301
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Brown JL, Rosa‐Caldwell ME, Lee DE, Blackwell TA, Brown LA, Perry RA, Haynie WS, Hardee JP, Carson JA, Wiggs MP, Washington TA, Greene NP. Mitochondrial degeneration precedes the development of muscle atrophy in progression of cancer cachexia in tumour-bearing mice. J Cachexia Sarcopenia Muscle 2017; 8:926-938. [PMID: 28845591 PMCID: PMC5700433 DOI: 10.1002/jcsm.12232] [Citation(s) in RCA: 178] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 06/16/2017] [Accepted: 07/14/2017] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Cancer cachexia is largely irreversible, at least via nutritional means, and responsible for 20-40% of cancer-related deaths. Therefore, preventive measures are of primary importance; however, little is known about muscle perturbations prior to onset of cachexia. Cancer cachexia is associated with mitochondrial degeneration; yet, it remains to be determined if mitochondrial degeneration precedes muscle wasting in cancer cachexia. Therefore, our purpose was to determine if mitochondrial degeneration precedes cancer-induced muscle wasting in tumour-bearing mice. METHODS First, weight-stable (MinStable) and cachectic (MinCC) ApcMin/+ mice were compared with C57Bl6/J controls for mRNA contents of mitochondrial quality regulators in quadriceps muscle. Next, Lewis lung carcinoma (LLC) cells or PBS (control) were injected into the hind flank of C57Bl6/J mice at 8 week age, and tumour allowed to develop for 1, 2, 3, or 4 weeks to examine time course of cachectic development. Succinate dehydrogenase stain was used to measure oxidative phenotype in tibialis anterior muscle. Mitochondrial quality and function were assessed using the reporter MitoTimer by transfection to flexor digitorum brevis and mitochondrial function/ROS emission in permeabilized adult myofibres from plantaris. RT-qPCR and immunoblot measured the expression of mitochondrial quality control and antioxidant proteins. Data were analysed by one-way ANOVA with Student-Newman-Kuels post hoc test. RESULTS MinStable mice displayed ~50% lower Pgc-1α, Pparα, and Mfn2 compared with C57Bl6/J controls, whereas MinCC exhibited 10-fold greater Bnip3 content compared with C57Bl6/J controls. In LLC, cachectic muscle loss was evident only at 4 weeks post-tumour implantation. Oxidative capacity and mitochondrial content decreased by ~40% 4 weeks post-tumour implantation. Mitochondrial function decreased by ~25% by 3 weeks after tumour implantation. Mitochondrial degeneration was evident by 2 week LLC compared with PBS control, indicated by MitoTimer red/green ratio and number of pure red puncta. Mitochondrial ROS production was elevated by ~50 to ~100% when compared with PBS at 1-3 weeks post-tumour implantation. Mitochondrial quality control was dysregulated throughout the progression of cancer cachexia in tumour-bearing mice. In contrast, antioxidant proteins were not altered in cachectic muscle wasting. CONCLUSIONS Functional mitochondrial degeneration is evident in LLC tumour-bearing mice prior to muscle atrophy. Contents of mitochondrial quality regulators across ApcMin/+ and LLC mice suggest impaired mitochondrial quality control as a commonality among pre-clinical models of cancer cachexia. Our data provide novel evidence for impaired mitochondrial health prior to cachectic muscle loss and provide a potential therapeutic target to prevent cancer cachexia.
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Affiliation(s)
- Jacob L. Brown
- Integrative Muscle Metabolism Laboratory, Exercise Science Research Center, Department of Health, Human Performance and RecreationUniversity of ArkansasFayettevilleAR72701USA
| | - Megan E. Rosa‐Caldwell
- Integrative Muscle Metabolism Laboratory, Exercise Science Research Center, Department of Health, Human Performance and RecreationUniversity of ArkansasFayettevilleAR72701USA
| | - David E. Lee
- Integrative Muscle Metabolism Laboratory, Exercise Science Research Center, Department of Health, Human Performance and RecreationUniversity of ArkansasFayettevilleAR72701USA
| | - Thomas A. Blackwell
- Integrative Muscle Metabolism Laboratory, Exercise Science Research Center, Department of Health, Human Performance and RecreationUniversity of ArkansasFayettevilleAR72701USA
| | - Lemuel A. Brown
- Exercise Muscle Biology Laboratory, Exercise Science Research Center, Department of Health, Human Performance and RecreationUniversity of ArkansasFayettevilleAR72701USA
| | - Richard A. Perry
- Exercise Muscle Biology Laboratory, Exercise Science Research Center, Department of Health, Human Performance and RecreationUniversity of ArkansasFayettevilleAR72701USA
| | - Wesley S. Haynie
- Exercise Muscle Biology Laboratory, Exercise Science Research Center, Department of Health, Human Performance and RecreationUniversity of ArkansasFayettevilleAR72701USA
| | - Justin P. Hardee
- Integrative Muscle Biology Laboratory, Department of Exercise ScienceUniversity of South CarolinaColumbiaSC29208USA
| | - James A. Carson
- Integrative Muscle Biology Laboratory, Department of Exercise ScienceUniversity of South CarolinaColumbiaSC29208USA
| | - Michael P. Wiggs
- Integrated Physiology and Nutrition Laboratory, Department of Health and KinesiologyUniversity of Texas at TylerTylerTX75799USA
| | - Tyrone A. Washington
- Exercise Muscle Biology Laboratory, Exercise Science Research Center, Department of Health, Human Performance and RecreationUniversity of ArkansasFayettevilleAR72701USA
| | - Nicholas P. Greene
- Integrative Muscle Metabolism Laboratory, Exercise Science Research Center, Department of Health, Human Performance and RecreationUniversity of ArkansasFayettevilleAR72701USA
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302
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The histone code reader Spin1 controls skeletal muscle development. Cell Death Dis 2017; 8:e3173. [PMID: 29168801 PMCID: PMC5775400 DOI: 10.1038/cddis.2017.468] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 07/12/2017] [Accepted: 07/28/2017] [Indexed: 01/06/2023]
Abstract
While several studies correlated increased expression of the histone code reader Spin1 with tumor formation or growth, little is known about physiological functions of the protein. We generated Spin1M5 mice with ablation of Spin1 in myoblast precursors using the Myf5-Cre deleter strain. Most Spin1M5 mice die shortly after birth displaying severe sarcomere disorganization and necrosis. Surviving Spin1M5 mice are growth-retarded and exhibit the most prominent defects in soleus, tibialis anterior, and diaphragm muscle. Transcriptome analyses of limb muscle at embryonic day (E) 15.5, E16.5, and at three weeks of age provided evidence for aberrant fetal myogenesis and identified deregulated skeletal muscle (SkM) functional networks. Determination of genome-wide chromatin occupancy in primary myoblast revealed direct Spin1 target genes and suggested that deregulated basic helix-loop-helix transcription factor networks account for developmental defects in Spin1M5 fetuses. Furthermore, correlating histological and transcriptome analyses, we show that aberrant expression of titin-associated proteins, abnormal glycogen metabolism, and neuromuscular junction defects contribute to SkM pathology in Spin1M5 mice. Together, we describe the first example of a histone code reader controlling SkM development in mice, which hints at Spin1 as a potential player in human SkM disease.
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303
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Gaffney CJ, Fomina E, Babich D, Kitov V, Uskov K, Green DA. The effect of long-term confinement and the efficacy of exercise countermeasures on muscle strength during a simulated mission to Mars: data from the Mars500 study. SPORTS MEDICINE-OPEN 2017; 3:40. [PMID: 29134470 PMCID: PMC5684057 DOI: 10.1186/s40798-017-0107-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 10/30/2017] [Indexed: 12/15/2022]
Abstract
Background Isolation and long duration spaceflight are associated with musculoskeletal deconditioning. Mars500 was a unique, high-fidelity analogue of the psychological challenges of a 520-day manned mission to Mars. We aimed to explore the effect of musculoskeletal deconditioning on three outcome measures: (1) if lower limb muscle strength was reduced during the 520-day isolation; (2) if type I or II muscle fibres were differentially affected; and (3) whether any 70-day exercise interventions prevented any isolation-induced loss of strength. Methods Six healthy male subjects (mean ± SEM) (34 ± 3 years; 1.76 ± 0.02 metres; 83.7 ± 4.8 kg) provided written, informed consent to participate. The subjects’ maximal voluntary contraction (MVC) was assessed isometrically in the calf (predominantly type I fibres), and maximal voluntary isokinetic force (MVIF) was assessed in the quadriceps/hamstrings (predominantly type II fibres) at 0.2 and 0.4 ms−1 using the Multifunctional Dynamometer for Space (MDS) at 35-day intervals throughout Mars500. Exercise interventions were completed 3–7 days/week throughout the 520-day isolation in a counterbalanced design excluding 142–177 days (rest period) and 251–284 days (simulated Mars landing). Exercise interventions included motorized treadmill running, non-motorized treadmill running, cycle ergometry, elastomer-based resistance exercise, whole-body vibration (WBV), and resistance exercise using MDS. Results Calf MVC did not reduce across the 520-day isolation and MDS increased strength by 18% compared to before that of 70-day exercise intervention. In contrast, there was a significant bilateral loss of MVIF across the 520 days at both 0.2 ms−1 (R2 = 0.53; P = 0.001) and 0.4 ms−1 (0.4 ms−1; R2 = 0.42; P = 0.007). WBV (+ 3.7 and 8.8%) and MDS (+ 4.9 and 5.2%) afforded the best protection against isolation-induced loss of MVIF, although MDS was the only intervention to prevent bilateral loss of calf MVC and leg MVIF at 0.2 and 0.4 ms−1. Conclusions Mars500 induced significant loss of quadriceps/hamstrings MVIF but not calf MVC. Collectively, these data suggest that muscles with predominantly type I fibres were affected less by isolation compared to type II dominant muscles. MDS and WBV afforded the best protection against isolation-induced loss of strength and thus may have virtue in exploration class missions. Electronic supplementary material The online version of this article (10.1186/s40798-017-0107-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Christopher J Gaffney
- Institute of Biomedical Problems (IBMP), Moscow, Russia. .,Centre of Human & Aerospace Physiological Sciences (CHAPS), King's College London, Faculty of Life Sciences & Medicine, Guy's Campus, London, SE1 1UL, UK.
| | - Elena Fomina
- Institute of Biomedical Problems (IBMP), Moscow, Russia
| | - Dennis Babich
- Institute of Biomedical Problems (IBMP), Moscow, Russia
| | | | | | - David A Green
- Centre of Human & Aerospace Physiological Sciences (CHAPS), King's College London, Faculty of Life Sciences & Medicine, Guy's Campus, London, SE1 1UL, UK.,KBRwyle, European Astronaut Centre, Linder Höhe, D-51147, Cologne, Germany
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304
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Pingel J, Nielsen MS, Lauridsen T, Rix K, Bech M, Alkjaer T, Andersen IT, Nielsen JB, Feidenhansl R. Injection of high dose botulinum-toxin A leads to impaired skeletal muscle function and damage of the fibrilar and non-fibrilar structures. Sci Rep 2017; 7:14746. [PMID: 29116170 PMCID: PMC5677119 DOI: 10.1038/s41598-017-14997-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 10/20/2017] [Indexed: 12/30/2022] Open
Abstract
Botulinum-toxin A (BoNT/A) is used for a wide range of conditions. Intramuscular administration of BoNT/A inhibits the release of acetylcholine at the neuromuscular junction from presynaptic motor neurons causing muscle-paralysis. The aim of the present study was to investigate the effect of high dose intramuscular BoNT/A injections (6 UI = 60 pg) on muscle tissue. The gait pattern of the rats was significantly affected 3 weeks after BoNT/A injection. The ankle joint rotated externally, the rats became flat footed, and the stride length decreased after BoNT/A injection. Additionally, there was clear evidence of microstructural changes on the tissue level by as evidenced by 3D imaging of the muscles by Synchrotron Radiation X-ray Tomographic Microscopy (SRXTM). Both the fibrillar and the non-fibrillar tissues were affected. The volume fraction of fibrillary tissue was reduced significantly and the non-fibrillar tissue increased. This was accompanied by a loss of the linear structure of the muscle tissue. Furthermore, gene expression analysis showed a significant upregulation of COL1A1, MMP-2, TGF-b1, IL-6, MHCIIA and MHCIIx in the BoNT/A injected leg, while MHVIIB was significantly downregulated. IN CONCLUSION The present study reveals that high dose intramuscular BoNT/A injections cause microstructural damage of the muscle tissue, which contributes to impaired gait.
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Affiliation(s)
- Jessica Pingel
- Center for Neuroscience, University of Copenhagen, Copenhagen, Denmark.
| | | | | | - Kristian Rix
- Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
| | - Martin Bech
- Medical Radiation Physics, Clinical Sciences, Lund University, Lund, Sweden
| | - Tine Alkjaer
- Center for Neuroscience, University of Copenhagen, Copenhagen, Denmark
| | - Ida Torp Andersen
- Center for Neuroscience, University of Copenhagen, Copenhagen, Denmark
| | - Jens Bo Nielsen
- Center for Neuroscience, University of Copenhagen, Copenhagen, Denmark
| | - R Feidenhansl
- Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
- European XFEL, Hamburg, Germany
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305
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Vorobej K, Mitchell AS, Smith IC, Donath S, Russell Tupling A, Quadrilatero J. The effect of ARC ablation on skeletal muscle morphology, function, and apoptotic signaling during aging. Exp Gerontol 2017; 101:69-79. [PMID: 29056555 DOI: 10.1016/j.exger.2017.10.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 10/11/2017] [Accepted: 10/18/2017] [Indexed: 12/24/2022]
Abstract
Augmented apoptotic signaling can result in degradation of skeletal muscle proteins and loss of myonuclei, ultimately contributing to muscle atrophy and contractile dysfunction. Apoptosis repressor with caspase recruitment domain (ARC) is an anti-apoptotic protein highly expressed in skeletal muscle. Here we examined the role of ARC on age-related skeletal muscle apoptosis and wasting by utilizing an ARC-deficient mouse model. Aged mice displayed a number of morphological, phenotypic, and contractile alterations in both soleus and plantaris muscle with aging. Although no differences were found in proteolytic enzyme activity, ARC protein decreased while several anti-apoptotic proteins (e.g., BCL2, BCLXL, HSP70, and XIAP) and the release of mitochondrial housed protein (i.e., SMAC, AIF) increased in aged muscle. Importantly, ARC KO mice had low muscle weights and fewer fibers in soleus, with 2-year-old ARC KO mice displaying lower mitochondrial BCL2 protein along with augmented release of CYTC and SMAC in red/oxidative muscle. Overall, these results indicate that aged skeletal muscle undergoes atrophy as well as contractile and fiber type composition alterations despite an increase in anti-apoptotic protein expression. Although some mitochondrial-specific apoptotic alterations occurred in skeletal muscle due to ARC ablation over the lifespan, our data suggest that ARC may not have a large influence during skeletal muscle aging.
