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Wilkinson MJ, Selman C, McLaughlin L, Horan L, Hamilton L, Gilbert C, Chadwick C, Flynn JN. Progressing the care, husbandry and management of ageing mice used in scientific studies. Lab Anim 2019; 54:225-238. [PMID: 31403890 PMCID: PMC7301645 DOI: 10.1177/0023677219865291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Driven by the longer lifespans of humans, particularly in Westernised societies, and the need to know more about ‘healthy ageing’, ageing mice are being used increasingly in scientific research. Many departments and institutes involved with ageing research have developed their own systems to determine intervention points for potential refinements and to identify humane end points. Several good systems are in use, but variations between them could contribute to poor reproducibility of the science achieved. Working with scientific and regulatory communities in the UK, we have reviewed the clinical signs observed in ageing mice and developed recommendations for enhanced monitoring, behaviour assessment, husbandry and veterinary interventions. We advocate that the default time point for enhanced monitoring should be 15 months of age, unless prior information is available. Importantly, the enhanced monitoring should cause no additional harms to the animals. Where a mouse strain is well characterised, the onset of age-related enhanced monitoring may be modified based on knowledge of the onset of an expected age-related clinical sign. In progeroid models where ageing is accelerated, enhanced monitoring may need to be brought forward. Information on the background strain must be considered, as it influences the onset of age-related clinical signs. The range of ageing models currently used means that there will be no ‘one-size fits all’ solution. Increased awareness of the issues will lead to more refined and consistent husbandry of ageing mice, and application of humane end points will help to reduce the numbers of animals maintained for longer than is scientifically justified.
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Affiliation(s)
| | - Colin Selman
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, UK
| | | | - Linda Horan
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, UK
| | | | | | | | - J Norman Flynn
- Animals in Science Regulation Unit (ASRU), Home Office, UK
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202
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Martínez de Toda I, Vida C, Sanz San Miguel L, De la Fuente M. When will my mouse die? Life span prediction based on immune function, redox and behavioural parameters in female mice at the adult age. Mech Ageing Dev 2019; 182:111125. [PMID: 31381890 DOI: 10.1016/j.mad.2019.111125] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 07/02/2019] [Accepted: 07/24/2019] [Indexed: 11/26/2022]
Abstract
The identification of predictive markers of life span would help to unravel the underlying mechanisms influencing ageing and longevity. For this aim, 30 variables including immune functions, inflammatory-oxidative stress state and behavioural characteristics were investigated in ICR-CD1 female mice at the adult age (N = 38). Mice were monitored individually until they died and individual life spans were registered. Multiple linear regression was carried out to construct an Immunity model (adjusted R2 = 75.8%) comprising Macrophage chemotaxis and phagocytosis and Lymphoproliferation capacity, a Redox model (adjusted R2 = 84.4%) involving Reduced Glutathione and Malondialdehyde concentrations and Glutathione Peroxidase activity and a Behavioural model (adjusted R2 = 79.8%) comprising Internal Locomotion and Time spent in open arms indices. In addition, a Combined model (adjusted R2 = 92.4%) and an Immunity-Redox model (adjusted R2 = 88.7%) were also constructed by combining the above-mentioned selected variables. The models were also cross-validated using two different sets of female mice (N = 30; N = 40). Correlation between predicted and observed life span was 0.849 (P < 0.000) for the Immunity model, 0.691 (P < 0.000) for the Redox, 0.662 (P < 0.000) for the Behavioural and 0.840 (P < 0.000) for the Immunity-Redox model. Thus, these results provide a new perspective on the use of immune function, redox and behavioural markers as prognostic tools in ageing research.
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Affiliation(s)
- Irene Martínez de Toda
- Department of Genetics, Physiology and Microbiology (Unit of Animal Physiology), Faculty of Biology, Complutense University, Madrid, Spain; Institute of Investigation Hospital 12 Octubre, Madrid, Spain
| | - Carmen Vida
- Department of Genetics, Physiology and Microbiology (Unit of Animal Physiology), Faculty of Biology, Complutense University, Madrid, Spain; Institute of Investigation Hospital 12 Octubre, Madrid, Spain
| | - Luis Sanz San Miguel
- Department of Statistics and Operational Research, Faculty of Mathematics, Complutense University, Madrid, Spain
| | - Mónica De la Fuente
- Department of Genetics, Physiology and Microbiology (Unit of Animal Physiology), Faculty of Biology, Complutense University, Madrid, Spain; Institute of Investigation Hospital 12 Octubre, Madrid, Spain.
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203
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Heinze-Milne S, Banga S, Howlett S. Frailty Assessment in Animal Models. Gerontology 2019; 65:610-619. [DOI: 10.1159/000501333] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 06/05/2019] [Indexed: 11/19/2022] Open
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204
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Kane AE, Howlett SE. Spelunking the biology of frailty. Mech Ageing Dev 2019; 182:111123. [PMID: 31301316 DOI: 10.1016/j.mad.2019.111123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Alice E Kane
- Department of Genetics, Harvard Medical School, Boston, MA, USA; Charles Perkins Centre, The University of Sydney, Sydney, Australia.
| | - Susan E Howlett
- Department of Pharmacology, Dalhousie University, Halifax, NS, Canada; Department of Medicine (Geriatric Medicine), Dalhousie University, Halifax, NS, Canada.
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205
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Kane AE, Sinclair DA. Frailty biomarkers in humans and rodents: Current approaches and future advances. Mech Ageing Dev 2019; 180:117-128. [PMID: 31002925 PMCID: PMC6581034 DOI: 10.1016/j.mad.2019.03.007] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 03/14/2019] [Accepted: 03/27/2019] [Indexed: 12/16/2022]
Abstract
Even though they would have great benefit across research and clinical fields, currently there are no accepted biomarkers of frailty. Cross-sectional studies in humans have identified promising candidates including inflammatory markers such as IL-6, immune markers such as WBC count, clinical markers such as albumin, endocrine markers such as vitamin D, oxidative stress markers such as isoprostanes, proteins such as BDNF and epigenetic markers such as DNA methylation, but there are limitations to the current state of the research. Future approaches to the identification of frailty biomarkers should include longitudinal studies, studies using animal models of frailty, studies incorporating novel biomarkers combined into composite panels, and studies investigating sex differences and potential overlap between markers of biological age and frailty.
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Affiliation(s)
- Alice E Kane
- Department of Genetics, Harvard Medical School, Boston, MA, USA; Charles Perkins Centre, The University of Sydney, Sydney, Australia.
| | - David A Sinclair
- Department of Genetics, Harvard Medical School, Boston, MA, USA; Department of Pharmacology, The University of New South Wales, Sydney, Australia.
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206
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Age-related deficit accumulation and the diseases of ageing. Mech Ageing Dev 2019; 180:107-116. [DOI: 10.1016/j.mad.2019.04.005] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 04/10/2019] [Accepted: 04/15/2019] [Indexed: 12/25/2022]
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207
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Trendelenburg A, Scheuren A, Potter P, Müller R, Bellantuono I. Geroprotectors: A role in the treatment of frailty. Mech Ageing Dev 2019; 180:11-20. [DOI: 10.1016/j.mad.2019.03.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Revised: 03/12/2019] [Accepted: 03/14/2019] [Indexed: 12/25/2022]
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208
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Mitchell SJ, Mitchell GJ, Mitchell JR. Modulation of frailty syndrome by diet: A review of evidence from mouse studies. Mech Ageing Dev 2019; 180:82-88. [DOI: 10.1016/j.mad.2019.04.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 04/04/2019] [Accepted: 04/09/2019] [Indexed: 10/27/2022]
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209
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Fielder E, Weigand M, Agneessens J, Griffin B, Parker C, Miwa S, von Zglinicki T. Sublethal whole-body irradiation causes progressive premature frailty in mice. Mech Ageing Dev 2019; 180:63-69. [PMID: 30954485 PMCID: PMC6546927 DOI: 10.1016/j.mad.2019.03.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 03/07/2019] [Accepted: 03/26/2019] [Indexed: 12/24/2022]
Abstract
There is an unmet need to develop and validate therapies that can treat or at least prevent premature therapy-induced frailty, multi-morbidity and mortality in long-term tumour survivors. In an approach to develop a first mouse model for therapy-induced long-term frailty, we irradiated male C57Bl/6 mice at 5-6 months of age sub-lethally with 3 × 3 Gy (whole body) and assessed subsequent frailty for up to 6 months using a Rockwood-type frailty index (FI). Frailty scorers were trained to obtain excellent inter- and intra-observer reproducibility. Irradiated mice developed progressive frailty approximately twice as fast as controls. This was premature frailty; it was phenotypically identical to that in non-irradiated mice at higher age. As expected, frailty was associated with decreased cognition and predicted mortality. In irradiated mice, frailty and neuromuscular performance, measured by Rotarod and Hanging Wire tests, were not associated with each other, probably because of long-term decreased body weights after irradiation. We conclude that progressive frailty following sub-lethal irradiation comprises a sensitive and easy to use test bed for interventions to stop premature ageing in long-term tumour survivors.
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Affiliation(s)
- Edward Fielder
- Newcastle University Institute for Ageing and Institute for Cell and Molecular Biology, Campus for Ageing and Vitality, Newcastle University, Newcastle Upon Tyne, NE4 5PL, UK
| | - Melanie Weigand
- Newcastle University Institute for Ageing and Institute for Cell and Molecular Biology, Campus for Ageing and Vitality, Newcastle University, Newcastle Upon Tyne, NE4 5PL, UK
| | - Julien Agneessens
- Newcastle University Institute for Ageing and Institute for Cell and Molecular Biology, Campus for Ageing and Vitality, Newcastle University, Newcastle Upon Tyne, NE4 5PL, UK
| | - Brigid Griffin
- Newcastle University Institute for Ageing and Institute for Cell and Molecular Biology, Campus for Ageing and Vitality, Newcastle University, Newcastle Upon Tyne, NE4 5PL, UK
| | - Craig Parker
- NIHR Newcastle Biomedical Research Centre, Institute of Neurosciences, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, NE4 5PL, UK
| | - Satomi Miwa
- Newcastle University Institute for Ageing and Institute for Cell and Molecular Biology, Campus for Ageing and Vitality, Newcastle University, Newcastle Upon Tyne, NE4 5PL, UK
| | - Thomas von Zglinicki
- Newcastle University Institute for Ageing and Institute for Cell and Molecular Biology, Campus for Ageing and Vitality, Newcastle University, Newcastle Upon Tyne, NE4 5PL, UK.
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210
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Seldeen KL, Redae YZ, Thiyagarajan R, Berman RN, Leiker MM, Troen BR. High intensity interval training improves physical performance in aged female mice: A comparison of mouse frailty assessment tools. Mech Ageing Dev 2019; 180:49-62. [PMID: 30951786 PMCID: PMC9841971 DOI: 10.1016/j.mad.2019.04.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 03/22/2019] [Accepted: 04/01/2019] [Indexed: 01/19/2023]
Abstract
Frailty syndrome increases the risk for disability and mortality, and is a major health concern amidst the geriatric shift in the population. High intensity interval training (HIIT), which couples bursts of vigorous activity interspersed with active recovery intervals, shows promise for the treatment of frailty. Here we compare and contrast five Fried physical phenotype and one deficit accumulation based mouse frailty assessment tools for identifying the impacts of HIIT on frailty and predicting functional capacity, underlying pathology, and survival in aged female mice. Our data reveal a 10-minute HIIT regimen administered 3-days-a-week for 8-weeks increased treadmill endurance, gait speed and maintained grip strength. One frailty tool identified a benefit of HIIT for frailty, but many were trending suggesting HIIT was beneficial for physical performance in these mice, but the 8-week timeframe may have been insufficient to induce frailty benefits. Finally, most frailty tools distinguished between surviving or non-surviving mice, whereas half correlated with functional capacity measured by nest building ability, and none correlated with underlying pathology. In summary, this study supports the ongoing development of mouse assessment tools as useful instruments for frailty research.
