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Experimental Gerontology

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https://www.readbyqxmd.com/read/28433473/sex-difference-in-the-heat-shock-response-to-high-external-load-resistance-training-in-older-humans
#1
Rose Njemini, Louis Nuvagah Forti, Tony Mets, Evelien Van Roie, Walter Coudyzer, Ingo Beyer, Christophe Delecluse, Ivan Bautmans
BACKGROUND: Literature reports on the effects of resistance training on heat shock protein70 (Hsp70) adaptation in older subjects are scarce. Moreover, the optimum training load required to obtain a beneficial adaptation profile is lacking. Therefore, the aim of this study was to determine the effects of resistance training at various external loads on extracellular Hsp70 (eHsp70) resting levels in older humans. METHODS: Fifty-six community-dwelling older (68±5years) volunteers were randomized to 12weeks of resistance training (3×/week) at either high-resistance (HIGH, 8 males, 10 females, 2×10-15 repetitions at 80%1RM), low resistance (LOW, 9 Males, 10 Females, 1×80-100 repetitions at 20%1RM), or mixed low resistance (LOW+, 9 Males, 10 Females, 1×60 repetitions at 20%1RM followed by 1×10-20 repetitions at 40%1RM)...
April 19, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28433472/the-influence-of-platelet-rich-plasma-on-synovial-fluid-volumes-protein-concentrations-and-severity-of-pain-in-patients-with-knee-osteoarthritis
#2
Carl P C Chen, Chih-Hsiu Cheng, Chih-Chin Hsu, Hsin-Chin Lin, Yi-Rong Tsai, Jean-Lon Chen
Knee pain is commonly seen in orthopedic and rehabilitation outpatient clinical settings. Patients with knee osteoarthritis (OA) are often complicated with joint soreness, swelling, weakness, and pain. These complaints are often caused by the excessive amount of synovial fluid (SF) accumulated in the bursae around the knee joint. This study was aimed to evaluate the effectiveness of platelet rich plasma (PRP) in treating patients with minor to moderate knee osteoarthritis (OA) combined with supra-patellar bursitis using a proteomic approach and clinical evaluation tool...
April 19, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28412252/replicative-senescence-promotes-prothrombotic-responses-in-endothelial-cells-role-of-nadph-oxidase-and-cyclooxygenase-derived-oxidative-stress
#3
Grazielle Caroline da Silva, Malak Abbas, Sonia Khemais-Benkhiat, Melanie Burban, Thais Porto Ribeiro, Florence Toti, Noureddine Idris-Khodja, Steyner F Côrtes, Valérie B Schini-Kerth
Endothelial senescence has been suggested to promote endothelial dysfunction in age-related vascular disorders. This study evaluated the prothrombotic properties of senescent endothelial cells (ECs) and the underlying mechanism. Serial passaging from passage (P)1 to P4 (replicative senescence) of porcine coronary artery ECs, or treatment of P1 ECs with the endothelial nitric oxide synthase (eNOS) inhibitor L-NAME (premature senescence) induced acquisition of markers of senescence including increased senescence-associated-β-galactosidase (SA-β-gal) activity and p53, p21, p16 expression...
April 12, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28411010/effects-of-vitamin-d-and-resveratrol-on-metabolic-associated-markers-in-liver-and-adipose-tissue-from-samp8-mice
#4
Yehua Rui, Jinbo Cheng, Liqiang Qin, Cheng Shan, Jie Chang, Guiping Wang, Zhongxiao Wan
SAMP8 mice exhibit multiple metabolic characteristics associated with age, and it is a suitable candidate for researching aging associated metabolic dysfunction. OBJECTIVES: We aimed to 1) explore how key metabolic markers will be altered in both liver and adipose tissue with aging in SAMP8 mice; and 2) how the combination of vitamin D (VD) with resveratrol (RSV) will affect aging associated metabolic impairment in liver and adipose tissue from SAMP8 mice. METHODS: SAMP8 mice and their control SAMR1 mice were divided into 5 groups, i...
