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https://www.readbyqxmd.com/read/28100372/-research-on-potential-interaction-between-mitochondrial-dna-copy-number-and-related-factors-on-risk-of-hypertension-in-coal-miners
#1
J Y Guo, L J Lei, N Qiao, G Q Fan, C M Sun, J J Huang, T Wang
Objective: To investigate the effects of mitochondrial DNA (mtDNA) copy number in peripheral blood and related factors on the risk of hypertension in coal miners. Methods: A case-control study was conducted in 378 coal miners with hypertension and 325 healthy coal miners recruited from Datong Coal Mine Group. A standard questionnaire was used to collect their general information, such as demographic characteristics, habits and occupational history. Fluorescence quantitative PCR was performed to detect the copy number of mtDNA...
January 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28099512/age-dependent-oxidative-dna-damage-does-not-correlate-with-reduced-proliferation-of-cardiomyocytes-in-humans
#2
Yanhui Huang, Haifa Hong, Minghui Li, Jinfen Liu, Chuan Jiang, Haibo Zhang, Lincai Ye, Jinghao Zheng
BACKGROUND: Postnatal human cardiomyocyte proliferation declines rapidly with age, which has been suggested to be correlated with increases in oxidative DNA damage in mice and plays an important role in regulating cardiomyocyte proliferation. However, the relationship between oxidative DNA damage and age in humans is unclear. METHODS: Sixty right ventricular outflow myocardial tissue specimens were obtained from ventricular septal defect infant patients during routine congenital cardiac surgery...
2017: PloS One
https://www.readbyqxmd.com/read/28099114/mitochondrial-respiratory-gene-expression-is-suppressed-in-many-cancers
#3
Ed Reznik, Qingguo Wang, Konnor La, Nikolaus Schultz, Chris Sander
The fundamental metabolic decision of a cell, the balance between respiration and fermentation, rests in part on expression of the mitochondrial genome (mtDNA) and coordination with expression of the nuclear genome (nuDNA). Previously we described mtDNA copy number depletion across many solid tumor types (Reznik et al., 2016). Here, we use orthogonal RNA-sequencing data to quantify mtDNA expression (mtRNA), and report analogously lower expression of mtRNA in tumors (relative to normal tissue) across a majority of cancer types...
January 18, 2017: ELife
https://www.readbyqxmd.com/read/28091351/supplementing-the-maternal-diet-of-rats-with-butyrate-enhances-mitochondrial-biogenesis-in-the-skeletal-muscles-of-weaned-offspring
#4
Yanping Huang, Shixing Gao, Guo Jun, Ruqian Zhao, Xiaojing Yang
The present study aimed to investigate the effects of maternal dietary butyrate supplementation on energy metabolism and mitochondrial biogenesis in offspring skeletal muscle and the possible mediating mechanisms. Virgin female rats were randomly assigned to either control or butyrate diets (1 % butyrate sodium) throughout gestation and lactation. At the end of lactation (21 d), the offspring were killed by exsanguination from the abdominal aorta under anaesthesia. The results showed that maternal butyrate supplementation throughout gestation and lactation did not affect offspring body weight...
January 16, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28087734/increased-mitophagy-in-the-skeletal-muscle-of-spinal-and-bulbar-muscular-atrophy-patients
#5
Doriana Borgia, Adriana Malena, Marco Spinazzi, Maria Andrea Desbats, Leonardo Salviati, Aaron P Russell, Giovanni Miotto, Laura Tosatto, Elena Pegoraro, Gianni Sorarù, Maria Pennuto, Lodovica Vergani
Spinal and bulbar muscular atrophy (SBMA) is a neuromuscular disorder caused by polyglutamine expansion in the androgen receptor (AR) and characterized by the loss of lower motor neurons. Here we investigated pathological processes occurring in muscle biopsy specimens derived from SBMA patients and, as controls, age-matched healthy subjects and patients suffering from amyotrophic lateral sclerosis (ALS) and neurogenic atrophy. We detected atrophic fibers in the muscle of SBMA, ALS and neurogenic atrophy patients...
January 13, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28078253/effects-of-eicosapentaenoic-acid-and-docosahexaenoic-acid-on-mitochondrial-dna-replication-and-pgc-1%C3%AE-gene-expression-in-c2c12-muscle-cells
#6
Mak-Soon Lee, Yoonjin Shin, Sohee Moon, Seunghae Kim, Yangha Kim
Mitochondrial biogenesis is a complex process requiring coordinated expression of nuclear and mitochondrial genomes. The peroxisome proliferator-activated receptor gamma co-activator 1-alpha (PGC-1α) is a key regulator of mitochondrial biogenesis, and it controls mitochondrial DNA (mtDNA) replication within diverse tissues, including muscle tissue. The aim of this study was to investigate the effects of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on mtDNA copy number and PGC-1α promoter activity in C2C12 muscle cells...