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Affiliation(s)
- Kenneth Ladd Seldeen
- Corresponding author at: 875 Ellicott Street, CTRC Room 8030A, Buffalo, NY 14203, USA. (K.L. Seldeen)
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211
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Pinheiro WO, Fascineli ML, Farias GR, Horst FH, de Andrade LR, Corrêa LH, Magalhães KG, Sousa MH, de Almeida MC, Azevedo RB, Lacava ZGM. The influence of female mice age on biodistribution and biocompatibility of citrate-coated magnetic nanoparticles. Int J Nanomedicine 2019; 14:3375-3388. [PMID: 31123402 PMCID: PMC6511116 DOI: 10.2147/ijn.s197888] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Magnetic nanoparticles (MNPs) have been successfully tested for several purposes in medical applications. However, knowledge concerning the effects of nanostructures on elderly organisms is remarkably scarce. PURPOSE To fill part of this gap, this work aimed to investigate biocompatibility and bio-distribution aspects of magnetic nanoparticles coated with citrate (NpCit) in both elderly and young healthy mice. METHODS NpCit (2.4 mg iron) was administered intraperitoneally, and its toxicity was evaluated for 28 days through clinical, biochemical, hematological, and histopathological examinations. In addition, its biodistribution was evaluated by spectrometric (inductively coupled plasma optical emission spectrometry) and histological methods. RESULTS NpCit presented age-dependent effects, inducing very slight and temporary biochemical and hematological changes in young animals. These changes were even weaker than the effects of the aging process, especially those related to the hematological data, tumor necrosis factor alpha, and nitric oxide levels. On the other hand, NpCit showed a distinct set of results in the elderly group, sometimes reinforcing (decrease of lymphocytes and increase of monocytes) and sometimes opposing (erythrocyte parameters and cytokine levels) the aging changes. Leukocyte changes were still observed on the 28th day after treatment in the elderly group. Slight evidence of a decrease in liver and immune functions was detected in elderly mice treated or not treated with NpCit. It was noted that tissue damage or clinical changes related to aging or to the NpCit treatment were not observed. As detected for aging, the pattern of iron biodistribution was significantly different after NpCit administration: extra iron was detected until the 28th day, but in different organs of elderly (liver and kidneys) and young (spleen, liver, and lungs) mice. CONCLUSION Taken together, the data show NpCit to be a stable and reasonably biocompatible sample, especially for young mice, and thus appropriate for biomedical applications. The data showed important differences after NpCit treatment related to the animals' age, and this emphasizes the need for further studies in older animals to appropriately extend the benefits of nanotechnology to the elderly population.
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Affiliation(s)
- Willie O Pinheiro
- Department of Genetics and Morphology, Institute of Biological Sciences, CNANO, University of Brasilia, Brasilia, DF 70910-900, Brazil,
- Post-graduation Program in Molecular Pathology, Faculty of Medicine, University of Brasilia, Brasília, DF 70910-900, Brazil,
| | - Maria L Fascineli
- Department of Genetics and Morphology, Institute of Biological Sciences, CNANO, University of Brasilia, Brasilia, DF 70910-900, Brazil,
| | - Gabriel R Farias
- Department of Genetics and Morphology, Institute of Biological Sciences, CNANO, University of Brasilia, Brasilia, DF 70910-900, Brazil,
| | - Frederico H Horst
- Department of Genetics and Morphology, Institute of Biological Sciences, CNANO, University of Brasilia, Brasilia, DF 70910-900, Brazil,
| | - Laise Rodrigues de Andrade
- Department of Genetics and Morphology, Institute of Biological Sciences, CNANO, University of Brasilia, Brasilia, DF 70910-900, Brazil,
| | - Luis Henrique Corrêa
- Laboratory of Immunology and Inflammation, Department of Cell Biology, University of Brasilia, Brasilia, DF 70910-900, Brazil
| | - Kelly Grace Magalhães
- Laboratory of Immunology and Inflammation, Department of Cell Biology, University of Brasilia, Brasilia, DF 70910-900, Brazil
| | - Marcelo Henrique Sousa
- Green Nanotechnology Group, Faculty of Ceilandia, University of Brasilia, Brasília, DF 72220-900, Brazil
| | - Marcos C de Almeida
- Department of Genetics and Morphology, Institute of Biological Sciences, CNANO, University of Brasilia, Brasilia, DF 70910-900, Brazil,
| | - Ricardo B Azevedo
- Department of Genetics and Morphology, Institute of Biological Sciences, CNANO, University of Brasilia, Brasilia, DF 70910-900, Brazil,
| | - Zulmira G M Lacava
- Department of Genetics and Morphology, Institute of Biological Sciences, CNANO, University of Brasilia, Brasilia, DF 70910-900, Brazil,
- Post-graduation Program in Molecular Pathology, Faculty of Medicine, University of Brasilia, Brasília, DF 70910-900, Brazil,
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212
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Older HIV-infected adults: complex patients- geriatric syndromes (II). Eur Geriatr Med 2019; 10:213-218. [PMID: 34652755 DOI: 10.1007/s41999-019-00160-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Accepted: 01/04/2019] [Indexed: 12/19/2022]
Abstract
With the widespread adoption of highly active antiretroviral therapy (HAART), HIV infection starts to be considered one of the many chronic illnesses of advanced age. A growing proportion of the affected patients is presently older than 50. It has been suggested that HIV infection may today represent a model of accelerated and accentuated ageing. The need for a closer collaboration between geriatricians and HIV physicians is being growingly recognised to better address the priorities and needs of HIV patients. The final aim behind the generation of such synergies resides in the design of personalised plans of interventions. These plans should stem from the results of a comprehensive assessment of the individual spanning clinical, environmental, and psychosocial domains. Through the early identification of stressors and risk factors potentially disrupting the homeostatic balance of frail patients (including those living with HIV), it might be possible to protect the "biologically old" (but not necessarily "chronologically old") HIV-infected people from developing detrimental geriatric syndromes. In this article, specific features making the ageing HIV population of special interest for geriatric medicine, and the importance of a multidisciplinary model of care are described. The final objective is to stress how the only way for adequately tackling the multifaceted frailty condition of people with HIV is to implement novel models of care based on the comprehensive geriatric assessment.
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213
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Ratto D, Corana F, Mannucci B, Priori EC, Cobelli F, Roda E, Ferrari B, Occhinegro A, Di Iorio C, De Luca F, Cesaroni V, Girometta C, Bottone MG, Savino E, Kawagishi H, Rossi P. Hericium erinaceus Improves Recognition Memory and Induces Hippocampal and Cerebellar Neurogenesis in Frail Mice during Aging. Nutrients 2019; 11:E715. [PMID: 30934760 PMCID: PMC6521003 DOI: 10.3390/nu11040715] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 03/19/2019] [Accepted: 03/25/2019] [Indexed: 12/27/2022] Open
Abstract
Frailty is a geriatric syndrome associated with both locomotor and cognitive decline, implicated in both poor quality of life and negative health outcomes. One central question surrounding frailty is whether phenotypic frailty is associated with the cognitive impairment during aging. Using spontaneous behavioral tests and by studying the dynamic change during aging, we demonstrated that the two form of vulnerability, locomotor and recognition memory decline, develop in parallel and therefore, integration of the motoric and cognitive evaluations are imperative. We developed an integrated frailty index based on both phenotypic and recognition memory performances. Hericium erinaceus (H. erinaceus) is a medicinal mushroom that improves recognition memory in mice. By using HPLC-UV-ESI/MS analyses we obtained standardized amounts of erinacine A and hericenones C and D in H. erinaceus extracts, that were tested in our animal model of physiological aging. Two-month oral supplementation with H. erinaceus reversed the age-decline of recognition memory. Proliferating cell nuclear antigen (PCNA) and doublecortin (DCX) immunohistochemistry in the hippocampus and cerebellum in treated mice supported a positive effect of an H. erinaceus on neurogenesis in frail mice.
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Affiliation(s)
- Daniela Ratto
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
| | - Federica Corana
- Centro Grandi Strumenti, University of Pavia, 27100 Pavia, Italy.
| | - Barbara Mannucci
- Centro Grandi Strumenti, University of Pavia, 27100 Pavia, Italy.
| | - Erica Cecilia Priori
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
| | - Filippo Cobelli
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
| | - Elisa Roda
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
- Laboratory of Clinical & Experimental Toxicology, Pavia Poison Centre, National Toxicology Information Centre, Toxicology Unit, ICS Maugeri SpA, IRCCS Pavia, 27100 Pavia, Italy.
| | - Beatrice Ferrari
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
| | - Alessandra Occhinegro
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
| | - Carmine Di Iorio
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
| | - Fabrizio De Luca
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
| | - Valentina Cesaroni
- Department of Earth and Environmental Sciences, University of Pavia, 27100 Pavia, Italy.
| | - Carolina Girometta
- Department of Earth and Environmental Sciences, University of Pavia, 27100 Pavia, Italy.
| | - Maria Grazia Bottone
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
| | - Elena Savino
- Department of Earth and Environmental Sciences, University of Pavia, 27100 Pavia, Italy.
| | - Hirokazu Kawagishi
- Research Institute of Green Science and Technology, Shizuoka University, Shizuoka 422-8529, Japan.
| | - Paola Rossi
- Department of Biology and Biotechnology "L. Spallanzani", University of Pavia, 27100 Pavia, Italy.
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214
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Singh PP, Demmitt BA, Nath RD, Brunet A. The Genetics of Aging: A Vertebrate Perspective. Cell 2019; 177:200-220. [PMID: 30901541 PMCID: PMC7592626 DOI: 10.1016/j.cell.2019.02.038] [Citation(s) in RCA: 145] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 02/21/2019] [Accepted: 02/22/2019] [Indexed: 02/07/2023]
Abstract
Aging negatively impacts vitality and health. Many genetic pathways that regulate aging were discovered in invertebrates. However, the genetics of aging is more complex in vertebrates because of their specialized systems. This Review discusses advances in the genetic regulation of aging in vertebrates from work in mice, humans, and organisms with exceptional lifespans. We highlight challenges for the future, including sex-dependent differences in lifespan and the interplay between genes and environment. We also discuss how the identification of reliable biomarkers of age and development of new vertebrate models can be leveraged for personalized interventions to counter aging and age-related diseases.
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Affiliation(s)
- Param Priya Singh
- Department of Genetics, Stanford University, Stanford, CA 94305, USA
| | | | - Ravi D Nath
- Department of Genetics, Stanford University, Stanford, CA 94305, USA
| | - Anne Brunet
- Department of Genetics, Stanford University, Stanford, CA 94305, USA; Glenn Laboratories for the Biology of Aging, Stanford, CA 94305, USA.
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215
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Freund A. Untangling Aging Using Dynamic, Organism-Level Phenotypic Networks. Cell Syst 2019; 8:172-181. [PMID: 30878357 DOI: 10.1016/j.cels.2019.02.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 12/14/2018] [Accepted: 02/13/2019] [Indexed: 12/15/2022]
Abstract
Research on aging requires the ability to measure aging, and therein lies a challenge: it is impossible to measure every molecular, cellular, and physiological change that develops over time, but it is difficult to prioritize phenotypes for measurement because it is unclear which biological changes should be considered aspects of aging and, further, which species and environments exhibit "real aging." Here, I propose a strategy to address this challenge: rather than classify phenotypes as "real aging" or not, conceptualize aging as the set of all age-dependent phenotypes and appreciate that this set and its underlying mechanisms may vary by population. Use automated phenotyping technologies to measure as many age-dependent phenotypes as possible within individuals over time, prioritizing organism-level (i.e., physiological) phenotypes in order to enrich for health relevance. Use those high-dimensional phenotypic data to construct dynamic networks that allow aging to be studied with unprecedented sophistication and rigor.
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Affiliation(s)
- Adam Freund
- Calico Life Sciences, LLC, South San Francisco, CA 94080, USA.
