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Jia Z, Wang F, Li G, Jiang P, Leng Y, Ke L, Luo L, Gao W. Zinc finger protein 468 up-regulation of TFAM contributes to the malignant growth and cisplatin resistance of breast cancer cells. Cell Div 2024; 19:8. [PMID: 38429817 PMCID: PMC10908137 DOI: 10.1186/s13008-024-00113-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 02/21/2024] [Indexed: 03/03/2024] Open
Abstract
BACKGROUND Because of the progress on the diagnosis and treatment for patients with breast cancer (BC), the overall survival of the patients has been improved. However, a number of BC patients cannot benefit from the existing therapeutic strategies as the essential molecular events triggering the development of BC are not well understood. Previous studies have shown that abnormal expression of zinc finger proteins is involved in the development of various malignancies, whereas it remains largely unclear on their significance during the progression of BC. In this study, we aimed to explore the clinical relevance, cellular function and underlying mechanisms of zinc finger protein 468 (ZNF468) in BC. METHODS The clinical relevance of ZNF468 and TFAM was analyzed based on TCGA database. Overexpression or knockdown of ZNF468 and TFAM were performed by transfecting the cells with overexpression plasmids and siRNAs, respectively. Overexpression and knockdown efficacy was checked by immunoblotting. CCK-8, colony formation, transwell and apoptosis experiments were conducted to check the cellular function of ZNF468 and TFAM. The content of mtDNA was measured by the indicated assay kit. The effects of cisplatin on BC cells were detected by CCK-8 and colony formation assays. The regulation of ZNF468 on TFAM was analyzed by RT-qPCR, immunoblotting, dual luciferase activity and ChIP-qPCR assays. RESULTS ZNF468 was overexpressed in BC patients and inversely correlated with their prognosis. Based on overexpression and knockdown assays, we found that ectopic expression of ZNF468 was essential for the proliferation, growth and migration of BC cells. The expression of ZNF468 also negatively regulated the sensitivity of BC cells to the treatment of cisplatin. Mechanistically, ZNF468 potentiated the transcription activity of TFAM gene via direct binding on its promoter. Lastly, we demonstrated that ZNF468 up-regulation of TFAM was important for the growth, migration and cisplatin resistance in BC cells. CONCLUSION Our study indicates that ZNF468 promotes BC cell growth and migration via transcriptional activation of TFAM. ZNF468/TFAM axis can serve as the diagnostic and therapeutic target, as well as the predictor of cisplatin effectiveness in BC patients.
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Affiliation(s)
- Zhaoyang Jia
- Department of Radiation Oncology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Feng Wang
- Department of Radiation Oncology, Shanghai Fourth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Gongzhuo Li
- Department of Oncology, GuiHang Guiyang Hospital, Guiyang, China
| | - Ping Jiang
- Department of Oncology, GuiHang Guiyang Hospital, Guiyang, China
| | - Yuanxiu Leng
- Department of Oncology, GuiHang Guiyang Hospital, Guiyang, China
| | - Longzhu Ke
- Hubei University of Chinese Medicine, Wuhan, China
| | - Li Luo
- Department of Oncology, GuiHang Guiyang Hospital, Guiyang, China.
| | - Wei Gao
- Department of Radiation Oncology, Shanghai Fourth People's Hospital, School of Medicine, Tongji University, Shanghai, China.
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Longo M, Zatterale F, Spinelli R, Naderi J, Parrillo L, Florese P, Nigro C, Leone A, Moccia A, Desiderio A, Raciti GA, Miele C, Smith U, Beguinot F. Altered H3K4me3 profile at the TFAM promoter causes mitochondrial alterations in preadipocytes from first-degree relatives of type 2 diabetics. Clin Epigenetics 2023; 15:144. [PMID: 37679776 PMCID: PMC10486065 DOI: 10.1186/s13148-023-01556-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 08/14/2023] [Indexed: 09/09/2023] Open
Abstract
BACKGROUND First-degree relatives of type 2 diabetics (FDR) exhibit a high risk of developing type 2 diabetes (T2D) and feature subcutaneous adipocyte hypertrophy, independent of obesity. In FDR, adipose cell abnormalities contribute to early insulin-resistance and are determined by adipocyte precursor cells (APCs) early senescence and impaired recruitment into the adipogenic pathway. Epigenetic mechanisms signal adipocyte differentiation, leading us to hypothesize that abnormal epigenetic modifications cause adipocyte dysfunction and enhance T2D risk. To test this hypothesis, we examined the genome-wide histone profile in APCs from the subcutaneous adipose tissue of healthy FDR. RESULTS Sequencing-data analysis revealed 2644 regions differentially enriched in lysine 4 tri-methylated H3-histone (H3K4me3) in FDR compared to controls (CTRL) with significant enrichment in mitochondrial-related genes. These included TFAM, which regulates mitochondrial DNA (mtDNA) content and stability. In FDR APCs, a significant reduction in H3K4me3 abundance at the TFAM promoter was accompanied by a reduction in TFAM mRNA and protein levels. FDR APCs also exhibited reduced mtDNA content and mitochondrial-genome transcription. In parallel, FDR APCs exhibited impaired differentiation and TFAM induction during adipogenesis. In CTRL APCs, TFAM-siRNA reduced mtDNA content, mitochondrial transcription and adipocyte differentiation in parallel with upregulation of the CDKN1A and ZMAT3 senescence genes. Furthermore, TFAM-siRNA significantly expanded hydrogen peroxide (H2O2)-induced senescence, while H2O2 did not affect TFAM expression. CONCLUSIONS Histone modifications regulate APCs ability to differentiate in mature cells, at least in part by modulating TFAM expression and affecting mitochondrial function. Reduced H3K4me3 enrichment at the TFAM promoter renders human APCs senescent and dysfunctional, increasing T2D risk.
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Affiliation(s)
- Michele Longo
- Department of Translational Medicine, Federico II University of Naples, Naples, Italy
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Federica Zatterale
- Department of Translational Medicine, Federico II University of Naples, Naples, Italy
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Rosa Spinelli
- Department of Translational Medicine, Federico II University of Naples, Naples, Italy
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Jamal Naderi
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Luca Parrillo
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Pasqualina Florese
- Department of Translational Medicine, Federico II University of Naples, Naples, Italy
| | - Cecilia Nigro
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Alessia Leone
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Augusta Moccia
- Department of Translational Medicine, Federico II University of Naples, Naples, Italy
| | - Antonella Desiderio
- Department of Translational Medicine, Federico II University of Naples, Naples, Italy
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Gregory A Raciti
- Department of Translational Medicine, Federico II University of Naples, Naples, Italy.
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy.
| | - Claudia Miele
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy
| | - Ulf Smith
- Lundberg Laboratory for Diabetes Research, Department of Molecular and Clinical Medicine, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Francesco Beguinot
- Department of Translational Medicine, Federico II University of Naples, Naples, Italy.
- URT Genomics of Diabetes, Institute of Experimental Endocrinology and Oncology, National Research Council, Naples, Italy.
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3
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Oliveira VCD, Roballo KCS, Mariano Junior CG, Ambrósio CE. Gene Editing Technologies Targeting TFAM and Its Relation to Mitochondrial Diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1429:173-189. [PMID: 37486522 DOI: 10.1007/978-3-031-33325-5_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
Mitochondria are organelles present in the cytoplasm of eukaryotic cells; they play a key role in adenosine triphosphate (ATP) synthesis and oxidative phosphorylation. Mitochondria have their own DNA, mitochondrial DNA (mtDNA), keeping the function of the mitochondria. Mitochondrial transcription factor A (TFAM) is a member of the HMGB subfamily that binds to mtDNA promoters is and considered essential in mtDNA replication and transcription. More recently, TFAM has been shown to play a central role in the maintenance and regulation of mitochondrial copy number, inflammatory response, expression regulation, and mitochondrial genome activity. Gene editing tools such as the CRISPR-Cas 9 technique, TALENs, and other gene editing tools have been used to investigate the role of TFAM in mitochondrial mechanics and biogenesis as well as its correlation to mitochondrial disorders. Thus this chapter brings a summary of mitochondria function, dysfunction, the importance of TFAM in the maintenance of mitochondria, and state of the art of gene editing tools involving TFAM and mtDNA.
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Affiliation(s)
- Vanessa Cristina de Oliveira
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, SP, Brazil.
| | - Kelly Cristine Santos Roballo
- Biomedical Affairs and Research, Edward Via College of Osteopathic Medicine, Blacksburg, VA, USA
- Department of Biomedical Sciences and Pathobiology, Virginia Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA, USA
| | - Clesio Gomes Mariano Junior
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, SP, Brazil
| | - Carlos Eduardo Ambrósio
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, SP, Brazil
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Prevenzano I, Leone A, Longo M, Nicolò A, Cabaro S, Collina F, Panarese I, Botti G, Formisano P, Napoli R, Beguinot F, Miele C, Nigro C. Glyoxalase 1 knockdown induces age-related β-cell dysfunction and glucose intolerance in mice. EMBO Rep 2022; 23:e52990. [PMID: 35620868 PMCID: PMC9253754 DOI: 10.15252/embr.202152990] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 04/20/2022] [Accepted: 05/02/2022] [Indexed: 09/09/2023] Open
Abstract
Tight control of glycemia is a major treatment goal for type 2 diabetes mellitus (T2DM). Clinical studies indicated that factors other than poor glycemic control may be important in fostering T2DM progression. Increased levels of methylglyoxal (MGO) associate with complications development, but its role in the early steps of T2DM pathogenesis has not been defined. Here, we show that MGO accumulation induces an age-dependent impairment of glucose tolerance and glucose-stimulated insulin secretion in mice knockdown for glyoxalase 1 (Glo1KD). This metabolic alteration associates with the presence of insular inflammatory infiltration (F4/80-positive staining), the islet expression of senescence markers, and higher levels of cytokines (MCP-1 and TNF-α), part of the senescence-activated secretory profile, in the pancreas from 10-month-old Glo1KD mice, compared with their WT littermates. In vitro exposure of INS832/13 β-cells to MGO confirms its casual role on β-cell dysfunction, which can be reverted by senolytic treatment. These data indicate that MGO is capable to induce early phenotypes typical of T2D progression, paving the way for novel prevention approaches to T2DM.