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Affiliation(s)
- Kira Vorobej
- Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada
| | - Andrew S Mitchell
- Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada
| | - Ian C Smith
- Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada
| | - Stefan Donath
- Max-Delbrück Center for Molecular Medicine, Berlin, Germany; Center for Stroke Research Berlin, Charite-University Medicine, Berlin, Germany; Department of Cardiology and Nephrology, HELIOS Clinics GmbH, Berlin, Germany
| | - A Russell Tupling
- Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada
| | - Joe Quadrilatero
- Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada.
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306
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Wei L, Gregorich ZR, Lin Z, Cai W, Jin Y, McKiernan SH, McIlwain S, Aiken JM, Moss RL, Diffee GM, Ge Y. Novel Sarcopenia-related Alterations in Sarcomeric Protein Post-translational Modifications (PTMs) in Skeletal Muscles Identified by Top-down Proteomics. Mol Cell Proteomics 2017; 17:134-145. [PMID: 29046390 DOI: 10.1074/mcp.ra117.000124] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 10/17/2017] [Indexed: 11/06/2022] Open
Abstract
Sarcopenia, the age-related loss of skeletal muscle mass and strength, is a significant cause of morbidity in the elderly and is a major burden on health care systems. Unfortunately, the underlying molecular mechanisms in sarcopenia remain poorly understood. Herein, we utilized top-down proteomics to elucidate sarcopenia-related changes in the fast- and slow-twitch skeletal muscles of aging rats with a focus on the sarcomeric proteome, which includes both myofilament and Z-disc proteins-the proteins that constitute the contractile apparatuses. Top-down quantitative proteomics identified significant changes in the post-translational modifications (PTMs) of critical myofilament proteins in the fast-twitch skeletal muscles of aging rats, in accordance with the vulnerability of fast-twitch muscles to sarcopenia. Surprisingly, age-related alterations in the phosphorylation of Cypher isoforms, proteins that localize to the Z-discs in striated muscles, were also noted in the fast-twitch skeletal muscle of aging rats. This represents the first report of changes in the phosphorylation of Z-disc proteins in skeletal muscle during aging. In addition, increased glutathionylation of slow skeletal troponin I, a novel modification that may help protect against oxidative damage, was observed in slow-twitch skeletal muscles. Furthermore, we have identified and characterized novel muscle type-specific proteoforms of myofilament proteins and Z-disc proteins, including a novel isoform of the Z-disc protein Enigma. The finding that the phosphorylation of Z-disc proteins is altered in response to aging in the fast-twitch skeletal muscles of aging rats opens new avenues for the investigation of the role of Z-discs in age-related muscle dysfunction.
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Affiliation(s)
- Liming Wei
- From the ‡Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705.,§Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
| | - Zachery R Gregorich
- From the ‡Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705.,¶Molecular and Cellular Pharmacology Training Program, University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705
| | - Ziqing Lin
- From the ‡Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705.,‖Human Proteomics Program,University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705
| | - Wenxuan Cai
- From the ‡Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705.,¶Molecular and Cellular Pharmacology Training Program, University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705
| | - Yutong Jin
- **Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin, 53706
| | - Susan H McKiernan
- ‡‡Department of Kinesiology, University of Wisconsin-Madison, 2000 Observatory Dr., Madison, Wisconsin, 53705
| | - Sean McIlwain
- §§Department of Biostatistics and Medical Informatics, University of Wisconsin-Madison, 600 Highland Ave., Madison, Wisconsin, 53792.,¶¶UW Carbone Cancer Center, University of Wisconsin-Madison, 600 Highland Ave., Madison, Wisconsin, 53792
| | - Judd M Aiken
- ‖‖Departments of Agriculture, Food, and Nutritional Sciences, University of Alberta-Edmonton, Edmonton, AB, Canada
| | - Richard L Moss
- From the ‡Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705.,‖Human Proteomics Program,University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705
| | - Gary M Diffee
- ‡‡Department of Kinesiology, University of Wisconsin-Madison, 2000 Observatory Dr., Madison, Wisconsin, 53705
| | - Ying Ge
- From the ‡Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705; .,¶Molecular and Cellular Pharmacology Training Program, University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705.,‖Human Proteomics Program,University of Wisconsin-Madison, 1111 Highland Ave., Madison, Wisconsin, 53705.,**Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin, 53706
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307
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Marzuca-Nassr GN, Murata GM, Martins AR, Vitzel KF, Crisma AR, Torres RP, Mancini-Filho J, Kang JX, Curi R. Balanced Diet-Fed Fat-1 Transgenic Mice Exhibit Lower Hindlimb Suspension-Induced Soleus Muscle Atrophy. Nutrients 2017; 9:nu9101100. [PMID: 28984836 PMCID: PMC5691716 DOI: 10.3390/nu9101100] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 09/16/2017] [Accepted: 09/22/2017] [Indexed: 12/17/2022] Open
Abstract
The consequences of two-week hindlimb suspension (HS) on skeletal muscle atrophy were investigated in balanced diet-fed Fat-1 transgenic and C57BL/6 wild-type mice. Body composition and gastrocnemius fatty acid composition were measured. Skeletal muscle force, cross-sectional area (CSA), and signaling pathways associated with protein synthesis (protein kinase B, Akt; ribosomal protein S6, S6, eukaryotic translation initiation factor 4E-binding protein 1, 4EBP1; glycogen synthase kinase3-beta, GSK3-beta; and extracellular-signal-regulated kinases 1/2, ERK 1/2) and protein degradation (atrophy gene-1/muscle atrophy F-box, atrogin-1/MAFbx and muscle RING finger 1, MuRF1) were evaluated in the soleus muscle. HS decreased soleus muscle wet and dry weights (by 43% and 26%, respectively), muscle isotonic and tetanic force (by 29% and 18%, respectively), CSA of the soleus muscle (by 36%), and soleus muscle fibers (by 45%). Fat-1 transgenic mice had a decrease in the ω-6/ω-3 polyunsaturated fatty acids (PUFAs) ratio as compared with C57BL/6 wild-type mice (56%, p < 0.001). Fat-1 mice had lower soleus muscle dry mass loss (by 10%) and preserved absolute isotonic force (by 17%) and CSA of the soleus muscle (by 28%) after HS as compared with C57BL/6 wild-type mice. p-GSK3B/GSK3B ratio was increased (by 70%) and MuRF-1 content decreased (by 50%) in the soleus muscle of Fat-1 mice after HS. Balanced diet-fed Fat-1 mice are able to preserve in part the soleus muscle mass, absolute isotonic force and CSA of the soleus muscle in a disuse condition.
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Affiliation(s)
- Gabriel Nasri Marzuca-Nassr
- Department of Internal Medicine, Faculty of Medicine, Universidad de La Frontera, Temuco 4780000, Chile.
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.
| | - Gilson Masahiro Murata
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.
| | - Amanda Roque Martins
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.
| | - Kaio Fernando Vitzel
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.
- School of Health Sciences, College of Health, Massey University, Auckland 0632, New Zealand.
| | - Amanda Rabello Crisma
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.
| | - Rosângela Pavan Torres
- Laboratory of Lipids, Department of Food Science and Nutrition, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil.
| | - Jorge Mancini-Filho
- Laboratory of Lipids, Department of Food Science and Nutrition, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil.
| | - Jing Xuan Kang
- Laboratory for Lipid Medicine and Technology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA.
| | - Rui Curi
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.
- Interdisciplinary Post-Graduate Program in Health Sciences, Cruzeiro do Sul University, São Paulo, Brazil.
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308
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Xu Z, Feng X, Dong J, Wang ZM, Lee J, Furdui C, Files DC, Beavers KM, Kritchevsky S, Milligan C, Jin JP, Delbono O, Zhang T. Cardiac troponin T and fast skeletal muscle denervation in ageing. J Cachexia Sarcopenia Muscle 2017; 8:808-823. [PMID: 28419739 PMCID: PMC5659053 DOI: 10.1002/jcsm.12204] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 02/13/2017] [Accepted: 03/01/2017] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Ageing skeletal muscle undergoes chronic denervation, and the neuromuscular junction (NMJ), the key structure that connects motor neuron nerves with muscle cells, shows increased defects with ageing. Previous studies in various species have shown that with ageing, type II fast-twitch skeletal muscle fibres show more atrophy and NMJ deterioration than type I slow-twitch fibres. However, how this process is regulated is largely unknown. A better understanding of the mechanisms regulating skeletal muscle fibre-type specific denervation at the NMJ could be critical to identifying novel treatments for sarcopenia. Cardiac troponin T (cTnT), the heart muscle-specific isoform of TnT, is a key component of the mechanisms of muscle contraction. It is expressed in skeletal muscle during early development, after acute sciatic nerve denervation, in various neuromuscular diseases and possibly in ageing muscle. Yet the subcellular localization and function of cTnT in skeletal muscle is largely unknown. METHODS Studies were carried out on isolated skeletal muscles from mice, vervet monkeys, and humans. Immunoblotting, immunoprecipitation, and mass spectrometry were used to analyse protein expression, real-time reverse transcription polymerase chain reaction was used to measure gene expression, immunofluorescence staining was performed for subcellular distribution assay of proteins, and electromyographic recording was used to analyse neurotransmission at the NMJ. RESULTS Levels of cTnT expression in skeletal muscle increased with ageing in mice. In addition, cTnT was highly enriched at the NMJ region-but mainly in the fast-twitch, not the slow-twitch, muscle of old mice. We further found that the protein kinase A (PKA) RIα subunit was largely removed from, while PKA RIIα and RIIβ are enriched at, the NMJ-again, preferentially in fast-twitch but not slow-twitch muscle in old mice. Knocking down cTnT in fast skeletal muscle of old mice: (i) increased PKA RIα and reduced PKA RIIα at the NMJ; (ii) decreased the levels of gene expression of muscle denervation markers; and (iii) enhanced neurotransmission efficiency at NMJ. CONCLUSIONS Cardiac troponin T at the NMJ region contributes to NMJ functional decline with ageing mainly in the fast-twitch skeletal muscle through interfering with PKA signalling. This knowledge could inform useful targets for prevention and therapy of age-related decline in muscle function.
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Affiliation(s)
- Zherong Xu
- Department of Internal Medicine, Section on Gerontology and Geriatic Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA.,Department of Geriatrics, First Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou, China
| | - Xin Feng
- Department of Otolaryngology, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Juan Dong
- Department of Internal Medicine, Section on Gerontology and Geriatic Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Zhong-Min Wang
- Department of Internal Medicine, Section on Gerontology and Geriatic Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Jingyun Lee
- Department of Internal Medicine, Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Cristina Furdui
- Department of Internal Medicine, Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Daniel Clark Files
- Internal Medicine-Pulmonary, Critical Care, Allergy and Immunology, Gerontology and Geriatric Medicine and the Critical Illness Injury and Recovery Research Center, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Kristen M Beavers
- Department of Health and Exercise Science, Wake Forest University, Winston-Salem, NC, USA
| | - Stephen Kritchevsky
- Department of Internal Medicine, Section on Gerontology and Geriatic Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA.,Sticht Center for Healthy Aging and Alzheimer's Prevention, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Carolanne Milligan
- Department of Neurobiology and Anatomy, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Jian-Ping Jin
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Osvaldo Delbono
- Department of Internal Medicine, Section on Gerontology and Geriatic Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA.,Sticht Center for Healthy Aging and Alzheimer's Prevention, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Tan Zhang
- Department of Internal Medicine, Section on Gerontology and Geriatic Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA.,Sticht Center for Healthy Aging and Alzheimer's Prevention, Wake Forest School of Medicine, Winston-Salem, NC, USA
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309
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Milad N, White Z, Tehrani AY, Sellers S, Rossi FMV, Bernatchez P. Increased plasma lipid levels exacerbate muscle pathology in the mdx mouse model of Duchenne muscular dystrophy. Skelet Muscle 2017; 7:19. [PMID: 28899419 PMCID: PMC5596936 DOI: 10.1186/s13395-017-0135-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 07/28/2017] [Indexed: 01/11/2023] Open
Abstract
Background Duchenne muscular dystrophy (DMD) is caused by loss of dystrophin expression and leads to severe ambulatory and cardiac function decline. However, the dystrophin-deficient mdx murine model of DMD only develops a very mild form of the disease. Our group and others have shown vascular abnormalities in animal models of MD, a likely consequence of the fact that blood vessels express the same dystrophin-associated glycoprotein complex (DGC) proteins as skeletal muscles. Methods To test the blood vessel contribution to muscle damage in DMD, mdx4cv mice were given elevated lipid levels via apolipoprotein E (ApoE) gene knockout combined with normal chow or lipid-rich Western diets. Ambulatory function and heart function (via echocardiogram) were assessed at 4 and 7 months of age. After sacrifice, muscle histology and aortic staining were used to assess muscle pathology and atherosclerosis development, respectively. Plasma levels of total cholesterol, high-density lipoprotein (HDL), triglycerides, and creatine kinase (CK) were also measured. Results Although there was an increase in left ventricular heart volume in mdx-ApoE mice compared to that in mdx mice, parameters of heart function were not affected. Compared with wild-type and ApoE-null, only mdx-ApoE KO mice showed significant ambulatory dysfunction. Despite no significant difference in plasma CK, histological analyses revealed that elevated plasma lipids in chow- and Western diet-fed mdx-ApoE mice was associated with severe exacerbation of muscle pathology compared to mdx mice: significant increase in myofiber damage and fibrofatty replacement in the gastrocnemius and triceps brachii muscles, more reminiscent of human DMD pathology. Finally, although both ApoE and mdx-ApoE groups displayed increased plasma lipids, mdx-ApoE exhibited atherosclerotic plaque deposition equal to or less than that of ApoE mice. Conclusions Since others have shown that lipid abnormalities correlate with DMD severity, our data suggest that plasma lipids could be primary contributors to human DMD severity and that the notoriously mild phenotype of mdx mice might be attributable in part to their endogenously low plasma lipid profiles. Hence, DMD patients may benefit from lipid-lowering and vascular-targeted therapies. Electronic supplementary material The online version of this article (10.1186/s13395-017-0135-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Nadia Milad
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada.,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada
| | - Zoe White
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada.,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada
| | - Arash Y Tehrani
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada.,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada
| | - Stephanie Sellers
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada.,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada
| | - Fabio M V Rossi
- Department of Medical Genetics, Centre for Biomedical Research, University of British Columbia, 2222 Health Sciences Mall, Vancouver, British Columbia, Canada
| | - Pascal Bernatchez
- Department of Anaesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada. .,Centre for Heart and Lung Innovation, St. Paul's Hospital, 1081 Burrard Street, Rm 166, Vancouver, British Columbia, Canada.