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216
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Yamada Y, Kemnitz JW, Weindruch R, Anderson RM, Schoeller DA, Colman RJ. Caloric Restriction and Healthy Life Span: Frail Phenotype of Nonhuman Primates in the Wisconsin National Primate Research Center Caloric Restriction Study. J Gerontol A Biol Sci Med Sci 2019; 73:273-278. [PMID: 28398464 DOI: 10.1093/gerona/glx059] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 03/21/2017] [Indexed: 01/23/2023] Open
Abstract
Calorie restriction without malnutrition increases longevity and delays the onset of age-associated disorders in multiple species. Recently, greater emphasis has been placed on healthy life span and preventing frailty than on longevity. Here, we show the beneficial effect of long-term calorie restriction on frailty in later life in a nonhuman primate. Frail phenotypes were evaluated using metabolic and physical activity data and defined using the Fried index. Shrinking was defined as unintentional weight loss of greater than 5% of body weight. Weakness was indicated by decline in high intensity spontaneous physical activity. Poor endurance or exhaustion was indicated by a reduction in energy efficiency of movements. Slowness was indicated by physical activity counts in the morning. Low physical activity level was measured by total energy expenditure using doubly labeled water divided by sleeping metabolic rate. Weakness, poor endurance, slowness, and low physical activity level were significantly higher in control compared with calorie restriction (p < .05) as was total incidence of frailty (p < .001). In conclusion, we established a novel set of measurable criteria of frailty in nonhuman primates, and using these criteria, showed that calorie restriction reduces the incidence of frailty and increases healthy life span in nonhuman primates.
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Affiliation(s)
- Yosuke Yamada
- Department of Nutritional Science, National Institutes of Biomedical Health, Innovation, and Nutrition, Tokyo, Japan
| | - Joseph W Kemnitz
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison.,Wisconsin National Primate Research Center, Madison
| | | | - Rozalyn M Anderson
- Department of Medicine, University of Wisconsin-Madison.,GRECC, William S Middleton Memorial Veterans Hospital, Madison, Wisconsin
| | | | - Ricki J Colman
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison.,Wisconsin National Primate Research Center, Madison
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Bisset ES, Howlett SE. The biology of frailty in humans and animals: Understanding frailty and promoting translation. Aging Med (Milton) 2019; 2:27-34. [PMID: 31942510 PMCID: PMC6880675 DOI: 10.1002/agm2.12058] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 02/28/2019] [Indexed: 12/14/2022] Open
Abstract
Frailty is a state of high vulnerability to adverse health outcomes. This concept is used to explain the heterogeneity in rates of aging in people of the same age. Frailty has important clinical implications, because even minor stressors can lead to adverse outcomes, including death, in frail individuals. Although frailty mechanisms are not well understood, advances in our ability to qualify frailty have encouraged efforts in this area. Quantification of frailty with both "frailty phenotype" and "frailty index" approaches has begun to highlight putative frailty mechanisms and new animal models of frailty are inspiring preclinical research. These models either adapt frailty phenotype and frailty index tools for use in animals or they use genetically manipulated mice that mimic conditions seen in frailty (eg, inflammation, sarcopenia, weakness). This review: describes commonly used tools to quantify frailty clinically, discusses potential frailty mechanisms, and describes animal models of frailty. It also highlights how these models have been used to explore frailty mechanisms and potential frailty interventions, including pharmacological treatments, diet, and exercise. These exciting new developments in the field have the potential to facilitate translational research, improve our understanding of mechanisms of frailty, and help develop new interventions to mitigate frailty in our aging population.
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Affiliation(s)
- Elise S. Bisset
- Department of PharmacologyDalhousie UniversityHalifaxNova ScotiaCanada
| | - Susan E. Howlett
- Department of PharmacologyDalhousie UniversityHalifaxNova ScotiaCanada
- Department of Medicine (Geriatric Medicine)Dalhousie UniversityHalifaxNova ScotiaCanada
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218
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Blodgett JM, Theou O, Mitnitski A, Howlett SE, Rockwood K. Associations between a laboratory frailty index and adverse health outcomes across age and sex. Aging Med (Milton) 2019; 2:11-17. [PMID: 31942508 PMCID: PMC6880698 DOI: 10.1002/agm2.12055] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 02/18/2019] [Accepted: 02/18/2019] [Indexed: 12/18/2022] Open
Abstract
OBJECTIVE Early frailty may be captured by a frailty index (FI) based entirely on vital signs and laboratory tests. Our aim was to examine associations between a laboratory-based FI (FI-Lab) and adverse health outcomes, and investigate how this changed with age. METHODS Up to 8988 individuals aged 20+ years from the 2003-2004 and 2005-2006 National Health and Nutrition Examination Survey cohorts were included. Characteristics of the FI-Lab were compared to those of a self-reported clinical FI. Associations between each FI and health care use, self-reported health, and disability were examined in the full sample and across age groups. RESULTS Laboratory-based FI scores increased with age but did not demonstrate expected sex differences. Women aged 20-39 years had higher FI scores than men; this pattern reversed after age 60 years. FI-Lab scores were associated with poor self-reported health (odds ratio[95% confidence interval]: 1.46[1.39-1.54]), high health care use (1.35[1.29-1.42]), and high disability (1.41[1.32-1.50]), even among those aged 20-39 years. CONCLUSION Higher FI-Lab scores were associated with poor health outcomes at all ages. Associations in the youngest group support the notion that deficit accumulation occurs across the lifespan. FI-Lab scores could be utilized as an early screening tool to identify deficit accumulation at the cellular and molecular level before they become clinically visible.
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Affiliation(s)
| | - Olga Theou
- Geriatric MedicineDepartment of MedicineDalhousie UniversityHalifaxNova ScotiaCanada
| | - Arnold Mitnitski
- Geriatric MedicineDepartment of MedicineDalhousie UniversityHalifaxNova ScotiaCanada
| | - Susan E. Howlett
- Geriatric MedicineDepartment of MedicineDalhousie UniversityHalifaxNova ScotiaCanada
- Department of PharmacologyDalhousie UniversityHalifaxNova ScotiaCanada
| | - Kenneth Rockwood
- Geriatric MedicineDepartment of MedicineDalhousie UniversityHalifaxNova ScotiaCanada
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219
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Correia-Melo C, Birch J, Fielder E, Rahmatika D, Taylor J, Chapman J, Lagnado A, Carroll BM, Miwa S, Richardson G, Jurk D, Oakley F, Mann J, Mann DA, Korolchuk VI, Passos JF. Rapamycin improves healthspan but not inflammaging in nfκb1 -/- mice. Aging Cell 2019; 18:e12882. [PMID: 30468013 PMCID: PMC6351839 DOI: 10.1111/acel.12882] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/15/2018] [Accepted: 11/01/2018] [Indexed: 12/22/2022] Open
Abstract
Increased activation of the major pro‐inflammatory NF‐κB pathway leads to numerous age‐related diseases, including chronic liver disease (CLD). Rapamycin, an inhibitor of mTOR, extends lifespan and healthspan, potentially via suppression of inflammaging, a process which is partially dependent on NF‐κB signalling. However, it is unknown if rapamycin has beneficial effects in the context of compromised NF‐κB signalling, such as that which occurs in several age‐related chronic diseases. In this study, we investigated whether rapamycin could ameliorate age‐associated phenotypes in a mouse model of genetically enhanced NF‐κB activity (nfκb1−/−) characterized by low‐grade chronic inflammation, accelerated aging and CLD. We found that, despite showing no beneficial effects in lifespan and inflammaging, rapamycin reduced frailty and improved long‐term memory, neuromuscular coordination and tissue architecture. Importantly, markers of cellular senescence, a known driver of age‐related pathology, were alleviated in rapamycin‐fed animals. Our results indicate that, in conditions of genetically enhanced NF‐κB, rapamycin delays aging phenotypes and improves healthspan uncoupled from its role as a suppressor of inflammation.
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Affiliation(s)
- Clara Correia-Melo
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
| | - Jodie Birch
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
| | - Edward Fielder
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
| | - Dina Rahmatika
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
| | - Jennifer Taylor
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
| | - James Chapman
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
| | - Anthony Lagnado
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
- Department of Physiology and Biomedical Engineering; Mayo Clinic; Rochester Minnesota
| | - Bernadette M. Carroll
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
| | - Satomi Miwa
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
| | - Gavin Richardson
- Cardiovascular Research Centre, Institute of Genetic Medicine, International Centre for Life; Newcastle University; Newcastle upon Tyne UK
| | - Diana Jurk
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
- Department of Physiology and Biomedical Engineering; Mayo Clinic; Rochester Minnesota
| | - Fiona Oakley
- Faculty of Medical Sciences, Institute of Cellular Medicine; Newcastle University; Newcastle upon Tyne UK
| | - Jelena Mann
- Faculty of Medical Sciences, Institute of Cellular Medicine; Newcastle University; Newcastle upon Tyne UK
| | - Derek A. Mann
- Faculty of Medical Sciences, Institute of Cellular Medicine; Newcastle University; Newcastle upon Tyne UK
| | - Viktor I. Korolchuk
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
| | - João F. Passos
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biosciences; Newcastle University; Newcastle upon Tyne UK
- Department of Physiology and Biomedical Engineering; Mayo Clinic; Rochester Minnesota
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220
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Banga S, Heinze-Milne SD, Howlett SE. Rodent models of frailty and their application in preclinical research. Mech Ageing Dev 2019; 179:1-10. [PMID: 30703384 DOI: 10.1016/j.mad.2019.01.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 01/25/2019] [Indexed: 12/21/2022]
Abstract
In clinical medicine, the concept of frailty is viewed as a state of high vulnerability to adverse health outcomes in people of the same age. Frailty is an important challenge because the loss of physiological reserve means that even minor stressors can lead to disability and death in those who are frail. Even so, the biology of frailty is not well understood. Rodent models of frailty are stimulating research into the biology of frailty. These pre-clinical models are based on "reverse-translation". Investigators have adapted either the "frailty phenotype" approach or the "frailty index" approach, originally developed in humans, for use in animals. This review briefly describes rodent models of frailty, discusses how these models have been used to explore mechanisms of frailty and how they have been employed to assess the impact of frailty on various experimental outcomes. The review also highlights studies that have used rodent models to investigate interventions to attenuate frailty, including drug treatment, dietary modifications and exercise. The ability to model frailty in animals is an exciting development that promises to accelerate the translation of laboratory discoveries into new clinical interventions, and situates frailty research in the larger context of geroscience.
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Affiliation(s)
- Shubham Banga
- Department of Pharmacology, Dalhousie University, Halifax, NS, Canada.
| | | | - Susan E Howlett
- Department of Pharmacology, Dalhousie University, Halifax, NS, Canada; Department of Medicine (Geriatric Medicine), Dalhousie University, Halifax, NS, Canada.
