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Cisterna B, Malatesta M. Molecular and Structural Alterations of Skeletal Muscle Tissue Nuclei during Aging. Int J Mol Sci 2024; 25:1833. [PMID: 38339110 PMCID: PMC10855217 DOI: 10.3390/ijms25031833] [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: 12/27/2023] [Revised: 01/30/2024] [Accepted: 01/31/2024] [Indexed: 02/12/2024] Open
Abstract
Aging is accompanied by a progressive loss of skeletal muscle mass and strength. The mechanisms underlying this phenomenon are certainly multifactorial and still remain to be fully elucidated. Changes in the cell nucleus structure and function have been considered among the possible contributing causes. This review offers an overview of the current knowledge on skeletal muscle nuclei in aging, focusing on the impairment of nuclear pathways potentially involved in age-related muscle decline. In skeletal muscle two types of cells are present: fiber cells, constituting the contractile muscle mass and containing hundreds of myonuclei, and the satellite cells, i.e., the myogenic mononuclear stem cells occurring at the periphery of the fibers and responsible for muscle growth and repair. Research conducted on different experimental models and with different methodological approaches demonstrated that both the myonuclei and satellite cell nuclei of aged skeletal muscles undergo several structural and molecular alterations, affecting chromatin organization, gene expression, and transcriptional and post-transcriptional activities. These alterations play a key role in the impairment of muscle fiber homeostasis and regeneration, thus contributing to the age-related decrease in skeletal muscle mass and function.
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Affiliation(s)
| | - Manuela Malatesta
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Strada Le Grazie 8, 37134 Verona, Italy;
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2
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Habiballa L, Hruby A, Granic A, Dodds RM, Hillman SJ, Jurk D, Passos JF, Sayer AA. Determining the feasibility of characterising cellular senescence in human skeletal muscle and exploring associations with muscle morphology and physical function at different ages: findings from the MASS_Lifecourse Study. GeroScience 2024; 46:1141-1158. [PMID: 37434081 PMCID: PMC10828484 DOI: 10.1007/s11357-023-00869-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 07/05/2023] [Indexed: 07/13/2023] Open
Abstract
Cellular senescence may be associated with morphological changes in skeletal muscle and changes in physical function with age although there have been few human studies. We aimed to determine the feasibility of characterising cellular senescence in skeletal muscle and explored sex-specific associations between markers of cellular senescence, muscle morphology, and physical function in participants from the MASS_Lifecourse Study. Senescence markers (p16, TAF (Telomere-Associated DNA Damage Foci), HMGB1 (High Mobility Group Box 1), and Lamin B1) and morphological characteristics (fibre size, number, fibrosis, and centrally nucleated fibres) were assessed in muscle biopsies from 40 men and women (age range 47-84) using spatially-resolved methods (immunohistochemistry, immunofluorescence, and RNA and fluorescence in situ hybridisation). The associations between senescence, morphology, and physical function (muscle strength, mass, and physical performance) at different ages were explored. We found that most senescence markers and morphological characteristics were weakly associated with age in men but more strongly, although non-significantly, associated with age in women. Associations between senescence markers, morphology, and physical function were also stronger in women for HMGB1 and grip strength (r = 0.52); TAF, BMI, and muscle mass (r > 0.4); Lamin B1 and fibrosis (r = - 0.5); fibre size and muscle mass (r ≥ 0.4); and gait speed (r = - 0.5). However, these associations were non-significant. In conclusion, we have demonstrated that it is feasible to characterise cellular senescence in human skeletal muscle and to explore associations with morphology and physical function in women and men of different ages. The findings require replication in larger studies.
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Affiliation(s)
- Leena Habiballa
- AGE Research Group, Faculty of Medical Sciences, Translational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, UK
- NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
- Social Genetic and Developmental Psychiatry Centre, Institute of Psychiatry Psychology and Neuroscience, King's College London, London, UK
| | - Adam Hruby
- Robert and Arlene Kogod Center On Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
- University of Southern California, Los Angeles, CA, USA
| | - Antoneta Granic
- AGE Research Group, Faculty of Medical Sciences, Translational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, UK.
- NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK.
| | - Richard M Dodds
- AGE Research Group, Faculty of Medical Sciences, Translational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, UK
- NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Susan J Hillman
- AGE Research Group, Faculty of Medical Sciences, Translational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, UK
- NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Diana Jurk
- Robert and Arlene Kogod Center On Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - João F Passos
- Robert and Arlene Kogod Center On Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - Avan A Sayer
- AGE Research Group, Faculty of Medical Sciences, Translational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, UK
- NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
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3
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Marcotte GR, Miller MJ, Kunz HE, Ryan ZC, Strub MD, Vanderboom PM, Heppelmann CJ, Chau S, Von Ruff ZD, Kilroe SP, McKeen AT, Dierdorff JM, Stern JI, Nath KA, Grueter CE, Lira VA, Judge AR, Rasmussen BB, Nair KS, Lanza IR, Ebert SM, Adams CM. GADD45A is a mediator of mitochondrial loss, atrophy, and weakness in skeletal muscle. JCI Insight 2023; 8:e171772. [PMID: 37815864 PMCID: PMC10721312 DOI: 10.1172/jci.insight.171772] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 10/05/2023] [Indexed: 10/12/2023] Open
Abstract
Aging and many illnesses and injuries impair skeletal muscle mass and function, but the molecular mechanisms are not well understood. To better understand the mechanisms, we generated and studied transgenic mice with skeletal muscle-specific expression of growth arrest and DNA damage inducible α (GADD45A), a signaling protein whose expression in skeletal muscle rises during aging and a wide range of illnesses and injuries. We found that GADD45A induced several cellular changes that are characteristic of skeletal muscle atrophy, including a reduction in skeletal muscle mitochondria and oxidative capacity, selective atrophy of glycolytic muscle fibers, and paradoxical expression of oxidative myosin heavy chains despite mitochondrial loss. These cellular changes were at least partly mediated by MAP kinase kinase kinase 4, a protein kinase that is directly activated by GADD45A. By inducing these changes, GADD45A decreased the mass of muscles that are enriched in glycolytic fibers, and it impaired strength, specific force, and endurance exercise capacity. Furthermore, as predicted by data from mouse models, we found that GADD45A expression in skeletal muscle was associated with muscle weakness in humans. Collectively, these findings identify GADD45A as a mediator of mitochondrial loss, atrophy, and weakness in mouse skeletal muscle and a potential target for muscle weakness in humans.
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Affiliation(s)
- George R. Marcotte
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
- University of Iowa, Iowa City, Iowa, USA
| | - Matthew J. Miller
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
- University of Iowa, Iowa City, Iowa, USA
| | - Hawley E. Kunz
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Zachary C. Ryan
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Matthew D. Strub
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Patrick M. Vanderboom
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Carrie J. Heppelmann
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Sarah Chau
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | | | - Sean P. Kilroe
- University of Texas Medical Branch, Galveston, Texas, USA
| | - Andrew T. McKeen
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
- University of Iowa, Iowa City, Iowa, USA
| | | | | | - Karl A. Nath
- Division of Nephrology and Hypertension, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | | | | | - Andrew R. Judge
- University of Florida, Gainesville, Florida, USA
- Emmyon, Inc., Rochester, Minnesota, USA
| | - Blake B. Rasmussen
- University of Texas Medical Branch, Galveston, Texas, USA
- Emmyon, Inc., Rochester, Minnesota, USA
- University of Texas Health Science Center, San Antonio, Texas, USA
| | - K. Sreekumaran Nair
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Ian R. Lanza
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Scott M. Ebert
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
- Emmyon, Inc., Rochester, Minnesota, USA
| | - Christopher M. Adams
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
- Emmyon, Inc., Rochester, Minnesota, USA
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Matsumoto C, Sekine H, Zhang N, Mogami S, Fujitsuka N, Takeda H. Role of p53 in Cisplatin-Induced Myotube Atrophy. Int J Mol Sci 2023; 24:ijms24119176. [PMID: 37298128 DOI: 10.3390/ijms24119176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 05/21/2023] [Accepted: 05/22/2023] [Indexed: 06/12/2023] Open
Abstract
Chemotherapy-induced sarcopenia is an unfavorable prognostic factor implicated in the development of postoperative complications and reduces the quality of life of patients with cancer. Skeletal muscle loss due to cisplatin use is caused by mitochondrial dysfunction and activation of muscle-specific ubiquitin ligases Atrogin-1 and muscle RING finger 1 (MuRF1). Although animal studies suggest the involvement of p53 in age-, immobility-, and denervation-related muscle atrophy, the association between cisplatin-induced atrophy and p53 remains unknown. Herein, we investigated the effect of a p53-specific inhibitor, pifithrin-alpha (PFT-α), on cisplatin-induced atrophy in C2C12 myotubes. Cisplatin increased the protein levels of p53, phosphorylated p53, and upregulated the mRNA expression of p53 target genes PUMA and p21 in C2C12 myotubes. PFT-α ameliorated the increase in intracellular reactive oxygen species production and mitochondrial dysfunction, and also reduced the cisplatin-induced increase in the Bax/Bcl-2 ratio. Although PFT-α also reduced the cisplatin-induced increase in MuRF1 and Atrogin-1 gene expression, it did not ameliorate the decrease in myosin heavy chain mRNA and protein levels and muscle-specific actin and myoglobin protein levels. We conclude that cisplatin increases muscle degradation in C2C12 myotubes in a p53-dependent manner, but p53 has minimal involvement in the reduction of muscle protein synthesis.
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Affiliation(s)
- Chinami Matsumoto
- Tsumura Kampo Research Laboratories, Tsumura & Co., 3586 Yoshiwara, Ami-machi, Inashiki-gun 300-1192, Japan
| | - Hitomi Sekine
- Tsumura Kampo Research Laboratories, Tsumura & Co., 3586 Yoshiwara, Ami-machi, Inashiki-gun 300-1192, Japan
| | - Nana Zhang
- Tsumura Kampo Research Laboratories, Tsumura & Co., 3586 Yoshiwara, Ami-machi, Inashiki-gun 300-1192, Japan
| | - Sachiko Mogami
- Tsumura Kampo Research Laboratories, Tsumura & Co., 3586 Yoshiwara, Ami-machi, Inashiki-gun 300-1192, Japan
| | - Naoki Fujitsuka
- Tsumura Kampo Research Laboratories, Tsumura & Co., 3586 Yoshiwara, Ami-machi, Inashiki-gun 300-1192, Japan
| | - Hiroshi Takeda
- Gastroenterology, Tokeidai Memorial Hospital, 2-3 North-1, East 1, Chuo-ku, Sapporo 060-0031, Japan
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita 12, Nishi 6, Kita-ku, Sapporo 060-0812, Japan
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A cross-talk between sestrins, chronic inflammation and cellular senescence governs the development of age-associated sarcopenia and obesity. Ageing Res Rev 2023; 86:101852. [PMID: 36642190 DOI: 10.1016/j.arr.2023.101852] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 12/20/2022] [Accepted: 01/10/2023] [Indexed: 01/15/2023]
Abstract
The rapid increase in both the lifespan and proportion of older adults is accompanied by the unprecedented rise in age-associated chronic diseases, including sarcopenia and obesity. Aging is also manifested by increased susceptibility to multiple endogenous and exogenous stresses enabling such chronic conditions to develop. Among the main physiological regulators of cellular adaption to various stress stimuli, such as DNA damage, hypoxia, and oxidative stress, are sestrins (Sesns), a family of three evolutionarily conserved proteins, Sesn1, 2, and 3. Age-associated sarcopenia and obesity are characterized by two key processes: (i) accumulation of senescent cells in the skeletal muscle and adipose tissue and (ii) creation of a systemic, chronic, low-grade inflammation (SCLGI). Presumably, failed SCLGI resolution governs the development of these chronic conditions. Noteworthy, Sesns activate senolytics, which are agents that selectively eliminate senescent cells, as well as specialized pro-resolving mediators, which are factors that physiologically provide inflammation resolution. Sesns reveal clear beneficial effects in pre-clinical models of sarcopenia and obesity. Based on these observations, we propose a novel treatment strategy for age-associated sarcopenia and obesity, complementary to the conventional therapeutic modalities: Sesn activation, SCLGI resolution, and senescent cell elimination.
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6
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Is the anti-aging effect of ACE2 due to its role in the renin-angiotensin system?-Findings from a comparison of the aging phenotypes of ACE2-deficient, Tsukuba hypertensive, and Mas-deficient mice. Hypertens Res 2023; 46:1210-1220. [PMID: 36788301 PMCID: PMC9925940 DOI: 10.1038/s41440-023-01189-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 12/17/2022] [Accepted: 12/21/2022] [Indexed: 02/16/2023]
Abstract
Angiotensin converting enzyme 2 (ACE2) functions as an enzyme that produces angiotensin 1-7 (A1-7) from angiotensin II (AII) in the renin-angiotensin system (RAS). We evaluated aging phenotypes, especially skeletal muscle aging, in ACE2 systemically deficient (ACE2 KO) mice and found that ACE2 has an antiaging function. The characteristic aging phenotype observed in ACE2 KO mice was not reproduced in mice deficient in the A1-7 receptor Mas or in Tsukuba hypertensive mice, a model of chronic AII overproduction, suggesting that ACE2 has a RAS-independent antiaging function. In this review, the results we have obtained and related studies on the aging regulatory mechanism mediated by RAS components will be presented and summarized. We evaluated the aging phenotype of ACE2 systemically deficient (ACE2 KO) mice, particularly skeletal muscle aging, and found that ACE2 has an antiaging function. The characteristic aging phenotype observed in ACE2 KO mice was not reproduced in Mas KO mice, angiotensin 1-7 receptor-deficient mice or in Tsukuba hypertensive mice, a model of chronic angiotensin II overproduction, suggesting that the antiaging functions of ACE2 are independent of the renin-angiotensin system (RAS).
