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telomere length

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https://www.readbyqxmd.com/read/29150048/dna-dependent-protein-kinase-modulates-the-anti-cancer-properties-of-silver-nanoparticles-in-human-cancer-cells
#1
Hui Kheng Lim, Resham Lal Gurung, M Prakash Hande
Silver nanoparticles (Ag-np) were reported to be toxic to eukaryotic cells. These potentially detrimental effects of Ag-np can be advantageous in experimental therapeutics. They are currently being employed to enhance the therapeutic efficacy of cancer drugs. In this study, we demonstrate that Ag-np treatment trigger the activation of DNA-PKcs and JNK pathway at selected doses, presumably as a physiologic response to DNA damage and repair in normal and malignant cells. Ag-np altered the telomere dynamics by disrupting the shelterin complex located at the telomeres and telomere lengths...
December 2017: Mutation Research
https://www.readbyqxmd.com/read/29149592/dynamics-under-the-telomeric-bridge
#2
Sabrina Pisano, Eric Gilson, Marie-Josèphe Giraud-Panis
In this issue of Molecular Cell, Kim et al. (2017) have studied the structure and organization of the shelterin protein complex protecting telomeres in Schizosaccharomyces pombe and humans and discovered an allosteric structural transition that drives the formation of the shelterin complex and participates in telomere length regulation.
November 16, 2017: Molecular Cell
https://www.readbyqxmd.com/read/29149257/eleven-telomere-epigenetic-clock-and-biomarker-composite-quantifications-of-biological-aging-do-they-measure-the-same-thing
#3
Daniel W Belsky, Terrie E Moffitt, Alan A Cohen, David L Corcoran, Morgan E Levine, Joseph A Prinz, Jonathan Schaefer, Karen Sugden, Benjamin Williams, Richie Poulton, Avshalom Caspi
The geroscience hypothesis posits that therapies to slow biological processes of aging can prevent disease and extend healthy years of life. To test such "gero-protective" therapies in humans, outcome measures are needed that can assess extension of disease-free lifespan. This need has spurred development of different methods to quantify biological aging. But different methods have not been systematically compared in the same humans. We implemented seven methods to quantify biological aging using repeated-measures physiological and genomic data in 964 middle-aged humans in the Dunedin Study...
November 15, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/29148828/increased-cellular-aging-by-3-years-of-age-in-latino-preschool-children-who-consume-more-sugar-sweetened-beverages-a-pilot-study
#4
Janet M Wojcicki, Rosalinda Medrano, Jue Lin, Elissa Epel
BACKGROUND: Previous studies in adults and older children find that sugar-sweetened beverage (SSB) consumption increases risk for obesity and cellular aging, as measured by leukocyte telomere length (LTL). METHODS: In a previously described, San Francisco-based Latino birth cohort, where telomere length was measured at birth, we evaluate the relationship between beverage consumption (including SSB and 100% fruit juice), obesity, and LTL at 2-3 years old, as well as change in LTL from birth...
November 17, 2017: Childhood Obesity
https://www.readbyqxmd.com/read/29145644/paf1-and-ctr9-core-components-of-the-paf1-complex-maintain-low-levels-of-telomeric-repeat-containing-rna
#5
Joana Rodrigues, David Lydall
The conserved PAF1 complex (Cdc73, Paf1, Ctr9, Leo1 and Rtf1, in yeast), binds RNA pol II, and affects levels of many RNAs. Although PAF1 is a complex, there is evidence that different components perform different functions. In yeast, Cdc73, Paf1 and Ctr9 maintain normal telomerase RNA (TLC1) levels and affect telomere length. Here we report a new connection between the PAF1 complex and telomere biology. We show that Paf1 and Ctr9 maintain low telomere repeat containing RNA (TERRA) levels while Cdc73, Leo1 and Rtf1 have lesser effects...
November 14, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29145503/zinc-sulfate-contributes-to-promote-telomere-length-extension-via-increasing-telomerase-gene-expression-telomerase-activity-and-change-in-the-tert-gene-promoter-cpg-island-methylation-status-of-human-adipose-derived-mesenchymal-stem-cells
#6
Raheleh Farahzadi, Ezzatollah Fathi, Seyed Alireza Mesbah-Namin, Nosratollah Zarghami
The use of mesenchymal stem cells (MSCs) for cell therapy and regenerative medicine has received widespread attention over the past few years, but their application can be complicated by factors such as reduction in proliferation potential, the senescent tendency of the MSCs upon expansion and their age-dependent decline in number and function. It was shown that all the mentioned features were accompanied by a reduction in telomerase activity and telomere shortening. Furthermore, the role of epigenetic changes in aging, especially changes in promoter methylation, was reported...