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310
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Gao K, Wang Z, Zhou X, Wang H, Kong D, Jiang C, Wang X, Jiang Z, Qiu X. Comparative transcriptome analysis of fast twitch muscle and slow twitch muscle in Takifugu rubripes. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2017; 24:79-88. [PMID: 28886574 DOI: 10.1016/j.cbd.2017.08.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 08/21/2017] [Accepted: 08/22/2017] [Indexed: 12/26/2022]
Abstract
Fast twitch muscle and slow twitch muscle are two important organs of Takifugu rubripes. Both tissues are of ectodermic origin, and the differences between the two muscle fibers reflect the differences in their myofibril protein composition and molecular structure. In order to identify and characterize the gene expression profile in the two muscle fibers of T. rubripes, we generated 54 million and 44 million clean reads from the fast twitch muscle and slow twitch muscle, respectively, using RNA-Seq and identified a total of 580 fast-muscle-specific genes, 1533 slow-muscle-specific genes and 11,806 genes expressed by both muscles. Comparative transcriptome analysis of fast and slow twitch muscles allowed the identification of 1508 differentially expressed genes, of which 34 myosin and 30 ubiquitin family genes were determined. These differentially expressed genes (DEGs) were also analyzed by Ontology (GO) analysis and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway. In addition, alternative splicing analysis was also performed. The generation of larger-scale transcriptomic data presented in this work would enrich the genetic resources of Takifugu rubripes, which could be valuable to comparative studies of muscles.
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Affiliation(s)
- Kailun Gao
- College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Zhicheng Wang
- College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Xiaoxu Zhou
- College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Haoze Wang
- College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Derong Kong
- College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Chen Jiang
- College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Xiuli Wang
- College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Zhiqiang Jiang
- College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
| | - Xuemei Qiu
- College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China.
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311
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What is "Hyper" in the ALS Hypermetabolism? Mediators Inflamm 2017; 2017:7821672. [PMID: 29081604 PMCID: PMC5610793 DOI: 10.1155/2017/7821672] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 07/03/2017] [Indexed: 12/11/2022] Open
Abstract
The progressive and fatal loss of upper (brain) and lower (spinal cord) motor neurons and muscle denervation concisely condenses the clinical picture of amyotrophic lateral sclerosis (ALS). Despite the multiple mechanisms believed to underlie the selective loss of motor neurons, ALS aetiology remains elusive and obscure. Likewise, there is also a cluster of alterations in ALS patients in which muscle wasting, body weight loss, eating dysfunction, and abnormal energy dissipation coexist. Defective energy metabolism characterizes the ALS progression, and such paradox of energy balance stands as a challenge for the understanding of ALS pathogenesis. The hypermetabolism in ALS will be examined from tissue-specific energy imbalance (e.g., skeletal muscle) to major energetic pathways (e.g., AMP-activated protein kinase) and whole-body energy alterations including glucose and lipid metabolism, nutrition, and potential involvement of interorgan communication. From the point of view here expressed, the hypermetabolism in ALS should be evaluated as a magnifying glass through which looking at the ALS pathogenesis is from a different perspective in which defective metabolism can disclose novel mechanistic interpretations and lines of intervention.
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312
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Rehwaldt JD, Rodgers BD, Lin DC. Skeletal muscle contractile properties in a novel murine model for limb girdle muscular dystrophy 2i. J Appl Physiol (1985) 2017; 123:1698-1707. [PMID: 28860175 DOI: 10.1152/japplphysiol.00744.2016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Limb-girdle muscular dystrophy (LGMD) 2i results from mutations in fukutin-related protein and aberrant α-dystroglycan glycosylation. Although this significantly compromises muscle function and ambulation, the comprehensive characteristics of contractile dysfunction are unknown. Therefore, we quantified the in situ contractile properties of the medial gastrocnemius in young adult P448L mice, an affected muscle of a novel model of LGMD2i. Normalized maximal twitch force, tetanic force, and power were significantly smaller in P448L mice, compared with sex-matched, wild-type mice. These differences were consistent with the replacement of contractile fibers by passive tissue. The shape of the active force-length relationships were similar in both groups, regardless of sex, consistent with an intact sarcomeric structure in P448L mice. Passive force-length curves normalized to maximal isometric force were steeper in P448L mice, and passive elements contribute disproportionately more to total contractile force in P448L mice. Sex differences were mostly noted in the force-velocity curves, as normalized values for maximal and optimal velocities were significantly slower in P448L males, compared with wild-type, but not in P448L females. This suggests that the dystrophic phenotype, which may include possible changes in cross-bridge kinetics and fiber-type proportions, progresses more quickly in P448L males. These results together indicate that active force and power generation are compromised in both sexes of P448L mice, while passive forces increase. More importantly, the results identified several functional markers of disease pathophysiology that could aid in developing and assessment of novel therapeutics for LGMD2i and possibly other dystroglycanopathies as well. NEW & NOTEWORTHY Comprehensive assessments of muscle contractile function have, until now, never been performed in an animal model for any dystroglycanopathy. This study suggests that skeletal muscle contractile properties are significantly compromised in a recently developed model for limb-girdle muscular dystrophy 2i, the P448L mouse. It further identifies novel pathological markers of muscle function that are suitable for developing therapeutics and for better understanding of disease pathogenesis.
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Affiliation(s)
- Jordan D Rehwaldt
- Voiland School of Chemical Engineering and Bioengineering, Washington State University , Pullman, Washington
| | - Buel D Rodgers
- Department of Animal Sciences, Washington State University , Pullman, Washington.,Washington Center for Muscle Biology, Washington State University , Pullman, Washington
| | - David C Lin
- Voiland School of Chemical Engineering and Bioengineering, Washington State University , Pullman, Washington.,Department of Integrative Physiology and Neuroscience, Washington State University , Pullman, Washington.,Washington Center for Muscle Biology, Washington State University , Pullman, Washington
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313
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Neppl RL, Wu CL, Walsh K. lncRNA Chronos is an aging-induced inhibitor of muscle hypertrophy. J Cell Biol 2017; 216:3497-3507. [PMID: 28855249 PMCID: PMC5674882 DOI: 10.1083/jcb.201612100] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 06/28/2017] [Accepted: 08/03/2017] [Indexed: 02/07/2023] Open
Abstract
Neppl et al. identify a long noncoding RNA named Chronos whose expression increases with age and decreases in Akt-mediated growth. Inhibition of Chronos induces myofiber hypertrophy in vitro and in vivo, in part, through the epigenetic modulation of Bmp7 signaling. Skeletal muscle exhibits remarkable plasticity in its ability to modulate its mass in response to the physiologic changes associated with functional use, systemic disease, and aging. Although a gradual loss of muscle mass normally occurs with advancing age, its increasingly rapid progression results in sarcopenia in a subset of individuals. The identities of muscle-enriched, long noncoding RNAs that regulate this process are unknown. Here, we identify a long noncoding RNA, named Chronos, whose expression in muscle is positively regulated with advancing age and negatively regulated during Akt1-mediated growth. Inhibition of Chronos induces myofiber hypertrophy both in vitro and in vivo, in part, through the epigenetic modulation of Bmp7 signaling.
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Affiliation(s)
- Ronald L Neppl
- Molecular Cardiology, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA .,Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Chia-Ling Wu
- Molecular Cardiology, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA
| | - Kenneth Walsh
- Molecular Cardiology, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA
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314
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Siqin Q, Nishiumi T, Yamada T, Wang S, Liu W, Wu R, Borjigin G. Relationships among muscle fiber type composition, fiber diameter and MRF gene expression in different skeletal muscles of naturally grazing Wuzhumuqin sheep during postnatal development. Anim Sci J 2017; 88:2033-2043. [PMID: 28730689 PMCID: PMC5763406 DOI: 10.1111/asj.12848] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 04/20/2017] [Indexed: 01/08/2023]
Abstract
The aim of this study was to determine the relationships among muscle fiber‐type composition, fiber diameter, and myogenic regulatory factor (MRF) gene expression in different skeletal muscles during development in naturally grazing Wuzhumuqin sheep. Three major muscles (i.e. the Longissimus dorsi (LD), Biceps femoris (BF) and Triceps brachii (TB)) were obtained from 20 Wuzhumuqin sheep and 20 castrated rams at each of the following ages: 1, 3, 6, 9, 12 and 18 months. Muscle fiber‐type composition and fiber diameter were measured using histochemistry and morphological analysis, and MRF gene expression levels were determined using real‐time PCR. In the LD muscle, changes in the proportion of each of different types of fiber (I, IIA and IIB) were relatively small. In the BF muscle, a higher proportion of type I and a 6.19‐fold lower proportion of type IIA fibers were observed (P < 0.05). In addition, the compositions of type I and IIA fibers continuously changed in the TB muscle (P < 0.05). Moreover, muscle diameter gradually increased throughout development (P < 0.05). Almost no significant difference was found in MRF gene expression patterns, which appeared to be relatively stable. These results suggest that changes in fiber‐type composition and increases in fiber size may be mutually interacting processes during muscle development.
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Affiliation(s)
- Qimuge Siqin
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot, China
| | - Tadayuki Nishiumi
- Division of Life and Food Science, Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Takahisa Yamada
- Division of Life and Food Science, Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Shuiqing Wang
- Mongolian Sheep Animal Husbandry Co., Ltd, Hohhot, China
| | - Wenjun Liu
- Division of Life and Food Science, Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Rihan Wu
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot, China
| | - Gerelt Borjigin
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot, China
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315
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Smerdu V, Perše M. Effect of carcinogen 1,2-dimethylhydrazine treatment on fiber types in skeletal muscles of male Wistar rats. Physiol Res 2017; 66:845-858. [PMID: 28730826 DOI: 10.33549/physiolres.933508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The cancerogen 1,2-dimethylhydrazine (DMH), widely used in the experimental animal model of carcinogenesis, affects various organs, but its effect on muscle fibers is unknown. To evaluate the effect of 15-week DMH treatment on the fiber size and myosin heavy chain (MyHC) isoforms, which substantially determine fiber types and their contractile characteristics, pure and hybrid fiber types were immunohistochemically determined according to the MyHC isoform expression in soleus, extensor digitorum longus, gastrocnemius medialis and lateralis muscles of DMH-treated and control male Wistar rats. Whereas the size of fibers was mostly unaffected, the MyHC isoform expression was partially affected in both gastrocnemius samples, but not in the soleus and extensor digitorum longus of DMH-treated rats. The lower proportions of hybrid fiber types and especially that of type 1/2x in most gastrocnemius samples of DMH-treated rats resulted in a shift towards a single MyHC isoform expression, but the extent and pattern of the MyHC isoform shift varied across the different gastrocnemius samples. Such variable response to DMH treatment across muscles indicates that each muscle possesses its own adaptive range. These findings are essential for an accurate evaluation of skeletal muscle characteristics in DMH animal model.
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Affiliation(s)
- V Smerdu
- Institute of Anatomy, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
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316
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Effects of Functional Electrical Stimulation Lower Extremity Training in Myotonic Dystrophy Type I: A Pilot Controlled Study. Am J Phys Med Rehabil 2017; 95:809-817. [PMID: 27088471 DOI: 10.1097/phm.0000000000000497] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Functional electrical stimulation (FES) is a new rehabilitative approach that combines electrical stimulation with a functional task. This pilot study evaluated the safety and effectiveness of FES lower extremity training in myotonic dystrophy type 1. DESIGN This is a controlled pilot study that enrolled 20 patients with myotonic dystrophy type 1 over 2 years. Eight patients (age, 39-67 years) fulfilled the inclusion criteria. Four participants performed FES cycling training for 15 days (one daily session of 30 minutes for 5 days a week). A control group, matched for clinical and genetic variables, who had contraindications to electrical stimulation, performed 6 weeks of conventional resistance and aerobic training. The modified Medical Research Council Scale and functional assessments were performed before and after treatment. Cohen d effect size was used for statistical analysis. RESULTS Functional electrical stimulation induced lower extremity training was well tolerated and resulted in a greater improvement of tibialis anterior muscle strength (d = 1,583), overall muscle strength (d = 1,723), and endurance (d = 0,626) than conventional training. CONCLUSIONS Functional electrical stimulation might be considered a safe and valid tool to improve muscle function, also in muscles severely compromised in which no other restorative options are available. Confirmation of FES efficacy through further clinical trials is strongly advised.
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317
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Li L, Stampas A, Shin H, Li X, Zhou P. Alterations in Localized Electrical Impedance Myography of Biceps Brachii Muscles Paralyzed by Spinal Cord Injury. Front Neurol 2017; 8:253. [PMID: 28676786 PMCID: PMC5476999 DOI: 10.3389/fneur.2017.00253] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 05/22/2017] [Indexed: 12/13/2022] Open
Abstract
This study assessed electrical impedance myography (EIM) changes after spinal cord injury (SCI) with a localized multifrequency technology. The EIM measurement was performed on the biceps brachii muscle at rest condition of 17 cervical SCI subjects, and 23 neurologically intact subjects as control group. The results showed that there was a significant decrease in muscle reactance (X) and phase angle (θ) at selected frequencies (i.e., 50 and 100 kHz) in SCI compared to control. There was no significant difference in muscle resistance (R) between the two groups. The anisotropy examination revealed that SCI group had a decreased anisotropy ratio in resistance. In addition, the multifrequency spectrum analysis showed a decreased slope of the log(freq)-resistance regression in SCI group when compared to healthy control. Findings of the EIM changes are related to inherit muscle changes after the injury. Since EIM requires no patient effort and is quick and convenient to conduct, it may provide a useful tool for examination of paralyzed muscle changes after SCI.
