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Alonso-Puyo J, Izagirre-Fernandez O, Crende O, Valdivia A, García-Gallastegui P, Sanz B. Experimental models as a tool for research on sarcopenia: A narrative review. Ageing Res Rev 2024; 101:102534. [PMID: 39369798 DOI: 10.1016/j.arr.2024.102534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 09/24/2024] [Accepted: 09/30/2024] [Indexed: 10/08/2024]
Abstract
Sarcopenia is a musculoskeletal disorder related to muscle mass and function; as the worldwide population ages, its growing prevalence means a decline in quality of life and an increased burden for public health systems. As sarcopenia is a reversible condition, its early diagnosis is of utmost importance. Consensus definitions and diagnosis protocols for sarcopenia have been evolving for a long time, and the identification of molecular pathways subjacent to sarcopenia is a growing research area. The use of liquid biopsies to identify circulating molecules does not provide information about specific regulatory pathways or biomarkers in relevant tissue, and the use of skeletal muscle biopsies from older people has many limitations. Complementary tools are therefore necessary to advance the knowledge of relevant molecular aspects. The development of experimental models, such as animal, cellular, or bioengineered tissue, together with knock-in or knock-out strategies, could therefore be of great interest. This narrative review will explore experimental models of healthy muscle and aged muscle cells as a tool for research on sarcopenia. We will summarize the literature and present relevant experimental models in terms of their advantages and disadvantages. All of the presented approaches could potentially contribute to the accurate and early diagnosis, follow-up, and possible treatment of sarcopenia.
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Affiliation(s)
- Janire Alonso-Puyo
- Physiology Department, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Barrio Sarriena, sn., Leioa 48940, Spain
| | - Oihane Izagirre-Fernandez
- Physiology Department, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Barrio Sarriena, sn., Leioa 48940, Spain
| | - Olatz Crende
- Cell Biology and Histology Department, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Barrio Sarriena, sn., Leioa 48940, Spain
| | - Asier Valdivia
- Cell Biology and Histology Department, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Barrio Sarriena, sn., Leioa 48940, Spain
| | - Patricia García-Gallastegui
- Physiology Department, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Barrio Sarriena, sn., Leioa 48940, Spain.
| | - Begoña Sanz
- Physiology Department, Faculty of Medicine and Nursery, University of the Basque Country (UPV/EHU), Barrio Sarriena, sn., Leioa 48940, Spain; Biocruces Bizkaia Health Research Institute, Barakaldo, Bizkaia 48903, Spain.
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Tey SR, Anderson RS, Yu CH, Robertson S, Kletzien H, Connor NP, Tanaka K, Ohkawa Y, Suzuki M. Cellular and transcriptomic changes by the supplementation of aged rat serum in human pluripotent stem cell-derived myogenic progenitors. Front Cell Dev Biol 2024; 12:1481491. [PMID: 39474351 PMCID: PMC11518775 DOI: 10.3389/fcell.2024.1481491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2024] [Accepted: 09/25/2024] [Indexed: 11/06/2024] Open
Abstract
Introduction The changing composition of non-cell autonomous circulating factors in blood as humans age is believed to play a role in muscle mass and strength loss. The mechanisms through which these circulating factors act in age-related skeletal muscle changes is not fully understood. In this study, we used human myogenic progenitors derived from human pluripotent stem cells to study non-cell autonomous roles of circulating factors during the process of myogenic differentiation. Methods Myogenic progenitors from human embryonic stem cells (ESCs) and induced pluripotent stem cells (iPSCs) were supplemented with serum samples from aged or young Fischer 344 × Brown Norway F1-hybrid rats. The effect of aged or young serum supplementation on myogenic progenitor proliferation, myotube formation capacity, differentiation, and early transcriptomic profiles were analyzed. Results We found that aged rat serum supplementation significantly reduced cell proliferation and increased cell death in both ESC- and iPSC-derived myogenic progenitors. Next, we found that the supplementation of aged rat serum inhibited myotube formation and maturation during terminal differentiation from progenitors to skeletal myocytes when compared to the cells treated with young adult rat serum. Lastly, we identified that gene expression profiles were affected following serum supplementation in culture. Discussion Together, aged serum supplementation caused cellular and transcriptomic changes in human myogenic progenitors. The current data from our in vitro model possibly simulate non-cell autonomous contributions of blood composition to age-related processes in human skeletal muscle.
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Affiliation(s)
- Sin-Ruow Tey
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, United States
| | - Ryan S. Anderson
- Department of Surgical Sciences, University of Wisconsin-Madison, Madison, WI, United States
| | - Clara H. Yu
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, United States
| | - Samantha Robertson
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, United States
| | - Heidi Kletzien
- Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, United States
- Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
| | - Nadine P. Connor
- Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
- Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, WI, United States
| | - Kaori Tanaka
- Division of Transcriptomics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Yasuyuki Ohkawa
- Division of Transcriptomics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Masatoshi Suzuki
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, United States
- Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, United States
- Stem Cell and Regenerative Medicine Center, University of Wisconsin-Madison, Madison, WI, United States
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Hernandez A, Sun Y, Banerjee A, Yang Y, Verma A, Li Q, Baptista L, Buford TW, Carter CS. Angiotensin (1-7) Delivered Orally via Probiotic in Combination With Exercise: Sex-Dependent Influence on Health Span. J Gerontol A Biol Sci Med Sci 2023; 78:223-226. [PMID: 36124974 PMCID: PMC9951057 DOI: 10.1093/gerona/glac198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Indexed: 11/14/2022] Open
Abstract
Age-related declines in physical and cognitive function can have tremendous, negative impacts on health span and quality of life. Therefore, we investigated the potential of utilizing a probiotic treatment to target the renin-angiotensin system (RAS) in conjunction with moderate exercise to ameliorate age-related declines in cognitive and physical function in aged rats. Herein we utilized a genetically modified angiotensin (1-7), which activates a "complementary" arm of the RAS through binding Mas (AT7) receptors. This process induces several beneficial physiologic effects, including decreased inflammation and enhanced physical/cognitive function. Thus, in this short research report, we suggest the efficacy of this Ang(1-7) releasing Lactobacillus paracasei (LPA) as either an alternative strategy to exercise, or more likely as an adjuvant to moderate exercise, for the prevention of both physical and cognitive decline especially in female rats.
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Affiliation(s)
- Abbi Hernandez
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Yi Sun
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Anisha Banerjee
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - YouFeng Yang
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Amrisha Verma
- Department of Ophthalmology, University of Florida, Gainesville, Florida, USA
| | - Qiuhong Li
- Department of Ophthalmology, University of Florida, Gainesville, Florida, USA
| | - Liliana Baptista
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
- Research Center in Physical Activity, Health and Leisure, Faculty of Sports, University of Porto, Porto, Portugal
| | - Thomas W Buford
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
- Birmingham/Atlanta Geriatric Research, Education, and Clinical Center, Birmingham VA Medical Center, Birmingham, Alabama, USA
| | - Christy S Carter
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
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Yang Y, Banerjee A, Sun Y, Carter CS, Buford TW. Interactive Effects of Enalapril Administration and Novel HIIT Wheel-Bed Training in Aged Rats. FRONTIERS IN REHABILITATION SCIENCES 2021; 2:764686. [PMID: 34901931 PMCID: PMC8662566 DOI: 10.3389/fresc.2021.764686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 10/19/2021] [Indexed: 06/14/2023]
Abstract
INTRODUCTION Growing research suggests that aerobic high-intensity interval training (HIIT) improves cardiovascular function and physical performance compared with moderate intensity continuous training (MICT). However relatively few animal models of HIIT are available to inform about the benefits of this exercise-particularly among older animals. In addition, there is little evidence for how HIIT training interacts with adjuvant pharmacological therapies known to enhance the impact of MCIT in older individuals such as Angiotensin Converting Enzyme (ACE) Inhibitors. PURPOSE The aim of the present study was to establish a HIIT protocol in aged rats based on forced running wheel-bed, and to subsequently (1) establish the feasibility of the HIIT protocol in a proof-of-concept study evaluating interactions between HIIT and (2) the result of combining HIIT + ACE inhibitor treatment using the ACE inhibitor enalapril. METHODS Two groups of rats were used in this study. The feasibility of using wheel-bed for HIIT training was tested in group one (15- and 30-month-old male rats). In the second group, 37 24-month-old Fisher 344 × Brown Norway male rats were randomly divided into four subgroups: control, enalapril, HIIT training group, and HIIT training combined with enalapril administration. The training and administration lasted for 4 weeks. After the intervention, locomotor activity, exercise tolerance, and grip strength were tested. RESULTS Our feasibility study suggested that middle-aged and aged rats were able to successfully complete the HIIT training. In our intervention study, HIIT training alone, regardless of adjuvant enalapril intervention, did raise treadmill exercise tolerance vs. the sedentary condition. Measures of healthspan were not negatively impacted by HIIT training. CONCLUSION The novel HIIT protocol based on forced running wheel-bed was successfully employed in aged rats. We conclude that future studies should compare the results and of multi-modal intervention strategies which include both HIIT and MICT in combination with adjuvant therapies such as enalapril to improve exercise tolerance and other global indices of healthspan.