2017: PloS One
https://www.readbyqxmd.com/read/29144994/gene-pathways-associated-with-mitochondrial-function-oxidative-stress-and-telomere-length-are-differentially-expressed-in-the-liver-of-rats-fed-lifelong-on-virgin-olive-sunflower-or-fish-oils
#7
Alfonso Varela-Lopez, María Patricia Pérez-López, César Luis Ramirez-Tortosa, Maurizio Battino, Sergio Granados-Principal, María Del Carmen Ramirez-Tortosa, Julio José Ochoa, Laura Vera-Ramirez, Francesca Giampieri, José Luis Quiles
This study investigates the effect of lifelong intake of different fat sources rich in monounsaturated (virgin olive oil), n6 polyunsaturated (sunflower oil) or n3 polyunsaturated (fish oil) fatty acids in the aged liver. Male Wistar rats fed lifelong on diets differing in the fat source were killed at 6 and at 24 months of age. Liver histopathology, mitochondrial ultrastructure, biogenesis, oxidative stress, mitochondrial electron transport chain, relative telomere length and gene expression profiles were studied...
September 20, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29143804/telomeres-and-telomerase-in-hematopoietic-dysfunction-prognostic-implications-and-pharmacological-interventions
#8
REVIEW
Theresa Vasko, Andrea Kaifie, Matthias B Stope, Thomas Kraus, Patrick Ziegler
Leukocyte telomere length (TL) has been suggested as a marker of biological age in healthy individuals, but can also reflect inherited and acquired hematopoietic dysfunctions or indicate an increased turnover of the hematopoietic stem and progenitor cell compartment. In addition, TL is able to predict the response rate of tyrosine kinase inhibitor therapy in chronic myeloid leukemia (CML), indicates clinical outcomes in chronic lymphocytic leukemia (CLL), and can be used as screening tool for genetic sequencing of selected genes in patients with inherited bone marrow failure syndromes (BMFS)...
October 28, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29143441/cellular-aging-dynamics-after-acute-malaria-infection-a-12-month-longitudinal-study
#9
Muhammad Asghar, Victor Yman, Manijeh Vafa Homann, Klara Sondén, Ulf Hammar, Dennis Hasselquist, Anna Färnert
Accelerated cellular aging and reduced lifespan have recently been shown in birds chronically infected with malaria parasites. Whether malaria infection also affects cellular aging in humans has not been reported. Here, we assessed the effect of a single acute Plasmodium falciparum malaria infection on cellular aging dynamics in travelers prospectively followed over one year in Sweden. DNA and RNA were extracted from venous blood collected at the time of admission and repeatedly up to one year. Telomere length was measured using real-time quantitative PCR, while telomerase activity and CDKN2A expression were measured by reverse transcriptase (RT)-qPCR...
November 16, 2017: Aging Cell
https://www.readbyqxmd.com/read/29143121/telomere-length-of-gallbladder-epithelium-is-shortened-in-patients-with-congenital-biliary-dilatation-measurement-by-quantitative-fluorescence-in-situ-hybridization
#10
Yuto Aoki, Junko Aida, Youichi Kawano, Ken-Ichi Nakamura, Naotaka Izumiyama-Shimomura, Naoshi Ishikawa, Tomio Arai, Yoshiharu Nakamura, Nobuhiko Taniai, Eiji Uchida, Kaiyo Takubo, Toshiyuki Ishiwata
BACKGROUND: Congenital biliary dilatation (CBD) is a congenital malformation involving both dilatation of the extrahepatic bile duct and pancreaticobiliary maljunction. Persistent reflux of pancreatic juice injures the biliary tract mucosa, resulting in chronic inflammation and higher rates of carcinogenesis in the biliary tract, including the gallbladder. Telomeres are repetitive DNA sequences located at the ends of chromosomes. Chromosomal instability due to telomere dysfunction plays an important role in the carcinogenesis of many organs...
