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OXPHOS disease

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https://www.readbyqxmd.com/read/28416471/chemotherapy-resistant-human-acute-myeloid-leukemia-cells-are-not-enriched-for-leukemic-stem-cells-but-require-oxidative-metabolism
#1
Thomas Farge, Estelle Saland, Fabienne de Toni, Nesrine Aroua, Moshen Hosseini, Robin Perry, Claudie Bosc, Mayumi Sugita, Lucille Stuani, Marine Fraisse, Sarah Scotland, Clément Larrue, Héléna Boutzen, Virginie Féliu, Marie-Laure Nicolau-Travers, Stephanie Cassant-Sourdy, Nicolas Broin, Marion David, Nizar Serhan, Audrey Sarry, Suzanne Tavitian, Tony Kaoma, Laurent Vallar, Jason Iacovoni, Laetitia K Linares, Camille Montersino, Remy Castellano, Emmanuel Griessinger, Yves Collette, Olivier Duchamp, Yara Barreira, Pierre Hirsch, Tony Palama, Lara Gales, Francois Delhommeau, Barbara H Garmy-Susini, Jean-Charles Portais, Francois Vergez, Mary Selak, Gwenn Danet-Desnoyers, Martin Carroll, Christian Récher, Jean Emmanuel Sarry
Chemotherapy-resistant human acute myeloid leukemia (AML) cells are thought to be enriched in quiescent immature leukemic stem cells (LSCs). To validate this hypothesis in vivo, we developed a clinically relevant chemotherapeutic approach treating patient-derived xenograft (PDX) with cytarabine. Cytarabine residual AML cells are enriched neither in immature, quiescent cells nor LSCs. Strikingly, cytarabine-resistant pre-existing and persisting cells displayed high levels of reactive oxygen species, showed increased mitochondrial mass, and retained active polarized mitochondria, consistent with a high oxidative phosphorylation (OXPHOS) status...
April 17, 2017: Cancer Discovery
https://www.readbyqxmd.com/read/28404750/human-adenine-nucleotide-translocases-physically-and-functionally-interact-with-respirasomes
#2
Ya-Wen Lu, Michelle Grace Acoba, Kandasamy Selvaraju, Tai-Chung Huang, Raja S Nirujogi, Gajanan Sathe, Akhilesh Pandey, Steven M Claypool
Members of the adenine nucleotide translocase (ANT) family exchange ADP for ATP across the mitochondrial inner membrane, an activity that is essential for oxidative phosphorylation (OXPHOS). Mutations in or dysregulation of ANTs is associated with progressive external ophthalmoplegia, cardiomyopathy, non-syndromic intellectual disability, apoptosis and the Warburg effect. Binding partners of human ANTs have not been systematically identified. The absence of such information has prevented a detailed molecular understanding of the assorted ANT-associated diseases including insight into their disparate phenotypic manifestations...
April 12, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28392417/pharmacological-inhibition-of-carnitine-palmitoyltransferase-1-restores-mitochondrial-oxidative-phosphorylation-in-human-trifunctional-protein-deficient-fibroblasts
#3
Bruno Lefort, Elodie Gouache, Cécile Acquaviva, Marine Tardieu, Jean François Benoist, Jean-François Dumas, Stéphane Servais, Stéphan Chevalier, Christine Vianey-Saban, François Labartheh
BACKGROUND: Mitochondrial Trifunctional Protein deficiency (TFPD) is a severe genetic disease characterized by altered energy metabolism and accumulation of long-chain (LC) acylcarnitines in blood and tissues. This accumulation could impair the mitochondrial oxidative phosphorylation (OxPhos), contributing to the non-optimal outcome despite conventional diet therapy with medium-chain triglycerides (MCT). METHOD: Acylcarnitine and OxPhos parameters were measured in TFPD-fibroblasts obtained from 8 children and cultured in medium mimicking fasting (LCFA) or conventional treatment (MCT), with or without Etomoxir (ETX) an inhibitor of carnitine palmitoyltransferase 1 (CPT1) activity, and were compared to results obtained with fibroblasts from 5 healthy-control children...