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Huang DD, Fan SD, Chen XY, Yan XL, Zhang XZ, Ma BW, Yu DY, Xiao WY, Zhuang CL, Yu Z. Nrf2 deficiency exacerbates frailty and sarcopenia by impairing skeletal muscle mitochondrial biogenesis and dynamics in an age-dependent manner. Exp Gerontol 2019; 119:61-73. [PMID: 30690066 DOI: 10.1016/j.exger.2019.01.022] [Citation(s) in RCA: 99] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 01/12/2019] [Accepted: 01/22/2019] [Indexed: 01/18/2023]
Abstract
AIM Mitochondrial dysfunction during aging is a key factor that contributes to sarcopenia. Nuclear factor erythroid 2-related factor 2 (Nrf2) has been increasingly recognized to regulate mitochondrial function. The present study aimed to investigate the role of Nrf2 in the development of frailty and sarcopenia during aging, and to demonstrate whether Nrf2 contributes to the maintenance of muscle mass and function by regulation of mitochondrial biogenesis and dynamics during the aging process. METHODS Young (5-6 months), middle-aged (11-13 months), old (20-24 months) Nrf2-/- (knockout, KO) mice and age-matched wild-type (WT) C57/BL6 mice were used in this study. Physical function of the mice in the 6 groups was assessed by grip strength test, four paw inverted hanging test, rotarod analysis, open field analysis, and treadmill endurance test. Muscle mass was measured by cross-sectional area (CSA) of tibialis anterior muscles and gastrocnemius muscle weight. The frailty status of the 25 old WT mice and 23 old KO mice were assessed based on the mouse frailty phenotype assessment. Expression levels of genes involved in mitochondrial biogenesis (nuclear respiratory factor 1 (Nrf1), peroxisome proliferative activated receptor, gamma, coactivator 1 alpha (PGC-1α), mitochondrial transcription factor A (TFAM)) and mitochondrial dynamics (optic atrophy protein 1 (Opa1), mitofusin 1 (Mfn1), mitofusin 2 (Mfn2), and dynamin-related protein 1 (Drp1)) were measured in the skeletal muscle. SDH staining was performed and mitochondrial DNA (mtDNA) copy number was measured. Transmission electron microscopy was used to measure the mitochondria number and morphology. RESULTS Physical function and muscle mass decreased during aging. The mRNA expression levels of Nrf2 decreased with increasing frailty phenotype scores in the old WT mice. There were minimal differences in the physical function and muscle mass between the WT and KO mice in the young groups, whereas Nrf2 deficiency caused a declined physical function and muscle mass in the middle-aged and old mice, and exacerbated frailty in the old mice. The decreases of the physical function and muscle mass were accompanied by the reduced expression levels of genes involved in mitochondrial biogenesis and dynamics, as well as a reduction of mitochondrial number, mitochondrial content, mtDNA copy number, and an impaired mitochondria morphology in the skeletal muscle. CONCLUSION Nrf2 deficiency exacerbated frailty and sarcopenia during aging, at least partially by impairing skeletal muscle mitochondrial biogenesis and dynamics in an age-dependent manner.
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Affiliation(s)
- Dong-Dong Huang
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Sheng-Dong Fan
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Xi-Yi Chen
- Department of Gastrointestinal Surgery, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, China
| | - Xia-Lin Yan
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Xian-Zhong Zhang
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Bing-Wei Ma
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Ding-Ye Yu
- Department of General Surgery, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Wen-Yu Xiao
- Shanghai Tenth People's Hospital Chongming Branch Affiliated to Tongji University, Shanghai, China
| | - Cheng-Le Zhuang
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China.
| | - Zhen Yu
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China; Shanghai Tenth People's Hospital Chongming Branch Affiliated to Tongji University, Shanghai, China.
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Abstract
The types of changes in physical appearance and behavior that occur in elderly people similarly develop in elderly animals. Signs and symptoms that might cause concern in younger people or mice may be normal in their elderly but generally healthy counterparts. Although numerous scoring methods have been developed to assess rodent health, these systems were often designed for young adults used in specific types of research, such as cancer or neurologic studies, and therefore may be suboptimal for assessing aging rodents. Approaches known as frailty assessments provide a global evaluation of the health of aged mice, rats, and people, and mouse frailty scores correlate well with the likelihood of death. Complementing frailty assessment, prediction of imminent death in aged mice can often be accomplished by focusing on 2 objective parameters-body weight and temperature. Before they die, many (but not all) mice develop marked reductions in body weight and temperature, thus providing signs that close monitoring, intervention, or preemptive euthanasia may be necessary. Timely preemptive euthanasia allows antemortem collection of data and samples that would be lost if spontaneous death occurred; preemptive euthanasia also limits terminal suffering. These approaches to monitoring declining health and predicting death in elderly research mice can aid in establishing and implementing timely interventions that both benefit the research and reduce antemortem suffering.
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Affiliation(s)
- Linda A Toth
- Emeritus Faculty, Southern Illinois University School of Medicine, Springfield, Illinois, USA.
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223
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Rockwood K, Howlett SE. Fifteen years of progress in understanding frailty and health in aging. BMC Med 2018; 16:220. [PMID: 30477486 PMCID: PMC6258409 DOI: 10.1186/s12916-018-1223-3] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 11/19/2018] [Indexed: 02/26/2023] Open
Abstract
The notion of frailty has evolved for more than 15 years. Although there is no consensus definition, frailty reflects a state of increased vulnerability to adverse health outcomes for individuals of the same chronological age. Two commonly used clinical tools, the frailty index and the frailty phenotype, both measure health-related deficits. The frailty index is a ratio of the number of deficits that an individual has accumulated divided by all deficits measured, whereas the phenotype specifies frailty as represented by poor performance in three of five criteria (i.e., weight loss, exhaustion, weakness, slowness, lack of activity). From human studies, animal models of both approaches have been developed and are beginning to shed light on mechanisms underlying frailty, the influence of frailty on disease expression, and new interventions to attenuate frailty. Currently, back-translation to humans is occurring. As we start to understand subcellular mechanisms involved in damage and repair as well as their response to treatment, we will begin to understand the molecular basis of aging and, thus, of frailty.
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Affiliation(s)
- Kenneth Rockwood
- Geriatric Medicine, Department of Medicine, Dalhousie University, Halifax, NS, Canada.
| | - Susan E Howlett
- Geriatric Medicine, Department of Medicine, Dalhousie University, Halifax, NS, Canada.,Department of Pharmacology, Dalhousie University, Halifax, NS, Canada
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224
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Matsunami K. Frailty and Caenorhabditis elegans as a Benchtop Animal Model for Screening Drugs Including Natural Herbs. Front Nutr 2018; 5:111. [PMID: 30534551 PMCID: PMC6275236 DOI: 10.3389/fnut.2018.00111] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Accepted: 11/06/2018] [Indexed: 01/14/2023] Open
Abstract
Caenorhabditis elegans has been used in research for years to clarify the genetic cascades and molecular mechanisms of aging, longevity, and health span. Health span is closely related to frailty; however, frailty has a different concept and is evaluated using various parameters in humans, such as Fried's Frailty Criteria. The C. elegans model has several advantages when performing a chemical screen to identify drug candidates. Several mouse models of frailty were recently developed, including a homozygous IL-10 knockout. These mouse models are useful for understanding human frailty; however, they are not appropriate for primary drug screening because they require large spaces, expensive cost, and time consuming assessments. Therefore, a combination of these models may be a promising tool for discovering drugs and understanding the mechanisms of frailty. In addition, natural products, and herbs are attractive sources of novel drugs with pharmacological activity and low toxicity, in fact, over 60% of currently-available drugs are estimated to be related to natural compounds. In this review, the possibility of identifying natural agents (i.e., herb extracts and compounds) that could improve frailty are proposed, and the advantages and limitations of these models are also discussed.
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Affiliation(s)
- Katsuyoshi Matsunami
- Department of Pharmacognosy, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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225
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Woulfe KC, Bruns DR. From pediatrics to geriatrics: Mechanisms of heart failure across the life-course. J Mol Cell Cardiol 2018; 126:70-76. [PMID: 30458169 DOI: 10.1016/j.yjmcc.2018.11.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 10/29/2018] [Accepted: 11/14/2018] [Indexed: 01/08/2023]
Abstract
Heart failure (HF) is a significant public health problem and a disease with high 5-year mortality. Although age is the primary risk factor for development of HF, it is a disease which impacts patients of all ages. Historically, HF has been studied as a one-size fits all strategy- with the majority of both clinical and basic science investigations employing adult male subjects or adult male pre-clinical animal models. We postulate that inclusion of biological variables in HF studies is necessary to improve our understanding of mechanisms of HF and improve outcomes. In this review, we will discuss age-specific differences in HF patients, particularly focusing on the pediatric and geriatric age groups. In addition, we will also discuss the biological variable of sex. Characterizing and understanding the mechanistic differences in these distinct HF populations can provide insights that will benefit and personalize therapeutic interventions. Further, we propose that future investigations into the cellular mechanisms involved in the developing and juvenile heart may provide valuable insights for targets that would be beneficial in aging patients.
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Affiliation(s)
- Kathleen C Woulfe
- University of Colorado-Denver; Department of Medicine, Division of Cardiology, 12700 E 19th Ave Aurora, CO, USA.
| | - Danielle R Bruns
- University of Wyoming, Division of Kinesiology & Health, Laramie, WY, USA
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226
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Cardoso AL, Fernandes A, Aguilar-Pimentel JA, de Angelis MH, Guedes JR, Brito MA, Ortolano S, Pani G, Athanasopoulou S, Gonos ES, Schosserer M, Grillari J, Peterson P, Tuna BG, Dogan S, Meyer A, van Os R, Trendelenburg AU. Towards frailty biomarkers: Candidates from genes and pathways regulated in aging and age-related diseases. Ageing Res Rev 2018; 47:214-277. [PMID: 30071357 DOI: 10.1016/j.arr.2018.07.004] [Citation(s) in RCA: 281] [Impact Index Per Article: 46.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 07/08/2018] [Accepted: 07/10/2018] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Use of the frailty index to measure an accumulation of deficits has been proven a valuable method for identifying elderly people at risk for increased vulnerability, disease, injury, and mortality. However, complementary molecular frailty biomarkers or ideally biomarker panels have not yet been identified. We conducted a systematic search to identify biomarker candidates for a frailty biomarker panel. METHODS Gene expression databases were searched (http://genomics.senescence.info/genes including GenAge, AnAge, LongevityMap, CellAge, DrugAge, Digital Aging Atlas) to identify genes regulated in aging, longevity, and age-related diseases with a focus on secreted factors or molecules detectable in body fluids as potential frailty biomarkers. Factors broadly expressed, related to several "hallmark of aging" pathways as well as used or predicted as biomarkers in other disease settings, particularly age-related pathologies, were identified. This set of biomarkers was further expanded according to the expertise and experience of the authors. In the next step, biomarkers were assigned to six "hallmark of aging" pathways, namely (1) inflammation, (2) mitochondria and apoptosis, (3) calcium homeostasis, (4) fibrosis, (5) NMJ (neuromuscular junction) and neurons, (6) cytoskeleton and hormones, or (7) other principles and an extensive literature search was performed for each candidate to explore their potential and priority as frailty biomarkers. RESULTS A total of 44 markers were evaluated in the seven categories listed above, and 19 were awarded a high priority score, 22 identified as medium priority and three were low priority. In each category high and medium priority markers were identified. CONCLUSION Biomarker panels for frailty would be of high value and better than single markers. Based on our search we would propose a core panel of frailty biomarkers consisting of (1) CXCL10 (C-X-C motif chemokine ligand 10), IL-6 (interleukin 6), CX3CL1 (C-X3-C motif chemokine ligand 1), (2) GDF15 (growth differentiation factor 15), FNDC5 (fibronectin type III domain containing 5), vimentin (VIM), (3) regucalcin (RGN/SMP30), calreticulin, (4) PLAU (plasminogen activator, urokinase), AGT (angiotensinogen), (5) BDNF (brain derived neurotrophic factor), progranulin (PGRN), (6) α-klotho (KL), FGF23 (fibroblast growth factor 23), FGF21, leptin (LEP), (7) miRNA (micro Ribonucleic acid) panel (to be further defined), AHCY (adenosylhomocysteinase) and KRT18 (keratin 18). An expanded panel would also include (1) pentraxin (PTX3), sVCAM/ICAM (soluble vascular cell adhesion molecule 1/Intercellular adhesion molecule 1), defensin α, (2) APP (amyloid beta precursor protein), LDH (lactate dehydrogenase), (3) S100B (S100 calcium binding protein B), (4) TGFβ (transforming growth factor beta), PAI-1 (plasminogen activator inhibitor 1), TGM2 (transglutaminase 2), (5) sRAGE (soluble receptor for advanced glycosylation end products), HMGB1 (high mobility group box 1), C3/C1Q (complement factor 3/1Q), ST2 (Interleukin 1 receptor like 1), agrin (AGRN), (6) IGF-1 (insulin-like growth factor 1), resistin (RETN), adiponectin (ADIPOQ), ghrelin (GHRL), growth hormone (GH), (7) microparticle panel (to be further defined), GpnmB (glycoprotein nonmetastatic melanoma protein B) and lactoferrin (LTF). We believe that these predicted panels need to be experimentally explored in animal models and frail cohorts in order to ascertain their diagnostic, prognostic and therapeutic potential.
