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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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Jeong JS, Kim JW, Kim JH, Kim CY, Ko JW, Kim TW. Korean red ginseng suppresses mitochondrial apoptotic pathway in denervation-induced skeletal muscle atrophy. J Ginseng Res 2024; 48:52-58. [PMID: 38223821 PMCID: PMC10785417 DOI: 10.1016/j.jgr.2023.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 06/08/2023] [Accepted: 07/01/2023] [Indexed: 01/16/2024] Open
Abstract
Background Skeletal muscle denervation leads to motor neuron degeneration, which in turn reduces muscle fiber volumes. Recent studies have revealed that apoptosis plays a role in regulating denervation-associated pathologic muscle wasting. Korean red ginseng (KRG) has various biological activities and is currently widely consumed as a medicinal product worldwide. Among them, ginseng has protective effects against muscle atrophy in in vivo and in vitro. However, the effects of KRG on denervation-induced muscle damage have not been fully elucidated. Methods We induced skeletal muscle atrophy in mice by dissecting the sciatic nerves, administered KRG, and then analyzed the muscles. KRG was administered to the mice once daily for 3 weeks at 100 and 400 mg/kg/day doses after operation. Results KRG treatment significantly increased skeletal muscle weight and tibialis anterior (TA) muscle fiber volume in injured areas and reduced histological alterations in TA muscle. In addition, KRG treatment reduced denervation-induced apoptotic changes in TA muscle. KRG attenuated p53/Bax/cytochrome c/Caspase 3 signaling induced by nerve injury in a dose-dependent manner. Also, KRG decreases protein kinase B/mammalian target of rapamycin pathway, reducing restorative myogenesis. Conclusion Thus, KRG has potential protective role against denervation-induced muscle atrophy. The effect of KRG treatment was accompanied by reduced levels of mitochondria-associated apoptosis.
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Affiliation(s)
- Ji-Soo Jeong
- College of Veterinary Medicine (BK21 FOUR Program), Chungnam National University, Daejeon, Republic of Korea
| | - Jeong-Won Kim
- College of Veterinary Medicine (BK21 FOUR Program), Chungnam National University, Daejeon, Republic of Korea
| | - Jin-Hwa Kim
- College of Veterinary Medicine (BK21 FOUR Program), Chungnam National University, Daejeon, Republic of Korea
| | - Chang-Yeop Kim
- College of Veterinary Medicine (BK21 FOUR Program), Chungnam National University, Daejeon, Republic of Korea
| | - Je-Won Ko
- College of Veterinary Medicine (BK21 FOUR Program), Chungnam National University, Daejeon, Republic of Korea
| | - Tae-Won Kim
- College of Veterinary Medicine (BK21 FOUR Program), Chungnam National University, Daejeon, Republic of Korea
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de Oliveira AK, Pramoonjago P, Rucavado A, Moskaluk C, Silva DT, Escalante T, Gutiérrez JM, Fox JW. Mapping the Immune Cell Microenvironment with Spatial Profiling in Muscle Tissue Injected with the Venom of Daboia russelii. Toxins (Basel) 2023; 15:toxins15030208. [PMID: 36977099 PMCID: PMC10057198 DOI: 10.3390/toxins15030208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 02/26/2023] [Accepted: 03/06/2023] [Indexed: 03/12/2023] Open
Abstract
Pathological and inflammatory events in muscle after the injection of snake venoms vary in different regions of the affected tissue and at different time intervals. In order to study such heterogeneity in the immune cell microenvironment, a murine model of muscle necrosis based on the injection of the venom of Daboia russelii was used. Histological and immunohistochemical methods were utilized to identify areas in muscle tissue with a different extent of muscle cell damage, based on the presence of hypercontracted muscle cells, a landmark of necrosis, and on the immunostaining for desmin. A gradient of inflammatory cells (neutrophils and macrophages) was observed from heavily necrotic areas to less damaged and non-necrotic areas. GeoMx® Digital Spatial Profiler (NanoString, Seattle, WA, USA) was used for assessing the presence of markers of various immune cells by comparing high-desmin (nondamaged) and low-desmin (damaged) regions of muscle. Markers of monocytes, macrophages, M2 macrophages, dendritic cells, neutrophils, leukocyte adhesion and migration markers, and hematopoietic precursor cells showed higher levels in low-desmin regions, especially in samples collected 24 hr after venom injection, whereas several markers of lymphocytes did not. Moreover, apoptosis (BAD) and extracellular matrix (fibronectin) markers were also increased in low-desmin regions. Our findings reveal a hitherto-unknown picture of immune cell microheterogeneity in venom-injected muscle which greatly depends on the extent of muscle cell damage and the time lapse after venom injection.
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Affiliation(s)
- Ana K. de Oliveira
- School of Medicine, University of Virginia, Charlottesville, VA 22908, USA
| | | | - Alexandra Rucavado
- Instituto Clodomiro Picado, Facultad de Microbiología, Universidad de Costa Rica, San José 11501, Costa Rica
| | | | - Dilza T. Silva
- School of Medicine, University of Virginia, Charlottesville, VA 22908, USA
| | - Teresa Escalante
- Instituto Clodomiro Picado, Facultad de Microbiología, Universidad de Costa Rica, San José 11501, Costa Rica
| | - José María Gutiérrez
- Instituto Clodomiro Picado, Facultad de Microbiología, Universidad de Costa Rica, San José 11501, Costa Rica
| | - Jay W. Fox
- School of Medicine, University of Virginia, Charlottesville, VA 22908, USA
- Correspondence:
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Srivastava A, Singla DK. PTEN-AKT pathway attenuates apoptosis and adverse remodeling in ponatinib-induced skeletal muscle toxicity following BMP-7 treatment. Physiol Rep 2023; 11:e15629. [PMID: 36945866 PMCID: PMC10031244 DOI: 10.14814/phy2.15629] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/30/2023] [Accepted: 02/06/2023] [Indexed: 03/23/2023] Open
Abstract
Tyrosine kinase inhibitors (TKIs) including ponatinib are commonly used to treat cancer patients. Unfortunately, TKIs induce cardiac as well as skeletal muscle dysfunction as a side effect. Therefore, detailed mechanistic studies are required to understand its pathogenesis and to develop a therapeutic treatment. The current study was undertaken to examine whether ponatinib induces apoptosis and apoptotic mechanisms both in vitro and in vivo models and furthermore to test the potential of bone morphogenetic protein 7 (BMP-7) as a possible treatment option for its attenuation. Sol8 cells, a mouse myogenic cell line was exposed to ponatinib to generate an apoptotic cell culture model and were subsequently treated with BMP-7 to understand its protective effects. For the in vivo model, C57BL/6J mice were administered with ponatinib to understand apoptosis, cell signaling apoptotic mechanisms, and adverse muscle remodeling and its attenuation with BMP-7. TUNEL staining, immunohistochemistry (IHC), and real-time polymerase chain reaction (RT-PCR) methods were used. Our data show significantly (p < 0.05) increased TUNEL staining, caspase-3, BAX/Bcl2 ratio in the in vitro model. Furthermore, our in vivo muscle data show ponatinib-induced muscle myopathy, and loss in muscle function. The observed muscle myopathy was associated with increased apoptosis, caspase-3 staining, and BAX/Bcl-2 ratio as confirmed with IHC and RT-PCR. Furthermore, our data show a significant (p < 0.05) increase in the involvement of cell signaling apoptotic regulator protein PTEN and a decrease in cell survival protein AKT. These results suggest that increased apoptosis following ponatinib treatment showed an increase in skeletal muscle remodeling, sarcopenia, and fibrosis. Furthermore, BMP-7 treatment significantly (p < 0.05) attenuated ponatinib-induced apoptosis, BAX/Bcl2 ratio, decreased PTEN, and increased cell survival protein AKT, decreased adverse muscle remodeling, and improved muscle function. Overall, we provide evidence that ponatinib-induces apoptosis leading to sarcopenia and muscle myopathy with decreased function which was attenuated by BMP-7.
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Affiliation(s)
- Ayushi Srivastava
- Division of Metabolic and Cardiovascular Sciences, Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
| | - Dinender K Singla
- Division of Metabolic and Cardiovascular Sciences, Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
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Ni PS, Ma S, Wang ZZ, He JH, Zhang CK, Li BM, Yu XM, Li FH. Indirect regulation of HIPPO pathway by miRNA mediates high-intensity intermittent exercise to ameliorate aging skeletal muscle function. Scand J Med Sci Sports 2023; 33:834-847. [PMID: 36789636 DOI: 10.1111/sms.14338] [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: 10/10/2022] [Revised: 01/20/2023] [Accepted: 01/27/2023] [Indexed: 02/16/2023]
Abstract
Exercise-induced microRNA (miRNA) and HIPPO pathways participate in the regulation of skeletal muscle plasticity but their underlying mechanisms remain unclear. We aimed to investigate the effect of high-intensity interval training (HIIT) on miRNA expression and the HIPPO pathway in the skeletal muscle of aging rats to determine its role in the amelioration of muscle aging. Thirty-six 18-month-old female rats were randomly divided into sedentary control (SED, n = 12), moderate-intensity continuous training (MICT, n = 12), and HIIT (n = 12) groups, with continuous exercise for 8 months. Quantitative reverse transcription-polymerase chain reaction, immunoblotting, KEGG enrichment, and dual-luciferase assays were performed on the target skeletal muscle. Compared with the SED group, the MICT and HIIT groups showed a significant trend of improvement in Lee's index and grip strength and a marked increase in skeletal muscle mitochondrial function, apoptosis, antioxidant, and lipolysis-related protein expression. They also exhibited PI3K/AKT pathway activation and a decrease in expression of HIPPO pathway-related proteins; 20 miRNAs were differentially expressed and enriched in the exercise group compared with the SED group, including the HIPPO pathway and metabolic pathways. Further analysis of L6 cells confirmed that miR-182 may target PTEN, which indirectly regulates HIPPO signaling, but not Mob1. the combined application of HIIT and MICT increased the antioxidant and lipolytic capacities of skeletal muscle and improved atrophy of aging skeletal muscle; HIIT was more effective than MICT. This may be related to HIIT-mediated AKT pathway activation and HIPPO pathway inhibition by miRNAs (miR-486 and miR-182).
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Affiliation(s)
- Pin-Shi Ni
- School of Sport Sciences, Nanjing Normal University, Nanjing, China
| | - Song Ma
- School of Sport Sciences, Nanjing Normal University, Nanjing, China
| | - Zhuang-Zhi Wang
- School of Sport Sciences, Nanjing Normal University, Nanjing, China
| | - Jia-Han He
- School of Sport Sciences, Nanjing Normal University, Nanjing, China
| | - Chen-Kai Zhang
- School of Sport Sciences, Nanjing Normal University, Nanjing, China
| | - Bo-Ming Li
- School of Sport Sciences, Nanjing Normal University, Nanjing, China
| | - Xiao-Ming Yu
- Shanghai Seventh People's Hospital, Shanghai, China
| | - Fang-Hui Li
- School of Sport Sciences, Nanjing Normal University, Nanjing, China.,School of Sport Sciences, Zhaoqing University, Zhaoqing, China
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Kim JY, Kim HM, Kim JH, Guo S, Lee DH, Lim GM, Kim W, Kim CY. Salvia plebeia R.Br. and Rosmarinic Acid Attenuate Dexamethasone-Induced Muscle Atrophy in C2C12 Myotubes. Int J Mol Sci 2023; 24:ijms24031876. [PMID: 36768200 PMCID: PMC9915874 DOI: 10.3390/ijms24031876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/13/2023] [Accepted: 01/16/2023] [Indexed: 01/21/2023] Open
Abstract
Skeletal muscle atrophy occurs when protein degradation exceeds protein synthesis and is associated with increased circulating glucocorticoid levels. Salvia plebeia R.Br. (SPR) has been used as herbal remedy for a variety of inflammatory diseases and has various biological actions such as antioxidant and anti-inflammatory activities. However, there are no reports on the effects of SPR and its bioactive components on muscle atrophy. Herein, we investigated the anti-atrophic effect of SPR and rosmarinic acid (RosA), a major compound of SPR, on dexamethasone (DEX)-induced skeletal muscle atrophy in C2C12 myotubes. Myotubes were treated with 10 μM DEX in the presence or absence of SPR or RosA at different concentrations for 24 h and subjected to immunocytochemistry, western blot, and measurements of ROS and ATP levels. SPR and RosA increased viability and inhibited protein degradation in DEX-treated C2C12 myotubes. In addition, RosA promoted the Akt/p70S6K/mTOR pathway and reduced ROS production, and apoptosis. Furthermore, the treatment of RosA significantly recovered SOD activity, autophagy activity, mitochondrial contents, and APT levels in DEX-treated myotubes. These findings suggest that SPR and RosA may provide protective effects against DEX-induced muscle atrophy and have promising potential as a nutraceutical remedy for the treatment of muscle weakness and atrophy.