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Affiliation(s)
- Youfeng Yang
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Anisha Banerjee
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Yi Sun
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Christy S. Carter
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Thomas W. Buford
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
- Geriatric Research Education and Clinical Center, Birmingham VA Medical Center, Birmingham, AL, United States
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Harper SA, Baptista LC, Roberts LM, Wherry SJ, Boxer RS, Hildreth KL, Seay RS, Allman PH, Carter CS, Aban I, Kohrt WM, Buford TW. Angiotensin Converting Enzyme Inhibitors Combined with Exercise for Hypertensive Seniors (The ACES Trial): Study Protocol of a Randomized Controlled Trial. Front Med (Lausanne) 2020; 6:327. [PMID: 32039215 PMCID: PMC6988302 DOI: 10.3389/fmed.2019.00327] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 12/19/2019] [Indexed: 01/13/2023] Open
Abstract
Prior evidence suggests that the choice of antihypertensive medication may influence functional status among older adults with hypertension, particularly in conjunction with exercise. In particular, angiotensin converting enzyme (ACE) inhibitors have shown potential to positively influence function. However, randomized, controlled trials are needed to confirm this hypothesis. This paper outlines an RCT designed to determine if choice of first-line antihypertensive medication influences functional and cardiovascular risk factor responses to exercise among older adults with hypertension. Two hundred and thirteen inactive, community-dwelling adults ≥60 years of age with hypertension and functional limitations will be recruited to engage in a 32-week intervention study. Participants will be randomized to one of three first-line antihypertensive agents: (1) the ACE inhibitor perindopril, (2) the AT1 receptor antagonist losartan, or (3) the thiazide diuretic hydrochlorothiazide (HCTZ). Six weeks after randomization, participants will begin a 20-week structured aerobic exercise intervention. Participants will perform two 45-min center-based sessions coupled with 60 min of home-based walking per week. The primary aim is to determine if perindopril improves self-paced gait speed when compared with losartan and HCTZ. The secondary aim is to determine the relative effect of perindopril on secondary outcomes such as: (a) exercise capacity, (b) body mass and composition, and (c) circulating indices of cardiovascular risk. This RCT is expected to identify differential effects of first-line antihypertensive medications when combined with physical exercise thus have potential implications for antihypertensive prescription guidelines for older adults. Clinical Trial Registration: www.ClinicalTrials.gov, identifier: NCT03295734.
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Affiliation(s)
- Sara A. Harper
- Division of Gerontology, Geriatrics and Palliative Care, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Liliana C. Baptista
- Division of Gerontology, Geriatrics and Palliative Care, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Lisa M. Roberts
- Division of Gerontology, Geriatrics and Palliative Care, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Sarah J. Wherry
- Division of Geriatric Medicine, Department of Medicine, University of Colorado Anschutz Medical Campus, Denver, CO, United States
| | - Rebecca S. Boxer
- Division of Geriatric Medicine, Department of Medicine, University of Colorado Anschutz Medical Campus, Denver, CO, United States
- Kaiser Permanente Colorado, Institute for Health Research, Aurora, CO, United States
| | - Kerry L. Hildreth
- Division of Geriatric Medicine, Department of Medicine, University of Colorado Anschutz Medical Campus, Denver, CO, United States
| | - Regina S. Seay
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - P. Hunter Allman
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Christy S. Carter
- Division of Gerontology, Geriatrics and Palliative Care, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Inmaculada Aban
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Wendy M. Kohrt
- Division of Geriatric Medicine, Department of Medicine, University of Colorado Anschutz Medical Campus, Denver, CO, United States
| | - Thomas W. Buford
- Division of Gerontology, Geriatrics and Palliative Care, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL, United States
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Pronsato L, Milanesi L, Vasconsuelo A. Testosterone induces up-regulation of mitochondrial gene expression in murine C2C12 skeletal muscle cells accompanied by an increase of nuclear respiratory factor-1 and its downstream effectors. Mol Cell Endocrinol 2020; 500:110631. [PMID: 31676390 DOI: 10.1016/j.mce.2019.110631] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 10/25/2019] [Accepted: 10/25/2019] [Indexed: 01/03/2023]
Abstract
The reduction in muscle mass and strength with age, sarcopenia, is a prevalent condition among the elderly, linked to skeletal muscle dysfunction and cell apoptosis. We demonstrated that testosterone protects against H2O2-induced apoptosis in C2C12 muscle cells. Here, we analyzed the effect of testosterone on mitochondrial gene expression in C2C12 skeletal muscle cells. We found that testosterone increases mRNA expression of genes encoded by mitochondrial DNA, such as NADPH dehydrogenase subunit 1 (ND1), subunit 4 (ND4), cytochrome b (CytB), cytochrome c oxidase subunit 1 (Cox1) and subunit 2 (Cox2) in C2C12. Additionally, the hormone induced the expression of the nuclear respiratory factors 1 and 2 (Nrf-1 and Nrf-2), the mitochondrial transcription factors A (Tfam) and B2 (TFB2M), and the optic atrophy 1 (OPA1). The simultaneous treatment with testosterone and the androgen receptor antagonist, Flutamide, reduced these effects. H2O2-oxidative stress induced treatment, significantly decreased mitochondrial gene expression. Computational analysis revealed that mitochondrial DNA contains specific sequences, which the androgen receptor could recognize and bind, probably taking place a direct regulation of mitochondrial transcription by the receptor. These findings indicate that androgen plays an important role in the regulation of mitochondrial transcription and biogenesis in skeletal muscle.