April 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28362806/evolved-genetic-and-phenotypic-differences-due-to-mitochondrial-nuclear-interactions
#4
Tara Z Baris, Dominique N Wagner, David I Dayan, Xiao Du, Pierre U Blier, Nicolas Pichaud, Marjorie F Oleksiak, Douglas L Crawford
The oxidative phosphorylation (OxPhos) pathway is responsible for most aerobic ATP production and is the only pathway with both nuclear and mitochondrial encoded proteins. The importance of the interactions between these two genomes has recently received more attention because of their potential evolutionary effects and how they may affect human health and disease. In many different organisms, healthy nuclear and mitochondrial genome hybrids between species or among distant populations within a species affect fitness and OxPhos functions...
March 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28357370/attenuation-of-polyglutamine-induced-toxicity-by-enhancement-of-mitochondrial-oxphos-in-yeast-and-fly-models-of-aging
#5
Andrea L Ruetenik, Alejandro Ocampo, Kai Ruan, Yi Zhu, Chong Li, R Grace Zhai, Antoni Barrientos
Defects in mitochondrial biogenesis and function are common in many neurodegenerative disorders, including Huntington's disease (HD). We have previously shown that in yeast models of HD, enhancement of mitochondrial biogenesis through overexpression of Hap4, the catalytic subunit of the transcriptional complex that regulates mitochondrial gene expression, alleviates the growth arrest induced by expanded polyglutamine (polyQ) tract peptides in rapidly dividing cells. However, the mechanism through which HAP4 overexpression exerts this protection remains unclear...
July 26, 2016: Microbial Cell
https://www.readbyqxmd.com/read/28351484/hypocapnic-hypothesis-of-leigh-disease
#6
Ewa Pronicka
Leigh syndrome (LS) is a neurogenetic disorder of children caused by mutations in at least 75 genes which impair mitochondrial bioenergetics. The changes have typical localization in basal ganglia and brainstem, and typical histological picture of spongiform appearance, vascular proliferation and gliosis. ATP deprivation, free radicals and lactate accumulation are suspected to be the causes. Hypocapnic hypothesis proposed in the paper questions the energy deprivation as the mechanism of LS. We assume that the primary harmful factor is hypocapnia (decrease in pCO2) and respiratory alkalosis (increase in pH) due to hyperventilation, permanent or in response to stress...
April 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28345766/%C3%AE-linolenic-acid-and-exercise-training-independently-and-additively-decreases-blood-pressure-and-prevents-diastolic-dysfunction-in-obese-zucker-rats
#7
Pierre-Andre Barbeau, Tanya M Holloway, Jamie Whitfield, Brittany Baechler, Joe Quadrilatero, Luc J C van Loon, Adrian Chabowski, Graham P Holloway
While α-linolenic acid (ALA) and endurance exercise training independently attenuate hyperlipidemia-related cardiovascular derangements, there is a paucity of information pertaining to their mechanisms-of-action and efficacy when combined as a preventative therapeutic approach. Therefore, we used obese Zucker rats to investigate the independent and combined effects of these interventions on cardiovascular disease. Specifically, animals were randomly assigned to one of the following: control diet-sedentary (C-Sed), ALA supplemented-sedentary (ALA-Sed), control diet-exercise trained (C-Ex), or ALA supplemented-exercise trained (ALA-Ex)...
March 27, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28328323/an-adaptable-high-throughput-technology-enabling-the-identification-of-specific-transcription-modulators
#8
Tim Bergbrede, Emily Hoberg, Nils-Göran Larsson, Maria Falkenberg, Claes M Gustafsson
Mitochondria harbor the oxidative phosphorylation (OXPHOS) system, which under aerobic conditions produces the bulk of cellular adenosine triphosphate (ATP). The mitochondrial genome encodes key components of the OXPHOS system, and it is transcribed by the mitochondrial RNA polymerase, POLRMT. The levels of mitochondrial transcription correlate with the respiratory activity of the cell. Therefore, compounds that can increase or decrease mitochondrial gene transcription may be useful for fine-tuning metabolism and could be used to treat metabolic diseases or certain forms of cancer...
