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Ageing Research Reviews

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https://www.readbyqxmd.com/read/28802803/metformin-reduces-all-cause-mortality-and-diseases-of-ageing-independent-of-its-effect-on-diabetes-control-a-systematic-review-and-meta-analysis
#1
REVIEW
Jared M Campbell, Susan M Bellman, Matthew D Stephenson, Karolina Lisy
This systematic review investigated whether the insulin sensitiser metformin has a geroprotective effect in humans. Pubmed and Embase were searched along with databases of unpublished studies. Eligible research investigated the effect of metformin on all-cause mortality or diseases of ageing relative to non-diabetic populations or diabetics receiving other therapies with adjustment for disease control achieved. Overall, 260 full-texts were reviewed and 53 met the inclusion criteria. Diabetics taking metformin had significantly lower all-cause mortality than non-diabetics (hazard ratio (HR)=0...
August 9, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28789901/sirtuins-epigenetics-and-longevity
#2
REVIEW
Mateusz Wątroba, Ilona Dudek, Marta Skoda, Aleksandra Stangret, Przemysław Rzodkiewicz, Dariusz Szukiewicz
Aging of organisms begins from a single cell at the molecular level. It includes changes related to telomere shortening, cell senescence and epigenetic modifications. These processes accumulate over the lifespan. Research studies show that epigenetic signaling contributes to human disease, tumorigenesis and aging. Epigenetic DNA modifications involve changes in the gene activity but not in the DNA sequence. An epigenome consists of chemical modifications to the DNA and histone proteins without the changes in the DNA sequence...
August 5, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28774716/aging-and-osteoarthritis-central-role-of-the-extracellular-matrix
#3
REVIEW
Maryam Rahmati, Giovanna Nalesso, Ali Mobasheri, Masoud Mozafari
Osteoarthritis (OA), is a major cause of severe joint pain, physical disability and quality of life impairment in the aging population across the developed and developing world. Increased catabolism in the extracellular matrix (ECM) of the articular cartilage is a key factor in the development and progression of OA. The molecular mechanisms leading to an impaired matrix turnover have not been fully clarified, however cellular senescence, increased expression of inflammatory mediators as well as oxidative stress in association with an inherently limited regenerative potential of the tissue, are all important contributors to OA development...
July 31, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28757291/protein-aggregation-cardiovascular-diseases-and-exercise-training-where-do-we-stand
#4
Marisol Gouveia, Ke Xia, Wilfredo Colón, Sandra I Vieira, Fernando Ribeiro
Cells ensure their protein quality control through the proteostasis network. Aging and age-related diseases, such as neurodegenerative and cardiovascular diseases, have been associated to the reduction of proteostasis network efficiency and, consequently, to the accumulation of protein misfolded aggregates. The decline in protein homeostasis has been associated with the development and progression of atherosclerotic cardiovascular disease, cardiac hypertrophy, cardiomyopathies, and heart failure. Exercise training is a key component of the management of patients with cardiovascular disease, consistently improving quality of life and prognosis...
July 28, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28755870/use-of-near-infrared-spectroscopy-in-the-investigation-of-brain-activation-during-cognitive-aging-a-systematic-review-of-an-emerging-area-of-research
#5
REVIEW
Nounagnon F Agbangla, Michel Audiffren, Cédric T Albinet
The cognitive neuroscience of aging is a growing and stimulating research area. The development of neuroimaging techniques in the past two decades has considerably increased our understanding of the brain mechanisms that might underlie cognitive performance and resulting changes due to normal aging. Beside traditional metabolic neuroimaging techniques, such as Positron Emission Tomography and functional Magnetic Resonance Imaging, near infrared spectroscopy (NIRS), an optical imaging technique allowing to monitor real-time cerebral blood oxygenation, has gained recent interest in this field...
July 26, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28736117/modulation-of-dendritic-cell-and-t-cell-cross-talk-during-aging-the-potential-role-of-checkpoint-inhibitory-molecules
#6
REVIEW
Joanne K Gardner, Cyril D S Mamotte, Connie Jackaman, Delia J Nelson
Dendritic cells (DCs) undergo continuous changes throughout life, and there is evidence that elderly DCs have a reduced capacity to stimulate T cells, which may contribute to impaired anti-tumour immune responses in elderly people with cancer. Changes in checkpoint inhibitory molecules/pathways during aging may be one mechanism that impairs the ability of elderly DCs to activate T cells. However, little is currently known regarding the combined effects of aging and cancer on DC and T cell inhibitory molecules/pathways...
July 20, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28709692/ampk-orchestrates-an-elaborate-cascade-protecting-tissue-from-fibrosis-and-aging
#7
REVIEW
Shuai Jiang, Tian Li, Zhi Yang, Wei Yi, Shouyin Di, Yang Sun, Dongjin Wang, Yang Yang
Fibrosis is a common process characterized by excessive extracellular matrix (ECM) accumulation after inflammatory injury, which is also a crucial cause of aging. The process of fibrosis is involved in the pathogenesis of most diseases of the heart, liver, kidney, lung, and other organs/tissues. However, there are no effective therapies for this pathological alteration. Annually, fibrosis represents a huge financial burden for the USA and the world. 5'-AMP-activated protein kinase (AMPK) is a pivotal energy sensor that alleviates or delays the process of fibrogenesis...
