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Nguyen K, Tang J, Cho S, Ying F, Sung HK, Jahng JW, Pantopoulos K, Sweeney G. Salubrinal promotes phospho-eIF2α-dependent activation of UPR leading to autophagy-mediated attenuation of iron-induced insulin resistance. Mol Metab 2024; 83:101921. [PMID: 38527647 PMCID: PMC11027572 DOI: 10.1016/j.molmet.2024.101921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 03/04/2024] [Accepted: 03/15/2024] [Indexed: 03/27/2024] Open
Abstract
Identification of new mechanisms mediating insulin sensitivity is important to allow validation of corresponding therapeutic targets. In this study, we first used a cellular model of skeletal muscle cell iron overload and found that endoplasmic reticulum (ER) stress and insulin resistance occurred after iron treatment. Insulin sensitivity was assessed using cells engineered to express an Akt biosensor, based on nuclear FoxO localization, as well as western blotting for insulin signaling proteins. Use of salubrinal to elevate eIF2α phosphorylation and promote the unfolded protein response (UPR) attenuated iron-induced insulin resistance. Salubrinal induced autophagy flux and its beneficial effects on insulin sensitivity were not observed in autophagy-deficient cells generated by overexpressing a dominant-negative ATG5 mutant or via knockout of ATG7. This indicated the beneficial effect of salubrinal-induced UPR activation was autophagy-dependent. We translated these observations to an animal model of systemic iron overload-induced skeletal muscle insulin resistance where administration of salubrinal as pretreatment promoted eIF2α phosphorylation, enhanced autophagic flux in skeletal muscle and improved insulin responsiveness. Together, our results show that salubrinal elicited an eIF2α-autophagy axis leading to improved skeletal muscle insulin sensitivity both in vitro and in mice.
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Affiliation(s)
- Khang Nguyen
- Department of Biology, York University, Toronto, ON, Canada
| | - Jialing Tang
- Department of Biology, York University, Toronto, ON, Canada
| | - Sungji Cho
- Department of Biology, York University, Toronto, ON, Canada
| | - Fan Ying
- Department of Biology, York University, Toronto, ON, Canada
| | | | | | - Kostas Pantopoulos
- Lady Davis Institute for Medical Research, Jewish General Hospital and Department of Medicine, McGill University, Montreal, Canada
| | - Gary Sweeney
- Department of Biology, York University, Toronto, ON, Canada.
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2
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Viggars MR, Berko HE, Hesketh SJ, Wolff CA, Gutierrez-Monreal MA, Martin RA, Jennings IG, Huo Z, Esser KA. Skeletal muscle BMAL1 is necessary for transcriptional adaptation of local and peripheral tissues in response to endurance exercise training. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.10.13.562100. [PMID: 37905004 PMCID: PMC10614785 DOI: 10.1101/2023.10.13.562100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
Objectives In this investigation, we addressed the contribution of the core circadian clock factor, BMAL1, in skeletal muscle to both acute transcriptional responses to exercise and transcriptional remodelling in response to exercise training. Additionally, we adopted a systems biology approach to investigate how loss of skeletal muscle BMAL1 altered peripheral tissue homeostasis as well as exercise training adaptations in iWAT, liver, heart, and lung of male mice. Methods Combining inducible skeletal muscle specific BMAL1 knockout mice, physiological testing and standardized exercise protocols, we performed a multi-omic analysis (transcriptomics, chromatin accessibility and metabolomics) to explore loss of muscle BMAL1 on muscle and peripheral tissue responses to exercise. Results Muscle-specific BMAL1 knockout mice demonstrated a blunted transcriptional response to acute exercise, characterized by the lack of upregulation of well-established exercise responsive transcription factors including Nr4a3 and Ppargc1a. Six weeks of exercise training in muscle-specific BMAL1 knockout mice induced significantly greater and divergent transcriptomic and metabolomic changes in muscle. Surprisingly, liver, lung, inguinal white adipose and heart showed divergent exercise training transcriptomes with less than 5% of 'exercise-training' responsive genes shared for each tissue between genotypes. Conclusion Our investigation has uncovered the critical role that BMAL1 plays in skeletal muscle as a key regulator of gene expression programs for both acute exercise and training adaptations. In addition, our work has uncovered the significant impact that altered exercise response in muscle plays in the peripheral tissue adaptation to exercise training. We also note that the transcriptome adaptations to steady state training suggest that without BMAL1, skeletal muscle does not achieve the expected homeostatic program. Our work also demonstrates that if the muscle adaptations diverge to a more maladaptive state this is linked to increased inflammation across many tissues. Understanding the molecular targets and pathways contributing to health vs. maladaptive exercise adaptations will be critical for the next stage of therapeutic design for exercise mimetics.