December 2016: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/28077604/the-mitochondrial-dna-content-of-cumulus-granulosa-cells-is-linked-to-embryo-quality
#7
V Desquiret-Dumas, A Clément, V Seegers, L Boucret, V Ferré-L'Hotellier, P E Bouet, P Descamps, V Procaccio, P Reynier, P May-Panloup
STUDY QUESTION: Could the mitochondrial DNA (mtDNA) content of cumulus granulosa cells (CGCs) be related to oocyte competence? SUMMARY ANSWER: The quality of embryos obtained during IVF procedures appears to be linked to mtDNA copy numbers in the CGCs. WHAT IS KNOWN ALREADY: Oocyte quality is linked to oocyte mtDNA content in the human and other species, and the mtDNA copy number of the oocyte is related to that of the corresponding CGCs. Moreover, the quantification of CGC mtDNA has recently been proposed as a biomarker of embryo viability...
January 6, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28077389/enhanced-oxidative-capacity-of-ground-squirrel-brain-mitochondria-during-hibernation
#8
Mallory A Ballinger, Christine Schwartz, Matthew T Andrews
During hibernation, thirteen-lined ground squirrels (Ictidomys tridecemlineatus) regularly cycle between bouts of torpor and interbout arousal (IBA).  Most of the brain is electrically quiescent during torpor, but regains activity quickly upon arousal to IBA resulting in extreme oscillations in energy demand during hibernation.  We predicted increased functional capacity of brain mitochondria during hibernation compared to spring to accommodate the variable energy demands of hibernation.  To address this hypothesis, we examined mitochondrial bioenergetics in the ground squirrel brain across three time points: spring (SP), torpor (TOR), and IBA...
January 11, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28070758/phylogeography-of-the-asian-rice-gall-midge-orseolia-oryzae-wood-mason-diptera-cecidomyiidae-in-thailand
#9
Solene Janique, Wantana Sriratanasak, Kulchana Ketsuwan, Jirapong Jairin, Ekgachai Jeratthitikul
The Asian rice gall midge (RGM) Orseolia oryzae (Wood Mason) (Diptera: Cecidomyiidae) is a major pest of rice, leading to yield losses in Thailand and many Asian countries. Despite an increasing number of reported midge outbreaks and the presence of many susceptible rice varieties, only a few studies have focused on the genetic variation of the midges. Therefore, we analyzed the phylogeography among Thai RGM populations covering north, northeast and central Thailand. Two mitochondrial DNA genes, cytochrome C oxidase I (COI) and 12S, and a non-coding repeat region (RR) situated just before COI were amplified...
January 9, 2017: Genetica
https://www.readbyqxmd.com/read/28069933/no-correlation-between-mtdna-amount-and-methylation-levels-at-the-cpg-island-of-polg-exon-2-in-wild-type-and-mutant-human-differentiated-cells
#10
Julie Steffann, Aurore Pouliet, Houda Adjal, Christine Bole, Cécile Fourrage, Jelena Martinovic, Louise Rolland-Galmiche, Agnes Rotig, Frédéric Tores, Arnold Munnich, Jean-Paul Bonnefont
BACKGROUND: While mitochondrial DNA (mtDNA) copy number is strictly regulated during differentiation and according to cell type, very little is known regarding the mechanism which accurately controls mtDNA copy number in human. Exon 2 of the human POLG gene, encoding the catalytic subunit of the mitochondrial-specific DNA polymerase gamma, contains a CpG island, highly conserved in mice and human. Changes of DNA methylation at the POLG locus have been shown to modulate mtDNA copy number during cell differentiation in both mouse and human...
January 9, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28030582/therapeutic-targeting-of-the-mitochondria-initiates-excessive-superoxide-production-and-mitochondrial-depolarization-causing-decreased-mtdna-integrity
#11
Kaytee L Pokrzywinski, Thomas G Biel, Dmitry Kryndushkin, V Ashutosh Rao
Mitochondrial dysregulation is closely associated with excessive reactive oxygen species (ROS) production. Altered redox homeostasis has been implicated in the onset of several diseases including cancer. Mitochondrial DNA (mtDNA) and proteins are particularly sensitive to ROS as they are in close proximity to the respiratory chain (RC). Mitoquinone (MitoQ), a mitochondria-targeted redox agent, selectively damages breast cancer cells possibly through damage induced via enhanced ROS production. However, the effects of MitoQ and other triphenylphosphonium (TPP+) conjugated agents on cancer mitochondrial homeostasis remain unknown...