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Affiliation(s)
- Le Li
- Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, Houston, TX, United States.,TIRR Memorial Hermann Research Center, Houston, TX, United States.,Department of Rehabilitation Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Argyrios Stampas
- Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, Houston, TX, United States.,TIRR Memorial Hermann Research Center, Houston, TX, United States
| | - Henry Shin
- Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, Houston, TX, United States.,TIRR Memorial Hermann Research Center, Houston, TX, United States
| | - Xiaoyan Li
- Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, Houston, TX, United States.,TIRR Memorial Hermann Research Center, Houston, TX, United States
| | - Ping Zhou
- Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, Houston, TX, United States.,TIRR Memorial Hermann Research Center, Houston, TX, United States.,Guangdong Work Injury Rehabilitation Center, Guangzhou, China
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318
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Lang F, Aravamudhan S, Nolte H, Türk C, Hölper S, Müller S, Günther S, Blaauw B, Braun T, Krüger M. Dynamic changes in the mouse skeletal muscle proteome during denervation-induced atrophy. Dis Model Mech 2017; 10:881-896. [PMID: 28546288 PMCID: PMC5536905 DOI: 10.1242/dmm.028910] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 05/16/2017] [Indexed: 01/07/2023] Open
Abstract
Loss of neuronal stimulation enhances protein breakdown and reduces protein synthesis, causing rapid loss of muscle mass. To elucidate the pathophysiological adaptations that occur in atrophying muscles, we used stable isotope labelling and mass spectrometry to quantify protein expression changes accurately during denervation-induced atrophy after sciatic nerve section in the mouse gastrocnemius muscle. Additionally, mice were fed a stable isotope labelling of amino acids in cell culture (SILAC) diet containing 13C6-lysine for 4, 7 or 11 days to calculate relative levels of protein synthesis in denervated and control muscles. Ubiquitin remnant peptides (K-ε-GG) were profiled by immunoaffinity enrichment to identify potential substrates of the ubiquitin-proteasomal pathway. Of the 4279 skeletal muscle proteins quantified, 850 were differentially expressed significantly within 2 weeks after denervation compared with control muscles. Moreover, pulse labelling identified Lys6 incorporation in 4786 proteins, of which 43 had differential Lys6 incorporation between control and denervated muscle. Enrichment of diglycine remnants identified 2100 endogenous ubiquitination sites and revealed a metabolic and myofibrillar protein diglycine signature, including myosin heavy chains, myomesins and titin, during denervation. Comparative analysis of these proteomic data sets with known atrogenes using a random forest approach identified 92 proteins subject to atrogene-like regulation that have not previously been associated directly with denervation-induced atrophy. Comparison of protein synthesis and proteomic data indicated that upregulation of specific proteins in response to denervation is mainly achieved by protein stabilization. This study provides the first integrated analysis of protein expression, synthesis and ubiquitin signatures during muscular atrophy in a living animal. Summary: Comprehensive proteomic profiling of protein expression, synthesis and ubiquitination during skeletal muscle atrophy reveals that complex regulatory networks are activated during muscle wasting.
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Affiliation(s)
- Franziska Lang
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), 50931 Cologne, Germany
| | - Sriram Aravamudhan
- Max Planck Institute for Heart and Lung Research, 61231 Bad Nauheim, Germany
| | - Hendrik Nolte
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), 50931 Cologne, Germany
| | - Clara Türk
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), 50931 Cologne, Germany
| | - Soraya Hölper
- Institute of Biochemistry II, Goethe University Medical School, 60590 Frankfurt, Germany
| | - Stefan Müller
- Center for Molecular Medicine (CMMC), University of Cologne, 50931 Cologne, Germany
| | - Stefan Günther
- Max Planck Institute for Heart and Lung Research, 61231 Bad Nauheim, Germany
| | - Bert Blaauw
- Venetian Institute of Molecular Medicine (VIMM), Department of Biomedical Sciences Padova, University of Padova, 35137 Padova, Italy
| | - Thomas Braun
- Max Planck Institute for Heart and Lung Research, 61231 Bad Nauheim, Germany
| | - Marcus Krüger
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), 50931 Cologne, Germany .,Center for Molecular Medicine (CMMC), University of Cologne, 50931 Cologne, Germany
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319
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Obestatin controls skeletal muscle fiber-type determination. Sci Rep 2017; 7:2137. [PMID: 28522824 PMCID: PMC5437042 DOI: 10.1038/s41598-017-02337-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 04/11/2017] [Indexed: 01/27/2023] Open
Abstract
Obestatin/GPR39 signaling stimulates skeletal muscle growth and repair by inducing both G-protein-dependent and -independent mechanisms linking the activated GPR39 receptor with distinct sets of accessory and effector proteins. In this work, we describe a new level of activity where obestatin signaling plays a role in the formation, contractile properties and metabolic profile of skeletal muscle through determination of oxidative fiber type. Our data indicate that obestatin regulates Mef2 activity and PGC-1α expression. Both mechanisms result in a shift in muscle metabolism and function. The increase in Mef2 and PGC-1α signaling activates oxidative capacity, whereas Akt/mTOR signaling positively regulates myofiber growth. Taken together, these data indicate that the obestatin signaling acts on muscle fiber-type program in skeletal muscle.
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320
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Wright CR, Allsopp GL, Addinsall AB, McRae NL, Andrikopoulos S, Stupka N. A Reduction in Selenoprotein S Amplifies the Inflammatory Profile of Fast-Twitch Skeletal Muscle in the mdx Dystrophic Mouse. Mediators Inflamm 2017; 2017:7043429. [PMID: 28592916 PMCID: PMC5448157 DOI: 10.1155/2017/7043429] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 02/23/2017] [Accepted: 03/07/2017] [Indexed: 12/20/2022] Open
Abstract
Excessive inflammation is a hallmark of muscle myopathies, including Duchenne muscular dystrophy (DMD). There is interest in characterising novel genes that regulate inflammation due to their potential to modify disease progression. Gene polymorphisms in Selenoprotein S (Seps1) are associated with elevated proinflammatory cytokines, and in vitro SEPS1 is protective against inflammatory stress. Given that SEPS1 is highly expressed in skeletal muscle, we investigated whether the genetic reduction of Seps1 exacerbated inflammation in the mdx mouse. F1 male mdx mice with a heterozygous Seps1 deletion (mdx:Seps1-/+) were generated. The mdx:Seps1-/+ mice had a 50% reduction in SEPS1 protein expression in hindlimb muscles. In the extensor digitorum longus (EDL) muscles, mRNA expression of monocyte chemoattractant protein 1 (Mcp-1) (P = 0.034), macrophage marker F4/80 (P = 0.030), and transforming growth factor-β1 (Tgf-β1) (P = 0.056) were increased in mdx:Seps1-/+ mice. This was associated with a reduction in muscle fibre size; however, ex vivo EDL muscle strength and endurance were unaltered. In dystrophic slow twitch soleus muscles, SEPS1 reduction had no effect on the inflammatory profile nor function. In conclusion, the genetic reduction of Seps1 appears to specifically exacerbate the inflammatory profile of fast-twitch muscle fibres, which are typically more vulnerable to degeneration in dystrophy.
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MESH Headings
- Animals
- Blotting, Western
- Body Composition/genetics
- Body Composition/physiology
- Female
- Immunohistochemistry
- Male
- Membrane Proteins/genetics
- Membrane Proteins/metabolism
- Mice
- Mice, Inbred C57BL
- Mice, Inbred mdx
- Muscle Contraction/physiology
- Muscle Fibers, Fast-Twitch/metabolism
- Muscle Fibers, Fast-Twitch/physiology
- Muscle Fibers, Skeletal/metabolism
- Muscle Fibers, Skeletal/physiology
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/physiology
- Muscular Dystrophy, Duchenne/metabolism
- Real-Time Polymerase Chain Reaction
- Selenoproteins/genetics
- Selenoproteins/metabolism
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Affiliation(s)
- Craig Robert Wright
- Institute for Physical Activity and Nutrition Research (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, Australia
| | - Giselle Larissa Allsopp
- Institute for Physical Activity and Nutrition Research (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, Australia
| | - Alex Bernard Addinsall
- Molecular Medical Research SRC, School of Medicine, Deakin University, Geelong, VIC, Australia
| | - Natasha Lee McRae
- Molecular Medical Research SRC, School of Medicine, Deakin University, Geelong, VIC, Australia
| | | | - Nicole Stupka
- Molecular Medical Research SRC, School of Medicine, Deakin University, Geelong, VIC, Australia
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321
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Leitner LM, Wilson RJ, Yan Z, Gödecke A. Reactive Oxygen Species/Nitric Oxide Mediated Inter-Organ Communication in Skeletal Muscle Wasting Diseases. Antioxid Redox Signal 2017; 26:700-717. [PMID: 27835923 PMCID: PMC5421600 DOI: 10.1089/ars.2016.6942] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
SIGNIFICANCE Cachexia is defined as a complex metabolic syndrome that is associated with underlying illness and a loss of muscle with or without loss of fat mass. This disease is associated with a high incidence with chronic diseases such as heart failure, cancer, chronic obstructive pulmonary disease (COPD), and acquired immunodeficiency syndrome (AIDS), among others. Since there is currently no effective treatment available, cachectic patients have a poor prognosis. Elucidation of the underlying mechanisms is, therefore, an important medical task. Recent Advances: There is accumulating evidence that the diseased organs such as heart, lung, kidney, or cancer tissue secrete soluble factors, including Angiotensin II, myostatin (growth differentiation factor 8 [GDF8]), GDF11, tumor growth factor beta (TGFβ), which act on skeletal muscle. There, they induce a set of genes called atrogenes, which, among others, induce the ubiquitin-proteasome system, leading to protein degradation. Moreover, elevated reactive oxygen species (ROS) levels due to modulation of NADPH oxidases (Nox) and mitochondrial function contribute to disease progression, which is characterized by loss of muscle mass, exercise resistance, and frailty. CRITICAL ISSUES Although substantial progress was achieved to elucidate the pathophysiology of cachexia, effectice therapeutic strategies are urgently needed. FUTURE DIRECTIONS With the identification of key components of the aberrant inter-organ communication leading to cachexia, studies in mice and men to inhibit ROS formation, induction of anti-oxidative superoxide dismutases, and upregulation of muscular nitric oxide (NO) formation either by pharmacological tools or by exercise are promising approaches to reduce the extent of skeletal muscle wasting. Antioxid. Redox Signal. 26, 700-717.
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Affiliation(s)
- Lucia M Leitner
- 1 Institut für Herz- und Kreislaufphysiologie, Heinrich-Heine-Universität Düsseldorf, Universitätsklinikum , Düsseldorf, Germany
| | - Rebecca J Wilson
- 2 Department of Medicine-Cardiovascular Medicine, University of Virginia , Charlottesville, Virginia
| | - Zhen Yan
- 2 Department of Medicine-Cardiovascular Medicine, University of Virginia , Charlottesville, Virginia.,3 Center for Skeletal Muscle Research at Robert Berne Cardiovascular Research Center, University of Virginia , Charlottesville, Virginia
| | - Axel Gödecke
- 1 Institut für Herz- und Kreislaufphysiologie, Heinrich-Heine-Universität Düsseldorf, Universitätsklinikum , Düsseldorf, Germany
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322
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Dietary supplementation with bovine-derived milk fat globule membrane lipids promotes neuromuscular development in growing rats. Nutr Metab (Lond) 2017; 14:9. [PMID: 28127382 PMCID: PMC5259894 DOI: 10.1186/s12986-017-0161-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 01/15/2017] [Indexed: 12/11/2022] Open
Abstract
Background The milk fat globule membrane (MFGM) is primarily composed of polar phospho- and sphingolipids, which have established biological effects on neuroplasticity. The present study aimed to investigate the effect of dietary MFGM supplementation on the neuromuscular system during post-natal development. Methods Growing rats received dietary supplementation with bovine-derived MFGM mixtures consisting of complex milk lipids (CML), beta serum concentrate (BSC) or a complex milk lipid concentrate (CMLc) (which lacks MFGM proteins) from post-natal day 10 to day 70. Results Supplementation with MFGM mixtures enriched in polar lipids (BSC and CMLc, but not CML) increased the plasma phosphatidylcholine (PC) concentration, with no effect on plasma phosphatidylinositol (PI), phosphatidylethanolamine (PE), phosphatidylserine (PS) or sphingomyelin (SM). In contrast, muscle PC was reduced in rats receiving supplementation with both BSC and CMLc, whereas muscle PI, PE, PS and SM remained unchanged. Rats receiving BSC and CMLc (but not CML) displayed a slow-to-fast muscle fibre type profile shift (MyHCI → MyHCIIa) that was associated with elevated expression of genes involved in myogenic differentiation (myogenic regulatory factors) and relatively fast fibre type specialisation (Myh2 and Nfatc4). Expression of neuromuscular development genes, including nerve cell markers, components of the synaptogenic agrin–LRP4 pathway and acetylcholine receptor subunits, was also increased in muscle of rats supplemented with BSC and CMLc (but not CML). Conclusions These findings demonstrate that dietary supplementation with bovine-derived MFGM mixtures enriched in polar lipids can promote neuromuscular development during post-natal growth in rats, leading to shifts in adult muscle phenotype. Electronic supplementary material The online version of this article (doi:10.1186/s12986-017-0161-y) contains supplementary material, which is available to authorized users.
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323
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Gigliotti D, Xu MC, Davidson MJ, Macdonald PB, Leiter JRS, Anderson JE. Fibrosis, low vascularity, and fewer slow fibers after rotator-cuff injury. Muscle Nerve 2017; 55:715-726. [PMID: 27571286 DOI: 10.1002/mus.25388] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 08/15/2016] [Accepted: 08/23/2016] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Rotator-cuff injury (RCI) represents 50% of shoulder injuries, and prevalence increases with age. Even with successful tendon repair, muscle and joint function may not return. METHODS To explore the dysfunction, supraspinatus and ipsilateral deltoid (control) muscles were biopsied during arthroscopic RCI repair for pair-wise histological and protein-expression studies. RESULTS Supraspinatus showed fiber atrophy (P < 0.0001), fibrosis (by Sirius Red, P = 0.05), reduced vascular density (P < 0.001), and a lower proportion of slow fibers (P < 0.0001) compared with the ipsilateral control muscle. There were also higher levels of atrogin-1 (P = 0.05), vascular endothelial growth factor (VEGF, P < 0.01), and dystrophin (P < 0.008, relative to fiber diameter) versus control. CONCLUSIONS Adaptive changes in vascular endothelial growth factor and dystrophin were likely associated with reduced vascular supply, fatigue resistance, and fibrosis, accompanied by disuse atrophy from mechanical unloading of supraspinatus after tendon tear. Treatment to promote growth and vascularity in atrophic supraspinatus muscle may help improve functional outcome after surgical repair. Muscle Nerve 55: 715-726, 2017.