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Affiliation(s)
- Immacolata Prevenzano
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
| | - Alessia Leone
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
| | - Michele Longo
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
| | - Antonella Nicolò
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
| | - Serena Cabaro
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
| | - Francesca Collina
- Pathology UnitIstituto Nazionale Tumori‐IRCCS‐Fondazione G.PascaleNaplesItaly
| | - Iacopo Panarese
- Unità di Anatomia PatologicaDipartimento di Salute Mentale e Fisica e Medicina PreventivaUniversità degli Studi della Campania "L. Vanvitelli"NaplesItaly
| | - Gerardo Botti
- Scientific DirectionIstituto Nazionale Tumori‐IRCCS‐Fondazione G.PascaleNaplesItaly
| | - Pietro Formisano
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
| | - Raffaele Napoli
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
| | - Francesco Beguinot
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
| | - Claudia Miele
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
| | - Cecilia Nigro
- URT Genomics of Diabetes‐IEOSCNR & Department of Translational Medicine – Federico IIUniversity of NaplesNaplesItaly
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Nusier M, Shah AK, Dhalla NS. Structure-Function Relationships and Modifications of Cardiac Sarcoplasmic Reticulum Ca2+-Transport. Physiol Res 2022; 70:S443-S470. [DOI: 10.33549/physiolres.934805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Sarcoplasmic reticulum (SR) is a specialized tubular network, which not only maintains the intracellular concentration of Ca2+ at a low level but is also known to release and accumulate Ca2+ for the occurrence of cardiac contraction and relaxation, respectively. This subcellular organelle is composed of several phospholipids and different Ca2+-cycling, Ca2+-binding and regulatory proteins, which work in a coordinated manner to determine its function in cardiomyocytes. Some of the major proteins in the cardiac SR membrane include Ca2+-pump ATPase (SERCA2), Ca2+-release protein (ryanodine receptor), calsequestrin (Ca2+-binding protein) and phospholamban (regulatory protein). The phosphorylation of SR Ca2+-cycling proteins by protein kinase A or Ca2+-calmodulin kinase (directly or indirectly) has been demonstrated to augment SR Ca2+-release and Ca2+-uptake activities and promote cardiac contraction and relaxation functions. The activation of phospholipases and proteases as well as changes in different gene expressions under different pathological conditions have been shown to alter the SR composition and produce Ca2+-handling abnormalities in cardiomyocytes for the development of cardiac dysfunction. The post-translational modifications of SR Ca2+ cycling proteins by processes such as oxidation, nitrosylation, glycosylation, lipidation, acetylation, sumoylation, and O GlcNacylation have also been reported to affect the SR Ca2+ release and uptake activities as well as cardiac contractile activity. The SR function in the heart is also influenced in association with changes in cardiac performance by several hormones including thyroid hormones and adiponectin as well as by exercise-training. On the basis of such observations, it is suggested that both Ca2+-cycling and regulatory proteins in the SR membranes are intimately involved in determining the status of cardiac function and are thus excellent targets for drug development for the treatment of heart disease.
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Affiliation(s)
| | | | - NS Dhalla
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen, Research Centre, 351 Tache Avenue, Winnipeg, MB, R2H 2A6 Canada.
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6
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VanEtten SL, Bonner MR, Ren X, Birnbaum LS, Kostyniak PJ, Wang J, Olson JR. Effect of exposure to 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) and polychlorinated biphenyls (PCBs) on mitochondrial DNA (mtDNA) copy number in rats. Toxicology 2021; 454:152744. [PMID: 33677009 PMCID: PMC8220889 DOI: 10.1016/j.tox.2021.152744] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 02/24/2021] [Accepted: 03/01/2021] [Indexed: 01/01/2023]
Abstract
Mitochondria are intracellular organelles responsible for biological oxidation and energy production. These organelles are susceptible to damage from oxidative stress and compensate for damage by increasing the number of copies of their own genome, mitochondrial DNA (mtDNA). Cancer and environmental exposure to some pollutants have also been associated with altered mtDNA copy number. Since exposures to polychlorinated biphenyls (PCBs) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) have been shown to increase oxidative stress, we hypothesize that mtDNA copy number will be altered with exposure to these compounds. mtDNA copy number was measured in DNA from archived frozen liver and lung specimens from the National Toxicology Program (NTP) study of female Harlan Sprague Dawley rats exposed to TCDD (3, 10, or 100 ng/kg/day), dioxin-like (DL) PCB 126 (10, 100, or 1000 ng/kg/day), non-DL PCB 153 (10, 100, or 1000 μg/kg/day), and PCB 126 + PCB 153 (10 ng/kg/day + 10 μg/kg/day, 100 ng/kg/day + 100 μg/kg/day, or 1000 ng/kg/day + 1000 μg/kg/day, respectively) for 13 and 52 weeks. An increase in mtDNA copy number was observed in the liver and lung of rats exposed to TCDD and the lung of rats exposed to the mixture of PCB 126 and PCB 153. A statistically significant positive dose-dependent trend was also observed in the lung of rats exposed to PCB 126 and a mixture of PCB 153 and PCB 126, although in neither case was the control copy number significantly exceeded at any dose level. These exposures produced a range of pathological responses in these organs in the two-year NTP studies. Conversely, there was a significant decrease or no change in mtDNA copy number in the liver and lung of rats exposed to non-DL PCB 153. This is consistent with a general lack of PCB 153 mediated liver or lung injury in the NTP study, with the exception of liver hypertrophy. Together, the results suggest that an increase in mtDNA copy number may serve as a sensitive, early biomarker of mitochondrial injury and oxidative stress that contributes to the development of the toxicity of dioxin-like compounds.
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Affiliation(s)
- Samantha L VanEtten
- Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Matthew R Bonner
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, Buffalo, NY, USA
| | - Xuefeng Ren
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, Buffalo, NY, USA
| | - Linda S Birnbaum
- Scientist Emeritus, National Institute of Environmental Health Sciences and National Toxicology Program, Research Triangle Park, NC, USA
| | - Paul J Kostyniak
- Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA; Department of Biotechnical and Clinical Laboratory Sciences, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Jie Wang
- Department of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Institute, Buffalo, NY, USA
| | - James R Olson
- Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA; Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, Buffalo, NY, USA.
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7
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Kim KS, Choi YK, Kim MJ, Hwang JW, Min K, Jung SY, Kim SK, Choi YS, Cho YW. Umbilical Cord-Mesenchymal Stem Cell-Conditioned Medium Improves Insulin Resistance in C2C12 Cell. Diabetes Metab J 2021; 45:260-269. [PMID: 32662257 PMCID: PMC8024157 DOI: 10.4093/dmj.2019.0191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 03/08/2020] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Umbilical cord-mesenchymal stem cell-conditioned medium (UC-MSC-CM) has emerged as a promising cell-free therapy. The aim of this study was to explore the therapeutic effects of UC-MSC-CM on insulin resistance in C2C12 cell. METHODS Insulin resistance was induced by palmitate. Effects of UC-MSC-CM on insulin resistance were evaluated using glucose uptake, glucose transporter type 4 (GLUT4) translocation, the insulin-signaling pathway, and mitochondrial contents and functions in C2C12 cell. RESULTS Glucose uptake was improved by UC-MSC-CM. UC-MSC-CM treatment increased only in membranous GLUT4 expression, not in cytosolic GLUT4 expression. It restored the insulin-signaling pathway in insulin receptor substrate 1 and protein kinase B. Mitochondrial contents evaluated by mitochondrial transcription factor A, mitochondrial DNA copy number, and peroxisome proliferator-activated receptor gamma coactivator 1-alpha were increased by UC-MSC-CM. In addition, UC-MSC-CM significantly decreased mitochondrial reactive oxygen species and increased fatty acid oxidation and mitochondrial membrane potential. There was no improvement in adenosine triphosphate (ATP) contents, but ATP synthesis was improved by UC-MSC-CM. Cytokine and active factor analysis of UC-MSC-CM showed that it contained many regulators inhibiting insulin resistance. CONCLUSION UC-MSC-CM improves insulin resistance with multiple mechanisms in C2C12 cell.
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Affiliation(s)
- Kyung-Soo Kim
- Department of Internal Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Yeon Kyung Choi
- Department of Biotechnology, CHA University, Seongnam, Korea
| | - Mi Jin Kim
- Department of Biotechnology, CHA University, Seongnam, Korea
| | - Jung Wook Hwang
- Department of Biotechnology, CHA University, Seongnam, Korea
| | - Kyunghoon Min
- Department of Rehabilitation Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Sang Youn Jung
- Department of Internal Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Soo-Kyung Kim
- Department of Internal Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Yong-Soo Choi
- Department of Biotechnology, CHA University, Seongnam, Korea
| | - Yong-Wook Cho
- Department of Internal Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
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Li L, Chu X, Yao Y, Cao J, Li Q, Ma H. (-)-Hydroxycitric Acid Alleviates Oleic Acid-Induced Steatosis, Oxidative Stress, and Inflammation in Primary Chicken Hepatocytes by Regulating AMP-Activated Protein Kinase-Mediated Reactive Oxygen Species Levels. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:11229-11241. [PMID: 32940033 DOI: 10.1021/acs.jafc.0c04648] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is one of the most complex liver diseases in the world, which is characterized by hepatic steatosis, oxidative stress, inflammation, and apoptosis. (-)-Hydroxycitric acid [(-)-HCA] can regulate obesity in different animals, while whether this beneficial effect of (-)-HCA can alleviate the NAFLD and its mechanism is unclear. Hence, this study aimed to determine the potential actions and mechanisms of (-)-HCA on NAFLD in oleic acid (OA)-induced hepatocytes. We found that (-)-HCA effectively improved OA-induced hepatic steatosis by regulating the expression level of fat metabolism key factors, which was achieved by activating AMP-activated protein kinase (AMPK) signaling in hepatocytes. Importantly, activated AMPK alleviates mitochondrial disorder via the peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α)-nuclear transcription factor 1 (NRF-1)-mitochondrial transcription factor A (TFAM) pathway, then reduces reactive oxygen species production, and blocks the activation of p38 MAPK-NF-κB pathway in OA-induced hepatocytes. These results not only provide a theoretical basis for the occurrence and development of NAFLD but also offer compelling evidence for prevention of NAFLD supplemental with (-)-HCA.
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Affiliation(s)
- Longlong Li
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Xu Chu
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Yao Yao
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Ji Cao
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Qian Li
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Haitian Ma
- Key Laboratory of Animal Physiology and Biochemistry, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
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9
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de Oliveira VC, Moreira GSA, Bressan FF, Gomes Mariano Junior C, Roballo KCS, Charpentier M, Concordet JP, Meirelles FV, Ambrósio CE. Edition of TFAM gene by CRISPR/Cas9 technology in bovine model. PLoS One 2019; 14:e0213376. [PMID: 30845180 PMCID: PMC6405117 DOI: 10.1371/journal.pone.0213376] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 02/19/2019] [Indexed: 11/24/2022] Open
Abstract
The mitochondrial transcription factor A (TFAM) is a mitochondrial DNA (mtDNA) binding protein essential for the initiation of transcription and genome maintenance. Recently it was demonstrated that the primary role of TFAM is to maintain the integrity of mtDNA and that it is a key regulator of mtDNA copy number. It was also shown that TFAM plays a central role in the mtDNA stress-mediated inflammatory response. In our study, we proposed to evaluate the possibility of editing the TFAM gene by CRISPR/Cas9 technology in bovine fibroblasts, as TFAM regulates the replication specificity of mtDNA. We further attempted to maintain these cells in culture post edition in a medium supplemented with uridine and pyruvate to mimic Rho zero cells that are capable of surviving without mtDNA, because it is known that the TFAM gene is lethal in knockout mice and chicken. Moreover, we evaluated the effects of TFAM modification on mtDNA copy number. The CRISPR gRNA was designed to target exon 1 of the bovine TFAM gene and subsequently cloned. Fibroblasts were transfected with Cas9 and control plasmids. After 24 h of transfection, cells were analyzed by flow cytometry to evaluate the efficiency of transfection. The site directed-mutation frequency was assessed by T7 endonuclease assay, and cell clones were analyzed for mtDNA copy number by Sanger DNA sequencing. We achieved transfection efficiency of 51.3%. We selected 23 successfully transformed clones for further analysis, and seven of these exhibited directed mutations at the CRISPR/Cas9 targeted site. Moreover, we also found a decrease in mtDNA copy number in the gene edited clones compared to that in the controls. These TFAM gene mutant cells were viable in culture when supplemented with uridine and pyruvate. We conclude that this CRISPR/Cas9 design was efficient, resulting in seven heterozygous mutant clones and opening up the possibility to use these mutant cell lines as a model system to elucidate the role of TFAM in the maintenance of mtDNA integrity.