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Affiliation(s)
- Lucía Pronsato
- Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR-CONICET), 8000, Bahía Blanca, Argentina.
| | - Lorena Milanesi
- Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR-CONICET), 8000, Bahía Blanca, Argentina.
| | - Andrea Vasconsuelo
- Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR-CONICET), 8000, Bahía Blanca, Argentina
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Song SB, Park JS, Chung GJ, Lee IH, Hwang ES. Diverse therapeutic efficacies and more diverse mechanisms of nicotinamide. Metabolomics 2019; 15:137. [PMID: 31587111 DOI: 10.1007/s11306-019-1604-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Accepted: 09/30/2019] [Indexed: 11/30/2022]
Abstract
BACKGROUND Nicotinamide (NAM) is a form of vitamin B3 that, when administered at near-gram doses, has been shown or suggested to be therapeutically effective against many diseases and conditions. The target conditions are incredibly diverse ranging from skin disorders such as bullous pemphigoid to schizophrenia and depression and even AIDS. Similar diversity is expected for the underlying mechanisms. In a large portion of the conditions, NAM conversion to nicotinamide adenine dinucleotide (NAD+) may be a major factor in its efficacy. The augmentation of cellular NAD+ level not only modulates mitochondrial production of ATP and superoxide, but also activates many enzymes. Activated sirtuin proteins, a family of NAD+-dependent deacetylases, play important roles in many of NAM's effects such as an increase in mitochondrial quality and cell viability countering neuronal damages and metabolic diseases. Meanwhile, certain observed effects are mediated by NAM itself. However, our understanding on the mechanisms of NAM's effects is limited to those involving certain key proteins and may even be inaccurate in some proposed cases. AIM OF REVIEW This review details the conditions that NAM has been shown to or is expected to effectively treat in humans and animals and evaluates the proposed underlying molecular mechanisms, with the intention of promoting wider, safe therapeutic application of NAM. KEY SCIENTIFIC CONCEPTS OF REVIEW NAM, by itself or through altering metabolic balance of NAD+ and tryptophan, modulates mitochondrial function and activities of many molecules and thereby positively affects cell viability and metabolic functions. And, NAM administration appears to be quite safe with limited possibility of side effects which are related to NAM's metabolites.
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Affiliation(s)
- Seon Beom Song
- Department of Life Science, University of Seoul, Dongdaemun-gu, Seoulsiripdae-ro 163, Seoul, Republic of Korea
| | - Jin Sung Park
- Department of Life Science, University of Seoul, Dongdaemun-gu, Seoulsiripdae-ro 163, Seoul, Republic of Korea
| | - Gu June Chung
- Department of Life Science, University of Seoul, Dongdaemun-gu, Seoulsiripdae-ro 163, Seoul, Republic of Korea
| | - In Hye Lee
- Department of Life Science, Ewha Womans University, Ewhayeodae-gil 52, Seoul, Republic of Korea
| | - Eun Seong Hwang
- Department of Life Science, University of Seoul, Dongdaemun-gu, Seoulsiripdae-ro 163, Seoul, Republic of Korea.
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Del Campo A, Contreras-Hernández I, Castro-Sepúlveda M, Campos CA, Figueroa R, Tevy MF, Eisner V, Casas M, Jaimovich E. Muscle function decline and mitochondria changes in middle age precede sarcopenia in mice. Aging (Albany NY) 2019; 10:34-55. [PMID: 29302020 PMCID: PMC5811241 DOI: 10.18632/aging.101358] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 12/30/2017] [Indexed: 01/02/2023]
Abstract
Sarcopenia is the degenerative loss of muscle mass and strength with aging. Although a role of mitochondrial metabolism in muscle function and in the development of many diseases has been described, the role of mitochondrial topology and dynamics in the process of muscle aging is not fully understood. This work shows a time line of changes in both mitochondrial distribution and skeletal muscle function during mice lifespan. We isolated muscle fibers from flexor digitorum brevis of mice of different ages. A fusion-like phenotype of mitochondria, together with a change in orientation perpendicular to the fiber axis was evident in the Adult group compared to Juvenile and Older groups. Moreover, an increase in the contact area between sarcoplasmic reticulum and mitochondria was evident in the same group. Together with the morphological changes, mitochondrial Ca2+ resting levels were reduced at age 10-14 months and significantly increased in the Older group. This was consistent with a reduced number of mitochondria-to-jSR pairs in the Older group compared to the Juvenile. Our results support the idea of several age-dependent changes in mitochondria that are accentuated in midlife prior to a complete sarcopenic phenotype.
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Affiliation(s)
- Andrea Del Campo
- Center for Exercise, Metabolism and Cancer, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Ignacio Contreras-Hernández
- Center for Exercise, Metabolism and Cancer, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Mauricio Castro-Sepúlveda
- Department of Cellular and Molecular Biology, School of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile.,Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Cristian A Campos
- Center for Exercise, Metabolism and Cancer, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Reinaldo Figueroa
- Center for Genomics and Bioinformatics, Universidad Mayor de Chile, Santiago, Chile
| | - María Florencia Tevy
- Center for Genomics and Bioinformatics, Universidad Mayor de Chile, Santiago, Chile
| | - Verónica Eisner
- Department of Cellular and Molecular Biology, School of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Mariana Casas
- Center for Exercise, Metabolism and Cancer, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile.,Physiology Program, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Enrique Jaimovich
- Center for Exercise, Metabolism and Cancer, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
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Multimodal Intervention to Improve Functional Status in Hypertensive Older Adults: A Pilot Randomized Controlled Trial. J Clin Med 2019; 8:jcm8020196. [PMID: 30736317 PMCID: PMC6406861 DOI: 10.3390/jcm8020196] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 01/30/2019] [Accepted: 01/31/2019] [Indexed: 02/07/2023] Open
Abstract
This pilot randomized controlled trial (RCT) was designed to provide the preliminary data necessary to conduct a full-scale trial to compare the efficacy of differing first-line antihypertensive medications in improving functional status in older adults, when combined with exercise. The primary objectives were to assess study feasibility, safety, and protocol integrity. Dependent outcomes included gait speed, exercise capacity, body composition, and systemic cardiometabolic biomarkers. Thirty-one physically inactive older adults (70.6 ± 6.1 years) with hypertension and functional limitations were randomly assigned to (1) Perindopril (8 mg/day n = 10), (2) Losartan (100 mg/day; n = 13), or (3) Hydrochlorothiazide (HCTZ: 25 mg/day; n = 8). Participants were also assigned to a 24-week multimodal exercise intervention, separated into an aerobic and concurrent (aerobic + resistance) phase to evaluate potential mode effects. Retention was 84% (26/31), and compliance was >90% and >79% with medication and exercise, respectively. A total of 29 adverse events (Perindopril = 5; Losartan = 12; HCTZ = 11) and one unrelated serious adverse event were observed throughout the trial. Overall, this pilot RCT provided critical data and identified several challenges to ultimately designing and implementing a fully powered trial.
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Functional status improves in hypertensive older adults: the long-term effects of antihypertensive therapy combined with multicomponent exercise intervention. Aging Clin Exp Res 2018; 30:1483-1495. [PMID: 29512042 DOI: 10.1007/s40520-018-0925-x] [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: 12/21/2017] [Accepted: 02/26/2018] [Indexed: 12/30/2022]
Abstract
BACKGROUND The increasing prevalence of functionally-limited hypertensive individuals highlights the need for interventions to reduce the burden of hypertension-aging-disability and to maximize the chances of healthy aging. AIM This study aims to compare the effects of multicomponent exercise and different pharmacological treatments on functional status and cardiovascular risk outcomes in hypertensive older adults with comorbidities. METHODS Participants (n = 96) engage in a 3 days/week multicomponent (aerobic + resistance) exercise program and for one of the following three conditions: (1) thiazide-related diuretics (TDs; n = 33, 69.9 ± 9.5 years); (2) calcium channel blockers (CCBs; n = 23, 67.0 ± 9.0 years); (3) and β-blockers (βBs; n = 40, 65.6 ± 7.2 years) medication. Baseline and 2-year follow-up evaluations included the Senior Fitness Test battery, anthropometrics and hemodynamic profile, health-related quality of life (HRQoL; Short-Form Health Survey 36) and health history questionnaires. RESULTS All groups have significantly improved the physical functional status; particularly upper and lower body strength and aerobic endurance and systolic blood pressure. The TDs and βBs groups have diminished the waist circumference and body mass. The CCBs decreased total cholesterol (P = 0.028), perceived better physical functioning, physical component score but also augmented bodily pain (P < 0.05). The βB group decreased triglycerides (P = 0.013). No group differences were found. CONCLUSION Multicomponent exercise training has improved functional status regardless of the antihypertensive medication options. Hypertensive older adults should add exercise training to pharmacological antihypertensive therapy to reduce the rate of physical disability.