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Affiliation(s)
| | | | | | | | | | | | - Wondong Kim
- Correspondence: (W.K.); (C.Y.K.); Tel.: +82-31-400-5817 (W.K.); +82-31-400-5809 (C.Y.K.); Fax: +82-31-400-5958 (C.Y.K.)
| | - Chul Young Kim
- Correspondence: (W.K.); (C.Y.K.); Tel.: +82-31-400-5817 (W.K.); +82-31-400-5809 (C.Y.K.); Fax: +82-31-400-5958 (C.Y.K.)
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Moustogiannis A, Philippou A, Zevolis E, Taso OS, Giannopoulos A, Chatzigeorgiou A, Koutsilieris M. Effect of Mechanical Loading of Senescent Myoblasts on Their Myogenic Lineage Progression and Survival. Cells 2022; 11:cells11243979. [PMID: 36552743 PMCID: PMC9776690 DOI: 10.3390/cells11243979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 11/30/2022] [Accepted: 12/03/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND During aging, muscle cell apoptosis increases and myogenesis gradually declines. The impaired myogenic and survival potential of the aged skeletal muscle can be ameliorated by its mechanical loading. However, the molecular responses of aged muscle cells to mechanical loading remain unclear. This study examined the effect of mechanical loading of aged, proliferating, and differentiated myoblasts on the gene expression and signaling responses associated with their myogenic lineage progression and survival. METHODS Control and aged C2C12 cells were cultured on elastic membranes and underwent passive stretching for 12 h at a low frequency (0.25 Hz) and different elongations, varying the strain on days 0 and 10 of myoblast differentiation. Activation of ERK1/2 and Akt, and the expression of focal adhesion kinase (FAK) and key myogenic regulatory factors (MRFs), MyoD and Myogenin, were determined by immunoblotting of the cell lysates derived from stretched and non-stretched myoblasts. Changes in the expression levels of the MRFs, muscle growth, atrophy, and pro-apoptotic factors in response to mechanical loading of the aged and control cells were quantified by real-time qRT-PCR. RESULTS Mechanical stretching applied on myoblasts resulted in the upregulation of FAK both in proliferating (day 0) and differentiated (day 10) cells, as well as in increased phosphorylation of ERK1/2 in both control and aged cells. Moreover, Akt activation and the expression of early differentiation factor MyoD increased significantly after stretching only in the control myoblasts, while the late differentiation factor Myogenin was upregulated in both the control and aged myoblasts. At the transcriptional level, mechanical loading of the proliferating myoblasts led to an increased expression of IGF-1 isoforms and MRFs, and to downregulation of muscle atrophy factors mainly in control cells, as well as in the upregulation of pro-apoptotic factors both in control and aged cells. In differentiated cells, mechanical loading resulted in an increased expression of the IGF-1Ea isoform and Myogenin, and in the downregulation of atrophy and pro-apoptotic factors in both the control and aged cells. CONCLUSIONS This study revealed a diminished beneficial effect of mechanical loading on the myogenic and survival ability of the senescent muscle cells compared with the controls, with a low strain (2%) loading being most effective in upregulating myogenic/anabolic factors and downregulating atrophy and pro-apoptotic genes mainly in the aged myotubes.
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Affiliation(s)
- Athanasios Moustogiannis
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 Micras Asias, 115 27 Athens, Greece
| | - Anastassios Philippou
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 Micras Asias, 115 27 Athens, Greece
| | - Evangelos Zevolis
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 Micras Asias, 115 27 Athens, Greece
| | - Orjona S. Taso
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 Micras Asias, 115 27 Athens, Greece
- School of Biological Sciences, Deanery of Biomedical Sciences, Centre for Discovery Brain Sciences, Edinburgh EH8 9JZ, UK
| | - Antonios Giannopoulos
- Department of Surgical and Perioperative Sciences, Faculty of Medicine, Umeå University, 901 87 Umeå, Sweden
| | - Antonios Chatzigeorgiou
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 Micras Asias, 115 27 Athens, Greece
| | - Michael Koutsilieris
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, 75 Micras Asias, 115 27 Athens, Greece
- Correspondence: ; Tel.: +30-210-7462690; Fax: +30-210-7462571
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Mechanisms of Estrogen Influence on Skeletal Muscle: Mass, Regeneration, and Mitochondrial Function. Sports Med 2022; 52:2853-2869. [PMID: 35907119 DOI: 10.1007/s40279-022-01733-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/24/2022] [Indexed: 10/16/2022]
Abstract
Human menopause is widely associated with impaired skeletal muscle quality and significant metabolic dysfunction. These observations pose significant challenges to the quality of life and mobility of the aging population, and are of relevance when considering the significantly greater losses in muscle mass and force-generating capacity of muscle from post-menopausal females relative to age-matched males. In this regard, the influence of estrogen on skeletal muscle has become evident across human, animal, and cell-based studies. Beneficial effects of estrogen have become apparent in mitigation of muscle injury and enhanced post-damage repair via various mechanisms, including prophylactic effects on muscle satellite cell number and function, as well as membrane stability and potential antioxidant influences following injury, exercise, and/or mitochondrial stress. In addition to estrogen replacement in otherwise deficient states, exercise has been found to serve as a means of augmenting and/or mimicking the effects of estrogen on skeletal muscle function in recent literature. Detailed mechanisms behind the estrogenic effect on muscle mass, strength, as well as the injury response are beginning to be elucidated and point to estrogen-mediated molecular cross talk amongst signalling pathways, such as apoptotic signaling, contractile protein modifications, including myosin regulatory light chain phosphorylation, and the maintenance of muscle satellite cells. This review discusses current understandings and highlights new insights regarding the role of estrogen in skeletal muscle, with particular regard to muscle mass, mitochondrial function, the response to muscle damage, and the potential implications for human physiology and mobility.
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Paeoniflorin Alleviates Skeletal Muscle Atrophy in Ovariectomized Mice through the ERα/NRF1 Mitochondrial Biogenesis Pathway. Pharmaceuticals (Basel) 2022; 15:ph15040390. [PMID: 35455387 PMCID: PMC9025649 DOI: 10.3390/ph15040390] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 03/10/2022] [Accepted: 03/21/2022] [Indexed: 12/13/2022] Open
Abstract
Muscle atrophy in postmenopausal women is caused by estrogen deficiency and a variety of inflammatory factors, including tumor necrosis factor alpha (TNFα). Paeoniflorin (PNF), a natural compound with anti-inflammatory properties, improves estradiol synthesis. Here, we demonstrate that PNF inhibits the progression of TNFα-induced skeletal muscle atrophy after menopause by restoring mitochondrial biosynthesis. Differentiated myoblasts damaged by TNFα were restored by PNF, as evident by the increase in the expression of myogenin (MyoG) and myosin heavy chain 3 (Myh3)—the markers of muscle differentiation. Moreover, diameter of atrophied myotubes was restored by PNF treatment. TNFα-repressed nuclear respiratory factor 1 (NRF1) and mitochondrial transcription factor A (TFAM) (a major regulator of mitochondrial biosynthesis) were restored by PNF, via regulation by estrogen receptor alpha (ERα), an upregulator of NRF1. This mechanism was confirmed in ovariectomized (OVX) mice with a ~40% reduction in the cross-sectional area of the anterior tibialis muscle. OVX mice administered PNF (100, 300 mg/kg/day) for 12 weeks recovered more than ~20%. Behavioral, rotarod, and inverted screen tests showed that PNF enhances reduced muscle function in OVX mice. ERα restored expression of mitofusin 1 (MFN1) and mitofusin 2 (MFN2) (mitochondrial fusion markers) and dynamin-related protein (DRP1) and fission 1 (FIS1) (mitochondrial fission markers). Therefore, PNF can prevent muscle atrophy in postmenopausal women by inhibiting dysfunctional mitochondrial biogenesis.
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Huang H, Xue J, Zheng J, Tian H, Fang Y, Wang W, Wang G, Hou D, Lin J. Bioinformatic analysis of the gene expression profile in muscle atrophy after spinal cord injury. Sci Rep 2021; 11:21903. [PMID: 34754020 PMCID: PMC8578571 DOI: 10.1038/s41598-021-01302-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 10/26/2021] [Indexed: 01/13/2023] Open
Abstract
Spinal cord injury (SCI) is often accompanied by muscle atrophy; however, its underlying mechanisms remain unclear. Here, the molecular mechanisms of muscle atrophy following SCI were investigated. The GSE45550 gene expression profile of control (before SCI) and experimental (14 days following SCI) groups, consisting of Sprague–Dawley rat soleus muscle (n = 6 per group), was downloaded from the Gene Expression Omnibus database, and then differentially expressed gene (DEG) identification and Gene Ontology, pathway, pathway network, and gene signal network analyses were performed. A total of 925 differentially expressed genes, 149 biological processes, and 55 pathways were screened. In the pathway network analysis, the 10 most important pathways were citrate cycle (TCA cycle), pyruvate metabolism, MAPK signalling pathway, fatty acid degradation, propanoate metabolism, apoptosis, focal adhesion, synthesis and degradation of ketone bodies, Wnt signalling, and cancer pathways. In the gene signal network analysis, the 10 most important genes were Acat1, Acadvl, Acaa2, Hadhb, Acss1, Oxct1, Hadha, Hadh, Acaca, and Cpt1b. Thus, we screened the key genes and pathways that may be involved in muscle atrophy after SCI and provided support for finding valuable markers for this disease.
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Affiliation(s)
- Hui Huang
- Department of Sports Medicine, Hainan General Hospital (Hainan Affiliated Hospital of Hainan Medical University), Haikou, 570311, Hainan, China
| | - Jinju Xue
- Department of Geriatrics, Affiliated Haikou Hospital, Central South University Xiangya School of Medicine, Haikou, 570208, Hainan, China
| | - Jiaxuan Zheng
- Department of Pathology, Hainan General Hospital (Hainan Affiliated Hospital of Hainan Medical University), Haikou, 570311, Hainan, China
| | - Haiquan Tian
- Department of Orthopaedic Surgery, The Second People's Hospital of Changzhi, Changzhi, 046000, Shanxi, China
| | - Yehan Fang
- Department of Sports Medicine, Hainan General Hospital (Hainan Affiliated Hospital of Hainan Medical University), Haikou, 570311, Hainan, China
| | - Wei Wang
- Department of Emergency, Hainan General Hospital (Hainan Affiliated Hospital of Hainan Medical University), Haikou, 570311, Hainan, China
| | - Guangji Wang
- Department of Sports Medicine, Hainan General Hospital (Hainan Affiliated Hospital of Hainan Medical University), Haikou, 570311, Hainan, China
| | - Dan Hou
- Department of Neurology, Affiliated Haikou Hospital, Central South University Xiangya School of Medicine, Haikou, 570208, Hainan, China.
| | - Jianping Lin
- Department of Joint Surgery, Hainan General Hospital (Hainan Affiliated Hospital of Hainan Medical University), Haikou, 570311, Hainan, China.
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De Jesus AD, Jimenez AG. Effects of acute temperature increases on House sparrow (Passer domesticus) pectoralis muscle myonuclear domain. JOURNAL OF EXPERIMENTAL ZOOLOGY PART 2021; 337:150-158. [PMID: 34516707 DOI: 10.1002/jez.2544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 08/25/2021] [Accepted: 09/01/2021] [Indexed: 11/09/2022]
Abstract
With rapid climate change, heat wave episodes have become more intense and more frequent. This poses a significant threat to animals, and forces them to manage these physiologically challenging conditions by adapting and/or moving. As an invasive species with a large niche breadth, House sparrows (Passer domesticus) exhibit high phenotypic flexibility that caters to seasonal changes in function and metabolism. For example, their pectoral muscle complex exhibits size and mass plasticity with winter and summer acclimation. Here, we investigated the effects of acute whole-organism heat stress to 43°C on cellular-level changes in House sparrow pectoralis muscle myonuclear domain (MND), the volumetric portion each nucleus is responsible for, that have gone overlooked in the current literature. House sparrows were separated into a control group, a heat-shocked group subjected to thermal stress at 43°C for 24 h, and a recovery group that was returned to room temperature for 24 h after experiencing the same temperature treatment. Here, we found that heat-shocked and recovery groups demonstrated a decrease in number of nuclei per millimeter of fiber and increase in MND, when compared with the control. We also found a significant positive correlation between fiber diameter and MND in the recovery group, suggesting the possibility that nuclei number constrains the extent of muscle fiber size. Together, these results show that acute heat shock alters House sparrow pectoralis muscle cellular physiology in a rigid way that could prove detrimental to long-term muscle integrity and performance.