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Affiliation(s)
- Vanessa Cristina de Oliveira
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Gabriel Sassarão Alves Moreira
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Fabiana Fernandes Bressan
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Clésio Gomes Mariano Junior
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Kelly Cristine Santos Roballo
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Marine Charpentier
- Laboratoire Structure et Instabilité des Génomes, Museum National d’Histoire Naturelle, INSERM U1154, CNRS UMR7196, Paris, France
| | - Jean-Paul Concordet
- Laboratoire Structure et Instabilité des Génomes, Museum National d’Histoire Naturelle, INSERM U1154, CNRS UMR7196, Paris, France
| | - Flávio Vieira Meirelles
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Carlos Eduardo Ambrósio
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, São Paulo, Brazil
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10
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Singh RM, Waqar T, Howarth FC, Adeghate E, Bidasee K, Singh J. Hyperglycemia-induced cardiac contractile dysfunction in the diabetic heart. Heart Fail Rev 2017; 23:37-54. [DOI: 10.1007/s10741-017-9663-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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11
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Gao W, Wu M, Wang N, Zhang Y, Hua J, Tang G, Wang Y. Increased expression of mitochondrial transcription factor A and nuclear respiratory factor-1 predicts a poor clinical outcome of breast cancer. Oncol Lett 2017; 15:1449-1458. [PMID: 29434836 PMCID: PMC5774493 DOI: 10.3892/ol.2017.7487] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 08/11/2017] [Indexed: 01/19/2023] Open
Abstract
Nuclear respiratory factor-1 (Nrf1) and mitochondrial transcription factor A (TFAM) are involved in the regulation of a variety of mitochondrial functional genes, which are associated with decreased sensitivity of tumor cells to chemotherapy. However, the expression status of Nrf1 and TFAM, as well as their clinical significance in breast cancer, is unknown. In the present study, tumor tissues and corresponding adjacent normal tissues were collected from 336 patients with breast cancer, and Nrf1 and TFAM expression was analyzed by immunohistochemistry using a tissue microarray. Expression of Nrf1 and TFAM was significantly increased in breast cancer tissue compared with adjacent normal tissues. In addition, patients positive for Nrf1 or TFAM had a poorer clinical prognosis than patients who were negative, and those positive for Nrf1 and TFAM had the shortest survival time. These results suggest that Nrf1 and TFAM are potential biomarkers for the determination of individualized therapy and the prognosis of breast cancer, and molecular targeting of Nrf1 and TFAM is a promising strategy for the sensitization of breast cancer cells to chemotherapeutics.
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Affiliation(s)
- Wei Gao
- Department of Radiation Oncology, Shanghai 9th People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200433, P.R. China.,Department of Oncology, Changhai Hospital, The Second Military Medical University, Shanghai 200433, P.R. China
| | - Meihong Wu
- Department of Oncology, Changhai Hospital, The Second Military Medical University, Shanghai 200433, P.R. China
| | - Ning Wang
- Department of Oncology, Changhai Hospital, The Second Military Medical University, Shanghai 200433, P.R. China
| | - Yingyi Zhang
- Department of Oncology, Changhai Hospital, The Second Military Medical University, Shanghai 200433, P.R. China
| | - Jing Hua
- Department of Oncology, Changhai Hospital, The Second Military Medical University, Shanghai 200433, P.R. China
| | - Gusheng Tang
- Department of Hematology, Changhai Hospital, The Second Military Medical University, Shanghai 200433, P.R. China
| | - Yajie Wang
- Department of Oncology, Changhai Hospital, The Second Military Medical University, Shanghai 200433, P.R. China
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12
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Predescu SA, Zhang J, Bardita C, Patel M, Godbole V, Predescu DN. Mouse Lung Fibroblast Resistance to Fas-Mediated Apoptosis Is Dependent on the Baculoviral Inhibitor of Apoptosis Protein 4 and the Cellular FLICE-Inhibitory Protein. Front Physiol 2017; 8:128. [PMID: 28352235 PMCID: PMC5348516 DOI: 10.3389/fphys.2017.00128] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 02/17/2017] [Indexed: 01/01/2023] Open
Abstract
A characteristic feature of idiopathic pulmonary fibrosis (IPF) is accumulation of apoptotic resistant fibroblasts/myofibroblasts in the fibroblastic foci. As caveolin (Cav)-null mice develop pulmonary fibrosis (PF), we hypothesized that the participating fibroblasts display an apoptosis-resistant phenotype. To test this hypothesis and identify the molecular mechanisms involved we isolated lung fibroblasts from Cav-null mice and examined the expression of several inhibitors of apoptosis (IAPs), of c-FLIP, of Bcl-2 proteins and of the death receptor CD95/Fas. We found significant increase in XIAP and c-FLIP constitutive protein expression with no alteration of Bcl-2 and lower levels of CD95/Fas. The isolated fibroblasts were then treated with the CD95/Fas ligand (FasL) to induce apoptosis. While the morphological and biochemical alterations induced by FasL were similar in wild-type (wt) and Cav-null mouse lung fibroblasts, the time course and the extent of the alterations were greater in the Cav-null fibroblasts. Several salient features of Cav-null fibroblasts response such as loss of membrane potential, fragmentation of the mitochondrial continuum concurrent with caspase-8 activation, and subsequent Bid cleavage, prior to caspase-3 activation were detected. Furthermore, M30 antigen formation, phosphatidylserine expression and DNA fragmentation were caspase-3 dependent. SiRNA-mediated silencing of XIAP and c-FLIP, individually or combined, enhanced the sensitivity of lung fibroblasts to FasL-induced apoptosis. Pharmacological inhibition of Bcl-2 had no effect. Together our findings support a mechanism in which CD95/Fas engagement activates caspase-8, inducing mitochondrial apoptosis through Bid cleavage. XIAP and c-FLIP fine tune this process in a cell-type specific manner.
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Affiliation(s)
- Sanda A Predescu
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
| | - Jian Zhang
- Department of Biological Sciences, Columbia University New York, NY, USA
| | - Cristina Bardita
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
| | - Monal Patel
- Northwestern University Feinberg School of Medicine Chicago, IL, USA
| | - Varun Godbole
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
| | - Dan N Predescu
- Department of Internal Medicine, Division of Pulmonary and Critical Care, Rush University, Medical College Chicago, IL, USA
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13
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Cameron RB, Beeson CC, Schnellmann RG. Development of Therapeutics That Induce Mitochondrial Biogenesis for the Treatment of Acute and Chronic Degenerative Diseases. J Med Chem 2016; 59:10411-10434. [PMID: 27560192 DOI: 10.1021/acs.jmedchem.6b00669] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Mitochondria have various roles in cellular metabolism and homeostasis. Because mitochondrial dysfunction is associated with many acute and chronic degenerative diseases, mitochondrial biogenesis (MB) is a therapeutic target for treating such diseases. Here, we review the role of mitochondrial dysfunction in acute and chronic degenerative diseases and the cellular signaling pathways by which MB is induced. We then review existing work describing the development and application of drugs that induce MB in vitro and in vivo. In particular, we discuss natural products and modulators of transcription factors, kinases, cyclic nucleotides, and G protein-coupled receptors.
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Affiliation(s)
- Robert B Cameron
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina , 280 Calhoun Street, Charleston, South Carolina 29425, United States.,College of Pharmacy, University of Arizona , 1295 N. Martin Avenue, Tucson, Arizona 85721, United States
| | - Craig C Beeson
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina , 280 Calhoun Street, Charleston, South Carolina 29425, United States
| | - Rick G Schnellmann
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina , 280 Calhoun Street, Charleston, South Carolina 29425, United States.,College of Pharmacy, University of Arizona , 1295 N. Martin Avenue, Tucson, Arizona 85721, United States
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14
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Hanafi MY, Abdelkhalek TM, Saad MI, Saleh MM, Haiba MM, Kamel MA. Diabetes-induced perturbations are subject to intergenerational transmission through maternal line. J Physiol Biochem 2016; 72:315-26. [PMID: 27038466 DOI: 10.1007/s13105-016-0483-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 03/21/2016] [Indexed: 01/09/2023]
Abstract
The hypothesis of fetal origins of adult disease states that early life events program the occurrence of significant adult diseases, including diabetes and obesity. Maternal diabetes is associated with general stress environment for developing fetus, and gestational diabetes is an independent risk factor for type 2 diabetes and metabolic syndrome in offspring. Intra-uterine fetal programming of fetal tissues exposes the offspring to increased risk of impaired glucose tolerance, type 2 diabetes, and cardiovascular disease. Here, we examined the transmission of maternal diabetes-induced fetal programming in second generation and compared maternal and paternal routes of intergenerational effects. We organized 40 Wistar rats into three groups, male offspring of diabetic mothers, female offspring of diabetic mothers, and offspring of control mothers. These groups were mated with normal healthy rats to assess the effect of grand-maternal diabetes on pregnancy outcome in F2 rats, as well as glucose-sensing parameters, insulin resistance, and glucose tolerance prenatally and postnatally. We found that F2 offspring of diabetic mothers had impaired glucose sensing, increased oxidative stress, insulin resistance, and impaired glucose tolerance, and these effects were more prominent in the F2 offspring of F1 female rats (F2-DF1F). We deduce that fetal programming of maternal diabetes is mostly transmitted through maternal line across two generations.
