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https://www.readbyqxmd.com/read/28302704/swimming-attenuates-d-galactose-induced-brain-aging-via-suppressing-mir-34a-mediated-autophagy-impairment-and-abnormal-mitochondrial-dynamics
#1
Xianjuan Kou, Jie Li, Xingran Liu, Jingru Chang, Qingxia Zhao, Shaohui Jia, Jingjing Fan, Ning Chen
MicroRNAs (miRNAs) have been reported to be involved in many neurodegenerative diseases. In order to explore the regulatory role of miR-34a in aging-related diseases such as Alzheimer's disease (AD) during exercise intervention, we constructed a rat model with (D-galactose) D-gal-induced oxidative stress and cognitive impairment coupled with dysfunctional autophagy and abnormal mitochondrial dynamics, determined the mitigation of cognitive impairment of D-gal-induced aging rats during swimming intervention, and evaluated miR-34a-mediated functional status of autophagy and abnormal mitochondrial dynamics...
March 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28292876/maternal-exercise-upregulates-mitochondrial-gene-expression-and-increases-enzyme-activity-of-fetal-mouse-hearts
#2
Eunhee Chung, Hayli E Joiner, Tracer Skelton, Kalli D Looten, Maria Manczak, P Hemachandra Reddy
Maternal exercise during pregnancy has been shown to improve the long-term health of offspring in later life. Mitochondria are important organelles for maintaining adequate heart function, and mitochondrial dysfunction is linked to cardiovascular disease. However, the effects of maternal exercise during pregnancy on mitochondrial biogenesis in hearts are not well understood. Thus, the purpose of this study was to test the hypothesis that mitochondrial gene expression in fetal myocardium would be upregulated by maternal exercise...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28288859/mitochondrial-toxicity-of-perfluorooctane-sulfonate-in-mouse-embryonic-stem-cell-derived-cardiomyocytes
#3
Lei-Lei Tang, Jia-Dan Wang, Ting-Ting Xu, Zhe Zhao, Jia-Jie Zheng, Ren-Shan Ge, Dan-Yan Zhu
Perfluorooctane sulfonate (PFOS) is a persistent organic contaminant that may cause cardiotoxicity in animals and humans. However, little is known about the underlying mechanism by which it affects the organelle toxicity in cardiomyocytes during the cardiogenesis. Our previous proteomic study showed that differences of protein expression mainly existed in mitochondria of cardiomyocytes differentiated from embryonic stem (ES) cells after exposure to PFOS. Here, we focused on mitochondrial toxicity of PFOS in ES cell-derived cardiomyocytes...
March 10, 2017: Toxicology
https://www.readbyqxmd.com/read/28286897/charcot-marie-tooth-disease-genetic-subtypes-in-the-sardinian-population
#4
Lorefice Lorena, Murru M Rita, Coghe Giancarlo, Fenu Giuseppe, Corongiu Daniela, Frau Jessica, Tranquilli Stefania, Tacconi Paolo, Vannelli Alessandro, Marrosu Giovanni, Mamusa Elena, Cocco Eleonora, Marrosu M Giovanna
Charcot-Marie-Tooth disease (CMT) is characterised by great variability of genetic subtypes. This study aimed to assess the genetic subtypes of CMT disease in the Sardinian population. Genetic screening was performed for CMT cases (CMT1, CMT2, and hereditary neuropathy with susceptibility to pressure palsies [HNPP]). A total of 1,043 subjects (119 index cases) were evaluated. In CMT1 index cases (69/119; 58%), PMP22 duplication at 17p11.2 was the most frequent genetic diagnosis (60/69; 87%), followed by mutations in the GJB1 gene (5/69; 7...
March 13, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28267517/effects-of-cultured-cordyceps-mycelia-polysaccharide-a-on-tumor-neurosis-factor-%C3%AE-induced-hepatocyte-injury-with-mitochondrial-abnormality
#5
Huiling Tang, Weikun Wei, Wang Wang, Zhengqi Zha, Ting Li, Zhijie Zhang, Chen Luo, Hongping Yin, Fengjie Huang, Ying Wang
Cordyceps sinensis mycelia polysaccharide A (CPS-A), was isolated from cultured Cordyceps mycelia by 65% alcohol extraction and ion-exchange column chromatography. The molecular weight of CPS-A was 1.2×10(4)Da and the backbone was mainly composed of (1→2)-linked β-d-mannopyranose, (1→2,4)-linked β-d-mannopyranose and (1→4)-linked α-d-glucopyranose with terminal β-d-mannopyranose and α-d-glucopyranose residues. CPS-A played a protective role against TNF-α induced mitochondria injury in L02 cells via up-regulation of mitofusin 2, peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α), and membrane potential...