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Baptista LC, Amorim AP, Valente-Dos-Santos J, Machado-Rodrigues AM, Veríssimo MT, Martins RA. Antihypertensive monotherapy or combined therapy: which is more effective on functional status? Clin Exp Hypertens 2018; 40:686-694. [PMID: 29336626 DOI: 10.1080/10641963.2018.1425419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
BACKGROUND This study aims to analyze the effects of anti-hypertensive monotherapy and combined therapy on functional status, and cardiovascular risk outcomes in older adults. METHODS This longitudinal non-randomized cohort study, involved hypertensive older adults (n = 440) aged 60 or more years with comorbidities. Participants underwent a community exercise training program and one of the following 2 conditions: i) use of daily mono-dose angiotensin-converting enzyme inhibitors (ACEi; n= 232); ii) combined therapy including ACEi plus other class agent (Combined; n= 208). Baseline and 2-year follow-up evaluations included the functional fitness, health-related quality of life (HRQoL), health history questionnaires, anthropometric and hemodynamic profile. RESULTS Both experimental groups have significantly improved physical functional status, and have significantly decreased blood pressure and waist circumference. ACEi group has significantly reduced body mass and body mass index, the Combined group significantly reduced the waist-to-hip ratio. Additionally, both groups perceived better physical HRQoL. CONCLUSIONS Functional status has improved with ACEi medication and exercise training, regardless the ACEi medication therapy. Exercise training plus ACEi antihypertensive therapy should be recommended into the standard prescription practice to reduce the rate of physical disability among hypertensive older adults.
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Affiliation(s)
- Liliana C Baptista
- a Faculdade de Ciências do Desporto e Educação Física , Universidade de Coimbra , Coimbra , Portugal
| | - André Pinto Amorim
- b Departamento de Ciências do Desporto , Universidade da Beira Interior , Covilhã , Portugal
| | - João Valente-Dos-Santos
- a Faculdade de Ciências do Desporto e Educação Física , Universidade de Coimbra , Coimbra , Portugal.,d Fundação Portuguesa para a Ciência e Tecnologia (SFRH/BPD/100470/2014) , Lisboa , Portugal.,e Institute for Biomedical Imaging and Life Sciences (IBILI), Faculdade de Medicina , Universidade de Coimbra , Coimbra , Portugal.,f Faculdade de Educação Física e Desporto , Universidade Lusófona , Lisboa , Portugal
| | | | | | - Raul A Martins
- a Faculdade de Ciências do Desporto e Educação Física , Universidade de Coimbra , Coimbra , Portugal
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12
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Oliveira LC, Oliveira RG, Pires-Oliveira DADA. Pilates increases the isokinetic muscular strength of the knee extensors and flexors in elderly women. J Bodyw Mov Ther 2017; 21:815-822. [DOI: 10.1016/j.jbmt.2017.01.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 01/03/2017] [Accepted: 01/04/2017] [Indexed: 01/17/2023]
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13
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Abstract
As life expectancy continues to rise worldwide, health concerns associated with advanced age are increasingly becoming prominent public health concerns. Among these concerns, nearly 30 years of discussion and research have yielded a wealth of information regarding the pathophysiology, biologic etiology, and clinical implications of age-related declines in skeletal muscle mass and function (i.e., sarcopenia). Recent years have yielded several debates surrounding both the definition and terminology of sarcopenia, yet many questions remain regarding interventions to treat the condition. Among major future challenges in the area will be to design and conduct high-quality clinical trials to ultimately provide new therapeutic strategies for the treatment of sarcopenia.
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Affiliation(s)
- Thomas W Buford
- 1 Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
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14
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Baptista LC, Machado-Rodrigues AM, Veríssimo MT, Martins RA. Exercise training improves functional status in hypertensive older adults under angiotensin converting enzymes inhibitors medication. Exp Gerontol 2017. [PMID: 28645696 DOI: 10.1016/j.exger.2017.06.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND The study aims to analyze the effect of three types of treatment on functional status, and cardiovascular risk outcomes in hypertensive older adults with comorbidities. METHODS Participants (n=418) underwent one of the following 3 conditions: i) multicomponent exercise training 3 times/week (MEX; n=116); ii) angiotensin converting enzyme inhibitors used mono-dose daily (ACEi; n=70); iii) combined exercise and ACEi drugs (ACEiMEX; n=232). The trial was completed by 82% of the participants (n=342): MEX (n=90); ACEi (n=66); ACEiMEX (n=186). Baseline and 2-year follow-up evaluations included the Senior Fitness Test battery, Short Form Health Survey 36 (SF-36), the health history questionnaires, anthropometric and hemodynamic profile. RESULTS MEX and ACEiMEX groups improved all physical functional status outcomes, decreased systolic (SBP) and diastolic blood pressure (p<0.001) and augmented the physical functioning, role physical and physical component score (PCS) (p<0.05), but also bodily pain (p<0.05). The ACEi group reduced the upper body strength, upper and lower body flexibility and aerobic endurance (p<0.05); worsened the anthropometric profile, and SBP (p<0.001); and decreased general health and PCS (p<0.05). CONCLUSIONS The improvement of the physical functioning and HRQoL in older hypertensive adults using ACEi medications only occur if they adopt an exercise training regimen, increasing also the management of the blood pressure and other cardiovascular risk factors.
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Affiliation(s)
| | | | | | - Raul A Martins
- Estádio Universitário de Coimbra, Pavilhão 3, 3000 Coimbra, Portugal.
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15
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Buford TW, Miller ME, Church TS, Gill TM, Henderson R, Hsu FC, McDermott MM, Nadkarni N, Pahor M, Stafford RS, Carter CS. Antihypertensive Use and the Effect of a Physical Activity Intervention in the Prevention of Major Mobility Disability Among Older Adults: The LIFE Study. J Gerontol A Biol Sci Med Sci 2016; 71:974-81. [PMID: 26865496 PMCID: PMC4906322 DOI: 10.1093/gerona/glv222] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 11/17/2015] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND This subgroup analysis of the Lifestyle Intervention and Independence for Elders trial evaluates the impact of a long-term physical activity (PA) intervention on rates of major mobility disability (MMD) among older adults according to their antihypertensive medication use. METHODS Lifestyle Intervention and Independence for Elders study participants were randomized to center-based PA or health education for a median of 2.7 years. Participants were sedentary men and women aged 70-89 years with objectively measured physical limitations. This analysis evaluated rates of MMD and persistent MMD among 1,633 participants, according to antihypertensive medication use. Participants were designated as either (i) an angiotensin-converting enzyme (ACE) inhibitor user (ACEi+), (ii) a user of other antihypertensives not including ACEi (ACEi-), or (iii) nonusers of antihypertensive medications (AHT-). Interactions were explored between antihypertensive use and randomized arm. RESULTS Interaction terms for MMD (p = .214) and persistent MMD (p = .180) did not reach statistical significance. For MMD, PA displayed marginal effects among ACEi+ (hazard ratio [HR] = 0.76; 95% confidence interval [CI] = 0.57, 1.02) and ACEi- (HR = 0.76; 95% CI = 0.60, 0.97) but not AHT- (HR = 1.19; 95% CI = 0.75, 1.87). For persistent MMD, the effect of PA was greatest among ACEi+ (HR = 0.57; 95% CI = 0.39, 0.84) when compared to ACEi- (HR = 0.76; 95% CI = 0.55, 1.06) or AHT- (HR = 1.18; 95% CI = 0.59, 2.36). CONCLUSIONS The effects of long-term PA on the incidence of MMD and persistent MMD were similar among three subgroups of older adults stratified by their antihypertensive medication use. However, though statistical interactions did not reach significance, several findings may warrant future study in other cohorts given the post hoc nature of this study.
