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Montesanto A, Crocco P, Anfossi M, Smirne N, Puccio G, Colao R, Maletta R, Passarino G, Bruni AC, Rose G. The Genetic Variability of UCP4 Affects the Individual Susceptibility to Late-Onset Alzheimer’s Disease and Modifies the Disease’s Risk in APOE-ɛ4 Carriers. J Alzheimers Dis 2016; 51:1265-74. [DOI: 10.3233/jad-150993] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Alberto Montesanto
- Department of Biology, Ecology and Earth Science, University of Calabria, Rende (CS), Italy
| | - Paolina Crocco
- Department of Biology, Ecology and Earth Science, University of Calabria, Rende (CS), Italy
| | - Maria Anfossi
- Regional Neurogenetic Centre, ASP CZ, Lamezia Terme (CZ), Italy
| | | | | | - Rosanna Colao
- Regional Neurogenetic Centre, ASP CZ, Lamezia Terme (CZ), Italy
| | | | - Giuseppe Passarino
- Department of Biology, Ecology and Earth Science, University of Calabria, Rende (CS), Italy
| | - Amalia C. Bruni
- Regional Neurogenetic Centre, ASP CZ, Lamezia Terme (CZ), Italy
| | - Giuseppina Rose
- Department of Biology, Ecology and Earth Science, University of Calabria, Rende (CS), Italy
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2
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Szolnoki Z, Szekeres M, Szaniszlo I, Balda G, Bodor A, Kondacs A, Mandi Y, Somogyvari F. Decreased Number of Mitochondria in Leukoaraiosis. Arch Med Res 2015; 46:604-8. [PMID: 26577272 DOI: 10.1016/j.arcmed.2015.11.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 11/02/2015] [Indexed: 02/01/2023]
Abstract
BACKGROUND AND AIMS Leukoaraiosis (LA), one of the most frequent causes of an age-associated cognitive decline, can be associated with a poor quality of life, leading overall to far-reaching public health problems. Chronic hypoxia of the white matter of the brain may be a factor triggering this entity. LA may develop as a consequence of chronically insufficient cellular energy production and the accumulation of free radicals. METHODS In this context, after hypothesizing that the number of healthy mitochondria can be crucial in this complex process, a case-control LA study was carried out in which we analyzed the numbers of deleted and non-deleted mitochondria (the common D-loop deletion) per white blood cell. A total of 234 patients with LA and 123 MRI alteration-free subjects served as a control group. RESULTS Interestingly, it emerged that the ratio of deleted relative to non-deleted mitochondria is strongly associated with the risk of LA. The calculated K ratio in the LA group was significantly lower than the K ratio in the controls (LA: K 0.37 95% CI 0.05; controls: K 0.48, 95% CI 0.076, p < 0.001). CONCLUSIONS Our study suggests that the ratio of the dmDNA and mDNA can be of great importance in the pathogenesis of LA.
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Affiliation(s)
- Zoltan Szolnoki
- Department of Cerebrovascular Diseases, Pándy Kálmán County Hospital, Gyula, Hungary.