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MESH Headings
- Adipose Tissue/embryology
- Adipose Tissue/metabolism
- Animals
- Diabetes Mellitus, Experimental/blood
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Experimental/pathology
- Diabetes Mellitus, Experimental/physiopathology
- Diabetes Mellitus, Type 2/blood
- Diabetes Mellitus, Type 2/etiology
- Diabetes Mellitus, Type 2/metabolism
- Diabetes Mellitus, Type 2/pathology
- Female
- Fetal Development
- Gene Expression Regulation, Developmental
- Glucose Intolerance/blood
- Glucose Intolerance/etiology
- Glucose Intolerance/metabolism
- Glucose Intolerance/pathology
- Insulin Resistance
- Insulin-Secreting Cells/metabolism
- Insulin-Secreting Cells/pathology
- Liver/embryology
- Liver/metabolism
- Male
- Maternal Inheritance
- Mitochondrial Dynamics
- Muscle, Skeletal/embryology
- Muscle, Skeletal/metabolism
- Organelle Biogenesis
- Oxidative Stress
- Pancreas/embryology
- Pancreas/metabolism
- Pancreas/pathology
- Pregnancy
- Pregnancy Complications/blood
- Pregnancy Complications/metabolism
- Pregnancy Complications/pathology
- Pregnancy Complications/physiopathology
- Rats, Wistar
- Streptozocin
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Affiliation(s)
- Mervat Y Hanafi
- Department of Biochemistry, Medical Research Institute, Alexandria University, 165 Elhorreya, Avenue, P.O. Box 21561, Alexandria, Egypt
| | - Taha M Abdelkhalek
- Department of Human Genetics, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Mohamed I Saad
- Department of Biochemistry, Medical Research Institute, Alexandria University, 165 Elhorreya, Avenue, P.O. Box 21561, Alexandria, Egypt.
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Melbourne, Victoria, Australia.
| | - Moustafa M Saleh
- Department of Human Genetics, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Maha M Haiba
- Department of Biochemistry, Medical Research Institute, Alexandria University, 165 Elhorreya, Avenue, P.O. Box 21561, Alexandria, Egypt
| | - Maher A Kamel
- Department of Biochemistry, Medical Research Institute, Alexandria University, 165 Elhorreya, Avenue, P.O. Box 21561, Alexandria, Egypt
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15
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Yoon CY, Park JT, Kee YK, Han SG, Han IM, Kwon YE, Park KS, Lee MJ, Han SH, Kang SW, Yoo TH. Low Mitochondrial DNA Copy Number is Associated With Adverse Clinical Outcomes in Peritoneal Dialysis Patients. Medicine (Baltimore) 2016; 95:e2717. [PMID: 26886611 PMCID: PMC4998611 DOI: 10.1097/md.0000000000002717] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Mitochondrial dysfunction may play an important role in abnormal glucose metabolism and systemic inflammation. We aimed to investigate the relationship between mitochondrial DNA (mtDNA) copy number and clinical outcomes in peritoneal dialysis (PD) patients. We recruited 120 prevalent PD patients and determined mtDNA copy number by PCR. Primary outcome was all-cause mortality, whereas secondary outcomes included cardiovascular events, technical PD failure, and incident malignancy. Cox proportional hazards analysis determined the independent association of mtDNA copy number with outcomes. The mean patient age was 52.3 years; 42.5% were men. The mean log mtDNA copy number was 3.30 ± 0.50. During a follow-up period of 35.4 ± 19.3 months, all-cause mortality and secondary outcomes were observed in 20.0% and 59.2% of patients, respectively. Secondary outcomes were significantly lower in the highest mtDNA copy number group than in the lower groups. In multiple Cox analysis, the mtDNA copy number was not associated with all-cause mortality (lower two vs highest tertile: hazard ratio [HR] = 1.208, 95% confidence interval [CI] = 0.477-3.061). However, the highest tertile group was significantly associated with lower incidences of secondary outcomes (lower two vs highest tertile: HR [95% CI] = 0.494 [0.277-0.882]) after adjusting for confounding factors. The decreased mtDNA copy number was significantly associated with adverse clinical outcomes in PD patients.
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Affiliation(s)
- Chang-Yun Yoon
- From the Department of Internal Medicine (C-YY, JTP, YKK, SGH, IMH, YEK, KSP, MJL, SHH, S-WK, T-HY), Yonsei University College of Medicine; and Severance Biomedical Science Institute (S-WK, T-HY), Brain Korea 21 PLUS, Yonsei University College of Medicine, Seoul, Korea
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16
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Bersani FS, Morley C, Lindqvist D, Epel ES, Picard M, Yehuda R, Flory J, Bierer LM, Makotkine I, Abu-Amara D, Coy M, Reus VI, Lin J, Blackburn EH, Marmar C, Wolkowitz OM, Mellon SH. Mitochondrial DNA copy number is reduced in male combat veterans with PTSD. Prog Neuropsychopharmacol Biol Psychiatry 2016; 64:10-7. [PMID: 26120081 DOI: 10.1016/j.pnpbp.2015.06.012] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 06/21/2015] [Accepted: 06/23/2015] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Mitochondrial abnormalities may be involved in PTSD, although few studies have examined this. Mitochondrial DNA copy number (mtDNAcn) in blood cells is an emerging systemic index of mitochondrial biogenesis and function. The present study assessed mtDNAcn in male combat-exposed veterans with PTSD compared to those without PTSD as well as its correlation with clinical scales. METHODS mtDNAcn was assessed with a TaqMan multiplex assay in granulocytes of 43 male combat veterans with (n=43) or without (n=44) PTSD. Twenty of the PTSD subjects had co-morbid major depressive disorder (MDD). The Clinician Administered PTSD Scale (CAPS), the Positive and Negative Affect Schedule (PANAS), the Early Trauma Inventory (ETI) and the Beck Depression Inventory II (BDI-II) were used for the clinical assessments. All analyses were corrected for age and BMI. RESULTS mtDNAcn was significantly lower in subjects with PTSD (p<0.05). Within the PTSD group, those with moderate PTSD symptom severity had relatively higher mtDNAcn than those with mild or severe symptoms (p<0.01). Within the PTSD group, mtDNAcn was positively correlated with PANAS positive subscale ratings (p<0.01) but was not significantly correlated with PANAS negative subscale, ETI or BDI-II ratings. DISCUSSION This study provides the first evidence of: (i) a significant decrease of mtDNAcn in combat PTSD, (ii) a possible "inverted-U" shaped relationship between PTSD symptom severity and mtDNAcn within PTSD subjects, and (iii) a direct correlation of mtDNAcn with positive affectivity within PTSD subjects. Altered mtDNAcn in PTSD may reflect impaired energy metabolism, which might represent a novel aspect of its pathophysiology.
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Affiliation(s)
- Francesco Saverio Bersani
- Department of Psychiatry, University of California San Francisco, San Francisco, CA, USA; Department of Neurology and Psychiatry, Sapienza University of Rome, Rome, Italy
| | - Claire Morley
- Department of Psychiatry, University of California San Francisco, San Francisco, CA, USA
| | - Daniel Lindqvist
- Department of Psychiatry, University of California San Francisco, San Francisco, CA, USA; Department of Clinical Sciences, Section for Psychiatry, Lund University, Lund, Sweden
| | - Elissa S Epel
- Department of Psychiatry, University of California San Francisco, San Francisco, CA, USA; Center for Health and Community, University of California San Francisco, San Francisco, CA, USA
| | - Martin Picard
- Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia and University of Pennsylvania, Philadelphia, PA, USA
| | - Rachel Yehuda
- Department of Psychiatry, MSSM/James J. Peters Veterans Administration Medical Center, New York, NY, USA
| | - Janine Flory
- Department of Psychiatry, MSSM/James J. Peters Veterans Administration Medical Center, New York, NY, USA
| | - Linda M Bierer
- Department of Psychiatry, MSSM/James J. Peters Veterans Administration Medical Center, New York, NY, USA
| | - Iouri Makotkine
- Department of Psychiatry, MSSM/James J. Peters Veterans Administration Medical Center, New York, NY, USA
| | - Duna Abu-Amara
- Department of Psychiatry, Steven and Alexandra Cohen Veterans Center for Posttraumatic Stress and Traumatic Brain Injury, New York, NY, USA
| | - Michelle Coy
- Department of Psychiatry, University of California San Francisco, San Francisco, CA, USA
| | - Victor I Reus
- Department of Psychiatry, University of California San Francisco, San Francisco, CA, USA
| | - Jue Lin
- Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, CA, USA
| | - Elizabeth H Blackburn
- Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, CA, USA
| | - Charles Marmar
- Department of Psychiatry, Steven and Alexandra Cohen Veterans Center for Posttraumatic Stress and Traumatic Brain Injury, New York, NY, USA
| | - Owen M Wolkowitz
- Department of Psychiatry, University of California San Francisco, San Francisco, CA, USA.
| | - Synthia H Mellon
- Department of OB/GYN and Reproductive Science, University of California San Francisco, San Francisco, CA, USA
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17
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Hanafi MY, Saleh MM, Saad MI, Abdelkhalek TM, Kamel MA. Transgenerational effects of obesity and malnourishment on diabetes risk in F2 generation. Mol Cell Biochem 2015; 412:269-80. [PMID: 26708218 DOI: 10.1007/s11010-015-2633-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 12/15/2015] [Indexed: 01/19/2023]
Abstract
Transgenerational inheritance of various diseases and phenotypes has been demonstrated in diverse species and involves various epigenetic markers. Obesity and malnourishment are nutritional stresses that have effects on offspring through increasing their risk of diabetes and/or obesity. Obesity and malnourishment both affect glucose metabolism and alter oxidative stress parameters in key organs. We induced obesity and malnutrition in F0 female rats by the use of obesogenic diet and protein-deficient diet, respectively. F0 obese and malnourished females were mated with control males and their offspring (F1 generation) were maintained on control diets. The male and female F1 offspring were mated with controls and the resultant offspring (F2 generation) were maintained on control diet. Glucose-sensing markers, glucose metabolism, indicators of insulin resistance and oxidative stress parameters were assessed during fetal development and till the adulthood of the offspring. Glucose-sensing genes were significantly over-expressed in distinct fetal tissues of F2 offspring of malnourished F1 females (F2-MF1F), specifically in fetal pancreas, liver, and adipose tissue. Nuclear and mitochondrial 8-oxo-dG DNA content was significantly elevated in F2-MF1F fetal pancreas. Maternal FBG was significantly elevated in F2-MF1F and F2 offspring of obese F1 females (F2-OF1F) during pregnancy. Males and females offspring of F2-OF1 exhibited significantly elevated FBG and impaired OGTT. Offspring of F2-MF1F showed similar results, while that of F2-MF1M did not significantly deviate from controls. F2-OF1F and F2-MF1F offspring exhibited significant deviation in insulin levels and HOMA-IR levels from controls. Malnourishment has a stronger transgenerational effect through maternal line compared to obesity and malnourishment through paternal line in increasing risk of diabetes in F2 generation.
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Affiliation(s)
- Mervat Y Hanafi
- Department of Biochemistry, Medical Research Institute, Alexandria University, 165 Elhorreya Avenue, P.O. Box 21561, Alexandria, Egypt
| | - Moustafa M Saleh
- Department of Human Genetics, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Mohamed I Saad
- Department of Biochemistry, Medical Research Institute, Alexandria University, 165 Elhorreya Avenue, P.O. Box 21561, Alexandria, Egypt.