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Affiliation(s)
- Thomas W Buford
- Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville.
| | - Michael E Miller
- Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Timothy S Church
- Preventive Medicine Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana
| | - Thomas M Gill
- Department of Internal Medicine, School of Medicine, Yale University, New Haven, Connecticut
| | - Rebecca Henderson
- Section on Gerontology and Geriatrics, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Fang-Chi Hsu
- Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Mary M McDermott
- Department of Medicine and Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Neelesh Nadkarni
- Department of Medicine, School of Medicine, University of Pittsburgh, Pennsylvania
| | - Marco Pahor
- Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville
| | - Randall S Stafford
- Stanford Prevention Research Center, School of Medicine, Stanford University, Palo Alto, California
| | - Christy S Carter
- Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville
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Abstract
Hypertension is a highly prevalent condition with numerous health risks, and the incidence of hypertension is greatest among older adults. Traditional discussions of hypertension have largely focused on the risks for cardiovascular disease and associated events. However, there are a number of collateral effects, including risks for dementia, physical disability, and falls/fractures which are increasingly garnering attention in the hypertension literature. Several key mechanisms--including inflammation, oxidative stress, and endothelial dysfunction--are common to biologic aging and hypertension development and appear to have key mechanistic roles in the development of the cardiovascular and collateral risks of late-life hypertension. The objective of the present review is to highlight the multi-dimensional risks of hypertension among older adults and discuss potential strategies for treatment and future areas of research for improving overall care for older adults with hypertension.
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17
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Costagliola A, Wojcik S, Pagano TB, De Biase D, Russo V, Iovane V, Grieco E, Papparella S, Paciello O. Age-Related Changes in Skeletal Muscle of Cattle. Vet Pathol 2016; 53:436-46. [PMID: 26869152 DOI: 10.1177/0300985815624495] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Sarcopenia, the age-related loss of muscle mass and strength, is a multifactorial condition that represents a major healthcare concern for the elderly population. Although its morphologic features have been extensively studied in humans, animal models, and domestic and wild animals, only a few reports about spontaneous sarcopenia exist in other long-lived animals. In this work, muscle samples from 60 healthy Podolica-breed old cows (aged 15-23 years) were examined and compared with muscle samples from 10 young cows (3-6 years old). Frozen sections were studied through standard histologic and histoenzymatic procedures, as well as by immunohistochemistry, immunofluorescence, and Western blot analysis. The most prominent age-related myopathic features seen in the studied material included angular fiber atrophy (90% of cases), mitochondrial alterations (ragged red fibers, 70%; COX-negative fibers, 60%), presence of vacuolated fibers (75%), lymphocytic (predominantly CD8+) inflammation (40%), and type II selective fiber atrophy (40%). Immunohistochemistry revealed increased expression of major histocompatibility complex I in 36 cases (60%) and sarcoplasmic accumulations of β-amyloid precursor protein-positive material in 18 cases (30%). In aged cows, muscle atrophy was associated with accumulation of myostatin. Western blot analysis indicated increased amount of both proteins-myostatin and β-amyloid precursor protein-in muscles of aged animals compared with controls. These findings confirm the presence of age-related morphologic changes in cows similar to human sarcopenia and underline the possible role of amyloid deposition and subsequent inflammation in muscle senescence.
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Affiliation(s)
- A Costagliola
- Department of Veterinary Medicine and Animal Production, University of Naples Federico II, Naples, Italy
| | - S Wojcik
- Department of Anatomy and Neurobiology, Medical University of Gdansk, Gdansk, Poland
| | - T B Pagano
- Department of Veterinary Medicine and Animal Production, University of Naples Federico II, Naples, Italy
| | - D De Biase
- Department of Veterinary Medicine and Animal Production, University of Naples Federico II, Naples, Italy
| | - V Russo
- Department of Veterinary Medicine and Animal Production, University of Naples Federico II, Naples, Italy
| | - V Iovane
- Department of Veterinary Medicine and Animal Production, University of Naples Federico II, Naples, Italy
| | - E Grieco
- Azienda Sanitaria Locale, Salerno, Italy
| | - S Papparella
- Department of Veterinary Medicine and Animal Production, University of Naples Federico II, Naples, Italy
| | - O Paciello
- Department of Veterinary Medicine and Animal Production, University of Naples Federico II, Naples, Italy
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18
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Anton SD, Woods AJ, Ashizawa T, Barb D, Buford TW, Carter CS, Clark DJ, Cohen RA, Corbett DB, Cruz-Almeida Y, Dotson V, Ebner N, Efron PA, Fillingim RB, Foster TC, Gundermann DM, Joseph AM, Karabetian C, Leeuwenburgh C, Manini TM, Marsiske M, Mankowski RT, Mutchie HL, Perri MG, Ranka S, Rashidi P, Sandesara B, Scarpace PJ, Sibille KT, Solberg LM, Someya S, Uphold C, Wohlgemuth S, Wu SS, Pahor M. Successful aging: Advancing the science of physical independence in older adults. Ageing Res Rev 2015; 24:304-27. [PMID: 26462882 DOI: 10.1016/j.arr.2015.09.005] [Citation(s) in RCA: 174] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Revised: 09/08/2015] [Accepted: 09/30/2015] [Indexed: 02/08/2023]
Abstract
The concept of 'successful aging' has long intrigued the scientific community. Despite this long-standing interest, a consensus definition has proven to be a difficult task, due to the inherent challenge involved in defining such a complex, multi-dimensional phenomenon. The lack of a clear set of defining characteristics for the construct of successful aging has made comparison of findings across studies difficult and has limited advances in aging research. A consensus on markers of successful aging is furthest developed is the domain of physical functioning. For example, walking speed appears to be an excellent surrogate marker of overall health and predicts the maintenance of physical independence, a cornerstone of successful aging. The purpose of the present article is to provide an overview and discussion of specific health conditions, behavioral factors, and biological mechanisms that mark declining mobility and physical function and promising interventions to counter these effects. With life expectancy continuing to increase in the United States and developed countries throughout the world, there is an increasing public health focus on the maintenance of physical independence among all older adults.
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19
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Abstract
Among individuals, biological aging leads to cellular and organismal dysfunction and an increased risk of chronic degenerative diseases and disability. This sequence of events in combination with the projected increases in the number of older adults will result in a worldwide healthcare burden with dire consequences. Superimposed on this setting are the adults now reaching traditional retirement ages--the baby boomers--a group that wishes to remain active, productive and physically and cognitively fit as they grow older. Together, these conditions are producing an unprecedented demand for increased healthspan or what might be termed “optimal longevity”—to live long, but well. To meet this demand, investigators with interests in the biological aspects of aging from model organisms to human epidemiology (population aging) must work together within an interactive process that we describe as translational geroscience. An essential goal of this new investigational platform should be the optimization and preservation of physiological function throughout the lifespan, including integrative physical and cognitive function, which would serve to increase healthspan, compress morbidity and disability into a shorter period of late-life, and help achieve optimal longevity. To most effectively utilize this new approach, we must rethink how investigators and administrators working at different levels of the translational research continuum communicate and collaborate with each other, how best to train the next generation of scientists in this new field, and how contemporary biological-biomedical aging research should be organized and funded.
