biological Sciences, College of Basic and Applied Sciences, University of Ghana, Legon, Accra, Ghana
- * E-mail:
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Evaluation of 6-Hydroxydopamine and Rotenone In Vitro Neurotoxicity on Differentiated SH-SY5Y Cells Using Applied Computational Statistics. Int J Mol Sci 2022; 23:ijms23063009. [PMID: 35328430 PMCID: PMC8953223 DOI: 10.3390/ijms23063009] [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: 02/10/2022] [Revised: 03/04/2022] [Accepted: 03/07/2022] [Indexed: 11/22/2022] Open
Abstract
With the increase in life expectancy and consequent aging of the world’s population, the prevalence of many neurodegenerative diseases is increasing, without concomitant improvement in diagnostics and therapeutics. These diseases share neuropathological hallmarks, including mitochondrial dysfunction. In fact, as mitochondrial alterations appear prior to neuronal cell death at an early phase of a disease’s onset, the study and modulation of mitochondrial alterations have emerged as promising strategies to predict and prevent neurotoxicity and neuronal cell death before the onset of cell viability alterations. In this work, differentiated SH-SY5Y cells were treated with the mitochondrial-targeted neurotoxicants 6-hydroxydopamine and rotenone. These compounds were used at different concentrations and for different time points to understand the similarities and differences in their mechanisms of action. To accomplish this, data on mitochondrial parameters were acquired and analyzed using unsupervised (hierarchical clustering) and supervised (decision tree) machine learning methods. Both biochemical and computational analyses resulted in an evident distinction between the neurotoxic effects of 6-hydroxydopamine and rotenone, specifically for the highest concentrations of both compounds.
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Ivanova DG, Yaneva ZL. Antioxidant Properties and Redox-Modulating Activity of Chitosan and Its Derivatives: Biomaterials with Application in Cancer Therapy. Biores Open Access 2020; 9:64-72. [PMID: 32219012 PMCID: PMC7097683 DOI: 10.1089/biores.2019.0028] [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] [Indexed: 02/06/2023] Open
Abstract
Many studies have shown that mitochondrial metabolism has a fundamental role in induction of carcinogenesis due to the influence of increased levels of reactive oxygen species (ROS) generation in all steps of oncogene transformation and cancer progression. It is widely accepted that the anticancer effect of conventional anticancer drugs is due to induction of oxidative stress and elevated intracellular levels of ROS, which alter the redox homeostasis of cancer cells. On the other hand, the harmful side effects of conventional anticancer chemotherapeutics are also due to increased production of ROS and disruption of redox homeostasis of normal cells and tissues. Therefore, there is a growing interest toward the development of natural antioxidant compounds from various sources, which could impact the redox state of cancer and normal cells by different pathways and could prevent damage from oxidant-mediated reactions. It is known that chitosan exhibits versatile biological properties, including biodegradability, biocompatibility, and a less toxic nature. Because of its antioxidant, antibacterial, anticancer, anti-inflammatory, and immunostimulatory activities, the biopolymer has been used in a wide variety of pharmaceutical, biomedical, food industry, health, and agricultural applications and has been classified as a new physiologically bioactive material.
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Affiliation(s)
- Donika G. Ivanova
- Department of Pharmacology, Animal Physiology and Physiology Chemistry, Trakia University, Stara Zagora, Bulgaria
| | - Zvezdelina L. Yaneva
- Department of Pharmacology, Animal Physiology and Physiology Chemistry, Trakia University, Stara Zagora, Bulgaria
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Yao X, Zhang F, Qiao Z, Yu H, Sun S, Li X, Zhang J, Jiang X. Toxicity of thifluzamide in earthworm (Eisenia fetida). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 188:109880. [PMID: 31711777 DOI: 10.1016/j.ecoenv.2019.109880] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 10/17/2019] [Accepted: 10/25/2019] [Indexed: 06/10/2023]
Abstract
An increase in the area treated with the fungicide thifluzamide has triggered concerns for soil ecosystem service providers such as earthworms. Here, we assessed effects of thifluzamide on earthworm (Eisenia fetida) biomarker indicators of stress responses and reproduction following exposure to 0, 0.1, 1.0, and 10.0 mg of thifluzamide kg-1 soil for 7, 14, 21, and 28 d (biomarker indicators) and 30 d (reproduction). Growth and reproduction were inhibited by exposure to thifluzamide at 10.0 mg/kg, and the activities of succinate dehydrogenase (SDH) and respiratory chain complex II were inhibited by exposure to 1.0 and 10.0 mg/kg thifluzamide for the majority of the 28-d experiment. Reactive oxygen species (ROS) increased across all thifluzamide treatments, and the activities of superoxide dismutase (SOD) and glutathione-S-transferase (GST) tended to be inhibited by thifluzamide. Upon exposure to thifluzamide, the activities of catalase (CAT) and guaiacol peroxidase (POD) initially increased and then decreased. Increased levels of malondialdehyde (MDA) were detected only at seven days after exposure, and genotoxicity increased as the thifluzamide concentration increased. The results suggest that thifluzamide presents a potential risk to earthworms at the concentration of 10.0 mg/kg, and its use should be moderated to reduce damage to soil ecosystem function.
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Affiliation(s)
- Xiangfeng Yao
- College of Plant Protection Shandong Agricultural University, Tai'an, Shandong, 271018, PR China; Key Laboratory of Pesticide Toxicology & Application Technique, Tai'an, Shandong, 271018, PR China
| | - Fengwen Zhang
- College of Plant Protection Shandong Agricultural University, Tai'an, Shandong, 271018, PR China; Key Laboratory of Pesticide Toxicology & Application Technique, Tai'an, Shandong, 271018, PR China
| | - Zhihua Qiao
- College of Plant Protection Shandong Agricultural University, Tai'an, Shandong, 271018, PR China; Key Laboratory of Pesticide Toxicology & Application Technique, Tai'an, Shandong, 271018, PR China
| | - Haoyong Yu
- College of Plant Protection Shandong Agricultural University, Tai'an, Shandong, 271018, PR China; Key Laboratory of Pesticide Toxicology & Application Technique, Tai'an, Shandong, 271018, PR China
| | - Shiang Sun
- College of Plant Protection Shandong Agricultural University, Tai'an, Shandong, 271018, PR China; Key Laboratory of Pesticide Toxicology & Application Technique, Tai'an, Shandong, 271018, PR China
| | - Xiangdong Li
- College of Plant Protection Shandong Agricultural University, Tai'an, Shandong, 271018, PR China
| | - Jiwang Zhang
- State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Tai'an, Shandong, 271018, PR China
| | - Xingyin Jiang
- College of Plant Protection Shandong Agricultural University, Tai'an, Shandong, 271018, PR China; Key Laboratory of Pesticide Toxicology & Application Technique, Tai'an, Shandong, 271018, PR China.