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Ashton KJ, Kiessling CJ, Thompson JLM, Aziz AY, Thomas WG, Headrick JP, Reichelt ME. Early cardiac aging linked to impaired stress-resistance and transcriptional control of stress response, quality control and mitochondrial pathways. Exp Gerontol 2023; 171:112011. [PMID: 36347360 DOI: 10.1016/j.exger.2022.112011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 10/18/2022] [Accepted: 10/30/2022] [Indexed: 11/06/2022]
Abstract
Phenotypic and transcriptomic evidence of early cardiac aging, and associated mechanisms, were investigated in young to middle-aged male mice (C57Bl/6; ages 8, 16, 32, 48 wks). Left ventricular gene expression (profiled via Illumina MouseWG-6 BeadChips), contractile and coronary function, and stress-resistance were assessed in Langendorff perfused hearts under normoxic conditions and following ischemic insult (20 min global ischemia-45 min reperfusion; I-R). Baseline or normoxic contractile function was unaltered by age, while cardiac and coronary 'reserves' (during β-adrenoceptor stimulation; 1 μM isoproterenol) declined by 48 wks. Resistance to I-R injury fell from 16 to 32 wks. Age-dependent transcriptional changes In un-stressed hearts were limited to 104 genes (>1.3-fold; 0.05 FDR), supporting: up-regulated innate defenses (glutathione and xenobiotic metabolism, chemotaxis, interleukins) and catecholamine secretion; and down-regulated extracellular matrix (ECM), growth factor and survival (PI3K/Akt) signaling. In stressed (post-ischemic) myocardium, ∼15-times as many genes (1528) were age-dependent, grouped into 6 clusters (>1.3-fold change; 0.05 FDR): most changing from 16 wks (45 % up/44 % down), a further 5 % declining from 32 wks. Major age-dependent Biological Processes in I-R hearts reveal: declining ATP metabolism, oxidative phosphorylation, cardiac contraction and morphogenesis, phospholipid metabolism and calcineurin signaling; increasing proteolysis and negative control of MAPK; and mixed changes in nuclear transport and angiogenic genes. Pathway analysis supports reductions in: autophagy, stress response, ER protein processing, mRNA surveillance and ribosome/translation genes; with later falls in mitochondrial biogenesis, oxidative phosphorylation and proteasome genes in I-R hearts. Summarizing, early cardiac aging is evident from 16 to 32 wks in male mice, characterized by: declining cardiovascular reserve and stress-resistance, transcriptomic evidence of constitutive stress and altered catecholamine and survival/growth signaling in healthy hearts; and declining stress response, quality control, mitochondrial energy metabolism and cardiac modeling processes in stressed hearts. These very early changes, potentially key substrate for advanced aging, may inform approaches to healthy aging and cardioprotection in the adult heart.
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Affiliation(s)
- Kevin J Ashton
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD, Australia
| | - Can J Kiessling
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD, Australia
| | - Jamie-Lee M Thompson
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD, Australia
| | - Aliah Y Aziz
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD, Australia
| | - Walter G Thomas
- School of Biomedical Sciences, University of Queensland, Brisbane, QLD, Australia
| | - John P Headrick
- School of Medical Science, Griffith University, Southport, QLD, Australia
| | - Melissa E Reichelt
- School of Biomedical Sciences, University of Queensland, Brisbane, QLD, Australia.
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8
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Surugiu R, Burdusel D, Ruscu MA, Cercel A, Hermann DM, Cadenas IF, Popa-Wagner A. Clinical Ageing. Subcell Biochem 2023; 103:437-458. [PMID: 37120476 DOI: 10.1007/978-3-031-26576-1_16] [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: 05/01/2023]
Abstract
Ageing is generally characterised by the declining ability to respond to stress, increasing homeostatic imbalance, and increased risk of ageing-associated diseases . Mechanistically, the lifelong accumulation of a wide range of molecular and cellular impairments leads to organismal senescence. The aging population poses a severe medical concern due to the burden it places on healthcare systems and the general public as well as the prevalence of diseases and impairments associated with old age. In this chapter, we discuss organ failure during ageing as well as ageing of the hypothalamic-pituitary-adrenal axis and drugs that can regulate it. A much-debated subject is about ageing and regeneration. With age, there is a gradual decline in the regenerative properties of most tissues. The goal of regenerative medicine is to restore cells, tissues, and structures that are lost or damaged after disease, injury, or ageing. The question arises as to whether this is due to the intrinsic ageing of stem cells or, rather, to the impairment of stem-cell function in the aged tissue environment. The risk of having a stroke event doubles each decade after the age of 55. Therefore, it is of great interest to develop neurorestorative therapies for stroke which occurs mostly in elderly people. Initial enthusiasm for stimulating restorative processes in the ischaemic brain with cell-based therapies has meanwhile converted into a more balanced view, recognising impediments related to survival, migration, differentiation, and integration of therapeutic cells in the hostile aged brain environment. Therefore, a current lack of understanding of the fate of transplanted cells means that the safety of cell therapy in stroke patients is still unproven. Another issue associated with ischaemic stroke is that patients at risk for these sequels of stroke are not duly diagnosed and treated due to the lack of reliable biomarkers. However, recently neurovascular unit-derived exosomes in response to Stroke and released into serum are new plasma genetic and proteomic biomarkers associated with ischaemic stroke. The second valid option, which is also more economical, is to invest in prevention.
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Affiliation(s)
- Roxana Surugiu
- Experimental Research Centre for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania
- University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Daiana Burdusel
- Experimental Research Centre for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania
- University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Mihai-Andrei Ruscu
- Experimental Research Centre for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Andreea Cercel
- Stroke Pharmacogenomics and Genetics Group, Sant Pau Hospital Institute of Research, Barcelona, Spain
| | - Dirk M Hermann
- Experimental Research Centre for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania
- University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Israel Fernandez Cadenas
- Stroke Pharmacogenomics and Genetics Group, Sant Pau Hospital Institute of Research, Barcelona, Spain
| | - Aurel Popa-Wagner
- Experimental Research Centre for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania.
- University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
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9
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Symonenko AV, Roshina NV, Krementsova AV, Rybina OY, Pasyukova EG. Shuttle craft Gene Affects Lifespan of Drosophila melanogaster by Controlling Early Development and Modifying Aging Program. BIOCHEMISTRY. BIOKHIMIIA 2022; 87:1611-1621. [PMID: 36717450 DOI: 10.1134/s0006297922120161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Fundamental mechanisms underlying genetic control of lifespan are intensively studied and discussed due to the increasing importance of extending healthy human life. The stc gene of the model organism Drosophila melanogaster encodes a transcription factor, homolog of the human transcription factor NF-X1, involved in regulation of neuronal development and other processes, as well as in control of lifespan. In this work, we demonstrate that the stc knockdown in embryonic and nerve cells leads to changes in lifespan, with the nature of changes depending on the cell type and sex of individuals. Based on our results, we suggest that stc gene is involved in transcription regulation throughout life, and, as a result, also affects a complex integral trait, lifespan. At the same time, we show that the reduction of stc expression in neurons can alleviate the negative effect of glutamate on longevity, possibly preventing development of glutamate excitotoxicity, thus modifying the cell death program and preventing death of individuals due to phenoptosis.
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Affiliation(s)
- Alexander V Symonenko
- Institute of Molecular Genetics, National Research Center "Kurchatov Institute", Moscow, 123182, Russia
| | - Natalia V Roshina
- Institute of Molecular Genetics, National Research Center "Kurchatov Institute", Moscow, 123182, Russia.,Vavilov Institute of General Genetics, Russian Academy of Sciences, 11999 Moscow, Russia
| | - Anna V Krementsova
- Institute of Molecular Genetics, National Research Center "Kurchatov Institute", Moscow, 123182, Russia.,Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, 119334, Russia
| | - Olga Y Rybina
- Institute of Molecular Genetics, National Research Center "Kurchatov Institute", Moscow, 123182, Russia.,Moscow Pedagogical State University, Moscow, 119991, Russia
| | - Elena G Pasyukova
- Institute of Molecular Genetics, National Research Center "Kurchatov Institute", Moscow, 123182, Russia.
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10
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Zhang X, Habiballa L, Aversa Z, Ng YE, Sakamoto AE, Englund DA, Pearsall VM, White TA, Robinson MM, Rivas DA, Dasari S, Hruby AJ, Lagnado AB, Jachim SK, Granic A, Sayer AA, Jurk D, Lanza IR, Khosla S, Fielding RA, Nair KS, Schafer MJ, Passos JF, LeBrasseur NK. Characterization of cellular senescence in aging skeletal muscle. NATURE AGING 2022; 2:601-615. [PMID: 36147777 PMCID: PMC9491365 DOI: 10.1038/s43587-022-00250-8] [Citation(s) in RCA: 64] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 06/08/2022] [Indexed: 01/10/2023]
Abstract
Senescence is a cell fate that contributes to multiple aging-related pathologies. Despite profound age-associated changes in skeletal muscle (SkM), whether its constituent cells are prone to senesce has not been methodically examined. Herein, using single cell and bulk RNA-sequencing and complementary imaging methods on SkM of young and old mice, we demonstrate that a subpopulation of old fibroadipogenic progenitors highly expresses p16 Ink4a together with multiple senescence-related genes and, concomitantly, exhibits DNA damage and chromatin reorganization. Through analysis of isolated myofibers, we also detail a senescence phenotype within a subset of old cells, governed instead by p2 Cip1 . Administration of a senotherapeutic intervention to old mice countered age-related molecular and morphological changes and improved SkM strength. Finally, we found that the senescence phenotype is conserved in SkM from older humans. Collectively, our data provide compelling evidence for cellular senescence as a hallmark and potentially tractable mediator of SkM aging.
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Affiliation(s)
- Xu Zhang
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
- These authors equally contributed to this work
| | - Leena Habiballa
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
- Mayo clinic graduate school of biomedical science, rochester, MN, USA
- These authors equally contributed to this work
| | - Zaira Aversa
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
| | - Yan Er Ng
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
| | - Ayumi E. Sakamoto
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
| | - Davis A. Englund
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
| | | | - Thomas A. White
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
| | - Matthew M. Robinson
- School of Biological and Population Health Sciences, College of Public Health and Human Sciences, Oregon State University, Corvallis, OR, USA
| | - Donato A. Rivas
- Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center, Tufts University, Boston, Massachusetts, USA
| | - Surendra Dasari
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, USA
| | - Adam J. Hruby
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - Anthony B. Lagnado
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - Sarah K. Jachim
- Mayo clinic graduate school of biomedical science, rochester, MN, USA
| | - Antoneta Granic
- NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
- AGE Research Group, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Avan A. Sayer
- NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
- AGE Research Group, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Diana Jurk
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - Ian R. Lanza
- Division of Endocrinology, Mayo Clinic, Rochester, MN, USA
| | - Sundeep Khosla
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, Minnesota, USA
| | - Roger A. Fielding
- Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center, Tufts University, Boston, Massachusetts, USA
| | - K. Sreekumaran Nair
- Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, Minnesota, USA
| | - Marissa J. Schafer
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - João F. Passos
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - Nathan K. LeBrasseur
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
- Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
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11
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Zhao Y, Wang Y, Yang D, Suh K, Zhang M. A Computational Framework to Characterize the Cancer Drug Induced Effect on Aging Using Transcriptomic Data. Front Pharmacol 2022; 13:906429. [PMID: 35847024 PMCID: PMC9277350 DOI: 10.3389/fphar.2022.906429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 06/06/2022] [Indexed: 11/23/2022] Open
Abstract
Cancer treatments such as chemotherapies may change or accelerate aging trajectories in cancer patients. Emerging evidence has shown that “omics” data can be used to study molecular changes of the aging process. Here, we integrated the drug-induced and normal aging transcriptomic data to computationally characterize the potential cancer drug-induced aging process in patients. Our analyses demonstrated that the aging-associated gene expression in the GTEx dataset can recapitulate the well-established aging hallmarks. We next characterized the drug-induced transcriptomic changes of 28 FDA approved cancer drugs in brain, kidney, muscle, and adipose tissues. Further drug-aging interaction analysis identified 34 potential drug regulated aging events. Those events include aging accelerating effects of vandetanib (Caprelsa®) and dasatinib (Sprycel®) in brain and muscle, respectively. Our result also demonstrated aging protective effect of vorinostat (Zolinza®), everolimus (Afinitor®), and bosutinib (Bosulif®) in brain.
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Affiliation(s)
- Yueshan Zhao
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA, United States
| | - Yue Wang
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA, United States
| | - Da Yang
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA, United States
- UPMC Hillman Cancer Institute, University of Pittsburgh, Pittsburgh, PA, United States
- Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, PA, United States
| | - Kangho Suh
- Department of Pharmacy and Therapeutics, University of Pittsburgh, Pittsburgh, PA, United States
| | - Min Zhang
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA, United States
- *Correspondence: Min Zhang,
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12
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Ebert SM, Rasmussen BB, Judge AR, Judge SM, Larsson L, Wek RC, Anthony TG, Marcotte GR, Miller MJ, Yorek MA, Vella A, Volpi E, Stern JI, Strub MD, Ryan Z, Talley JJ, Adams CM. Biology of Activating Transcription Factor 4 (ATF4) and Its Role in Skeletal Muscle Atrophy. J Nutr 2022; 152:926-938. [PMID: 34958390 PMCID: PMC8970988 DOI: 10.1093/jn/nxab440] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 12/17/2021] [Accepted: 12/23/2021] [Indexed: 12/30/2022] Open
Abstract
Activating transcription factor 4 (ATF4) is a multifunctional transcription regulatory protein in the basic leucine zipper superfamily. ATF4 can be expressed in most if not all mammalian cell types, and it can participate in a variety of cellular responses to specific environmental stresses, intracellular derangements, or growth factors. Because ATF4 is involved in a wide range of biological processes, its roles in human health and disease are not yet fully understood. Much of our current knowledge about ATF4 comes from investigations in cultured cell models, where ATF4 was originally characterized and where further investigations continue to provide new insights. ATF4 is also an increasingly prominent topic of in vivo investigations in fully differentiated mammalian cell types, where our current understanding of ATF4 is less complete. Here, we review some important high-level concepts and questions concerning the basic biology of ATF4. We then discuss current knowledge and emerging questions about the in vivo role of ATF4 in one fully differentiated cell type, mammalian skeletal muscle fibers.