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Schosserer M, Banks G, Dogan S, Dungel P, Fernandes A, Marolt Presen D, Matheu A, Osuchowski M, Potter P, Sanfeliu C, Tuna BG, Varela-Nieto I, Bellantuono I. Modelling physical resilience in ageing mice. Mech Ageing Dev 2018; 177:91-102. [PMID: 30290161 PMCID: PMC6445352 DOI: 10.1016/j.mad.2018.10.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Revised: 09/12/2018] [Accepted: 10/01/2018] [Indexed: 02/06/2023]
Abstract
Geroprotectors, a class of drugs targeting multiple deficits occurring with age, necessitate the development of new animal models to test their efficacy. The COST Action MouseAGE is a European network whose aim is to reach consensus on the translational path required for geroprotectors, interventions targeting the biology of ageing. In our previous work we identified frailty and loss of resilience as a potential target for geroprotectors. Frailty is the result of an accumulation of deficits, which occurs with age and reduces the ability to respond to adverse events (physical resilience). Modelling frailty and physical resilience in mice is challenging for many reasons. There is no consensus on the precise definition of frailty and resilience in patients or on how best to measure it. This makes it difficult to evaluate available mouse models. In addition, the characterization of those models is poor. Here we review potential models of physical resilience, focusing on those where there is some evidence that the administration of acute stressors requires integrative responses involving multiple tissues and where aged mice showed a delayed recovery or a worse outcome then young mice in response to the stressor. These models include sepsis, trauma, drug- and radiation exposure, kidney and brain ischemia, exposure to noise, heat and cold shock.
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Affiliation(s)
- Markus Schosserer
- University of Natural Resources and Life Sciences, Vienna, Department of Biotechnology, Vienna, Austria
| | - Gareth Banks
- Mammalian Genetics Unit, MRC Harwell Institute, Harwell Campus, Oxfordshire, OX11 0RD, United Kingdom
| | - Soner Dogan
- Department of Medical Biology, School of Medicine, Yeditepe University, Istanbul, Turkey
| | - Peter Dungel
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Center, Vienna, Austria
| | - Adelaide Fernandes
- Neuron-Glia Biology in Health and Disease, iMed.ULisboa, Research Institute for Medicines, Department of Biochemistry and Human Biology, Faculty of Pharmacy, Universidade de Lisboa, Lisboa, Portugal
| | - Darja Marolt Presen
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Center, Vienna, Austria
| | - Ander Matheu
- Oncology Department, Biodonostia Research Institute, San Sebastián, Spain
| | - Marcin Osuchowski
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Center, Vienna, Austria
| | - Paul Potter
- Mammalian Genetics Unit, MRC Harwell Institute, Harwell Campus, Oxfordshire, OX11 0RD, United Kingdom
| | - Coral Sanfeliu
- Institute of Biomedical Research of Barcelona (IIBB) CSIC, IDIBAPS, CIBERESP, Barcelona, Spain
| | - Bilge Guvenc Tuna
- Department of Medical Biophysics, School of Medicine, Yeditepe University, Istanbul, Turkey
| | | | - Ilaria Bellantuono
- MRC/Arthritis Research-UK Centre for Integrated Research into Musculoskeletal Ageing (CIMA), Department of Oncology and Metabolism, The Medical School, Beech Hill Road, Sheffield, S10 2RX, United Kingdom.
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Nguyen TVV, Hayes M, Zbesko JC, Frye JB, Congrove NR, Belichenko NP, McKay BS, Longo FM, Doyle KP. Alzheimer's associated amyloid and tau deposition co-localizes with a homeostatic myelin repair pathway in two mouse models of post-stroke mixed dementia. Acta Neuropathol Commun 2018; 6:100. [PMID: 30249297 PMCID: PMC6154927 DOI: 10.1186/s40478-018-0603-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 09/19/2018] [Indexed: 11/23/2022] Open
Abstract
The goal of this study was to determine the chronic impact of stroke on the manifestation of Alzheimer’s disease (AD) related pathology and behavioral impairments in mice. To accomplish this goal, we used two distinct models. First, we experimentally induced ischemic stroke in aged wildtype (wt) C57BL/6 mice to determine if stroke leads to the manifestation of AD-associated pathological β-amyloid (Aβ) and tau in aged versus young adult wt mice. Second, we utilized a transgenic (Tg) mouse model of AD (hAPP-SL) to determine if stroke leads to the worsening of pre-existing AD pathology, as well as the development of pathology in brain regions not typically expressed in AD Tg mice. In the wt mice, there was delayed motor recovery and an accelerated development of cognitive deficits in aged mice compared to young adult mice following stroke. This corresponded with increased brain atrophy, increased cholinergic degeneration, and a focal increase of Aβ in areas of axonal degeneration in the ipsilateral hemisphere of the aged animals. By contrast, in the hAPP-SL mice, we found that ischemia induced aggravated behavioral deficits in conjunction with a global increase in Aβ, tau, and cholinergic pathology compared to hAPP-SL mice that underwent a sham stroke procedure. With regard to a potential mechanism, in both models, we found that the stroke-induced Aβ and tau deposits co-localized with increased levels of β-secretase 1 (BACE1), along with its substrate, neuregulin 1 (NGR1) type III, both of which are proteins integral for myelin repair. Based on these findings, we propose that the chronic sequelae of stroke may be ratcheting-up a myelin repair pathway, and that the consequent increase in BACE1 could be causing an inadvertent cleavage of its alternative substrate, AβPP, resulting in greater Aβ seeding and pathogenesis.
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Viña J, Borras C, Gomez-Cabrera MC. A free radical theory of frailty. Free Radic Biol Med 2018; 124:358-363. [PMID: 29958933 DOI: 10.1016/j.freeradbiomed.2018.06.028] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 06/21/2018] [Accepted: 06/25/2018] [Indexed: 12/18/2022]
Abstract
The free radical theory of ageing provided an intellectual framework for many laboratories working on ageing. However, experimental and clinical evidence showing that high doses of antioxidants do not have an effect on ageing or on age-associated diseases, cast doubts on the validity of this theory. Data from our own laboratory show that oxidative damage does not correlate with age, especially in the geriatric population, but rather with the frailty state. This has led us to postulate the free radical theory of frailty that proposes that oxidative damage is associated with frailty, but not with chronological age itself. Superoxide dismutase deficient mice are more frail than controls. But more importantly, we have observed that animals that are protected against oxidative damage by overexpression of antioxidant enzymes, delay the onset of frailty and are more vigorous than controls. In this review, we describe results from both, experimental animals and human cohorts, that lead us to the formulate this free radical theory of frailty.
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Affiliation(s)
- Jose Viña
- Freshage Research Group. Department of Physiology, Faculty of Medicine, University of Valencia, CIBERFES, INCLIVA, Avenida Blasco Ibañez, 15, Valencia, Spain
| | - Consuelo Borras
- Freshage Research Group. Department of Physiology, Faculty of Medicine, University of Valencia, CIBERFES, INCLIVA, Avenida Blasco Ibañez, 15, Valencia, Spain.
| | - Mari Carmen Gomez-Cabrera
- Freshage Research Group. Department of Physiology, Faculty of Medicine, University of Valencia, CIBERFES, INCLIVA, Avenida Blasco Ibañez, 15, Valencia, Spain
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230
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Said SA, Isedowo R, Guerin C, Nar NN, Lillie L, Bukovac S, Simone JJ, Green MR, McCormick CM, Stuart JA. Effects of long-term dietary administration of estrogen receptor-beta agonist diarylpropionitrile on ovariectomized female ICR (CD-1) mice. GeroScience 2018; 40:393-403. [PMID: 30099673 DOI: 10.1007/s11357-018-0038-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 08/02/2018] [Indexed: 12/18/2022] Open
Abstract
Diarylpropionitrile (DPN) is an estrogen receptor-β-specific agonist that has been linked to neuroprotection, preserving cognitive function with age, the suppression of anxiety-like behaviors, inhibition of cancer growth, and other positive properties. We hypothesized that DPN may have pro-longevity properties. DPN was administered via feed at a dose corresponding to approximately 3 mg/kg/day to ovariectomized female mice beginning at 7 months of age. Mice were followed for the duration of their lifespans while monitoring body mass, aspects of behavior, learning, memory, and frailty. DPN-treated mice gained more body mass over the first 2 years of age (17 months of the study). A test of voluntary running behavior at 24 months of age behavior revealed no deficits in DPN-treated mice, which were as likely as control mice to engage in extended bouts of wheel running, and did so at higher average speeds. DPN administration had anxiolytic-like effects when measured using an elevated plus maze at 9 months of age. A mouse frailty index was used to assess age-related changes. The correlation between age and frailty differed between control and DPN-treated mice. Overall, dietary DPN administration had some beneficial effects on the aging phenotype of ovariectomized female mice with few significant detrimental effects.
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Affiliation(s)
- Sherry A Said
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Rachel Isedowo
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Christilynn Guerin
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Navreek N Nar
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Leesa Lillie
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Shawn Bukovac
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada.,Department of Psychology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Jonathan J Simone
- Department of Psychology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Matthew R Green
- Department of Psychology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Cheryl M McCormick
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada.,Department of Psychology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Jeffrey A Stuart
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada.
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231
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Mock JT, Knight SG, Vann PH, Wong JM, Davis DL, Forster MJ, Sumien N. Gait Analyses in Mice: Effects of Age and Glutathione Deficiency. Aging Dis 2018; 9:634-646. [PMID: 30090652 PMCID: PMC6065294 DOI: 10.14336/ad.2017.0925] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 09/25/2017] [Indexed: 12/31/2022] Open
Abstract
Minor changes (~0.1 m/s) in human gait speed are predictive of various measures of decline and can be used to identify at-risk individuals prior to further decline. These associations are possible due to an abundance of human clinical research. However, age-related gait changes are not well defined in rodents, even though rodents are used as the primary pre-clinical model for many disease states as well as aging research. Our study investigated the usefulness of a novel automated system, the CatWalk™ XT, to measure age-related differences in gait. Furthermore, age-related functional declines have been associated with decreases in the reduced to oxidized glutathione ratio leading to a pro-oxidizing cellular shift. Therefore the secondary aim of this study was to determine whether chronic glutathione deficiency led to exacerbated age-associated impairments. Groups of male and female wild-type (gclm+/+) and knock-out (gclm-/-) mice aged 4, 10 and 17 months were tested on the CatWalk and gait measurements recorded. Similar age-related declines in all measures of gait were observed in both males and females, and chronic glutathione depletion was associated with some delays in age-related declines, which were further exacerbated. In conclusion, the CatWalk is a useful tool to assess gait changes with age, and further studies will be required to identify the potential compensating mechanisms underlying the effects observed with the chronic glutathione depletion.