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Yang Y, Liu W, Mu X, Qi S, Fu B, Wang C. Biological response of zebrafish embryos after short-term exposure to thifluzamide. Sci Rep 2016; 6:38485. [PMID: 27924917 PMCID: PMC5141451 DOI: 10.1038/srep38485] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 11/10/2016] [Indexed: 12/13/2022] Open
Abstract
Thifluzamide is a new amide fungicide, and its extensive application may have toxic effects on zebrafish. To better understand the underlying mechanism, we investigated in detail the potential toxic effects of thifluzamide on zebrafish embryos. In the present study, embryos were exposed to 0, 0.19, 1.90, and 2.85 mg/L thifluzamide for 4 days. Obvious pathological changes were found upon a histological exam, and negative changes in mitochondrial structure were observed under Transmission Electron Microscopy (TEM), which qualitatively noted the toxic effects of thifluzamide on embryos. Moreover, we quantitatively evaluated the enzyme activities [succinate dehydrogenase (SDH), superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), caspases], the contents of malonaldehyde (MDA) and interleukin-8 (IL-8) and the expression levels of the related genes. This study suggests that the negative changes in mitochondrial structure and SDH activity might be responsible for oxidative damage, cell apoptosis and inflammation, which would facilitate the action of these factors in cell death and might play a crucial role during toxic events. In addition to providing the first description of the mechanism of the toxic effects of thifluzamide on embryos, this study also represents a step towards using embryos to assess mitochondrial metabolism and disease.
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Affiliation(s)
- Yang Yang
- College of Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Wenxian Liu
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, People's Republic of China
| | - Xiyan Mu
- Center of Fishery Resources and Ecology Environment Research, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Suzhen Qi
- College of Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Bin Fu
- College of Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Chengju Wang
- College of Sciences, China Agricultural University, Beijing, People's Republic of China
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Ivanova D, Zhelev Z, Aoki I, Bakalova R, Higashi T. Overproduction of reactive oxygen species - obligatory or not for induction of apoptosis by anticancer drugs. Chin J Cancer Res 2016; 28:383-96. [PMID: 27647966 PMCID: PMC5018533 DOI: 10.21147/j.issn.1000-9604.2016.04.01] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Many studies demonstrate that conventional anticancer drugs elevate intracellular level of reactive oxygen species (ROS) and alter redox-homeostasis of cancer cells. It is widely accepted that anticancer effect of these chemotherapeutics is due to induction of oxidative stress and ROS-mediated apoptosis in cancer. On the other hand, the harmful side effects of conventional anticancer chemotherapy are also due to increased production of ROS and disruption of redox-homeostasis of normal cells and tissues. This article describes the mechanisms for triggering and modulation of apoptosis through ROS-dependent and ROS-independent pathways. We try to answer the question: "Is it possible to induce highly specific apoptosis only in cancer cells, without overproduction of ROS, as well as without harmful effects on normal cells and tissues?" The review also suggests a new therapeutic strategy for selective killing of cancer cells, without significant impact on viability of normal cells and tissues, by combining anticancer drugs with redox-modulators, affecting specific signaling pathways and avoiding oxidative stress.
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Affiliation(s)
- Donika Ivanova
- Medical Faculty, Trakia University, Stara Zagora 6000, Bulgaria
| | - Zhivko Zhelev
- Medical Faculty, Trakia University, Stara Zagora 6000, Bulgaria; Institute of Biophysics & Biomedical Engineering, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
| | - Ichio Aoki
- Department of Molecular Imaging and Theranostics, National Institute of Radiological Sciences, National Institute for Quantum and Radiological Science and Technology, Chiba 263-8555, Japan
| | - Rumiana Bakalova
- Department of Molecular Imaging and Theranostics, National Institute of Radiological Sciences, National Institute for Quantum and Radiological Science and Technology, Chiba 263-8555, Japan; Medical Faculty, Sofia University, Sofia 1407, Bulgaria
| | - Tatsuya Higashi
- Department of Molecular Imaging and Theranostics, National Institute of Radiological Sciences, National Institute for Quantum and Radiological Science and Technology, Chiba 263-8555, Japan
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Ortega-Alonso A, Stephens C, Lucena MI, Andrade RJ. Case Characterization, Clinical Features and Risk Factors in Drug-Induced Liver Injury. Int J Mol Sci 2016; 17:E714. [PMID: 27187363 PMCID: PMC4881536 DOI: 10.3390/ijms17050714] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Revised: 04/26/2016] [Accepted: 05/05/2016] [Indexed: 02/08/2023] Open
Abstract
Idiosyncratic drug-induced liver injury (DILI) caused by xenobiotics (drugs, herbals and dietary supplements) presents with a range of both phenotypes and severity, from acute hepatitis indistinguishable of viral hepatitis to autoimmune syndromes, steatosis or rare chronic vascular syndromes, and from asymptomatic liver test abnormalities to acute liver failure. DILI pathogenesis is complex, depending on the interaction of drug physicochemical properties and host factors. The awareness of risk factors for DILI is arising from the analysis of large databases of DILI cases included in Registries and Consortia networks around the world. These networks are also enabling in-depth phenotyping with the identification of predictors for severe outcome, including acute liver failure and mortality/liver transplantation. Genome wide association studies taking advantage of these large cohorts have identified several alleles from the major histocompatibility complex system indicating a fundamental role of the adaptive immune system in DILI pathogenesis. Correct case definition and characterization is crucial for appropriate phenotyping, which in turn will strengthen sample collection for genotypic and future biomarkers studies.
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Affiliation(s)
- Aida Ortega-Alonso
- Unidad de Gestión Clínica de Enfermedades Digestivas y Farmacología Clínica, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Universitario Virgen de la Victoria, Universidad de Málaga, 29071 Málaga, Spain.
| | - Camilla Stephens
- Unidad de Gestión Clínica de Enfermedades Digestivas y Farmacología Clínica, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Universitario Virgen de la Victoria, Universidad de Málaga, 29071 Málaga, Spain.
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), 28029 Madrid, Spain.
| | - M Isabel Lucena
- Unidad de Gestión Clínica de Enfermedades Digestivas y Farmacología Clínica, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Universitario Virgen de la Victoria, Universidad de Málaga, 29071 Málaga, Spain.
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), 28029 Madrid, Spain.
| | - Raúl J Andrade
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), 28029 Madrid, Spain.
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Han J, Lee TH, Tung CH, Lee DY. Design and synthesis of a mitochondria-targeting carrier for small molecule drugs. Org Biomol Chem 2015; 12:9793-6. [PMID: 25378226 DOI: 10.1039/c4ob01981d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A novel mitochondria-targeting carrier QCy7HA was developed. QCy7HA transported the covalently attached doxorubicin (DOX) to mitochondria specifically. The conjugate limited the effects of P-glycoprotein (Pgp) efflux pumps of multidrug-resistant cells on DOX, indicating that diverting drugs to mitochondria is a potential promising method for treatment of drug-resistant cancers.
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Affiliation(s)
- Junyan Han
- Department of Translational Imaging, Houston Methodist Research Institute, Weill Cornell Medical College, Houston, TX 77030, USA
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Truong HT, Nguyen VAT, Nguyen LV, Pham VA, Phan TN. Screening of common point-mutations and discovery of new T14727C change in mitochondrial genome of Vietnamese encephalomyopathy patients. Mitochondrial DNA A DNA Mapp Seq Anal 2014; 27:441-8. [PMID: 24708131 DOI: 10.3109/19401736.2014.900665] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Vietnamese patients (106) tentatively diagnosed with encephalomyopathy were screened for the presence of 15 common point mutations in mitochondria using PCR-RFLP. The screened mutations include A3243G, T3271C and T3291C for Mitochondrial Encephalopathy, Lactic Acidosis and Stroke-like episodes (MELAS); A8344G and T8356C for Myoclonus Epilepsy and Rag-Red Fibers (MERRF); G11778A, G3460A and T14484C for Leber's Hereditary Optic Neuropathy (LHON); T8993G/C and T9176G for Leigh syndrome; A1555G for deafness syndrome; G4298A, T10010C, T14728C and T14709C for neuromuscular syndrome. As a result, 6 cases of A3243G (5.7%) and 2 cases of T14727C (3.9%) were found. The 6 cases of A3243G mutation were heteroplasmic at different levels (4.23-80.85%). The T14727C change was discovered for the first time in the MTTE gene encoding for tRNA(Glu) and showed homoplasmy. The T14727C change was probably a mutation because it was further confirmed as vertically inherited from the mother and not the result of isolated polymorphism.