May 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28261787/signalling-mechanisms-underlying-doxorubicin-and-nox2-nadph-oxidase-induced-cardiomyopathy-involvement-of-mitofusin-2
#6
Declan McLaughlin, Youyou Zhao, Karla M O'Neill, Kevin S Edgar, Philip D Dunne, Anna M Kearney, David J Grieve, Barbara J McDermott
BACKGROUND AND PURPOSE: The anthracycline doxorubicin (DOX), although successful as a first-line cancer treatment, induces cardiotoxicity linked with increased production of myocardial reactive oxygen species (ROS), with Nox2 NADPH oxidase-derived superoxide reported to play a key role. The aim of this study was to identify novel mechanisms underlying development of cardiac remodelling/dysfunction further to DOX-stimulated Nox2 activation. EXPERIMENTAL APPROACH: Nox2(-/-) and wild-type (WT) littermate mice were administered DOX (12mg/kg over 3 weeks) prior to study at 4 weeks...
March 6, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28251664/preservation-of-skeletal-muscle-mitochondrial-content-in-older-adults-relationship-between-mitochondria-fibre-type-and-high-intensity-exercise-training
#7
Victoria L Wyckelsma, Itamar Levinger, Michael J McKenna, Luke E Formosa, Michael T Ryan, Aaron C Petersen, Mitchell J Anderson, Robyn M Murphy
KEYPOINTS SUMMARY: Ageing is associated with an upregulation of mitochondrial dynamics proteins, mitofusin 2 (Mfn2) and mitochondrial dynamics protein 49 (MiD49) in human skeletal muscle, the increased abundance of Mfn2 is exclusive to Type II muscle fibres. These changes occur despite a similar content of mitochondria, as measured by COXIV, NDUFA9 and complexes in their native states (Blue Native PAGE). Following 12 weeks of High-Intensity Training (HIT), older adults exhibit a robust increase in mitochondria content...
March 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28235489/resveratrol-stimulates-mitochondrial-fusion-by-a-mechanism-requiring-mitofusin-2
#8
Ellen L Robb, Fereshteh Moradi, Lucas A Maddalena, Andrew J F Valente, Joao Fonseca, Jeffrey A Stuart
Resveratrol (RES) is a plant-derived stilbene associated with a wide range of health benefits. Mitochondria are a key downstream target of RES, and in some cell types RES promotes mitochondrial biogenesis, altered cellular redox status, and a shift toward oxidative metabolism. Mitochondria exist as a dynamic network that continually remodels via fusion and fission processes, and the extent of fusion is related to cellular redox status and metabolism. We investigated RES's effects on mitochondrial network morphology in several cell lines using a quantitative approach to measure the extent of network fusion...
April 1, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28215760/two-novel-cases-of-compound-heterozygous-mutations-in-mitofusin2-finding-out-the-inheritance
#9
Alessandro Geroldi, Patrizia Lastella, Margherita Patruno, Fabio Gotta, Nicoletta Resta, Grazia Devigili, Carlo Sabbà, Rossella Gulli, Merit Lamp, Paola Origone, Paola Mandich, Emilia Bellone
MFN2 is the major gene involved in the axonal form of Charcot-Marie-Tooth disease. It usually has an autosomal dominant pattern of inheritance, but a few cases of homozygous or compound heterozygous mutations have been described. These patients usually present an earlier onset, more severe phenotype and their inheritance pattern can span from autosomal recessive to semidominant. Here we report two unrelated patients carrying two compound heterozygous MFN2 mutations. Both present a pure axonal neuropathy without any additional features...
January 17, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28215579/mitochondrial-dna-maintenance-defects
#10
REVIEW
Ayman W El-Hattab, William J Craigen, Fernando Scaglia
The maintenance of mitochondrial DNA (mtDNA) depends on a number of nuclear gene-encoded proteins including a battery of enzymes forming the replisome needed to synthesize mtDNA. These enzymes need to be in balanced quantities to function properly that is in part achieved by exchanging intramitochondrial contents through mitochondrial fusion. In addition, mtDNA synthesis requires a balanced supply of nucleotides that is achieved by nucleotide recycling inside the mitochondria and import from the cytosol. Mitochondrial DNA maintenance defects (MDMDs) are a group of diseases caused by pathogenic variants in the nuclear genes involved in mtDNA maintenance resulting in impaired mtDNA synthesis leading to quantitative (mtDNA depletion) and qualitative (multiple mtDNA deletions) defects in mtDNA...