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Affiliation(s)
- Scott M Ebert
- Department of Internal Medicine, Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, MN, USA
- Emmyon, Inc., Rochester, MN, USA
| | - Blake B Rasmussen
- Emmyon, Inc., Rochester, MN, USA
- Department of Nutrition, Metabolism and Rehabilitation Sciences, University of Texas Medical Branch, Galveston, TX, USA
| | - Andrew R Judge
- Emmyon, Inc., Rochester, MN, USA
- Department of Physical Therapy, University of Florida, Gainesville, FL, USA
| | - Sarah M Judge
- Department of Physical Therapy, University of Florida, Gainesville, FL, USA
| | - Lars Larsson
- Department of Physiology and Pharmacology, Karolinska, Stockholm, Sweden
| | - Ronald C Wek
- Department of Biochemistry and Molecular Biology, Indiana University, Indianapolis, IN, USA
| | - Tracy G Anthony
- Department of Nutritional Sciences, Rutgers University, New Brunswick, NJ, USA
| | - George R Marcotte
- Department of Internal Medicine, Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, MN, USA
- Department of Internal Medicine, University of Iowa, Iowa City, IA, USA
| | - Matthew J Miller
- Department of Internal Medicine, Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, MN, USA
- Department of Internal Medicine, University of Iowa, Iowa City, IA, USA
| | - Mark A Yorek
- Department of Internal Medicine, University of Iowa, Iowa City, IA, USA
- Department of Internal Medicine, Iowa City VA Medical Center, Iowa City, IA, USA
| | - Adrian Vella
- Department of Internal Medicine, Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, MN, USA
- Emmyon, Inc., Rochester, MN, USA
| | - Elena Volpi
- Department of Nutrition, Metabolism and Rehabilitation Sciences, University of Texas Medical Branch, Galveston, TX, USA
| | - Jennifer I Stern
- Department of Internal Medicine, Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, MN, USA
| | - Matthew D Strub
- Department of Internal Medicine, Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, MN, USA
| | - Zachary Ryan
- Department of Internal Medicine, Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, MN, USA
| | | | - Christopher M Adams
- Department of Internal Medicine, Division of Endocrinology, Diabetes, Metabolism and Nutrition, Mayo Clinic, Rochester, MN, USA
- Emmyon, Inc., Rochester, MN, USA
- Department of Internal Medicine, Iowa City VA Medical Center, Iowa City, IA, USA
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13
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Ruan L, Mendhe B, Parker E, Kent A, Isales CM, Hill WD, McGee-Lawrence M, Fulzele S, Hamrick MW. Long Non-coding RNA MALAT1 Is Depleted With Age in Skeletal Muscle in vivo and MALAT1 Silencing Increases Expression of TGF-β1 in vitro. Front Physiol 2022; 12:742004. [PMID: 35126169 PMCID: PMC8814451 DOI: 10.3389/fphys.2021.742004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 12/16/2021] [Indexed: 01/10/2023] Open
Abstract
Long non-coding RNAs (lncRNAs) are thought to function as “sponges” for microRNAs, but a role for such competing endogenous RNAs (ceRNAs) in muscle aging is not well understood. We therefore examined in skeletal muscles of young (4–6 months) and aged (22–24) male and female mice the expression of lncRNA MALAT1, which is predicted in silico to bind the senescence-associated microRNA miR-34a-5p. Results indicate a significant decrease in lncRNA MALAT1 expression in mouse skeletal muscle with age that coincides with an age-related increase in miR-34a-5p expression. In vitro studies using mouse C2C12 myoblasts demonstrate that MALAT1 silencing using siRNA increases miR-34a expression, consistent with a role for MALAT1 as an inhibitor of miR-34a-5p activity. Levels of reactive oxygen species (ROS) are known to increase in muscle with age, and so we treated C2C12 cells with hydrogen peroxide (10 and 100 μM) to examine changes in MALAT1 expression. MALAT1 expression decreased significantly with H2O2 treatment, but this effect was attenuated with p53 siRNA. Finally, miR-34a-5p is implicated in tissue fibrosis, and so we assessed the expression of TGF-β1 after MALAT1 silencing. MALAT1 siRNA significantly increased the expression of TGF-β1 in C2C12 cells. These findings suggest that age-related fibrosis and muscle atrophy mediated by ROS may result at least in part from an increase in miR-34a bioavailability resulting from a decline in miR-34a “sponging” due to ceRNA MALAT1 depletion. Crosstalk between MALAT1 and miR-34a may therefore represent a therapeutic target for improving muscle function with aging.
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Affiliation(s)
- Ling Ruan
- Medical College of Georgia, Augusta University, Augusta, GA, United States
| | - Bharati Mendhe
- Medical College of Georgia, Augusta University, Augusta, GA, United States
| | - Emily Parker
- Medical College of Georgia, Augusta University, Augusta, GA, United States
| | - Andrew Kent
- Medical College of Georgia, Augusta University, Augusta, GA, United States
| | - Carlos M. Isales
- Medical College of Georgia, Augusta University, Augusta, GA, United States
| | - William D. Hill
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, United States
| | | | - Sadanand Fulzele
- Medical College of Georgia, Augusta University, Augusta, GA, United States
| | - Mark W. Hamrick
- Medical College of Georgia, Augusta University, Augusta, GA, United States
- *Correspondence: Mark W. Hamrick,
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14
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Williams EG, Pfister N, Roy S, Statzer C, Haverty J, Ingels J, Bohl C, Hasan M, Čuklina J, Bühlmann P, Zamboni N, Lu L, Ewald CY, Williams RW, Aebersold R. Multiomic profiling of the liver across diets and age in a diverse mouse population. Cell Syst 2022; 13:43-57.e6. [PMID: 34666007 PMCID: PMC8776606 DOI: 10.1016/j.cels.2021.09.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 07/12/2021] [Accepted: 09/14/2021] [Indexed: 01/21/2023]
Abstract
We profiled the liver transcriptome, proteome, and metabolome in 347 individuals from 58 isogenic strains of the BXD mouse population across age (7 to 24 months) and diet (low or high fat) to link molecular variations to metabolic traits. Several hundred genes are affected by diet and/or age at the transcript and protein levels. Orthologs of two aging-associated genes, St7 and Ctsd, were knocked down in C. elegans, reducing longevity in wild-type and mutant long-lived strains. The multiomics data were analyzed as segregating gene networks according to each independent variable, providing causal insight into dietary and aging effects. Candidates were cross-examined in an independent diversity outbred mouse liver dataset segregating for similar diets, with ∼80%-90% of diet-related candidate genes found in common across datasets. Together, we have developed a large multiomics resource for multivariate analysis of complex traits and demonstrate a methodology for moving from observational associations to causal connections.
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Affiliation(s)
- Evan G Williams
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg.
| | - Niklas Pfister
- Department of Mathematical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Suheeta Roy
- Department of Genetics, Genomics and Informatics, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Cyril Statzer
- Department of Health Sciences and Technology, ETH Zürich, Zurich, Switzerland
| | - Jack Haverty
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Jesse Ingels
- Department of Genetics, Genomics and Informatics, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Casey Bohl
- Department of Genetics, Genomics and Informatics, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Moaraj Hasan
- Department of Biology, Institute of Molecular Systems Biology, ETH Zürich, Zurich, Switzerland
| | - Jelena Čuklina
- Department of Biology, Institute of Molecular Systems Biology, ETH Zürich, Zurich, Switzerland
| | - Peter Bühlmann
- Department of Mathematics, Seminar for Statistics, ETH Zürich, Zurich, Switzerland
| | - Nicola Zamboni
- Department of Biology, Institute of Molecular Systems Biology, ETH Zürich, Zurich, Switzerland
| | - Lu Lu
- Department of Genetics, Genomics and Informatics, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Collin Y Ewald
- Department of Health Sciences and Technology, ETH Zürich, Zurich, Switzerland
| | - Robert W Williams
- Department of Genetics, Genomics and Informatics, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Ruedi Aebersold
- Department of Biology, Institute of Molecular Systems Biology, ETH Zürich, Zurich, Switzerland; Faculty of Science, University of Zürich, Zurich, Switzerland
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15
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Englund DA, Zhang X, Aversa Z, LeBrasseur NK. Skeletal muscle aging, cellular senescence, and senotherapeutics: Current knowledge and future directions. Mech Ageing Dev 2021; 200:111595. [PMID: 34742751 PMCID: PMC8627455 DOI: 10.1016/j.mad.2021.111595] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/29/2021] [Accepted: 11/01/2021] [Indexed: 12/16/2022]
Abstract
Cellular senescence is a state of cell cycle arrest induced by several forms of metabolic stress. Senescent cells accumulate with advancing age and have a distinctive phenotype, characterized by profound chromatin alterations and a robust senescence-associated secretory phenotype (SASP) that exerts negative effects on tissue health, both locally and systemically. In preclinical models, pharmacological agents that eliminate senescent cells (senotherapeutics) restore health and youthful properties in multiple tissues. To date, however, very little is understood about the vulnerability of terminally-differentiated skeletal muscle fibers and the resident mononuclear cells that populate the interstitial microenvironment of skeletal muscle to senescence, and their contribution to the onset and progression of skeletal muscle loss and dysfunction with aging. Scientific advances in these areas have the potential to highlight new therapeutic approaches to optimize late-life muscle health. To this end, this review highlights the current evidence and the key questions that need to be addressed to advance the field's understanding of cellular senescence as a mediator of skeletal muscle aging and the potential for emerging senescent cell-targeting therapies to counter age-related deficits in muscle mass, strength, and function. This article is part of the Special Issue - Senolytics - Edited by Joao Passos and Diana Jurk.
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Affiliation(s)
- Davis A Englund
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA; Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
| | - Xu Zhang
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA; Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
| | - Zaira Aversa
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA; Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA
| | - Nathan K LeBrasseur
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA; Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN, USA; Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA.
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16
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Saito Y, Chikenji TS. Diverse Roles of Cellular Senescence in Skeletal Muscle Inflammation, Regeneration, and Therapeutics. Front Pharmacol 2021; 12:739510. [PMID: 34552495 PMCID: PMC8450382 DOI: 10.3389/fphar.2021.739510] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 08/23/2021] [Indexed: 12/19/2022] Open
Abstract
Skeletal muscle undergoes vigorous tissue remodeling after injury. However, aging, chronic inflammatory diseases, sarcopenia, and neuromuscular disorders cause muscle loss and degeneration, resulting in muscular dysfunction. Cellular senescence, a state of irreversible cell cycle arrest, acts during normal embryonic development and remodeling after tissue damage; when these processes are complete, the senescent cells are eliminated. However, the accumulation of senescent cells is a hallmark of aging tissues or pathological contexts and may lead to progressive tissue degeneration. The mechanisms responsible for the effects of senescent cells have not been fully elucidated. Here, we review current knowledge about the beneficial and detrimental effects of senescent cells in tissue repair, regeneration, aging, and age-related disease, especially in skeletal muscle. We also discuss how senescence of muscle stem cells and muscle-resident fibro-adipogenic progenitors affects muscle pathologies or regeneration, and consider the possibility that immunosenescence leads to muscle pathogenesis. Finally, we explore senotherapy, the therapeutic targeting of senescence to treat age-related disease, from the standpoint of improving muscle regeneration.
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Affiliation(s)
- Yuki Saito
- Department of Anatomy, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Takako S Chikenji
- Department of Anatomy, Sapporo Medical University School of Medicine, Sapporo, Japan.,Department of Health Sciences, School of Medicine, Hokkaido University, Sapporo, Japan
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17
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Takeshita H, Yamamoto K, Mogi M, Wang Y, Nozato Y, Fujimoto T, Yokoyama S, Hongyo K, Nakagami F, Akasaka H, Takami Y, Takeya Y, Sugimoto K, Horiuchi M, Rakugi H. Double Deletion of Angiotensin II Type 2 and Mas Receptors Accelerates Aging-Related Muscle Weakness in Male Mice. J Am Heart Assoc 2021; 10:e021030. [PMID: 34212761 PMCID: PMC8403326 DOI: 10.1161/jaha.120.021030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 04/16/2021] [Indexed: 12/28/2022]
Abstract
Background The activation of AT2 (angiotensin II type 2 receptor ) and Mas receptor by angiotensin II and angiotensin-(1-7), respectively, is the primary process that counteracts activation of the canonical renin-angiotensin system (RAS). Although inhibition of canonical RAS could delay the progression of physiological aging, we recently reported that deletion of Mas had no impact on the aging process in mice. Here, we used male mice with a deletion of only AT2 or a double deletion of AT2 and Mas to clarify whether these receptors contribute to the aging process in a complementary manner, primarily by focusing on aging-related muscle weakness. Methods and Results Serial changes in grip strength of these mice up to 24 months of age showed that AT2/Mas knockout mice, but not AT2 knockout mice, had significantly weaker grip strength than wild-type mice from the age of 18 months. AT2/Mas knockout mice exhibited larger sizes, but smaller numbers and increased frequency of central nucleation (a marker of aged muscle) of single skeletal muscle fibers than AT2 knockout mice. Canonical RAS-associated genes, inflammation-associated genes, and senescence-associated genes were highly expressed in skeletal muscles of AT2/Mas knockout mice. Muscle angiotensin II content increased in AT2/Mas knockout mice. Conclusions Double deletion of AT2 and Mas in mice exaggerated aging-associated muscle weakness, accompanied by signatures of activated RAS, inflammation, and aging in skeletal muscles. Because aging-associated phenotypes were absent in single deletions of the receptors, AT2 and Mas could complement each other in preventing local activation of RAS during aging.
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MESH Headings
- Age Factors
- Animals
- Fibrosis
- Gene Expression Regulation
- Genetic Predisposition to Disease
- Hand Strength
- Inflammation Mediators/metabolism
- Male
- Mice, Inbred C57BL
- Mice, Knockout
- Muscle Strength/genetics
- Muscle Weakness/genetics
- Muscle Weakness/metabolism
- Muscle Weakness/pathology
- Muscle Weakness/physiopathology
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Muscle, Skeletal/physiopathology
- Phenotype
- Proto-Oncogene Mas
- Proto-Oncogene Proteins/deficiency
- Proto-Oncogene Proteins/genetics
- Receptor, Angiotensin, Type 2/deficiency
- Receptor, Angiotensin, Type 2/genetics
- Receptors, G-Protein-Coupled/deficiency
- Receptors, G-Protein-Coupled/genetics
- Renin-Angiotensin System/genetics
- Mice
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Affiliation(s)
- Hikari Takeshita
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Koichi Yamamoto
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Masaki Mogi
- Department of PharmacologyEhime University Graduate School of MedicineEhimeJapan
| | - Yu Wang
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Yoichi Nozato
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Taku Fujimoto
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Serina Yokoyama
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Kazuhiro Hongyo
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Futoshi Nakagami
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Hiroshi Akasaka
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Yoichi Takami
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Yasushi Takeya
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Ken Sugimoto
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
| | - Masatsugu Horiuchi
- Department of Molecular Cardiovascular Biology and PharmacologyEhime University Graduate School of MedicineEhimeJapan
| | - Hiromi Rakugi
- Department of Geriatric and General MedicineOsaka University Graduate School of MedicineSuitaJapan
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18
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López-Domínguez JA, Rodríguez-López S, Ahumada-Castro U, Desprez PY, Konovalenko M, Laberge RM, Cárdenas C, Villalba JM, Campisi J. Cdkn1a transcript variant 2 is a marker of aging and cellular senescence. Aging (Albany NY) 2021; 13:13380-13392. [PMID: 34035185 PMCID: PMC8202863 DOI: 10.18632/aging.203110] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 05/18/2021] [Indexed: 12/18/2022]
Abstract
Cellular senescence is a cell fate response characterized by a permanent cell cycle arrest driven primarily the by cell cycle inhibitor and tumor suppressor proteins p16Ink4a and p21Cip1/Waf1. In mice, the p21Cip1/Waf1 encoding locus, Cdkn1a, is known to generate two transcripts that produce identical proteins, but one of these transcript variants is poorly characterized. We show that the Cdkn1a transcript variant 2, but not the better-studied variant 1, is selectively elevated during natural aging across multiple mouse tissues. Importantly, mouse cells induced to senescence in culture by genotoxic stress (ionizing radiation or doxorubicin) upregulated both transcripts, but with different temporal dynamics: variant 1 responded nearly immediately to genotoxic stress, whereas variant 2 increased much more slowly as cells acquired senescent characteristics. Upon treating mice systemically with doxorubicin, which induces widespread cellular senescence in vivo, variant 2 increased to a larger extent than variant 1. Variant 2 levels were also more sensitive to the senolytic drug ABT-263 in naturally aged mice. Thus, variant 2 is a novel and more sensitive marker than variant 1 or total p21Cip1/Waf1 protein for assessing the senescent cell burden and clearance in mice.