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Affiliation(s)
- Hue Thi Truong
- a Key Laboratory of Enzyme and Protein Technology , VNU University of Science , Hanoi , Vietnam
| | - Van-Anh Thi Nguyen
- a Key Laboratory of Enzyme and Protein Technology , VNU University of Science , Hanoi , Vietnam
| | - Lieu Van Nguyen
- b Department of Neurology , Bach Mai Hospital , Hanoi , Vietnam , and
| | - Van-Anh Pham
- c National Hospital for Pediatrics , Dongda , Hanoi , Vietnam
| | - Tuan-Nghia Phan
- a Key Laboratory of Enzyme and Protein Technology , VNU University of Science , Hanoi , Vietnam
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Multilevel functional and structural defects induced by two pathogenic mitochondrial tRNA mutations. Biochem J 2013; 453:455-65. [PMID: 23631826 DOI: 10.1042/bj20130294] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Point mutations in hmtRNAs (human mitochondrial tRNAs) can cause various disorders, such as CPEO (chronic progressive external ophthalmoplegia) and MM (mitochondrial myopathy). Mitochondrial tRNALeu, especially the UUR codon isoacceptor, is recognized as a hot spot for pathogenic mtDNA point mutations. Thus far, 40 mutations have been reported in hmtRNAsLeu. In the present paper, we describe the wide range of effects of two substitutions found in the TΨC arms of two hmtRNAsLeu isoacceptors. The G52A substitution, corresponding to the pathogenic G12315A mutation in tRNALeu(CUN), and G3283A in tRNALeu(UUR) exhibited structural changes in the outer corner of the tRNA shape as shown by RNase probing. These mutations also induced reductions in aminoacylation, 3'-end processing and base modification processes. The main effects of the A57G substitution, corresponding to mutations A12320G in tRNALeu(CUN) and A3288G in tRNALeu(UUR), were observed on the aminoacylation activity and binding to hmEF-Tu (human mitochondrial elongation factor Tu). These observations suggest that the wide range of effects may amplify the deleterious impact on mitochondrial protein synthesis in vivo. The findings also emphasize that an exact understanding of tRNA dysfunction is critical for the future development of therapies for mitochondrial diseases.
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Emmanuele V, Silvers DS, Sotiriou E, Tanji K, DiMauro S, Hirano M. MERRF and Kearns-Sayre overlap syndrome due to the mitochondrial DNA m.3291T>C mutation. Muscle Nerve 2012; 44:448-51. [PMID: 21996807 DOI: 10.1002/mus.22149] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A 48-year-old man presented with a complex phenotype of myoclonus epilepsy with ragged-red fibers (MERRF) syndrome and Kearns-Sayre syndrome (KSS), which included progressive myoclonus epilepsy, cerebellar ataxia, hearing loss, myopathic weakness, ophthalmoparesis, pigmentary retinopathy, bifascicular heart block, and ragged-red fibers. The m.3291T>C mutation in the tRNA(Leu(UUR)) gene was found with 92% heteroplasmy in muscle. This mutation has been reported with MELAS, myopathy, and deafness with cognitive impairment. This is the first description with a MERRF/KSS syndrome.
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Affiliation(s)
- Valentina Emmanuele
- Department of Neurology, Columbia University Medical Center, 630 West 168th Street, P&S 4-423, New York, New York 10032, USA
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Apostolova N, Blas-García A, Esplugues JV. Mitochondrial interference by anti-HIV drugs: mechanisms beyond Pol-γ inhibition. Trends Pharmacol Sci 2011; 32:715-25. [PMID: 21899897 DOI: 10.1016/j.tips.2011.07.007] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 07/27/2011] [Accepted: 07/29/2011] [Indexed: 02/06/2023]
Abstract
The combined pharmacological approach to the treatment of HIV infection, known as highly active antiretroviral therapy (HAART), has dramatically reduced AIDS-related morbidity and mortality. However, its use has been associated with serious adverse reactions, of which those resulting from mitochondrial dysfunction are particularly widespread. Nucleos(t)ide-reverse transcriptase inhibitors (NRTIs) have long been considered the main source of HAART-related mitochondrial toxicity due to their ability to inhibit Pol-γ, the DNA polymerase responsible for the synthesis of mitochondrial DNA. Nevertheless, accumulating evidence points to a more complex relationship between these organelles and NRTIs. Also, alternative pathways by which other groups of anti-HIV drugs (non-nucleoside reverse transcriptase inhibitors and protease inhibitors) interfere with mitochondria have been suggested, although their implications, both pharmacological and clinical, are open to debate. This review aims to provide a comprehensive overview of the mechanisms and factors which influence the mitochondrial involvement in the toxicity of all three major classes of anti-HIV drugs.
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Affiliation(s)
- Nadezda Apostolova
- Departamento de Farmacología, Facultad de Medicina, Universidad de Valencia, Avda Blasco Ibáñez n.15-17, 46010 Valencia, Spain
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Cationic amphiphilic polyproline helix P11LRR targets intracellular mitochondria. J Control Release 2010; 142:259-66. [DOI: 10.1016/j.jconrel.2009.10.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2009] [Revised: 10/05/2009] [Accepted: 10/09/2009] [Indexed: 12/26/2022]
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Todorov IN, Todorov GI. Multifactorial nature of high frequency of mitochondrial DNA mutations in somatic mammalian cells. BIOCHEMISTRY (MOSCOW) 2009; 74:962-70. [DOI: 10.1134/s000629790909003x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Sotiriou E, Coku J, Tanji K, Huang HB, Hirano M, DiMauro S. The m.3244G>A mutation in mtDNA is another cause of progressive external ophthalmoplegia. Neuromuscul Disord 2009; 19:297-9. [PMID: 19285865 DOI: 10.1016/j.nmd.2009.01.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2008] [Accepted: 01/30/2009] [Indexed: 11/29/2022]
Abstract
We sequenced all mitochondrial tRNA genes in a 61-year-old man with chronic progressive external ophthalmoplegia and mitochondrial myopathy but without mtDNA rearrangements, and identified a heteroplasmic m.3244G>A mutation in the tRNA(Leu(UUR)) gene. This mutation had been previously associated with the MELAS phenotype, but not described in any detail. The mutation load in muscle was 84% and COX-negative fibers harbored greater levels of mutant genomes than COX-positive fibers. The m.3244G>A mutation affects a highly conserved nucleotide in the dihydrouridine loop and has been associated with a wobble modification deficiency of the mutant tRNA.