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Affiliation(s)
- Deanna Gigliotti
- Department of Biological Sciences, Faculty of Science, University of Manitoba, 212 Biological Sciences Building, 50 Sifton Road, Winnipeg, MB, R3T 2N2, Canada
| | - Mark C Xu
- Faculty of Health Sciences College of Medicine Departments of Surgery (Orthopedics) at the University of Manitoba, Winnipeg, Canada
| | - Michael J Davidson
- Faculty of Health Sciences College of Medicine Department of Radiology at the University of Manitoba, Winnipeg, Canada
| | - Peter B Macdonald
- Faculty of Health Sciences College of Medicine Departments of Surgery (Orthopedics) at the University of Manitoba, Winnipeg, Canada.,Pan Am Clinic, Winnipeg, Canada
| | - Jeff R S Leiter
- Faculty of Health Sciences College of Medicine Departments of Surgery (Orthopedics) at the University of Manitoba, Winnipeg, Canada.,Pan Am Clinic, Winnipeg, Canada
| | - Judy E Anderson
- Department of Biological Sciences, Faculty of Science, University of Manitoba, 212 Biological Sciences Building, 50 Sifton Road, Winnipeg, MB, R3T 2N2, Canada
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324
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Hardee JP, Carson JA. Understanding Sarcopenia Development: A Role for Healthy Behaviors. Am J Lifestyle Med 2017; 11:17-20. [PMID: 28819350 DOI: 10.1177/1559827616674163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
For decades the biomedical community has documented the accelerated loss of muscle mass that occurs with advancing aging, termed sarcopenia. The timely review article ("Attenuation of Adverse Effects of Aging on Skeletal Muscle by Regular Exercise and Nutritional Support") by Arthur Leon presents our current state of knowledge on the biological processes responsible for age-induced loss of muscle mass and function. This loss of skeletal muscle has critical health implications as it can negatively affect morbidity and mortality. A significant theme throughout the review is that a lifelong commitment to regular physical activity and good dietary habits is extremely important to combat age related reductions in muscle mass and function. However, multi-targeted therapeutic approaches, in conjunction with nutrition and exercise, may be beneficial to prevent or treat sarcopenia. Additionally, while significant progress has been made in our understanding of the molecular and biochemical contributors to sarcopenia, further research using well-controlled clinical trials are needed to determine the long-term benefit of exercise and nutrition on aging skeletal muscle.
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Affiliation(s)
- Justin P Hardee
- Integrative Muscle Biology Laboratory, Division of Applied Physiology, Department of Exercise Science, University of South Carolina, Columbia, SC
| | - James A Carson
- Integrative Muscle Biology Laboratory, Division of Applied Physiology, Department of Exercise Science, University of South Carolina, Columbia, SC
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325
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Hildebrandt M, Fankhauser G, Meichtry A, Luomajoki H. Correlation between lumbar dysfunction and fat infiltration in lumbar multifidus muscles in patients with low back pain. BMC Musculoskelet Disord 2017; 18:12. [PMID: 28068962 PMCID: PMC5223418 DOI: 10.1186/s12891-016-1376-1] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 12/21/2016] [Indexed: 12/17/2022] Open
Abstract
Background Lumbar multifidus muscles (LMM) are important for spinal motion and stability. Low back pain (LBP) is often associated with fat infiltration in LMM. An increasing fat infiltration of LMM may lead to lumbar dysfunction. The purpose of this study was to investigate whether there is a correlation between the severity of lumbar dysfunction and the severity of fat infiltration of LMM. Methods In a cross-sectional study, 42 patients with acute or chronic LBP were recruited. Their MRI findings were visually rated and graded using three criteria for fat accumulation in LMM: Grade 0 (0–10%), Grade 1 (10–50%) and Grade 2 (>50%). Lumbar sagittal range of motion, dynamic upright and seated posture control, sagittal movement control, body awareness and self-assessed functional disability were measured to determine the patients’ low back dysfunction. Results The main result of this study was that increased severity of fat infiltration in the lumbar multifidus muscles correlated significantly with decreased range of motion of lumbar flexion (p = 0.032). No significant correlation was found between the severity of fat infiltration in LMM and impaired movement control, posture control, body awareness or self-assessed functional disability. Conclusion This is the first study investigating the relationship between the severity of fat infiltration in LMM and the severity of lumbar dysfunction. The results of this study will contribute to the understanding of the mechanisms leading to fat infiltration of LMM and its relation to spinal function. Further studies should investigate whether specific treatment strategies are effective in reducing or preventing fat infiltration of LMM.
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Affiliation(s)
| | | | - André Meichtry
- Institute of Physiotherapy, School of Health Professions, Zurich University of Applied Sciences, Technikumstrasse 71, 8401, Winterthur, Switzerland
| | - Hannu Luomajoki
- Institute of Physiotherapy, School of Health Professions, Zurich University of Applied Sciences, Technikumstrasse 71, 8401, Winterthur, Switzerland.
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326
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Begue G, Raue U, Jemiolo B, Trappe S. DNA methylation assessment from human slow- and fast-twitch skeletal muscle fibers. J Appl Physiol (1985) 2017; 122:952-967. [PMID: 28057818 DOI: 10.1152/japplphysiol.00867.2016] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 12/07/2016] [Accepted: 12/30/2016] [Indexed: 11/22/2022] Open
Abstract
A new application of the reduced representation bisulfite sequencing method was developed using low-DNA input to investigate the epigenetic profile of human slow- and fast-twitch skeletal muscle fibers. Successful library construction was completed with as little as 15 ng of DNA, and high-quality sequencing data were obtained with 32 ng of DNA. Analysis identified 143,160 differentially methylated CpG sites across 14,046 genes. In both fiber types, selected genes predominantly expressed in slow or fast fibers were hypomethylated, which was supported by the RNA-sequencing analysis. These are the first fiber type-specific methylation data from human skeletal muscle and provide a unique platform for future research.NEW & NOTEWORTHY This study validates a low-DNA input reduced representation bisulfite sequencing method for human muscle biopsy samples to investigate the methylation patterns at a fiber type-specific level. These are the first fiber type-specific methylation data reported from human skeletal muscle and thus provide initial insight into basal state differences in myosin heavy chain I and IIa muscle fibers among young, healthy men.
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Affiliation(s)
- Gwénaëlle Begue
- Human Performance Laboratory, Ball State University, Muncie, Indiana
| | - Ulrika Raue
- Human Performance Laboratory, Ball State University, Muncie, Indiana
| | - Bozena Jemiolo
- Human Performance Laboratory, Ball State University, Muncie, Indiana
| | - Scott Trappe
- Human Performance Laboratory, Ball State University, Muncie, Indiana
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327
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Liu X, Wang Y, Hou L, Xiong Y, Zhao S. Fibroblast Growth Factor 21 (FGF21) Promotes Formation of Aerobic Myofibers via the FGF21-SIRT1-AMPK-PGC1α Pathway. J Cell Physiol 2017; 232:1893-1906. [DOI: 10.1002/jcp.25735] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 12/13/2016] [Indexed: 12/13/2022]
Affiliation(s)
- Xinyi Liu
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of the Ministry of Education and Key Laboratory of Swine Genetics and Breeding of the Ministry of Agriculture; Huazhong Agricultural University; Wuhan Hubei P. R. China
| | - Yongliang Wang
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of the Ministry of Education and Key Laboratory of Swine Genetics and Breeding of the Ministry of Agriculture; Huazhong Agricultural University; Wuhan Hubei P. R. China
| | - Liming Hou
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of the Ministry of Education and Key Laboratory of Swine Genetics and Breeding of the Ministry of Agriculture; Huazhong Agricultural University; Wuhan Hubei P. R. China
| | - Yuanzhu Xiong
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of the Ministry of Education and Key Laboratory of Swine Genetics and Breeding of the Ministry of Agriculture; Huazhong Agricultural University; Wuhan Hubei P. R. China
| | - Shuhong Zhao
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of the Ministry of Education and Key Laboratory of Swine Genetics and Breeding of the Ministry of Agriculture; Huazhong Agricultural University; Wuhan Hubei P. R. China
- The Cooperative Innovation Center for Sustainable Pig Production; Wuhan Hubei P. R. China
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328
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Hessel AL, Nishikawa KC. Effects of a titin mutation on negative work during stretch-shortening cycles in skeletal muscles. J Exp Biol 2017; 220:4177-4185. [DOI: 10.1242/jeb.163204] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 09/15/2017] [Indexed: 01/17/2023]
Abstract
Negative work occurs in muscles during braking movements such as downhill walking or landing after a jump. When performing negative work during stretch-shortening cycles, viscoelastic structures within muscles store energy during stretch, return a fraction of this energy during shortening, and dissipate the remaining energy as heat. Because tendons and extracellular matrix are relatively elastic rather than viscoelastic, energy is mainly dissipated by cross bridges and titin. Recent studies demonstrate that titin stiffness increases in active skeletal muscles, suggesting that titin contributions to negative work may have been underestimated in previous studies. The muscular dystrophy with myositis (mdm) mutation in mice results in a deletion in titin that leads to reduced titin stiffness in active muscle, providing an opportunity to investigate the contribution of titin to negative work in stretch-shortening cycles. Using the work loop technique, extensor digitorum longus and soleus muscles from mdm and wild type mice were stimulated during the stretch phase of stretch-shortening cycles to investigate negative work. The results demonstrate that, compared to wild type muscles, negative work is reduced in muscles from mdm mice. We suggest that changes in the viscoelastic properties of mdm titin reduce energy storage by muscles during stretch and energy dissipation during shortening. Maximum isometric stress is also reduced in muscles from mdm mice, possibly due to impaired transmission of cross bridge force, impaired cross bridge function, or both. Functionally, the reduction in negative work could lead to increased muscle damage during eccentric contractions that occur during braking movements.
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Affiliation(s)
- Anthony L. Hessel
- Center for Bioengineering Innovation and Department of Biological Sciences, Northern Arizona University, PO Box 4185, Flagstaff, AZ 86011, USA
| | - Kiisa C. Nishikawa
- Center for Bioengineering Innovation and Department of Biological Sciences, Northern Arizona University, PO Box 4185, Flagstaff, AZ 86011, USA
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329
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330
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Wang S, Seaberg B, Paez-Colasante X, Rimer M. Defective Acetylcholine Receptor Subunit Switch Precedes Atrophy of Slow-Twitch Skeletal Muscle Fibers Lacking ERK1/2 Kinases in Soleus Muscle. Sci Rep 2016; 6:38745. [PMID: 27934942 PMCID: PMC5146667 DOI: 10.1038/srep38745] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 11/15/2016] [Indexed: 01/10/2023] Open
Abstract
To test the role of extracellular-signal regulated kinases 1 and 2 (ERK1/2) in slow-twitch, type 1 skeletal muscle fibers, we studied the soleus muscle in mice genetically deficient for myofiber ERK1/2. Young adult mutant soleus was drastically wasted, with highly atrophied type 1 fibers, denervation at most synaptic sites, induction of “fetal” acetylcholine receptor gamma subunit (AChRγ), reduction of “adult” AChRε, and impaired mitochondrial biogenesis and function. In weanlings, fiber morphology and mitochondrial markers were mostly normal, yet AChRγ upregulation and AChRε downregulation were observed. Synaptic sites with fetal AChRs in weanling muscle were ~3% in control and ~40% in mutants, with most of the latter on type 1 fibers. These results suggest that: (1) ERK1/2 are critical for slow-twitch fiber growth; (2) a defective γ/ε-AChR subunit switch, preferentially at synapses on slow fibers, precedes wasting of mutant soleus; (3) denervation is likely to drive this wasting, and (4) the neuromuscular synapse is a primary subcellular target for muscle ERK1/2 function in vivo.
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Affiliation(s)
- Shuo Wang
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, Texas, USA
| | - Bonnie Seaberg
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, Texas, USA
| | - Ximena Paez-Colasante
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, Texas, USA
| | - Mendell Rimer
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, Texas, USA
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331
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Effect of the Lipoxygenase Inhibitor Baicalein on Muscles in Ovariectomized Rats. J Nutr Metab 2016; 2016:3703216. [PMID: 28050282 PMCID: PMC5165164 DOI: 10.1155/2016/3703216] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 10/27/2016] [Indexed: 01/21/2023] Open
Abstract
Sarcopenia, a loss of muscle mass accompanying osteoporosis, leads to falls and fall-related injuries. Baicalein, as a phytochemical agent, has an antioxidative and anti-inflammatory effect in muscle. In this study, sixty-one female Sprague Dawley rats were divided into five groups: four groups were ovariectomized (OVX) and one control group was nonovariectomized (NON-OVX). Eight weeks after ovariectomy, three disparate concentrations (1 mg/kg body weight (BW), 10 mg/kg BW, and 100 mg/kg BW) of baicalein were applied subcutaneously daily in three OVX groups. Mm. soleus, gastrocnemius, and longissimus were extracted; their diameter, area, relation to body, and muscle weights as well as number of capillaries per fibre were recorded. In Mm. soleus and gastrocnemius, the baicalein effect (increasing number of capillaries per fibre) was proportional to the dose applied. The fibre diameters and area under baicalein treatment were significantly greater compared to OVX and NON-OVX groups. In M. longissimus, we observed a shift to type IIa fibres. Serum creatine kinase levels were significantly lower in highest baicalein concentration group. We conclude that baicalein can stimulate angiogenesis, though not fibre type-specific, in skeletal muscle and reduce the estrogen-related loss of fibre diameter and area in the skeletal muscle in rats. Therefore, a protective effect of baicalein on muscle cells can be assumed.
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332
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Saitoh M, dos Santos MR, Anker M, Anker SD, von Haehling S, Springer J. Neuromuscular electrical stimulation for muscle wasting in heart failure patients. Int J Cardiol 2016; 225:200-205. [DOI: 10.1016/j.ijcard.2016.09.127] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 09/30/2016] [Indexed: 12/12/2022]
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333
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Bannerman P, Burns T, Xu J, Miers L, Pleasure D. Mice Hemizygous for a Pathogenic Mitofusin-2 Allele Exhibit Hind Limb/Foot Gait Deficits and Phenotypic Perturbations in Nerve and Muscle. PLoS One 2016; 11:e0167573. [PMID: 27907123 PMCID: PMC5132404 DOI: 10.1371/journal.pone.0167573] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 11/16/2016] [Indexed: 12/31/2022] Open
Abstract
Charcot-Marie-Tooth disease type 2A (CMT2A), the most common axonal form of hereditary sensory motor neuropathy, is caused by mutations of mitofusin-2 (MFN2). Mitofusin-2 is a GTPase required for fusion of mitochondrial outer membranes, repair of damaged mitochondria, efficient mitochondrial energetics, regulation of mitochondrial-endoplasmic reticulum calcium coupling and axonal transport of mitochondria. We knocked T105M MFN2 preceded by a loxP-flanked STOP sequence into the mouse Rosa26 locus to permit cell type-specific expression of this pathogenic allele. Crossing these mice with nestin-Cre transgenic mice elicited T105M MFN2 expression in neuroectoderm, and resulted in diminished numbers of mitochondria in peripheral nerve axons, an alteration in skeletal muscle fiber type distribution, and a gait abnormality.