| | - Marta Szekeres
- Department of Medical Microbiology and Immunology, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Istvan Szaniszlo
- Department of Cerebrovascular Diseases, Pándy Kálmán County Hospital, Gyula, Hungary
| | - Gyorgy Balda
- Department of Cerebrovascular Diseases, Pándy Kálmán County Hospital, Gyula, Hungary
| | - Anita Bodor
- Department of Pathology, Réthy Pál County Hospital, Békéscsaba, Hungary
| | - Andras Kondacs
- Department of Cerebrovascular Diseases, Pándy Kálmán County Hospital, Gyula, Hungary
| | - Yvette Mandi
- Department of Medical Microbiology and Immunology, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Ferenc Somogyvari
- Department of Medical Microbiology and Immunology, Faculty of Medicine, University of Szeged, Szeged, Hungary
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Bonora M, De Marchi E, Patergnani S, Suski JM, Celsi F, Bononi A, Giorgi C, Marchi S, Rimessi A, Duszyński J, Pozzan T, Wieckowski MR, Pinton P. Tumor necrosis factor-α impairs oligodendroglial differentiation through a mitochondria-dependent process. Cell Death Differ 2014; 21:1198-208. [PMID: 24658399 DOI: 10.1038/cdd.2014.35] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Revised: 01/22/2014] [Accepted: 02/06/2014] [Indexed: 01/09/2023] Open
Abstract
Mitochondrial defects, affecting parameters such as mitochondrial number and shape, levels of respiratory chain complex components and markers of oxidative stress, have been associated with the appearance and progression of multiple sclerosis. Nevertheless, mitochondrial physiology has never been monitored during oligodendrocyte progenitor cell (OPC) differentiation, especially in OPCs challenged with proinflammatory cytokines. Here, we show that tumor necrosis factor alpha (TNF-α) inhibits OPC differentiation, accompanied by altered mitochondrial calcium uptake, mitochondrial membrane potential, and respiratory complex I activity as well as increased reactive oxygen species production. Treatment with a mitochondrial uncoupler (FCCP) to mimic mitochondrial impairment also causes cells to accumulate at the progenitor stage. Interestingly, AMP-activated protein kinase (AMPK) levels increase during TNF-α exposure and inhibit OPC differentiation. Overall, our data indicate that TNF-α induces metabolic changes, driven by mitochondrial impairment and AMPK activation, leading to the inhibition of OPC differentiation.
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Affiliation(s)
- M Bonora
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Interdisciplinary Center for the Study of Inflammation (ICSI), Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - E De Marchi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Interdisciplinary Center for the Study of Inflammation (ICSI), Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - S Patergnani
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Interdisciplinary Center for the Study of Inflammation (ICSI), Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - J M Suski
- 1] Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Interdisciplinary Center for the Study of Inflammation (ICSI), Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy [2] Department of Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland
| | - F Celsi
- Institute for Maternal and Child Health, IRCCS Burlo Garofolo, Trieste, Italy
| | - A Bononi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Interdisciplinary Center for the Study of Inflammation (ICSI), Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - C Giorgi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Interdisciplinary Center for the Study of Inflammation (ICSI), Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - S Marchi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Interdisciplinary Center for the Study of Inflammation (ICSI), Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - A Rimessi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Interdisciplinary Center for the Study of Inflammation (ICSI), Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - J Duszyński
- Department of Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland
| | - T Pozzan
- 1] Istituto Veneto di Medicina Molecolare, Fondazione per la Ricerca Biomedica Avanzata, Padua, Italy [2] Dipartimento di Scienze Biomediche, Università di Padova, Padua, Italy [3] Consiglio Nazionale delle Ricerche, Istituto di Neuroscienze, Sezione di Padova, Padua, Italy
| | - M R Wieckowski
- Department of Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland
| | - P Pinton
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Interdisciplinary Center for the Study of Inflammation (ICSI), Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
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Current world literature. Curr Opin Nephrol Hypertens 2012; 21:557-66. [PMID: 22874470 DOI: 10.1097/mnh.0b013e3283574c3b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ramsden DB, Ho PW, Ho JW, Liu H, So DH, Tse H, Chan K, Ho S. Human neuronal uncoupling proteins 4 and 5 (UCP4 and UCP5): structural properties, regulation, and physiological role in protection against oxidative stress and mitochondrial dysfunction. Brain Behav 2012; 2:468-78. [PMID: 22950050 PMCID: PMC3432969 DOI: 10.1002/brb3.55] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Revised: 03/07/2012] [Accepted: 03/09/2012] [Indexed: 01/07/2023] Open
Abstract
Uncoupling proteins (UCPs) belong to a large family of mitochondrial solute carriers 25 (SLC25s) localized at the inner mitochondrial membrane. UCPs transport protons directly from the intermembrane space to the matrix. Of five structural homologues (UCP1 to 5), UCP4 and 5 are principally expressed in the central nervous system (CNS). Neurons derived their energy in the form of ATP that is generated through oxidative phosphorylation carried out by five multiprotein complexes (Complexes I-V) embedded in the inner mitochondrial membrane. In oxidative phosphorylation, the flow of electrons generated by the oxidation of substrates through the electron transport chain to molecular oxygen at Complex IV leads to the transport of protons from the matrix to the intermembrane space by Complex I, III, and IV. This movement of protons to the intermembrane space generates a proton gradient (mitochondrial membrane potential; MMP) across the inner membrane. Complex V (ATP synthase) uses this MMP to drive the conversion of ADP to ATP. Some electrons escape to oxygen-forming harmful reactive oxygen species (ROS). Proton leakage back to the matrix which bypasses Complex V resulting in a major reduction in ROS formation while having a minimal effect on MMP and hence, ATP synthesis; a process termed "mild uncoupling." UCPs act to promote this proton leakage as means to prevent excessive build up of MMP and ROS formation. In this review, we discuss the structure and function of mitochondrial UCPs 4 and 5 and factors influencing their expression. Hypotheses concerning the evolution of the two proteins are examined. The protective mechanisms of the two proteins against neurotoxins and their possible role in regulating intracellular calcium movement, particularly with regard to the pathogenesis of Parkinson's disease are discussed.