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Affiliation(s)
| | - Sandra Rodríguez-López
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, 14071, Córdoba, Spain
| | - Ulises Ahumada-Castro
- Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago 2422, Chile
- Geroscience Center for Brain Health and Metabolism, Santiago, Chile
| | | | | | | | - César Cárdenas
- Buck Institute for Research on Aging, Novato, CA 94945, USA
- Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago 2422, Chile
- Geroscience Center for Brain Health and Metabolism, Santiago, Chile
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106, USA
| | - José Manuel Villalba
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, 14071, Córdoba, Spain
| | - Judith Campisi
- Buck Institute for Research on Aging, Novato, CA 94945, USA
- Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA
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19
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Moustogiannis A, Philippou A, Taso O, Zevolis E, Pappa M, Chatzigeorgiou A, Koutsilieris M. The Effects of Muscle Cell Aging on Myogenesis. Int J Mol Sci 2021; 22:ijms22073721. [PMID: 33918414 PMCID: PMC8038215 DOI: 10.3390/ijms22073721] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 03/30/2021] [Accepted: 03/31/2021] [Indexed: 02/06/2023] Open
Abstract
The process of myogenesis gradually deteriorates as the skeletal muscle ages, contributing to muscle mass loss. The aim of this study is to investigate the effect of senescence/aging on skeletal myogenesis, in vitro. A model of multiple cell divisions of C2C12 myoblasts was used to replicate cell senescence. Control and aged myoblasts were investigated during myogenesis, i.e., at days 0, 2, and 6of differentiation. SA-β-gal activity and comet assay were used as markers of aging and DNA damage. Flow cytometry was performed to characterize potential differences in cell cycle between control and aged cells. Alterations in the mRNA and/or protein expression of myogenic regulatory factors (MRFs), IGF-1 isoforms, apoptotic, atrophy, inflammatory, metabolic and aging-related factors were evaluated. Compared with the control cells, aged myoblasts exhibited G0/G1 cell cycle arrest, DNA damage, increased SA-β-gal activity, and increased expression of aging-related factors p16 and p21 during differentiation. Moreover, aged myoblasts showed a reduction in the expression of MRFs and metabolic/anabolic factors, along with an increased expression of apoptotic, atrophy and inflammatory factors. A diminished differentiation capacity characterized the aged myoblasts which, in combination with the induction of apoptotic and atrophy factors, indicated a disrupted myogenic lineage in the senescent muscle cells.
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Affiliation(s)
- Athanasios Moustogiannis
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 MicrasAsias, 115 27 Goudi-Athens, Greece; (A.P.); (O.T.); (E.Z.); (A.C.); (M.K.)
- Correspondence: ; Tel.: +30-210-7462690; Fax: +30-210-7462571
| | - Anastassios Philippou
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 MicrasAsias, 115 27 Goudi-Athens, Greece; (A.P.); (O.T.); (E.Z.); (A.C.); (M.K.)
| | - Orjona Taso
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 MicrasAsias, 115 27 Goudi-Athens, Greece; (A.P.); (O.T.); (E.Z.); (A.C.); (M.K.)
| | - Evangelos Zevolis
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 MicrasAsias, 115 27 Goudi-Athens, Greece; (A.P.); (O.T.); (E.Z.); (A.C.); (M.K.)
| | - Maria Pappa
- First Department of Propaedeutic Internal Medicine, Joint Rheumatology Program, National and Kapodistrian University of Athens, 75 MicrasAsias, 115 27 Goudi-Athens, Greece;
| | - Antonios Chatzigeorgiou
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 MicrasAsias, 115 27 Goudi-Athens, Greece; (A.P.); (O.T.); (E.Z.); (A.C.); (M.K.)
| | - Michael Koutsilieris
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 MicrasAsias, 115 27 Goudi-Athens, Greece; (A.P.); (O.T.); (E.Z.); (A.C.); (M.K.)
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20
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Wang S, Prizment A, Thyagarajan B, Blaes A. Cancer Treatment-Induced Accelerated Aging in Cancer Survivors: Biology and Assessment. Cancers (Basel) 2021; 13:427. [PMID: 33498754 PMCID: PMC7865902 DOI: 10.3390/cancers13030427] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/17/2021] [Accepted: 01/18/2021] [Indexed: 12/11/2022] Open
Abstract
Rapid improvements in cancer survival led to the realization that many modalities used to treat or control cancer may cause accelerated aging in cancer survivors. Clinically, "accelerated aging" phenotypes in cancer survivors include secondary cancers, frailty, chronic organ dysfunction, and cognitive impairment, all of which can impact long-term health and quality of life in cancer survivors. The treatment-induced accelerated aging in cancer survivors could be explained by telomere attrition, cellular senescence, stem cell exhaustion, DNA damage, and epigenetic alterations. Several aging clocks and biomarkers of aging have been proposed to be potentially useful in estimating biological age, which can provide specific information about how old an individual is biologically independent of chronological age. Measuring biological age in cancer survivors may be important for two reasons. First, it can better predict the risk of cancer treatment-related comorbidities than chronological age. Second, biological age may provide additional value in evaluating the effects of treatments and personalizing cancer therapies to maximize efficacy of treatment. A deeper understanding of treatment-induced accelerated aging in individuals with cancer may lead to novel strategies that reduce the accelerated aging and improve the quality of life in cancer survivors.
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Affiliation(s)
- Shuo Wang
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN 55455, USA
| | - Anna Prizment
- Division of Hematology, Oncology and Transplantation, Medical School, University of Minnesota, Minneapolis, MN 55455, USA; (A.P.); (A.B.)
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, USA;
| | - Bharat Thyagarajan
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, USA;
- Department of Laboratory Medicine and Pathology, Medical School, University of Minnesota, Minneapolis, MN 55455, USA
| | - Anne Blaes
- Division of Hematology, Oncology and Transplantation, Medical School, University of Minnesota, Minneapolis, MN 55455, USA; (A.P.); (A.B.)
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, USA;
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21
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Gorza L, Sorge M, Seclì L, Brancaccio M. Master Regulators of Muscle Atrophy: Role of Costamere Components. Cells 2021; 10:cells10010061. [PMID: 33401549 PMCID: PMC7823551 DOI: 10.3390/cells10010061] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 12/28/2020] [Accepted: 12/29/2020] [Indexed: 12/11/2022] Open
Abstract
The loss of muscle mass and force characterizes muscle atrophy in several different conditions, which share the expression of atrogenes and the activation of their transcriptional regulators. However, attempts to antagonize muscle atrophy development in different experimental contexts by targeting contributors to the atrogene pathway showed partial effects in most cases. Other master regulators might independently contribute to muscle atrophy, as suggested by our recent evidence about the co-requirement of the muscle-specific chaperone protein melusin to inhibit unloading muscle atrophy development. Furthermore, melusin and other muscle mass regulators, such as nNOS, belong to costameres, the macromolecular complexes that connect sarcolemma to myofibrils and to the extracellular matrix, in correspondence with specific sarcomeric sites. Costameres sense a mechanical load and transduce it both as lateral force and biochemical signals. Recent evidence further broadens this classic view, by revealing the crucial participation of costameres in a sarcolemmal “signaling hub” integrating mechanical and humoral stimuli, where mechanical signals are coupled with insulin and/or insulin-like growth factor stimulation to regulate muscle mass. Therefore, this review aims to enucleate available evidence concerning the early involvement of costamere components and additional putative master regulators in the development of major types of muscle atrophy.
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Affiliation(s)
- Luisa Gorza
- Department of Biomedical Sciences, University of Padova, 35121 Padova, Italy
- Correspondence:
| | - Matteo Sorge
- Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy; (M.S.); (L.S.); (M.B.)
| | - Laura Seclì
- Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy; (M.S.); (L.S.); (M.B.)
| | - Mara Brancaccio
- Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy; (M.S.); (L.S.); (M.B.)
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22
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Khan A, Fahad TM, Akther T, Zaman T, Hasan MF, Islam Khan MR, Islam MS, Kishi S. Carbofuran accelerates the cellular senescence and declines the life span of spns1 mutant zebrafish. J Cell Mol Med 2020; 25:1048-1059. [PMID: 33277797 PMCID: PMC7812278 DOI: 10.1111/jcmm.16171] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 11/03/2020] [Accepted: 11/17/2020] [Indexed: 12/16/2022] Open
Abstract
Carbofuran is a carbamate pesticide, widely used in agricultural practices to increase crop productivity. In mammals, carbofuran is known to cause several untoward effects, such as apoptosis in the hippocampal neuron, oxidative stress, loss of memory and chromosomal anomalies. Most of these effects are implicated with cellular senescence. Therefore, the present study aimed to determine the effect of carbofuran on cellular senescence and biological ageing. Spinster homolog 1 (Spns1) is a transmembrane transporter, regulates autolysosomal biogenesis and plays a role in cellular senescence and survival. Using senescence‐associated β‐galactosidase staining, we found that carbofuran accelerates the cellular senescence in spns1 mutant zebrafish. The yolk opaqueness, a premature ageing phenotype in zebrafish embryos, was accelerated by carbofuran treatment. In the survival study, carbofuran shortened the life span of spns1 mutant zebrafish. Autophagy is the cellular lysosomal degradation, usually up‐regulated in the senescent cells. To know the impact of carbofuran exposure on autophagy progress, we established a double‐transgenic zebrafish line, harbouring EGFP‐tagged LC3‐II and mCherry‐tagged Lamp1 on spns1 mutant background, whereas we found, carbofuran exposure synergistically accelerates autolysosome formation with insufficient lysosome‐mediated degradation. Our data collectively suggest that carbofuran exposure synergistically accelerates the cellular senescence and affects biological ageing in spns1 defective animals.
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Affiliation(s)
- Alam Khan
- Department of Pharmacy, University of Rajshahi, Rajshahi, Bangladesh.,Department of Molecular Medicine, The Scripps Research Institute, Jupiter, FL, USA
| | | | - Tanjima Akther
- Department of Pharmacy, University of Rajshahi, Rajshahi, Bangladesh
| | - Tanjeena Zaman
- Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh.,Department of Biology, University of Hail, Hail, Saudi Arabia
| | - Md Faruk Hasan
- Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi, Bangladesh
| | | | | | - Shuji Kishi
- S&J Kishi Research Corporation, Jupiter, FL, USA
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23
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Jeong I, Lim JH, Park JS, Oh YM. Aging-related changes in the gene expression profile of human lungs. Aging (Albany NY) 2020; 12:21391-21403. [PMID: 33168785 PMCID: PMC7695411 DOI: 10.18632/aging.103885] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 07/25/2020] [Indexed: 12/15/2022]
Abstract
Aging is a multifactorial process that leads to molecular and cellular changes, contributing to the susceptibility of most lung diseases. However, the molecular and genetic mechanism of lung aging remains poorly understood. Here, we performed RNA-seq transcriptome analysis of the lung tissues of 68 subjects and analyzed their gene expression profile to evaluate candidate genes related to lung aging. The subjects were classified into two groups (Younger group and Older group) based on their age. Lung tissues were obtained from surgically resected specimens, processed, and analyzed with RNA-seq. The median age of the subjects was 45 years in the Younger group and 74 years in the Older group. Around 71% and 53% of the subjects were female in the Younger and Older groups, respectively. After gene quality control and filtering, differentially expressed gene analysis showed that MAP3K15, CHRM2, and GALNT13 were upregulated in the Younger group, whereas COL17A1 and EDA2R were upregulated in the Older group. Multivariate analysis with adjustment for covariates showed that EDA2R was a risk factor for lung aging. Our study identified differences in the gene expression of the lungs of older subjects compared with younger subjects. These findings may have implications in lung aging.
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Affiliation(s)
- Ina Jeong
- Department of Pulmonary and Critical Care Medicine, National Medical Center, Seoul 05464, Republic of Korea
| | - Jae-Hyun Lim
- Daechung Hospital, Daejeon 35403, Republic of Korea
| | - Jin-Soo Park
- Asan Institute for Life and Science, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05535, Republic of Korea
| | - Yeon-Mok Oh
- Department of Pulmonary and Critical Care Medicine, and Clinical Research Center for Chronic Obstructive Airway Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05535, Republic of Korea
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24
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Ravanidis S, Doxakis E. RNA-Binding Proteins Implicated in Mitochondrial Damage and Mitophagy. Front Cell Dev Biol 2020; 8:372. [PMID: 32582692 PMCID: PMC7287033 DOI: 10.3389/fcell.2020.00372] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Accepted: 04/27/2020] [Indexed: 01/19/2023] Open
Abstract
The mitochondrial lifecycle comprises biogenesis, fusion and cristae remodeling, fission, and breakdown by the autophagosome. This cycle is essential for maintaining proper cellular function, and inhibition of any of these processes results in deterioration of bioenergetics and swift induction of apoptosis, particularly in energy-craving cells such as myocytes and neurons. Regulation of gene expression is a fundamental step in maintaining mitochondrial plasticity, mediated by (1) transcription factors that control the expression of mitochondrial mRNAs and (2) RNA-binding proteins (RBPs) that regulate mRNA splicing, stability, targeting to mitochondria, and translation. More recently, RBPs have been also shown to interact with proteins modulating the mitochondrial lifecycle. Importantly, misexpression or mutations in RBPs give rise to mitochondrial dysfunctions, and there is strong evidence to support that these mitochondrial impairments occur early in disease development, constituting leading causes of pathogenesis. This review presents key aspects of the molecular network of the disease-relevant RBPs, including transactive response DNA-binding protein 43 (TDP43), fused in sarcoma (FUS), T-cell intracellular antigen 1 (TIA1), TIA-related protein (TIAR), and pumilio (PUM) that drive mitochondrial dysfunction in the nervous system.