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Affiliation(s)
- Evangelia Sotiriou
- Department of Neurology, Columbia University Medical Center, New York, NY 10032, USA
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17
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Cardaioli E, Da Pozzo P, Malfatti E, Gallus G, Rubegni A, Malandrini A, Gaudiano C, Guidi L, Serni G, Berti G, Dotti M, Federico A. Chronic progressive external ophthalmoplegia: A new heteroplasmic tRNALeu(CUN) mutation of mitochondrial DNA. J Neurol Sci 2008; 272:106-9. [DOI: 10.1016/j.jns.2008.05.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2007] [Revised: 05/05/2008] [Accepted: 05/08/2008] [Indexed: 11/26/2022]
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18
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Lee M, Choi JS, Ko KS. Mitochondria targeting delivery of nucleic acids. Expert Opin Drug Deliv 2008; 5:879-87. [DOI: 10.1517/17425247.5.8.879] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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19
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Weglewska-Jurkiewicz A, Jakóbkiewicz-Banecka J, Pronicka E, Wegrzyn G. False Positive Results of Mitochondrial DNA Depletion/Deletion due to Single Nucleotide Substitutions Causing Appearance of Additional PvuII Restriction Sites. ACTA ACUST UNITED AC 2007; 16:116-20. [PMID: 17525683 DOI: 10.1097/pdm.0b013e3180336271] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Human mitochondrial diseases are usually caused by dysfunction of mitochondrial DNA (mtDNA), particularly by point mutations, deletions, or depletions. In commonly used procedures for molecular diagnostics of mitochondrial dysfunction, one of the first steps is linearization of circular mitochondrial genomes with either BamHI or PvuII restriction endonulease, which cuts human mtDNA at a unique site. Here, we describe a case of false positive results, which suggested mtDNA depletion or a large deletion in a patient's tissue sample. More detailed analysis (mtDNA sequencing) revealed that these false positive results were caused by the presence of the 12753A>G substitution in the gene coding for NADH dehydrogenase subunit 5 (ND5). This substitution results in no change in amino acid sequence of the gene product but creates an additional PvuII site. Investigating a population of 200 patients not affected by mitochondrial diseases, we found an additional case of 12753A>G, and also another substitution, 12804T>C, which also results in no change in amino acid sequence of ND5 but creates an additional PvuII site. A few cases of 12753A>G and 12804T>C substitutions were found previously in Asian, American, African, and European populations (though they were not reported to date in the MITOMAP), but those samples were used in population studies and not tested for mtDNA deletion or depletion. Therefore, we present a cautionary report indicating that these mtDNA polymorphisms exist in various human populations (and thus, they are panethnic) and may cause false positive results of standard molecular analyses, including molecular diagnostics, of human mtDNA.
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20
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Lee M, Choi JS, Choi MJ, Pak YK, Rhee BD, Ko KS. DNA delivery to the mitochondria sites using mitochondrial leader peptide conjugated polyethylenimine. J Drug Target 2007; 15:115-22. [PMID: 17365282 DOI: 10.1080/10611860600953555] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Some genetic diseases are associated with the defects of the mitochondrial genome. Direct DNA delivery to the mitochondrial matrix has been suggested as an approach for mitochondrial gene therapy for these diseases. We hypothesized that a mitochondrial leader peptide (LP) conjugated polyethylenimine (PEI) could deliver DNA to the mitochondrial sites. PEI-LP was synthesized by the conjugation of LP to PEI using disulfide bond. The complex formation of PEI-LP with DNA was confirmed by a gel retardation assay. In this study, DNA was completely retarded at a 0.4/1 PEI-LP/DNA weight ratio. In vitro delivery tests into isolated mitochondria or living cells were performed with rhodamin-labeled DNA and PEI-LP. In vitro cell-free delivery assay with isolated mitochondria showed that PEI-LP/DNA complexes were localized at mitochondria sites. Furthermore, the PEL-LP/DNA complexes were localized at the mitochondrial sites in living cells. However, a control carrier, PEI, did not show this effect. In addition, MTT assay showed that PEI-LP showed lower cytotoxicity than PEI. These results suggest that PEI-LP can deliver DNA to the mitochondrial sites and may be useful for the development of mitochondrial gene therapy.
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Affiliation(s)
- Minhyung Lee
- Department of Bioengineering, College of Engineering, Hanyang University, Seoul 133-791, South Korea
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21
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Boelsterli UA, Lim PLK. Mitochondrial abnormalities--a link to idiosyncratic drug hepatotoxicity? Toxicol Appl Pharmacol 2006; 220:92-107. [PMID: 17275868 DOI: 10.1016/j.taap.2006.12.013] [Citation(s) in RCA: 166] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2006] [Revised: 12/12/2006] [Accepted: 12/12/2006] [Indexed: 12/17/2022]
Abstract
Idiosyncratic drug-induced liver injury (DILI) is a major clinical problem and poses a considerable challenge for drug development as an increasing number of successfully launched drugs or new potential drugs have been implicated in causing DILI in susceptible patient subsets. Although the incidence for a particular drug is very low (yet grossly underestimated), the outcome of DILI can be serious. Unfortunately, prediction has remained poor (both for patients at risk and for new chemical entities). The underlying mechanisms and the determinants of susceptibility have largely remained ill-defined. The aim of this review is to provide both clinical and experimental evidence for a major role of mitochondria both as a target of drugs causing idiosyncratic DILI and as mediators of delayed liver injury. We develop a unifying hypothesis that involves underlying genetic or acquired mitochondrial abnormalities as a major determinant of susceptibility for a number of drugs that target mitochondria and cause DILI. The mitochondrial hypothesis, implying gradually accumulating and initially silent mitochondrial injury in heteroplasmic cells which reaches a critical threshold and abruptly triggers liver injury, is consistent with the findings that typically idiosyncratic DILI is delayed (by weeks or months), that increasing age and female gender are risk factors and that these drugs are targeted to the liver and clearly exhibit a mitochondrial hazard in vitro and in vivo. New animal models (e.g., the Sod2(+/-) mouse) provide supporting evidence for this concept. However, genetic analyses of DILI patient samples are needed to ultimately provide the proof-of-concept.
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Affiliation(s)
- Urs A Boelsterli
- Molecular Toxicology Lab, Department of Pharmacology, Yong Loo Lin School of Medicine, Singapore.
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22
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D'Souza GGM, Boddapati SV, Weissig V. Gene therapy of the other genome: the challenges of treating mitochondrial DNA defects. Pharm Res 2006; 24:228-38. [PMID: 17180727 DOI: 10.1007/s11095-006-9150-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2006] [Accepted: 08/17/2006] [Indexed: 01/08/2023]
Abstract
Human mitochondrial DNA is a 16.5 kb circular DNA molecule located inside the mitochondrial matrix. Although accounting for only about 1% of total cellular DNA, defects in mitochondrial DNA have been found to have major effects on human health. A single mtDNA mutation may cause a bewildering variety of clinical symptoms mainly involving the neuromuscular system at any age of onset. Despite significant advances in the understanding of mitochondrial DNA defects at a molecular level, the clinical diagnosis of mtDNA diseases remains a significant challenge and effective therapies for such diseases are as yet unavailable. In contrast to gene therapy for chromosomal DNA defects, mitochondrial gene therapy is a field that is still in its infancy and attempts towards gene therapy of the mitochondrial genome are rare. In this review we outline what we believe are the unique challenges associated with the correction of mtDNA mutations and summarize current approaches to gene therapy for the "other genome".