July 12, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28689042/historical-demography-and-longevity-genetics-back-to-the-future
#8
REVIEW
Niels van den Berg, Marian Beekman, Ken Robert Smith, Angelique Janssens, Pieternella Eline Slagboom
Research into the genetic component of human longevity can provide important insights in mechanisms that may protect against age-related diseases and multi-morbidity. Thus far only a limited number of robust longevity loci have been detected in either candidate or genome wide association studies. One of the issues in these genetic studies is the definition of the trait being either lifespan, including any age at death or longevity, i.e. survival above a diverse series of thresholds. Likewise heritability and segregation research have conflated lifespan with longevity...
July 5, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28676286/a-viewpoint-on-considering-physiological-principles-to-study-stress-resistance-and-resilience-with-aging
#9
REVIEW
Benjamin F Miller, Douglas R Seals, Karyn L Hamilton
Adaptation to stress is identified as one of the seven pillars of aging research. Our viewpoint discusses the importance of the distinction between stress resistance and resilience, highlights how integration of physiological principles is critical for further understanding in vivo stress resistance and resilience, and advocates for the use of early warning signs to prevent a tipping point in stress resistance and resilience.
July 1, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28648951/physical-activity-and-healthy-ageing-a-systematic-review-and-meta-analysis-of-longitudinal-cohort-studies
#10
REVIEW
C Daskalopoulou, B Stubbs, C Kralj, A Koukounari, M Prince, A M Prina
BACKGROUND: Older people constitute a significant proportion of the total population and their number is projected to increase by more than half by 2030. This increasing probability of late survival comes with considerable individual, economic and social impact. Physical activity (PA) can influence the ageing process but the specific relationship with healthy ageing (HA) is unclear. METHODS: We conducted a systematic review and meta-analysis of longitudinal studies examining the associations of PA with HA...
June 23, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28610949/calorie-restriction-in-rodents-caveats-to-consider
#11
REVIEW
Donald K Ingram, Rafael de Cabo
The calorie restriction paradigm has provided one of the most widely used and most useful tools for investigating mechanisms of aging and longevity. By far, rodent models have been employed most often in these endeavors. Over decades of investigation, claims have been made that the paradigm produces the most robust demonstration that aging is malleable. In the current review of the rodent literature, we present arguments that question the robustness of the paradigm to increase lifespan and healthspan. Specifically, there are several questions to consider as follows: (1) At what age does CR no longer produce benefits? (2) Does CR attenuate cognitive decline? (3) Are there negative effects of CR, including effects on bone health, wound healing, and response to infection? (4) How important is schedule of feeding? (5) How long does CR need to be imposed to be effective? (6) How do genotype and gender influence CR? (7) What role does dietary composition play? Consideration of these questions produce many caveats that should guide future investigations to move the field forward...
June 10, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28647612/evolution-of-human-apolipoprotein-e-apoe-isoforms-gene-structure-protein-function-and-interaction-with-dietary-factors
#12
REVIEW
Patricia Huebbe, Gerald Rimbach
Apolipoprotein E (APOE) is a member of the vertebrate protein family of exchangeable apolipoproteins that is characterized by amphipathic α-helices encoded by multiple nucleotide tandem repeats. Its equivalent in flying insects - apolipophorin-III - shares structural and functional commonalities with APOE, suggesting the possibility of an evolutionary relationship between the proteins. In contrast to all other known species, human APOE is functionally polymorphic and possesses three major allelic variants (ε4, ε3 and ε2)...
August 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28624530/the-emerging-role-of-wnt-signaling-dysregulation-in-the-understanding-and-modification-of-age-associated-diseases
#13
REVIEW
Lizbeth García-Velázquez, Clorinda Arias
Wnt signaling is a highly conserved pathway that participates in multiple aspects of cellular function during development and in adults. In particular, this pathway has been implicated in cell fate determination, proliferation and cell polarity establishment. In the brain, it contributes to synapse formation, axonal remodeling, dendrite outgrowth, synaptic activity, neurogenesis and behavioral plasticity. The expression and distribution of Wnt components in different organs vary with age, which may have important implications for preserving tissue homeostasis...