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Affiliation(s)
- J Thomas Mock
- Department of Pharmacology & Neuroscience, Center for Neuroscience Discovery, Institute for Healthy Aging, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX, 76107 USA
| | - Sherilynn G Knight
- Department of Pharmacology & Neuroscience, Center for Neuroscience Discovery, Institute for Healthy Aging, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX, 76107 USA
| | - Philip H Vann
- Department of Pharmacology & Neuroscience, Center for Neuroscience Discovery, Institute for Healthy Aging, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX, 76107 USA
| | - Jessica M Wong
- Department of Pharmacology & Neuroscience, Center for Neuroscience Discovery, Institute for Healthy Aging, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX, 76107 USA
| | - Delaney L Davis
- Department of Pharmacology & Neuroscience, Center for Neuroscience Discovery, Institute for Healthy Aging, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX, 76107 USA
| | - Michael J Forster
- Department of Pharmacology & Neuroscience, Center for Neuroscience Discovery, Institute for Healthy Aging, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX, 76107 USA
| | - Nathalie Sumien
- Department of Pharmacology & Neuroscience, Center for Neuroscience Discovery, Institute for Healthy Aging, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX, 76107 USA
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232
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Sukoff Rizzo SJ, Anderson LC, Green TL, McGarr T, Wells G, Winter SS. Assessing Healthspan and Lifespan Measures in Aging Mice: Optimization of Testing Protocols, Replicability, and Rater Reliability. ACTA ACUST UNITED AC 2018; 8:e45. [DOI: 10.1002/cpmo.45] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Stacey J. Sukoff Rizzo
- Mouse Neurobehavioral Phenotyping Facility, Center for Biometric Analysis, The Jackson Laboratory; Bar Harbor Maine
| | - Laura C. Anderson
- Mouse Neurobehavioral Phenotyping Facility, Center for Biometric Analysis, The Jackson Laboratory; Bar Harbor Maine
| | - Torrian L. Green
- Mouse Neurobehavioral Phenotyping Facility, Center for Biometric Analysis, The Jackson Laboratory; Bar Harbor Maine
| | - Tracy McGarr
- Mouse Neurobehavioral Phenotyping Facility, Center for Biometric Analysis, The Jackson Laboratory; Bar Harbor Maine
| | - Gaylynn Wells
- Mouse Neurobehavioral Phenotyping Facility, Center for Biometric Analysis, The Jackson Laboratory; Bar Harbor Maine
| | - Shawn S. Winter
- Mouse Neurobehavioral Phenotyping Facility, Center for Biometric Analysis, The Jackson Laboratory; Bar Harbor Maine
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233
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Kane AE, Shin S, Wong AA, Fertan E, Faustova NS, Howlett SE, Brown RE. Sex Differences in Healthspan Predict Lifespan in the 3xTg-AD Mouse Model of Alzheimer's Disease. Front Aging Neurosci 2018; 10:172. [PMID: 29946252 PMCID: PMC6005856 DOI: 10.3389/fnagi.2018.00172] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 05/18/2018] [Indexed: 01/05/2023] Open
Abstract
Mouse models of Alzheimer's disease (AD) exhibit marked differences in life expectancy depending on their genotype and sex. The assessment of frailty could provide a measure of healthspan to facilitate comparisons between different AD models. We used a validated mouse frailty index (FI) assessment tool to explore genotype and sex differences in lifespan and healthspan of 3xTg-AD mice and their B6129F2 wild-type (WT) controls. This tool is based on an approach commonly used in people and quantifies frailty by counting the accumulation of age-related health deficits. The number of deficits in an individual divided by the total number measured yields an FI score theoretically between 0 and 1, with higher scores denoting more frailty. Male 3xTg-AD mice aged 300-600 days had higher FI scores (Mean FI = 0.21 ± 0.03) than either male WT (Mean FI = 0.15 ± 0.01) or female 3xTg-AD mice (Mean FI = 0.10 ± 0.01), and the elevated frailty scores were accompanied by parallel increases in mortality. Frailty increased exponentially with age, and higher rates of deficit accumulation elevated mortality risk in all groups of mice. When mice were stratified by FI score, frailty predicted mortality, at least in females. Therefore, the mouse clinical FI provides a valuable tool for evaluating healthspan in mouse models of AD with different lifespans.
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Affiliation(s)
- Alice E. Kane
- Department of Pharmacology, Dalhousie University, Halifax, NS, Canada
| | - Sooyoun Shin
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, NS, Canada
| | - Aimee A. Wong
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, NS, Canada
| | - Emre Fertan
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, NS, Canada
| | - Natalia S. Faustova
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, NS, Canada
| | - Susan E. Howlett
- Department of Pharmacology, Dalhousie University, Halifax, NS, Canada
- Division of Geriatric Medicine, Department of Medicine, Dalhousie University, Halifax, NS, Canada
| | - Richard E. Brown
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, NS, Canada
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234
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Li S, Nie Y, Zhan J, Wang Y, Huang W, Wang Y, He J, Liu Y. The analysis of correlation between frailty index and postoperative complications of aged patients with nodular goiter. Aging Med (Milton) 2018; 1:18-22. [PMID: 31942475 PMCID: PMC6880665 DOI: 10.1002/agm2.12016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 04/02/2018] [Indexed: 01/17/2023] Open
Abstract
OBJECTIVE To explore the correlation between frailty index (FI) and postoperative complications of aged patients with nodular goiter (NG). METHODS A total of 120 aged patients with NG undergoing operative treatment from May 2013 to October 2015 in our hospital were selected. All of them were divided into 3 groups according to the FI as follows: nonfrail group (FI < 0.2), intermediately frail group (0.2 ≤ FI < 0.4), and frail group (FI ≥ 0.4). Clinical data of patients about general data, body mass index, American Society of Anesthesiology (ASA) classification, hospital stays, and postoperative complications were examined. Then, the correlations between the indexes above and FI were examined. RESULTS Frailty index and the ASA classification have some relevance (r = .265, P = .007). The postoperative complication rates of total nonfrail group, intermediately frail group, and frail group were, respectively, 4 cases (11.4%), 11 cases (31.4%), and 24 cases (48.0%). With the increase in FI, the incidence of postoperative complications and hospital stays had also significantly increased. The area under receiver operating characteristic curve examining frailty's ability to forecast postoperative complications was 0. 815 (95% CI: 0.675-0.954, P = .000). CONCLUSION The level of frailty index is a risk factor for postoperative complications of aged patients with NG. The preoperative frailty index evaluation can provide reference evidence for the treatment of aged NG patients undergoing surgery.
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Affiliation(s)
- Shuang Li
- Department of Geriatricsthe Second Xiangya HospitalCentral South UniversityChangshaChina
| | - Yue Nie
- Department of Geriatricsthe Third Hospital of ChangshaChangshaChina
| | - Junkun Zhan
- Department of Geriatricsthe Second Xiangya HospitalCentral South UniversityChangshaChina
| | - Yanjiao Wang
- Department of Geriatricsthe Second Xiangya HospitalCentral South UniversityChangshaChina
| | - Wu Huang
- Department of Geriatricsthe Second Xiangya HospitalCentral South UniversityChangshaChina
| | - Yi Wang
- Department of Geriatricsthe Second Xiangya HospitalCentral South UniversityChangshaChina
| | - Jieyu He
- Department of Geriatricsthe Second Xiangya HospitalCentral South UniversityChangshaChina
| | - Youshuo Liu
- Department of Geriatricsthe Second Xiangya HospitalCentral South UniversityChangshaChina
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235
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Sayed RKA, Fernández-Ortiz M, Diaz-Casado ME, Rusanova I, Rahim I, Escames G, López LC, Mokhtar DM, Acuña-Castroviejo D. The Protective Effect of Melatonin Against Age-Associated, Sarcopenia-Dependent Tubular Aggregate Formation, Lactate Depletion, and Mitochondrial Changes. J Gerontol A Biol Sci Med Sci 2018; 73:1330-1338. [DOI: 10.1093/gerona/gly059] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 03/18/2018] [Indexed: 12/16/2022] Open
Affiliation(s)
- Ramy K A Sayed
- Instituto de Biotecnología, Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Spain
- Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Sohag University, Egypt
| | - Marisol Fernández-Ortiz
- Instituto de Biotecnología, Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Spain
- Departamento de Fisiología, Facultad de Medicina, Universidad de Granada, Spain
| | - María E Diaz-Casado
- Instituto de Biotecnología, Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Spain
- Departamento de Fisiología, Facultad de Medicina, Universidad de Granada, Spain
| | - Iryna Rusanova
- Instituto de Biotecnología, Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Spain
- Departamento de Fisiología, Facultad de Medicina, Universidad de Granada, Spain
- CIBER de Fragilidad y Envejecimiento, Ibs. Granada, Unidad de Gestión Clínica de Laboratorios Clínicos, Complejo Hospitalario de Granada, Spain
| | - Ibtissem Rahim
- Instituto de Biotecnología, Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Spain
- Laboratory of Cellular and Molecular Biology, Faculty of Science Biologiques, University of Science and Technology Houari Boumedienne (USTHB), Algeria
| | - Germaine Escames
- Instituto de Biotecnología, Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Spain
- Departamento de Fisiología, Facultad de Medicina, Universidad de Granada, Spain
- CIBER de Fragilidad y Envejecimiento, Ibs. Granada, Unidad de Gestión Clínica de Laboratorios Clínicos, Complejo Hospitalario de Granada, Spain
| | - Luis C López
- Instituto de Biotecnología, Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Spain
- Departamento de Fisiología, Facultad de Medicina, Universidad de Granada, Spain
- CIBER de Fragilidad y Envejecimiento, Ibs. Granada, Unidad de Gestión Clínica de Laboratorios Clínicos, Complejo Hospitalario de Granada, Spain
| | - Doaa M Mokhtar
- Department of Anatomy and Histology, Faculty of Veterinary Medicine, Assiut University, Egypt
| | - Darío Acuña-Castroviejo
- Instituto de Biotecnología, Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Spain
- Departamento de Fisiología, Facultad de Medicina, Universidad de Granada, Spain
- CIBER de Fragilidad y Envejecimiento, Ibs. Granada, Unidad de Gestión Clínica de Laboratorios Clínicos, Complejo Hospitalario de Granada, Spain
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Seldeen KL, Lasky G, Leiker MM, Pang M, Personius KE, Troen BR. High Intensity Interval Training Improves Physical Performance and Frailty in Aged Mice. J Gerontol A Biol Sci Med Sci 2018; 73:429-437. [PMID: 28633487 DOI: 10.1093/gerona/glx120] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 06/16/2017] [Indexed: 10/08/2023] Open
Abstract
Sarcopenia and frailty are highly prevalent in older individuals, increasing the risk of disability and loss of independence. High intensity interval training (HIIT) may provide a robust intervention for both sarcopenia and frailty by achieving both strength and endurance benefits with lower time commitments than other exercise regimens. To better understand the impacts of HIIT during aging, we compared 24-month-old C57BL/6J sedentary mice with those that were administered 10-minute uphill treadmill HIIT sessions three times per week over 16 weeks. Baseline and end point assessments included body composition, physical performance, and frailty based on criteria from the Fried physical frailty scale. HIIT-trained mice demonstrated dramatic improvement in grip strength (HIIT 10.9% vs -3.9% in sedentary mice), treadmill endurance (32.6% vs -2.0%), and gait speed (107.0% vs 39.0%). Muscles from HIIT mice also exhibited greater mass, larger fiber size, and an increase in mitochondrial biomass. Furthermore, HIIT exercise led to a dramatic reduction in frailty scores in five of six mice that were frail or prefrail at baseline, with four ultimately becoming nonfrail. The uphill treadmill HIIT exercise sessions were well tolerated by aged mice and led to performance gains, improvement in underlying muscle physiology, and reduction in frailty.
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Affiliation(s)
- Kenneth Ladd Seldeen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Ginger Lasky
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Merced Marie Leiker
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Manhui Pang
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
| | - Kirkwood Ely Personius
- Department of Rehabilitation Science, School of Public Health and Health Professionals, University at Buffalo, New York
| | - Bruce Robert Troen
- Division of Geriatrics and Palliative Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo and Research Service, Veterans Affairs Western New York Healthcare System
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238
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Yamada Y. Muscle Mass, Quality, and Composition Changes During Atrophy and Sarcopenia. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1088:47-72. [PMID: 30390247 DOI: 10.1007/978-981-13-1435-3_3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Skeletal muscle mass (SMM) and muscle strengh reach their peak in 20s to 40s of age in human life and then decrease with advancing age. The decrease rate of muscle strength or power was twice to four times as large as that of the SMM. Thus, the normalized muscle force (muscle strength divided by SMM) also decreases in aging. It depends on the number of factors in skeletal muscle tissues and neuromuscular system. In human study, SMM cannot be measured directly without dissection so that all of the methodologies are indirect methods to assess SMM, even computing tomography or magnetic resonance imaging. Dual-energy X-ray absorptiometry, ultrasonography, anthropometry, and bioelectrical impedance analysis (BIA) are used as secondary indirect methods to estimate SMM. Recent researches show muscle composition changes in aging, and in particular, the ratio of muscle cell mass (MCM) against SMM decrease and relative expansion of extracellular water (ECW) and extracellular space is observed with advancing age and/or decrease of physical function. The intracellular water (ICW) and ECW estimated by segmental bioelectrical impedance spectroscopy or multifrequency BIA are good biomarkers of the ratio of MCM against SMM in limbs. The BIS and other state-of-the-art technology for assessment of muscle mass, quality, and composition are useful to fully understand the muscle atrophy in a living organism.