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20
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Buford TW, Anton SD, Bavry AA, Carter CS, Daniels MJ, Pahor M. Multi-modal intervention to reduce cardiovascular risk among hypertensive older adults: Design of a randomized clinical trial. Contemp Clin Trials 2015; 43:237-42. [PMID: 26115878 DOI: 10.1016/j.cct.2015.06.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 06/16/2015] [Accepted: 06/20/2015] [Indexed: 01/13/2023]
Abstract
Persons aged over 65 years account for over 75% of healthcare expenditures and deaths attributable to cardiovascular disease (CVD). Accordingly, reducing CVD risk among older adults is an important public health priority. Functional status, determined by measures of physical performance, is an important predictor of cardiovascular outcomes in older adults and declines more rapidly in seniors with hypertension. To date, physical exercise is the primary strategy for attenuating declines in functional status. Yet despite the general benefits of training, exercise alone appears to be insufficient for preventing this decline. Thus, alternative or adjuvant strategies are needed to preserve functional status among seniors with hypertension. Prior data suggest that angiotensin converting enzyme inhibitors (ACEi) may be efficacious in enhancing exercise-derived improvements in functional status yet this hypothesis has not been tested in a randomized controlled trial. The objective of this randomized, double-masked pilot trial is to gather preliminary efficacy and safety data necessary for conducting a full-scale trial to test this hypothesis. Sedentary men and women ≥ 65 years of age with functional limitations and hypertension are being recruited into this 24 week intervention study. Participants are randomly assigned to one of three conditions: (1) ACEi plus exercise training, (2) thiazide diuretic plus exercise training, or (3) AT1 receptor antagonist plus exercise training. The primary outcome is change in walking speed and secondary outcomes consist of other indices of CV risk including exercise capacity, body composition, as well as circulating indices of metabolism, inflammation and oxidative stress.
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Affiliation(s)
- Thomas W Buford
- Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville, FL, United States; Department of Applied Physiology and Kinesiology, College of Health and Human Performance, University of Florida, Gainesville, FL, United States.
| | - Stephen D Anton
- Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville, FL, United States; Department of Clinical and Health Psychology, College of Public Health and Health Professions, University of Florida, Gainesville, FL, United States
| | - Anthony A Bavry
- Department of Medicine, College of Medicine, University of Florida, Gainesville, FL, United States; North Florida/South Georgia Veterans Health System, Gainesville, FL, United States
| | - Christy S Carter
- Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville, FL, United States
| | - Michael J Daniels
- Department of Statistics & Data Sciences and Department of Integrative Biology, College of Natural Sciences, University of Texas, Austin, TX, United States
| | - Marco Pahor
- Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville, FL, United States
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21
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Justice JN, Cesari M, Seals DR, Shively CA, Carter CS. Comparative Approaches to Understanding the Relation Between Aging and Physical Function. J Gerontol A Biol Sci Med Sci 2015; 71:1243-53. [PMID: 25910845 DOI: 10.1093/gerona/glv035] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 03/07/2015] [Indexed: 01/09/2023] Open
Abstract
Despite dedicated efforts to identify interventions to delay aging, most promising interventions yielding dramatic life-span extension in animal models of aging are often ineffective when translated to clinical trials. This may be due to differences in primary outcomes between species and difficulties in determining the optimal clinical trial paradigms for translation. Measures of physical function, including brief standardized testing batteries, are currently being proposed as biomarkers of aging in humans, are predictive of adverse health events, disability, and mortality, and are commonly used as functional outcomes for clinical trials. Motor outcomes are now being incorporated into preclinical testing, a positive step toward enhancing our ability to translate aging interventions to clinical trials. To further these efforts, we begin a discussion of physical function and disability assessment across species, with special emphasis on mice, rats, monkeys, and man. By understanding how physical function is assessed in humans, we can tailor measurements in animals to better model those outcomes to establish effective, standardized translational functional assessments with aging.
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Affiliation(s)
- Jamie N Justice
- Department of Integrative Physiology, University of Colorado Boulder.
| | - Matteo Cesari
- Gérontopôle, Centre Hospitalier Universitaire de Toulouse, Toulouse, France. INSERM UMR1207, Université de Toulouse III Paul Sabatier, Toulouse, France
| | - Douglas R Seals
- Department of Integrative Physiology, University of Colorado Boulder
| | - Carol A Shively
- Departments of Pathology Section on Comparative Medicine, Public Health Sciences and Sticht Center on Aging, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Christy S Carter
- Department of Aging and Geriatric Research, Institute on Aging, College of Medicine, University of Florida, Gainesville
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22
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Seals DR, Justice JN, LaRocca TJ. Physiological geroscience: targeting function to increase healthspan and achieve optimal longevity. J Physiol 2015; 594:2001-24. [PMID: 25639909 DOI: 10.1113/jphysiol.2014.282665] [Citation(s) in RCA: 178] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 01/27/2015] [Indexed: 12/17/2022] Open
Abstract
Most nations of the world are undergoing rapid and dramatic population ageing, which presents great socio-economic challenges, as well as opportunities, for individuals, families, governments and societies. The prevailing biomedical strategy for reducing the healthcare impact of population ageing has been 'compression of morbidity' and, more recently, to increase healthspan, both of which seek to extend the healthy period of life and delay the development of chronic diseases and disability until a brief period at the end of life. Indeed, a recently established field within biological ageing research, 'geroscience', is focused on healthspan extension. Superimposed on this background are new attitudes and demand for 'optimal longevity' - living long, but with good health and quality of life. A key obstacle to achieving optimal longevity is the progressive decline in physiological function that occurs with ageing, which causes functional limitations (e.g. reduced mobility) and increases the risk of chronic diseases, disability and mortality. Current efforts to increase healthspan centre on slowing the fundamental biological processes of ageing such as inflammation/oxidative stress, increased senescence, mitochondrial dysfunction, impaired proteostasis and reduced stress resistance. We propose that optimization of physiological function throughout the lifespan should be a major emphasis of any contemporary biomedical policy addressing global ageing. Effective strategies should delay, reduce in magnitude or abolish reductions in function with ageing (primary prevention) and/or improve function or slow further declines in older adults with already impaired function (secondary prevention). Healthy lifestyle practices featuring regular physical activity and ideal energy intake/diet composition represent first-line function-preserving strategies, with pharmacological agents, including existing and new pharmaceuticals and novel 'nutraceutical' compounds, serving as potential complementary approaches. Future research efforts should focus on defining the temporal patterns of functional declines with ageing, identifying the underlying mechanisms and modulatory factors involved, and establishing the most effective lifestyle practices and pharmacological options for maintaining function. Continuing development of effective behavioural approaches for enhancing adherence to healthy ageing practices in diverse populations, and ongoing analysis of the socio-economic costs and benefits of healthspan extension will be important supporting goals. To meet the demands created by rapid population ageing, a new emphasis in physiological geroscience is needed, which will require the collaborative, interdisciplinary efforts of investigators working throughout the translational research continuum from basic science to public health.
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Affiliation(s)
- Douglas R Seals
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, 80309, USA
| | - Jamie N Justice
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, 80309, USA
| | - Thomas J LaRocca
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, 80309, USA
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Simon CB, Lee-McMullen B, Phelan D, Gilkes J, Carter CS, Buford TW. The renin-angiotensin system and prevention of age-related functional decline: where are we now? AGE (DORDRECHT, NETHERLANDS) 2015; 37:9753. [PMID: 25663422 PMCID: PMC4320995 DOI: 10.1007/s11357-015-9753-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 01/27/2015] [Indexed: 05/19/2023]
Abstract
Declining physical function is a major health problem for older adults as it is associated with multiple comorbidities and mortality. Exercise has been shown to improve physical function, though response to exercise is variable. Conversely, drugs targeting the renin-angiotensin system (RAS) pathway, including angiotensin-converting enzyme inhibitors (ACEi) and angiotensin receptor blockers (ARBs), are also reported to improve physical function. In the past decade, significant strides have been made to understand the complexity and specificity of the RAS system as it pertains to physical function in older adults. Prior findings have also determined that interactions between antihypertensive medications and exercise may influence physical function above and beyond either factor alone. We review the latest research on RAS, exercise, and physical function for older adults. We also outline future research aims in this area, including genetic influences and clinical phenotyping, for the purpose of maintaining or improving physical function through tailored treatments.