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Affiliation(s)
- Gerard G M D'Souza
- Bouvé College of Health Sciences, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, 211 Mugar Building, Boston, Massachusetts 02115, USA
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23
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Weissig V, Boddapati SV, Cheng SM, D'Souza GGM. Liposomes and liposome-like vesicles for drug and DNA delivery to mitochondria. J Liposome Res 2006; 16:249-64. [PMID: 16952879 DOI: 10.1080/08982100600851169] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Mitochondrial research is presently one of the fastest growing disciplines in biomedicine. Since the early 1990s, it has become increasingly evident that mitochondrial dysfunction contributes to a large variety of human disorders, ranging from neurodegenerative and neuromuscular diseases, obesity, and diabetes to ischemia-reperfusion injury and cancer. Most remarkably, mitochondria, the "power house" of the cell, have also become accepted as the "motor of cell death" reflecting their recognized key role during apoptosis. Based on these recent exciting developments in mitochondrial research, increasing pharmacological efforts have been made leading to the emergence of "Mitochondrial Medicine" as a whole new field of biomedical research. The identification of molecular mitochondrial drug targets in combination with the development of methods for selectively delivering biologically active molecules to the site of mitochondria will eventually launch a multitude of new therapies for the treatment of mitochondria-related diseases, which are based either on the selective protection, repair, or eradication of cells. Yet, while tremendous efforts are being undertaken to identify new mitochondrial drugs and drug targets, the development of mitochondria-specific drug carrier systems is lagging behind. To ensure a high efficiency of current and future mitochondrial therapeutics, colloidal vectors, i.e., delivery systems, need to be developed able to selectively transport biologically active molecules to and into mitochondria within living human cells. Here we review ongoing efforts in our laboratory directed toward the development of different phospholipid- and non-phospholipid-based mitochondriotropic drug carrier systems.
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Affiliation(s)
- Volkmar Weissig
- Northeastern University, Bouve College of Health Sciences, School of Pharmacy, Department of Pharmaceutics, Boston, MA 02115, USA.
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24
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Low Molecular Weight Polyethylenimine-Mitochondrial Leader Peptide Conjugate for DNA Delivery to Mitochondria. B KOREAN CHEM SOC 2006. [DOI: 10.5012/bkcs.2006.27.9.1335] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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25
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Houshmand M, Mahmoudi T, Panahi MSS, Seyedena Y, Saber S, Ataei M. Identification of a new human mtDNA polymorphism (A14290G) in the NADH dehydrogenase subunit 6 gene. Braz J Med Biol Res 2006; 39:725-30. [PMID: 16751977 DOI: 10.1590/s0100-879x2006000600004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Leber's hereditary optic neuropathy (LHON) is a maternally inherited form of retinal ganglion cell degeneration leading to optic atrophy in young adults. Several mutations in different genes can cause LHON (heterogeneity). The ND6 gene is one of the mitochondrial genes that encodes subunit 6 of complex I of the respiratory chain. This gene is a hot spot gene. Fourteen Persian LHON patients were analyzed with single-strand conformational polymorphism and DNA sequencing techniques. None of these patients had four primary mutations, G3460A, G11788A, T14484C, and G14459A, related to this disease. We identified twelve nucleotide substitutions, G13702C, T13879C, T14110C, C14167T, G14199T, A14233G, G14272C, A14290G, G14365C, G14368C, T14766C, and T14798C. Eleven of twelve nucleotide substitutions had already been reported as polymorphism. One of the nucleotide substitutions (A14290G) has not been reported. The A14290G nucleotide substitution does not change its amino acid (glutamic acid). We looked for base conservation using DNA star software (MEGALIGN program) as a criterion for pathogenic or nonpathogenic nucleotide substitution in A14290G. The results of ND6 gene alignment in humans and in other species (mouse, cow, elegans worm, and Neurospora crassa mold) revealed that the 14290th base was not conserved. Fifty normal controls were also investigated for this polymorphism in the Iranian population and two had A14290G polymorphism (4%). This study provides evidence that the mtDNA A14290G allele is a new nonpathogenic polymorphism. We suggest follow-up studies regarding this polymorphism in different populations.
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Affiliation(s)
- M Houshmand
- Department of Medical Genetics, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran.
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26
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Ong MMK, Wang AS, Leow KY, Khoo YM, Boelsterli UA. Nimesulide-induced hepatic mitochondrial injury in heterozygous Sod2(+/-) mice. Free Radic Biol Med 2006; 40:420-9. [PMID: 16443156 DOI: 10.1016/j.freeradbiomed.2005.08.038] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2005] [Accepted: 08/22/2005] [Indexed: 11/16/2022]
Abstract
Nimesulide, a preferential COX-2 inhibitor, has been associated with rare idiosyncratic hepatotoxicity. The underlying mechanisms of liver injury are unknown, but experimental evidence has identified oxidative stress as a potential hazard and mitochondria as a target. The aim of this study was to explore whether genetic mitochondrial abnormalities, resulting in impaired mitochondrial function and mildly increased oxidative stress, might sensitize mice to the hepatic adverse effects of nimesulide. We used heterozygous superoxide dismutase 2 (Sod2(+/-)) mice as a model, as these mice develop clinically silent mitochondrial stress but otherwise appear normal. Nimesulide was administered for 4 weeks (10 mg/kg, ip, bid), at a dose equivalent to human therapeutic dosage. We found that the drug potentiated hepatic mitochondrial oxidative injury (decreased aconitase activity, increased protein carbonyls) in Sod2(+/-), but not wild-type, mice. Furthermore, the nimesulide-treated mutant mice exhibited increased hepatic cytosolic levels of cytochrome c and caspase-3 activity, as well as increased numbers of apoptotic hepatocytes. Finally, nimesulide in vitro caused a concentration-dependent net increase in superoxide anion in mitochondria from Sod2(+/-), but not Sod2(+/+) mice. In conclusion, repeated administration of nimesulide can superimpose an oxidant stress, potentiate mitochondrial damage, and activate proapoptotic factors in mice with genetically compromised mitochondrial function.
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Affiliation(s)
- Michie M K Ong
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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27
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Rasmussen AK, Rasmussen LJ. Targeting of O6-MeG DNA methyltransferase (MGMT) to mitochondria protects against alkylation induced cell death. Mitochondrion 2005; 5:411-7. [PMID: 16233991 DOI: 10.1016/j.mito.2005.08.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2005] [Revised: 08/23/2005] [Accepted: 08/29/2005] [Indexed: 11/24/2022]
Abstract
Mitochondrial DNA (mtDNA) mutations are implicated in pathogenesis of human diseases including cancer. To prevent mutations cells have developed repair systems to counteract harmful genetic changes caused by DNA damaging agents. One such DNA repair protein is the O(6)-Methylguanine-DNA methyltransferase (MGMT) that prevents certain types of alkylation damage. Yet, the role of MGMT in preventing alkylation induced DNA damage in mtDNA is unclear. We explored the idea of increasing cell survival after alkylation damage by overexpressing MGMT in mitochondria. We show that overexpression of this repair protein in mitochondria increases cell survival after treatment with the DNA damaging agent MNNG.
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Affiliation(s)
- Anne Karin Rasmussen
- Department of Life Sciences and Chemistry, Roskilde University, 4000 Roskilde, Denmark
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28
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Hao R, Zhao MW, Hao ZX, Yao YN, Wang ED. A T-stem slip in human mitochondrial tRNALeu(CUN) governs its charging capacity. Nucleic Acids Res 2005; 33:3606-13. [PMID: 15972857 PMCID: PMC1157101 DOI: 10.1093/nar/gki677] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The human mitochondrial tRNALeu(CUN) [hmtRNALeu(CUN)] corresponds to the most abundant codon for leucine in human mitochondrial protein genes. Here, in vitro studies reveal that the U48C substitution in hmtRNALeu(CUN), which corresponds to the pathological T12311C gene mutation, improved the aminoacylation efficiency of hmtRNALeu(CUN). Enzymatic probing suggested a more flexible secondary structure in the wild-type hmtRNALeu(CUN) transcript compared with the U48C mutant. Structural analysis revealed that the flexibility of hmtRNALeu(CUN) facilitates a T-stem slip resulting in two potential tertiary structures. Several rationally designed tRNALeu(CUN) mutants were generated to examine the structural and functional consequences of the T-stem slip. Examination of these hmtRNALeu(CUN) mutants indicated that the T-stem slip governs tRNA accepting activity. These results suggest a novel, self-regulation mechanism of tRNA structure and function.