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Affiliation(s)
- Yosuke Yamada
- National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition Tokyo, Tokyo, Japan.
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239
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Kane AE, Howlett SE. Differences in Cardiovascular Aging in Men and Women. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1065:389-411. [PMID: 30051398 DOI: 10.1007/978-3-319-77932-4_25] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cardiovascular diseases increase dramatically with age in both men and women. While it is clear that advanced age allows more time for individuals to be exposed to risk factors in general, there is strong evidence that age itself is a major independent risk factor for cardiovascular disease. Indeed, there are distinct age-dependent cellular, structural, and functional changes in both the heart and blood vessels, even in individuals with no clinical evidence of cardiovascular disease. Studies in older humans and in animal models of aging indicate that this age-related remodeling is maladaptive. An emerging view is that the heart and blood vessels accumulate cellular and subcellular deficits with age and these deficits increase susceptibility to disease in older individuals. Aspects of this age-dependent remodeling of the heart and blood vessels differ between the sexes. There is also new evidence that these maladaptive changes are more prominent in older animals and humans with a high degree of frailty. These observations may help explain why men and women are susceptible to different cardiovascular diseases as they age and why frail older adults are most often affected by these diseases.
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Affiliation(s)
- Alice E Kane
- Department of Pharmacology, Dalhousie University, Halifax, NS, Canada
| | - Susan E Howlett
- Department of Pharmacology, Dalhousie University, Halifax, NS, Canada.
- Department of Medicine (Geriatric Medicine), Dalhousie University, Halifax, NS, Canada.
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240
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Cho HC. Age is just a number: frailty better evaluates age-dependent heart rhythm defects. J Physiol 2018; 594:6805. [PMID: 27905134 DOI: 10.1113/jp273370] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Hee Cheol Cho
- Departments of Biomedical Engineering and Pediatrics, Emory University, Georgia Institute of Technology, 1760 Haygood Drive, HSRB E-184, Atlanta, GA, 30322, USA
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241
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Antoch MP, Wrobel M, Kuropatwinski KK, Gitlin I, Leonova KI, Toshkov I, Gleiberman AS, Hutson AD, Chernova OB, Gudkov AV. Physiological frailty index (PFI): quantitative in-life estimate of individual biological age in mice. Aging (Albany NY) 2017; 9:615-626. [PMID: 28325885 PMCID: PMC5391222 DOI: 10.18632/aging.101206] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 03/11/2017] [Indexed: 11/25/2022]
Abstract
The development of healthspan-extending pharmaceuticals requires quantitative estimation of age-related progressive physiological decline. In humans, individual health status can be quantitatively assessed by means of a frailty index (FI), a parameter which reflects the scale of accumulation of age-related deficits. However, adaptation of this methodology to animal models is a challenging task since it includes multiple subjective parameters. Here we report a development of a quantitative non-invasive procedure to estimate biological age of an individual animal by creating physiological frailty index (PFI). We demonstrated the dynamics of PFI increase during chronological aging of male and female NIH Swiss mice. We also demonstrated acceleration of growth of PFI in animals placed on a high fat diet, reflecting aging acceleration by obesity and provide a tool for its quantitative assessment. Additionally, we showed that PFI could reveal anti-aging effect of mTOR inhibitor rapatar (bioavailable formulation of rapamycin) prior to registration of its effects on longevity. PFI revealed substantial sex-related differences in normal chronological aging and in the efficacy of detrimental (high fat diet) or beneficial (rapatar) aging modulatory factors. Together, these data introduce PFI as a reliable, non-invasive, quantitative tool suitable for testing potential anti-aging pharmaceuticals in pre-clinical studies.
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Affiliation(s)
- Marina P Antoch
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Michelle Wrobel
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA.,Everon Biosciences, Inc., Buffalo, NY 14203, USA
| | - Karen K Kuropatwinski
- Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Ilya Gitlin
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Katerina I Leonova
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Ilia Toshkov
- Everon Biosciences, Inc., Buffalo, NY 14203, USA
| | | | - Alan D Hutson
- Biostatistics and Bioinformatics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | | | - Andrei V Gudkov
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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242
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Bellelli G, Moresco R, Panina-Bordignon P, Arosio B, Gelfi C, Morandi A, Cesari M. Is Delirium the Cognitive Harbinger of Frailty in Older Adults? A Review about the Existing Evidence. Front Med (Lausanne) 2017; 4:188. [PMID: 29167791 PMCID: PMC5682301 DOI: 10.3389/fmed.2017.00188] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 10/20/2017] [Indexed: 12/12/2022] Open
Abstract
Frailty is a clinical syndrome defined by the age-related depletion of the individual’s homeostatic reserves, determining an increased susceptibility to stressors and disproportionate exposure to negative health changes. The physiological systems that are involved in the determination of frailty are mutually interrelated, so that when decline starts in a given system, implications may also regard the other systems. Indeed, it has been shown that the number of abnormal systems is more predictive of frailty than those of the abnormalities in any particular system. Delirium is a transient neurocognitive disorder, characterized by an acute onset and fluctuating course, inattention, cognitive dysfunction, and behavioral abnormalities, that complicates one out of five hospital admissions. Delirium is independently associated with the same negative outcomes of frailty and, like frailty, its pathogenesis is usually multifactorial, depending on complex inter-relationships between predisposing and precipitating factors. By definition, a somatic cause should be identified, or at least suspected, to diagnose delirium. Delirium and frailty potentially share multiple pathophysiologic mechanisms and pathways, meaning that they could be thought of as the two sides to the same coin. This review aims at summarizing the existing evidence, referring both to human and animal models, to postulate that delirium may represent the cognitive harbinger of a state of frailty in older persons experiencing an acute clinical event.
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Affiliation(s)
- Giuseppe Bellelli
- Geriatric Unit, San Gerardo Hospital, Monza, Italy.,School of Medicine and Surgery, University Milano-Bicocca, Milan, Italy
| | - Rosamaria Moresco
- School of Medicine and Surgery, University Milano-Bicocca, Milan, Italy.,National Research Council (CNR), Nuclear Medicine Department, San Raffaele Hospital (IRCCS), Milan, Italy
| | | | - Beatrice Arosio
- Geriatric Unit, Department of Medical Sciences and Community Health, University of Milano, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Cecilia Gelfi
- Department of Biomedical Sciences for Health, University of Milano, Segrate, Italy
| | - Alessandro Morandi
- Department of Rehabilitation and Aged Care, Casa di Cura "Ancelle della Carità", Fondazione Teresa Camplani, Cremona, Italy
| | - Matteo Cesari
- Geriatric Unit, Fondazione IRCCS Ca 'Granda, Ospedale Maggiore Policlinico, Milan, Italy
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243
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Kane AE, Howlett SE. Novel cardioprotection strategies for the aged heart: evidence from pre-clinical studies. Clin Exp Pharmacol Physiol 2017; 43:1251-1260. [PMID: 27626269 DOI: 10.1111/1440-1681.12668] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 09/01/2016] [Accepted: 09/09/2016] [Indexed: 11/30/2022]
Abstract
The incidence of cardiovascular disease is rising as the population ages. This has led to an increase in the need to perform cardiac surgery in older patients. However, aged hearts are particularly susceptible to reperfusion injury following periods of myocardial ischaemia that occur during cardiac surgery. Indeed, older adults experience myocardial dysfunction and reduced survival post-surgery compared to younger people and certain groups, including older women and frail older adults, are at particular risk. This highlights the need to design cardioprotective strategies specifically for the ageing heart. Cardioprotection during surgery is often accomplished by perfusing the heart with chemical arresting agents, known as cardioplegic solutions. New protective strategies have been developed and tested in animal models, where cardioplegic solutions have been modified by changing their temperature, chemical components and/or the frequency of delivery. In addition, drugs designed to activate cardioprotective mechanisms or to inhibit mechanisms involved in injury have been added to improve the efficacy of these solutions. However, most experimental studies have developed and optimized cardioplegic solutions in hearts from younger male animals. This review discusses pre-clinical models used to optimize cardioplegic solutions, with an emphasis on the few studies that have used hearts from older animals. Pharmacologic agents that have been shown to enhance the benefits of cardioplegia in younger hearts and could, in theory, protect vulnerable older hearts are also considered. We emphasize the need to conduct studies in frail older animals of both sexes to facilitate translation of laboratory-based observations to the clinic.
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Affiliation(s)
- Alice E Kane
- Department of Pharmacology, Dalhousie University, NS, B3H 4R2, Canada
| | - Susan E Howlett
- Department of Pharmacology, Dalhousie University, NS, B3H 4R2, Canada.,Department of Medicine (Geriatric Medicine), Dalhousie University, Halifax, NS, B3H 4R2, Canada.,Institute of Cardiovascular Sciences, University of Manchester, Manchester, UK
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244
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Newman JC, Covarrubias AJ, Zhao M, Yu X, Gut P, Ng CP, Huang Y, Haldar S, Verdin E. Ketogenic Diet Reduces Midlife Mortality and Improves Memory in Aging Mice. Cell Metab 2017; 26:547-557.e8. [PMID: 28877458 PMCID: PMC5605815 DOI: 10.1016/j.cmet.2017.08.004] [Citation(s) in RCA: 312] [Impact Index Per Article: 44.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 06/16/2017] [Accepted: 08/07/2017] [Indexed: 12/16/2022]
Abstract
Ketogenic diets recapitulate certain metabolic aspects of dietary restriction such as reliance on fatty acid metabolism and production of ketone bodies. We investigated whether an isoprotein ketogenic diet (KD) might, like dietary restriction, affect longevity and healthspan in C57BL/6 male mice. We find that Cyclic KD, KD alternated weekly with the Control diet to prevent obesity, reduces midlife mortality but does not affect maximum lifespan. A non-ketogenic high-fat diet (HF) fed similarly may have an intermediate effect on mortality. Cyclic KD improves memory performance in old age, while modestly improving composite healthspan measures. Gene expression analysis identifies downregulation of insulin, protein synthesis, and fatty acid synthesis pathways as mechanisms common to KD and HF. However, upregulation of PPARα target genes is unique to KD, consistent across tissues, and preserved in old age. In all, we show that a non-obesogenic ketogenic diet improves survival, memory, and healthspan in aging mice.
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Affiliation(s)
- John C Newman
- Buck Institute for Research on Aging, Novato, CA 94945, USA; UCSF Division of Geriatrics, San Francisco, CA 94118, USA; Gladstone Institute of Virology and Immunology, San Francisco, CA 94158, USA
| | | | - Minghao Zhao
- UCSF Global Health Sciences, San Francisco, CA 94158, USA
| | - Xinxing Yu
- UCSF Division of Geriatrics, San Francisco, CA 94118, USA
| | - Philipp Gut
- Gladstone Institute of Virology and Immunology, San Francisco, CA 94158, USA
| | - Che-Ping Ng
- Buck Institute for Research on Aging, Novato, CA 94945, USA
| | - Yu Huang
- Gladstone Institute of Cardiovascular Disease, San Francisco, CA 94158, USA
| | - Saptarsi Haldar
- Gladstone Institute of Cardiovascular Disease, San Francisco, CA 94158, USA
| | - Eric Verdin
- Buck Institute for Research on Aging, Novato, CA 94945, USA; UCSF Division of Geriatrics, San Francisco, CA 94118, USA; Gladstone Institute of Virology and Immunology, San Francisco, CA 94158, USA.