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Affiliation(s)
- Peter Bannerman
- Institute for Pediatric Regenerative Medicine, Shriners Hospitals for Children, Northern California, Sacramento, California, United States of America
- Department of Cell Biology and Human Anatomy, University of California Davis, Davis, California, United States of America
- * E-mail:
| | - Travis Burns
- Department of Neurology, University of California Davis, Sacramento, California, United States of America
| | - Jie Xu
- Department of Neurology, University of California Davis, Sacramento, California, United States of America
| | - Laird Miers
- Department of Neurology, University of California Davis, Sacramento, California, United States of America
| | - David Pleasure
- Institute for Pediatric Regenerative Medicine, Shriners Hospitals for Children, Northern California, Sacramento, California, United States of America
- Department of Neurology, University of California Davis, Sacramento, California, United States of America
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334
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Capitanio D, Vasso M, De Palma S, Fania C, Torretta E, Cammarata FP, Magnaghi V, Procacci P, Gelfi C. Specific protein changes contribute to the differential muscle mass loss during ageing. Proteomics 2016; 16:645-56. [PMID: 26698593 DOI: 10.1002/pmic.201500395] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Revised: 11/12/2015] [Accepted: 12/16/2015] [Indexed: 11/11/2022]
Abstract
In the skeletal muscle, the ageing process is characterized by a loss of muscle mass and strength, coupled with a decline of mitochondrial function and a decrease of satellite cells. This profile is more pronounced in hindlimb than in forelimb muscles, both in humans and in rodents. Utilizing light and electron microscopy, myosin heavy chain isoform distribution, proteomic analysis by 2D-DIGE, MALDI-TOF MS and quantitative immunoblotting, this study analyzes the protein levels and the nuclear localization of specific molecules, which can contribute to a preferential muscle loss. Our results identify the molecular changes in the hindlimb (gastrocnemius) and forelimb (triceps) muscles during ageing in rats (3- and 22-month-old). Specifically, the oxidative metabolism contributes to tissue homeostasis in triceps, whereas respiratory chain disruption and oxidative-stress-induced damage imbalance the homeostasis in gastrocnemius muscle. High levels of dihydrolipoyllysine-residue acetyltransferase (Dlat) and ATP synthase subunit alpha (Atp5a1) are detected in triceps and gastrocnemius, respectively. Interestingly, in triceps, both molecules are increased in the nucleus in aged rats and are associated to an increased protein acetylation and myoglobin availability. Furthermore, autophagy is retained in triceps whereas an enhanced fusion, decrement of mitophagy and of regenerative potential is observed in aged gastrocnemius muscle.
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Affiliation(s)
- Daniele Capitanio
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy.,IRCCS Policlinico San Donato, San Donato Milanese (MI), Italy
| | - Michele Vasso
- Institute of Bioimaging and Molecular Physiology, National Research Council, Segrate (MI) - Cefalù (PA), Italy
| | - Sara De Palma
- Institute of Bioimaging and Molecular Physiology, National Research Council, Segrate (MI) - Cefalù (PA), Italy
| | - Chiara Fania
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy.,IRCCS Policlinico San Donato, San Donato Milanese (MI), Italy
| | - Enrica Torretta
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy.,IRCCS Policlinico San Donato, San Donato Milanese (MI), Italy
| | - Francesco P Cammarata
- Institute of Bioimaging and Molecular Physiology, National Research Council, Segrate (MI) - Cefalù (PA), Italy
| | - Valerio Magnaghi
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy
| | - Patrizia Procacci
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy
| | - Cecilia Gelfi
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy.,IRCCS Policlinico San Donato, San Donato Milanese (MI), Italy.,Institute of Bioimaging and Molecular Physiology, National Research Council, Segrate (MI) - Cefalù (PA), Italy
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335
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Yoshikawa N, Shimizu N, Uehara M, Oda A, Matsumiya R, Matsubara E, Kobayashi H, Hosono O, Kuribara-Souta A, Baba H, Nagamura F, Kiryu S, Tanaka H. The effects of bolus supplementation of branched-chain amino acids on skeletal muscle mass, strength, and function in patients with rheumatic disorders during glucocorticoid treatment. Mod Rheumatol 2016; 27:508-517. [PMID: 27678151 DOI: 10.1080/14397595.2016.1213480] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVES To test the effects of bolus supplementation of branched-chain amino acids (BCAA) on skeletal muscle mass, strength, and function in patients with rheumatic disorders taking glucocorticoid (GC). METHODS Patients with rheumatic disorders treated with prednisolone (≥10 mg/day) were randomized to ingest additional daily 12 g of BCAA (n = 9) or not (n = 9) for 12 weeks. At baseline, and 4, 8, and 12 weeks, they underwent bioelectrical impedance analysis, muscle strength and functional tests, and computed tomography analysis for cross-sectional area of mid-thigh muscle. RESULTS Disease activities of the patients were well controlled and daily GC dose was similarly reduced in both groups. Limb muscle mass was recovered in both groups. Whole-body muscle mass and muscle strength and functional mobility were increased only in BCAA (+) group. The effects of BCAA supplementation on recovering skeletal muscle mass were prominent in particular muscles including biceps femoris muscle. CONCLUSIONS This trial is the first-in-man clinical trial to demonstrate that BCAA supplementation might be safe and, at least in part, improve skeletal muscle mass, strength, and function in patients with rheumatic disorders treated with GC.
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Affiliation(s)
| | - Noriaki Shimizu
- a Department of Rheumatology and Allergy.,b Division of Rheumatology, Center for Antibody and Vaccine Therapy
| | | | - Aya Oda
- a Department of Rheumatology and Allergy
| | | | | | | | | | | | | | | | - Shigeru Kiryu
- d Department of Radiology , IMSUT Hospital, Institute of Medical Science, the University of Tokyo , Shirokanedai , Minato-ku , Tokyo , Japan
| | - Hirotoshi Tanaka
- a Department of Rheumatology and Allergy.,b Division of Rheumatology, Center for Antibody and Vaccine Therapy
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336
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Noehren B, Andersen A, Hardy P, Johnson DL, Ireland ML, Thompson KL, Damon B. Cellular and Morphological Alterations in the Vastus Lateralis Muscle as the Result of ACL Injury and Reconstruction. J Bone Joint Surg Am 2016; 98:1541-7. [PMID: 27655981 PMCID: PMC5026157 DOI: 10.2106/jbjs.16.00035] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Individuals who have had an anterior cruciate ligament (ACL) tear and reconstruction continue to experience substantial knee extensor strength loss despite months of physical therapy. Identification of the alterations in muscle morphology and cellular composition are needed to understand potential mechanisms of muscle strength loss, initially as the result of the injury and subsequently from surgery and rehabilitation. METHODS We performed diffusion tensor imaging-magnetic resonance imaging and analyzed muscle biopsies from the vastus lateralis of both the affected and unaffected limbs before surgery and again from the reconstructed limb following the completion of rehabilitation. Immunohistochemistry was done to determine fiber type and size, Pax-7-positive (satellite) cells, and extracellular matrix (via wheat germ agglutinin straining). Using the diffusion tensor imaging data, the fiber tract length, pennation angle, and muscle volume were determined, yielding the physiological cross-sectional area (PCSA). Paired t tests were used to compare the effects of the injury between injured and uninjured limbs and the effects of surgery and rehabilitation within the injured limb. RESULTS We found significant reductions before surgery in type-IIA muscle cross-sectional area (CSA; p = 0.03), extracellular matrix (p < 0.01), satellite cells per fiber (p < 0.01), pennation angle (p = 0.03), muscle volume (p = 0.02), and PCSA (p = 0.03) in the injured limb compared with the uninjured limb. Following surgery, these alterations in the injured limb persisted and the frequency of the IIA fiber type decreased significantly (p < 0.01) and that of the IIA/X hybrid fiber type increased significantly (p < 0.01). CONCLUSIONS Significant and prolonged differences in muscle quality and morphology occurred after ACL injury and persisted despite reconstruction and extensive physical therapy. CLINICAL RELEVANCE These results suggest the need to develop more effective early interventions following an ACL tear to prevent deleterious alterations within the quadriceps.
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Affiliation(s)
- Brian Noehren
- Departments of Rehabilitation Sciences (B.N.), Anatomy and Neurobiology (A.A. and P.H.), Radiology (P.H.), Orthopaedic Surgery (A.A. and P.H.), Sports Medicine (D.L.J. and M.L.I.), and Statistics (K.L.T.), University of Kentucky, Lexington, Kentucky,E-mail address for B. Noehren:
| | - Anders Andersen
- Departments of Rehabilitation Sciences (B.N.), Anatomy and Neurobiology (A.A. and P.H.), Radiology (P.H.), Orthopaedic Surgery (A.A. and P.H.), Sports Medicine (D.L.J. and M.L.I.), and Statistics (K.L.T.), University of Kentucky, Lexington, Kentucky
| | - Peter Hardy
- Departments of Rehabilitation Sciences (B.N.), Anatomy and Neurobiology (A.A. and P.H.), Radiology (P.H.), Orthopaedic Surgery (A.A. and P.H.), Sports Medicine (D.L.J. and M.L.I.), and Statistics (K.L.T.), University of Kentucky, Lexington, Kentucky
| | - Darren L. Johnson
- Departments of Rehabilitation Sciences (B.N.), Anatomy and Neurobiology (A.A. and P.H.), Radiology (P.H.), Orthopaedic Surgery (A.A. and P.H.), Sports Medicine (D.L.J. and M.L.I.), and Statistics (K.L.T.), University of Kentucky, Lexington, Kentucky
| | - Mary Lloyd Ireland
- Departments of Rehabilitation Sciences (B.N.), Anatomy and Neurobiology (A.A. and P.H.), Radiology (P.H.), Orthopaedic Surgery (A.A. and P.H.), Sports Medicine (D.L.J. and M.L.I.), and Statistics (K.L.T.), University of Kentucky, Lexington, Kentucky
| | - Katherine L. Thompson
- Departments of Rehabilitation Sciences (B.N.), Anatomy and Neurobiology (A.A. and P.H.), Radiology (P.H.), Orthopaedic Surgery (A.A. and P.H.), Sports Medicine (D.L.J. and M.L.I.), and Statistics (K.L.T.), University of Kentucky, Lexington, Kentucky
| | - Bruce Damon
- Institute of Imaging Science and Departments of Biomedical Engineering and Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee
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Fröhlich T, Kemter E, Flenkenthaler F, Klymiuk N, Otte KA, Blutke A, Krause S, Walter MC, Wanke R, Wolf E, Arnold GJ. Progressive muscle proteome changes in a clinically relevant pig model of Duchenne muscular dystrophy. Sci Rep 2016; 6:33362. [PMID: 27634466 PMCID: PMC5025886 DOI: 10.1038/srep33362] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Accepted: 08/24/2016] [Indexed: 01/16/2023] Open
Abstract
Duchenne muscular dystrophy (DMD) is caused by genetic deficiency of dystrophin and characterized by massive structural and functional changes of skeletal muscle tissue, leading to terminal muscle failure. We recently generated a novel genetically engineered pig model reflecting pathological hallmarks of human DMD better than the widely used mdx mouse. To get insight into the hierarchy of molecular derangements during DMD progression, we performed a proteome analysis of biceps femoris muscle samples from 2-day-old and 3-month-old DMD and wild-type (WT) pigs. The extent of proteome changes in DMD vs. WT muscle increased markedly with age, reflecting progression of the pathological changes. In 3-month-old DMD muscle, proteins related to muscle repair such as vimentin, nestin, desmin and tenascin C were found to be increased, whereas a large number of respiratory chain proteins were decreased in abundance in DMD muscle, indicating serious disturbances in aerobic energy production and a reduction of functional muscle tissue. The combination of proteome data for fiber type specific myosin heavy chain proteins and immunohistochemistry showed preferential degeneration of fast-twitch fiber types in DMD muscle. The stage-specific proteome changes detected in this large animal model of clinically severe muscular dystrophy provide novel molecular readouts for future treatment trials.
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Affiliation(s)
- Thomas Fröhlich
- Laboratory for Functional Genome Analysis (LAFUGA), Gene Center, LMU Munich, Feodor-Lynen-Str. 25, D-81377 Munich, Germany
| | - Elisabeth Kemter
- Chair for Molecular Animal Breeding and Biotechnology, Gene Center and Department of Veterinary Sciences, LMU Munich, Feodor-Lynen-Str. 25, D-81377 Munich, Germany
| | - Florian Flenkenthaler
- Laboratory for Functional Genome Analysis (LAFUGA), Gene Center, LMU Munich, Feodor-Lynen-Str. 25, D-81377 Munich, Germany
| | - Nikolai Klymiuk
- Chair for Molecular Animal Breeding and Biotechnology, Gene Center and Department of Veterinary Sciences, LMU Munich, Feodor-Lynen-Str. 25, D-81377 Munich, Germany
| | - Kathrin A Otte
- Laboratory for Functional Genome Analysis (LAFUGA), Gene Center, LMU Munich, Feodor-Lynen-Str. 25, D-81377 Munich, Germany
| | - Andreas Blutke
- Institute of Veterinary Pathology, Centre for Clinical Veterinary Medicine, LMU Munich, Veterinärstr. 13, D-80539 Munich, Germany
| | - Sabine Krause
- Friedrich-Baur-Institute, Department of Neurology, LMU Munich, Ziemssenstr. 1, D-80336 Munich, Germany
| | - Maggie C Walter
- Friedrich-Baur-Institute, Department of Neurology, LMU Munich, Ziemssenstr. 1, D-80336 Munich, Germany
| | - Rüdiger Wanke
- Institute of Veterinary Pathology, Centre for Clinical Veterinary Medicine, LMU Munich, Veterinärstr. 13, D-80539 Munich, Germany
| | - Eckhard Wolf
- Laboratory for Functional Genome Analysis (LAFUGA), Gene Center, LMU Munich, Feodor-Lynen-Str. 25, D-81377 Munich, Germany.,Chair for Molecular Animal Breeding and Biotechnology, Gene Center and Department of Veterinary Sciences, LMU Munich, Feodor-Lynen-Str. 25, D-81377 Munich, Germany
| | - Georg J Arnold
- Laboratory for Functional Genome Analysis (LAFUGA), Gene Center, LMU Munich, Feodor-Lynen-Str. 25, D-81377 Munich, Germany
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338
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Bursac N, Juhas M, Rando TA. Synergizing Engineering and Biology to Treat and Model Skeletal Muscle Injury and Disease. Annu Rev Biomed Eng 2016; 17:217-42. [PMID: 26643021 DOI: 10.1146/annurev-bioeng-071114-040640] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Although skeletal muscle is one of the most regenerative organs in our body, various genetic defects, alterations in extrinsic signaling, or substantial tissue damage can impair muscle function and the capacity for self-repair. The diversity and complexity of muscle disorders have attracted much interest from both cell biologists and, more recently, bioengineers, leading to concentrated efforts to better understand muscle pathology and develop more efficient therapies. This review describes the biological underpinnings of muscle development, repair, and disease, and discusses recent bioengineering efforts to design and control myomimetic environments, both to study muscle biology and function and to aid in the development of new drug, cell, and gene therapies for muscle disorders. The synergy between engineering-aided biological discovery and biology-inspired engineering solutions will be the path forward for translating laboratory results into clinical practice.