August 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28587957/role-of-physical-exercise-on-cognitive-function-in-healthy-older-adults-a-systematic-review-of-randomized-clinical-trials
#14
REVIEW
Mikel López Sáez de Asteasu, Nicolás Martínez-Velilla, Fabricio Zambom-Ferraresi, Álvaro Casas-Herrero, Mikel Izquierdo
Cognitive impairment has a harmful effect on quality of life, is associated with functional limitations and disability in older adults. Physical activity (PA) has shown to have beneficial effects on cognition but the results and conclusions of randomized controlled trials (RCTs) are less consistent. Update of knowledge was necessary to examine the effects on cognitive function of new training modalities developed in recent years, such as multicomponent exercise training. Therefore, the purpose of this review was to examine the role of multicomponent training versus aerobic or resistance training alone on cognition in healthy older adults (>65 years) without known cognitive impairment...
August 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28579130/vascular-aging-molecular-mechanisms-and-potential-treatments-for-vascular-rejuvenation
#15
REVIEW
Panagiotis Mistriotis, Stelios T Andreadis
Aging is the main risk factor contributing to vascular dysfunction and the progression of vascular diseases. In this review, we discuss the causes and mechanisms of vascular aging at the tissue and cellular level. We focus on Endothelial Cell (EC) and Smooth Muscle Cell (SMC) aging due to their critical role in mediating the defective vascular phenotype. We elaborate on two categories that contribute to cellular dysfunction: cell extrinsic and intrinsic factors. Extrinsic factors reflect systemic or environmental changes which alter EC and SMC homeostasis compromising vascular function...
August 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28552720/remote-tissue-conditioning-an-emerging-approach-for-inducing-body-wide-protection-against-diseases-of-ageing
#16
REVIEW
Boaz Kim, Alice Brandli, John Mitrofanis, Jonathan Stone, Sivaraman Purushothuman, Daniel M Johnstone
We have long accepted that exercise is 'good for us'; that - put more rigorously - moderate exercise is associated with not just aerobic fitness but also reduced morbidity and reduced mortality from cardiovascular disease and even malignancies. Caloric restriction (moderate hunger) and our exposure to dietary phytochemicals are also emerging as stresses which are 'good for us' in the same sense. This review focuses on an important extension of this concept: that stress localized within the body (e.g. in a limb) can induce resilience in tissues throughout the body...
August 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28552719/regulation-of-longevity-by-fgf21-interaction-between-energy-metabolism-and-stress-responses
#17
REVIEW
Antero Salminen, Kai Kaarniranta, Anu Kauppinen
Fibroblast growth factor 21 (FGF21) is a hormone-like member of FGF family which controls metabolic multiorgan crosstalk enhancing energy expenditure through glucose and lipid metabolism. In addition, FGF21 acts as a stress hormone induced by endoplasmic reticulum stress and dysfunctions of mitochondria and autophagy in several tissues. FGF21 also controls stress responses and metabolism by modulating the functions of somatotropic axis and hypothalamic-pituitary-adrenal (HPA) pathway. FGF21 is a potent longevity factor coordinating interactions between energy metabolism and stress responses...
August 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28511964/evidence-on-multimorbidity-from-definition-to-intervention-an-overview-of-systematic-reviews
#18
REVIEW
Xiaolin Xu, Gita D Mishra, Mark Jones
The increasing challenge of multiple chronic diseases (multimorbidity) requires more evidence-based knowledge and effective practice. In order to better understand the existing evidence on multimorbidity, we performed a systematic review of systematic reviews on multimorbidity with pre-established search strategies and exclusion criteria by searching multiple databases and grey literature. Of 8006 articles found, 53 systematic reviews (including meta-analysis and qualitative research synthesis performed in some reviews) that stated multimorbidity as the main focus were included, with 79% published during 2013-2016...
August 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28499883/the-role-of-5-hydroxymethylcytosine-in-development-aging-and-age-related-diseases
#19
REVIEW
V López, A F Fernández, M F Fraga
DNA methylation at the fifth position of cytosines (5mC) represents a major epigenetic modification in mammals. The recent discovery of 5-hydroxymethylcytosine (5hmC), resulting from 5mC oxidation, is redefining our view of the epigenome, as multiple studies indicate that 5hmC is not simply an intermediate of DNA demethylation, but a genuine epigenetic mark that may play an important functional role in gene regulation. Currently, the availability of platforms that discriminates between the presence of 5mC and 5hmC at single-base resolution is starting to shed light on the functions of 5hmC...
August 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28487242/oxidative-stress-genomic-features-and-dna-repair-in-frail-elderly-a-systematic-review
#20
REVIEW
María Sánchez-Flores, Diego Marcos-Pérez, Solange Costa, João Paulo Teixeira, Stefano Bonassi, Eduardo Pásaro, Blanca Laffon, Vanessa Valdiglesias
Frailty is an emerging geriatric syndrome characterized by higher vulnerability to stressors, with an increased risk of adverse health outcomes such as mortality, morbidity, disability, hospitalization, and institutionalization. Although it is generally recognized to have a biological basis, no particular biological trait has been consistently associated to frailty status so far. In this work, epidemiological studies evaluating association of frailty status with alterations at cellular level - namely oxidative stress, genomic instability and DNA damage and repair biomarkers -were revised and compared...
August 2017: Ageing Research Reviews
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