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Affiliation(s)
- Rui Hao
- Graduate School of the Chinese Academy of Sciences, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, The Chinese Academy of Sciences320 Yue Yang Road, Shanghai 200031, People's Republic of China
| | - Ming-Wei Zhao
- Graduate School of the Chinese Academy of Sciences, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, The Chinese Academy of Sciences320 Yue Yang Road, Shanghai 200031, People's Republic of China
| | - Zhan-Xi Hao
- Graduate School of the Chinese Academy of Sciences, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, The Chinese Academy of Sciences320 Yue Yang Road, Shanghai 200031, People's Republic of China
| | | | - En-Duo Wang
- Graduate School of the Chinese Academy of Sciences, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, The Chinese Academy of Sciences320 Yue Yang Road, Shanghai 200031, People's Republic of China
- To whom correspondence should be addressed. Tel: +86 21 54921241; Fax: +86 21 54921011;
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29
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Pulkes T, Liolitsa D, Eunson LH, Rose M, Nelson IP, Rahman S, Poulton J, Marchington DR, Landon DN, Debono AG, Morgan-Hughes JA, Hanna MG. New phenotypic diversity associated with the mitochondrial tRNA(SerUCN) gene mutation. Neuromuscul Disord 2005; 15:364-71. [PMID: 15833431 DOI: 10.1016/j.nmd.2005.01.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2004] [Revised: 01/15/2005] [Accepted: 01/21/2005] [Indexed: 01/29/2023]
Abstract
We performed detailed clinical, histopathological, biochemical, in vitro translation and molecular genetic analysis in patients from two unrelated families harbouring the tRNA(SerUCN) 7472C-insertion mutation. Proband 1 developed a progressive neurodegenerative phenotype characterised by myoclonus, epilepsy, cerebellar ataxia and progressive hearing loss. Proband 2 had a comparatively benign phenotype characterised by isolated myopathy with exercise intolerance. Both patients had the 7472C-insertion mutation in identical proportions and they exhibited a similar muscle biochemical and histopathological phenotype. However, proband 2 also had a previously unreported homoplasmic A to C transition at nucleotide position 7472 in the tRNA(SerUCN) gene. This change lengthens further the homopolymeric C run already expanded by the 7472C-insertion. These data extend the phenotypic range associated with the 7472C-insertion to include isolated skeletal myopathy, as well as a MERRF-like phenotype.
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MESH Headings
- Adolescent
- Adult
- DNA Mutational Analysis/methods
- DNA, Mitochondrial/genetics
- Electron Transport Complex IV/metabolism
- Electrophoresis/methods
- Female
- Humans
- Male
- Microscopy, Electron, Transmission/methods
- Mitochondria, Muscle/pathology
- Mitochondrial Encephalomyopathies/enzymology
- Mitochondrial Encephalomyopathies/genetics
- Mitochondrial Encephalomyopathies/pathology
- Mitochondrial Encephalomyopathies/physiopathology
- Mitochondrial Proteins/metabolism
- Muscle, Skeletal/enzymology
- Muscle, Skeletal/pathology
- Muscle, Skeletal/ultrastructure
- Mutation
- Nucleic Acid Conformation
- Phenotype
- RNA, Transfer, Ser/chemistry
- RNA, Transfer, Ser/genetics
- Serine/metabolism
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Affiliation(s)
- T Pulkes
- Centre for Neuromuscular Disease, Institute of Neurology, University College London, Queen Square, London WC1N 3BG, UK
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30
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Abstract
Mitochondrial dysfunction causes or contributes to a large number of human disorders including neuromuscular and neurodegenerative diseases, diabetes, ischaemia-reperfusion injury and cancer. Increasing efforts are being made towards mitochondria-directed pharmacological intervention, leading to the emergence of 'mitochondrial medicine' as a new field of biomedical research. The identification of new molecular mitochondrial drug targets in combination with the development of methods for selectively delivering biologically active molecules to the site of mitochondria will eventually launch new therapies for the treatment of mitochondria-related diseases, based either on the selective protection, repair or eradication of cells. This review discusses the need for the development of mitochondria-specific drug and DNA delivery systems, and evaluates the currently employed strategies for mitochondrial drug targeting, including some of their potential therapeutic applications.
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Affiliation(s)
- Volkmar Weissig
- Northeastern University, Department of Pharmaceutical Sciences, School of Pharmacy, Bouve College of Health Sciences, 360 Huntington Avenue, 211 Mugar, Boston, MA 02115, USA.
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31
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Cardaioli E, Da Pozzo P, Radi E, Dotti MT, Federico A. A novel heteroplasmic tRNALeu(CUN) mtDNA point mutation associated with chronic progressive external ophthalmoplegia. Biochem Biophys Res Commun 2005; 327:675-8. [PMID: 15649400 DOI: 10.1016/j.bbrc.2004.11.170] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2004] [Indexed: 10/26/2022]
Abstract
We have sequenced all mitochondrial tRNA genes from a patient with chronic progressive external ophthalmoplegia (CPEO) and mitochondrial myopathy, who had no detectable large mtDNA deletions. Direct sequencing failed to detect previously reported mutations and showed a heteroplasmic mutation at nucleotide 12,276 in the tRNA(Leu(CUN)) gene, in the dihydrouridine stem, which is highly conserved through the species during evolution. RFLP analyses confirmed that 18% of muscle mtDNA harbored the mutation, while it was absent from DNA of fibroblasts and lymphocytes of the proband and in 110 patients with other encephalomyopathies. To date, besides large and single nucleotide deletions, several point mutations on mitochondrial tRNA genes have been reported in CPEO patients, but only three were in the gene coding for tRNA(Leu(CUN)).
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Affiliation(s)
- Elena Cardaioli
- Department of Neurological and Behavioural Sciences, University of Siena, Italy
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32
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Anitori R, Manning K, Quan F, Weleber RG, Buist NRM, Shoubridge EA, Kennaway NG. Contrasting phenotypes in three patients with novel mutations in mitochondrial tRNA genes. Mol Genet Metab 2005; 84:176-88. [PMID: 15670724 DOI: 10.1016/j.ymgme.2004.10.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2004] [Revised: 10/01/2004] [Accepted: 10/02/2004] [Indexed: 11/22/2022]
Abstract
We studied three patients, each harboring a novel mutation at a highly conserved position in a different mitochondrial tRNA gene. The mutation in patient 1 (T5543C) was associated with isolated mitochondrial myopathy, and occurred in the anticodon loop of tRNA(Trp). In patient 2, with mitochondrial myopathy and marked retinopathy, the mutation (G14710A) resulted in an anticodon swap (Glu to Lys) in tRNA(Glu). Patient 3, who manifested mitochondrial encephalomyopathy and moderate retinal dysfunction, harbored a mutation (C3287A) in the TpsiC loop of tRNA(Leu(UUR)). The mutations were heteroplasmic in muscle in all cases, and sporadic in two cases. PCR-RFLP analysis in all patients showed much higher amounts of mutated mtDNA in affected tissue (muscle) than unaffected tissue (blood), and significantly higher levels of mutated mtDNA in cytochrome c oxidase (COX)-negative muscle fibers than in COX-positive fibers, confirming the pathogenicity of these mutations. The mutation was also detected in single hair roots from all three patients, indicating that each mutation must have arisen early in embryonic development or in maternal germ cells. This suggests that individual hair root analyses may reflect a wider tissue distribution of mutated mtDNA than is clinically apparent, and might be useful in predicting prognosis and, perhaps, the risk of transmitting the mutation to offspring. Our data suggest a correlation between clinical phenotype and distribution of mutated mtDNA in muscle versus hair roots. Furthermore, the high threshold for phenotypic expression in single muscle fibers (92-96%) suggests that therapies may only need to increase the percentage of wild-type mtDNA by a small amount to be beneficial.