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Melbourne, VIC, Australia.
| | - Taha M Abdelkhalek
- Department of Human Genetics, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Maher A Kamel
- Department of Biochemistry, Medical Research Institute, Alexandria University, 165 Elhorreya Avenue, P.O. Box 21561, Alexandria, Egypt
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18
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Guo W, Zheng B, Guo D, Cai Z, Wang Y. Association of AluYb8 insertion/deletion polymorphism in the MUTYH gene with mtDNA maintain in the type 2 diabetes mellitus patients. Mol Cell Endocrinol 2015; 409:33-40. [PMID: 25829257 DOI: 10.1016/j.mce.2015.03.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 03/16/2015] [Accepted: 03/23/2015] [Indexed: 12/15/2022]
Abstract
A common AluYb8-element insertion/deletion polymorphism of the MUTYH gene (AluYb8MUTYH) is a novel genetic risk factor for type 2 diabetes mellitus (T2DM). In the present study, mtDNA sequencing analysis indicated that the mtDNA sequence heteroplasmy was not associated with AluYb8MUTYH polymorphism. To better understand the genetic risk for T2DM, we investigated the association of this polymorphism with mtDNA content, mtDNA breakage and mtDNA transcription in the leukocytes of T2DM patients. The mtDNA content and unbroken mtDNA were significantly increased in the mutant patients than in the wild-type patients (P <0.05, respectively). However, no association between mtDNA transcription and AluYb8MUTYH variant was observed. The results suggested that the AluYb8MUTYH variant was associated with an altered mtDNA maintain in T2DM patients. The high level of mtDNA content observed in the mutant patients may have resulted from inefficient base excision repair of mitochondrial MUTYH and a compensatory mechanism that is triggered by elevated oxidative stress.
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Affiliation(s)
- Wenwen Guo
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China; Department of Medical Genetics, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China; Clinical Molecular Diagnostic Center, Second Hospital, Nanjing Medical University, No.121 Jiangjiayuan Road, Nanjing 210011, China
| | - Bixia Zheng
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China; Department of Medical Genetics, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China
| | - Dong Guo
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China; Department of Medical Genetics, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China
| | - Zhenming Cai
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China; Department of Medical Genetics, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China
| | - Yaping Wang
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China; Department of Medical Genetics, Nanjing University School of Medicine, No.22 HanKou Road, Nanjing 210093, China.
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19
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Pieters N, Janssen BG, Valeri L, Cox B, Cuypers A, Dewitte H, Plusquin M, Smeets K, Nawrot TS. Molecular responses in the telomere-mitochondrial axis of ageing in the elderly: a candidate gene approach. Mech Ageing Dev 2015; 145:51-7. [PMID: 25736869 DOI: 10.1016/j.mad.2015.02.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 01/22/2015] [Accepted: 02/27/2015] [Indexed: 11/18/2022]
Abstract
Experimental evidence shows that telomere shortening induces mitochondrial damage but so far studies in humans are scarce. Here, we investigated the association between leukocyte telomere length (LTL) and mitochondrial DNA (mtDNA) content in elderly and explored possible intermediate mechanisms by determining the gene expression profile of candidate genes in the telomere-mitochondrial axis of ageing. Among 166 non-smoking elderly, LTL, leukocyte mtDNA content and expression of candidate genes: sirtuin1 (SIRT1), tumor protein p53 (TP53), peroxisome proliferator-activated receptor γ-coactivator1α (PGC-1α), peroxisome proliferator-activated receptor γ-coactivator1β (PGC-1β), nuclear respiratory factor 1 (NRF1) and nuclear factor, erythroid 2 like 2 (NRF2), using a quantitave real time polymerase chain assay (qPCR). Statistical mediation analysis was used to study intermediate mechanisms of the telomere-mitochondrial axis of ageing. LTL correlated with leukocyte mtDNA content in our studied elderly (r = 0.23, p = 0.0047). SIRT1 gene expression correlated positively with LTL (r = 0.26, p = 0.0094) and leukocyte mtDNA content (r = 0.43, p < 0.0001). The other studied candidates showed significant correlations in the telomere-mitochondrial interactome but not independent from SIRT1. SIRT1 gene expression was estimated to mediate 40% of the positive association between LTL and leukocyte mtDNA content. The key finding of our study was that SIRT1 expression plays a pivotal role in the telomere-mitochondrial interactome.
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Affiliation(s)
- Nicky Pieters
- Centre for Environmental Sciences, Hasselt University, Agoralaan Gebouw D Diepenbeek, Belgium
| | - Bram G Janssen
- Centre for Environmental Sciences, Hasselt University, Agoralaan Gebouw D Diepenbeek, Belgium
| | - Linda Valeri
- Department of Biostatistics, School of Public Health, Harvard University, 655 Huntington Avenue, Boston, MA, USA
| | - Bianca Cox
- Centre for Environmental Sciences, Hasselt University, Agoralaan Gebouw D Diepenbeek, Belgium
| | - Ann Cuypers
- Centre for Environmental Sciences, Hasselt University, Agoralaan Gebouw D Diepenbeek, Belgium
| | - Harrie Dewitte
- Primary Health Care Centre GVHV, Keinkesstraat 3a, Genk, Belgium
| | - Michelle Plusquin
- Centre for Environmental Sciences, Hasselt University, Agoralaan Gebouw D Diepenbeek, Belgium
| | - Karen Smeets
- Centre for Environmental Sciences, Hasselt University, Agoralaan Gebouw D Diepenbeek, Belgium
| | - Tim S Nawrot
- Centre for Environmental Sciences, Hasselt University, Agoralaan Gebouw D Diepenbeek, Belgium; Department of Public Health, Occupational & Environmental Medicine, Herestraat 49, Leuven, Belgium.
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20
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Audano M, Ferrari A, Fiorino E, Kuenzl M, Caruso D, Mitro N, Crestani M, De Fabiani E. Energizing Genetics and Epi-genetics: Role in the Regulation of Mitochondrial Function. Curr Genomics 2015; 15:436-56. [PMID: 25646072 PMCID: PMC4311388 DOI: 10.2174/138920291506150106151119] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 11/11/2014] [Accepted: 11/18/2014] [Indexed: 12/15/2022] Open
Abstract
Energy metabolism and mitochondrial function hold a core position in cellular homeostasis. Oxidative metabolism is regulated at multiple levels, ranging from gene transcription to allosteric modulation. To accomplish the fine tuning of these multiple regulatory circuits, the nuclear and mitochondrial compartments are tightly and reciprocally controlled. The fact that nuclear encoded factors, PPARγ coactivator 1α and mitochondrial transcription factor A, play pivotal roles in the regulation of oxidative metabolism and mitochondrial biogenesis is paradigmatic of this crosstalk. Here we provide an updated survey of the genetic and epigenetic mechanisms involved in the control of energy metabolism and mitochondrial function. Chromatin dynamics highly depends on post-translational modifications occurring at specific amino acids in histone proteins and other factors associated to nuclear DNA. In addition to the well characterized enzymes responsible for histone methylation/demethylation and acetylation/deacetylation, other factors have gone on the "metabolic stage". This is the case of the new class of α-ketoglutarate-regulated demethylases (Jumonji C domain containing demethylases) and of the NAD+-dependent deacetylases, also known as sirtuins. Moreover, unexpected features of the machineries involved in mitochondrial DNA (mtDNA) replication and transcription, mitochondrial RNA processing and maturation have recently emerged. Mutations or defects of any component of these machineries profoundly affect mitochondrial activity and oxidative metabolism. Finally, recent evidences support the importance of mtDNA packaging in replication and transcription. These observations, along with the discovery that non-classical CpG islands present in mtDNA undergo methylation, indicate that epigenetics also plays a role in the regulation of the mitochondrial genome function.
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Affiliation(s)
- Matteo Audano
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Italy
| | - Alessandra Ferrari
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Italy
| | - Erika Fiorino
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Italy
| | - Martin Kuenzl
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Italy
| | - Donatella Caruso
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Italy
| | - Nico Mitro
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Italy
| | - Maurizio Crestani
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Italy
| | - Emma De Fabiani
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Italy
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Stammers AN, Susser SE, Hamm NC, Hlynsky MW, Kimber DE, Kehler DS, Duhamel TA. The regulation of sarco(endo)plasmic reticulum calcium-ATPases (SERCA). Can J Physiol Pharmacol 2015; 93:843-54. [PMID: 25730320 DOI: 10.1139/cjpp-2014-0463] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The sarco(endo)plasmic reticulum calcium ATPase (SERCA) is responsible for transporting calcium (Ca(2+)) from the cytosol into the lumen of the sarcoplasmic reticulum (SR) following muscular contraction. The Ca(2+) sequestering activity of SERCA facilitates muscular relaxation in both cardiac and skeletal muscle. There are more than 10 distinct isoforms of SERCA expressed in different tissues. SERCA2a is the primary isoform expressed in cardiac tissue, whereas SERCA1a is the predominant isoform expressed in fast-twitch skeletal muscle. The Ca(2+) sequestering activity of SERCA is regulated at the level of protein content and is further modified by the endogenous proteins phospholamban (PLN) and sarcolipin (SLN). Additionally, several novel mechanisms, including post-translational modifications and microRNAs (miRNAs) are emerging as integral regulators of Ca(2+) transport activity. These regulatory mechanisms are clinically relevant, as dysregulated SERCA function has been implicated in the pathology of several disease states, including heart failure. Currently, several clinical trials are underway that utilize novel therapeutic approaches to restore SERCA2a activity in humans. The purpose of this review is to examine the regulatory mechanisms of the SERCA pump, with a particular emphasis on the influence of exercise in preventing the pathological conditions associated with impaired SERCA function.