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Affiliation(s)
- David B. Ramsden
- School of Medicine and School of Biosciences, University of Birmingham, United Kingdom
| | - Philip W.‐L. Ho
- Division of Neurology, Department of Medicine, University of Hong Kong, Hong Kong, PR China
- Research Centre of Heart, Brain, Hormone and Healthy Aging (HBHA), University of Hong Kong, Hong Kong, PR China
| | - Jessica W.‐M. Ho
- Division of Neurology, Department of Medicine, University of Hong Kong, Hong Kong, PR China
| | - Hui‐Fang Liu
- Division of Neurology, Department of Medicine, University of Hong Kong, Hong Kong, PR China
| | - Danny H.‐F. So
- Division of Neurology, Department of Medicine, University of Hong Kong, Hong Kong, PR China
| | - Ho‐Man Tse
- Division of Neurology, Department of Medicine, University of Hong Kong, Hong Kong, PR China
| | - Koon‐Ho Chan
- Division of Neurology, Department of Medicine, University of Hong Kong, Hong Kong, PR China
- Research Centre of Heart, Brain, Hormone and Healthy Aging (HBHA), University of Hong Kong, Hong Kong, PR China
| | - Shu‐Leong Ho
- Division of Neurology, Department of Medicine, University of Hong Kong, Hong Kong, PR China
- Research Centre of Heart, Brain, Hormone and Healthy Aging (HBHA), University of Hong Kong, Hong Kong, PR China
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Association between serum total bilirubin level and leukoaraiosis in Korean adults. Clin Biochem 2012; 45:289-92. [DOI: 10.1016/j.clinbiochem.2011.12.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2011] [Revised: 12/23/2011] [Accepted: 12/27/2011] [Indexed: 11/21/2022]
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Ho PWL, Ho JWM, Tse HM, So DHF, Yiu DCW, Liu HF, Chan KH, Kung MHW, Ramsden DB, Ho SL. Uncoupling protein-4 (UCP4) increases ATP supply by interacting with mitochondrial Complex II in neuroblastoma cells. PLoS One 2012; 7:e32810. [PMID: 22427795 PMCID: PMC3303587 DOI: 10.1371/journal.pone.0032810] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Accepted: 02/03/2012] [Indexed: 12/21/2022] Open
Abstract
Mitochondrial uncoupling protein-4 (UCP4) protects against Complex I deficiency as induced by 1-methyl-4-phenylpyridinium (MPP(+)), but how UCP4 affects mitochondrial function is unclear. Here we investigated how UCP4 affects mitochondrial bioenergetics in SH-SY5Y cells. Cells stably overexpressing UCP4 exhibited higher oxygen consumption (10.1%, p<0.01), with 20% greater proton leak than vector controls (p<0.01). Increased ATP supply was observed in UCP4-overexpressing cells compared to controls (p<0.05). Although state 4 and state 3 respiration rates of UCP4-overexpressing and control cells were similar, Complex II activity in UCP4-overexpressing cells was 30% higher (p<0.05), associated with protein binding between UCP4 and Complex II, but not that of either Complex I or IV. Mitochondrial ADP consumption by succinate-induced respiration was 26% higher in UCP4-overexpressing cells, with 20% higher ADP:O ratio (p<0.05). ADP/ATP exchange rate was not altered by UCP4 overexpression, as shown by unchanged mitochondrial ADP uptake activity. UCP4 overexpression retained normal mitochondrial morphology in situ, with similar mitochondrial membrane potential compared to controls. Our findings elucidate how UCP4 overexpression increases ATP synthesis by specifically interacting with Complex II. This highlights a unique role of UCP4 as a potential regulatory target to modulate mitochondrial Complex II and ATP output in preserving existing neurons against energy crisis.