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Gielen E, Beckwée D, Delaere A, De Breucker S, Vandewoude M, Bautmans I. Nutritional interventions to improve muscle mass, muscle strength, and physical performance in older people: an umbrella review of systematic reviews and meta-analyses. Nutr Rev 2021; 79:121-147. [PMID: 32483625 DOI: 10.1093/nutrit/nuaa011] [Citation(s) in RCA: 93] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
CONTEXT Sarcopenia is a progressive and generalized skeletal muscle disorder associated with an increased risk of adverse outcomes such as falls, disability, and death. The Belgian Society of Gerontology and Geriatrics has developed evidence-based guidelines for the prevention and treatment of sarcopenia. This umbrella review presents the results of the Working Group on Nutritional Interventions. OBJECTIVE The aim of this umbrella review was to provide an evidence-based overview of nutritional interventions targeting sarcopenia or at least 1 of the 3 sarcopenia criteria (ie, muscle mass, muscle strength, or physical performance) in persons aged ≥ 65 years. DATA SOURCES Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, the PubMed and Web of Science databases were searched for systematic reviews and meta-analyses reporting the effect of nutritional supplementation on sarcopenia or muscle mass, strength, or physical performance. DATA EXTRACTION Two authors extracted data on the key characteristics of the reviews, including participants, treatment, and outcomes. Methodological quality of the reviews was assessed using the product A Measurement Tool to Assess Systematic Reviews. Three authors synthesized the extracted data and generated recommendations on the basis of an overall synthesis of the effects of each intervention. Quality of evidence was rated with the Grading of Recommendations Assessment, Development and Evaluation approach. DATA ANALYSIS A total of 15 systematic reviews were included. The following supplements were examined: proteins, essential amino acids, leucine, β-hydroxy-β-methylbutyrate, creatine, and multinutrient supplementation (with or without physical exercise). Because of both the low amount and the low to moderate quality of the reviews, the level of evidence supporting most recommendations was low to moderate. CONCLUSIONS Best evidence is available to recommend leucine, because it has a significant effect on muscle mass in elderly people with sarcopenia. Protein supplementation on top of resistance training is recommended to increase muscle mass and strength, in particular for obese persons and for ≥ 24 weeks. Effects on sarcopenia as a construct were not reported in the included reviews.
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Affiliation(s)
- Evelien Gielen
- Department of Geriatrics, UZ Leuven, Leuven, Belgium.,Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium
| | - David Beckwée
- Rehabilitation Sciences Research Department, Vrije Universiteit Brussel, Brussels, Belgium.,Frailty in Ageing Research Department, Vrije Universiteit Brussel, Brussels, Belgium.,Department of Gerontology, Vrije Universiteit Brussel, Brussels, Belgium.,Department of Rehabilitation Sciences and Physiotherapy, University of Antwerp, Antwerp, Belgium.,Department of Geriatric Physiotherapy, SOMT University of Physiotherapy, Amersfoort, The Netherlands
| | - Andreas Delaere
- Frailty in Ageing Research Department, Vrije Universiteit Brussel, Brussels, Belgium.,Department of Gerontology, Vrije Universiteit Brussel, Brussels, Belgium
| | | | | | - Ivan Bautmans
- Frailty in Ageing Research Department, Vrije Universiteit Brussel, Brussels, Belgium.,Department of Gerontology, Vrije Universiteit Brussel, Brussels, Belgium.,Department of Geriatric Physiotherapy, SOMT University of Physiotherapy, Amersfoort, The Netherlands
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13
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Lacavalla MA, Cisterna B, Zancanaro C, Malatesta M. Ultrastructural immunocytochemistry shows impairment of RNA pathways in skeletal muscle nuclei of old mice: A link to sarcopenia? Eur J Histochem 2021; 65:3229. [PMID: 33764019 PMCID: PMC8033527 DOI: 10.4081/ejh.2021.3229] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 03/15/2021] [Indexed: 12/12/2022] Open
Abstract
During aging, skeletal muscle is affected by sarcopenia, a progressive decline in muscle mass, strength and endurance that leads to loss of function and disability. Cell nucleus dysfunction is a possible factor contributing to sarcopenia because aging-associated alterations in mRNA and rRNA transcription/maturation machinery have been shown in several cell types including muscle cells. In this study, the distribution and density of key molecular factors involved in RNA pathways namely, nuclear actin (a motor protein and regulator of RNA transcription), 5-methyl cytosine (an epigenetic regulator of gene transcription), and ribonuclease A (an RNA degrading enzyme) were compared in different nuclear compartments of late adult and old mice myonuclei by means of ultrastructural immunocytochemistry. In all nuclear compartments, an age-related decrease of nuclear actin suggested altered chromatin structuring and impaired nucleus-to-cytoplasm transport of both mRNA and ribosomal subunits, while a decrease of 5-methyl cytosine and ribonuclease A in the nucleoli of old mice indicated an age-dependent loss of rRNA genes. These findings provide novel experimental evidence that, in the aging skeletal muscle, nuclear RNA pathways undergo impairment, likely hindering protein synthesis and contributing to the onset and progression of sarcopenia.
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Affiliation(s)
| | - Barbara Cisterna
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona.
| | - Carlo Zancanaro
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona.
| | - Manuela Malatesta
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona.
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14
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Mahmoud MAA, Saleh DO, Safar MM, Agha AM, Khattab MM. Chloroquine ameliorates bone loss induced by d-galactose in male rats via inhibition of ERK associated osteoclastogenesis and antioxidant effect. Toxicol Rep 2021; 8:366-375. [PMID: 33665135 PMCID: PMC7905189 DOI: 10.1016/j.toxrep.2021.02.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 02/11/2021] [Accepted: 02/11/2021] [Indexed: 12/13/2022] Open
Abstract
Cloroquine (CQ) has reduced the adverse bone changes caused by d-galactose. It improved bone health, switched off nuclear factor kappa-B ligand (RANKL) receptor activator activation and decreased ERK bone expression. CQ treatment inhibited osteoclastogenesis and consequently restored the RANKL/OPG ratio. CQ demonstrated an antioxidant effect in bone where it increased both catalase (CAT) and superoxide dismutase (SOD). CQ is a possible anti-osteoporotic agent through the suppression of osteoclastogenesis associated with ERK.
Chloroquine (CQ); a lysosomotropic agent used for decade ago as anti-malarial, was tested against aging induced osteoporosis. Osteoporosis in male rats was induced using d-galactose (D-gal) as a reducing sugar at a dose of 200 mg/kg/day; i.p. Osteoporotic rats were orally treated with CQ (10 mg/kg/day) for four successive weeks. Bone densitometry of tibia and femur were evaluated. Bone formation biomarkers; osteoprotegrin (OPG), bone specific alkaline phosphatse (BALP), and osteocalcin (OCN), and bone resorption biomarker; receptor activator of nuclear factor kappa-B ligand (RANKL), cathepsin-k (CTSK), tartrate-resistant acid phosphatase (TRAP) were estimated. Moreover, the expression of extracellular regulated kinase (ERK) in bone was determined. CQ ameliorated the bone detrimental changes induced by d-galactose. It enhanced bone health as revealed by measurement of bone densitometry, halted the activation of receptor activator of nuclear factor kappa-B ligand (RANKL) and reduced bone manifestation of ERK. Furthermore, CQ treatment abated serum cathepsin-k (CTSK) and serum tartrate-resistant acid phosphatase (TRAP) thus inhibited osteoclastogenesis and consequently restored the RANKL/OPG ratio. CQ demonstrated an antioxidant effect in bone where it increased both Catalase (CAT) and Superoxide dismutase (SOD). These CQ preserving effect in rats treated with d-galactose were confirmed by the histopathological examination. The present study points to the potential therapeutic effect of CQ as anti-osteoporotic agent possibly through its antioxidant effects and suppression of ERK associated osteoclastogenesis.
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Affiliation(s)
| | - Dalia O Saleh
- Department of Pharmacology, Medical Division, National Research Centre, Giza, Egypt
| | - Marwa M Safar
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Cairo, Egypt.,Department of Pharmacology and Biochemistry, Faculty of Pharmacy, The British University in Egypt, Egypt
| | - Azza M Agha
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Mahmoud M Khattab
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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15
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Zager Y, Khalilieh S, Ganaiem O, Gorgov E, Horesh N, Anteby R, Kopylov U, Jacoby H, Dreznik Y, Dori A, Gutman M, Nevler A. Low psoas muscle area is associated with postoperative complications in Crohn's disease. Int J Colorectal Dis 2021; 36:543-550. [PMID: 33236229 DOI: 10.1007/s00384-020-03799-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/10/2020] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND AIMS Crohn's disease (CD) is associated with increased postoperative morbidity. Sarcopenia correlates with increased morbidity and mortality in various medical conditions. We assessed correlations of the lean body mass marker and psoas muscle area (PMA), with postoperative outcomes in CD patients undergoing gastrointestinal surgery. METHODS We included patients with CD who underwent gastrointestinal surgery between June 2009 and October 2018 and had CT/MRI scans within 8 weeks preoperatively. PMA was measured bilaterally on perioperative imaging. RESULTS Of 121 patients, the mean age was 35.98 ± 15.07 years; 51.2% were male. The mean BMI was 21.56 ± 4 kg/m2. The mean PMA was 95.12 ± 263.2cm2. Patients with postoperative complications (N = 31, 26%) had significantly lower PMA compared with patients with a normal postoperative recovery (8.5 ± 2.26 cm2 vs. 9.85 ± 2.68 cm2, P = 0.02). A similar finding was noted comparing patients with anastomotic leaks to those without anastomotic leaks (7.48 ± 0.1 cm2 vs. 9.6 ± 2.51 cm2, P = 0.04). PMA correlated with the maximum degree of complications per patient, according to the Clavien-Dindo classification (Spearman's coefficient = -0.26, P = 0.004). Patients with major postoperative complications (Clavien-Dindo ≥ 3) had lower mean PMA (8.12 ± 2.75 cm2 vs. 9.71 ± 2.57 cm2, P = 0.03). Associations were similar when stratifying by gender and operation urgency. On multivariate analysis, PMA (HR = 0.72/cm2, P = 0.02), operation urgency (HR = 3.84, P < 0.01), and higher white blood cell count (HR = 1.14, P = 0.02) were independent predictive factors for postoperative complications. CONCLUSION PMA is an easily measured radiographic parameter associated with postoperative complications in patients with CD undergoing bowel resection.
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Affiliation(s)
- Yaniv Zager
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel. .,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Saed Khalilieh
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel.,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Omar Ganaiem
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel.,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Eli Gorgov
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel.,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Nir Horesh
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel.,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Roi Anteby
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel.,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Uri Kopylov
- Department of Gastroenterology, Sheba Medical Center, Ramat-Gan, and Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Harel Jacoby
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel.,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Yael Dreznik
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel.,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Assaf Dori
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel.,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Mordechai Gutman
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel
| | - Avinoam Nevler
- Department of General Surgery and Transplantations, Sheba Medical Center, Tel HaShomer, Israel.,Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Department of Surgery, Thomas Jefferson University, Philadelphia, PA, USA
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16
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Snijders T, Aussieker T, Holwerda A, Parise G, Loon LJC, Verdijk LB. The concept of skeletal muscle memory: Evidence from animal and human studies. Acta Physiol (Oxf) 2020; 229:e13465. [PMID: 32175681 PMCID: PMC7317456 DOI: 10.1111/apha.13465] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 03/05/2020] [Accepted: 03/10/2020] [Indexed: 12/18/2022]
Abstract
Within the current paradigm of the myonuclear domain theory, it is postulated that a linear relationship exists between muscle fibre size and myonuclear content. The myonuclear domain is kept (relatively) constant by adding additional nuclei (supplied by muscle satellite cells) during muscle fibre hypertrophy and nuclear loss (by apoptosis) during muscle fibre atrophy. However, data from recent animal studies suggest that myonuclei that are added to support muscle fibre hypertrophy are not lost within various muscle atrophy models. Such myonuclear permanence has been suggested to constitute a mechanism allowing the muscle fibre to (re)grow more efficiently during retraining, a phenomenon referred to as "muscle memory." The concept of "muscle memory by myonuclear permanence" has mainly been based on data attained from rodent experimental models. Whether the postulated mechanism also holds true in humans remains largely ambiguous. Nevertheless, there are several studies in humans that provide evidence to potentially support or contradict (parts of) the muscle memory hypothesis. The goal of the present review was to discuss the evidence for the existence of "muscle memory" in both animal and human models of muscle fibre hypertrophy as well as atrophy. Furthermore, to provide additional insight in the potential presence of muscle memory by myonuclear permanence in humans, we present new data on previously performed exercise training studies. Finally, suggestions for future research are provided to establish whether muscle memory really exists in humans.