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Affiliation(s)
- Roberto Anitori
- Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, OR 97239, USA
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33
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Fang DC, Fang L, Wang RQ, Yang SM. Nuclear and mitochondrial DNA microsatellite instability in Chinese hepatocellular carcinoma. World J Gastroenterol 2004; 10:371-5. [PMID: 14760760 PMCID: PMC4724920 DOI: 10.3748/wjg.v10.i3.371] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
AIM: To study the nuclear microsatellite instability (nMSI) at BAT26 and mitochondral microsalellite instability (mtMSI) in the occurrence and development of hepatocellular carcinoma and the relationship between nMSI and mtMSI.
METHODS: nMSI was observed with PCR and mtMSI with PCR-SSCP in 52 cases of hepatocellular carcinoma.
RESULTS: mtMSI was detected in 11 out of the 52 cases of hepatocellular carcinoma (21.2%). Among the 11 cases of hepatocellular carcinoma with mtMSI, 7 occured in one locus and 4 in 2 loci. The frequency of mtMSI in the 52 cases of hepatocellular carcinoma showed no correlation to sex, age, infection of hepatitis B, liver cirrhosis as well as positive AFP of the patients (P > 0.05). In addition, nMSI was detected in 3 out of 52 cases of hepatocellular carcinoma (5.8%) and there was no correlation of the incidence of mtMSI to that of nMSI (P > 0.05).
CONCLUSION: mtMSI may be involved in the coccurrence and development of hepatocellular carcinoma and it is independent of nMSI.
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Affiliation(s)
- Dian-Chun Fang
- Department of Gastroenterology, Southwest Hospital, Third Military Medical University, Chongqing 400038, China.
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34
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Meulemans A, Lissens W, Van Coster R, De Meirleir L, Smet J, Nassogne MC, Liebaers I, Seneca S. Analysis of the mitochondrial encoded subunits of complex I in 20 patients with a complex I deficiency. Eur J Paediatr Neurol 2004; 8:299-306. [PMID: 15542384 DOI: 10.1016/j.ejpn.2004.07.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2004] [Accepted: 07/26/2004] [Indexed: 11/26/2022]
Abstract
NADH-ubiquinone oxidoreductase or complex I deficiency is a frequently diagnosed enzyme defect of the oxidative phosphorylation (OXPHOS) system in humans. However, in many patients, with complex I deficiency and clinical symptoms suggestive of mitochondrial disease, often no genetic defect can be found after investigation of the most common mitochondrial DNA (mtDNA) mutations. In this study, 20 patients were selected with a biochemically documented complex I defect and no common mtDNA mutation. We used the Denaturing Gradient Gel Electrophoresis (DGGE) method with primers encompassing all mitochondrial encoded fragments, to search in a systematic manner for mutations in the mitochondrial genome of complex I. In our group of patients, we were able to detect a total of 96 nucleotide changes. We were not able to find any disease causing mutation in the mitochondrial encoded subunits of complex I. These results suggested that the complex I deficiency in this group of patients is most probably caused by a defect in one of the nuclear encoded structural genes of complex I, or in one of the genes involved in proper assembly of the enzyme.
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Affiliation(s)
- Ann Meulemans
- Center for Medical genetics, Dutch speaking Free University of Brussels, AZ-VUB, Laarbeeklaan 101, B-1090 Brussels, Belgium
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D'Souza GGM, Rammohan R, Cheng SM, Torchilin VP, Weissig V. DQAsome-mediated delivery of plasmid DNA toward mitochondria in living cells. J Control Release 2003; 92:189-97. [PMID: 14499196 DOI: 10.1016/s0168-3659(03)00297-9] [Citation(s) in RCA: 166] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
DQAsomes are mitochondriotropic cationic 'bola-lipid'-based vesicles, which have been developed by us for the transport of drugs and DNA to mitochondria in living cells. This has made direct mitochondrial gene therapy feasible for the very first time. Our strategy for the delivery of DNA into the matrix of mitochondria is based upon the DQAsomal transport of a DNA-signal peptide conjugate to mitochondria, the selective liberation of this conjugate from DQAsomes at the mitochondrial membrane followed by DNA uptake via the mitochondrial protein import machinery. Using membrane-mimicking liposomes and isolated rat liver mitochondria we have shown earlier that DQAsome-DNA complexes (DQAplexes) selectively release pDNA when in contact with mitochondria-like membranes. Employing a newly developed protocol for selectively staining free pDNA in the cytosol of living cells and based on confocal fluorescence microscopic imaging we demonstrate here that DQAplexes appear to be able to escape from endosomes without loosing their pDNA load and transport the pDNA to the site of mitochondria at which at least a portion of the pDNA is released from its DQAsomal carrier. Free pDNA could not be detected anywhere else inside the cytosol of transfected cells demonstrating the target-selectivity of DQAsome-mediated DNA delivery to mitochondria.
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Affiliation(s)
- Gerard G M D'Souza
- Department of Pharmaceutical Sciences, Bouve College of Health Sciences, Northeastern University, Boston, MA 02115, USA
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Affiliation(s)
- Yau-Huei Wei
- Department of Biochemistry, Center for Cellular and Molecular Biology, National Yang-Ming University, Taipei, Taiwan, Republic of China
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Yao YN, Wang L, Wu XF, Wang ED. Human mitochondrial leucyl-tRNA synthetase with high activity produced from Escherichia coli. Protein Expr Purif 2003; 30:112-6. [PMID: 12821328 DOI: 10.1016/s1046-5928(03)00097-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The processing of human mitochondrial leucyl-tRNA synthetase had been previously investigated in insect cell. In the present work, the gene encoding human mitochondrial leucyl-tRNA synthetase with the same N-terminus as that processed in the mitochondria of insect cell was cloned and expressed in Escherichia coli. The enzyme was purified by affinity chromatography on Ni-NTA column. About 6 mg of human mitochondrial leucyl-tRNA synthetase was obtained from 1 liter of culture. The specific activity of the purified enzyme is 127.7 units/mg, the highest activity of the reported results; this enzyme has the potential for characterizing the mitochondrial tRNA mutants associated with some human mitochondrion-related neuromuscular disorders. The kinetic constants for three substrates: leucine, ATP, and E. coli tRNA1Leu (CAG) in the leucylation reaction are also reported herein.