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Affiliation(s)
- Nenad Bursac
- Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708;
| | - Mark Juhas
- Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708;
| | - Thomas A Rando
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, California 94305.,Rehabilitation Research & Development Service, VA Palo Alto Health Care System, Palo Alto, California 94304
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339
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Chen JL, Colgan TD, Walton KL, Gregorevic P, Harrison CA. The TGF-β Signalling Network in Muscle Development, Adaptation and Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 900:97-131. [PMID: 27003398 DOI: 10.1007/978-3-319-27511-6_5] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Skeletal muscle possesses remarkable ability to change its size and force-producing capacity in response to physiological stimuli. Impairment of the cellular processes that govern these attributes also affects muscle mass and function in pathological conditions. Myostatin, a member of the TGF-β family, has been identified as a key regulator of muscle development, and adaptation in adulthood. In muscle, myostatin binds to its type I (ALK4/5) and type II (ActRIIA/B) receptors to initiate Smad2/3 signalling and the regulation of target genes that co-ordinate the balance between protein synthesis and degradation. Interestingly, evidence is emerging that other TGF-β proteins act in concert with myostatin to regulate the growth and remodelling of skeletal muscle. Consequently, dysregulation of TGF-β proteins and their associated signalling components is increasingly being implicated in muscle wasting associated with chronic illness, ageing, and inactivity. The growing understanding of TGF-β biology in muscle, and its potential to advance the development of therapeutics for muscle-related conditions is reviewed here.
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Affiliation(s)
- Justin L Chen
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, VIC, 3168, Australia.,Department of Molecular and Translational Sciences, Monash University, Melbourne, VIC, Australia.,Muscle Research and Therapeutics Development, Baker IDI Heart and Diabetes Institute, Melbourne, VIC, 3004, Australia.,Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC, Australia
| | - Timothy D Colgan
- Muscle Research and Therapeutics Development, Baker IDI Heart and Diabetes Institute, Melbourne, VIC, 3004, Australia.,Department of Physiology, The University of Melbourne, Melbourne, VIC, Australia
| | - Kelly L Walton
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, VIC, 3168, Australia.,Department of Molecular and Translational Sciences, Monash University, Melbourne, VIC, Australia
| | - Paul Gregorevic
- Muscle Research and Therapeutics Development, Baker IDI Heart and Diabetes Institute, Melbourne, VIC, 3004, Australia. .,Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC, Australia. .,Department of Physiology, The University of Melbourne, Melbourne, VIC, Australia. .,Department of Neurology, School of Medicine, The University of Washington, Seattle, WA, USA.
| | - Craig A Harrison
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Clayton, VIC, 3168, Australia. .,Department of Molecular and Translational Sciences, Monash University, Melbourne, VIC, Australia. .,Department of Physiology, Monash University, Melbourne, VIC, Australia.
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340
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Ferraro E, Pin F, Gorini S, Pontecorvo L, Ferri A, Mollace V, Costelli P, Rosano G. Improvement of skeletal muscle performance in ageing by the metabolic modulator Trimetazidine. J Cachexia Sarcopenia Muscle 2016; 7:449-57. [PMID: 27239426 PMCID: PMC4864287 DOI: 10.1002/jcsm.12097] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 08/02/2015] [Accepted: 11/02/2015] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND The loss of muscle mass (sarcopenia) and the associated reduced muscle strength are key limiting factors for elderly people's quality of life. Improving muscle performance does not necessarily correlate with increasing muscle mass. In fact, particularly in the elderly, the main explanation for muscle weakness is a reduction of muscle quality rather than a loss of muscle mass, and the main goal to be achieved is to increase muscle strength. The effectiveness of Trimetazidine (TMZ) in preventing muscle functional impairment during ageing was assessed in our laboratory. METHODS Aged mice received TMZ or vehicle for 12 consecutive days. Muscle function was evaluated at the end of the treatment by a grip test as well as by an inverted screen test at 0, 5, 7 and 12 days of TMZ treatment. After sacrifice, muscles were stored for myofiber cross-sectional area assessment and myosin heavy chain expression evaluation by western blotting. RESULTS Chronic TMZ treatment does not affect the mass of both gastrocnemius and tibialis anterior muscles, while it significantly increases muscle strength. Indeed, both latency to fall and grip force are markedly enhanced in TMZ-treated versus untreated mice. In addition, TMZ administration results in higher expression of slow myosin heavy chain isoform and increased number of small-sized myofibers. CONCLUSIONS We report here some data showing that the modulation of skeletal muscle metabolism by TMZ increases muscle strength in aged mice. Reprogramming metabolism might therefore be a strategy worth to be further investigated in view of improving muscle performance in the elderly.
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Affiliation(s)
- Elisabetta Ferraro
- Laboratory of Pathophysiology of Cachexia and Metabolism of Skeletal Muscle IRCCS San Raffaele Pisana Rome Italy
| | - Fabrizio Pin
- Department of Clinical and Biological Sciences University of Turin Turin Italy; Istituto Interuniversitario di Miologia-IIM IIM Italy
| | - Stefania Gorini
- Laboratory of Pathophysiology of Cachexia and Metabolism of Skeletal Muscle IRCCS San Raffaele Pisana Rome Italy
| | - Laura Pontecorvo
- Laboratory of Pathophysiology of Cachexia and Metabolism of Skeletal Muscle IRCCS San Raffaele Pisana Rome Italy
| | - Alberto Ferri
- Institute of Cell Biology and Neurobiology CNR Rome Italy
| | - Vincenzo Mollace
- Department of Pharmacobiological Sciences University Magna Graecia Catanzaro Italy
| | - Paola Costelli
- Department of Clinical and Biological Sciences University of Turin Turin Italy; Istituto Interuniversitario di Miologia-IIM IIM Italy
| | - Giuseppe Rosano
- Laboratory of Pathophysiology of Cachexia and Metabolism of Skeletal MuscleI RCCS San Raffaele Pisana Rome Italy; Cardiovascular and Cell Sciences Institute St George's University of London London UK
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341
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Marzuca-Nassr GN, Vitzel KF, De Sousa LG, Murata GM, Crisma AR, Rodrigues Junior CF, Abreu P, Torres RP, Mancini-Filho J, Hirabara SM, Newsholme P, Curi R. Effects of high EPA and high DHA fish oils on changes in signaling associated with protein metabolism induced by hindlimb suspension in rats. Physiol Rep 2016; 4:e12958. [PMID: 27650250 PMCID: PMC5037913 DOI: 10.14814/phy2.12958] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Revised: 08/09/2016] [Accepted: 08/11/2016] [Indexed: 12/16/2022] Open
Abstract
The effects of either eicosapentaenoic (EPA)- or docosahexaenoic (DHA)-rich fish oils on hindlimb suspension (HS)-induced muscle disuse atrophy were compared. Daily oral supplementations (0.3 mL/100 g b.w.) with mineral oil (MO) or high EPA or high DHA fish oils were performed in adult rats. After 2 weeks, the animals were subjected to HS for further 2 weeks. The treatments were maintained alongside HS At the end of 4 weeks, we evaluated: body weight gain, muscle mass and fat depots, composition of fatty acids, cross-sectional areas (CSA) of the soleus muscle and soleus muscle fibers, activities of cathepsin L and 26S proteasome, and content of carbonylated proteins in the soleus muscle. Signaling pathway activities associated with protein synthesis (Akt, p70S6K, S6, 4EBP1, and GSK3-beta) and protein degradation (atrogin-1/MAFbx, and MuRF1) were evaluated. HS decreased muscle mass, CSA of soleus muscle and soleus muscle fibers, and altered signaling associated with protein synthesis (decreased) and protein degradation (increased). The treatment with either fish oil decreased the ratio of omega-6/omega-3 fatty acids and changed protein synthesis-associated signaling. EPA-rich fish oil attenuated the changes induced by HS on 26S proteasome activity, CSA of soleus muscle fibers, and levels of p-Akt, total p70S6K, p-p70S6K/total p70S6K, p-4EBP1, p-GSK3-beta, p-ERK2, and total ERK 1/2 proteins. DHA-rich fish oil attenuated the changes induced by HS on p-4EBP1 and total ERK1 levels. The effects of EPA-rich fish oil on protein synthesis signaling were more pronounced. Both EPA- and DHA-rich fish oils did not impact skeletal muscle mass loss induced by non-inflammatory HS.
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Affiliation(s)
- Gabriel Nasri Marzuca-Nassr
- Department of Physiology and Biophysics, Institute of Biomedical Sciences University of São Paulo, São Paulo, Brazil
| | - Kaio Fernando Vitzel
- Department of Physiology and Biophysics, Institute of Biomedical Sciences University of São Paulo, São Paulo, Brazil Massey Institute of Food Science and Technology, College of Health Massey University, Albany, New Zealand
| | - Luís Gustavo De Sousa
- Department of Physiology and Biophysics, Institute of Biomedical Sciences University of São Paulo, São Paulo, Brazil
| | - Gilson M Murata
- Department of Physiology and Biophysics, Institute of Biomedical Sciences University of São Paulo, São Paulo, Brazil
| | - Amanda Rabello Crisma
- Department of Physiology and Biophysics, Institute of Biomedical Sciences University of São Paulo, São Paulo, Brazil
| | | | - Phablo Abreu
- Department of Physiology and Biophysics, Institute of Biomedical Sciences University of São Paulo, São Paulo, Brazil
| | - Rosângela Pavan Torres
- Department of Lipids Laboratory, Food Science & Nutrition, Faculty of Pharmaceutical Science University of São Paulo, São Paulo, Brazil
| | - Jorge Mancini-Filho
- Department of Lipids Laboratory, Food Science & Nutrition, Faculty of Pharmaceutical Science University of São Paulo, São Paulo, Brazil
| | - Sandro M Hirabara
- Institute of Physical Activity Sciences and Sport, Cruzeiro do Sul University, São Paulo, Brazil
| | - Philip Newsholme
- School of Biomedical Sciences, CHIRI Biosciences Curtin University, Perth, Australia
| | - Rui Curi
- Department of Physiology and Biophysics, Institute of Biomedical Sciences University of São Paulo, São Paulo, Brazil
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342
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Influence of IV Contrast Administration on CT Measures of Muscle and Bone Attenuation: Implications for Sarcopenia and Osteoporosis Evaluation. AJR Am J Roentgenol 2016; 207:1046-1054. [PMID: 27556335 DOI: 10.2214/ajr.16.16387] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE The objective of our study was to characterize enhancement of muscle and bone that occurs on standardized four-phase contrast-enhanced CT. MATERIALS AND METHODS Two musculoskeletal radiologists reviewed standardized four-phase abdominal CT scans obtained with IV contrast material. The psoas area was measured, and the mean attenuation (in Hounsfield units) was recorded for the aorta, psoas muscles, posterior paraspinal muscles, and L4 vertebral body. CT attenuation measures were compared between anatomic regions and imaging phases with the paired t test; associations between measures were examined with the Pearson correlation coefficient (R). RESULTS The study included 201 patients (97 men, 104 women; mean age, 57.7 ± 12.5 [SD] years). Subject age was inversely correlated with unenhanced attenuation in the psoas muscles, posterior paraspinal muscles, and L4 (p < 0.001). The psoas muscles, posterior paraspinal muscles, and L4 enhanced significantly (p < 0.001) at all three contrast-enhanced phases. The greatest muscle enhancement was observed on delayed phase scans, whereas the greatest enhancement in L4 was seen on portal phase imaging. The unenhanced attenuation of the psoas muscles was significantly and negatively correlated with enhancement of the psoas muscles at the portal and delayed phases (p < 0.05 and p < 0.01, respectively), but these correlations were not seen for the posterior paraspinal muscles. Age was positively correlated with posterior paraspinal muscle enhancement at the portal and delayed phases in men (p < 0.05 and p < 0.01, respectively) but not in women. CONCLUSION Contrast enhancement of commonly measured muscle and bone regions is routinely observed and should be considered when using CT attenuation values as biomarkers of sarcopenia and osteoporosis. Furthermore, CT enhancement may be significantly influenced by age, sex, and unenhanced tissue attenuation.
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343
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Sokoloff AJ, Douglas M, Rahnert JA, Burkholder T, Easley KA, Luo Q. Absence of morphological and molecular correlates of sarcopenia in the macaque tongue muscle styloglossus. Exp Gerontol 2016; 84:40-48. [PMID: 27566374 DOI: 10.1016/j.exger.2016.08.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 08/18/2016] [Accepted: 08/22/2016] [Indexed: 01/06/2023]
Abstract
INTRODUCTION Equivocal decline of tongue muscle performance with age is compatible with resistance of the tongue to sarcopenia, the loss of muscle volume and function that typically occurs with aging. To test this possibility we characterized anatomical and molecular indices of sarcopenia in the macaque tongue muscle styloglossus (SG). METHODS We quantified myosin heavy chain (MHC), muscle fiber MHC phenotype and size and total and phosphorylated growth- and atrophy-related proteins by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), immunoblot and immunohistochemistry (IHC) in the SG in twenty-four macaque monkeys (Macaca rhesus, age range 9months to 31years) categorized into Young (<8years of age), Middle-aged (15-21years of age) and Old (>22years of age) groups. RESULTS In Young, Middle and Old age groups, by SDS-PAGE MHCI comprised ~1/3 and MHCII ~2/3 of total MHC. MHCI relative frequency was lower and MHCII higher in Middle versus Young (p=0.0099) and Middle versus Old (p=0.052). Relative frequencies of MHC fiber phenotype were not different by age but were different by phenotype (rates 233, 641 and 111 per 1000 fibers for MHCI, MHCII and MHCI-II respectively, p=0.03). Few or no fibers were positive for developmental MHC. Mean cross-sectional area (CSA) was not different among the three age groups for MHCII and MHCI-II; however MHCI fibers tended to be larger in Middle versus Old and Young (mean=2257μm2,1917μm2 (p=0.05) and 1704μm2 (p=0.06), respectively). For each age group, mean CSA increased across MHC phenotype (lowest mean CSA for MHCI and highest mean CSA for MHCII). Spearman analysis demonstrated age-related increases in total p70 ribosomal protein S6 kinase (P70), phosphorylated P70421/424, phosphorylated P38 mitogen-activated protein kinase and muscle atrophy F-Box, a trend to age-related decrease in total extracellular signal-regulated kinase (ERK), and no age-related change in total protein kinase B (Akt/PKB), phosphorylated Akt, phosphorylated ERK, phosphorylated c-Jun N-terminal kinase (JNK46) and phosphorylated P70389. CONCLUSION Common anatomical and molecular indices of sarcopenia are absent in our sample of macaque SG. Relative frequencies of MHCII protein and phenotype are preserved with age. Although MAFbx expression increases with age, this is not associated with fiber atrophy, perhaps reflecting compensatory growth signaling by p70. The resistant nature of the styloglossus muscle to sarcopenia may be related to routine activation of tongue muscles in respiration and swallowing and the preservation of hypoglossal motoneuron number with age.