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Affiliation(s)
- Tim Snijders
- Department of Human Biology NUTRIM School of Nutrition and Translational Research in Metabolism Maastricht University Maastricht the Netherlands
| | - Thorben Aussieker
- Department of Human Biology NUTRIM School of Nutrition and Translational Research in Metabolism Maastricht University Maastricht the Netherlands
| | - Andy Holwerda
- Department of Human Biology NUTRIM School of Nutrition and Translational Research in Metabolism Maastricht University Maastricht the Netherlands
| | - Gianni Parise
- Department of Kinesiology and Medical Physics & Applied Radiation Sciences McMaster University Hamilton ON Canada
| | - Luc J. C. Loon
- Department of Human Biology NUTRIM School of Nutrition and Translational Research in Metabolism Maastricht University Maastricht the Netherlands
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17
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Kidera H, Hatabu T, Takahashi KH. Apoptosis inhibition mitigates aging effects in Drosophila melanogaster. Genetica 2020; 148:69-76. [PMID: 32219590 DOI: 10.1007/s10709-020-00088-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 02/14/2020] [Indexed: 11/30/2022]
Abstract
Aging is a natural biological process that results in progressive loss of cell, tissue, and organ function. One of the causing factors of the aging process is the decrease in muscle mass, which has not been fully verified in Drosophila. Apoptotic cell death may result in aberrant cell loss and can eventually diminish tissue function and muscle atrophy. If so, inhibition of apoptosis may prolong longevity and reduce motor function and muscle mass decline with age in Drosophila flies. Here, we used Drosophila melanogaster as study material, and induced the overexpression of Drosophila inhibitor of apoptosis protein 1 gene to inhibit apoptosis, and investigated the effect of apoptosis inhibition on the longevity and age-related declines in flight and climbing ability and muscle mass. As a result, the inhibition of apoptosis tended to mitigate the aging effects and prolonged longevity and reduced climbing ability decline with age. The current study suggests that apoptosis inhibition could mitigate the aging effects in D. melanogaster. Although such effects have already been known in mammals, the current results suggest that the apoptosis may play a similar role in insects as well.
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Affiliation(s)
- Hiroaki Kidera
- Graduate School of Environmental Science, Okayama University, Tsushima-naka 1-1-1, Kita-ku, Okayama, 700-8530, Japan
| | - Toshimitsu Hatabu
- Graduate School of Environmental Science, Okayama University, Tsushima-naka 1-1-1, Kita-ku, Okayama, 700-8530, Japan
| | - Kazuo H Takahashi
- Graduate School of Environmental Science, Okayama University, Tsushima-naka 1-1-1, Kita-ku, Okayama, 700-8530, Japan.
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18
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Yoshikawa M, Hosokawa M, Miyashita K, Fujita T, Nishino H, Hashimoto T. Fucoxanthinol attenuates oxidative stress-induced atrophy and loss in myotubes and reduces the triacylglycerol content in mature adipocytes. Mol Biol Rep 2020; 47:2703-2711. [PMID: 32180086 DOI: 10.1007/s11033-020-05369-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 03/04/2020] [Indexed: 02/06/2023]
Abstract
The combination of sarcopenia and obesity (i.e., sarcopenic obesity) is more strongly associated with disability and metabolic/cardiovascular diseases than obesity or sarcopenia alone. Therefore, countermeasures that simultaneously suppress fat gain and muscle atrophy to prevent an increase in sarcopenic obesity are warranted. The aim of this study was to investigate the simultaneous effects of fucoxanthinol (FXOH) on fat loss in mature adipocytes and the inhibition of atrophy and loss in myotubes induced by oxidative stress. C2C12 myotubes were treated with FXOH for 24 h and further incubated with hydrogen peroxide (H2O2) for 24 h. The area of myosin heavy chain-positive myotubes and the ROS concentration were measured. Mature 3T3-L1 adipocytes were treated with FXOH for 72 h. The triacylglycerol (TG) content and glycerol and fatty acid (FA) release were biochemically measured. The myotube area was smaller in H2O2-treated cells than that in control cells. However, FXOH protected against the H2O2-induced decreases in myotube area. Further, the ROS concentration was significantly higher in the FXOH-treated cells compared with that in the control cells, although it was significantly lower than that in the H2O2-treated cells. On the other hand, in the mature adipocytes, the TG content was significantly decreased by FXOH treatment compared to that in the control. Moreover, FXOH treatment significantly increased glycerol and FA release compared with that of the control. These results suggest that FXOH inhibits H2O2-induced atrophy and loss in myotubes and activates lipolysis and decreases the TG content in mature adipocytes. Accordingly, FXOH has the potential to exert anti-sarcopenic obesity effects.
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Affiliation(s)
- Maki Yoshikawa
- Faculty of Sport and Health Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-8577, Japan
| | - Masashi Hosokawa
- Faculty of Fisheries Sciences, Hokkaido University, Hokkaido, Japan
| | - Kazuo Miyashita
- Faculty of Fisheries Sciences, Hokkaido University, Hokkaido, Japan
| | - Takashi Fujita
- Faculty of Pharmaceutical Sciences, Ritsumeikan University, Shiga, Japan
| | | | - Takeshi Hashimoto
- Faculty of Sport and Health Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-8577, Japan.
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19
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Abrigo J, Marín T, Aguirre F, Tacchi F, Vilos C, Simon F, Arrese M, Cabrera D, Cabello-Verrugio C. N-Acetyl Cysteine Attenuates the Sarcopenia and Muscle Apoptosis Induced by Chronic Liver Disease. Curr Mol Med 2019; 20:60-71. [DOI: 10.2174/1566524019666190917124636] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 08/12/2019] [Accepted: 08/29/2019] [Indexed: 12/18/2022]
Abstract
Background:
Sarcopenia is characterized by the loss of muscle mass and
strength (muscle atrophy) because of aging or chronic diseases, such as chronic liver
disease (CLD). Different mechanisms are involved in skeletal muscle atrophy, including
decreased muscle fibre diameter and myosin heavy chain levels and increased
ubiquitin–proteasome pathway activity, oxidative stress and myonuclear apoptosis. We
recently found that all these mechanisms, except myonuclear apoptosis, which was not
evaluated in the previous study, were involved in muscle atrophy associated with
hepatotoxin 5-diethoxycarbonyl-1,4-dihydrocollidine (DDC)-induced CLD.
Objective:
In the present study, we evaluated the involvement of myonuclear apoptosis
in CLD-associated sarcopenia and the effect of N-acetyl cysteine (NAC) treatment on
muscle strength and apoptosis, using a DDC-supplemented diet-fed mouse model.
Methods:
Four-month-old male C57BL6 mice were fed with a standard or DDCsupplemented
diet for six weeks in the absence or presence of NAC treatment.
Results:
Our results showed that NAC attenuated the decrease in muscle fibre diameter
and muscle strength associated with CLD-induced muscle wasting in gastrocnemius
(GA) muscle of DDC-supplemented diet-fed mice. In addition, in GA muscle of the mice
fed with DDC-supplemented diet-induced CLD showed increased myonuclear apoptosis
compared with the GA muscle of the control diet-fed mice, as evidenced by increased
apoptotic nuclei number, caspase-8 and caspase-9 expression, enzymatic activity of
caspase-3 and BAX/BCL-2 ratio. NAC treatment inhibited all the mechanisms
associated with myonuclear apoptosis in the GA muscle.
Conclusion:
To our knowledge, this is the first study which reports the redox regulation
of muscle strength and myonuclear apoptosis in CLD-induced sarcopenia.
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Affiliation(s)
- Johanna Abrigo
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
| | - Tabita Marín
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
| | - Francisco Aguirre
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
| | - Franco Tacchi
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
| | - Cristian Vilos
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
| | - Felipe Simon
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile
| | - Marco Arrese
- Departamento de Gastroenterologia, Facultad de Medicina. Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - Daniel Cabrera
- Departamento de Gastroenterologia, Facultad de Medicina. Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - Claudio Cabello-Verrugio
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
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20
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Abrigo J, Simon F, Cabrera D, Vilos C, Cabello-Verrugio C. Mitochondrial Dysfunction in Skeletal Muscle Pathologies. Curr Protein Pept Sci 2019; 20:536-546. [PMID: 30947668 DOI: 10.2174/1389203720666190402100902] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 03/20/2019] [Accepted: 03/21/2019] [Indexed: 12/26/2022]
Abstract
Several molecular mechanisms are involved in the regulation of skeletal muscle function. Among them, mitochondrial activity can be identified. The mitochondria is an important and essential organelle in the skeletal muscle that is involved in metabolic regulation and ATP production, which are two key elements of muscle contractibility and plasticity. Thus, in this review, we present the critical and recent antecedents regarding the mechanisms through which mitochondrial dysfunction can be involved in the generation and development of skeletal muscle pathologies, its contribution to detrimental functioning in skeletal muscle and its crosstalk with other typical signaling pathways related to muscle diseases. In addition, an update on the development of new strategies with therapeutic potential to inhibit the deleterious impact of mitochondrial dysfunction in skeletal muscle is discussed.
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Affiliation(s)
- Johanna Abrigo
- Laboratory of Muscle Pathology, Fragility and Aging, Departamento de Ciencias Biologicas, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile.,Millennium Institute on Immunology and Immunotherapy, Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
| | - Felipe Simon
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile.,Laboratory of Integrative Physiopathology, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Daniel Cabrera
- Departamento de Gastroenterologia, Facultad de Medicina, Pontificia Universidad Catolica de Chile, Santiago, Chile.,Departamento de Ciencias Químicas y Biológicas, Facultad de Salud, Universidad Bernardo O Higgins, Santiago, Chile
| | - Cristian Vilos
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile.,Laboratory of Nanomedicine and Targeted Delivery, Center for Medical Research, School of Medicine. Universidad d e Talca, Talca, Chile
| | - Claudio Cabello-Verrugio
- Laboratory of Muscle Pathology, Fragility and Aging, Departamento de Ciencias Biologicas, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile.,Millennium Institute on Immunology and Immunotherapy, Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
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21
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Tang H, Inoki K, Brooks SV, Okazawa H, Lee M, Wang J, Kim M, Kennedy CL, Macpherson PCD, Ji X, Van Roekel S, Fraga DA, Wang K, Zhu J, Wang Y, Sharp ZD, Miller RA, Rando TA, Goldman D, Guan K, Shrager JB. mTORC1 underlies age-related muscle fiber damage and loss by inducing oxidative stress and catabolism. Aging Cell 2019; 18:e12943. [PMID: 30924297 PMCID: PMC6516169 DOI: 10.1111/acel.12943] [Citation(s) in RCA: 93] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 01/15/2019] [Accepted: 02/03/2019] [Indexed: 12/15/2022] Open
Abstract
Aging leads to skeletal muscle atrophy (i.e., sarcopenia), and muscle fiber loss is a critical component of this process. The mechanisms underlying these age-related changes, however, remain unclear. We show here that mTORC1 signaling is activated in a subset of skeletal muscle fibers in aging mouse and human, colocalized with fiber damage. Activation of mTORC1 in TSC1 knockout mouse muscle fibers increases the content of morphologically abnormal mitochondria and causes progressive oxidative stress, fiber damage, and fiber loss over the lifespan. Transcriptomic profiling reveals that mTORC1's activation increases the expression of growth differentiation factors (GDF3, 5, and 15), and of genes involved in mitochondrial oxidative stress and catabolism. We show that increased GDF15 is sufficient to induce oxidative stress and catabolic changes, and that mTORC1 increases the expression of GDF15 via phosphorylation of STAT3. Inhibition of mTORC1 in aging mouse decreases the expression of GDFs and STAT3's phosphorylation in skeletal muscle, reducing oxidative stress and muscle fiber damage and loss. Thus, chronically increased mTORC1 activity contributes to age-related muscle atrophy, and GDF signaling is a proposed mechanism.