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Affiliation(s)
- Yong-Neng Yao
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai 200031, PR China
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Liolitsa D, Hanna MG. Models of mitochondrial disease. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2003; 53:429-66. [PMID: 12512349 DOI: 10.1016/s0074-7742(02)53016-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Danae Liolitsa
- Centre for Neuromuscular Disease, Institute of Neurology, Queen Square, London, WC1N 3BG, United Kingdom
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Yao YN, Wang L, Wu XF, Wang ED. The processing of human mitochondrial leucyl-tRNA synthetase in the insect cells. FEBS Lett 2003; 534:139-42. [PMID: 12527375 DOI: 10.1016/s0014-5793(02)03833-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A His-tagged full-length cDNA of human mitochondrial leucyl-tRNA synthetase was expressed in a baculovirus system. The N-terminal sequence of the enzyme isolated from the mitochondria of insect cells was found to be IYSATGKWTKEYTL, indicating that the mitochondrial targeting signal peptide was cleaved between Ser39 and Ile40 after the enzyme precursor was translocated into mitochondria. The enzyme purified from mitochondria catalyzed the leucylation of Escherichia coli tRNA(1)(Leu)(CAG) and Aquifex aeolicus tRNA(Leu)(GAG) with higher catalytic activity in the leucylation of E. coli tRNA(Leu) than that previously expressed in E. coli without the N-terminal 21 residues.
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Affiliation(s)
- Yong Neng Yao
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai 200031, PR China
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Hafezparast M, Ahmad-Annuar A, Wood NW, Tabrizi SJ, Fisher EMC. Mouse models for neurological disease. Lancet Neurol 2002; 1:215-24. [PMID: 12849454 DOI: 10.1016/s1474-4422(02)00100-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The mouse has many advantages over human beings for the study of genetics, including the unique property that genetic manipulation can be routinely carried out in the mouse genome. Most importantly, mice and human beings share the same mammalian genes, have many similar biochemical pathways, and have the same diseases. In the minority of cases where these features do not apply, we can still often gain new insights into mouse and human biology. In addition to existing mouse models, several major programmes have been set up to generate new mouse models of disease. Alongside these efforts are new initiatives for the clinical, behavioural, and physiological testing of mice. Molecular genetics has had a major influence on our understanding of the causes of neurological disorders in human beings, and much of this has come from work in mice.
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Affiliation(s)
- Majid Hafezparast
- Department of Neurodegenerative Disease, National Hospital for Neurology and Neurosurgery, London, UK
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Harihara S, Nakamura K, Takubo K, Takeuchi F. Comparison of the level of mitochondrial DNA A3243G mutation in esophageal epithelium and myocardium from individuals of very advanced age. Exp Gerontol 2002; 37:917-23. [PMID: 12086700 DOI: 10.1016/s0531-5565(02)00020-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The A3243G mutation, one of the changes of human mitochondrial DNA (mtDNA) that accumulates in cells during aging, is a useful marker for investigating the aging of cells. We measured the mutation level of the mtDNA A3243G mutation using DNAs from two different tissues (esophageal epithelium and myocardium) from advanced elderly individuals. The mean level of the A3243G mutation for the esophageal epithelium was 0.0063+/-0.0019, and that for the myocardium was 0.0098+/-0.0031. The mutation level in the myocardium was significantly higher than that in the esophageal epithelium, indicating that more mtDNA A3243G mutations accumulated in the myocardium than in the esophageal epithelium. Since the myocardium is static with respect to cell turnover, but in the esophageal epithelium renewal is very rapid, it is possible that the mtDNA A3243G mutation in the myocardium accumulates more rapidly than in the esophageal epithelium. This phenomenon may reflect the difference in the longevity of cells in each of these tissues and their different levels of oxidative stress.
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Affiliation(s)
- Shinji Harihara
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Japan.
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Abstract
OBJECTIVES To review the advances in clinically useful molecular biological techniques and to identify their applications in clinical practice, as presented at the Tenth Annual William Beaumont Hospital DNA Symposium. DATA SOURCES The 11 manuscripts submitted were reviewed and their major findings were compared with literature on the same topic. STUDY SELECTION Manuscripts address creative thinking techniques applied to DNA discovery, extraction of DNA from clotted blood, the relationship of mitochondrial dysfunction in neurodegenerative disorders, and molecular methods to identify human lymphocyte antigen class I and class II loci. Two other manuscripts review current issues in molecular microbiology, including detection of hepatitis C virus and biological warfare. The last 5 manuscripts describe current issues in molecular cardiovascular disease, including assessing thrombotic risk, genomic analysis, gene therapy, and a device for aiding in cardiac angiogenesis. DATA SYNTHESIS Novel problem-solving techniques have been used in the past and will be required in the future in DNA discovery. The extraction of DNA from clotted blood demonstrates a potential cost-effective strategy. Cybrids created from mitochondrial DNA-depleted cells and mitochondrial DNA from a platelet donor have been useful in defining the role mitochondria play in neurodegeneration. Mitochondrial depletion has been reported as a genetically inherited disorder or after human immunodeficiency virus therapy. Hepatitis C viral detection by qualitative, quantitative, or genotyping techniques is useful clinically. Preparedness for potential biological warfare is a responsibility of all clinical laboratorians. Thrombotic risk in cardiovascular disorders may be assessed by coagulation screening assays and further defined by mutation analysis for specific genes for prothrombin and factor V Leiden. Gene therapy for reducing arteriosclerotic risk has been hindered primarily by complications introduced by the vectors used to introduce the therapeutic genes. Neovascularization in cardiac muscle with occluded vessels represents a promising method for recovery of viable tissue following ischemia. CONCLUSIONS The sequence of the human genome was reported by 2 groups in February 2001. The postgenomic era will emphasize the use of microarrays and database software for genomic and proteomic screening in the search for useful clinical assays. The number of molecular pathologic techniques and assays will expand as additional disease-associated mutations are defined. Gene therapy and tissue engineering will represent successful therapeutic adjuncts.
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Affiliation(s)
- Frederick L Kiechle
- Department of Clinical Pathology, William Beaumont Hospital, Royal Oak, MI 48073-6769, USA.
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Weissig V, Torchilin VP. Cationic bolasomes with delocalized charge centers as mitochondria-specific DNA delivery systems. Adv Drug Deliv Rev 2001; 49:127-49. [PMID: 11377808 DOI: 10.1016/s0169-409x(01)00131-4] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Since their first discovery during the end of the 1980s, the number of diseases found to be associated with a defect in the mitochondrial genome has grown significantly. However, despite major advances in understanding mtDNA defects at the genetic and biochemical level, there is no satisfactory treatment available for the vast majority of patients. This is largely due to the fact that most of these patients have respiratory chain defects, i.e. defects that involve the final common pathway of oxidative metabolism, making it impossible to bypass the defect by giving alternative metabolic carriers of energy. These objective limitations of conventional biochemical treatment for patients with defects of mtDNA warrant the exploration of gene therapy approaches. However, mitochondrial gene therapy currently appears to be only theoretical and speculative. Any possibility for gene replacement is dependent on the use of a yet unavailable mitochondrial transfection vector. In this review we describe the current state of the development of mitochondrial DNA delivery systems. We also summarize our own efforts in exploring the properties of dequalinium, a cationic bolaamphiphile with delocalized charge centers, for the design of a vector suited for the transport of DNA to mitochondria in living cells.
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Affiliation(s)
- V Weissig
- Northeastern University, Bouve College of Health Sciences, Department of Pharmaceutical Sciences, 360 Huntington Avenue, Boston, MA 02115, USA.
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