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chronological life span

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https://www.readbyqxmd.com/read/29790350/glutaredoxin-deletion-shortens-chronological-life-span-in-saccharomyces-cerevisiae-via-ros-mediated-ras-pka-activation
#1
Yan Liu, Fan Yang, Siying Li, Junbiao Dai, Haiteng Deng
Glutaredoxins (GRXs), small redox proteins that use reduced glutathione (GSH) as an electron donor, are key components of the cellular antioxidant system. In this study, we used Saccharomyces cerevisiae as a model system to investigate the effects of GRX deletion on yeast chronological life span (CLS). Deletion of either Grx1 or Grx2 shortened yeast CLS. Quantitative proteomics revealed that GRX deletion decreased expression of stress-response proteins, leading to increased cellular reactive oxygen species (ROS) accumulation and, subsequently, intracellular acidification...
May 23, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29750556/chronological-and-biological-age-predict-seasonal-reproductive-timing-an-investigation-of-clutch-initiation-and-telomeres-in-birds-of-known-age
#2
Carolyn M Bauer, Jessica L Graham, Mikus Abolins-Abols, Britt J Heidinger, Ellen D Ketterson, Timothy J Greives
Female vertebrates that breed earlier in the season generally have greater reproductive success. However, evidence suggests that breeding early may be costly, thus leading to the prediction that females with fewer future reproductive events will breed earlier in the season. While chronological age is a good indicator of remaining life span, telomere lengths may also be good biomarkers of longevity as they potentially reflect lifetime wear and tear (i.e., biological age). We examined whether variation in the timing of the first seasonal clutch was related to age and telomere length in female dark-eyed juncos (Junco hyemalis), predicting that older females and those with shorter telomeres would breed earlier...
June 2018: American Naturalist
https://www.readbyqxmd.com/read/29667924/telomerase-may-paradoxically-accelerate-aging-of-the-dna-methylome
#3
Andrew R Mendelsohn, James W Larrick
DNA methylation (DNAm) clocks such as the Horvath DNAm clock provide the most accurate biological determination of biological age relative to chronological age available today. However, there is little correlation between DNAm clocks, telomere-based aging clocks, and transcriptomic-based aging clocks. Recently, a genome-wide association study identified single-nucleotide polymorphism variants of TERT, the gene that encodes telomerase, as accelerating intrinsic aging in the Horvath DNAm clock. These same variants have been previously associated with long telomeres in leukocytes, suggesting that TERT acts paradoxically on telomere-associated aging and DNAm-associated aging...
April 2018: Rejuvenation Research
https://www.readbyqxmd.com/read/29575540/genomewide-mechanisms-of-chronological-longevity-by-dietary-restriction-in-budding-yeast
#4
Sergio E Campos, J Abraham Avelar-Rivas, Erika Garay, Alejandro Juárez-Reyes, Alexander DeLuna
Dietary restriction is arguably the most promising nonpharmacological intervention to extend human life and health span. Yet, only few genetic regulators mediating the cellular response to dietary restriction are known, and the question remains which other regulatory factors are involved. Here, we measured at the genomewide level the chronological lifespan of Saccharomyces cerevisiae gene deletion strains under two nitrogen source regimens, glutamine (nonrestricted) and γ-aminobutyric acid (restricted). We identified 473 mutants with diminished or enhanced extension of lifespan...
March 25, 2018: Aging Cell
https://www.readbyqxmd.com/read/29560271/natural-variation-of-chronological-aging-in-the-saccharomyces-cerevisiae-species-reveals-diet-dependent-mechanisms-of-life-span-control
#5
Paul P Jung, Zhi Zhang, Nicole Paczia, Christian Jaeger, Tomasz Ignac, Patrick May, Carole L Linster
Aging is a complex trait of broad scientific interest, especially because of its intrinsic link with common human diseases. Pioneering work on aging-related mechanisms has been made in Saccharomyces cerevisiae , mainly through the use of deletion collections isogenic to the S288c reference strain. In this study, using a recently published high-throughput approach, we quantified chronological life span (CLS) within a collection of 58 natural strains across seven different conditions. We observed a broad aging variability suggesting the implication of diverse genetic and environmental factors in chronological aging control...