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Affiliation(s)
- Stylianos Ravanidis
- Center of Basic Research, Biomedical Research Foundation, Academy of Athens, Athens, Greece
| | - Epaminondas Doxakis
- Center of Basic Research, Biomedical Research Foundation, Academy of Athens, Athens, Greece
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25
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Zeng L, Yang J, Peng S, Zhu J, Zhang B, Suh Y, Tu Z. Transcriptome analysis reveals the difference between "healthy" and "common" aging and their connection with age-related diseases. Aging Cell 2020; 19:e13121. [PMID: 32077223 PMCID: PMC7059150 DOI: 10.1111/acel.13121] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 01/17/2020] [Accepted: 02/03/2020] [Indexed: 12/16/2022] Open
Abstract
A key goal of aging research was to understand mechanisms underlying healthy aging and develop methods to promote the human healthspan. One approach is to identify gene regulations unique to healthy aging compared with aging in the general population (i.e., "common" aging). Here, we leveraged Genotype-Tissue Expression (GTEx) project data to investigate "healthy" and "common" aging gene expression regulations at a tissue level in humans and their interconnection with diseases. Using GTEx donors' disease annotations, we defined a "healthy" aging cohort for each tissue. We then compared the age-associated genes derived from this cohort with age-associated genes from the "common" aging cohort which included all GTEx donors; we also compared the "healthy" and "common" aging gene expressions with various disease-associated gene expressions to elucidate the relationships among "healthy," "common" aging and disease. Our analyses showed that 1. GTEx "healthy" and "common" aging shared a large number of gene regulations; 2. Despite the substantial commonality, "healthy" and "common" aging genes also showed distinct function enrichment, and "common" aging genes had a higher enrichment for disease genes; 3. Disease-associated gene regulations were overall different from aging gene regulations. However, for genes regulated by both, their regulation directions were largely consistent, implying some aging processes could increase the susceptibility to disease development; and 4. Possible protective mechanisms were associated with some "healthy" aging gene regulations. In summary, our work highlights several unique features of GTEx "healthy" aging program. This new knowledge could potentially be used to develop interventions to promote the human healthspan.
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Affiliation(s)
- Lu Zeng
- Department of Genetics and Genomic SciencesIcahn School of Medicine at Mount SinaiNew YorkNew York
| | - Jialiang Yang
- Department of Genetics and Genomic SciencesIcahn School of Medicine at Mount SinaiNew YorkNew York
| | - Shouneng Peng
- Department of Genetics and Genomic SciencesIcahn School of Medicine at Mount SinaiNew YorkNew York
| | - Jun Zhu
- Department of Genetics and Genomic SciencesIcahn School of Medicine at Mount SinaiNew YorkNew York
| | - Bin Zhang
- Department of Genetics and Genomic SciencesIcahn School of Medicine at Mount SinaiNew YorkNew York
| | - Yousin Suh
- Department of GeneticsAlbert Einstein College of MedicineNew YorkNew York
| | - Zhidong Tu
- Department of Genetics and Genomic SciencesIcahn School of Medicine at Mount SinaiNew YorkNew York
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26
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Ebert SM, Al-Zougbi A, Bodine SC, Adams CM. Skeletal Muscle Atrophy: Discovery of Mechanisms and Potential Therapies. Physiology (Bethesda) 2020; 34:232-239. [PMID: 31165685 DOI: 10.1152/physiol.00003.2019] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Skeletal muscle atrophy proceeds through a complex molecular signaling network that is just beginning to be understood. Here, we discuss examples of recently identified molecular mechanisms of muscle atrophy and how they highlight an immense need and opportunity for focused biochemical investigations and further unbiased discovery work.
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Affiliation(s)
- Scott M Ebert
- Departments of Internal Medicine and Molecular Physiology and Biophysics, and the Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine, The University of Iowa , Iowa City, Iowa.,Emmyon, Inc., Coralville, Iowa
| | - Asma Al-Zougbi
- Departments of Internal Medicine and Molecular Physiology and Biophysics, and the Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine, The University of Iowa , Iowa City, Iowa
| | - Sue C Bodine
- Departments of Internal Medicine and Molecular Physiology and Biophysics, and the Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine, The University of Iowa , Iowa City, Iowa.,Emmyon, Inc., Coralville, Iowa
| | - Christopher M Adams
- Departments of Internal Medicine and Molecular Physiology and Biophysics, and the Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine, The University of Iowa , Iowa City, Iowa.,Emmyon, Inc., Coralville, Iowa.,Iowa City Veterans Affairs Medical Center, Iowa City, Iowa
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27
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Ebert SM, Bullard SA, Basisty N, Marcotte GR, Skopec ZP, Dierdorff JM, Al-Zougbi A, Tomcheck KC, DeLau AD, Rathmacher JA, Bodine SC, Schilling B, Adams CM. Activating transcription factor 4 (ATF4) promotes skeletal muscle atrophy by forming a heterodimer with the transcriptional regulator C/EBPβ. J Biol Chem 2020; 295:2787-2803. [PMID: 31953319 PMCID: PMC7049960 DOI: 10.1074/jbc.ra119.012095] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 01/10/2020] [Indexed: 12/17/2022] Open
Abstract
Skeletal muscle atrophy is a highly-prevalent and debilitating condition that remains poorly understood at the molecular level. Previous work found that aging, fasting, and immobilization promote skeletal muscle atrophy via expression of activating transcription factor 4 (ATF4) in skeletal muscle fibers. However, the direct biochemical mechanism by which ATF4 promotes muscle atrophy is unknown. ATF4 is a member of the basic leucine zipper transcription factor (bZIP) superfamily. Because bZIP transcription factors are obligate dimers, and because ATF4 is unable to form highly-stable homodimers, we hypothesized that ATF4 may promote muscle atrophy by forming a heterodimer with another bZIP family member. To test this hypothesis, we biochemically isolated skeletal muscle proteins that associate with the dimerization- and DNA-binding domain of ATF4 (the bZIP domain) in mouse skeletal muscle fibers in vivo Interestingly, we found that ATF4 forms at least five distinct heterodimeric bZIP transcription factors in skeletal muscle fibers. Furthermore, one of these heterodimers, composed of ATF4 and CCAAT enhancer-binding protein β (C/EBPβ), mediates muscle atrophy. Within skeletal muscle fibers, the ATF4-C/EBPβ heterodimer interacts with a previously unrecognized and evolutionarily conserved ATF-C/EBP composite site in exon 4 of the Gadd45a gene. This three-way interaction between ATF4, C/EBPβ, and the ATF-C/EBP composite site activates the Gadd45a gene, which encodes a critical mediator of muscle atrophy. Together, these results identify a biochemical mechanism by which ATF4 induces skeletal muscle atrophy, providing molecular-level insights into the etiology of skeletal muscle atrophy.
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Affiliation(s)
- Scott M Ebert
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246; Emmyon, Inc., Coralville, Iowa 52241
| | - Steven A Bullard
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246
| | - Nathan Basisty
- Buck Institute for Research on Aging, Novato, California 94945
| | - George R Marcotte
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246
| | - Zachary P Skopec
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246
| | - Jason M Dierdorff
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246
| | - Asma Al-Zougbi
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246
| | - Kristin C Tomcheck
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246
| | - Austin D DeLau
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246
| | - Jacob A Rathmacher
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246
| | - Sue C Bodine
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Emmyon, Inc., Coralville, Iowa 52241
| | | | - Christopher M Adams
- Departments of Internal Medicine and Molecular Physiology and Biophysics, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa 52242; Iowa City Veterans Affairs Medical Center, Iowa City, Iowa 52246; Emmyon, Inc., Coralville, Iowa 52241.
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28
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Signaling Network of Forkhead Family of Transcription Factors (FOXO) in Dietary Restriction. Cells 2019; 9:cells9010100. [PMID: 31906091 PMCID: PMC7016766 DOI: 10.3390/cells9010100] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 12/25/2019] [Accepted: 12/29/2019] [Indexed: 02/07/2023] Open
Abstract
Dietary restriction (DR), which is defined as a reduction of particular or total nutrient intake without causing malnutrition, has been proved to be a robust way to extend both lifespan and health-span in various species from yeast to mammal. However, the molecular mechanisms by which DR confers benefits on longevity were not yet fully elucidated. The forkhead box O transcription factors (FOXOs), identified as downstream regulators of the insulin/IGF-1 signaling pathway, control the expression of many genes regulating crucial biological processes such as metabolic homeostasis, redox balance, stress response and cell viability and proliferation. The activity of FOXOs is also mediated by AMP-activated protein kinase (AMPK), sirtuins and the mammalian target of rapamycin (mTOR). Therefore, the FOXO-related pathways form a complex network critical for coordinating a response to environmental fluctuations in order to maintain cellular homeostasis and to support physiological aging. In this review, we will focus on the role of FOXOs in different DR interventions. As different DR regimens or calorie (energy) restriction mimetics (CRMs) can elicit both distinct and overlapped DR-related signaling pathways, the benefits of DR may be maximized by combining diverse forms of interventions. In addition, a better understanding of the precise role of FOXOs in different mechanistic aspects of DR response would provide clear cellular and molecular insights on DR-induced increase of lifespan and health-span.
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29
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Candesartan Neuroprotection in Rat Primary Neurons Negatively Correlates with Aging and Senescence: a Transcriptomic Analysis. Mol Neurobiol 2019; 57:1656-1673. [PMID: 31811565 DOI: 10.1007/s12035-019-01800-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 09/22/2019] [Indexed: 12/11/2022]
Abstract
Preclinical experiments and clinical trials demonstrated that angiotensin II AT1 receptor overactivity associates with aging and cellular senescence and that AT1 receptor blockers (ARBs) protect from age-related brain disorders. In a primary neuronal culture submitted to glutamate excitotoxicity, gene set enrichment analysis (GSEA) revealed expression of several hundred genes altered by glutamate and normalized by candesartan correlated with changes in expression in Alzheimer's patient's hippocampus. To further establish whether our data correlated with gene expression alterations associated with aging and senescence, we compared our global transcriptional data with additional published datasets, including alterations in gene expression in the neocortex and cerebellum of old mice, human frontal cortex after age of 40, gene alterations in the Werner syndrome, rodent caloric restriction, Ras and oncogene-induced senescence in fibroblasts, and to tissues besides the brain such as the muscle and kidney. The most significant and enriched pathways associated with aging and senescence were positively correlated with alterations in gene expression in glutamate-injured neurons and, conversely, negatively correlated when the injured neurons were treated with candesartan. Our results involve multiple genes and pathways, including CAV1, CCND1, CDKN1A, CHEK1, ICAM1, IL-1B, IL-6, MAPK14, PTGS2, SERPINE1, and TP53, encoding proteins associated with aging and senescence hallmarks, such as inflammation, oxidative stress, cell cycle and mitochondrial function alterations, insulin resistance, genomic instability including telomere shortening and DNA damage, and the senescent-associated secretory phenotype. Our results demonstrate that AT1 receptor blockade ameliorates central mechanisms of aging and senescence. Using ARBs for prevention and treatment of age-related disorders has important translational value.
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30
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Ullah I, Lee R, Oh KB, Kim Y, Woo JS, Hwang S, Im GS, Ock SA. Stable Regulation of Senescence-Related Genes in Galactose-alpha1,3-galactose Epitope Knockout and Human Membrane Cofactor Protein hCD46 Pig. Transplant Proc 2019; 51:2043-2050. [PMID: 31399182 DOI: 10.1016/j.transproceed.2019.03.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 02/19/2019] [Accepted: 03/13/2019] [Indexed: 12/21/2022]
Abstract
BACKGROUND Pigs are considered suitable animal donor models for xenotransplantation. For successful organ transplantation, immune rejection must be overcome. Xenotransplantation has recently been successfully performed using galactose-alpha1,3-galactose epitopes knockout (GalTKO) and a human membrane cofactor protein (hCD46) in a pig model. However, the growth and lifespan of the grafted organ have not been evaluated. Therefore, in the present study we evaluated aging and 84 senescence-related genes using the RT2 Profiler PCR array and whole blood samples from GalTKO/hCD46 Massachusetts General Hospital (MGH) pigs. METHODS Experimental groups were double GalTKO/hCD46 (5-month-old), single GalTKO/hCD46 (2-year-old), and non-genetically modified (>3.5-year-old; control group within the same strain). Age-matched white hairless Yucatan (WHY) miniature pig groups were used as controls. RESULTS Among the 19 senescence-related genes selected from the 84 genes for further evaluation, 13 were upregulated in the double GalTKO/hCD46 MGH pigs compared to control MGH pigs; however, in WHY pigs, only 4 genes were up- or down-regulated among the 19 genes. Moreover, in double GalTKO/hCD46 MGH and WHY pigs, the expression of the 19 genes changed only 1- to 2-fold, suggesting that there were no significant differences in senescence signals between the 2 pig lines. CONCLUSIONS The present results indicate that the double GalTKO/hCD46 MGH pig might be a suitable model for human xenotransplantation studies. However, we used a limited number of experimental individuals, so further studies using larger experimental groups should be conducted to verify the present results.
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Affiliation(s)
- Imran Ullah
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Iseo-myeon, Wanju-gun, Jeollabuk-do, Republic of Korea
| | - Ran Lee
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Iseo-myeon, Wanju-gun, Jeollabuk-do, Republic of Korea
| | - Keon Bong Oh
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Iseo-myeon, Wanju-gun, Jeollabuk-do, Republic of Korea
| | - Youngim Kim
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Iseo-myeon, Wanju-gun, Jeollabuk-do, Republic of Korea
| | - Jae-Seok Woo
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Iseo-myeon, Wanju-gun, Jeollabuk-do, Republic of Korea
| | - Seongsoo Hwang
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Iseo-myeon, Wanju-gun, Jeollabuk-do, Republic of Korea
| | - Gi-Sun Im
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Iseo-myeon, Wanju-gun, Jeollabuk-do, Republic of Korea
| | - Sun A Ock
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Iseo-myeon, Wanju-gun, Jeollabuk-do, Republic of Korea.
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IL-6 deficiency attenuates p53 protein accumulation in aged male mouse hippocampus. Biogerontology 2019; 21:29-43. [PMID: 31598806 PMCID: PMC6942598 DOI: 10.1007/s10522-019-09841-2] [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] [Received: 08/18/2019] [Accepted: 09/30/2019] [Indexed: 12/18/2022]
Abstract
Our earlier studies demonstrated slower age-related memory decline in IL-6-deficient than in control mice. Therefore, in the present study we evaluated the effect of IL-6 deficiency and aging on expression of p53, connected with accumulation of age-related cellular damages, in hippocampus of 4- and 24-month-old IL-6-deficient C57BL/6J (IL-6KO) and wild type control (WT) mice. The accumulation of p53 protein in hippocampus of aged IL-6KO mice was significantly lower than in aged WT ones, while p53 mRNA level was significantly higher in IL-6-deficient mice, what indicates that the effect was independent on p53 transcription. Presence of few apoptotic cells in hippocampal dentate gyrus and lack of changes in levels of pro-apoptotic Bax, antiapoptotic Bcl-2, as well as in p21 protein in aged animals of both genotypes, points to low transcriptional activity of p53, especially in aged WT mice. Because the amount of p53 protein did not correlate with the level of Mdm2 protein, its main negative regulator, other than Mdm2-dependent mechanism was involved in p53 build-up. Significantly higher mRNA levels of autophagy-associated genes: Pten, Tsc2, and Dram1 in IL-6KO mice, in conjunction with significantly lower amount of Bcl-2 protein in 4-month-old IL-6KO mice, suggests that lack of IL-6/STAT3/Bcl-2 signaling could account for better autophagy performance in these mice, preventing excessive accumulation of proteins. Taken together, attenuated p53 protein build-up, absence of enhanced apoptosis, and transcriptional up-regulation of autophagy-associated genes imply that IL-6 deficiency may protect hippocampus from age-related accumulation of cellular damages.