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Affiliation(s)
- Corey B. Simon
- />Pain Research and Intervention Center of Excellence, University of Florida, Gainesville, FL USA
| | - Brittany Lee-McMullen
- />Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL USA
| | - Dane Phelan
- />Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL USA
| | - Janine Gilkes
- />Department of Medicine, College of Medicine, University of Florida, Gainesville, FL USA
| | - Christy S. Carter
- />Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville, FL USA
| | - Thomas W. Buford
- />Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville, FL USA
- />Department of Applied Physiology and Kinesiology, College of Health and Human Performance, University of Florida, Gainesville, FL USA
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Carter CS, Khamiss D, Matheny M, Toklu HZ, Kirichenko N, Strehler KYE, Tümer N, Scarpace PJ, Morgan D. Rapamycin Versus Intermittent Feeding: Dissociable Effects on Physiological and Behavioral Outcomes When Initiated Early and Late in Life. J Gerontol A Biol Sci Med Sci 2015; 71:866-75. [PMID: 25617380 DOI: 10.1093/gerona/glu238] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 11/22/2014] [Indexed: 12/31/2022] Open
Abstract
Rapamycin, an inhibitor of the mammalian target of rapamycin pathway, has been shown to increase mammalian life span; less is known concerning its effect on healthspan. The primary aim of this study was to examine rapamycin's role in the alteration of several physiological and behavioral outcomes compared with the healthspan-inducing effects of intermittent feeding (IF), another life-span-enhancing intervention. Male Fisher 344 × Brown Norway rats (6 and 25 months of age) were treated with rapamycin or IF for 5 weeks. IF and rapamycin reduced food consumption and body weight. Rapamycin increased relative lean mass and decreased fat mass. IF failed to alter fat mass but lowered relative lean mass. Behaviorally, rapamycin resulted in high activity levels in old animals, IF increased levels of "anxiety" for both ages, and grip strength was not significantly altered by either treatment. Rapamycin, not IF, decreased circulating leptin in older animals to the level of young animals. Glucose levels were unchanged with age or treatment. Hypothalamic AMPK and pAMPK levels decreased in both older treated groups. This pattern of results suggests that rapamycin has more selective and healthspan-inducing effects when initiated late in life.
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Affiliation(s)
| | | | - Michael Matheny
- Department of Pharmacology and Experimental Therapeutics, and
| | - Hale Z Toklu
- Department of Pharmacology and Experimental Therapeutics, and
| | | | | | - Nihal Tümer
- Department of Pharmacology and Experimental Therapeutics, and Department of Veterans Affairs Medical Center, Gainesville, Florida
| | | | - Drake Morgan
- Department of Psychiatry, University of Florida College of Medicine, Gainesville
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Sepehri A, Beggs T, Hassan A, Rigatto C, Shaw-Daigle C, Tangri N, Arora RC. The impact of frailty on outcomes after cardiac surgery: A systematic review. J Thorac Cardiovasc Surg 2014; 148:3110-7. [DOI: 10.1016/j.jtcvs.2014.07.087] [Citation(s) in RCA: 222] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 06/23/2014] [Accepted: 07/14/2014] [Indexed: 10/24/2022]
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Cesari M, Landi F, Vellas B, Bernabei R, Marzetti E. Sarcopenia and physical frailty: two sides of the same coin. Front Aging Neurosci 2014; 6:192. [PMID: 25120482 PMCID: PMC4112807 DOI: 10.3389/fnagi.2014.00192] [Citation(s) in RCA: 284] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 07/12/2014] [Indexed: 01/10/2023] Open
Affiliation(s)
- Matteo Cesari
- Gérontopôle, Centre Hospitalier Universitaire de Toulouse , Toulouse , France ; INSERM UMR1027, Université de Toulouse III Paul Sabatier , Toulouse , France
| | - Francesco Landi
- Centro Medicina dell'Invecchiamento, Università Cattolica del Sacro Cuore , Rome , Italy
| | - Bruno Vellas
- Gérontopôle, Centre Hospitalier Universitaire de Toulouse , Toulouse , France ; INSERM UMR1027, Université de Toulouse III Paul Sabatier , Toulouse , France
| | - Roberto Bernabei
- Centro Medicina dell'Invecchiamento, Università Cattolica del Sacro Cuore , Rome , Italy
| | - Emanuele Marzetti
- Centro Medicina dell'Invecchiamento, Università Cattolica del Sacro Cuore , Rome , Italy
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Justice JN, Carter CS, Beck HJ, Gioscia-Ryan RA, McQueen M, Enoka RM, Seals DR. Battery of behavioral tests in mice that models age-associated changes in human motor function. AGE (DORDRECHT, NETHERLANDS) 2014; 36:583-92. [PMID: 24122289 PMCID: PMC4039275 DOI: 10.1007/s11357-013-9589-9] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Accepted: 09/18/2013] [Indexed: 05/13/2023]
Abstract
Motor function in humans can be characterized with tests of locomotion, strength, balance, and endurance. The aim of our project was to establish an analogous test battery to assess motor function in mice. Male C57BL/6 mice were studied at 3 (n = 87), 20 (n = 48) and 26 (n = 43) months of age. Tests assessed locomotion, strength, balance/coordination, and endurance capacity in mice. Motor function was reduced in the older groups of mice for the locomotion, strength, and endurance subdomains (p < 0.001). As indicated with a summary score, motor function declined by 7.4 % from 3 to 20 months and by 13.5 % from 20 to 26 months. Based on comparison with previously published data in humans, the magnitude and relative time course of changes were similar in mice and humans in each subdomain except balance/coordination. Power calculations confirmed that the age-associated differences depicted by several of the individual tests and domain summary scores would be sufficient to assess the efficacy of interventions aimed at prevention or treatment of motor dysfunction with aging. The current study describes a mouse model that characterizes age-associated changes in clinically relevant domains of motor function and indicates that the preclinical model can be used to test strategies to attenuate age-associated declines in motor function.
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Affiliation(s)
- Jamie N. Justice
- />Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, 1725 Pleasant Street, Boulder, CO 80309-0354 USA
| | - Christy S. Carter
- />Department of Aging and Geriatric Research, Institute on Aging, College of Medicine, University of Florida, Gainesville, FL 32610 USA
| | - Hannah J. Beck
- />Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, 1725 Pleasant Street, Boulder, CO 80309-0354 USA
| | - Rachel A. Gioscia-Ryan
- />Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, 1725 Pleasant Street, Boulder, CO 80309-0354 USA
| | - Matthew McQueen
- />Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, 1725 Pleasant Street, Boulder, CO 80309-0354 USA
| | - Roger M. Enoka
- />Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, 1725 Pleasant Street, Boulder, CO 80309-0354 USA
| | - Douglas R. Seals
- />Department of Integrative Physiology, University of Colorado Boulder, 354 UCB, 1725 Pleasant Street, Boulder, CO 80309-0354 USA
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Optimizing the benefits of exercise on physical function in older adults. PM R 2013; 6:528-43. [PMID: 24361365 DOI: 10.1016/j.pmrj.2013.11.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2013] [Revised: 11/13/2013] [Accepted: 11/14/2013] [Indexed: 01/10/2023]
Abstract
As the number of older adults continues to rise worldwide, the prevention of physical disability among seniors is an increasingly important public health priority. Physical exercise is among the best known methods of preventing disability, but accumulating evidence indicates that considerable variability exists in the responsiveness of older adults to standard training regimens. Accordingly, a need exists to develop tailored interventions to optimize the beneficial effects of exercise on the physical function of older adults at risk for becoming disabled. The present review summarizes the available literature related to the use of adjuvant or alternative strategies intended to enhance the efficacy of exercise in improving the physical function of older adults. Within this work, we also discuss potential future research directions in this area.