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Affiliation(s)
- Alan J Sokoloff
- Department of Physiology, Emory University School of Medicine, Atlanta, GA, United States.
| | - Megan Douglas
- Department of Physiology, Emory University School of Medicine, Atlanta, GA, United States
| | - Jill A Rahnert
- School of Applied Physiology, Georgia Institute of Technology, Atlanta, GA, United States
| | - Thomas Burkholder
- School of Applied Physiology, Georgia Institute of Technology, Atlanta, GA, United States
| | - Kirk A Easley
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, GA, United States
| | - Qingwei Luo
- Department of Physiology, Emory University School of Medicine, Atlanta, GA, United States
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Influence of Botulinumtoxin A on the Expression of Adult MyHC Isoforms in the Masticatory Muscles in Dystrophin-Deficient Mice (Mdx-Mice). BIOMED RESEARCH INTERNATIONAL 2016; 2016:7063093. [PMID: 27689088 PMCID: PMC5023834 DOI: 10.1155/2016/7063093] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 06/27/2016] [Accepted: 07/10/2016] [Indexed: 11/17/2022]
Abstract
The most widespread animal model to investigate Duchenne muscular dystrophy is the mdx-mouse. In contrast to humans, phases of muscle degeneration are replaced by regeneration processes; hence there is only a restricted time slot for research. The aim of the study was to investigate if an intramuscular injection of BTX-A is able to break down muscle regeneration and has direct implications on the gene expression of myosin heavy chains in the corresponding treated and untreated muscles. Therefore, paralysis of the right masseter muscle was induced in adult healthy and dystrophic mice by a specific intramuscular injection of BTX-A. After 21 days the mRNA expression and protein content of MyHC isoforms of the right and left masseter, temporal, and the tongue muscle were determined using quantitative RT-PCR and Western blot technique. MyHC-IIa and MyHC-I-mRNA expression significantly increased in the paralyzed masseter muscle of control-mice, whereas MyHC-IIb and MyHC-IIx/d-mRNA were decreased. In dystrophic muscles no effect of BTX-A could be detected at the level of MyHC. This study suggests that BTX-A injection is a suitable method to simulate DMD-pathogenesis in healthy mice but further investigations are necessary to fully analyse the BTX-A effect and to generate sustained muscular atrophy in mdx-mice.
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345
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Gregorich ZR, Peng Y, Cai W, Jin Y, Wei L, Chen AJ, McKiernan SH, Aiken JM, Moss RL, Diffee GM, Ge Y. Top-Down Targeted Proteomics Reveals Decrease in Myosin Regulatory Light-Chain Phosphorylation That Contributes to Sarcopenic Muscle Dysfunction. J Proteome Res 2016; 15:2706-16. [PMID: 27362462 PMCID: PMC4975644 DOI: 10.1021/acs.jproteome.6b00244] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Sarcopenia, the loss of skeletal muscle mass and function with advancing age, is a significant cause of disability and loss of independence in the elderly and thus, represents a formidable challenge for the aging population. Nevertheless, the molecular mechanism(s) underlying sarcopenia-associated muscle dysfunction remain poorly understood. In this study, we employed an integrated approach combining top-down targeted proteomics with mechanical measurements to dissect the molecular mechanism(s) in age-related muscle dysfunction. Top-down targeted proteomic analysis uncovered a progressive age-related decline in the phosphorylation of myosin regulatory light chain (RLC), a critical protein involved in the modulation of muscle contractility, in the skeletal muscle of aging rats. Top-down tandem mass spectrometry analysis identified a previously unreported bis-phosphorylated proteoform of fast skeletal RLC and localized the sites of decreasing phosphorylation to Ser14/15. Of these sites, Ser14 phosphorylation represents a previously unidentified site of phosphorylation in RLC from fast-twitch skeletal muscle. Subsequent mechanical analysis of single fast-twitch fibers isolated from the muscles of rats of different ages revealed that the observed decline in RLC phosphorylation can account for age-related decreases in the contractile properties of sarcopenic fast-twitch muscles. These results strongly support a role for decreasing RLC phosphorylation in sarcopenia-associated muscle dysfunction and suggest that therapeutic modulation of RLC phosphorylation may represent a new avenue for the treatment of sarcopenia.
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Affiliation(s)
- Zachery R. Gregorich
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
- Molecular and Cellular Pharmacology Training Program, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
| | - Ying Peng
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
| | - Wenxuan Cai
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
- Molecular and Cellular Pharmacology Training Program, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
| | - Yutong Jin
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI, 53706
| | - Liming Wei
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
- Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, P. R. China
| | - Albert J. Chen
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
| | - Susan H. McKiernan
- Department of Kinesiology, University of Wisconsin-Madison, 2000 Observatory Dr., Madison, WI, 53705
| | - Judd M. Aiken
- Departments of Agriculture, Food, and Nutritional Sciences, University of Alberta-Edmonton, Edmonton, AB, Canada
| | - Richard L. Moss
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
- Human Proteomics Program, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
- UW Cardiovascular Research Center, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
| | - Gary M. Diffee
- Department of Kinesiology, University of Wisconsin-Madison, 2000 Observatory Dr., Madison, WI, 53705
- UW Cardiovascular Research Center, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
| | - Ying Ge
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
- Molecular and Cellular Pharmacology Training Program, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI, 53706
- Human Proteomics Program, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
- UW Cardiovascular Research Center, University of Wisconsin-Madison, 1111 Highland Ave., Madison, WI, 53705
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346
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Dowling P, Murphy S, Ohlendieck K. Proteomic profiling of muscle fibre type shifting in neuromuscular diseases. Expert Rev Proteomics 2016; 13:783-99. [DOI: 10.1080/14789450.2016.1209416] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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347
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Mizunoya W, Okamoto S, Miyahara H, Akahoshi M, Suzuki T, Do MKQ, Ohtsubo H, Komiya Y, Qahar M, Waga T, Nakazato K, Ikeuchi Y, Anderson JE, Tatsumi R. Fast-to-slow shift of muscle fiber-type composition by dietary apple polyphenols in rats: Impact of the low-dose supplementation. Anim Sci J 2016; 88:489-499. [PMID: 27417667 DOI: 10.1111/asj.12655] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 03/27/2016] [Accepted: 04/07/2016] [Indexed: 11/30/2022]
Abstract
Our previous studies demonstrated that an 8-week intake of 5% (w/w) apple polyphenol (APP) in the diet improves muscle endurance of young-adult rats. In order to identify a lower limit of the dietary contribution of APP to the effect, the experiments were designed for lower-dose supplementation (8-week feeding of 0.5% APP in AIN-93G diet) to 12-week-old male Sprague-Dawley rats. Results clearly showed that the 0.5% APP diet significantly up-regulates slower myosin-heavy-chain (MyHC) isoform ratios (IIx and IIa relative to total MyHC) and myoglobin expression in lower hind-limb muscles examined (P < 0.05). There was a trend to increased fatigue resistance detected from measurements of relative isometric plantar-flexion force torque generated by a stimulus train delivered to the tibial nerve (F(98, 1372) = 1.246, P = 0.0574). Importantly, there was no significant difference in the animal body-phenotypes or locomotor activity shown as total moving distance in light and dark periods. Therefore, the present study encourages the notion that even low APP-intake may increase the proportions of fatigue-resistant myofibers, and has promise as a strategy for modifying performance in human sports and improving function in age-related muscle atrophy.
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Affiliation(s)
- Wataru Mizunoya
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
| | - Shinpei Okamoto
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
| | - Hideo Miyahara
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
| | - Mariko Akahoshi
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
| | - Takahiro Suzuki
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan.,Graduate School of Agriculture, Hokkaido University, Sapporo, Japan
| | - Mai-Khoi Q Do
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
| | - Hideaki Ohtsubo
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
| | - Yusuke Komiya
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
| | - Mulan Qahar
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
| | - Toshiaki Waga
- Fundamental Research Laboratory, Asahi Breweries, Ltd., Moriya, Ibaraki, Japan.,Wakodo, Ltd., Chofu, Tokyo, Japan
| | - Koichi Nakazato
- Department of Exercise Physiology, Graduate School of Health and Sport Sciences, Nippon Sport Science University, Tokyo, Japan
| | - Yoshihide Ikeuchi
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
| | - Judy E Anderson
- Department of Biological Sciences, Faculty of Science, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Ryuichi Tatsumi
- Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan
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348
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Rui Y, Pan F, Mi J. Composition of Muscle Fiber Types in Rat Rotator Cuff Muscles. Anat Rec (Hoboken) 2016; 299:1397-401. [PMID: 27314819 DOI: 10.1002/ar.23384] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 04/20/2016] [Accepted: 04/21/2016] [Indexed: 12/26/2022]
Abstract
The rat is a suitable model to study human rotator cuff pathology owing to the similarities in morphological anatomy structure. However, few studies have reported the composition muscle fiber types of rotator cuff muscles in the rat. In this study, the myosin heavy chain (MyHC) isoforms were stained by immunofluorescence to show the muscle fiber types composition and distribution in rotator cuff muscles of the rat. It was found that rotator cuff muscles in the rat were of mixed fiber type composition. The majority of rotator cuff fibers labeled positively for MyHCII. Moreover, the rat rotator cuff muscles contained hybrid fibers. So, compared with human rotator cuff muscles composed partly of slow-twitch fibers, the majority of fast-twitch fibers in rat rotator cuff muscles should be considered when the rat model study focus on the pathological process of rotator cuff muscles after injury. Gaining greater insight into muscle fiber types in rotator cuff muscles of the rat may contribute to elucidate the mechanism of pathological change in rotator cuff muscles-related diseases. Anat Rec, 299:1397-1401, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Yongjun Rui
- Department of Hand Surgery, Wuxi Number 9 People's Hospital Affiliated to Soochow University, Wuxi, Jiangsu Province 214062, the People's Republic of China.
| | | | - Jingyi Mi
- Department of Hand Surgery, Wuxi Number 9 People's Hospital Affiliated to Soochow University, Wuxi, Jiangsu Province 214062, the People's Republic of China
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349
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Li C, White SH, Warren LK, Wohlgemuth SE. Effects of aging on mitochondrial function in skeletal muscle of American American Quarter Horses. J Appl Physiol (1985) 2016; 121:299-311. [PMID: 27283918 PMCID: PMC5040552 DOI: 10.1152/japplphysiol.01077.2015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 06/08/2016] [Indexed: 02/07/2023] Open
Abstract
Skeletal muscle function, aerobic capacity, and mitochondrial (Mt) function have been found to decline with age in humans and rodents. However, not much is known about age-related changes in Mt function in equine skeletal muscle. Here, we compared fiber-type composition and Mt function in gluteus medius and triceps brachii muscle between young (age 1.8 ± 0.1 yr, n = 24) and aged (age 17-25 yr, n = 10) American Quarter Horses. The percentage of myosin heavy chain (MHC) IIX was lower in aged compared with young muscles (gluteus, P = 0.092; triceps, P = 0.012), while the percentages of MHC I (gluteus; P < 0.001) and MHC IIA (triceps; P = 0.023) were increased. Mass-specific Mt density, indicated by citrate synthase activity, was unaffected by age in gluteus, but decreased in aged triceps (P = 0.023). Cytochrome-c oxidase (COX) activity per milligram tissue and per Mt unit decreased with age in gluteus (P < 0.001 for both) and triceps (P < 0.001 and P = 0.003, respectively). Activity of 3-hydroxyacyl-CoA dehydrogenase per milligram tissue was unaffected by age, but increased per Mt unit in aged gluteus and triceps (P = 0.023 and P < 0.001, respectively). Mt respiration of permeabilized muscle fibers per milligram tissue was unaffected by age in both muscles. Main effects of age appeared when respiration was normalized to Mt content, with increases in LEAK, oxidative phosphorylation capacity, and electron transport system capacity (P = 0.038, P = 0.045, and P = 0.007, respectively), independent of muscle. In conclusion, equine skeletal muscle aging was accompanied by a shift in fiber-type composition, decrease in Mt density and COX activity, but preserved Mt respiratory function.
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Affiliation(s)
- Chengcheng Li
- Department of Animal Sciences, University of Florida, Gainesville, Florida
| | - Sarah H White
- Department of Animal Sciences, University of Florida, Gainesville, Florida
| | - Lori K Warren
- Department of Animal Sciences, University of Florida, Gainesville, Florida
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350
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Kitajima Y, Ono Y. Estrogens maintain skeletal muscle and satellite cell functions. J Endocrinol 2016; 229:267-75. [PMID: 27048232 DOI: 10.1530/joe-15-0476] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 04/05/2016] [Indexed: 12/25/2022]
Abstract
Estrogens have crucial roles in an extensive range of physiological functions regulating cellular proliferation and differentiation, development, homeostasis, and metabolism. Therefore, prolonged estrogen insufficiency influences various types of tissues expressing estrogen receptors (ERs). Although ERs are expressed in skeletal muscle and its stem cells, called satellite cells, how prolonged estrogen insufficiency affects their function remains unclear. In this study, we investigated the effect of estrogen reduction on muscle in young ovariectomized (OVX) female mice. We found that reduced estrogens resulted in muscle atrophy in a time-dependent manner. Muscle force generation was reduced in OVX mice. Interestingly, prolonged estrogen insufficiency shifted fiber types toward faster myosin heavy chain isoforms. The number of satellite cells per isolated myofiber was unchanged, while satellite cell expansion, differentiation, and self-renewal were all markedly impaired in OVX mice. Indeed, muscle regeneration was significantly compromised in OVX mice. Taken together, our results demonstrate that estrogens are essential for comprehensively maintaining muscle function with its insufficiency affecting muscle strength and regeneration in young female mice.
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Affiliation(s)
- Yuriko Kitajima
- Department of Stem Cell BiologyAtomic Bomb Disease Institute, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Yusuke Ono
- Department of Stem Cell BiologyAtomic Bomb Disease Institute, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
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