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Affiliation(s)
- Andrew N Stammers
- a Health, Leisure & Human Performance Research Institute, Faculty of Kinesiology & Recreation Management, University of Manitoba.,b Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre
| | - Shanel E Susser
- b Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre.,c Department of Physiology, Faculty of Health Sciences, University of Manitoba
| | - Naomi C Hamm
- a Health, Leisure & Human Performance Research Institute, Faculty of Kinesiology & Recreation Management, University of Manitoba.,b Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre
| | - Michael W Hlynsky
- a Health, Leisure & Human Performance Research Institute, Faculty of Kinesiology & Recreation Management, University of Manitoba.,b Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre
| | - Dustin E Kimber
- a Health, Leisure & Human Performance Research Institute, Faculty of Kinesiology & Recreation Management, University of Manitoba.,b Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre
| | - D Scott Kehler
- a Health, Leisure & Human Performance Research Institute, Faculty of Kinesiology & Recreation Management, University of Manitoba.,b Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre
| | - Todd A Duhamel
- a Health, Leisure & Human Performance Research Institute, Faculty of Kinesiology & Recreation Management, University of Manitoba.,b Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre.,c Department of Physiology, Faculty of Health Sciences, University of Manitoba
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22
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Xu Y, Lu S. Transforming growth factor-β1-induced epithelial to mesenchymal transition increases mitochondrial content in the A549 non-small cell lung cancer cell line. Mol Med Rep 2014; 11:417-21. [PMID: 25323156 DOI: 10.3892/mmr.2014.2678] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 07/30/2014] [Indexed: 11/06/2022] Open
Abstract
The mitochondrial genome DNA copy number is critical for the functional maintenance of the mitochondria and energy acquisition for cell metabolism. Epithelial to mesenchymal transition (EMT) is an important process during embryonic development and has also been hypothesized to exhibit a significant role in cancer cell invasion and metastasis. In the present study, EMT was induced in the A549 non-small cell lung cancer (NSCLC) cell line, using transforming growth factor-β1 (TGF-β1) and changes in mitochondrial content, mitochondrial DNA (mtDNA) copy number and protein cytochrome c (Cyt c) were determined by reverse transcription-quantitative polymerase chain reaction and western blot analysis, respectively. mtDNA copy number and Cyt c protein levels were observed to increase following the induction of EMT in NSCLC cells. Results of the current study indicate that energy metabolism is adapted to facilitate EMT in NSCLC cells.
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Affiliation(s)
- Yunhua Xu
- Shanghai Lung Cancer Center, Shanghai Chest Hospital, Shanghai Jiaotong University, Shanghai 200030, P.R. China
| | - Shun Lu
- Shanghai Lung Cancer Center, Shanghai Chest Hospital, Shanghai Jiaotong University, Shanghai 200030, P.R. China
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23
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He Y, Tang J, Li Z, Li H, Liao Y, Tang Y, Tan L, Chen J, Xia K, Chen X. Leukocyte mitochondrial DNA copy number in blood is not associated with major depressive disorder in young adults. PLoS One 2014; 9:e96869. [PMID: 24809340 PMCID: PMC4014566 DOI: 10.1371/journal.pone.0096869] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 04/12/2014] [Indexed: 01/02/2023] Open
Abstract
Background Major depressive disorder (MDD) is the leading cause of disability worldwide, and has significant genetic predisposition. Mitochondria may have a role in MDD and so mitochondrial DNA (mtDNA) has been suggested as a possible biomarker for this disease. We aimed to test whether the mtDNA copy number of peripheral blood leukocytes is related to MDD in young adults. Methods A case-control study was conducted with 210 MDD patients and 217 healthy controls (HC). The mtDNA copy number was measured by quantitative polymerase chain reaction (qPCR) method. Depression severity was assessed by the Hamilton-17 Depression Rating Scale (HDRS-17). Results We found no significant differences in mtDNA copy number between MDD patients and HC, though the power analysis showed that our sample size has enough power to detect the difference. There were also no significant correlations between mtDNA copy number and the clinical characteristics (such as age, age of onset, episodes, Hamilton Depression Rating Scale (HDRS) score and Global Assessment of Function Scale (GAF) score) in MDD patients. Conclusion Our study suggests that leukocyte mtDNA copy number is unlikely to contribute to MDD, but it doesn’t mean that we can exclude the possibility of involvement of mitochondria in the disease. Further studies are required to elucidate whether mtDNA can be a biomarker of MDD.
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Affiliation(s)
- Ying He
- Institute of Mental Health, the Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Jinsong Tang
- Institute of Mental Health, the Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Zongchang Li
- Institute of Genomic Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Hong Li
- Institute of Mental Health, the Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Yanhui Liao
- Institute of Mental Health, the Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Yanqing Tang
- Department of Psychiatry, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, China
| | - Liwen Tan
- Institute of Mental Health, the Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Jindong Chen
- Institute of Mental Health, the Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Kun Xia
- The State Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, China
| | - Xiaogang Chen
- Institute of Mental Health, the Second Xiangya Hospital of Central South University, Changsha, Hunan, China; The State Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, China; Key Laboratory of Psychiatry and Mental Health of Hunan Province, Central South University, Changsha, Hunan, China; The State Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, China
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Shi CM, Xu GF, Yang L, Fu ZY, Chen L, Fu HL, Shen YH, Zhu L, Ji CB, Guo XR. Overexpression of TFAM protects 3T3-L1 adipocytes from NYGGF4 (PID1) overexpression-induced insulin resistance and mitochondrial dysfunction. Cell Biochem Biophys 2014; 66:489-97. [PMID: 23274913 DOI: 10.1007/s12013-012-9496-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
NYGGF4, also known as phosphotyrosine interaction domain containing 1(PID1), is a recently discovered gene which is involved in obesity-related insulin resistance (IR) and mitochondrial dysfunction. We aimed to further elucidate the effects and mechanisms underlying NYGGF4-induced IR by investigating the effect of overexpressing mitochondrial transcription factor A (TFAM), which is essential for mitochondrial DNA transcription and replication, on NYGGF4-induced IR and mitochondrial abnormalities in 3T3-L1 adipocytes. Overexpression of TFAM increased the mitochondrial copy number and ATP content in both control 3T3-L1 adipocytes and NYGGF4-overexpressing adipocytes. Reactive oxygen species (ROS) production was enhanced in NYGGF4-overexpressing adipocytes and reduced in TFAM-overexpressing adipocytes; co-overexpression of TFAM significantly attenuated ROS production in NYGGF4-overexpressing adipocytes. However, overexpression of TFAM did not affect the mitochondrial transmembrane potential (ΔΨm) in control 3T3-L1 adipocytes or NYGGF4-overexpressing adipocytes. In addition, co-overexpression of TFAM-enhanced insulin-stimulated glucose uptake by increasing Glucose transporter type 4 (GLUT4) translocation to the PM in NYGGF4-overexpressing adipocytes. Overexpression of NYGGF4 significantly inhibited tyrosine phosphorylation of Insulin receptor substrate 1 (IRS-1) and serine phosphorylation of Akt, whereas overexpression of TFAM strongly induced phosphorylation of IRS-1 and Akt in NYGGF4-overexpressing adipocytes. This study demonstrates that NYGGF4 plays a role in IR by impairing mitochondrial function, and that overexpression of TFAM can restore mitochondrial function to normal levels in NYGGF4-overexpressing adipocytes via activation of the IRS-1/PI3K/Akt signaling pathway.
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Affiliation(s)
- Chun-Mei Shi
- State Key Laboratory of Reproductive Medicine, Department of Pediatrics, Nanjing Maternity and Child Health Hospital Affiliated to Nanjing Medical University, Nanjing, China
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25
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Abstract
The growing epidemic of type 2 diabetes mellitus (T2DM) and obesity is largely attributed to the current lifestyle of over-consumption and physical inactivity. As the primary platform controlling metabolic and energy homeostasis, mitochondria show aberrant changes in T2DM and obese subjects. While the underlying mechanism is under extensive investigation, epigenetic regulation is now emerging to play an important role in mitochondrial biogenesis, function, and dynamics. In line with lifestyle modifications preventing mitochondrial alterations and metabolic disorders, exercise has been shown to change DNA methylation of the promoter of PGC1α to favor gene expression responsible for mitochondrial biogenesis and function. In this article we discuss the epigenetic mechanism of mitochondrial alteration in T2DM and obesity, and the effects of lifestyle on epigenetic regulation. Future studies designed to further explore and integrate the epigenetic mechanisms with lifestyle modification may lead to interdisciplinary interventions and novel preventive options for mitochondrial alteration and metabolic disorders.
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Affiliation(s)
- Zhiyong Cheng
- Department of Human Nutrition, Foods, and Exercise; Fralin Translational Obesity Research Center; Fralin Life Science Institute; College of Agriculture and Life Sciences; Virginia Tech; Blacksburg, VA USA
| | - Fabio A Almeida
- Department of Human Nutrition, Foods, and Exercise; Fralin Translational Obesity Research Center; Fralin Life Science Institute; College of Agriculture and Life Sciences; Virginia Tech; Blacksburg, VA USA
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26
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Barańska S, Glinkowska M, Herman-Antosiewicz A, Maciąg-Dorszyńska M, Nowicki D, Szalewska-Pałasz A, Węgrzyn A, Węgrzyn G. Replicating DNA by cell factories: roles of central carbon metabolism and transcription in the control of DNA replication in microbes, and implications for understanding this process in human cells. Microb Cell Fact 2013; 12:55. [PMID: 23714207 PMCID: PMC3698200 DOI: 10.1186/1475-2859-12-55] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 05/26/2013] [Indexed: 12/29/2022] Open
Abstract
Precise regulation of DNA replication is necessary to ensure the inheritance of genetic features by daughter cells after each cell division. Therefore, determining how the regulatory processes operate to control DNA replication is crucial to our understanding and application to biotechnological processes. Contrary to early concepts of DNA replication, it appears that this process is operated by large, stationary nucleoprotein complexes, called replication factories, rather than by single enzymes trafficking along template molecules. Recent discoveries indicated that in bacterial cells two processes, central carbon metabolism (CCM) and transcription, significantly and specifically influence the control of DNA replication of various replicons. The impact of these discoveries on our understanding of the regulation of DNA synthesis is discussed in this review. It appears that CCM may influence DNA replication by either action of specific metabolites or moonlighting activities of some enzymes involved in this metabolic pathway. The role of transcription in the control of DNA replication may arise from either topological changes in nucleic acids which accompany RNA synthesis or direct interactions between replication and transcription machineries. Due to intriguing similarities between some prokaryotic and eukaryotic regulatory systems, possible implications of studies on regulation of microbial DNA replication on understanding such a process occurring in human cells are discussed.