2018: NPJ Aging and Mechanisms of Disease
https://www.readbyqxmd.com/read/29553494/orthotopic-ovarian-transplantation-procedures-to-investigate-the-life-and-health-span-influence-of-ovarian-senescence-in-female-mice
#6
Jeffrey B Mason, Kate C Parkinson, Tracy L Habermehl
Ovarian transplantation was first conducted at Utah State University in 1963. In more recent work, heterochronic transplantation of mammalian ovaries is being used to investigate the health-protective effects of young ovaries in young females. The current procedures employ an orthotopic transplantation method, where allogenic ovaries are transplanted back to their original position in the ovarian bursa. This is in contrast to the more commonly used heterotopic transplantation of ovaries/ovarian tissue subcutaneously or under the kidney capsule...
February 12, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29488278/an-augmented-aging-process-in-brain-white-matter-in-hiv
#7
Taylor Kuhn, Tobias Kaufmann, Nhat Trung Doan, Lars T Westlye, Jacob Jones, Rodolfo A Nunez, Susan Y Bookheimer, Elyse J Singer, Charles H Hinkin, April D Thames
OBJECTIVE: HIV infection and aging are both associated with neurodegeneration. However, whether the aging process alone or other factors associated with advanced age account for the progression of neurodegeneration in the aging HIV-positive (HIV+) population remains unclear. METHODS: HIV+ (n = 70) and HIV-negative (HIV-, n = 34) participants underwent diffusion tensor imaging (DTI) and metrics of microstructural properties were extracted from regions of interest (ROIs)...
June 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29421399/high-plasma-organochlorine-pesticide-levels-are-related-to-increased-biological-age-as-calculated-by-dna-methylation-analysis
#8
P Monica Lind, Samira Salihovic, Lars Lind
BACKGROUND: Organochlorine pesticides (OCPs) have been shown in the experimental setting to alter DNA methylation. Since DNA methylation changes during the life-span, formulas have been presented to calculate "DNA methylation age" as a measure of biological age. OBJECTIVES: We aimed to investigate if circulating levels of three OCPs were related to increased DNA methylation age METHODS: 71CpG DNA methylation age (Hannum formula) was calculated based on data from the Illumina 450 k Bead Methylation chip in 1000 subjects in the Prospective Study of the Vasculature in Uppsala Seniors (PIVUS) study (50% women, all aged 70 years at the examination)...
April 2018: Environment International
https://www.readbyqxmd.com/read/29277922/glutathione-levels-influence-chronological-life-span-of-saccharomyces-cerevisiae-in-a-glucose-dependent-manner
#9
Mayra Fabiola Tello-Padilla, Alejandra Yudid Perez-Gonzalez, Melina Canizal-García, Juan Carlos González-Hernández, Christian Cortes-Rojo, Ivanna Karina Olivares-Marin, Luis Alberto Madrigal-Perez
Diet plays a key role in determining the longevity of the organisms since it has been demonstrated that glucose restriction increases life span whereas a high-glucose diet decreases it. However, the molecular basis of how diet leads to the aging process is currently unknown. We propose that the quantity of glucose that fuels respiration influences reactive oxygen species generation and glutathione levels, and both chemical species impact in the aging process. Herein, we provide evidence that mutation of the gene GSH1 in Saccharomyces cerevisiae diminishes glutathione levels...
December 26, 2017: Yeast
https://www.readbyqxmd.com/read/29176034/selenium-preserves-keratinocyte-stemness-and-delays-senescence-by-maintaining-epidermal-adhesion
#10
Lara Jobeili, Patricia Rousselle, David Béal, Eric Blouin, Anne-Marie Roussel, Odile Damour, Walid Rachidi
Skin is constantly exposed to environmental factors such as pollutants, chemicals and ultra violet radiation (UV), which can induce premature skin aging and increase the risk of skin cancer. One strategy to reduce the effect of oxidative stress produced by environmental exposure is the application of antioxidant molecules. Among the endogenous antioxidants, selenoproteins play a key role in antioxidant defense and in maintaining a reduced cellular environment. Selenium, essential for the activity of selenoproteins, is a trace element that is not synthesized by organisms and must be supplied by diet or supplementation...