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Ebert SM, Dierdorff JM, Meyerholz DK, Bullard SA, Al-Zougbi A, DeLau AD, Tomcheck KC, Skopec ZP, Marcotte GR, Bodine SC, Adams CM. An investigation of p53 in skeletal muscle aging. J Appl Physiol (1985) 2019; 127:1075-1084. [PMID: 31465716 PMCID: PMC6850986 DOI: 10.1152/japplphysiol.00363.2019] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 08/06/2019] [Accepted: 08/22/2019] [Indexed: 11/22/2022] Open
Abstract
Age-related skeletal muscle atrophy is a very common and serious condition that remains poorly understood at the molecular level. Several lines of evidence have suggested that the tumor suppressor p53 may play a central, causative role in skeletal muscle aging, whereas other, apparently contradictory lines of evidence have suggested that p53 may be critical for normal skeletal muscle function. To help address these issues, we performed an aging study in male muscle-specific p53-knockout mice (p53 mKO mice), which have a lifelong absence of p53 expression in skeletal muscle fibers. We found that the absence of p53 expression in skeletal muscle fibers had no apparent deleterious or beneficial effects on skeletal muscle mass or function under basal conditions up to 6 mo of age, when mice are fully grown and exhibit peak muscle mass and function. Furthermore, at 22 and 25 mo of age, when age-related muscle weakness and atrophy are clearly evident in mice, p53 mKO mice demonstrated no improvement or worsening of skeletal muscle mass or function relative to littermate control mice. At advanced ages, p53 mKO mice began to die prematurely and had an increased incidence of osteosarcoma, precluding analyses of muscle mass and function in very old p53 mKO mice. In light of these results, we conclude that p53 expression in skeletal muscle fibers has minimal if any direct, cell autonomous effect on basal or age-related changes in skeletal muscle mass and function up to at least 22 mo of age.NEW & NOTEWORTHY Previous studies implicated the transcriptional regulator p53 as a potential mediator of age-related skeletal muscle weakness and atrophy. We tested this hypothesis by investigating the effect of aging in muscle-specific p53-knockout mice. Our results strongly suggest that p53 activity within skeletal muscle fibers is not required for age-related skeletal muscle atrophy or weakness.
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Affiliation(s)
- Scott M Ebert
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
- Emmyon, Inc., Coralville, Iowa
| | - Jason M Dierdorff
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
| | | | - Steven A Bullard
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
| | - Asma Al-Zougbi
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
| | - Austin D DeLau
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
| | - Kristin C Tomcheck
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
| | - Zachary P Skopec
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
| | - George R Marcotte
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
| | - Sue C Bodine
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
- Emmyon, Inc., Coralville, Iowa
| | - Christopher M Adams
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa
- Emmyon, Inc., Coralville, Iowa
- Iowa City Department of Veterans Affairs Medical Center, Iowa City, Iowa
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Angiotensin 1-7 alleviates aging-associated muscle weakness and bone loss, but is not associated with accelerated aging in ACE2-knockout mice. Clin Sci (Lond) 2019; 133:2005-2018. [PMID: 31519791 DOI: 10.1042/cs20190573] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 08/30/2019] [Accepted: 09/12/2019] [Indexed: 01/05/2023]
Abstract
The angiotensin-converting enzyme 2 (ACE2)-angiotensin 1-7 (A1-7)-A1-7 receptor (Mas) axis plays a protective role in the renin-angiotensin system (RAS). We recently found that ACE2 knockout (ACE2KO) mice exhibit earlier aging-associated muscle weakness, and that A1-7 alleviates muscle weakness in aging mice. In the present study, we investigated the role of the A1-7-Mas pathway in the effect of ACE2 on physiological aging. Male wild-type, ACE2KO, and Mas knockout (MasKO) mice were subjected to periodical grip strength measurement, followed by administration of A1-7 or vehicle for 4 weeks at 24 months of age. ACE2KO mice exhibited decreased grip strength after 6 months of age, while grip strength of MasKO mice was similar to that of wild-type mice. A1-7 improved grip strength in ACE2KO and wild-type mice, but not in MasKO mice. Muscle fibre size was smaller in ACE2KO mice than that in wild-type and MasKO mice, and increased with A1-7 in ACE2KO and WT mice, but not in MasKO mice. Centrally nucleated fibres (CNFs) and expression of the senescence-associated gene p16INK4a in skeletal muscles were enhanced only in ACE2KO mice and were not altered by A1-7. ACE2KO mice, but not MasKO mice, exhibited thinning of peripheral fat along with increased adipose expression of p16INK4a A1-7 significantly increased bone volume in wild-type and ACE2KO mice, but not in MasKO mice. Our findings suggest that the impact of ACE2 on physiological aging does not depend on the endogenous production of A1-7 by ACE2, while overactivation of the A1-7-Mas pathway could alleviate sarcopenia and osteoporosis in aged mice.
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Hart CR, Ryan ZC, Pfaffenbach KT, Dasari S, Parvizi M, Lalia AZ, Lanza IR. Attenuated activation of the unfolded protein response following exercise in skeletal muscle of older adults. Aging (Albany NY) 2019; 11:7587-7604. [PMID: 31525732 PMCID: PMC6781982 DOI: 10.18632/aging.102273] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Accepted: 09/05/2019] [Indexed: 12/11/2022]
Abstract
Sarcopenia is linked with impaired adaptive responses to exercise in aging skeletal muscle. The unfolded protein response (UPR) is an important intramyocellular molecular response pathway that is activated by exercise. The influence of age on skeletal muscle adaptive UPR in response to exercise, and the relationship to other key exercise-responsive regulatory pathways is not well-understood. We evaluated age-related changes in transcriptional markers of UPR activation following a single bout of resistance exercise in 12 young (27 ± 5yrs) and 12 older (75 ± 5yrs) healthy men and women. At baseline, there were modest differences in expression of UPR-related genes in young and older adults. Following exercise, transcriptional markers of UPR pathway activation were attenuated in older adults compared to young based on specific salient UPR-related genes and gene set enrichment analysis. The coordination of post-exercise transcriptional patterns between the UPR pathway, p53/p21 axis of autophagy, and satellite cell differentiation were less evident in older compared to young adults. In conclusion, transcriptomic analysis revealed an age-related decline in the adaptive UPR transcriptional response following a single bout of exercise that could contribute to impaired exercise responsiveness with age.
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Affiliation(s)
- Corey R. Hart
- Division of Endocrinology and Metabolism, Mayo Clinic College of Medicine, Rochester, MN 55905, USA
| | - Zachary C. Ryan
- Division of Endocrinology and Metabolism, Mayo Clinic College of Medicine, Rochester, MN 55905, USA
| | - Kyle T. Pfaffenbach
- Department of Physical Activity and Health, Eastern Oregon University, La Grande, OR 97850, USA
| | - Surendra Dasari
- Division of Biostatistics and Informatics, Mayo Clinic College of Medicine, Rochester, MN 55905, USA
| | - Mojtaba Parvizi
- Division of Endocrinology and Metabolism, Mayo Clinic College of Medicine, Rochester, MN 55905, USA
| | - Antigoni Z. Lalia
- Division of Endocrinology and Metabolism, Mayo Clinic College of Medicine, Rochester, MN 55905, USA
| | - Ian R. Lanza
- Division of Endocrinology and Metabolism, Mayo Clinic College of Medicine, Rochester, MN 55905, USA
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Identification and Application of Gene Expression Signatures Associated with Lifespan Extension. Cell Metab 2019; 30:573-593.e8. [PMID: 31353263 PMCID: PMC6907080 DOI: 10.1016/j.cmet.2019.06.018] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 04/14/2019] [Accepted: 06/27/2019] [Indexed: 02/06/2023]
Abstract
Several pharmacological, dietary, and genetic interventions that increase mammalian lifespan are known, but general principles of lifespan extension remain unclear. Here, we performed RNA sequencing (RNA-seq) analyses of mice subjected to 8 longevity interventions. We discovered a feminizing effect associated with growth hormone regulation and diminution of sex-related differences. Expanding this analysis to 17 interventions with public data, we observed that many interventions induced similar gene expression changes. We identified hepatic gene signatures associated with lifespan extension across interventions, including upregulation of oxidative phosphorylation and drug metabolism, and showed that perturbed pathways may be shared across tissues. We further applied the discovered longevity signatures to identify new lifespan-extending candidates, such as chronic hypoxia, KU-0063794, and ascorbyl-palmitate. Finally, we developed GENtervention, an app that visualizes associations between gene expression changes and longevity. Overall, this study describes general and specific transcriptomic programs of lifespan extension in mice and provides tools to discover new interventions.
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Picca A, Mankowski RT, Burman JL, Donisi L, Kim JS, Marzetti E, Leeuwenburgh C. Mitochondrial quality control mechanisms as molecular targets in cardiac ageing. Nat Rev Cardiol 2019; 15:543-554. [PMID: 30042431 DOI: 10.1038/s41569-018-0059-z] [Citation(s) in RCA: 195] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Cardiovascular disease is the leading cause of morbidity and mortality worldwide. Advancing age is a major risk factor for developing cardiovascular disease because of the lifelong exposure to cardiovascular risk factors and specific alterations affecting the heart and the vasculature during ageing. Indeed, the ageing heart is characterized by structural and functional changes that are caused by alterations in fundamental cardiomyocyte functions. In particular, the myocardium is heavily dependent on mitochondrial oxidative metabolism and is especially susceptible to mitochondrial dysfunction. Indeed, primary alterations in mitochondrial function, which are subsequently amplified by defective quality control mechanisms, are considered to be major contributing factors to cardiac senescence. In this Review, we discuss the mechanisms linking defective mitochondrial quality control mechanisms (that is, proteostasis, biogenesis, dynamics, and autophagy) to organelle dysfunction in the context of cardiac ageing. We also illustrate relevant molecular pathways that might be exploited for the prevention and treatment of age-related heart dysfunction.
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Affiliation(s)
- Anna Picca
- Department of Geriatrics, Neuroscience and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine, Rome, Italy
| | - Robert T Mankowski
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, USA
| | - Jonathon L Burman
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, USA.,National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Luca Donisi
- Department of Geriatrics, Neuroscience and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine, Rome, Italy.,Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, USA
| | - Jae-Sung Kim
- Department of Surgery, University of Florida, Gainesville, FL, USA
| | - Emanuele Marzetti
- Department of Geriatrics, Neuroscience and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine, Rome, Italy.
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Turan ZG, Parvizi P, Dönertaş HM, Tung J, Khaitovich P, Somel M. Molecular footprint of Medawar's mutation accumulation process in mammalian aging. Aging Cell 2019; 18:e12965. [PMID: 31062469 PMCID: PMC6612638 DOI: 10.1111/acel.12965] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 02/14/2019] [Accepted: 03/28/2019] [Indexed: 12/20/2022] Open
Abstract
Medawar's mutation accumulation hypothesis explains aging by the declining force of natural selection with age: Slightly deleterious germline mutations expressed in old age can drift to fixation and thereby lead to aging‐related phenotypes. Although widely cited, empirical evidence for this hypothesis has remained limited. Here, we test one of its predictions that genes relatively highly expressed in old adults should be under weaker purifying selection than genes relatively highly expressed in young adults. Combining 66 transcriptome datasets (including 16 tissues from five mammalian species) with sequence conservation estimates across mammals, here we report that the overall conservation level of expressed genes is lower at old age compared to young adulthood. This age‐related decrease in transcriptome conservation (ADICT) is systematically observed in diverse mammalian tissues, including the brain, liver, lung, and artery, but not in others, most notably in the muscle and heart. Where observed, ADICT is driven partly by poorly conserved genes being up‐regulated during aging. In general, the more often a gene is found up‐regulated with age among tissues and species, the lower its evolutionary conservation. Poorly conserved and up‐regulated genes have overlapping functional properties that include responses to age‐associated tissue damage, such as apoptosis and inflammation. Meanwhile, these genes do not appear to be under positive selection. Hence, genes contributing to old age phenotypes are found to harbor an excess of slightly deleterious alleles, at least in certain tissues. This supports the notion that genetic drift shapes aging in multicellular organisms, consistent with Medawar's mutation accumulation hypothesis.
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Affiliation(s)
- Zeliha Gözde Turan
- Department of Biological Sciences Middle East Technical University Ankara Turkey
| | - Poorya Parvizi
- Department of Biological Sciences Middle East Technical University Ankara Turkey
- Usher Institute of Population Health Sciences and Informatics University of Edinburgh Edinburgh UK
| | - Handan Melike Dönertaş
- European Molecular Biology Laboratory, European Bioinformatics Institute EMBL‐EBI Wellcome Trust Genome Campus Cambridge UK
| | - Jenny Tung
- Department of Evolutionary Anthropology Duke University Durham North Carolina
- Department of Biology Duke University Durham North Carolina
- Duke Population Research Institute Duke University Durham North Carolina
| | - Philipp Khaitovich
- Center for Neurobiology and Brain Restoration Skolkovo Institute of Science and Technology Moscow Russia
- CAS Key Laboratory of Computational Biology, CAS‐MPG Partner Institute for Computational Biology, Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai China
| | - Mehmet Somel
- Department of Biological Sciences Middle East Technical University Ankara Turkey
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38
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Habiballa L, Salmonowicz H, Passos JF. Mitochondria and cellular senescence: Implications for musculoskeletal ageing. Free Radic Biol Med 2019; 132:3-10. [PMID: 30336251 DOI: 10.1016/j.freeradbiomed.2018.10.417] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 09/25/2018] [Accepted: 10/09/2018] [Indexed: 01/07/2023]
Abstract
Musculoskeletal ageing and its associated diseases are major contributors to the loss of independence and reduced quality of life in older people. Several recent studies indicate that cellular senescence is a contributor to age-related loss of function in various organs including muscle, bones and joints. Importantly, these studies indicate that therapies targeting specifically senescent cells have great therapeutic potential in improving musculoskeletal health during ageing. Senescent cells are characterised by dramatic changes in mitochondrial function, metabolism and homeostasis. Mitochondrial dysfunction has been shown to contribute to senescence and the SASP. Here we review the role of cellular senescence in musculoskeletal ageing as well as the potential mechanisms by which mitochondrial dysfunction may impact on the induction and development of the senescent phenotype.