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Affiliation(s)
- Huibin Tang
- Division of Thoracic Surgery, Department of Cardiothoracic SurgeryStanford University School of MedicineStanfordCalifornia,VA Palo Alto Healthcare SystemPalo AltoCalifornia
| | - Ken Inoki
- Life Science InstituteUniversity of MichiganAnn ArborMichigan,Department of Molecular and Integrative PhysiologyUniversity of MichiganAnn ArborMichigan
| | - Susan V. Brooks
- Department of Molecular and Integrative PhysiologyUniversity of MichiganAnn ArborMichigan
| | - Hideki Okazawa
- Department of Pharmacology and Moores Cancer CenterUniversity of California San DiegoLa JollaCalifornia
| | - Myung Lee
- Division of Thoracic Surgery, Department of Cardiothoracic SurgeryStanford University School of MedicineStanfordCalifornia,VA Palo Alto Healthcare SystemPalo AltoCalifornia
| | - Junying Wang
- Life Science InstituteUniversity of MichiganAnn ArborMichigan
| | - Michael Kim
- Division of Thoracic Surgery, Department of Cardiothoracic SurgeryStanford University School of MedicineStanfordCalifornia,VA Palo Alto Healthcare SystemPalo AltoCalifornia
| | - Catherine L. Kennedy
- Division of Thoracic Surgery, Department of Cardiothoracic SurgeryStanford University School of MedicineStanfordCalifornia,VA Palo Alto Healthcare SystemPalo AltoCalifornia
| | - Peter C. D. Macpherson
- Molecular and Behavioral Neuroscience Institute and Department of Biological ChemistryUniversity of MichiganAnn ArborMichigan
| | - Xuhuai Ji
- Human Immune Monitoring Center, Stanford University School of MedicineStanfordCalifornia
| | - Sabrina Van Roekel
- Department of Pathology and Geriatrics CenterUniversity of MichiganAnn ArborMichigan
| | - Danielle A. Fraga
- Division of Thoracic Surgery, Department of Cardiothoracic SurgeryStanford University School of MedicineStanfordCalifornia,VA Palo Alto Healthcare SystemPalo AltoCalifornia
| | - Kun Wang
- Division of Thoracic Surgery, Department of Cardiothoracic SurgeryStanford University School of MedicineStanfordCalifornia,VA Palo Alto Healthcare SystemPalo AltoCalifornia,Present address:
The Department of Thoracic SurgeryThird Affiliated Hospital of Kunming Medical UniversityKunmingChina
| | - Jinguo Zhu
- Division of Thoracic Surgery, Department of Cardiothoracic SurgeryStanford University School of MedicineStanfordCalifornia,VA Palo Alto Healthcare SystemPalo AltoCalifornia,Present address:
Department of Cardiothoracic SurgeryGuangxi International Zhuang Hospital of GuangXi University of Chinese MedicineNanNingChina
| | - Yoyo Wang
- Division of Thoracic Surgery, Department of Cardiothoracic SurgeryStanford University School of MedicineStanfordCalifornia,VA Palo Alto Healthcare SystemPalo AltoCalifornia
| | - Zelton D. Sharp
- Department of Molecular MedicineUniversity of Texas Health Science Center at San AntonioSan AntonioTexas
| | - Richard A. Miller
- Department of Pathology and Geriatrics CenterUniversity of MichiganAnn ArborMichigan
| | - Thomas A. Rando
- VA Palo Alto Healthcare SystemPalo AltoCalifornia,Paul F. Glenn Laboratories for the Biology of Aging and Department of Neurology and Neurological SciencesStanford University School of MedicineStanfordCalifornia
| | - Daniel Goldman
- Molecular and Behavioral Neuroscience Institute and Department of Biological ChemistryUniversity of MichiganAnn ArborMichigan
| | - Kun‐Liang Guan
- Department of Pharmacology and Moores Cancer CenterUniversity of California San DiegoLa JollaCalifornia
| | - Joseph B. Shrager
- Division of Thoracic Surgery, Department of Cardiothoracic SurgeryStanford University School of MedicineStanfordCalifornia,VA Palo Alto Healthcare SystemPalo AltoCalifornia
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22
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Faitg J, Leduc-Gaudet JP, Reynaud O, Ferland G, Gaudreau P, Gouspillou G. Effects of Aging and Caloric Restriction on Fiber Type Composition, Mitochondrial Morphology and Dynamics in Rat Oxidative and Glycolytic Muscles. Front Physiol 2019; 10:420. [PMID: 31114501 PMCID: PMC6503296 DOI: 10.3389/fphys.2019.00420] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 03/27/2019] [Indexed: 12/22/2022] Open
Abstract
Aging is associated with a progressive decline in muscle mass and strength, a process known as sarcopenia. Evidence indicates that mitochondrial dysfunction plays a causal role in sarcopenia and suggests that alterations in mitochondrial dynamics/morphology may represent an underlying mechanism. Caloric restriction (CR) is among the most efficient nonpharmacological interventions to attenuate sarcopenia in rodents and is thought to exert its beneficial effects by improving mitochondrial function. However, CR effects on mitochondrial morphology and dynamics, especially in aging muscle, remain unknown. To address this issue, we investigated mitochondrial morphology and dynamics in the oxidative soleus (SOL) and glycolytic white gastrocnemius (WG) muscles of adult (9-month-old) ad libitum-fed (AL; A-AL), old (22-month-old) AL-fed (O-AL), and old CR (O-CR) rats. We show that CR attenuates the aging-related decline in the muscle-to-body-weight ratio, a sarcopenic index. CR also prevented the effects of aging on muscle fiber type composition in both muscles. With aging, the SOL displayed fragmented SubSarcolemmal (SS) and InterMyoFibrillar (IMF) mitochondria, an effect attenuated by CR. Aged WG displayed enlarged SS and more complex/branched IMF mitochondria. CR had marginal anti-aging effects on WG mitochondrial morphology. In the SOL, DRP1 (pro-fission protein) content was higher in O-AL vs YA-AL, and Mfn2 (pro-fusion) content was higher in O-CR vs A-AL. In the gastrocnemius, Mfn2, Drp1, and Fis1 (pro-fission) contents were higher in O-AL vs A-AL. CR reduced this aging-related increase in Mfn2 and Fis1 content. Overall, these results reveal for the first time that aging differentially impacts mitochondrial morphology and dynamics in different muscle fiber types, by increasing fission/fragmentation in oxidative fibers while enhancing mitochondrial size and branching in glycolytic fibers. Our results also indicate that although CR partially attenuates aging-related changes in mitochondrial dynamics in glycolytic fibers, its anti-aging effect on mitochondrial morphology is restricted to oxidative fibers.
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Affiliation(s)
- Julie Faitg
- Département de Biologie, Faculté des Sciences, UQAM, Montreal, QC, Canada.,Groupe de recherche en Activité Physique Adaptée, Montreal, QC, Canada
| | - Jean-Philippe Leduc-Gaudet
- Groupe de recherche en Activité Physique Adaptée, Montreal, QC, Canada.,Meakins-Christie Laboratories, Department of Medicine and Division of Experimental Medicine, McGill University, Montreal, QC, Canada.,Département des sciences de l'activité physique, Faculté des Sciences, UQAM, Montreal, QC, Canada
| | - Olivier Reynaud
- Groupe de recherche en Activité Physique Adaptée, Montreal, QC, Canada.,Département des sciences de l'activité physique, Faculté des Sciences, UQAM, Montreal, QC, Canada
| | - Guylaine Ferland
- Institut de cardiologie de Montréal Research Center, Montreal, QC, Canada.,Department of Nutrition, University of Montreal, Montreal, QC, Canada
| | - Pierrette Gaudreau
- Laboratory of Neuroendocrinology of Aging, Centre Hospitalier de l'Université de Montréal Research Center (CRCHUM), Montreal, QC, Canada.,Department of Medicine,University of Montreal, Montreal, QC, Canada
| | - Gilles Gouspillou
- Groupe de recherche en Activité Physique Adaptée, Montreal, QC, Canada.,Centre de Recherche de l'Institut Universitaire de Gériatrie de Montréal, Montreal, QC, Canada
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23
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microRNA-378 promotes autophagy and inhibits apoptosis in skeletal muscle. Proc Natl Acad Sci U S A 2018; 115:E10849-E10858. [PMID: 30373812 DOI: 10.1073/pnas.1803377115] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The metabolic regulation of cell death is sophisticated. A growing body of evidence suggests the existence of multiple metabolic checkpoints that dictate cell fate in response to metabolic fluctuations. However, whether microRNAs (miRNAs) are able to respond to metabolic stress, reset the threshold of cell death, and attempt to reestablish homeostasis is largely unknown. Here, we show that miR-378/378* KO mice cannot maintain normal muscle weight and have poor running performance, which is accompanied by impaired autophagy, accumulation of abnormal mitochondria, and excessive apoptosis in skeletal muscle, whereas miR-378 overexpression is able to enhance autophagy and repress apoptosis in skeletal muscle of mice. Our in vitro data show that metabolic stress-responsive miR-378 promotes autophagy and inhibits apoptosis in a cell-autonomous manner. Mechanistically, miR-378 promotes autophagy initiation through the mammalian target of rapamycin (mTOR)/unc-51-like autophagy activating kinase 1 (ULK1) pathway and sustains autophagy via Forkhead box class O (FoxO)-mediated transcriptional reinforcement by targeting phosphoinositide-dependent protein kinase 1 (PDK1). Meanwhile, miR-378 suppresses intrinsic apoptosis initiation directly through targeting an initiator caspase-Caspase 9. Thus, we propose that miR-378 is a critical component of metabolic checkpoints, which integrates metabolic information into an adaptive response to reduce the propensity of myocytes to undergo apoptosis by enhancing the autophagic process and blocking apoptotic initiation. Lastly, our data suggest that inflammation-induced down-regulation of miR-378 might contribute to the pathogenesis of muscle dystrophy.
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24
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Ukegbu PO, Kruger HS, Meyer JD, Nienaber-Rousseau C, Botha-Ravyse C, Moss SJ, Kruger MI. The association between calf circumference and appendicular skeletal muscle mass index of black urban women in Tlokwe City. JOURNAL OF ENDOCRINOLOGY METABOLISM AND DIABETES OF SOUTH AFRICA 2018. [DOI: 10.1080/16089677.2018.1518825] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- PO Ukegbu
- Centre of Excellence for Nutrition, North-West University, Potchefstroom, South Africa
- Department of Human Nutrition and Dietetics, Michael Okpara University of Agriculture, Umudike, Nigeria
| | - HS Kruger
- Centre of Excellence for Nutrition, North-West University, Potchefstroom, South Africa
- Medical Research Council Hypertension and Cardiovascular Disease Research Unit, North-West University, Potchefstroom, South Africa
| | - JD Meyer
- Centre of Excellence for Nutrition, North-West University, Potchefstroom, South Africa
| | - C Nienaber-Rousseau
- Centre of Excellence for Nutrition, North-West University, Potchefstroom, South Africa
| | - C Botha-Ravyse
- Centre of Excellence for Nutrition, North-West University, Potchefstroom, South Africa
| | - SJ Moss
- Physical Activity, Sport and Recreation Sciences, North-West University, Potchefstroom, South Africa
| | - MI Kruger
- Africa Unit for Transdisciplinary Health Research, North-West University, Potchefstroom, South Africa
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25
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Bielecka-Dabrowa A, Fabis J, Mikhailidis DP, von Haehling S, Sahebkar A, Rysz J, Banach M. Prosarcopenic Effects of Statins May Limit Their Effectiveness in Patients with Heart Failure. Trends Pharmacol Sci 2018; 39:331-353. [DOI: 10.1016/j.tips.2018.02.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Revised: 02/05/2018] [Accepted: 02/06/2018] [Indexed: 12/25/2022]
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26
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Kletzien H, Hare AJ, Leverson G, Connor NP. Age-related effect of cell death on fiber morphology and number in tongue muscle. Muscle Nerve 2017; 57:E29-E37. [PMID: 28440544 DOI: 10.1002/mus.25671] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 03/30/2017] [Accepted: 04/17/2017] [Indexed: 12/21/2022]
Abstract
INTRODUCTION Multiple pathways may exist for age-related tongue muscle degeneration. Cell death is one mechanism contributing to muscle atrophy and decreased function. We hypothesized with aging, apoptosis, and apoptotic regulators would be increased, and muscle fiber size and number would be reduced in extrinsic tongue muscles. METHODS Cell death indices, expression of caspase-3 and Bcl-2, and measures of muscle morphology and number were determined in extrinsic tongue muscles of young and old rats. RESULTS Significant increases in cell death, caspase-3, and Bcl-2 were observed in all extrinsic tongue muscles along with reductions in muscle fiber number in old rats. DISCUSSION We demonstrated that apoptosis indices increase with age in lingual muscles and that alterations in apoptotic regulators may be associated with age-related degeneration in muscle fiber size and number. These observed apoptotic processes may be detrimental to muscle function, and may contribute to degradation of cranial functions with age. Muscle Nerve 57: E29-E37, 2018.
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Affiliation(s)
- Heidi Kletzien
- University of Wisconsin-Madison, Department of Biomedical Engineering, Madison, Wisconsin, USA
| | - Allison J Hare
- University of Wisconsin School of Medicine and Public Health, Department of Surgery, Madison, Wisconsin, USA
| | - Glen Leverson
- University of Wisconsin School of Medicine and Public Health, Department of Surgery, Madison, Wisconsin, USA
| | - Nadine P Connor
- University of Wisconsin-Madison, Department of Communication Sciences and Disorders, Madison, Wisconsin, USA
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27
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von Haehling S, Ebner N, Dos Santos MR, Springer J, Anker SD. Muscle wasting and cachexia in heart failure: mechanisms and therapies. Nat Rev Cardiol 2017; 14:323-341. [PMID: 28436486 DOI: 10.1038/nrcardio.2017.51] [Citation(s) in RCA: 215] [Impact Index Per Article: 30.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Body wasting is a serious complication that affects a large proportion of patients with heart failure. Muscle wasting, also known as sarcopenia, is the loss of muscle mass and strength, whereas cachexia describes loss of weight. After reaching guideline-recommended doses of heart failure therapies, the most promising approach to treating body wasting seems to be combined therapy that includes exercise, nutritional counselling, and drug treatment. Nutritional considerations include avoiding excessive salt and fluid intake, and replenishment of deficiencies in trace elements. Administration of omega-3 polyunsaturated fatty acids is beneficial in selected patients. High-calorific nutritional supplements can also be useful. The prescription of aerobic exercise training that provokes mild or moderate breathlessness has good scientific support. Drugs with potential benefit in the treatment of body wasting that have been tested in clinical studies in patients with heart failure include testosterone, ghrelin, recombinant human growth hormone, essential amino acids, and β2-adrenergic receptor agonists. In this Review, we summarize the pathophysiological mechanisms of muscle wasting and cachexia in heart failure, and highlight the potential treatment strategies. We aim to provide clinicians with the relevant information on body wasting to understand and treat these conditions in patients with heart failure.