April 11, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28411009/skeletal-muscle-morphology-and-regulatory-signalling-in-endurance-trained-and-sedentary-individuals-the-influence-of-ageing
#5
U R Mikkelsen, J Agergaard, C Couppé, J F Grosset, A Karlsen, S P Magnusson, P Schjerling, M Kjaer, A L Mackey
Muscle mass in humans is inversely associated with circulating levels of inflammatory cytokines, but the interaction between ageing and training on muscle composition and the intra-muscular signalling behind inflammation and contractile protein synthesis and degradation is unknown. We studied 15 healthy life-long endurance runners, 12 age-matched untrained controls, 10 young trained and 12 young untrained individuals. Thigh muscle composition was investigated by magnetic resonance imaging (MRI), where non-contractile intramuscular tissue (NCIT) area (fat and connective tissue) was found to be greater in older but lower in trained individuals...
April 11, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28408160/physical-training-promotes-similar-effects-to-the-blockade-of-angiotensin-converting-enzyme-on-the-cardiac-morphology-and-function-in-old-female-rats-subjected-to-premature-ovarian-failure
#6
Ana Carolina S Felix, Sabrina G V Dutra, Ada C Gastaldi, Pâmela C Bonfim, Suenimeire Vieira, Hugo Celso Dutra de Souza
We investigated the effects of angiotensin-converting enzyme (ACE) inhibition and aerobic physical training on the heart of old female rats (82-wk-old) submitted to premature ovarian failure (10-wk.-old). We used different approaches: morphology and function by echocardiography, reactivity of the coronary bed and left ventricular contractibility (Langendorff Technique). Female Wistar ovariectomized (OVX) rats (n=42) were assigned to one of four groups: OVX, vehicle treated only; OVX-EM, Enalapril Maleate only (EM, 10mg·kg(-1)·d(-1)); OVX-T, aerobic trained only; and OVX-EMT, treated with Enalapril Maleate and aerobic trained...
April 10, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28404506/associations-of-24-hour-sleep-duration-and-ct-derived-measurements-of-muscle-and-bone-the-ages-reykjavik-study
#7
Elisa A Marques, Pedro Figueiredo, Vilmundur Gudnason, Thomas Lang, Gunnar Sigurdsson, Sigurdur Sigurdsson, Thor Aspelund, Kristin Siggeirsdottir, Lenore Launer, Gudny Eiriksdottir, Tamara B Harris
BACKGROUND: Although the importance of sleep on preservation of several physiological functions is well known, the relationship with the two interconnected tissues - muscle and bone is less understood. OBJECTIVES: This study aimed to examine the association of 24-hour sleep duration with mid-thigh muscle composition and proximal femur volumetric bone mineral density (vBMD). METHODS: 2438 men and 3326 women aged 66 to 96years, residents in the Reykjavik area, were included in this cross-sectional study...
April 9, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28392271/brain-derived-neurotrophic-factor-bdnf-serum-basal-levels-is-not-affected-by-power-training-in-mobility-limited-older-adults-a-randomized-controlled-trial
#8
L G Hvid, M K F Nielsen, C Simonsen, M Andersen, P Caserotti
Brain-derived neurotrophic factor (BDNF) is a potential important factor involved in neuroplasticity, and may be a mediator for eliciting adaptations in neuromuscular function and physical function in older individuals following physical training. As power training taxes the neural system to a very high extent, it may be particularly effective in terms of eliciting increases in systemic BDNF levels. We examined the effects of 12weeks of power training on mature BDNF (mBDNF) and total BDNF (tBDNF) in mobility-limited older adults from the Healthy Ageing Network of Competence (HANC) study...
April 6, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28385599/intramyocellular-lipid-content-and-lipogenic-gene-expression-responses-following-a-single-bout-of-resistance-type-exercise-differ-between-young-and-older-men
#9
Kostas Tsintzas, Francis B Stephens, Tim Snijders, Benjamin T Wall, Scott Cooper, Joanne Mallinson, Lex B Verdijk, Luc J C van Loon
The aim of this study was to examine the temporal relationship between intramyocellular lipid (IMCL) content and the expression of genes associated with IMCL turnover, fat metabolism, and inflammation during recovery from an acute bout of resistance type exercise in old versus young men. Seven healthy young (23±2years, 77.2±2.9kg) and seven healthy older (72±1years, 79.3±4.9kg) males performed a single bout of resistance exercise involving 6 sets of 10 repetitions of leg press and 6 sets of 10 repetitions of leg extension at 75% one-repetition maximum (1-RM)...