February 16, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28215578/mfn2-protects-dopaminergic-neurons-exposed-to-paraquat-both-in-vitro-and-in-vivo-implications-for-idiopathic-parkinson-s-disease
#11
Fanpeng Zhao, Wenzhang Wang, Chunyu Wang, Sandra L Siedlak, Hisashi Fujioka, Beisha Tang, Xiongwei Zhu
Mitochondrial dynamics and quality control plays a critical role in the maintenance of mitochondrial homeostasis and function. Pathogenic mutations of many genes associated with familial Parkinson's disease (PD) caused abnormal mitochondrial dynamics, suggesting a likely involvement of disturbed mitochondrial fission/fusion in the pathogenesis of PD. In this study, we focused on the potential role of mitochondrial fission/fusion in idiopathic PD patients and in neuronal cells and animals exposed to paraquat (PQ), a commonly used herbicide and PD-related neurotoxin, as models for idiopathic PD...
February 16, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28191022/effect-of-mahuang-gancao-ganjiang-decoction-on-fusion-and-fission-of-mitochondria-and-apoptosis-of-lymphocytes-in-mice-under-cold-stress
#12
Longyun Chen, Huimin Chen
Mahuang Gancao Ganjiang Decoction (MGGD) can effectively alleviate the symptoms of the patients suffering from exogenous cold stress. However, the curative mechanism has not been fully clarified. This study was designed to investigate the effect of MGGD on the apoptosis of lymphocytes induced by cold stress in mice. The model mice were randomly divided into four groups: the normal control group (no handling mice), cold stress group, MGGD + cold stress group, and MGGD group. Lymphocytes of the mice were isolated from the peripheral blood...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28177702/modulation-of-mitochondrial-biomarkers-by-intermittent-hypobaric-hypoxia-and-aerobic-exercise-after-eccentric-exercise-in-trained-rats
#13
David Rizo-Roca, Juan Gabriel Ríos-Kristjánsson, Cristian Núñez-Espinosa, Estela Santos-Alves, José Magalhães, António Ascensão, Teresa Pagès, Ginés Viscor, Joan Ramon Torrella
Unaccustomed eccentric contractions induce muscle damage, calcium homeostasis disruption and mitochondrial alterations. Since exercise and hypoxia are known to modulate mitochondrial function, we aimed to analyze the effects on eccentric exercise-induced muscle damage (EEIMD), in trained rats, of two recovery protocols based on: 1) intermittent hypobaric hypoxia (IHH) and 2) IHH followed by exercise. The expression of biomarkers related to mitochondrial biogenesis, dynamics, oxidative stress and bioenergetics was evaluated...
February 2, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28176801/mfn2-suppresses-cancer-progression-through-inhibition-of-mtorc2-akt-signaling
#14
Ke Xu, Guo Chen, Xiaobo Li, Xiaoqin Wu, Zhijie Chang, Jianhua Xu, Yu Zhu, Peihao Yin, Xin Liang, Lei Dong
The mitochondrial GTPase mitofusin-2 (MFN2) has previously been reported to play a role in regulating cell proliferation, apoptosis and differentiation in a number of cell types. Here, we report that breast cancer patients with low MFN2 expression are associated with poor prognosis as compared to patients with high MFN2 expression. We find that MFN2 knockout from MCF7 and A549 cells via Crispr/Cas9 greatly promotes cell viability, colony formation, and invasion of cancer cells in vitro and in vivo, which were confirmed by colony formation assay, transwell invasion assay, and tumor xenograft model...
February 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28164383/physiological-biochemical-anthropometric-and-biomechanical-influences-on-exercise-economy-in-humans
#15
Carsten Lundby, David Montero, Saskia Gehrig, Ulrika Anderson Hall, Pascal Kaiser, Robert Boushel, Anne-Kristine Meinild Lundby, Niels Kirk, Paola Valdivieso, Martin Flück, Niels H Secher, Frederik Edin, Tobias Hein, Klavs Madsen
Inter-individual variation in running and cycling exercise economy (EE) remains unexplained although studied for more than a century. This study is the first to comprehensively evaluate the importance of biochemical, structural, physiological, anthropometric, and biomechanical influences on running and cycling EE within a single study. In 22 healthy males (VO2 max range 45.5 to 72.1 ml.min(-1) .kg(-1) ) no factor related to skeletal muscle structure (% slow twitch fibre content, number of capillaries per fibre), mitochondrial properties (volume density, oxidative capacity, or mitochondrial efficiency) or protein content (UCP3 and MFN2 expression) explained variation in cycling and running EE among subjects...