November 15, 2017: Journal of Gastroenterology
https://www.readbyqxmd.com/read/29138179/association-between-leukocyte-telomere-length-and-the-risk-of-incident-atrial-fibrillation-the-framingham-heart-study
#11
Laila Staerk, Biqi Wang, Kathryn L Lunetta, Robert H Helm, Darae Ko, Jason A Sherer, Patrick T Ellinor, Steven A Lubitz, David D McManus, Ramachandran S Vasan, Emelia J Benjamin, Ludovic Trinquart
BACKGROUND: Advancing age is a prominent risk factor for atrial fibrillation (AF). Shorter telomere length is a biomarker of biological aging, but the link between shorter telomere length and increased risk of AF remains unclear. We examined the association between shorter leukocyte telomere length (LTL) and incident AF. METHODS AND RESULTS: We included AF-free participants from the observational Framingham Heart Study Offspring cohort from 1995 to 1998, who had LTL measurements...
November 14, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29130723/-telomeres-and-diet-quality
#12
Amelia Marti, Raquel Echeverría, Lydia Morell-Azanza, Ana Ojeda-Rodríguez
BACKGROUND: Few studies have evaluated the relationship between diet quality and telomere integrity in humans. Telomeres are regions of non-coding DNA localized at the end of each chromosome whose length, in addition to indicating life expectancy, indicates an overall health status. The objective of this systematic review is to compile the existing evidence on the relationship between telomere length and diet quality to further explore the impact that some nutrients, foods and dietary patterns may have on telomere homeostasis and therefore, in precision nutrition strategies...
October 24, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/29122549/chronic-low-dose-pro-oxidant-treatment-stimulates-transcriptional-activity-of-telomeric-retroelements-and-increases-telomere-length-in-drosophila
#13
Michala Korandová, Tomáš Krůček, Klára Szakosová, Dalibor Kodrík, Ronald P Kühnlein, Jindřiška Tomášková, Radmila Čapková Frydrychová
It has been proposed that oxidative stress, elicited by high levels of reactive oxygen species, accelerates telomere shortening by erosion of telomeric DNA repeats. While most eukaryotes counteract telomere shortening by telomerase-driven addition of these repeats, telomeric loss in Drosophila is compensated by retrotransposition of the telomeric retroelements HeT-A, TART and TAHRE to chromosome ends. In this study we tested the effect of chronic exposure of flies to non-/sub-lethal doses of paraquat, which is a redox cycling compound widely used to induce oxidative stress in various experimental paradigms including telomere length analyses...
November 6, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/29121940/plasma-irisin-is-elevated-in-type-2-diabetes-and-is-associated-with-increased-e-selectin-levels
#14
Karan S Rana, Chathyan Pararasa, Islam Afzal, David A Nagel, Eric J Hill, Clifford J Bailey, Helen R Griffiths, Ioannis Kyrou, Harpal S Randeva, Srikanth Bellary, James E Brown
BACKGROUND: Irisin is a hormone released mainly from skeletal muscle after exercise which increases adipose tissue energy expenditure. Adipocytes can also release irisin after exercise, acting as a local adipokine to induce white adipose tissue to take on a brown adipose tissue-like phenotype, suggesting that irisin and its receptor may represent a novel molecular target for the treatment of obesity and obesity-related diabetes. Previous reports provide conflicting evidence regarding circulating irisin levels in patients with type 2 diabetes (T2DM)...
November 9, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/29121254/impact-of-donor-and-recipient-human-cytomegalovirus-status-on-kidney-transplantation
#15
Maciej Zielinski, Agnieszka Tarasewicz, Hanna Zielinska, Magdalena Jankowska, Grazyna Moszkowska, Alicja Debska-Slizien, Boleslaw Rutkowski, Piotr Trzonkowski
Human cytomegalovirus (HCMV) is considered to be a major pathogen that affects the outcome of solid organ transplantation. Both recipient and donor may be HCMV positive, therefore HCMV reinfection is possible after transplantation. However, little is known how cytomegalovirus transmitted from an infected donor to an infected recipient modulates the recipient's already suppressed immunity, and what the clinical consequences are. To investigate these issues, 52 kidney recipients were followed up for two years after transplantation...