April 2017: SLAS Discovery
https://www.readbyqxmd.com/read/28276029/assessing-mitochondrial-selective-autophagy-in-the-nematode-caenorhabditis-elegans
#9
Konstantinos Palikaras, Nektarios Tavernarakis
Eukaryotic cells heavily depend on ATP generated by oxidative phosphorylation (OXPHOS) within mitochondria. Besides being the main suppliers of cell's energy, mitochondria also provide an additional compartment for a wide range of cellular processes and metabolic pathways. Mitochondria constantly undergo fusion/fission events and form a mitochondrial network, which is a highly dynamic, tubular structure allowing for rapid and continuous exchange of genetic material, as well as, targeting dysfunctional mitochondria for degradation through mitochondrial selective autophagy (mitophagy)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28273955/lack-of-xpc-leads-to-a-shift-between-respiratory-complexes-i-and-ii-but-sensitizes-cells-to-mitochondrial-stress
#10
Mateus P Mori, Rute A P Costa, Daniela T Soltys, Thiago de S Freire, Franco A Rossato, Ignácio Amigo, Alicia J Kowaltowski, Aníbal E Vercesi, Nadja C de Souza-Pinto
Genomic instability drives tumorigenesis and DNA repair defects are associated with elevated cancer. Metabolic alterations are also observed during tumorigenesis, although a causal relationship between these has not been clearly established. Xeroderma pigmentosum (XP) is a DNA repair disease characterized by early cancer. Cells with reduced expression of the XPC protein display a metabolic shift from OXPHOS to glycolysis, which was linked to accumulation of nuclear DNA damage and oxidants generation via NOX-1...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28256533/myofibroblast-differentiation-and-its-functional-properties-are-inhibited-by-nicotine-and-e-cigarette-via-mitochondrial-oxphos-complex-iii
#11
Wei Lei, Chad Lerner, Isaac K Sundar, Irfan Rahman
Nicotine is the major stimulant in tobacco products including e-cigarettes. Fibroblast to myofibroblast differentiation is a key process during wound healing and is dysregulated in lung diseases. The role of nicotine and e-cigarette derived nicotine on cellular functions including profibrotic response and other functional aspects is not known. We hypothesized that nicotine and e-cigarettes affect myofibroblast differentiation, gel contraction, and wound healing via mitochondria stress through nicotinic receptor-dependent mechanisms...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28243190/maternal-l-carnitine-supplementation-improves-brain-health-in-offspring-from-cigarette-smoke-exposed-mothers
#12
Yik Lung Chan, Sonia Saad, Ibrahim Al-Odat, Brian G Oliver, Carol Pollock, Nicole M Jones, Hui Chen
Maternal cigarette smoke exposure (SE) causes detrimental changes associated with the development of chronic neurological diseases in the offspring as a result of oxidative mitochondrial damage. Maternal L-Carnitine administration has been shown to reduce renal oxidative stress in SE offspring, but its effect in the brain is unknown. Here, we investigated the effects of maternal L-Carnitine supplementation on brain markers of oxidative stress, autophagy, mitophagy and mitochondrial energy producing oxidative phosphorylation (OXPHOS) complexes in SE offspring...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28242647/inhibiting-oxidative-phosphorylation-in-vivo-restrains-th17-effector-responses-and-ameliorates-murine-colitis
#13
Luigi Franchi, Ivan Monteleone, Ling-Yang Hao, Mark A Spahr, Wenpu Zhao, Xikui Liu, Kellie Demock, Aditi Kulkarni, Chuck A Lesch, Brian Sanchez, Laura Carter, Irene Marafini, Xiao Hu, Oksana Mashadova, Min Yuan, John M Asara, Harinder Singh, Costas A Lyssiotis, Giovanni Monteleone, Anthony W Opipari, Gary D Glick
Integration of signaling and metabolic pathways enables and sustains lymphocyte function. Whereas metabolic changes occurring during T cell activation are well characterized, the metabolic demands of differentiated T lymphocytes are largely unexplored. In this study, we defined the bioenergetics of Th17 effector cells generated in vivo. These cells depend on oxidative phosphorylation (OXPHOS) for energy and cytokine production. Mechanistically, the essential role of OXPHOS in Th17 cells results from their limited capacity to increase glycolysis in response to metabolic stresses...