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Affiliation(s)
- Leena Habiballa
- Institute for Cell and Molecular Biosciences & Newcastle University Institute for Ageing, Newcastle upon Tyne NE4 5PL, UK
| | - Hanna Salmonowicz
- Institute for Cell and Molecular Biosciences & Newcastle University Institute for Ageing, Newcastle upon Tyne NE4 5PL, UK
| | - João F Passos
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN 55905, USA.
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Fernando R, Drescher C, Nowotny K, Grune T, Castro JP. Impaired proteostasis during skeletal muscle aging. Free Radic Biol Med 2019; 132:58-66. [PMID: 30194981 DOI: 10.1016/j.freeradbiomed.2018.08.037] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 08/03/2018] [Accepted: 08/30/2018] [Indexed: 01/03/2023]
Abstract
Aging is a complex phenomenon that has detrimental effects on tissue homeostasis. The skeletal muscle is one of the earliest tissues to be affected and to manifest age-related changes such as functional impairment and the loss of mass. Common to these alterations and to most of tissues during aging is the disruption of the proteostasis network by detrimental changes in the ubiquitin-proteasomal system (UPS) and the autophagy-lysosomal system (ALS). In fact, during aging the accumulation of protein aggregates, a process mainly driven by increased levels of oxidative stress, has been observed, clearly demonstrating UPS and ALS dysregulation. Since the UPS and ALS are the two most important pathways for the removal of misfolded and aggregated proteins and also of damaged organelles, we provide here an overview on the current knowledge regarding the connection between the loss of proteostasis and skeletal muscle functional impairment and also how redox regulation can play a role during aging. Therefore, this review serves for a better understanding of skeletal muscle aging in regard to the loss of proteostasis and how redox regulation can impact its function and maintenance.
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Affiliation(s)
- Raquel Fernando
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbrücke, 14558 Nuthetal, Germany
| | - Cathleen Drescher
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbrücke, 14558 Nuthetal, Germany
| | - Kerstin Nowotny
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbrücke, 14558 Nuthetal, Germany
| | - Tilman Grune
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbrücke, 14558 Nuthetal, Germany; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany; German Center for Cardiovascular Research (DZHK), 10117 Berlin, Germany; University of Potsdam, Institute of Nutritional Science, 14558 Nuthetal, Germany
| | - José Pedro Castro
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbrücke, 14558 Nuthetal, Germany; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany; Faculty of Medicine, Department for Biomedicine, University of Porto, 4200-319, Portugal; Institute for Innovation and Health Research (I3S), Aging and Stress Group, R. Alfredo Allen, 4200-135 Porto, Portugal.
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D'Amico D, Mottis A, Potenza F, Sorrentino V, Li H, Romani M, Lemos V, Schoonjans K, Zamboni N, Knott G, Schneider BL, Auwerx J. The RNA-Binding Protein PUM2 Impairs Mitochondrial Dynamics and Mitophagy During Aging. Mol Cell 2019; 73:775-787.e10. [PMID: 30642763 DOI: 10.1016/j.molcel.2018.11.034] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 10/23/2018] [Accepted: 11/27/2018] [Indexed: 12/11/2022]
Abstract
Little information is available about how post-transcriptional mechanisms regulate the aging process. Here, we show that the RNA-binding protein Pumilio2 (PUM2), which is a translation repressor, is induced upon aging and acts as a negative regulator of lifespan and mitochondrial homeostasis. Multi-omics and cross-species analyses of PUM2 function show that it inhibits the translation of the mRNA encoding for the mitochondrial fission factor (Mff), thereby impairing mitochondrial fission and mitophagy. This mechanism is conserved in C. elegans by the PUM2 ortholog PUF-8. puf-8 knock-down in old nematodes and Pum2 CRISPR/Cas9-mediated knockout in the muscles of elderly mice enhances mitochondrial fission and mitophagy in both models, hence improving mitochondrial quality control and tissue homeostasis. Our data reveal how a PUM2-mediated layer of post-transcriptional regulation links altered Mff translation to mitochondrial dynamics and mitophagy, thereby mediating age-related mitochondrial dysfunctions.
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Affiliation(s)
- Davide D'Amico
- Laboratory for Integrative and Systems Physiology, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Adrienne Mottis
- Laboratory for Integrative and Systems Physiology, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Francesca Potenza
- Laboratory for Integrative and Systems Physiology, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Vincenzo Sorrentino
- Laboratory for Integrative and Systems Physiology, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Hao Li
- Laboratory for Integrative and Systems Physiology, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Mario Romani
- Laboratory for Integrative and Systems Physiology, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Vera Lemos
- Laboratory of Metabolic Signaling, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland
| | - Kristina Schoonjans
- Laboratory of Metabolic Signaling, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland
| | - Nicola Zamboni
- Department of Biology, Institute of Molecular Systems Biology, Eidgenössische Technische Hochschule Zürich (ETHZ), CH-8093, Zurich, Switzerland
| | - Graham Knott
- BioEM Facility, Faculty of Life Sciences Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Bernard L Schneider
- Brain Mind Insitute, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Johan Auwerx
- Laboratory for Integrative and Systems Physiology, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
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Ishaq A, Dufour D, Cameron K, von Zglinicki T, Saretzki G. Metabolic memory of dietary restriction ameliorates DNA damage and adipocyte size in mouse visceral adipose tissue. Exp Gerontol 2018; 113:228-236. [PMID: 30312736 DOI: 10.1016/j.exger.2018.10.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 09/24/2018] [Accepted: 10/08/2018] [Indexed: 11/30/2022]
Abstract
Dietary restriction (DR) is thought to exert its beneficial effects on healthspan at least partially by a senolytic and senostatic action, i.e. by reducing frequencies of cells with markers of DNA damage and senescence in multiple tissues. Due to its importance in metabolic and inflammation regulation, fat is a prime tissue for health span determination as well as a prime target for DR. We aimed to determine here whether the beneficial effects of DR would be retained over a subsequent period of ad libitum (AL) feeding. Male mice were kept under either 40% DR or AL feeding regimes from 3 to 12 months of age and then either switched back to the opposite feeding regimen or kept in the same state for another 3 months. Visceral adipose tissue from 4 to 5 mice per group for all conditions was analysed for markers of senescence (adipocyte size, γH2A.X, p16, p21) and inflammation (e.g. IL-6, TNFα, IL-1β) using immuno-staining or qPCR. Macrophages were detected by immunohistochemistry. We found that both 9 and 12 months DR (long term) as well as 3 month (short term, mid-life onset) DR reduced the number of cells harbouring DNA damage and adipocyte size (area and perimeter) in visceral adipocytes with similar efficiency. Importantly, beneficial health markers induced by DR such as small adipocyte size and low DNA damage were maintained for at least 3 month after termination of DR, demonstrating that the previously identified 'metabolic memory' of the DR state in male mice extends to senescence markers in visceral fat.
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Affiliation(s)
- Abbas Ishaq
- The Ageing Biology Centre, Newcastle Institute for Ageing, Institute for Cell and Molecular Biosciences, Campus of Ageing and Vitality, Newcastle upon Tyne, UK
| | - Damien Dufour
- The Ageing Biology Centre, Newcastle Institute for Ageing, Institute for Cell and Molecular Biosciences, Campus of Ageing and Vitality, Newcastle upon Tyne, UK
| | - Kerry Cameron
- The Ageing Biology Centre, Newcastle Institute for Ageing, Institute for Cell and Molecular Biosciences, Campus of Ageing and Vitality, Newcastle upon Tyne, UK
| | - Thomas von Zglinicki
- The Ageing Biology Centre, Newcastle Institute for Ageing, Institute for Cell and Molecular Biosciences, Campus of Ageing and Vitality, Newcastle upon Tyne, UK
| | - Gabriele Saretzki
- The Ageing Biology Centre, Newcastle Institute for Ageing, Institute for Cell and Molecular Biosciences, Campus of Ageing and Vitality, Newcastle upon Tyne, UK.
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42
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AMPK activation negatively regulates GDAP1, which influences metabolic processes and circadian gene expression in skeletal muscle. Mol Metab 2018; 16:12-23. [PMID: 30093355 PMCID: PMC6157647 DOI: 10.1016/j.molmet.2018.07.004] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 06/26/2018] [Accepted: 07/01/2018] [Indexed: 12/31/2022] Open
Abstract
Objective We sought to identify AMPK-regulated genes via bioinformatic analysis of microarray data generated from skeletal muscle of animal models with genetically altered AMPK activity. We hypothesized that such genes would play a role in metabolism. Ganglioside-induced differentiation-associated protein 1 (GDAP1), a gene which plays a role in mitochondrial fission and peroxisomal function in neuronal cells but whose function in skeletal muscle is undescribed, was identified and further validated. AMPK activation reduced GDAP1 expression in skeletal muscle. GDAP1 expression was elevated in skeletal muscle from type 2 diabetic patients but decreased after acute exercise. Methods The metabolic impact of GDAP1 silencing was determined in primary skeletal muscle cells via siRNA-transfections. Confocal microscopy was used to visualize whether silencing GDAP1 impacted mitochondrial network morphology and membrane potential. Results GDAP1 silencing increased mitochondrial protein abundance, decreased palmitate oxidation, and decreased non-mitochondrial respiration. Mitochondrial morphology was unaltered by GDAP1 silencing. GDAP1 silencing and treatment of cells with AMPK agonists altered several genes in the core molecular clock machinery. Conclusion We describe a role for GDAP1 in regulating mitochondrial proteins, circadian genes, and metabolic flux in skeletal muscle. Collectively, our results implicate GDAP1 in the circadian control of metabolism. Transcriptomic studies reveal GDAP1 mRNA is inversely associated with AMPK activity. GDAP1 silencing increases mitochondrial protein abundance in skeletal muscle. GDAP1 silencing influences expression of core molecular clock machinery. GDAP1 is a AMPK target involved in metabolism and circadian gene expression.
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Garcia S, Nissanka N, Mareco EA, Rossi S, Peralta S, Diaz F, Rotundo RL, Carvalho RF, Moraes CT. Overexpression of PGC-1α in aging muscle enhances a subset of young-like molecular patterns. Aging Cell 2018; 17. [PMID: 29427317 PMCID: PMC5847875 DOI: 10.1111/acel.12707] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/31/2017] [Indexed: 12/31/2022] Open
Abstract
PGC‐1α is a transcriptional co‐activator known as the master regulator of mitochondrial biogenesis. Its control of metabolism has been suggested to exert critical influence in the aging process. We have aged mice overexpressing PGC‐1α in skeletal muscle to determine whether the transcriptional changes reflected a pattern of expression observed in younger muscle. Analyses of muscle proteins showed that Pax7 and several autophagy markers were increased. In general, the steady‐state levels of several muscle proteins resembled that of muscle from young mice. Age‐related mtDNA deletion levels were not increased by the PGC‐1α‐associated increase in mitochondrial biogenesis. Accordingly, age‐related changes in the neuromuscular junction were minimized by PGC‐1α overexpression. RNA‐Seq showed that several genes overexpressed in the aged PGC‐1α transgenic are expressed at higher levels in young when compared to aged skeletal muscle. As expected, there was increased expression of genes associated with energy metabolism but also of pathways associated with muscle integrity and regeneration. We also found that PGC‐1α overexpression had a mild but significant effect on longevity. Taken together, overexpression of PGC‐1α in aged muscle led to molecular changes that resemble the patterns observed in skeletal muscle from younger mice.
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Affiliation(s)
- Sofia Garcia
- Department of Neurology; University of Miami Miller School of Medicine; Miami FL USA
| | - Nadee Nissanka
- Neuroscience Graduate Program; University of Miami Miller School of Medicine; Miami FL USA
| | - Edson A. Mareco
- Graduate Program in Environment and Regional Development; University of Western São Paulo; Presidente Prudente Brazil
| | - Susana Rossi
- Department of Cell Biology; University of Miami Miller School of Medicine; Miami FL USA
| | - Susana Peralta
- Department of Neurology; University of Miami Miller School of Medicine; Miami FL USA
| | - Francisca Diaz
- Department of Neurology; University of Miami Miller School of Medicine; Miami FL USA
| | - Richard L. Rotundo
- Neuroscience Graduate Program; University of Miami Miller School of Medicine; Miami FL USA
- Department of Cell Biology; University of Miami Miller School of Medicine; Miami FL USA
| | - Robson F. Carvalho
- Institute of Biosciences; São Paulo State University (UNESP); Botucatu Brazil
| | - Carlos T. Moraes
- Department of Neurology; University of Miami Miller School of Medicine; Miami FL USA
- Neuroscience Graduate Program; University of Miami Miller School of Medicine; Miami FL USA
- Department of Cell Biology; University of Miami Miller School of Medicine; Miami FL USA
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Parikh N, Shuck RL, Gagea M, Shen L, Donehower LA. Enhanced inflammation and attenuated tumor suppressor pathways are associated with oncogene-induced lung tumors in aged mice. Aging Cell 2018; 17. [PMID: 29047229 PMCID: PMC5771401 DOI: 10.1111/acel.12691] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/11/2017] [Indexed: 01/09/2023] Open
Abstract
Aging is often accompanied by a dramatic increase in cancer susceptibility. To gain insights into how aging affects tumor susceptibility, we generated a conditional mouse model in which oncogenic KrasG12D was activated specifically in lungs of young (3–5 months) and old (19–24 months) mice. Activation of KrasG12D in old mice resulted in shorter survival and development of higher‐grade lung tumors. Six weeks after KrasG12D activation, old lung tissues contained higher numbers of adenomas than their young tissue counterparts. Lung tumors in old mice displayed higher proliferation rates, as well as attenuated DNA damage and p53 tumor suppressor responses. Gene expression comparison of lung tumors from young and old mice revealed upregulation of extracellular matrix‐related genes in young tumors, indicative of a robust cancer‐associated fibroblast response. In old tumors, numerous inflammation‐related genes such as Ccl7,IL‐1β, Cxcr6, and IL‐15ra were consistently upregulated. Increased numbers of immune cells were localized around the periphery of lung adenomas from old mice. Our experiments indicate that more aggressive lung tumor formation in older KrasG12D mice may be in part the result of subdued tumor suppressor and DNA damage responses, an enhanced inflammatory milieu, and a more accommodating tissue microenvironment.