February 5, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28131082/mitochondrial-dynamics-in-type-2-diabetes-pathophysiological-implications
#16
REVIEW
Susana Rovira-Llopis, Celia Bañuls, Noelia Diaz-Morales, Antonio Hernandez-Mijares, Milagros Rocha, Victor M Victor
Mitochondria play a key role in maintaining cellular metabolic homeostasis. These organelles have a high plasticity and are involved in dynamic processes such as mitochondrial fusion and fission, mitophagy and mitochondrial biogenesis. Type 2 diabetes is characterised by mitochondrial dysfunction, high production of reactive oxygen species (ROS) and low levels of ATP. Mitochondrial fusion is modulated by different proteins, including mitofusin-1 (MFN1), mitofusin-2 (MFN2) and optic atrophy (OPA-1), while fission is controlled by mitochondrial fission 1 (FIS1), dynamin-related protein 1 (DRP1) and mitochondrial fission factor (MFF)...
April 2017: Redox Biology
https://www.readbyqxmd.com/read/28110471/depletion-of-mitofusin-2-causes-mitochondrial-damage-in-cisplatin-induced-neuropathy
#17
Ilja Bobylev, Abhijeet R Joshi, Mohammed Barham, Wolfram F Neiss, Helmar C Lehmann
Sensory neuropathy is a relevant side effect of the antineoplastic agent cisplatin. Mitochondrial damage is assumed to play a critical role in cisplatin-induced peripheral neuropathy, but the pathomechanisms underlying cisplatin-induced mitotoxicity and neurodegeneration are incompletely understood. In an animal model of cisplatin-induced neuropathy, we determined in detail the extent and spatial distribution of mitochondrial damage during cisplatin treatment. Changes in the total number of axonal mitochondria during cisplatin treatment were assessed in intercostal nerves from transgenic mice that express cyan fluorescent protein...
January 21, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28108329/exercise-increases-mitochondrial-complex-i-activity-and-drp1-expression-in-the-brains-of-aged-mice
#18
Aaron M Gusdon, Jason Callio, Giovanna Distefano, Robert M O'Doherty, Bret H Goodpaster, Paul M Coen, Charleen T Chu
Exercise is known to have numerous beneficial effects. Recent studies indicate that exercise improves mitochondrial energetics not only in skeletal muscle but also in other tissues. While exercise elicits positive effects on memory, neurogenesis, and synaptic plasticity, the effects of exercise on brain mitochondrial energetics remain relatively unknown. Herein, we studied the effects of exercise training in old and young mice on brain mitochondrial energetics, in comparison to known effects on peripheral tissues that utilize fatty acid oxidation...
April 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28096879/association-between-mitofusin-2-gene-polymorphisms-and-late-onset-alzheimer-s-disease-in-the-korean-population
#19
Young Jong Kim, Jin Kyung Park, Won Sub Kang, Su Kang Kim, Changsu Han, Hae Ri Na, Hae Jeong Park, Jong Woo Kim, Young Youl Kim, Moon Ho Park, Jong-Woo Paik
OBJECTIVE: Mitochondrial dysfunction is a prominent and early feature of Alzheimer's disease (AD). The morphologic changes observed in the AD brain could be caused by a failure of mitochondrial fusion mechanisms. The aim of this study was to investigate whether genetic polymorphisms of two genes involved in mitochondrial fusion mechanisms, optic atrophy 1 (OPA1) and mitofusin 2 (MFN2), were associated with AD in the Korean population by analyzing genotypes and allele frequencies. METHODS: One coding single nucleotide polymorphism (SNP) in the MFN2, rs1042837, and two coding SNPs in the OPA1, rs7624750 and rs9851685, were compared between 165 patients with AD (83 men and 82 women, mean age 72...
January 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/28076385/the-effect-of-a-novel-c-820c-t-arg274trp-mutation-in-the-mitofusin-2-gene-on-fibroblast-metabolism-and-clinical-manifestation-in-a-patient
#20
Małgorzata Beręsewicz, Anna Boratyńska-Jasińska, Łukasz Charzewski, Maria Kawalec, Dagmara Kabzińska, Andrzej Kochański, Krystiana A Krzyśko, Barbara Zabłocka
Charcot-Marie-Tooth disease type 2A (CMT2A) is an autosomal dominant axonal peripheral neuropathy caused by mutations in the mitofusin 2 gene (MFN2). Mitofusin 2 is a GTPase protein present in the outer mitochondrial membrane and responsible for regulation of mitochondrial network architecture via the fusion of mitochondria. As that fusion process is known to be strongly dependent on the GTPase activity of mitofusin 2, it is postulated that the MFN2 mutation within the GTPase domain may lead to impaired GTPase activity, and in turn to mitochondrial dysfunction...
2017: PloS One
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