2016: PloS One
https://www.readbyqxmd.com/read/28027964/characterization-of-bombyx-mori-mitochondrial-transcription-factor-a-a-conserved-regulator-of-mitochondrial-dna
#12
Megumi Sumitani, Mari Kondo, Katsumi Kasashima, Hitoshi Endo, Kaoru Nakamura, Toshihiko Misawa, Hiromitsu Tanaka, Hideki Sezutsu
In the present study, we initially cloned and characterized a mitochondrial transcription factor A (Tfam) homologue in the silkworm, Bombyx mori. Bombyx mori TFAM (BmTFAM) localized to mitochondria in cultured silkworm and human cells, and co-localized with mtDNA nucleoids in human HeLa cells. In an immunoprecipitation analysis, BmTFAM was found to associate with human mtDNA in mitochondria, indicating its feature as a non-specific DNA-binding protein. In spite of the low identity between BmTFAM and human TFAM (26...
December 24, 2016: Gene
https://www.readbyqxmd.com/read/28006017/mitochondrial-biomarkers-reflect-semen-quality-results-from-the-marchs-study-in-chongqing-china
#13
Guowei Zhang, Zhi Wang, Xi Ling, Peng Zou, Huan Yang, Qing Chen, Niya Zhou, Lei Sun, Jianfang Gao, Ziyuan Zhou, Jia Cao, Lin Ao
Unexplained infertility requires that more sensitive and mechanism-based biomarkers should be developed and used independently of or in addition to conventional semen parameters for an infertility diagnosis. In the present study, semen samples were collected from young men participating in the Male Reproductive Health in Chongqing College students (MARCHS) cohort study in the follow-up stage in 2014. Conventional semen parameters were measured in all 656 participants, whereas sperm mitochondrial membrane potential (MMP), mitochondrial DNA copy number (mtDNAcn), mtDNA integrity and apoptotic parameters were measured among 627, 386, 362, and 628 participants, respectively...
2016: PloS One
https://www.readbyqxmd.com/read/27997359/naked-mole-rats-maintain-healthy-skeletal-muscle-and-complex-iv-mitochondrial-enzyme-function-into-old-age
#14
Elizabeth A Stoll, Nevena Karapavlovic, Hannah Rosa, Michael Woodmass, Karolina Rygiel, Kathryn White, Douglass M Turnbull, Chris G Faulkes
The naked mole-rat (NMR) Heterocephalus glaber is an exceptionally long-lived rodent, living up to 32 years in captivity. This extended lifespan is accompanied by a phenotype of negligible senescence, a phenomenon of very slow changes in the expected physiological characteristics with age. One of the many consequences of normal aging in mammals is the devastating and progressive loss of skeletal muscle, termed sarcopenia, caused in part by respiratory enzyme dysfunction within the mitochondria of skeletal muscle fibers...
December 19, 2016: Aging
https://www.readbyqxmd.com/read/27993944/effects-of-airborne-toxicants-on-pulmonary-function-and-mitochondrial-dna-damage-in-rodent-lungs
#15
William L Rumsey, Brian Bolognese, Alicia B Davis, Pearl L Flamberg, Joseph P Foley, Steven R Katchur, Charles J Kotzer, Ruth R Osborn, Patricia L Podolin
Inhalation of airborne toxicants such as cigarette smoke and ozone is a shared health risk among the world's populations. The use of toxic herbicides like paraquat (PQ) is restricted by many countries, yet in the developing world PQ has demonstrable ill effects. The present study examined changes in pulmonary function, mitochondrial DNA (mtDNA) integrity and markers of DNA repair induced by acute or repeated exposure of PQ to rats. Similar to cigarette smoke and ozone, PQ promotes oxidative stress, and the impact of PQ on mtDNA was compared with that obtained with these agents...