April 3, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28263867/mutation-and-catastrophe-in-the-aging-genome
#10
Brandon Milholland, Yousin Suh, Jan Vijg
In the 1960s, Leslie Orgel proposed what is now known as the error catastrophe theory of aging, arguing that errors in protein translation that reduce the fidelity of the protein-translating enzymes would lead to a feedback loop of increasingly inaccurate protein synthesis, terminating in the death of the organism. This mechanism of aging would be consistent with the exponential increase of mortality observed in humans, but the error catastrophe theory of aging has been generally disregarded by researchers due to a lack of evidence for an age-related increase in protein errors...
March 2, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28216411/a-summary-of-the-proceedings-of-the-thirteenth-international-symposium-on-the-neurobiology-and-neuroendocrinology-of-aging-bregenz-austria-july-17-22-2016
#11
EDITORIAL
Holly M Brown-Borg, Kurt E Borg
A summary of the Thirteenth International Symposium on the Neurobiology and Neuroendocrinology of Aging that was held July 17-22, 2016 in Bregenz, Austria, is presented. Twenty-one of the speakers that presented at the conference submitted review papers covering the topic of their presentation as well as an overview of their respective fields and are included in this special issue. The abstracts from each poster presentation as well as twenty-two of the speaker abstracts are also included at the end of the preface to the special issue...
February 16, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28213051/spontaneous-experimental-atherosclerosis-in-hypercholesterolemic-mice-advances-with-ageing-and-correlates-with-mitochondrial-reactive-oxygen-species
#12
Gabriel G Dorighello, Bruno A Paim, Ana Catarina R Leite, Anibal E Vercesi, Helena C F Oliveira
Ageing and atherosclerosis are associated with oxidative stress. Mitochondrial redox function declines with ageing. Here we tested whether ageing LDL receptor knockout mice (LDLr(-/-)) develop spontaneous atherosclerosis and whether mitochondrial reactive oxygen species (mtROS) correlate with atherosclerosis. Compared with young mice, aged LDLr(-/-) mice exhibited 20-fold larger aortic lesion size, although the plasma cholesterol levels did not vary between age groups. The lesion sizes increased exponentially from 3 to 24months of age (r=0...
February 14, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28167236/rapamycin-and-the-inhibition-of-the-secretory-phenotype
#13
Rong Wang, Bharath Sunchu, Viviana I Perez
Senescent cells contribute to age-related pathology and loss of function, and their selective removal improves physiological function and extends longevity. Cell senescence is a complex process that can be triggered by multiple challenges. Recently it has been observed that the composition of the secretory phenotype or SASP depends on the insult that triggers cell senescence. Rapamycin, an inhibitor of mTOR that increases longevity in several species, inhibits cell senescence in vitro, while silencing the Nrf2 gene induces premature senescence...
February 4, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28163132/aging-leads-to-altered-microglial-function-that-reduces-brain-resiliency-increasing-vulnerability-to-neurodegenerative-diseases
#14
REVIEW
Paula C Bickford, Antwoine Flowers, Bethany Grimmig
Aging is the primary risk factor for many neurodegenerative diseases. Thus, understanding the basic biological changes that take place with aging that lead to the brain being less resilient to disease progression of neurodegenerative diseases such as Parkinson's disease or Alzheimer's disease or insults to the brain such as stroke or traumatic brain injuries. Clearly this will not cure the disease per se, yet increasing the ability of the brain to respond to injury could improve long term outcomes. The focus of this review is examining changes in microglia with age and possible therapeutic interventions involving the use of polyphenol rich dietary supplements...
February 2, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28363433/improved-skeletal-muscle-mass-and-strength-after-heavy-strength-training-in-very-old-individuals
#15
Rasmus Leidesdorff Bechshøft, Nikolaj Mølkjær Malmgaard-Clausen, Bjørn Gliese, Nina Beyer, Abigail L Mackey, Jesper Løvind Andersen, Michael Kjær, Lars Holm
Age-related loss of muscle mass and function represents personal and socioeconomic challenges. The purpose of this study was to determine the adaptation of skeletal musculature in very old individuals (83+ years) performing 12weeks of heavy resistance training (3×/week) (HRT) compared to a non-training control group (CON). Both groups received similar protein supplementations. We studied 26 participants (86.9±3.2 (SD) (83-94, range) years old) per-protocol. Quadriceps cross-sectional area (CSA) differed between groups at post-test (P<0...