November 7, 2017: International Immunology
https://www.readbyqxmd.com/read/29119271/rnr1-s-role-in-telomere-elongation-cannot-be-replaced-by-rnr3-a-role-beyond-dntps
#16
REVIEW
André Maicher, Martin Kupiec
Telomeres, the nucleoprotein complexes at the end of eukaryotic chromosomes, protect them from degradation and ensure the replicative capacity of cells. In most human tumors and in budding yeast, telomere length is maintained by the activity of telomerase, an enzyme that adds dNTPs according to an internal RNA template. The dNTPs are generated with the help of the ribonucleotide reductase (RNR) complex. We have recently generated strains lacking the large subunit of RNR, Rnr1, which were kept viable by the expression of RNR complexes containing the Rnr1 homolog, Rnr3...
November 8, 2017: Current Genetics
https://www.readbyqxmd.com/read/29116388/the-evolutionarily-conserved-factor-sus1-eny2-plays-a-role-in-telomere-length-maintenance
#17
Amparo Galán, Encar García-Oliver, Carme Nuño-Cabanes, Linda Rubinstein, Martin Kupiec, Susana Rodríguez-Navarro
Sus1 is a conserved protein involved in histone H2B de-ubiquitination and mRNA export from the nucleus in eukaryotes. Previous studies implicated Sus1 partners in genome integrity including telomere homeostasis. However, the implication of Sus1 in telomere maintenance remains largely unknown. In this study, we found that yeast Sus1 interacts physically and genetically with factors involved in telomere maintenance and its absence leads to elongated telomeres. Deletion of several of Sus1's partners also leads to longer telomeres...
November 7, 2017: Current Genetics
https://www.readbyqxmd.com/read/29116081/a-method-for-measuring-the-distribution-of-the-shortest-telomeres-in-cells-and-tissues
#18
Tsung-Po Lai, Ning Zhang, Jungsik Noh, Ilgen Mender, Enzo Tedone, Ejun Huang, Woodring E Wright, Gaudenz Danuser, Jerry W Shay
Improved methods to measure the shortest (not just average) telomere lengths (TLs) are needed. We developed Telomere Shortest Length Assay (TeSLA), a technique that detects telomeres from all chromosome ends from <1 kb to 18 kb using small amounts of input DNA. TeSLA improves the specificity and efficiency of TL measurements that is facilitated by user friendly image-processing software to automatically detect and annotate band sizes, calculate average TL, as well as the percent of the shortest telomeres...
November 7, 2017: Nature Communications
https://www.readbyqxmd.com/read/29115638/the-shortening-telomere-length-of-t-lymphocytes-maybe-associated-with-hyper%C3%A2-function-in-servere-aplastic-anemia
#19
Chaomeng Wang, Tian Zhang, Yihao Wang, Yang Li, Chunyan Liu, Hui Liu, Lijuan Li, Kai Ding, Ting Wang, Honglei Wang, Zonghong Shao, Rong Fu
Severe aplastic anemia (SAA) is a primary disorder of severe bone marrow failure characterizing with extreme pancytopenia and a profound diminution of bone marrow progenitor cells, which is associated with T cell hyper‑function. Abnormal telomere shortening of bone marrow mononuclear cell has been reported in AA, which may lead to genomic instability, and result in cell senescence or apoptosis. Notably, certain studies identfieid that lymphocytes of shortening telomere length have undergone apoptosis escape in autoimmune diseases...
November 8, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29113331/cross-sectional-associations-between-genetic-polymorphisms-in-metabolic-enzymes-and-longer-leukocyte-telomere-length-induced-by-omethoate
#20
Xiaoran Duan, Yongli Yang, Sihua Wang, Xiaolei Feng, Tuanwei Wang, Pengpeng Wang, Suxiang Liu, Lei Li, Guoyu Li, Wu Yao, Liuxin Cui, Wei Wang
Purpose: This study aimed to explore the effects of genetic polymorphisms in metabolic enzymes on relative telomere length changes and explore the mechanism of canceration induced by omethoate. Materials and Methods: 180 long-term omethoate-exposed workers and 115 healthy controls were recruited. Real-time PCR method was applied to determine the relative telomere length in peripheral blood leukocytes DNA, and Six polymorphic loci of GSTT1(+/-), GSTM1(+/-), GSTP1 rs1695, CYP2E1 rs6413432, CYP2E1 rs3813867 and PON2 rs12026 were detected by polymerase chain reaction and restriction fragment length polymorphism method; Multiple linear regression was conducted to explore the effects of omethoate exposure and genetic polymorphisms on the telomere length...
October 6, 2017: Oncotarget
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