December 18, 2016: Mutagenesis
https://www.readbyqxmd.com/read/27990297/hnrnpa2-is-a-novel-histone-acetyltransferase-that-mediates-mitochondrial-stress-induced-nuclear-gene-expression
#16
Manti Guha, Satish Srinivasan, Kip Guja, Edison Mejia, Miguel Garcia-Diaz, F Brad Johnson, Gordon Ruthel, Brett A Kaufman, Eric F Rappaport, M Rebecca Glineburg, Ji-Kang Fang, Andres Klein Szanto, Hiroshi Nakagawa, Jeelan Basha, Tapas Kundu, Narayan G Avadhani
Reduced mitochondrial DNA copy number, mitochondrial DNA mutations or disruption of electron transfer chain complexes induce mitochondria-to-nucleus retrograde signaling, which induces global change in nuclear gene expression ultimately contributing to various human pathologies including cancer. Recent studies suggest that these mitochondrial changes cause transcriptional reprogramming of nuclear genes although the mechanism of this cross talk remains unclear. Here, we provide evidence that mitochondria-to-nucleus retrograde signaling regulates chromatin acetylation and alters nuclear gene expression through the heterogeneous ribonucleoprotein A2 (hnRNAP2)...
2016: Cell Discovery
https://www.readbyqxmd.com/read/27984195/abnormal-mitochondrial-dynamics-and-impaired-mitochondrial-biogenesis-in-trigeminal-ganglion-neurons-in-a-rat-model-of-migraine
#17
Xin Dong, Xinying Guan, Keyan Chen, Shanquan Jin, Chengyun Wang, Lanyun Yan, Zhaochun Shi, Xue Zhang, Ling Chen, Qi Wan
Accumulating evidence has demonstrated a possible role of mitochondrial dysfunction in migraine pathophysiology. Migraine sufferers exhibit impaired metabolic capacity, with an increased formation of reactive oxygen species (ROS). Mitochondrial dynamics and mitochondrial biogenesis are key processes regulating mitochondrial homeostasis. The aim of this study was to explore the alterations of mitochondrial regulatory networks in a rat model of migraine induced by repeated dural stimulation with inflammatory soup (IS)...
October 28, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27959428/expression-pattern-of-dkk3-dickkopf-wnt-signaling-pathway-inhibitor%C3%A2-3-in-the-malignant-progression-of-oral-submucous-fibrosis
#18
Shanghui Zhou, Yun Zhu, Mubarak Mashrah, Xinyu Zhang, Zhijing He, Zhigang Yao, Chunye Zhang, Feng Guo, Yongjie Hu, Chenping Zhang
Oral squamous cell carcinoma (OSCC) is a common malignant neoplasm of the head and neck. Oral submucous fibrosis (OSF) is one of its pre-cancerous lesions; however, the key molecular events in the tumorigenesis of OSF remain elusive. Dickkopf WNT signaling pathway inhibitor 3 (DKK3) is one of the Wnt antagonists, and its downregulation and methylation have been reported in multiple malignancies, while no report of its expression in the carcinogenesis of OSF exists. In the present study, we investigated DKK3 expression at the protein and mRNA levels by immunochemical staining and semi‑quantitative RT-PCR in normal oral, OSF and OSCC tissues...
February 2017: Oncology Reports
https://www.readbyqxmd.com/read/27941687/low-dose-methylmercury-induced-genes-regulate-mitochondrial-biogenesis-via-mir-25-in-immortalized-human-embryonic-neural-progenitor-cells
#19
Xinjin Wang, Mengling Yan, Lina Zhao, Qing Wu, Chunhua Wu, Xiuli Chang, Zhijun Zhou
Mitochondria are essential organelles and important targets for environmental pollutants. The detection of mitochondrial biogenesis and generation of reactive oxygen species (ROS) and p53 levels following low-dose methylmercury (MeHg) exposure could expand our understanding of underlying mechanisms. Here, the sensitivity of immortalized human neural progenitor cells (ihNPCs) upon exposure to MeHg was investigated. We found that MeHg altered cell viability and the number of 5-ethynyl-2'-deoxyuridine (EdU)-positive cells...
December 9, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27937004/detecting-signatures-of-selection-within-the-tibetan-sheep-mitochondrial-genome
#20
Lili Niu, Xiaoyong Chen, Ping Xiao, Qianjun Zhao, Jingxuan Zhou, Jiangtao Hu, Hongxin Sun, Jiazhong Guo, Li Li, Linjie Wang, Hongping Zhang, Tao Zhong
Tibetan sheep, a Chinese indigenous breed, are mainly distributed in plateau and mountain-valley areas at a terrestrial elevation between 2260 and 4100 m. The herd is genetically distinct from the other domestic sheep and undergoes acclimatization to adapt to the hypoxic environment. To date, whether the mitochondrial DNA modification of Tibetan sheep shares the same feature as the other domestic breed remains unknown. In this study, we compared the whole mitogenome sequences from 32 Tibetan sheep, 22 domestic sheep and 24 commercial sheep to identify the selection signatures of hypoxic-tolerant in Tibetan sheep...
December 10, 2016: Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis
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