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Affiliation(s)
- Stephan von Haehling
- Department of Cardiology and Pneumology, University of Göttingen Medical Centre and DZHK (German Centre for Cardiovascular Research), Robert-Koch-Strasse 40, D-37075 Göttingen, Germany
| | - Nicole Ebner
- Department of Cardiology and Pneumology, University of Göttingen Medical Centre and DZHK (German Centre for Cardiovascular Research), Robert-Koch-Strasse 40, D-37075 Göttingen, Germany
| | - Marcelo R Dos Santos
- Department of Cardiology and Pneumology, University of Göttingen Medical Centre and DZHK (German Centre for Cardiovascular Research), Robert-Koch-Strasse 40, D-37075 Göttingen, Germany.,Heart Institute (InCor), University of Sao Paulo Medical School, Dr. Arnaldo Avenue, 455 Cerqueira César, 01246903 Sao Paulo, Brazil
| | - Jochen Springer
- Department of Cardiology and Pneumology, University of Göttingen Medical Centre and DZHK (German Centre for Cardiovascular Research), Robert-Koch-Strasse 40, D-37075 Göttingen, Germany
| | - Stefan D Anker
- Department of Cardiology and Pneumology, University of Göttingen Medical Centre and DZHK (German Centre for Cardiovascular Research), Robert-Koch-Strasse 40, D-37075 Göttingen, Germany.,Division of Cardiology and Metabolism: Heart Failure, Cachexia and Sarcopenia, Department of Internal Medicine and Cardiology, Berlin-Brandenburg Centre for Regenerative Therapies, Charité Medical School, Augustenburger Platz 1, 13353 Berlin, Germany
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28
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Seene T, Kaasik P, Seppet E. Changes in Myofibrillar and Mitochondrial Compartments during Increased Activity: Dependance from Oxidative Capacity of Muscle. Health (London) 2017. [DOI: 10.4236/health.2017.95056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Lee G, Lim JY, Frontera WR. Apoptosis in young and old denervated rat skeletal muscle. Muscle Nerve 2016; 55:262-269. [DOI: 10.1002/mus.25221] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/14/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Gangpyo Lee
- Department of Rehabilitation Medicine; Seoul National University Bundang Hospital, Seoul National University College of Medicine; 82, Gumi-ro 173, Bundang-gu, Seongnam-si Gyeonggi-do 13620 Republic of Korea
| | - Jae-Young Lim
- Department of Rehabilitation Medicine; Seoul National University Bundang Hospital, Seoul National University College of Medicine; 82, Gumi-ro 173, Bundang-gu, Seongnam-si Gyeonggi-do 13620 Republic of Korea
| | - Walter R. Frontera
- Department of Physical Medicine and Rehabilitation; Vanderbilt University Medical Center; Nashville Tennessee USA
- Department of Physiology; University of Puerto Rico School of Medicine; San Juan Puerto Rico
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30
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Hashimoto T, Yang B, Okazaki Y, Yoshizawa I, Kajihara K, Kato N, Wada M, Yanaka N. Time Course Analysis of Skeletal Muscle Pathology of GDE5 Transgenic Mouse. PLoS One 2016; 11:e0163299. [PMID: 27658304 PMCID: PMC5033411 DOI: 10.1371/journal.pone.0163299] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 09/07/2016] [Indexed: 12/22/2022] Open
Abstract
Glycerophosphodiesterase 5 (GDE5) selectively hydrolyses glycerophosphocholine to choline and is highly expressed in type II fiber-rich skeletal muscles. We have previously generated that a truncated mutant of GDE5 (GDE5dC471) that lacks phosphodiesterase activity and shown that transgenic mice overexpressing GDE5dC471 in skeletal muscles show less skeletal muscle mass than control mice. However, the molecular mechanism and pathophysiological features underlying decreased skeletal muscle mass in GDE5dC471 mice remain unclear. In this study, we characterized the skeletal muscle disorder throughout development and investigated the primary cause of muscle atrophy. While type I fiber-rich soleus muscle mass was not altered in GDE5dC471 mice, type II fiber-rich muscle mass was reduced in 8-week-old GDE5dC471 mice. Type II fiber-rich muscle mass continued to decrease irreversibly in 1-year-old transgenic mice with an increase in apoptotic cell. Adipose tissue weight and blood triglyceride levels in 8-week-old and 1-year-old transgenic mice were higher than those in control mice. This study also demonstrated compensatory mRNA expression of neuromuscular junction (NMJ) components, including nicotinic acetylcholine receptors (α1, γ, and ε subunits) and acetylcholinesterase in type II fiber-rich quadriceps muscles in GDE5dC471 mice. However, we did not observe morphological changes in NMJs associated with skeletal muscle atrophy in GDE5dC471 mice. We also found that HSP70 protein levels are significantly increased in the skeletal muscles of 2-week-old GDE5dC471 mice and in mouse myoblastic C2C12 cells overexpressing GDE5dC471. These findings suggest that GDE5dC471 mouse is a novel model of early-onset irreversible type II fiber-rich myopathy associated with cellular stress.
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Affiliation(s)
- Takao Hashimoto
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
| | - Bo Yang
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
| | - Yuri Okazaki
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
| | - Ikumi Yoshizawa
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
| | - Kaori Kajihara
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
| | - Norihisa Kato
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
| | - Masanobu Wada
- Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Japan
| | - Noriyuki Yanaka
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
- * E-mail:
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31
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Emodin attenuates TNF-α-induced apoptosis and autophagy in mouse C2C12 myoblasts though the phosphorylation of Akt. Int Immunopharmacol 2016; 34:107-113. [DOI: 10.1016/j.intimp.2016.02.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 02/18/2016] [Accepted: 02/20/2016] [Indexed: 11/18/2022]
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32
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Carter HN, Chen CCW, Hood DA. Mitochondria, muscle health, and exercise with advancing age. Physiology (Bethesda) 2016; 30:208-23. [PMID: 25933821 DOI: 10.1152/physiol.00039.2014] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Skeletal muscle health is dependent on the optimal function of its mitochondria. With advancing age, decrements in numerous mitochondrial variables are evident in muscle. Part of this decline is due to reduced physical activity, whereas the remainder appears to be attributed to age-related alterations in mitochondrial synthesis and degradation. Exercise is an important strategy to stimulate mitochondrial adaptations in older individuals to foster improvements in muscle function and quality of life.
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Affiliation(s)
- Heather N Carter
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - Chris C W Chen
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - David A Hood
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
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33
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Mai M, Jin L, Tian S, Liu R, Huang W, Tang Q, Ma J, Jiang A, Wang X, Hu Y, Wang D, Jiang Z, Li M, Zhou C, Li X. Deciphering the microRNA transcriptome of skeletal muscle during porcine development. PeerJ 2016; 4:e1504. [PMID: 26793416 PMCID: PMC4715453 DOI: 10.7717/peerj.1504] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 11/24/2015] [Indexed: 12/25/2022] Open
Abstract
MicroRNAs (miRNAs) play critical roles in many important biological processes, such as growth and development in mammals. Various studies of porcine muscle development have mainly focused on identifying miRNAs that are important for fetal and adult muscle development; however, little is known about the role of miRNAs in middle-aged muscle development. Here, we present a comprehensive investigation of miRNA transcriptomes across five porcine muscle development stages, including one prenatal and four postnatal stages. We identified 404 known porcine miRNAs, 118 novel miRNAs, and 101 miRNAs that are conserved in other mammals. A set of universally abundant miRNAs was found across the distinct muscle development stages. This set of miRNAs may play important housekeeping roles that are involved in myogenesis. A short time-series expression miner analysis indicated significant variations in miRNA expression across distinct muscle development stages. We also found enhanced differentiation- and morphogenesis-related miRNA levels in the embryonic stage; conversely, apoptosis-related miRNA levels increased relatively later in muscle development. These results provide integral insight into miRNA function throughout pig muscle development stages. Our findings will promote further development of the pig as a model organism for human age-related muscle disease research.
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Affiliation(s)
- Miaomiao Mai
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - Long Jin
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - Shilin Tian
- Novogene Bioinformatics Institute , Beijing , People's Republic of China
| | - Rui Liu
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - Wenyao Huang
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - Qianzi Tang
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - Jideng Ma
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - An'an Jiang
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - Xun Wang
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - Yaodong Hu
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - Dawei Wang
- Novogene Bioinformatics Institute , Beijing , People's Republic of China
| | - Zhi Jiang
- Novogene Bioinformatics Institute , Beijing , People's Republic of China
| | - Mingzhou Li
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
| | - Chaowei Zhou
- Department of Aquaculture, Southwest University at Rongchang , Chongqing , People's Republic of China
| | - Xuewei Li
- College of Animal Science and Technology, Sichuan Agricultural University , Ya'an , People's Republic of China
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34
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YU YONGHUI, CHU WANLI, CHAI JIAKE, LI XIAO, LIU LINGYING, MA LI. Critical role of miRNAs in mediating skeletal muscle atrophy (Review). Mol Med Rep 2015; 13:1470-4. [DOI: 10.3892/mmr.2015.4748] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Accepted: 12/08/2015] [Indexed: 11/05/2022] Open
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35
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Cheema N, Herbst A, McKenzie D, Aiken JM. Apoptosis and necrosis mediate skeletal muscle fiber loss in age-induced mitochondrial enzymatic abnormalities. Aging Cell 2015; 14:1085-93. [PMID: 26365892 PMCID: PMC4693455 DOI: 10.1111/acel.12399] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/20/2015] [Indexed: 01/07/2023] Open
Abstract
Sarcopenia, the age‐induced loss of skeletal muscle mass and function, results from the contributions of both fiber atrophy and loss of myofibers. We have previously characterized sarcopenia in FBN rats, documenting age‐dependent declines in muscle mass and fiber number along with increased fiber atrophy and fibrosis in vastus lateralis and rectus femoris muscles. Concomitant with these sarcopenic changes is an increased abundance of mitochondrial DNA deletion mutations and electron transport chain (ETC) abnormalities. In this study, we used immunohistological and histochemical approaches to define cell death pathways involved in sarcopenia. Activation of muscle cell death pathways was age‐dependent with most apoptotic and necrotic muscle fibers exhibiting ETC abnormalities. Although activation of apoptosis was a prominent feature of electron transport abnormal muscle fibers, necrosis was predominant in atrophic and broken ETC‐abnormal fibers. These data suggest that mitochondrial dysfunction is a major contributor to the activation of cell death processes in aged muscle fibers. The link between ETC abnormalities, apoptosis, fiber atrophy, and necrosis supports the hypothesis that mitochondrial DNA deletion mutations are causal in myofiber loss. These studies suggest a progression of events beginning with the generation and accumulation of a mtDNA deletion mutation, the concomitant development of ETC abnormalities, a subsequent triggering of apoptotic and, ultimately, necrotic events resulting in muscle fiber atrophy, breakage, and fiber loss.
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Affiliation(s)
- Nashwa Cheema
- Department of Biological Sciences Centre for Prions and Protein Folding Diseases University of Alberta Edmonton AB Canada
| | - Allen Herbst
- Department of Agricultural Food and Nutritional Sciences Centre for Prions and Protein Folding Diseases University of Alberta Edmonton AB Canada
| | - Debbie McKenzie
- Department of Biological Sciences Centre for Prions and Protein Folding Diseases University of Alberta Edmonton AB Canada
| | - Judd M. Aiken
- Department of Agricultural Food and Nutritional Sciences Centre for Prions and Protein Folding Diseases University of Alberta Edmonton AB Canada
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36
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Abstract
Sarcopenia (muscle wasting) and cachexia share some pathophysiological aspects. Sarcopenia affects approximately 20 %, cachexia <10 % of ambulatory patients with heart failure (HF). Whilst sarcopenia means loss of skeletal muscle mass and strength that predominantly affects postural rather than non-postural muscles, cachexia means loss of muscle and fat tissue that leads to weight loss. The wasting continuum in HF implies that skeletal muscle is lost earlier than fat tissue and may lead from sarcopenia to cachexia. Both tissues require conservation, and therapies that stop the wasting process have tremendous therapeutic appeal. The present paper reviews the pathophysiology of muscle and fat wasting in HF and discusses potential treatments, including exercise training, appetite stimulants, essential amino acids, growth hormone, testosterone, electrical muscle stimulation, ghrelin and its analogues, ghrelin receptor agonists and myostatin antibodies.