November 25, 2017: Aging
https://www.readbyqxmd.com/read/28851852/long-telomeres-do-not-affect-cellular-fitness-in-yeast
#11
Yaniv Harari, Shira Zadok-Laviel, Martin Kupiec
Telomeres, the ends of the eukaryotic chromosomes, help to maintain the genome's integrity and thus play important roles in aging and cancer. Telomere length is strictly controlled in all organisms. In humans, telomeres shorten with age, and it has been proposed that telomere shortening may play a causal role in aging. We took advantage of the availability of yeast strains with genetically or physiologically generated differences in telomere length to measure the effect that telomere length may have on cellular growth...
August 29, 2017: MBio
https://www.readbyqxmd.com/read/28780354/asymmetric-inheritance-of-the-yeast-chaperone-hsp26p-and-its-functional-consequences
#12
George Lytras, Ioannis Zacharioudakis, Dimitris Tzamarias
The yeast Hsp26 protein, a conserved a-crystallin small heatshock chaperone, is assembled in to oligomeric complexes, microscopically visible as distinct cytoplasmic foci. We studied at single cell resolution the dynamics of Hsp26p foci assembly, the mode of their inheritance in to progeny cells and the physiological significance of Hsp26p function. We showed that Hsp26p foci are formed upon cells' entry in to stationary phase, but upon re-entry to proliferation they are asymmetrically retained in the mother cells and are absent from the newborn daughters...
September 30, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28768809/2-hydroxyisobutyrylation-on-histone-h4k8-is-regulated-by-glucose-homeostasis-in-saccharomyces-cerevisiae
#13
Jing Huang, Zhouqing Luo, Wantao Ying, Qichen Cao, He Huang, Junkai Dong, Qingyu Wu, Yingming Zhao, Xiaohong Qian, Junbiao Dai
New types of modifications of histones keep emerging. Recently, histone H4K8 2-hydroxyisobutyrylation (H4K8hib ) was identified as an evolutionarily conserved modification. However, how this modification is regulated within a cell is still elusive, and the enzymes adding and removing 2-hydroxyisobutyrylation have not been found. Here, we report that the amount of H4K8hib fluctuates in response to the availability of carbon source in Saccharomyces cerevisiae and that low-glucose conditions lead to diminished modification...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28707178/life-span-retrieval-of-public-events-reminiscence-bump-for-high-impact-events-recency-for-others
#14
Ali I Tekcan, Aysecan Boduroglu, Aysu Mutlutürk, Aslı Aktan Erciyes
Although substantial evidence exists showing a reliable reminiscence bump for personal events, data regarding retrieval distributions for public events have been equivocal. The primary aim of the present study was to address life-span retrieval distributions of different types of public events in comparison to personal events, and to test whether the existing accounts of the bump can explain the distribution of public events. We asked a large national sample to report the most important, happiest, and saddest personal events and the most important, happiest, saddest, most proud, most fearful, and most shameful public events...
October 2017: Memory & Cognition
https://www.readbyqxmd.com/read/28569246/inactivation-of-rad52-and-hdf1-dna-repair-genes-leads-to-premature-chronological-aging-and-cellular-instability
#15
Silvia Mercado-Saenz, Beatriz Lopez-Diaz, Francisco Sendra-Portero, Manuel Martinez-Morillo, Miguel J Ruiz-Gomez
The present study aims to investigate the role of radiation sensitive 52 (RAD52) and high-affinity DNA binding factor 1 (HDF1) DNA repair genes on the life span of budding yeasts during chronological aging. Wild type (wt) and rad52, hdf1, and rad52 hdf1 mutant Saccharomyces cerevisiae strains were used. Chronological aging and survival assays were studied by clonogenic assay and drop test. DNA damage was analyzed by electrophoresis after phenol extraction. Mutant analysis, colony forming units and the index of respiratory competence were studied by growing on dextrose and glycerol plates as a carbon source...