April 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28220896/mitochondrial-dysregulation-secondary-to-endoplasmic-reticulum-stress-in-autosomal-dominant-tubulointerstitial-kidney-disease-umod-adtkd-umod
#14
Elisabeth Kemter, Thomas Fröhlich, Georg J Arnold, Eckhard Wolf, Rüdiger Wanke
'Autosomal dominant tubulointerstitial kidney disease - UMOD' (ADTKD-UMOD) is caused by impaired maturation and secretion of mutant uromodulin (UMOD) in thick ascending limb of Henle loop (TAL) cells, resulting in endoplasmic reticulum (ER) stress and unfolded protein response (UPR). To gain insight into pathophysiology, we analysed proteome profiles of TAL-enriched outer renal medulla samples from ADTKD-UMOD and control mice by quantitative LC-MS/MS. In total, 212 differentially abundant proteins were identified...
February 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28216230/activation-of-a-cryptic-splice-site-in-the-mitochondrial-elongation-factor-gfm1-causes-combined-oxphos-deficiency
#15
Mariella T Simon, Bobby G Ng, Marisa W Friederich, Raymond Y Wang, Monica Boyer, Martin Kircher, Renata Collard, Kati J Buckingham, Richard Chang, Jay Shendure, Deborah A Nickerson, Michael J Bamshad, Johan L K Van Hove, Hudson H Freeze, Jose E Abdenur
We report the clinical, biochemical, and molecular findings in two brothers with encephalopathy and multi-systemic disease. Abnormal transferrin glycoforms were suggestive of a type I congenital disorder of glycosylation (CDG). While exome sequencing was negative for CDG related candidate genes, the testing revealed compound heterozygous mutations in the mitochondrial elongation factor G gene (GFM1). One of the mutations had been reported previously while the second, novel variant was found deep in intron 6, activating a cryptic splice site...
February 12, 2017: Mitochondrion
https://www.readbyqxmd.com/read/28208064/mitochondrial-genes-are-altered-in-blood-early-in-alzheimer-s-disease
#16
Katie Lunnon, Aoife Keohane, Ruth Pidsley, Stephen Newhouse, Joanna Riddoch-Contreras, Elisabeth B Thubron, Matthew Devall, Hikka Soininen, Iwona Kłoszewska, Patrizia Mecocci, Magda Tsolaki, Bruno Vellas, Leonard Schalkwyk, Richard Dobson, Afshan N Malik, John Powell, Simon Lovestone, Angela Hodges
Although mitochondrial dysfunction is a consistent feature of Alzheimer's disease in the brain and blood, the molecular mechanisms behind these phenomena are unknown. Here we have replicated our previous findings demonstrating reduced expression of nuclear-encoded oxidative phosphorylation (OXPHOS) subunits and subunits required for the translation of mitochondrial-encoded OXPHOS genes in blood from people with Alzheimer's disease and mild cognitive impairment. Interestingly this was accompanied by increased expression of some mitochondrial-encoded OXPHOS genes, namely those residing closest to the transcription start site of the polycistronic heavy chain mitochondrial transcript (MT-ND1, MT-ND2, MT-ATP6, MT-CO1, MT-CO2, MT-C03) and MT-ND6 transcribed from the light chain...