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Affiliation(s)
- Sylwia Barańska
- Department of Molecular Biology, University of Gdańsk, Wita Stwosza 59, Gdańsk 80-308, Poland
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27
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Pieters N, Koppen G, Smeets K, Napierska D, Plusquin M, De Prins S, Van De Weghe H, Nelen V, Cox B, Cuypers A, Hoet P, Schoeters G, Nawrot TS. Decreased mitochondrial DNA content in association with exposure to polycyclic aromatic hydrocarbons in house dust during wintertime: from a population enquiry to cell culture. PLoS One 2013; 8:e63208. [PMID: 23658810 PMCID: PMC3643917 DOI: 10.1371/journal.pone.0063208] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Accepted: 04/02/2013] [Indexed: 01/05/2023] Open
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are widespread environmental pollutants that are formed in combustion processes. At the cellular level, exposure to PAHs causes oxidative stress and/or some of it congeners bind to DNA, which may interact with mitochondrial function. However, the influence of these pollutants on mitochondrial DNA (mtDNA) content remains largely unknown. We determined whether indoor exposure to PAHs is associated with mitochondrial damage as represented by blood mtDNA content. Blood mtDNA content (ratio mitochondrial/nuclear DNA copy number) was determined by real-time qPCR in 46 persons, both in winter and summer. Indoor PAH exposure was estimated by measuring PAHs in sedimented house dust, including 6 volatile PAHs and 8 non-volatile PAHs. Biomarkers of oxidative stress at the level of DNA and lipid peroxidation were measured. In addition to the epidemiologic enquiry, we exposed human TK6 cells during 24 h at various concentrations (range: 0 to 500 µM) of benzo(a)pyrene and determined mtDNA content. Mean blood mtDNA content averaged (±SD) 0.95±0.185. The median PAH content amounted 554.1 ng/g dust (25th–75th percentile: 390.7–767.3) and 1385ng/g dust (25th–75th percentile: 1000–1980) in winter for volatile and non-volatile PAHs respectively. Independent for gender, age, BMI and the consumption of grilled meat or fish, blood mtDNA content decreased by 9.85% (95% CI: −15.16 to −4.2; p = 0.002) for each doubling of non-volatile PAH content in the house dust in winter. The corresponding estimate for volatile PAHs was −7.3% (95% CI: −13.71 to −0.42; p = 0.04). Measurements of oxidative stress were not correlated with PAH exposure. During summer months no association was found between mtDNA content and PAH concentration. The ability of benzo(a)pyrene (range 0 µM to 500 µM) to lower mtDNA content was confirmed in vitro in human TK6 cells. Based on these findings, mtDNA content can be a target of PAH toxicity in humans.
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Affiliation(s)
- Nicky Pieters
- Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Gudrun Koppen
- Environmental Risk & Health Unit, VITO (Flemish Institute of Technological Research), Mol, Belgium
| | - Karen Smeets
- Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Dorota Napierska
- Department of Public Health & Primary Care, Occupational & Environmental Medicine, Leuven University (KU Leuven), Leuven, Belgium
| | - Michelle Plusquin
- Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Sofie De Prins
- Environmental Risk & Health Unit, VITO (Flemish Institute of Technological Research), Mol, Belgium
- Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - Hendrik Van De Weghe
- Environmental Risk & Health Unit, VITO (Flemish Institute of Technological Research), Mol, Belgium
| | - Vera Nelen
- Environment and Health Unit, Provincial Institute of Hygiene, Antwerp, Belgium
| | - Bianca Cox
- Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Ann Cuypers
- Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Peter Hoet
- Department of Public Health & Primary Care, Occupational & Environmental Medicine, Leuven University (KU Leuven), Leuven, Belgium
| | - Greet Schoeters
- Environmental Risk & Health Unit, VITO (Flemish Institute of Technological Research), Mol, Belgium
- Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - Tim S. Nawrot
- Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
- Department of Public Health & Primary Care, Occupational & Environmental Medicine, Leuven University (KU Leuven), Leuven, Belgium
- * E-mail:
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Teodoro JS, Rolo AP, Palmeira CM. The NAD ratio redox paradox: why does too much reductive power cause oxidative stress? Toxicol Mech Methods 2013; 23:297-302. [PMID: 23256455 DOI: 10.3109/15376516.2012.759305] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The reductive power provided by nicotinamide adenine dinucleotides is invaluable for several cellular processes. It drives metabolic reactions, enzymatic activity, regulates genetic expression and allows for the maintenance of a normal cell redox status. Therefore, the balance between the oxidized (NAD(+)) and the reduced (NADH) forms is critical for the cell's proper function and ultimately, for its survival. Being intimately associated with the cells' metabolism, it is expected that alterations to the NAD(+)/NADH ratio are to be found in situations of metabolic diseases, as is the case of diabetes. NAD(+) is a necessary cofactor for several enzymes' activity, many of which are related to metabolism. Therefore, a decrease in the NAD(+)/NADH ratio causes these enzymes to decrease in activity (reductive stress), resulting in an altered metabolic situation that might be the first insult toward several pathologies, such as diabetes. Here, we review the importance of nicotinamide adenine dinucleotides in the liver cell and its fluctuations in a state of type 2 diabetes mellitus.
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Affiliation(s)
- João Soeiro Teodoro
- Center for Neurosciences and Cell Biology, Department of Life Sciences of the University of Coimbra , Coimbra , Portugal
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29
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Zhang H, Chen P, Zeng H, Zhang Y, Peng H, Chen Y, He Z. Protective Effect of Demethylation Treatment on Cigarette Smoke Extract–Induced Mouse Emphysema Model. J Pharmacol Sci 2013; 123:159-66. [DOI: 10.1254/jphs.13072fp] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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30
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Janssen BG, Munters E, Pieters N, Smeets K, Cox B, Cuypers A, Fierens F, Penders J, Vangronsveld J, Gyselaers W, Nawrot TS. Placental mitochondrial DNA content and particulate air pollution during in utero life. ENVIRONMENTAL HEALTH PERSPECTIVES 2012; 120:1346-52. [PMID: 22626541 PMCID: PMC3440109 DOI: 10.1289/ehp.1104458] [Citation(s) in RCA: 182] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Accepted: 05/24/2012] [Indexed: 05/19/2023]
Abstract
BACKGROUND Studies emphasize the importance of particulate matter (PM) in the formation of reactive oxygen species and inflammation. We hypothesized that these processes can influence mitochondrial function of the placenta and fetus. OBJECTIVE We investigated the influence of PM₁₀ exposure during pregnancy on the mitochondrial DNA content (mtDNA content) of the placenta and umbilical cord blood. METHODS DNA was extracted from placental tissue (n = 174) and umbilical cord leukocytes (n = 176). Relative mtDNA copy numbers (i.e., mtDNA content) were determined by real-time polymerase chain reaction. Multiple regression models were used to link mtDNA content and in utero exposure to PM₁₀ over various time windows during pregnancy. RESULTS In multivariate-adjusted analysis, a 10-µg/m³ increase in PM₁₀ exposure during the last month of pregnancy was associated with a 16.1% decrease [95% confidence interval (CI): -25.2, -6.0%, p = 0.003] in placental mtDNA content. The corresponding effect size for average PM₁₀ exposure during the third trimester was 17.4% (95% CI: -31.8, -0.1%, p = 0.05). Furthermore, we found that each doubling in residential distance to major roads was associated with an increase in placental mtDNA content of 4.0% (95% CI: 0.4, 7.8%, p = 0.03). No association was found between cord blood mtDNA content and PM₁₀ exposure. CONCLUSIONS Prenatal PM₁₀ exposure was associated with placental mitochondrial alterations, which may both reflect and intensify oxidative stress production. The potential health consequences of decreased placental mtDNA content in early life must be further elucidated.
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Affiliation(s)
- Bram G Janssen
- Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
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31
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Håkansson J, Eliasson B, Smith U, Enerbäck S. Adipocyte mitochondrial genes and the forkhead factor FOXC2 are decreased in type 2 diabetes patients and normalized in response to rosiglitazone. Diabetol Metab Syndr 2011; 3:32. [PMID: 22098677 PMCID: PMC3230127 DOI: 10.1186/1758-5996-3-32] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Accepted: 11/18/2011] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND FOXC2 has lately been implicated in diabetes and obesity as well as mitochondrial function and biogenesis and also as a regulator of mtTFA/Tfam. In this study, the expression of FOXC2 and selected genes involved in mitochondrial function and biogenesis in healthy subjects and in a matched cohort with type 2 diabetes patients before and after treatment with rosiglitazone was determined. Quantitative real time PCR was used to analyze both RNA and DNA from biopsies from subcutaneous adipose tissue. METHODS Blood samples and subcutaneous abdominal fat biopsies were collected from 12 T2D patients, of which 11 concluded the study, pre-treatment and 90 days after initiation of rosiglitazone treatment, and from 19 healthy control subjects on the first and only visit from healthy subjects. Clinical parameters were measured on the blood samples. RNA and DNA were prepared from the fat biopsies and gene expression was measured with real time PCR. RESULTS The expression level of genes in the mitochondrial respiratory complexes I - IV were significantly downregulated in the diabetic patients and restored in response to rosiglitazone treatment. Rosiglitazone treatment also increased the relative number of mitochondria in diabetic patients compared with controls. Furthermore, the transcription factors FOXC2 and mtTFA/Tfam displayed a response pattern identical to the mitochondrial genes. CONCLUSIONS FOXC2, mtTFA/Tfam and subunits of the respiratory complexes I - IV show equivalent regulation in gene expression levels in response to TZD treatment. This, together with the knowledge that FOXC2 has a regulatory function of mtTFA/Tfam and mitochondrial biogenesis, suggests that FOXC2 has a possible functional role in the TZD activated mitochondrial response.
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Affiliation(s)
- Joakim Håkansson
- Department of Medical and Clinical Genetics, Institute of Biomedicine University of Gothenburg, Göteborg, Sweden
- PharmaSurgics AB, Arvid Wallgrens backe 20, Göteborg, Sweden
| | - Björn Eliasson
- The Lundberg Laboratory for Diabetes Research, Department of Molecular and Clinical Medicine, The Sahlgrenska Academy at the University of Gothenburg, Göteborg, Sweden
| | - Ulf Smith
- The Lundberg Laboratory for Diabetes Research, Department of Molecular and Clinical Medicine, The Sahlgrenska Academy at the University of Gothenburg, Göteborg, Sweden
| | - Sven Enerbäck
- Department of Medical and Clinical Genetics, Institute of Biomedicine University of Gothenburg, Göteborg, Sweden
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Lidell ME, Seifert EL, Westergren R, Heglind M, Gowing A, Sukonina V, Arani Z, Itkonen P, Wallin S, Westberg F, Fernandez-Rodriguez J, Laakso M, Nilsson T, Peng XR, Harper ME, Enerbäck S. The adipocyte-expressed forkhead transcription factor Foxc2 regulates metabolism through altered mitochondrial function. Diabetes 2011; 60:427-35. [PMID: 21270254 PMCID: PMC3028341 DOI: 10.2337/db10-0409] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
OBJECTIVE Previous findings demonstrate that enhanced expression of the forkhead transcription factor Foxc2 in adipose tissue leads to a lean and insulin-sensitive phenotype. These findings prompted us to further investigate the role of Foxc2 in the regulation of genes of fundamental importance for metabolism and mitochondrial function. RESEARCH DESIGN AND METHODS The effects of Foxc2 on expression of genes involved in mitochondriogenesis and mitochondrial function were assessed by quantitative real-time PCR. The potential of a direct transcriptional regulation of regulated genes was tested in promoter assays, and mitochondrial morphology was investigated by electron microscopy. Mitochondrial function was tested by measuring oxygen consumption and extracellular acidification rates as well as palmitate oxidation. RESULTS Enhanced expression of FOXC2 in adipocytes or in cells with no endogenous Foxc2 expression induces mitochondriogenesis and an elongated mitochondrial morphology. Together with increased aerobic metabolic capacity, increased palmitate oxidation, and upregulation of genes encoding respiratory complexes and of brown fat-related genes, Foxc2 also specifically induces mitochondrial fusion genes in adipocytes. Among tested forkhead genes, Foxc2 is unique in its ability to trans-activate the nuclear-encoded mitochondrial transcription factor A (mtTFA/Tfam) gene--a master regulator of mitochondrial biogenesis. In human adipose tissue the expression levels of mtTFA/Tfam and of fusion genes also correlate with that of Foxc2. CONCLUSIONS We previously showed that a high-calorie diet and insulin induce Foxc2 in adipocytes; the current findings identify a previously unknown role for Foxc2 as an important metabo-regulator of mitochondrial morphology and metabolism.