June 2017: Journal of Biosciences
https://www.readbyqxmd.com/read/28551760/genetic-and-environmental-influences-on-longitudinal-trajectories-of-functional-biological-age-comparisons-across-gender
#16
Deborah Finkel, Ola Sternäng, Åke Wahlin
We used an alternate age variable, functional biological age (fBioAge), which was based on performance on functional body measures. The aim was to examine development of fBioAge across the adult life span, and to also examine potential gender differences and genetic and environmental influences on change with age. We used longitudinal data (n = 740; chronological age (ChronAge) range 45-85 at baseline) from the Swedish Adoption/Twin Study of Aging. The rate of increase in fBioAge was twice as fast after ChronAge 75 than before...
July 2017: Behavior Genetics
https://www.readbyqxmd.com/read/28401438/resveratrol-induces-mitochondrial-dysfunction-and-decreases-chronological-life-span-of-saccharomyces-cerevisiae-in-a-glucose-dependent-manner
#17
Minerva Ramos-Gomez, Ivanna Karina Olivares-Marin, Melina Canizal-García, Juan Carlos González-Hernández, Gerardo M Nava, Luis Alberto Madrigal-Perez
A broad range of health benefits have been attributed to resveratrol (RSV) supplementation in mammalian systems, including the increases in longevity. Nonetheless, despite the growing number of studies performed with RSV, the molecular mechanism by which it acts still remains unknown. Recently, it has been proposed that inhibition of the oxidative phosphorylation activity is the principal mechanism of RSV action. This mechanism suggests that RSV might induce mitochondrial dysfunction resulting in oxidative damage to cells with a concomitant decrease of cell viability and cellular life span...
June 2017: Journal of Bioenergetics and Biomembranes
https://www.readbyqxmd.com/read/28378095/measurement-of-muscle-health-in-aging
#18
Peter Francis, Mark Lyons, Mathew Piasecki, Jamie Mc Phee, Karen Hind, Philip Jakeman
Muscle health is a critical component in the struggle against physical frailty and the efforts to maintain metabolic health until the limit of chronological age. Consensus opinion is to evaluate muscle health in terms of muscle mass, strength and functional capability. There has been considerable variability in the components of muscle health which have been investigated in addition to variability in the tools of assessment and protocol for measurement. This is in stark contrast to the validated measurement of bone health across the adult life span...
December 2017: Biogerontology
https://www.readbyqxmd.com/read/28357388/balanced-coq6-biosynthesis-is-required-for-lifespan-and-mitophagy-in-yeast
#19
Isabel González-Mariscal, Aléjandro Martín-Montalvo, Cristina Ojeda-González, Adolfo Rodríguez-Eguren, Purificación Gutiérrez-Ríos, Plácido Navas, Carlos Santos-Ocaña
Coenzyme Q is an essential lipid with redox capacity that is present in all organisms. In yeast its biosynthesis depends on a multiprotein complex in which Coq7 protein has both catalytic and regulatory functions. Coq7 modulates CoQ6 levels through a phosphorylation cycle, where dephosphorylation of three amino acids (Ser/Thr) by the mitochondrial phosphatase Ptc7 increases the levels of CoQ6. Here we analyzed the role of Ptc7 and the phosphorylation state of Coq7 in yeast mitochondrial function. The conversion of the three Ser/Thr to alanine led to a permanently active form of Coq7 that caused a 2...
February 3, 2017: Microbial Cell
https://www.readbyqxmd.com/read/28329151/caloric-restriction-and-rapamycin-differentially-alter-energy-metabolism-in-yeast
#20
Kyung-Mi Choi, Seok-Jin Hong, Jan M van Deursen, Sooah Kim, Kyoung Heon Kim, Cheol-Koo Lee
Rapamycin (RM), a drug that inhibits the mechanistic target of rapamycin (mTOR) pathway and responds to nutrient availability, seemingly mimics the effects of caloric restriction (CR) on healthy life span. However, the extent of the mechanistic overlap between RM and CR remains incompletely understood. Here, we compared the impact of CR and RM on cellular metabolic status. Both regimens maintained intracellular ATP through the chronological aging process and showed enhanced mitochondrial capacity. Comparative transcriptome analysis showed that CR had a stronger impact on global gene expression than RM...
December 12, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
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