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37
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Kob R, Fellner C, Bertsch T, Wittmann A, Mishura D, Sieber CC, Fischer BE, Stroszczynski C, Bollheimer CL. Gender-specific differences in the development of sarcopenia in the rodent model of the ageing high-fat rat. J Cachexia Sarcopenia Muscle 2015; 6:181-91. [PMID: 26136194 PMCID: PMC4458084 DOI: 10.1002/jcsm.12019] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 02/05/2015] [Accepted: 02/23/2015] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Sarcopenia is linked to functional impairments, loss of independence, and mortality. In the past few years, obesity has been established as being a risk factor for a decline in muscle mass and function. There are several molecular pathological mechanisms, which have been under discussion that might explain this relationship. However, most studies were conducted using male animals and for a short period of time. METHODS In this study, the gender-specific effect of long-term, high-fat content feeding in Sprague-Dawley rats was examined. Development of the quadriceps muscle of the animals was monitored in vivo using magnetic resonance. The results of these measurements and of the biochemical analysis of the aged muscle were compared. RESULTS Surprisingly, only male but not female rats showed a decline in muscle cross-sectional area at 16 months of age as a result of a chronic oversupply of dietary fats. This loss of muscle mass could not be explained by either de-regulation of the anabolic Akt pathway or by up-regulation of the main ubiquitin ligases of muscle, MAFbx and MuRF-1. However, fusion of satellite cells to myotubes was induced by the high-fat diet in male rats, possibly as a result of an increased need for compensatory regeneration processes. Caspase-3-dependent apoptosis induction, irrespective of diet, seems to be the major determinant of muscle decline during ageing in male but not female rats. CONCLUSION Taken together, activation of the apoptosis-inducing Caspase-3 seems to be the most important trigger for the age-related muscle loss. Male rats were more prone to the decline of muscle during ageing than female animals, which was further enforced by a long-term, high fat diet.
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Affiliation(s)
- Robert Kob
- Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nuremberg, Germany
| | - Claudia Fellner
- Institute of Radiology, University Hospital Regensburg, Regensburg, Germany
| | - Thomas Bertsch
- Institute of Clinical Chemistry, Laboratory Medicine and Transfusion Medicine, Paracelsus Medical University, Nuremberg, Germany
| | - Astrid Wittmann
- Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nuremberg, Germany
| | - Daria Mishura
- Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nuremberg, Germany
| | - Cornel C Sieber
- Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nuremberg, Germany.,Department of General Internal Medicine and Geriatrics, Hospital of the Order of St. John of God, Regensburg, Germany
| | - Barbara E Fischer
- Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nuremberg, Germany
| | | | - Cornelius L Bollheimer
- Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nuremberg, Germany.,Department of General Internal Medicine and Geriatrics, Hospital of the Order of St. John of God, Regensburg, Germany
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Rice KM, Manne NDPK, Gadde MK, Paturi S, Arvapalli R, Blough E. Differential regulation of apoptosis in slow and fast twitch muscles of aged female F344BN rats. AGE (DORDRECHT, NETHERLANDS) 2015; 37:30. [PMID: 25813803 PMCID: PMC4375133 DOI: 10.1007/s11357-015-9767-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 03/09/2015] [Indexed: 05/13/2023]
Abstract
Age-related muscle atrophy is characterized by decreases in muscle mass and is thought be mediated, at least in part, by increases in myocyte apoptosis. Recent data has demonstrated that the degree of muscle loss with aging may differ between males and females while other work has suggested that apoptosis as indicated by DNA fragmentation may be regulated differently in fast- and slow-twitch muscles. Herein, we investigate how aging affects the regulation of muscle apoptosis in the fast-twitch extensor digitorum longus (EDL) and slow-twitch soleus muscles of young (6-month), aged (26-month), and very aged (30-month) female Fischer 344/NNiaHSD × Brown Norway/BiNia (F344BN) rats. Tissue sections were stained with hydroethidium for ROS and protein extract was subjected to immunoblotting for assessing apoptotic markers. Our data suggest that decreases in muscle mass were associated with increased DNA fragmentation (TUNEL positive) and increases in reactive oxygen species (ROS) as determined by hydroethidium staining in both the EDL and soleus. Similar to our previous work using aged male animals, we observed that the time course and magnitude of changes in Bax, Bcl-2, caspase-3, caspase-9, and cleavage of α-fodrin protein were regulated differently between muscles. These data suggest that aging in the female F344BN rat is associated with decreases in muscle mass, elevations in ROS level, increased muscle cell DNA fragmentation, and alterations in cell membrane integrity and that apoptotic mechanisms may differ between fiber types.
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Affiliation(s)
- Kevin M Rice
- Center for Diagnostic Nanosystems, Marshall University, Room 241D, Robert C. Byrd Biotechnology Science Center Building, 1700 3rd Ave., Huntington, WV, 25755-1090, USA,
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Meneses C, Morales MG, Abrigo J, Simon F, Brandan E, Cabello-Verrugio C. The angiotensin-(1-7)/Mas axis reduces myonuclear apoptosis during recovery from angiotensin II-induced skeletal muscle atrophy in mice. Pflugers Arch 2014; 467:1975-84. [PMID: 25292283 DOI: 10.1007/s00424-014-1617-9] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 09/02/2014] [Accepted: 09/17/2014] [Indexed: 12/27/2022]
Abstract
Angiotensin-(1-7) [Ang (1-7)] is a peptide belonging to the non-classical renin-angiotensin system (RAS). Ang (1-7), through its receptor Mas, has an opposite action to angiotensin II (Ang II), the typical peptide of the classical RAS axis. Ang II produces skeletal muscle atrophy, a pathological condition characterised by the loss of strength and muscle mass. A feature of muscle atrophy is the decrease of the myofibrillar proteins produced by the activation of the ubiquitin-proteasome pathway (UPP), evidenced by the increase in the expression of two muscle-specific ubiquitin ligases: atrogin-1 and MuRF-1. In addition, it has been described that Ang II also induces myonuclear apoptosis during muscle atrophy. We assessed the effects of Ang (1-7) and Mas participation on myonuclear apoptosis during skeletal muscle atrophy induced by Ang II. Our results show that Ang (1-7), through Mas, prevents the effects induced by Ang II in the diaphragm muscles and decreases several events associated with apoptosis in the diaphragm (increased apoptotic nuclei, increased expression of caspase-8 and caspase-9, increased caspase-3 activity and increased Bax/Bcl-2 ratio). Concomitantly, Ang (1-7) also attenuates the decrease in fibre diameter and muscle strength, and prevents the increase in atrogin-1 and MuRF-1 during the muscle wasting induced by Ang II. Interestingly, these effects of Ang (1-7) are dependent on the Mas receptor. Thus, we demonstrated for the first time that Ang (1-7) prevents myonuclear apoptosis during the recovery of skeletal muscle atrophy induced by Ang II.
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Affiliation(s)
- Carla Meneses
- Laboratorio de Biología y Fisiopatología Molecular, Departamento de Ciencias Biológicas, Facultad de Ciencias Biológicas y Facultad de Medicina, Universidad Andres Bello, Santiago, Chile
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Schöneich C, Dremina E, Galeva N, Sharov V. Apoptosis in differentiating C2C12 muscle cells selectively targets Bcl-2-deficient myotubes. Apoptosis 2014; 19:42-57. [PMID: 24129924 DOI: 10.1007/s10495-013-0922-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Muscle cell apoptosis accompanies normal muscle development and regeneration, as well as degenerative diseases and aging. C2C12 murine myoblast cells represent a common model to study muscle differentiation. Though it was already shown that myogenic differentiation of C2C12 cells is accompanied by enhanced apoptosis in a fraction of cells, either the cell population sensitive to apoptosis or regulatory mechanisms for the apoptotic response are unclear so far. In the current study we characterize apoptotic phenotypes of different types of C2C12 cells at all stages of differentiation, and report here that myotubes of differentiated C2C12 cells with low levels of anti-apoptotic Bcl-2 expression are particularly vulnerable to apoptosis even though they are displaying low levels of pro-apoptotic proteins Bax, Bak and Bad. In contrast, reserve cells exhibit higher levels of Bcl-2 and high resistance to apoptosis. The transfection of proliferating myoblasts with Bcl-2 prior to differentiation did not protect against spontaneous apoptosis accompanying differentiation of C2C12 cells but led to Bcl-2 overexpression in myotubes and to significant protection from apoptotic cell loss caused by exposure to hydrogen peroxide. Overall, our data advocate for a Bcl-2-dependent mechanism of apoptosis in differentiated muscle cells. However, downstream processes for spontaneous and hydrogen peroxide induced apoptosis are not completely similar. Apoptosis in differentiating myoblasts and myotubes is regulated not through interaction of Bcl-2 with pro-apoptotic Bcl-2 family proteins such as Bax, Bak, and Bad.
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Emerson NS, Fukuda DH, Stout JR, Robinson EH, McCormack WP, Scanlon TC, Warren AM, Wells AJ, Gonzalez AM, Mangine GT, Fragala MS, Hoffman JR. Physical working capacity at fatigue threshold (PWCFT) is associated with sarcopenia-related body composition and measures of functionality in older adults. Arch Gerontol Geriatr 2014; 59:300-4. [PMID: 24856645 DOI: 10.1016/j.archger.2014.04.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 04/11/2014] [Accepted: 04/24/2014] [Indexed: 11/27/2022]
Abstract
The relationship between PWCFT and common measures used to assess sarcopenia in older adults were examined. Fifty-eight older adults [age: 71.1 ± 6.2 years; body mass index (BMI): 28.0 ± 5.4 kg/m(2)] completed the testing procedures. Sarcopenia-related body composition was measured by dual-energy X-ray absorptiometry and participants performed a discontinuous cycle ergometry test to determine PWCFT. Functionality assessments included maximal isometric grip strength (GRIP) and sit-to-stand (STS) repetitions in 30s. Muscle quality (MQ) was defined as GRIP relative to appendicular lean soft tissue (ALM), while skeletal muscle index (SMI) was defined as ALM/height(2). Pearson correlations were used to examine the relationships among dependent variables. PWCFT showed significant relationships with ALM (r=0.57), SMI (r=0.47), body fat percentage (BF%) (r=-0.50), GRIP (r=0.49), and STS (r=0.44). For follow-up analyses, study participants were categorized into low sarcopenia risk (n=31) or high sarcopenia risk (n=27) groups by SMI. Sarcopenia risk was associated with PWCFT [odds ratio (OR): 1.051, 95% confidence interval (CI): 1.016-1.087] and STS (OR: 1.305, CI: 1.060-1.607), but not GRIP (OR: 1.098, CI: 0.989-1.218). Using receiver-operator characteristic curve analysis, both PWCFT [area under the curve (AUC): 0.737, CI: 0.608-0.866, optimal cutoff: 37.5 W] and STS (AUC: 0.749, CI: 0.623-0.874, optimal cutoff: 12.5 repetitions) showed discriminative ability with regard to sarcopenia risk. The current data suggest that the neuromuscular fatigue threshold, as measured by PWCFT, is related to measures of body composition and function in older adults.
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Affiliation(s)
- Nadia S Emerson
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
| | - David H Fukuda
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States.
| | - Jeffrey R Stout
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
| | - Edward H Robinson
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
| | - William P McCormack
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
| | - Tyler C Scanlon
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
| | - Ashlee M Warren
- University of Central Florida Health Center, P.O. Box 163333, University of Central Florida, Orlando, FL 32816, United States
| | - Adam J Wells
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
| | - Adam M Gonzalez
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
| | - Gerald T Mangine
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
| | - Maren S Fragala
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
| | - Jay R Hoffman
- Institute of Exercise Physiology and Wellness, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, United States
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Supplementation of ketoacids contributes to the up-regulation of the Wnt7a/Akt/p70S6K pathway and the down-regulation of apoptotic and ubiquitin–proteasome systems in the muscle of 5/6 nephrectomised rats. Br J Nutr 2014; 111:1536-48. [DOI: 10.1017/s0007114513004091] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Ketoacids (KA) are known to improve muscle mass among patients with chronic kidney disease (CKD) on a low-protein diet (CKD-LPD), but the mechanism of its preventive effects on muscle atrophy still remains unclear. Since muscle atrophy in CKD may be attributable to the down-regulation of the Wnt7a/Akt/p70S6K pathway and the activation of the ubiquitin–proteasome system (UPS) and the apoptotic signalling pathway, a hypothesis can readily be drawn that KA supplementation improves muscle mass by up-regulating the Wnt7a/Akt/p70S6K pathway and counteracting the activation of the UPS and caspase-3-dependent apoptosis in the muscle of CKD-LPD rats. Rats with 5/6 nephrectomy were randomly divided into three groups, and fed with either 22 % protein (normal-protein diet; NPD), 6 % protein (LPD) or 5 % protein plus 1 % KA for 24 weeks. Sham-operated rats with NPD intake were used as the control. The results demonstrated that KA supplementation improved protein synthesis and increased related mediators such as Wnt7a, phosphorylated Akt and p70S6K in the muscle of CKD-LPD rats. It also inhibited protein degradation, withheld the increase in ubiquitin and its ligases MAFbx (muscle atrophy F-box) and MuRF1 (muscle ring finger-1) as well as attenuated proteasome activity in the muscle of CKD-LPD rats. Moreover, KA supplementation gave rise to a reduction in DNA fragment, cleaved caspase-3 and 14 kDa actin fragment via the down-regulation of the Bax:Bcl-2 ratio in the muscle of CKD-LPD rats. The beneficial effects unveiled herein further consolidate that KA may be a better therapeutic strategy for muscle atrophy in CKD-LPD.