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Affiliation(s)
- Martin E. Lidell
- Department of Medical and Clinical Genetics, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Erin L. Seifert
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
| | - Rickard Westergren
- Department of Medical and Clinical Genetics, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Mikael Heglind
- Department of Medical and Clinical Genetics, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Adrienne Gowing
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
| | - Valentina Sukonina
- Department of Medical and Clinical Genetics, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Zahra Arani
- Department of Medical and Clinical Genetics, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Paula Itkonen
- Department of Medicine, University of Kuopio and Kuopio University Hospital, Kuopio, Finland
| | | | | | - Julia Fernandez-Rodriguez
- Department of Medical and Clinical Genetics, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Markku Laakso
- Department of Medicine, University of Kuopio and Kuopio University Hospital, Kuopio, Finland
| | - Tommy Nilsson
- Department of Medical and Clinical Genetics, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | | | - Mary-Ellen Harper
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
| | - Sven Enerbäck
- Department of Medical and Clinical Genetics, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Corresponding author: Sven Enerbäck,
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Dwivedi RS, Herman JG, McCaffrey TA, Raj DSC. Beyond genetics: epigenetic code in chronic kidney disease. Kidney Int 2010; 79:23-32. [PMID: 20881938 DOI: 10.1038/ki.2010.335] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Epigenetics refers to a heritable change in the pattern of gene expression that is mediated by a mechanism specifically not due to alterations in the primary nucleotide sequence. Well-known epigenetic mechanisms encompass DNA methylation, chromatin remodeling (histone modifications), and RNA interference. Functionally, epigenetics provides an extra layer of transcriptional control and plays a crucial role in normal physiological development, as well as in pathological conditions. Aberrant DNA methylation is implicated in immune dysfunction, inflammation, and insulin resistance. Epigenetic changes may be responsible for 'metabolic memory' and development of micro- and macrovascular complications of diabetes. MicroRNAs are critical in the maintenance of glomerular homeostasis and hence RNA interference may be important in the progression of renal disease. Recent studies have shown that epigenetic modifications orchestrate the epithelial-mesenchymal transition and eventually fibrosis of the renal tissue. Oxidative stress, inflammation, hyperhomocysteinemia, and uremic toxins could induce epimutations in chronic kidney disease. Epigenetic alterations are associated with inflammation and cardiovascular disease in patients with chronic kidney disease. Reversible nature of the epigenetic changes gives a unique opportunity to halt or even reverse the disease process through targeted therapeutic strategies.
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Affiliation(s)
- Rama S Dwivedi
- Division of Renal Diseases and Hypertension, The George Washington University, Washington, District of Columbia 20037, USA
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Gemma C, Sookoian S, Dieuzeide G, García SI, Gianotti TF, González CD, Pirola CJ. Methylation of TFAM gene promoter in peripheral white blood cells is associated with insulin resistance in adolescents. Mol Genet Metab 2010; 100:83-7. [PMID: 20202876 DOI: 10.1016/j.ymgme.2010.02.004] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Accepted: 02/05/2010] [Indexed: 01/31/2023]
Abstract
PURPOSE To explore whether DNA methylation of the mitochondrial transcription factor A (TFAM) promoter is associated with insulin resistance in a sample of adolescents with features of metabolic syndrome. METHODS The data and blood samples were collected from 122 adolescents out of a cross-sectional study of 934 high-school students. The population was divided into two groups: noninsulin resistance (NIR) and insulin resistance (IR). After bisulfite treatment of genomic DNA from peripheral leukocytes, we used methylation-specific polymerase chain reaction (PCR) to assess DNA methylation of three putative methylation target sites (CpG) in the TFAM promoter. RESULTS The ratio of the promoter methylated DNA/unmethylated DNA was 0.012+/-0.0009 (1.2% of alleles), and inversely correlated with the biochemical features of insulin resistance (plasma fasting insulin R: -0.26, p<0.004 and homeostasis model assessment (HOMA) index R: -0.27, p<0.002), and obesity (R: -0.27, p<0.002). Multiple regression analysis showed that the log-transformed HOMA index correlated with the status of promoter methylation of TFAM, independently of body mass index (BMI) Z score (beta: -0.33+/-0.094, p=0.00094). Finally, the TFAM promoter methylated DNA/unmethylated DNA ratio was found to be significantly associated with insulin resistance as dichotomous variable (NIR n=45, 0.014+/-0.002 and IR n=77, 0.011+/-0.001, respectively, p<0.016). CONCLUSION Our findings suggest a potential role of promoter TFAM methylation in the pathogenesis of insulin resistance in adolescents.
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Affiliation(s)
- Carolina Gemma
- Department of Molecular Genetics and Biology of Complex Diseases, Institute of Medical Research, A. Lanari-IDIM, University of Buenos Aires, National Council of Scientific and Technological Research (CONICET), Ciudad Autónoma de Buenos Aires C1427ARO, Argentina
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Clay Montier LL, Deng JJ, Bai Y. Number matters: control of mammalian mitochondrial DNA copy number. J Genet Genomics 2009; 36:125-31. [PMID: 19302968 PMCID: PMC4706993 DOI: 10.1016/s1673-8527(08)60099-5] [Citation(s) in RCA: 378] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Revised: 01/13/2009] [Accepted: 01/19/2009] [Indexed: 12/15/2022]
Abstract
Regulation of mitochondrial biogenesis is essential for proper cellular functioning. Mitochondrial DNA (mtDNA) depletion and the resulting mitochondrial malfunction have been implicated in cancer, neurodegeneration, diabetes, aging, and many other human diseases. Although it is known that the dynamics of the mammalian mitochondrial genome are not linked with that of the nuclear genome, very little is known about the mechanism of mtDNA propagation. Nevertheless, our understanding of the mode of mtDNA replication has advanced in recent years, though not without some controversies. This review summarizes our current knowledge of mtDNA copy number control in mammalian cells, while focusing on both mtDNA replication and turnover. Although mtDNA copy number is seemingly in excess, we reason that mtDNA copy number control is an important aspect of mitochondrial genetics and biogenesis and is essential for normal cellular function.
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Affiliation(s)
- Laura L Clay Montier
- Department of Cellular and Structural Biology, The Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
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Suarez J, Hu Y, Makino A, Fricovsky E, Wang H, Dillmann WH. Alterations in mitochondrial function and cytosolic calcium induced by hyperglycemia are restored by mitochondrial transcription factor A in cardiomyocytes. Am J Physiol Cell Physiol 2008; 295:C1561-8. [PMID: 19060297 DOI: 10.1152/ajpcell.00076.2008] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mitochondrial transcription factor A (TFAM) is essential for mitochondrial DNA transcription and replication. TFAM transcriptional activity is decreased in diabetic cardiomyopathy; however, the functional implications are unknown. We hypothesized that a reduced TFAM activity may be responsible for some of the alterations caused by hyperglycemia. Therefore, we investigated the effect of TFAM overexpression on hyperglycemia-induced cytosolic calcium handling and mitochondrial abnormalities. Neonatal rat cardiomyocytes were exposed to high glucose (30 mM) for 48 h, and we examined whether TFAM overexpression, by protecting mitochondrial DNA, could reestablish calcium fluxes and mitochondrial alterations toward normal. Our results shown that TFAM overexpression increased to more than twofold mitochondria copy number in cells treated either with normal (5.5 mM) or high glucose. ATP content was reduced by 30% and mitochondrial calcium decreased by 40% after high glucose. TFAM overexpression returned these parameters to even higher than control values. Calcium transients were prolonged by 70% after high glucose, which was associated with diminished sarco(endo)plasmic reticulum Ca(2+)-ATPase 2a and cytochrome-c oxidase subunit 1 expression. These parameters were returned to control values after TFAM overexpression. High glucose-induced protein oxidation was reduced by TFAM overexpression, indicating a reduction of the high glucose-induced oxidative stress. In addition, we found that TFAM activity can be modulated by O-linked beta-N-acetylglucosamine glycosylation. In conclusion, TFAM overexpression protected cell function against the damage induced by high glucose in cardiomyocytes.
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Affiliation(s)
- Jorge Suarez
- Dept. of Medicine, Univ. of California, San Diego, La Jolla, CA 92093-0618, USA
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Silvestri E, Schiavo L, Lombardi A, Goglia F. Thyroid hormones as molecular determinants of thermogenesis. ACTA ACUST UNITED AC 2006; 184:265-83. [PMID: 16026419 DOI: 10.1111/j.1365-201x.2005.01463.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Thyroid hormones (TH) are major modulators of energy metabolism and thermogenesis. It is generally believed that 3,5,3'-triiodo-l-thyronine (T3) is the only active form of TH, and that most of its effects are mediated by nuclear T3 receptors, which chiefly affect the transcription of target genes. Some of these genes encode for the proteins involved in energy metabolism. However, a growing volume of evidence now indicates that other iodothyronines may be biologically active. Several mechanisms have been proposed to explain the calorigenic effect of TH, but none has received universal acceptance. Cold acclimation/exposure and altered nutritional status are physiological conditions in which a modulation of energy expenditure is particularly important. TH seem to be deeply involved in this modulation, and this article will review some aspects of their possible influence in these conditions.
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Affiliation(s)
- E Silvestri
- Dipartimento di Scienze Biologiche ed Ambientali, Università degli Studi del Sannio, Benevento, Italy
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Lee YY, Park KS, Pak YK, Lee HK. The role of mitochondrial DNA in the development of type 2 diabetes caused by fetal malnutrition. J Nutr Biochem 2005; 16:195-204. [PMID: 15808323 DOI: 10.1016/j.jnutbio.2004.11.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2004] [Revised: 10/12/2004] [Accepted: 11/05/2004] [Indexed: 01/06/2023]
Abstract
Epidemiological studies have revealed strong and reproducible links between indices of poor fetal growth and susceptibility to the development of glucose intolerance and insulin resistance syndrome in adult life. To explain these associations, the thrifty phenotype hypothesis has been proposed. Mitochondrial DNA abnormalities have been known to cause insulin deficiency, insulin resistance and diabetes mellitus. In this review, we propose that mitochondrial dysfunction is a link between malnutrition during early life and disease in adult life. The potential mechanism for mitochondrial dysfunction will be focused on availability of the taurine and nucleotides, and imprinting on the genes.
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Affiliation(s)
- Yun Yong Lee
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul 110-744, South Korea
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