May 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28188263/overexpression-of-mitochondrial-oxodicarboxylate-carrier-odc1-preserves-oxidative-phosphorylation-in-a-yeast-model-of-the-barth-syndrome
#17
Maxence de Taffin de Tilques, Déborah Tribouillard-Tanvier, Emmanuel Tétaud, Eric Testet, Jean-Paul di Rago, Jean-Paul Lasserre
Cardiolipin (CL) is a diglycerol phospholipid mostly found in mitochondria where it optimizes numerous processes including oxidative phosphorylation (OXPHOS). To function properly CL needs to be unsaturated, which requires the acyltransferase tafazzin. Loss-of-function mutations in this protein are responsible for the Barth syndrome (BTHS), presumably because of a diminished OXPHOS capacity. Here we show that overexpressing Odc1p, a conserved oxodicarboxylic acid carrier located in the mitochondrial inner membrane, fully restores oxidative phosphorylation in a yeast model (taz1Δ) of the Barth syndrome...
February 10, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/28132645/5-aminolevulinic-acid-combined-with-ferrous-ion-reduces-adiposity-and-improves-glucose-tolerance-in-diet-induced-obese-mice-via-enhancing-mitochondrial-function
#18
Urara Ota, Takeshi Hara, Hitoshi Nakagawa, Emi Tsuru, Masayuki Tsuda, Atsuko Kamiya, Yasushi Kuroda, Yuya Kitajima, Aya Koda, Masahiro Ishizuka, Hideo Fukuhara, Keiji Inoue, Taro Shuin, Motowo Nakajima, Tohru Tanaka
BACKGROUND: Mitochondrial dysfunction is associated with obesity and various obesity-associated pathological conditions including glucose intolerance. 5-Aminolevulinic acid (ALA), a precursor of heme metabolites, is a natural amino acid synthesized in the mitochondria, and various types of cytochromes containing heme contribute to aerobic energy metabolism. Thus, ALA might have beneficial effects on the reduction of adiposity and improvement of glucose tolerance through its promotion of heme synthesis...
January 30, 2017: BMC Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28117598/cr6-interacting-factor-1-deficiency-impairs-vascular-function-by-inhibiting-the-sirt1-enos-pathway
#19
Harsha Nagar, Saetbyel Jung, Min Jeong Ryu, Su Jung Choi, Shuyu Piao, Hee Jung Song, Shin Kwang Kang, Nara Shin, Dong Woon Kim, Seon-Ah Jin, Jin-Ok Jeong, Kaikobad Irani, Byeong Hwa Jeon, Minho Shong, Gi Ryang Kweon, Cuk Seong Kim
AIMS: Mitochondrial dysfunction has emerged as a major contributing factor to endothelial dysfunction and vascular disease, but the key mechanisms underlying mitochondrial dysfunction-induced endothelial dysfunction remain to be elucidated. In this study, we aim to determine whether mitochondrial dysfunction in endothelial cells plays a key role in vascular disease, by examining the phenotype of endothelial-specific CR6-interacting factor 1 (CRIF1) knockout mice. We also used siRNA mediated downregulation of CRIF1 gene in the endothelial cells to study about the in vitro pathophysiological underlying mechanisms...
January 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28068639/effects-of-argan-oil-on-the-mitochondrial-function-antioxidant-system-and-the-activity-of-nadph-generating-enzymes-in-acrylamide-treated-rat-brain
#20
Birsen Aydın
Argan oil (AO) is rich in minor compounds such as polyphenols and tocopherols which are powerful antioxidants. Acrylamide (ACR) has been classified as a neurotoxic agent in animals and humans. Mitochondrial oxidative stress and dysfunction is one of the most probable molecular mechanisms of neurodegenerative diseases. Female Sprague Dawley rats were exposed to ACR (50mg/kg i.p. three times a week), AO (6ml/kg,o.p, per day) or together for 30days. The activities of cytosolic enzymes such as xanthine oxidase (XO), glucose 6-phosphate dehydrogenase (G6PDH), glutathione-S-transferase (GST), mitochondrial oxidative stress, oxidative phosphorylation (OXPHOS) and tricarboxylic acid cycle (TCA) enzymes, mitochondrial metabolic function, adenosine triphosphate (ATP) level and acetylcholinesterase (AChE) activity were assessed in rat brain...
March 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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