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Affiliation(s)
- Philip Wing-Lok Ho
- Division of Neurology, University Department of Medicine, University of Hong Kong, Hong Kong, Hong Kong.
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Rose G, Crocco P, De Rango F, Montesanto A, Passarino G. Further support to the uncoupling-to-survive theory: the genetic variation of human UCP genes is associated with longevity. PLoS One 2011; 6:e29650. [PMID: 22216339 PMCID: PMC3246500 DOI: 10.1371/journal.pone.0029650] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2011] [Accepted: 12/02/2011] [Indexed: 12/26/2022] Open
Abstract
In humans Uncoupling Proteins (UCPs) are a group of five mitochondrial inner membrane transporters with variable tissue expression, which seem to function as regulators of energy homeostasis and antioxidants. In particular, these proteins uncouple respiration from ATP production, allowing stored energy to be released as heat. Data from experimental models have previously suggested that UCPs may play an important role on aging rate and lifespan. We analyzed the genetic variability of human UCPs in cohorts of subjects ranging between 64 and 105 years of age (for a total of 598 subjects), to determine whether specific UCP variability affects human longevity. Indeed, we found that the genetic variability of UCP2, UCP3 and UCP4 do affect the individual's chances of surviving up to a very old age. This confirms the importance of energy storage, energy use and modulation of ROS production in the aging process. In addition, given the different localization of these UCPs (UCP2 is expressed in various tissues including brain, hearth and adipose tissue, while UCP3 is expressed in muscles and Brown Adipose Tissue and UCP4 is expressed in neuronal cells), our results may suggest that the uncoupling process plays an important role in modulating aging especially in muscular and nervous tissues, which are indeed very responsive to metabolic alterations and are very important in estimating health status and survival in the elderly.
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Affiliation(s)
- Giuseppina Rose
- Department of Cell Biology, University of Calabria, Rende, Italy
| | - Paolina Crocco
- Department of Cell Biology, University of Calabria, Rende, Italy
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Pfeiffer M, Kayzer EB, Yang X, Abramson E, Kenaston MA, Lago CU, Lo HH, Sedensky MM, Lunceford A, Clarke CF, Wu SJ, McLeod C, Finkel T, Morgan PG, Mills EM. Caenorhabditis elegans UCP4 protein controls complex II-mediated oxidative phosphorylation through succinate transport. J Biol Chem 2011; 286:37712-20. [PMID: 21862587 DOI: 10.1074/jbc.m111.271452] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The novel uncoupling proteins (UCP2-5) are implicated in the mitochondrial control of oxidant production, insulin signaling, and aging. Attempts to understand their functions have been complicated by overlapping expression patterns in most organisms. Caenorhabditis elegans nematodes are unique because they express only one UCP ortholog, ceUCP4 (ucp4). Here, we performed detailed metabolic analyzes in genetically modified nematodes to define the function of the ceUCP4. The knock-out mutant ucp4 (ok195) exhibited sharply decreased mitochondrial succinate-driven (complex II) respiration. However, respiratory coupling and electron transport chain function were normal in ucp4 mitochondria. Surprisingly, isolated ucp4 mitochondria showed markedly decreased succinate uptake. Similarly, ceUCP4 inhibition blocked succinate respiration and import in wild type mitochondria. Genetic and pharmacologic inhibition of complex I function was selectively lethal to ucp4 worms, arguing that ceUCP4-regulated succinate transport is required for optimal complex II function in vivo. Additionally, ceUCP4 deficiency prolonged lifespan in the short-lived mev1 mutant that exhibits complex II-generated oxidant production. These results identify a novel function for ceUCP4 in the regulation of complex II-based metabolism through an unexpected mechanism involving succinate transport.
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Affiliation(s)
- Matthew Pfeiffer
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Texas, Austin, Texas 78712, USA
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