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245
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A frailty index from common clinical and laboratory tests predicts increased risk of death across the life course. GeroScience 2017; 39:447-455. [PMID: 28866737 PMCID: PMC5636769 DOI: 10.1007/s11357-017-9993-7] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Accepted: 08/17/2017] [Indexed: 01/28/2023] Open
Abstract
A frailty index (FI) based entirely on common clinical and laboratory tests might offer scientific advantages in understanding ageing and pragmatic advantages in screening. Our main objective was to compare an FI based on common laboratory tests with an FI based on self-reported data; we additionally investigated if the combination of subclinical deficits with clinical ones increased the ability of the FI to predict mortality. In this secondary analysis of the 2003–2004 and 2005–2006 National Health and Nutrition Examination Survey data, 8888 individuals aged 20+ were evaluated. Three FIs were constructed: a 36-item FI using self-reported questionnaire data (FI-Self-report); a 32-item FI using data from laboratory test values plus pulse and blood pressure measures (FI-Lab); and a 68-item FI that combined all items from each index (FI-Combined). The mean FI-Lab score was 0.15 ± 0.09, the FI-Self-report was 0.11 ± 0.11 and FI-Combined was 0.13 ± 0.08. Each index showed some typical FI characteristics (skewed distribution with long right tail, non-linear increase with age). Even so, there were fewer people with low frailty levels and a slower increase with age for the FI-Lab compared to the FI-Self-report. Higher frailty level was associated with higher risk of death, although it was strongest at older ages. Both FI-Lab and FI-Self-report remained significant in a combined model predicting death. The FI-Lab was feasible and valid, demonstrating that even subclinical deficit accumulation increased mortality risk. This suggests that deficit accumulation, from the subcellular to the clinically visible is a useful construct that may advance our understanding of the ageing process.
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246
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Mitnitski A, Howlett SE, Rockwood K. Heterogeneity of Human Aging and Its Assessment. J Gerontol A Biol Sci Med Sci 2017; 72:877-884. [PMID: 27216811 DOI: 10.1093/gerona/glw089] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Accepted: 04/27/2016] [Indexed: 01/15/2023] Open
Abstract
Understanding the heterogeneity in health of older adults is a compelling question in the biology of aging. We analyzed the performance of five measures of health heterogeneity, judging them by their ability to predict mortality. Using clinical and biomarker data on 1,013 participants of the Canadian Study of Health and Aging who were followed for up to 6 years, we calculated two indices of biological age using the Klemera and Doubal method, which controversially includes using chronological age as a "biomarker," and three frailty indices (FIs) that do not include chronological age: a standard clinical FI, an FI from standard laboratory blood tests and blood pressure, and their combination (FI-combined). Predictive validity was tested using Cox proportional hazards analysis and discriminative ability by the area under the receiver-operating characteristic curves. All five measures showed moderate performance that was improved by combining measures to evaluate larger numbers of items. The greatest addition in explanatory power came from the FI-combined that showed the best mortality prediction in an age-adjusted model. More extensive comparisons across different databases are required, but these results do not support including chronological age as a biomarker.
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Affiliation(s)
| | - Susan E Howlett
- Department of Medicine and.,Department of Pharmacology (Division of Geriatric Medicine), Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Physiology, Institute of Cardiovascular Sciences and
| | - Kenneth Rockwood
- Department of Medicine and.,Department of Geriatric Medicine and Institute of Brain, Behaviour and Neurosciences, University of Manchester, UK
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247
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Gomez-Cabrera MC, Garcia-Valles R, Rodriguez-Mañas L, Garcia-Garcia FJ, Olaso-Gonzalez G, Salvador-Pascual A, Tarazona-Santabalbina FJ, Viña J. A New Frailty Score for Experimental Animals Based on the Clinical Phenotype: Inactivity as a Model of Frailty. J Gerontol A Biol Sci Med Sci 2017; 72:885-891. [PMID: 28329258 DOI: 10.1093/gerona/glw337] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 12/29/2016] [Indexed: 01/01/2023] Open
Abstract
The development of animal models to study human frailty is important to test interventions to be translated to the clinical practice. The aim of this work was to develop a score for frailty in experimental animals based in the human frailty phenotype. We also tested the effect of physical inactivity in the development of frailty as determined by our score. Male C57Bl/6J mice, individually caged, were randomly assigned to one of two groups: sedentary (inactive) or spontaneous wheel-runners. We compared the sedentary versus the active lifestyle in terms of frailty by evaluating the clinical criteria used in humans: unintentional weight loss; poor endurance (running time); slowness (running speed); weakness (grip strength), and low activity level (motor coordination) at five different ages: 17, 20, 23, 26 and 28 months of age. Each criterion had a designated cut-off point to identify the mice with the lowest performance. Lifelong spontaneous exercise significantly retards frailty. On the contrary sedentary animals become frail as they age. Thus, physical inactivity is a model of frailty in experimental animals. Our frailty score provides a tool to evaluate interventions in mice prior to translating them to clinical practice.
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Affiliation(s)
- Mari Carmen Gomez-Cabrera
- Department of Physiology, University of Valencia, Fundación Investigación Hospital Clínico Universitario/INCLIVA, Spain
| | - Rebeca Garcia-Valles
- Department of Physiology, University of Valencia, Fundación Investigación Hospital Clínico Universitario/INCLIVA, Spain
| | - Leocadio Rodriguez-Mañas
- Servicio de Geriatría, Hospital Universitario de Getafe, Ministerio de Sanidad y Consumo, Madrid, Spain. Red Temática de Investigación Cooperativa en Envejecimiento y Fragilidad (RETICEF), Instituto de Salud Carlos III
| | | | - Gloria Olaso-Gonzalez
- Department of Physiology, University of Valencia, Fundación Investigación Hospital Clínico Universitario/INCLIVA, Spain
| | - Andrea Salvador-Pascual
- Department of Physiology, University of Valencia, Fundación Investigación Hospital Clínico Universitario/INCLIVA, Spain
| | - Francisco Jose Tarazona-Santabalbina
- Department of Geriatric Medicine, Hospital Universitario de la Ribera, Alzira, Spain.,Faculty of Nursing and Medicine, Catholic University of Valencia San Vicente Mártir, Spain
| | - Jose Viña
- Department of Physiology, University of Valencia, Fundación Investigación Hospital Clínico Universitario/INCLIVA, Spain
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248
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Kane AE, Huizer-Pajkos A, Mach J, Mitchell SJ, de Cabo R, Le Couteur DG, Howlett SE, Hilmer SN. A Comparison of Two Mouse Frailty Assessment Tools. J Gerontol A Biol Sci Med Sci 2017; 72:904-909. [PMID: 28549083 DOI: 10.1093/gerona/glx009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Indexed: 01/08/2023] Open
Abstract
The mouse clinical frailty index and the mouse frailty phenotype assessment are two recently developed tools used to assess frailty in mice. The objectives of this study were to investigate whether the same mice are identified as frail with both tools and to examine the association of each of the assessment tools with age and frailty-related outcomes. Frailty was measured using both tools in old (~24 months; n = 36) C57BL/6 male mice. After 2 weeks, blood pressure and heart rate were measured and serum samples were collected for analysis of alanine aminotransferase, creatinine, and albumin levels. The mouse frailty phenotype assessment identified no mice as frail but modification of the assessment tool identified six mice as frail. The mouse clinical frailty index identified 16 mice as frail and the agreement between the two scales was 50.0%. Increasing clinical frailty index scores were correlated with low serum alanine aminotransferase, as well as decreased heart rate, and reduced heart rate variance. We conclude that, consistent with equivalent frailty assessment scales in humans, both tools have value but do not necessarily identify the same mice as frail.
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Affiliation(s)
- Alice E Kane
- Laboratory of Ageing and Pharmacology, Kolling Institute of Medical Research and Sydney Medical School, University of Sydney, New South Wales, Australia.,Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Aniko Huizer-Pajkos
- Laboratory of Ageing and Pharmacology, Kolling Institute of Medical Research and Sydney Medical School, University of Sydney, New South Wales, Australia.,Departments of Clinical Pharmacology and Aged Care, Royal North Shore Hospital, Sydney, New South Wales, Australia
| | - John Mach
- Laboratory of Ageing and Pharmacology, Kolling Institute of Medical Research and Sydney Medical School, University of Sydney, New South Wales, Australia.,Departments of Clinical Pharmacology and Aged Care, Royal North Shore Hospital, Sydney, New South Wales, Australia
| | - Sarah J Mitchell
- Translational Gerontology Branch, National Institute on Aging, National Institutes of Health, Baltimore, Maryland
| | - Rafael de Cabo
- Translational Gerontology Branch, National Institute on Aging, National Institutes of Health, Baltimore, Maryland
| | - David G Le Couteur
- Biogerontology Laboratory, Centre for Education and Research on Aging and ANZAC Research Institute, Sydney, New South Wales, Australia
| | - Susan E Howlett
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Sarah N Hilmer
- Laboratory of Ageing and Pharmacology, Kolling Institute of Medical Research and Sydney Medical School, University of Sydney, New South Wales, Australia.,Departments of Clinical Pharmacology and Aged Care, Royal North Shore Hospital, Sydney, New South Wales, Australia
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249
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Miller MG, Thangthaeng N, Shukitt-Hale B. A Clinically Relevant Frailty Index for Aging Rats. J Gerontol A Biol Sci Med Sci 2017; 72:892-896. [PMID: 28329224 DOI: 10.1093/gerona/glw338] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 01/04/2017] [Indexed: 11/12/2022] Open
Abstract
Frailty is a clinical syndrome that is increasingly prevalent during aging. Frailty involves the confluence of reduced strength, speed, physical activity, and endurance and is associated with adverse health outcomes. The present study adapts existing clinical and preclinical indices of frailty to the Fischer (F344) rat. Male F344 rats (n = 133; 17 mo) completed a battery of behavioral tasks, including forelimb wire suspension (strength), rotarod (speed), open field (physical activity), and inclined screen (endurance). Rats that performed poorly (lowest quintile) on two tasks were considered mildly frail (17.29%, n = 23), and rats that performed poorly on 3-4 tasks were considered frail (2.26%, n = 3). Logistic regression of 100-day survival revealed that mildly frail rats were 3.8 times and frail rats were 27.5 times more likely to die during that period than nonfrail rats (p = .038; 95% confidence interval: 2.030, 372.564). The selected criterion tests, cutoff points, and index provide a potential tool for identifying frailty in aged F344 rats, which is consistent with existing frailty indices for humans and mice.
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Affiliation(s)
- Marshall G Miller
- USDA-ARS, Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts
| | - Nopporn Thangthaeng
- USDA-ARS, Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts
| | - Barbara Shukitt-Hale
- USDA-ARS, Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts
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250
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Yorke A, Kane AE, Hancock Friesen CL, Howlett SE, O'Blenes S. Development of a Rat Clinical Frailty Index. J Gerontol A Biol Sci Med Sci 2017; 72:897-903. [PMID: 28158648 PMCID: PMC5458399 DOI: 10.1093/gerona/glw339] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 12/19/2016] [Indexed: 12/02/2022] Open
Abstract
Rats are a commonly used model for aging studies, and a frailty assessment tool for rats would be of considerable value. There has been a recent focus on the development of preclinical models of frailty in mice. A mouse clinical frailty index (FI) was developed based on clinical frailty assessment tools. This FI measures the accumulation of clinically evident health-related deficits in mice. This paper aimed to develop a rat clinical FI. Male Fischer 344 rats were aged from 6 to 9 months (n = 12), and from 13 to 21 months (n = 41). A FI comprised of 27 health-related deficits was developed from a review of the literature and consultation with a veterinarian. Deficits were scored 0 if absent, 0.5 if mild, or 1 if severe. A FI score was determined for each rat every 3–4 months, and for the older group mortality was assessed up to 21 months. Mean FI scores significantly increased at each time point for the older rats. A high FI score measured at both 17 months of age and terminally was also associated with decreased probability of survival as assessed with Kaplan–Meier curves. The rat clinical FI has significant value for use in aging and interventional studies.
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Affiliation(s)
- Amy Yorke
- Physiology and Biophysics Department
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