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Chang L, Liu X, Liu J, Li H, Yang Y, Liu J, Guo Z, Xiao K, Zhang C, Liu J, Zhao-Wilson X, Long J. D-galactose induces a mitochondrial complex I deficiency in mouse skeletal muscle: potential benefits of nutrient combination in ameliorating muscle impairment. J Med Food 2014; 17:357-64. [PMID: 24476218 DOI: 10.1089/jmf.2013.2830] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Accumulating research has shown that chronic D-galactose (D-gal) exposure induces symptoms similar to natural aging in animals. Therefore, rodents chronically exposed to D-gal are increasingly used as a model for aging and delay-of-aging pharmacological research. Mitochondrial dysfunction is thought to play a vital role in aging and age-related diseases; however, whether mitochondrial dysfunction plays a significant role in mice exposed to D-gal remains unknown. In the present study, we investigated cognitive dysfunction, locomotor activity, and mitochondrial dysfunction involved in D-gal exposure in mice. We found that D-gal exposure (125 mg/kg/day, 8 weeks) resulted in a serious impairment in grip strength in mice, whereas spatial memory and locomotor coordination remained intact. Interestingly, muscular mitochondrial complex I deficiency occurred in the skeletal muscle of mice exposed to D-gal. Mitochondrial ultrastructure abnormality was implicated as a contributing factor in D-gal-induced muscular impairment. Moreover, three combinations (A, B, and C) of nutrients applied in this study effectively reversed D-gal-induced muscular impairment. Nutrient formulas B and C were especially effective in reversing complex I dysfunction in both skeletal muscle and heart muscle. These findings suggest the following: (1) chronic exposure to D-gal first results in specific muscular impairment in mice, rather than causing general, premature aging; (2) poor skeletal muscle strength induced by D-gal might be due to the mitochondrial dysfunction caused by complex I deficiency; and (3) the nutrient complexes applied in the study attenuated the skeletal muscle impairment, most likely by improving mitochondrial function.
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Affiliation(s)
- Liao Chang
- 1 The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Center for Mitochondrial Biology and Medicine, School of Life Science and Technology and Frontier Institute of Life Science, FIST, Xi'an Jiaotong University , Xi'an, China
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ul Haque A, Chatni MR, Li G, Porterfield DM. Biochips and other microtechnologies for physiomics. Expert Rev Proteomics 2014; 4:553-63. [PMID: 17705712 DOI: 10.1586/14789450.4.4.553] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This paper presents a review of microtechnologies relevant to applications in cellular physiology, including biochips, electrochemical sensors and optrodic sensing techniques. Microelectrodes have been the main tools for measuring cellular electrophysiology, oxygen, nitric oxide, neurotransmitters, pH and various ions. Optical fiber sensing methods, such as indicator-based optrodes, with fluorescence lifetime measurement, are now emerging as viable alternatives to electroanalytical chemistry. These new optrode techniques are possible because of recent advances in the optoelectronics industry and are comparably easier to miniaturize, have faster response times, do not consume the analyte and have lower operational costs. This review serves as a summary and predicts future trends for both electrochemical and optical luminescence lifetime sensing as components in lab-on-a-chip devices for physiological sensing.
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Affiliation(s)
- Aeraj ul Haque
- Purdue University, Department of Agricultural & Biological Engineering, Physiological Sensing Facility, Bindley Bioscience Research Center, West Lafayette, IN 47907, USA.
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Imbrogno S, Garofalo F, Amelio D, Capria C, Cerra MC. Humoral control of cardiac remodeling in fish: role of Angiotensin II. Gen Comp Endocrinol 2013; 194:189-97. [PMID: 24080085 DOI: 10.1016/j.ygcen.2013.09.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 09/16/2013] [Accepted: 09/18/2013] [Indexed: 10/26/2022]
Abstract
Angiotensin II (AngII), the principal effector of the Renin-Angiotensin-System (RAS), is a multipotent hormone whose biological actions include short-term modulation as well as long-term adjustments. In the eel heart, AngII elicits short-term inotropic and chronotropic effects. However, information regarding the influence of AngII on cardiac remodeling, expressed as morphological and hemodynamic changes, is lacking. To clarify the putative actions of AngII on eel cardiac remodeling, we used freshwater eels (Anguilla anguilla) intraperitoneally injected for 4 weeks with saline or AngII (0.4 or 1.2 nmol g BW(-1)) or AngII (1.2 nmol g BW(-1)) plus the AT₂ receptor antagonist CGP42112. Using an in vitro working heart preparation, the cardiac response (stroke volume changes) to preload and afterload increases has been evaluated. Hearts of all groups showed similar Frank-Starling responses. However, in response to afterload increases, stroke volume rapidly decreased in control hearts, while it was better maintained in AngII-treated counterparts. These effects were abolished by an antagonist of the AT₂ receptor, whose cardiac expression was revealed by western blotting analysis. We also found by immunolocalization and immunoblotting that AngII influences both expression and localization of molecules which regulate cell growth [such as c-kit, heat shock protein 90 (Hsp-90), endothelial Nitric Oxide Synthase "(eNOS)-like" isoform] and apoptosis [i.e. apoptosis repressor with CARD domain (ARC)], thus playing a role in cardiac long-term adjustments. These results point to a role of AngII in eel heart remodeling, providing new insights regarding the modulation of cardiac plasticity in fish.
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Affiliation(s)
- Sandra Imbrogno
- Dept. of Biology, Ecology and Earth Sciences (B.E.ST), University of Calabria, Italy.
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Kwan P. Sarcopenia: the gliogenic perspective. Mech Ageing Dev 2013; 134:349-55. [PMID: 23831860 DOI: 10.1016/j.mad.2013.06.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Revised: 06/20/2013] [Accepted: 06/22/2013] [Indexed: 12/15/2022]
Abstract
It has been approximately 25 years since Dr. Rosenberg first brought attention to sarcopenia. To date, this aging-associated condition is recognized as a chronic loss of muscle mass and is usually accompanied by dynapenia. Despite its poly-etiological factors, sarcopenia has a strong neurogenic component underlying this chrono-degeneration of muscle mass, as shown in recent studies. As it seems plausible to explain the origin of sarcopenia through a motor neuron degeneration model, the focus of sarcopenia research should combine neuroscience with the study of the original myocyte and satellite cells. Although a complete mechanism underlying the development of sarcopenia has yet to be elucidated, we propose that the primary trigger of sarcopenia could be gliogenic in origin based on the close relationship between the glia, neurons and non-neural cells, for example, the motor unit and its associated glia in both the central nervous system (CNS) and the peripheral nervous system (PNS). In addition to muscle cells, both of the neural cells are affected by aging.
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Affiliation(s)
- Ping Kwan
- ST013a, Department of Rehabilitation Sciences, Hong Kong Polytechnic University, Hong Kong.
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Short-term caloric restriction, resveratrol, or combined treatment regimens initiated in late-life alter mitochondrial protein expression profiles in a fiber-type specific manner in aged animals. Exp Gerontol 2013; 48:858-68. [PMID: 23747682 DOI: 10.1016/j.exger.2013.05.061] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 04/26/2013] [Accepted: 05/29/2013] [Indexed: 01/08/2023]
Abstract
Aging is associated with a loss in muscle known as sarcopenia that is partially attributed to apoptosis. In aging rodents, caloric restriction (CR) increases health and longevity by improving mitochondrial function and the polyphenol resveratrol (RSV) has been reported to have similar benefits. In the present study, we investigated the potential efficacy of using short-term (6 weeks) CR (20%), RSV (50 mg/kg/day), or combined CR+ RSV (20% CR and 50 mg/kg/day RSV), initiated at late-life (27 months) to protect muscle against sarcopenia by altering mitochondrial function, biogenesis, content, and apoptotic signaling in both glycolytic white and oxidative red gastrocnemius muscle (WG and RG, respectively) of male Fischer 344 × Brown Norway rats. CR but not RSV attenuated the age-associated loss of muscle mass in both mixed gastrocnemius and soleus muscle, while combined treatment (CR + RSV) paradigms showed a protective effect in the soleus and plantaris muscle (P < 0.05). Sirt1 protein content was increased by 2.6-fold (P < 0.05) in WG but not RG muscle with RSV treatment, while CR or CR + RSV had no effect. PGC-1α levels were higher (2-fold) in the WG from CR-treated animals (P < 0.05) when compared to ad-libitum (AL) animals but no differences were observed in the RG with any treatment. Levels of the anti-apoptotic protein Bcl-2 were significantly higher (1.6-fold) in the WG muscle of RSV and CR + RSV groups compared to AL (P < 0.05) but tended to occur coincident with elevations in the pro-apoptotic protein Bax so that the apoptotic susceptibility as indicated by the Bax to Bcl-2 ratio was unchanged. There were no alterations in DNA fragmentation with any treatment in muscle from older animals. Additionally, mitochondrial respiration measured in permeabilized muscle fibers was unchanged in any treatment group and this paralleled the lack of change in cytochrome c oxidase (COX) activity. These data suggest that short-term moderate CR, RSV, or CR + RSV tended to modestly alter key mitochondrial regulatory and apoptotic signaling pathways in glycolytic muscle and this might contribute to the moderate protective effects against aging-induced muscle loss observed in this study.
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Nilwik R, Snijders T, Leenders M, Groen BB, van Kranenburg J, Verdijk LB, van Loon LJ. The decline in skeletal muscle mass with aging is mainly attributed to a reduction in type II muscle fiber size. Exp Gerontol 2013; 48:492-8. [DOI: 10.1016/j.exger.2013.02.012] [Citation(s) in RCA: 391] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 02/07/2013] [Accepted: 02/11/2013] [Indexed: 12/25/2022]
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Kwak HB. Effects of aging and exercise training on apoptosis in the heart. J Exerc Rehabil 2013; 9:212-9. [PMID: 24278863 PMCID: PMC3836520 DOI: 10.12965/jer.130002] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2013] [Revised: 03/04/2013] [Accepted: 04/02/2013] [Indexed: 12/30/2022] Open
Abstract
Aging is characterized by a progressive decline in cardiac function. A critical contributor to the age-related impairment in cardiac function is the loss of cardiac myocytes through “apoptosis”, or programmed cell death. Structural remodeling in the heart with advancing age includes (a) loss of cardiomyocytes, (b) reactive hypertrophy of the remaining cardiomyocytes, and (c) increased connective tissue and altered geometry. The loss of cardiomyocytes with aging occurs through apoptosis. Particularly, mitochondrial-mediated apoptotic pathway is the best characterized and believed critical in regulating apoptosis with aging, suggesting that mitochondria are very important sites of programmed cell death. It has been also reported that mitochondrial dysfunction, oxidative stress, and impaired stress response contribute to age-induced mechanical remodeling as well as apoptosis. In contrast, exercise training not only improves cardiac function, but also reduces the risk of heart disease. We recently found that aging increased mitochondrial-mediated apoptotic signaling and apoptosis in the left ventricle, while chronic exercise training was effective in diminishing mitochondrial-mediated apoptotic signaling pathways in the aging heart, as indicated by lower DNA fragmentation, terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL)-positive staining, and caspase-3 cleavage, when compared with left ventricles from the age-matched sedentary group. In this review, we will provide a comprehensive update regarding the effects of aging and exercise training on apoptosis in the heart.
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Affiliation(s)
- Hyo-Bum Kwak
- Department of Kinesiology, Inha University, Incheon, Korea
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Abstract
Sarcopenia is an aging-associated condition, which is currently characterized by the loss of muscle mass and muscle strength. However, there is no consensus regarding its characterization hitherto. As the world older adult population is on the rise, the impact of sarcopenia becomes greater. Due to the lack of effective treatments, sarcopenia is still a persisting problem among the global older adults and should not be overlooked. As a result, it is vital to investigate deeper into the mechanism underlying the pathogenesis of sarcopenia in order to develop more effective therapeutic interventions and to inscribe a more uniform characterization. The etiology of sarcopenia is currently found to be multifactorial, and most of the pharmacological researches are focused on the muscular factors in aging. Although the complete mechanism underlying the development of sarcopenia is still waiting to be elucidated, we propose in this article that the primary trigger of sarcopenia may be neurogenic in origin based on the intimate relationship between the nervous and muscular system, namely, the motor neuron and its underlying muscle fibers. Both of them are affected by the cellular environment and their physiological activity.
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