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Abstract
The early 21st century has witnessed a steady push by scientists, industry leaders, and government officials to make medicine more personalized. To date, the concept of personalized medicine has referred largely to the field of pharmacogenomics. In contrast, relatively few data exist regarding the application of preventive strategies such as physical exercise in the context of personalized medicine. Within this review, we highlight the extant literature and propose five strategies for scientists that may propel the exercise and sports science fields toward this global goal. Notably, these approaches are in addition to methods to maintain adherence to training - a well-known factor in determining exercise responsiveness. Briefly, these strategies include (1) evaluating participant responses to training at the individual as well as group level; (2) identifying sources of variability in responsiveness to training; (3) optimizing exercise dosing strategies to maximize benefits while minimizing barriers to participation; (4) evaluating the efficacy of multimodal interventions for relevant population subgroups; and (5) increasing the clinical relevance of study populations and outcomes in exercise trials. We look forward to seeing these strategies considered in trials of preventive health interventions such as exercise. Extensive future research in this area is needed for the vision of exercise as a personalized form of medicine to become a reality.
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Affiliation(s)
- Thomas W Buford
- Department of Aging and Geriatric Research, College of Medicine, University of Florida, PO Box 112610, Gainesville, FL 32611, USA.
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Guo W, Wong S, Li M, Liang W, Liesa M, Serra C, Jasuja R, Bartke A, Kirkland JL, Shirihai O, Bhasin S. Testosterone plus low-intensity physical training in late life improves functional performance, skeletal muscle mitochondrial biogenesis, and mitochondrial quality control in male mice. PLoS One 2012; 7:e51180. [PMID: 23240002 PMCID: PMC3519841 DOI: 10.1371/journal.pone.0051180] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Accepted: 10/29/2012] [Indexed: 01/28/2023] Open
Abstract
Testosterone supplementation increases muscle mass in older men but has not been shown to consistently improve physical function and activity. It has been hypothesized that physical exercise is required to induce the adaptations necessary for translation of testosterone-induced muscle mass gain into functional improvements. However, the effects of testosterone plus low intensity physical exercise training (T/PT) on functional performance and bioenergetics are unknown. In this pilot study, we tested the hypothesis that combined administration of T/PT would improve functional performance and bioenergetics in male mice late in life more than low-intensity physical training alone. 28-month old male mice were randomized to receive T/PT or vehicle plus physical training (V/PT) for 2 months. Compare to V/PT control, administration of T/PT was associated with improvements in muscle mass, grip strength, spontaneous physical movements, and respiratory activity. These changes were correlated with increased mitochondrial DNA copy number and expression of markers for mitochondrial biogenesis. Mice receiving T/PT also displayed increased expression of key elements for mitochondrial quality control, including markers for mitochondrial fission-and-fusion and mitophagy. Concurrently, mice receiving T/PT also displayed increased expression of markers for reduced tissue oxidative damage and improved muscle quality. Conclusion: Testosterone administered with low-intensity physical training improves grip strength, spontaneous movements, and respiratory activity. These functional improvements were associated with increased muscle mitochondrial biogenesis and improved mitochondrial quality control.
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Affiliation(s)
- Wen Guo
- Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, United States of America.
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31
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Current world literature. Curr Opin Rheumatol 2012; 24:694-702. [PMID: 23018859 DOI: 10.1097/bor.0b013e328359ee5b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Mercken EM, Carboneau BA, Krzysik-Walker SM, de Cabo R. Of mice and men: the benefits of caloric restriction, exercise, and mimetics. Ageing Res Rev 2012; 11:390-8. [PMID: 22210414 DOI: 10.1016/j.arr.2011.11.005] [Citation(s) in RCA: 217] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Revised: 11/09/2011] [Accepted: 11/18/2011] [Indexed: 12/25/2022]
Abstract
During aging there is an increasing imbalance of energy intake and expenditure resulting in obesity, frailty, and metabolic disorders. For decades, research has shown that caloric restriction (CR) and exercise can postpone detrimental aspects of aging. These two interventions invoke a similar physiological signature involving pathways associated with stress responses and mitochondrial homeostasis. Nonetheless, CR is able to delay aging processes that result in an increase of both mean and maximum lifespan, whereas exercise primarily increases healthspan. Due to the strict dietary regime necessary to achieve the beneficial effects of CR, most studies to date have focused on rodents and non-human primates. As a consequence, there is vast interest in the development of compounds such as resveratrol, metformin and rapamycin that would activate the same metabolic- and stress-response pathways induced by these interventions without actually restricting caloric intake. Therefore the scope of this review is to (i) describe the benefits of CR and exercise in healthy individuals, (ii) discuss the role of these interventions in the diseased state, and (iii) examine some of the promising pharmacological alternatives such as CR- and exercise-mimetics.
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Buford TW, Manini TM, Hsu FC, Cesari M, Anton SD, Nayfield S, Stafford RS, Church TS, Pahor M, Carter CS. Angiotensin-converting enzyme inhibitor use by older adults is associated with greater functional responses to exercise. J Am Geriatr Soc 2012; 60:1244-52. [PMID: 22726232 DOI: 10.1111/j.1532-5415.2012.04045.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVES To assess the association between angiotensin converting enzyme inhibitors (ACEis) and improvements in the physical function of older adults in response to chronic exercise training. DESIGN Secondary analysis of the Lifestyle Interventions and Independence for Elders Pilot (LIFE-P) study, a multisite randomized clinical trial to evaluate the effects of chronic exercise on the physical function of older adults at risk for mobility disability. SETTING Four academic research centers within the United States. PARTICIPANTS Four hundred twenty-four individuals aged 70 to 89 with mild to moderate functional impairments categorized for this analysis as ACEi users, users of other antihypertensive drugs, or antihypertensive nonusers. INTERVENTION A 12-month intervention of structured physical activity (PA) or health education promoting successful aging (SA). MEASUREMENTS Change in walking speed during a 400-m test and performance on a battery of short-duration mobility tasks (Short Physical Performance Battery (SPPB)). RESULTS Physical activity significantly improved the adjusted walking speed of ACEi users (P < .001) but did not of nonusers. PA improved the adjusted SPPB score of ACEi users (P < .001) and of persons who used other antihypertensive drugs (P = .005) but not of antihypertensive nonusers (P = .91).The percentage of ACEi users deriving clinically significant benefit from exercise training for walking speed (30%) and SPPB score (48%) was dramatically higher than for nonusers (14% and 12%, respectively). CONCLUSION For older adults at risk for disability, exercise-derived improvements in physical function were greater for ACEi users than users of other antihypertensive drugs and antihypertensive nonusers.
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Affiliation(s)
- Thomas W Buford
- Department of Aging and Geriatric Research, University of Florida College of Medicine, Gainesville, Florida 32607, USA.
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Serra C, Tangherlini F, Rudy S, Lee D, Toraldo G, Sandor NL, Zhang A, Jasuja R, Bhasin S. Testosterone improves the regeneration of old and young mouse skeletal muscle. J Gerontol A Biol Sci Med Sci 2012; 68:17-26. [PMID: 22499765 DOI: 10.1093/gerona/gls083] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Aging is associated with loss of muscle mass and strength, reduced satellite cell number, and lower regenerative potential. Testosterone increases muscle mass, strength, and satellite cell number in humans; however, the effects of testosterone on the regenerative potential of skeletal muscle are unclear. Here, we investigated the effect of testosterone on the skeletal muscle regeneration of young (2-month-old) and aged (24-month-old) male mice. We show that testosterone increases the number of proliferating satellite cells in regenerating "tibialis anterior" muscle of young and aged castrated mice 2 and 4 days postinjury. Testosterone supplementation increases the number and the cross-sectional area of regenerating fibers in both classes of age 4 days postinjury. Testosterone increases satellite cell activation and proliferation and the regeneration of both young and aged mouse muscle. These data suggest prospective application of androgens to improve the regenerating potential of the aged human skeletal muscle.
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Affiliation(s)
- Carlo Serra
- Section of Endocrinology, Diabetes, and Nutrition, Boston Medical Center, Boston, MA 02118, USA.
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