June 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28336316/effects-of-age-and-soybean-isoflavones-on-hepatic-cholesterol-metabolism-and-thyroid-hormone-availability-in-acyclic-female-rats
#16
Branka Šošić-Jurjević, Dieter Lütjohann, Ivana Jarić, Marko Miler, Danijela Vojnović Milutinović, Branko Filipović, Vladimir Ajdžanović, Kostja Renko, Eva Katrin Wirth, Snežana Janković, Josef Kӧhrle, Verica Milošević
Soy-food and its isoflavones, genistein (G) and daidzein (D), were reported to exert mild cholesterol-lowering effect, but the underlying mechanism is still unclear. In this research, first we studied age-related alterations in hepatic cholesterol metabolism of acyclic middle-aged (MA) female rats. Then we tested if purified isoflavones may prevent or reverse these changes, and whether putative changes in hepatic thyroid hormone availability may be associated with this effect. Serum and hepatic total cholesterol (TChol), bile acid and cholesterol precursors, as well as serum TSH and T4 concentrations, hepatic deiodinase (Dio) 1 enzyme activity and MCT8 protein expression were determined by comparing data obtained for MA with young adult (YA) intact (IC) females...
June 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28323025/ability-to-predict-resting-energy-expenditure-with-six-equations-compared-to-indirect-calorimetry-in-octogenarian-men
#17
Mikael Karlsson, Erika Olsson, Wulf Becker, Brita Karlström, Tommy Cederholm, Per Sjögren
The accuracy of predictive equations for calculating resting energy expenditure (REE) in elderly people has been questioned. Aging is associated with progressive declines in REE, which partly is explained by loss of fat free mass (FFM). Against this background we aimed to identify the most accurate predictive equation for REE in octogenarian men, taking body composition into account and using indirect calorimetry as reference value. REE was measured in 22 men (mean age 82.6±0.3years) and compared with six predictive equations: two based on FFM and four based on body weight, height and/or age...
June 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28323024/ppar%C3%AE-activation-by-mhy908-attenuates-age-related-renal-inflammation-through-modulation-of-the-ros-akt-foxo1-pathway
#18
Ye Ra Kim, Eun Kyeong Lee, Dae Hyun Kim, Kyung Mok Kim, Bonggi Lee, Hye Jin An, June Whoun Park, Kyoung Mi Moon, Min Hi Park, Ki Wung Chung, Ji Young Park, Seong Jin Kim, Hwi Young Yun, Sujin Son, Pusoon Chun, Hyung Ryong Moon, Hae Young Chung
2-[4-(5-Chlorobenzothiazothiazol-2-yl)phenoxy]-2-methyl-propionic acid (MHY908) has been shown to prevent insulin resistance-induced hyperinsulinemia in aged rats. However, the mechanism underlying MHY908-mediated amelioration of renal inflammation with insulin resistance during aging remains unknown. This study investigated the effects of MHY908 on age-related changes in the IRS/Akt/forkhead box (FoxO) 1 signaling pathway in the kidneys of aged rats and HEK293T cells. Experiments were performed in young, old, and MHY908-fed old rats (1mg or 3mg/kg/day MHY908 for 4 weeks)...
June 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28315788/does-baseline-innate-immunity-change-with-age-a-multi-year-study-in-great-tits
#19
Anke Vermeulen, Marcel Eens, Stefan Van Dongen, Wendt Müller
Throughout their life animals progressively accumulate mostly detrimental changes in cells, tissues and their functions, causing a decrease in individual performance and ultimately an increased risk of death. The latter may be amplified if it also leads to a deterioration of the immune system which forms the most important protection against the permanent threat of pathogens and infectious diseases. Here, we investigated how four baseline innate immune parameters (natural antibodies, complement activity, concentrations of haptoglobin and concentrations of nitric oxide) changed with age in free-living great tits (Parus major)...
June 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28315394/physical-activity-and-dietary-habits-related-to-cardiovascular-risk-in-independent-community-living-older-women
#20
A B Fraile-Bermúdez, M Kortajarena, I Zarrazquin, A Irazusta, A Fernandez-Atutxa, F Ruiz-Litago, J J Yanguas, J Gil, J Irazusta
A side effect of increased life expectancy is a surge in sequelae of diseases and injuries, which in turn increase the duration of life with disability among the elderly. The aim of this study was to ascertain the physical activity and nutritional parameters that better predict cardiovascular risk in a cohort of older women. A cross-sectional study was designed including 65 women able to independently perform basic activities of daily life. Data collection included anthropometric measurement, blood pressure measurement, blood analytics, objectively measurement of physical activity, and dietary assessment...
June 2017: Experimental Gerontology
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