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Affiliation(s)
- Neha Parikh
- Department of Molecular Virology and Microbiology; Baylor College of Medicine; Houston TX 77030 USA
| | - Ryan L. Shuck
- Department of Molecular Virology and Microbiology; Baylor College of Medicine; Houston TX 77030 USA
| | - Mihai Gagea
- Department of Veterinary Medicine and Surgery; UT MD Anderson Cancer Center; Houston TX 77030 USA
| | - Lanlan Shen
- Children's Nutrition Research Center; Houston TX 77030 USA
| | - Lawrence A. Donehower
- Department of Molecular Virology and Microbiology; Baylor College of Medicine; Houston TX 77030 USA
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Sánchez-Rodríguez C, Cuadrado E, Riestra-Ayora J, Sanz-Fernández R. Polyphenols protect against age-associated apoptosis in female rat cochleae. Biogerontology 2018; 19:159-169. [PMID: 29363005 DOI: 10.1007/s10522-018-9747-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 01/18/2018] [Indexed: 01/13/2023]
Abstract
Dietary antioxidants, polyphenols, have been found to be beneficial in protecting against the generation of oxidative stress in various diseases associated with aging. Age-related hearing loss (AHL) is the number one neurodegenerative disorder on our aged population. Sprague-Dawley rats divided into five groups according to their age (3, 6, 12, 18 and 24 months old) and treated with 100 mg/day/kg body weight of polyphenols were used. Then, cochleae were harvested to measure caspase activities (- 3, - 8 and - 9), caspase-3 gene expression, ATP levels, Bax, BcL-2 and p53 levels. 8-OHdG levels (marker of DNA oxidative damage) and annexin-V were also measured in cochleae. Increased levels of caspase-3 and 9 in cochlea were observed with age and this effect was attenuated by polyphenol treatment. In addition, ATP and Bcl-2 levels in older rats were recovered after administration of polyphenols, while Bax and p53 levels protein decreased. Oral supplementation with polyphenols also reduces DNA oxidative damage of cochlear cell. Treatment with polyphenols inhibits the activation of age-related apoptotic signaling by decreasing oxidative stress inside the rat cochlea.
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Affiliation(s)
| | - Esperanza Cuadrado
- Department of biochemistry, University Hospital of Getafe, Carretera de Toledo, km 12, Getafe, 500, Madrid, Spain
| | - Juan Riestra-Ayora
- European University of Madrid, Calle del Tajo S/N, Villaviciosa de Odón, 28670, Madrid, Spain
- Department of Otolaryngology, University Hospital of Getafe, Carretera de Toledo, km 12, Getafe, 500, Madrid, Spain
| | - Ricardo Sanz-Fernández
- European University of Madrid, Calle del Tajo S/N, Villaviciosa de Odón, 28670, Madrid, Spain
- Department of Otolaryngology, University Hospital of Getafe, Carretera de Toledo, km 12, Getafe, 500, Madrid, Spain
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Abstract
Background: p53 is a tumor suppressor protein involved in regulating a wide array of signaling pathways. The role of p53 in the cell is determined by the type of imposed oxidative stress, its intensity and duration. The last decade of research has unravelled a dual nature in the function of p53 in mediating the oxidative stress burden. However, this is dependent on the specific properties of the applied stress and thus requires further analysis. Methods: A systematic review was performed following an electronic search of Pubmed, Google Scholar, and ScienceDirect databases. Articles published in the English language between January 1, 1990 and March 1, 2017 were identified and isolated based on the analysis of p53 in skeletal muscle in both animal and cell culture models. Results: Literature was categorized according to the modality of imposed oxidative stress including exercise, diet modification, exogenous oxidizing agents, tissue manipulation, irradiation, and hypoxia. With low to moderate levels of oxidative stress, p53 is involved in activating pathways that increase time for cell repair, such as cell cycle arrest and autophagy, to enhance cell survival. However, with greater levels of stress intensity and duration, such as with irradiation, hypoxia, and oxidizing agents, the role of p53 switches to facilitate increased cellular stress levels by initiating DNA fragmentation to induce apoptosis, thereby preventing aberrant cell proliferation. Conclusion: Current evidence confirms that p53 acts as a threshold regulator of cellular homeostasis. Therefore, within each modality, the intensity and duration are parameters of the oxidative stressor that must be analyzed to determine the role p53 plays in regulating signaling pathways to maintain cellular health and function in skeletal muscle. Abbreviations: Acadl: acyl-CoA dehydrogenase, long chain; Acadm: acyl-CoA dehydrogenase, C-4 to C-12 straight chain; AIF: apoptosis-inducing factor; Akt: protein kinase B (PKB); AMPK: AMP-activated protein kinase; ATF-4: activating transcription factor 4; ATM: ATM serine/threonine kinase; Bax: BCL2 associated X, apoptosis regulator; Bcl-2: B cell Leukemia/Lymphoma 2 apoptosis regulator; Bhlhe40: basic helix-loop-helix family member e40; BH3: Borane; Bim: bcl-2 interacting mediator of cell death; Bok: Bcl-2 related ovarian killer; COX-IV: cytochrome c oxidase IV; cGMP: Cyclic guanosine monophosphate; c-myc: proto-oncogene protein; Cpt1b: carnitine palmitoyltransferase 1B; Dr5: death receptor 5; eNOS: endothelial nitric oxide synthase; ERK: extracellular regulated MAP kinase; Fas: Fas Cell surface death receptor; FDXR: Ferredoxin Reductase; FOXO3a: forkhead box O3; Gadd45a: growth arrest and DNA damage-inducible 45 alpha; GLS2: glutaminase 2; GLUT 1 and 4: glucose transporter 1(endothelial) and 4 (skeletal muscle); GSH: Glutathione; Hes1: hes family bHLH transcription factor 1; Hey1: hes related family bHLH transcription factor with YRPW motif 1; HIFI-α: hypoxia-inducible factor 1, α-subunit; HK2: Hexokinase 2; HSP70: Heat Shock Protein 70; H2O2: Hydrogen Peroxide; Id2: inhibitor of DNA-binding 2; IGF-1-BP3: Insulin-like growth factor binding protein 3; IL-1β: Interleukin 1 beta; iNOS: inducible nitric oxide synthase; IRS-1: Insulin receptor substrate 1; JNK: c-Jun N-terminal kinases; LY-83583: 6-anilino-5,8-quinolinedione; inhibitor of soluble guanylate cyclase and of cGMP production; Mdm 2/ 4: Mouse double minute 2 homolog (mouse) Mdm4 (humans); mtDNA: mitochondrial DNA; MURF1: Muscle RING-finger protein-1; MyoD: Myogenic differentiation 1; MyoG: myogenin; Nanog: Nanog homeobox; NF-kB: Nuclear factor-κB; NO: nitric oxide; NoxA: phorbol-12-myristate-13-acetate-induced protein 1 (Pmaip1); NRF-1: nuclear respiratory factor 1; Nrf2: Nuclear factor erythroid 2-related factor 2; P21: Cdkn1a cyclin-dependent kinase inhibitor 1A (P21); P38 MAPK: mitogen-activated protein kinases; p53R2: p53 inducible ribonucleotide reductase gene; P66Shc: src homology 2 domain-containing transforming protein C1; PERP: p53 apoptosis effector related to PMP-22; PGC-1α: Peroxisome proliferator-activated receptor gamma coactivator 1-alpha; PGM: phosphoglucomutase; PI3K: Phosphatidylinositol-4,5-bisphosphate 3-kinase; PKCβ: protein kinase c beta; PTEN: phosphatase and tensin homolog; PTIO: 2-phenyl-4, 4, 5, 5,-tetramethylimidazoline-1-oxyl 3-oxide (PTIO) has been used as a nitric oxide (NO) scavenger; Puma: The p53 upregulated modulator of apoptosis; PW1: paternally expressed 3 (Peg3); RNS: Reactive nitrogen species; SIRT1: sirtuin 1; SCO2: cytochrome c oxidase assembly protein; SOD2: superoxide dismutase 2; Tfam: transcription factor A mitochondrial; TIGAR: Trp53 induced glycolysis repulatory phosphatase; TNF-a: tumor necrosis factor a; TRAF2: TNF receptor associated factor 2; TRAIL: type II transmembrane protein.
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Affiliation(s)
- Kaitlyn Beyfuss
- a School of Kinesiology and Health Sciences , York University , Toronto , Canada
| | - David A Hood
- a School of Kinesiology and Health Sciences , York University , Toronto , Canada
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Ishaq A, Schröder J, Edwards N, von Zglinicki T, Saretzki G. Dietary Restriction Ameliorates Age-Related Increase in DNA Damage, Senescence and Inflammation in Mouse Adipose Tissuey. J Nutr Health Aging 2018; 22:555-561. [PMID: 29582897 PMCID: PMC5866821 DOI: 10.1007/s12603-017-0968-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 07/11/2017] [Indexed: 12/11/2022]
Abstract
Ageing is associated with redistribution of fat around the body and saturation of visceral adipose depots. Likewise, the presence of excess fat in obesity or during ageing places extra stress on visceral depots, resulting in chronic inflammation and increased senescence. This process can contribute to the establishment of the metabolic syndrome and accelerated ageing. Dietary restriction (DR) is known to alleviate physiological signs of inflammation, ageing and senescence in various tissues including adipose tissue. OBJECTIVES Our pilot study aimed to analyse senescence and inflammation parameters in mouse visceral fat tissue during ageing and by short term, late-onset dietary restriction as a nutritional intervention. Design, measurements: In this study we used visceral adipose tissue from mice between 5 and 30 months of age and analysed markers of senescence (adipocyte size, γH2A.X, p16, p21) and inflammation (e.g. IL-6, TNFα, IL-1β, macrophage infiltration) using immuno-staining, as well as qPCR for gene expression analysis. Fat tissues from 3 mice per group were analysed. RESULTS We found that the amount of γH2A.X foci as well as the expression of senescence and inflammation markers increased during ageing but decreased with short term DR. In contrast, the increase in amounts of single or aggregated macrophages in fat depots occurred only at higher ages. Surprisingly, we also found that adipocyte size as well as some senescence parameters decreased at very high age (30 months). CONCLUSIONS Our results demonstrate increased senescence and inflammation during ageing in mouse visceral fat while DR was able to ameliorate several of these parameters as well as increased adipocyte size at 17.5 months of age. This highlights the health benefits of a decreased nutritional intake over a relatively short period of time at middle age.
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Affiliation(s)
- A Ishaq
- Dr. Gabriele Saretzki, The Ageing Biology Centre and Institute for Cell and Molecular Biosciences, Campus for Ageing and Vitality, Edwardson Building, Newcastle upon Tyne, NE4 5PL, United Kingdom, Phone: 0044 191 208 1214, Fax: 0044 191 208 1101,
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Altered S-nitrosylation of p53 is responsible for impaired antioxidant response in skeletal muscle during aging. Aging (Albany NY) 2017; 8:3450-3467. [PMID: 28025407 PMCID: PMC5270679 DOI: 10.18632/aging.101139] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Accepted: 11/29/2016] [Indexed: 01/01/2023]
Abstract
p53 transcriptional activity has been proposed to regulate both homeostasis and sarcopenia of skeletal muscle during aging. However, the exact molecular function of p53 remains to be clearly defined. We demonstrated a requirement of nuclear p53 S-nitrosylation in inducing a nitric oxide/PGC-1α-mediated antioxidant pathway in skeletal muscle. Importantly, mutant form of p53-DNA binding domain (C124S) did not undergo nuclear S-nitrosylation and failed in inducing the expression of antioxidant genes (i.e. SOD2 and GCLC). Moreover, we found that during aging the nuclear S-nitrosylation of p53 significantly declines in gastrocnemius/soleus leading to an impairment of redox homeostasis of skeletal muscle. We suggested that decreased level of nuclear neuronal nitric oxide synthase (nNOS)/Syntrophin complex, which we observed during aging, could be responsible for impaired nuclear S-nitrosylation. Taken together, our data indicate that altered S-nitrosylation of p53 during aging could be a contributing factor of sarcopenia condition and of other skeletal muscle pathologies associated with oxidative/nitrosative stress.
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Impact of Aging and Exercise on Mitochondrial Quality Control in Skeletal Muscle. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:3165396. [PMID: 28656072 PMCID: PMC5471566 DOI: 10.1155/2017/3165396] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 05/03/2017] [Indexed: 12/17/2022]
Abstract
Mitochondria are characterized by its pivotal roles in managing energy production, reactive oxygen species, and calcium, whose aging-related structural and functional deteriorations are observed in aging muscle. Although it is still unclear how aging alters mitochondrial quality and quantity in skeletal muscle, dysregulation of mitochondrial biogenesis and dynamic controls has been suggested as key players for that. In this paper, we summarize current understandings on how aging regulates muscle mitochondrial biogenesis, while focusing on transcriptional regulations including PGC-1α, AMPK, p53, mtDNA, and Tfam. Further, we review current findings on the muscle mitochondrial dynamic systems in aging muscle: fusion/fission, autophagy/mitophagy, and protein import. Next, we also discuss how endurance and resistance exercises impact on the mitochondrial quality controls in aging muscle, suggesting possible effective exercise strategies to improve/maintain mitochondrial health.
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Der Sarkissian S, Lévesque T, Noiseux N. Optimizing stem cells for cardiac repair: Current status and new frontiers in regenerative cardiology. World J Stem Cells 2017; 9:9-25. [PMID: 28154736 PMCID: PMC5253186 DOI: 10.4252/wjsc.v9.i1.9] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 09/20/2016] [Accepted: 10/24/2016] [Indexed: 02/06/2023] Open
Abstract
Cell therapy has the potential to improve healing of ischemic heart, repopulate injured myocardium and restore cardiac function. The tremendous hope and potential of stem cell therapy is well understood, yet recent trials involving cell therapy for cardiovascular diseases have yielded mixed results with inconsistent data thereby readdressing controversies and unresolved questions regarding stem cell efficacy for ischemic cardiac disease treatment. These controversies are believed to arise by the lack of uniformity of the clinical trial methodologies, uncertainty regarding the underlying reparative mechanisms of stem cells, questions concerning the most appropriate cell population to use, the proper delivery method and timing in relation to the moment of infarction, as well as the poor stem cell survival and engraftment especially in a diseased microenvironment which is collectively acknowledged as a major hindrance to any form of cell therapy. Indeed, the microenvironment of the failing heart exhibits pathological hypoxic, oxidative and inflammatory stressors impairing the survival of transplanted cells. Therefore, in order to observe any significant therapeutic benefit there is a need to increase resilience of stem cells to death in the transplant microenvironment while preserving or better yet improving their reparative functionality. Although stem cell differentiation into cardiomyocytes has been observed in some instance, the prevailing reparative benefits are afforded through paracrine mechanisms that promote angiogenesis, cell survival, transdifferentiate host cells and modulate immune responses. Therefore, to maximize their reparative functionality, ex vivo manipulation of stem cells through physical, genetic and pharmacological means have shown promise to enable cells to thrive in the post-ischemic transplant microenvironment. In the present work, we will overview the current status of stem cell therapy for ischemic heart disease, discuss the most recurring cell populations employed, the mechanisms by which stem cells deliver a therapeutic benefit and strategies that have been used to optimize and increase survival and functionality of stem cells including ex vivo preconditioning with drugs and a novel “pharmaco-optimizer” as well as genetic modifications.
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