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Affiliation(s)
- Mark R Viggars
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Myology Institute, University of Florida, Gainesville, Florida, United States
| | - Hannah E Berko
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Myology Institute, University of Florida, Gainesville, Florida, United States
| | - Stuart J Hesketh
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Myology Institute, University of Florida, Gainesville, Florida, United States
- School of Medicine, University of Central Lancashire, United Kingdom
| | - Christopher A Wolff
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Myology Institute, University of Florida, Gainesville, Florida, United States
| | - Miguel A Gutierrez-Monreal
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Myology Institute, University of Florida, Gainesville, Florida, United States
| | - Ryan A Martin
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Myology Institute, University of Florida, Gainesville, Florida, United States
| | - Isabel G Jennings
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Myology Institute, University of Florida, Gainesville, Florida, United States
| | - Zhiguang Huo
- Department of Biostatistics, University of Florida, Gainesville, Florida, United States
| | - Karyn A Esser
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Myology Institute, University of Florida, Gainesville, Florida, United States
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3
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Ryan PJ, Uranga S, Stanelle ST, Lewis MH, O'Reilly CL, Cardin JM, Deaver JW, Morton AB, Fluckey JD. The autophagy inhibitor NSC185058 suppresses mTORC1-mediated protein anabolism in cultured skeletal muscle. Sci Rep 2024; 14:8094. [PMID: 38582781 PMCID: PMC10998866 DOI: 10.1038/s41598-024-58716-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 04/02/2024] [Indexed: 04/08/2024] Open
Abstract
The mammalian target of rapamycin (mTOR), and specifically the mTOR complex 1 (mTORC1) is the central regulator of anabolism in skeletal muscle. Among the many functions of this kinase complex is the inhibition of the catabolic process of autophagy; however, less work has been done in investigating the role of autophagy in regulating mTORC1 signaling. Using an in vitro model to better understand the pathways involved, we activated mTORC1 by several different means (growth factors, leucine supplementation, or muscle contraction), alone or with the autophagy inhibitor NSC185058. We found that inhibiting autophagy with NSC185058 suppresses mTORC1 activity, preventing any increase in cellular protein anabolism. These decrements were the direct result of action on the mTORC1 kinase, which we demonstrate, for the first time, cannot function when autophagy is inhibited by NSC185058. Our results indicate that, far from being a matter of unidirectional action, the relationship between mTORC1 and the autophagic cascade is more nuanced, with autophagy serving as an mTORC1 input, and mTORC1 inhibition of autophagy as a form of homeostatic feedback to regulate anabolic signaling. Future studies of cellular metabolism will have to consider this fundamental intertwining of protein anabolism and catabolism, and how it ultimately serves to regulate muscle proteostasis.
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Affiliation(s)
- Patrick J Ryan
- Muscle Biology Laboratory, Department of Kinesiology and Sport Management, Texas A&M University, Gilchrist Building, 2929 Research Parkway, College Station, TX, 77843-4243, USA
| | - Selina Uranga
- Muscle Biology Laboratory, Department of Kinesiology and Sport Management, Texas A&M University, Gilchrist Building, 2929 Research Parkway, College Station, TX, 77843-4243, USA
| | - Sean T Stanelle
- Muscle Biology Laboratory, Department of Kinesiology and Sport Management, Texas A&M University, Gilchrist Building, 2929 Research Parkway, College Station, TX, 77843-4243, USA
| | - Megan H Lewis
- Muscle Biology Laboratory, Department of Kinesiology and Sport Management, Texas A&M University, Gilchrist Building, 2929 Research Parkway, College Station, TX, 77843-4243, USA
| | - Colleen L O'Reilly
- Muscle Biology Laboratory, Department of Kinesiology and Sport Management, Texas A&M University, Gilchrist Building, 2929 Research Parkway, College Station, TX, 77843-4243, USA
| | - Jessica M Cardin
- Muscle Biology Laboratory, Department of Kinesiology and Sport Management, Texas A&M University, Gilchrist Building, 2929 Research Parkway, College Station, TX, 77843-4243, USA
| | - J William Deaver
- Muscle Biology Laboratory, Department of Kinesiology and Sport Management, Texas A&M University, Gilchrist Building, 2929 Research Parkway, College Station, TX, 77843-4243, USA
| | - Aaron B Morton
- Soft Tissue Regeneration and Applied Biomaterials Laboratory, Texas A&M University, Gilchrist Building, 2929 Research Parkway, College Station, TX, 77843-4243, USA
| | - James D Fluckey
- Muscle Biology Laboratory, Department of Kinesiology and Sport Management, Texas A&M University, Gilchrist Building, 2929 Research Parkway, College Station, TX, 77843-4243, USA.
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4
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Botella J, Shaw CS, Bishop DJ. Autophagy and Exercise: Current Insights and Future Research Directions. Int J Sports Med 2024; 45:171-182. [PMID: 37582398 DOI: 10.1055/a-2153-9258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2023]
Abstract
Autophagy is a cellular process by which proteins and organelles are degraded inside the lysosome. Exercise is known to influence the regulation of autophagy in skeletal muscle. However, as gold standard techniques to assess autophagy flux in vivo are restricted to animal research, important gaps remain in our understanding of how exercise influences autophagy activity in humans. Using available datasets, we show how the gene expression profile of autophagy receptors and ATG8 family members differ between human and mouse skeletal muscle, providing a potential explanation for their differing exercise-induced autophagy responses. Furthermore, we provide a comprehensive view of autophagy regulation following exercise in humans by summarizing human transcriptomic and phosphoproteomic datasets that provide novel targets of potential relevance. These newly identified phosphorylation sites may provide an explanation as to why both endurance and resistance exercise lead to an exercise-induced reduction in LC3B-II, while possibly divergently regulating autophagy receptors, and, potentially, autophagy flux. We also provide recommendations to use ex vivo autophagy flux assays to better understand the influence of exercise, and other stimuli, on autophagy regulation in humans. This review provides a critical overview of the field and directs researchers towards novel research areas that will improve our understanding of autophagy regulation following exercise in humans.
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Affiliation(s)
- Javier Botella
- Metabolic Research Unit, School of Medicine and Institute for Mental and Physical Health and Clinical Translation (IMPACT), Deakin University, Waurn Ponds, Victoria, Australia
| | - Christopher S Shaw
- Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, 3216, VIC, Australia
| | - David J Bishop
- Institute for Health and Sport (iHeS), Victoria University, Melbourne, Australia
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5
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Abdalla-Silva RL, Zanetti GO, Lautherbach N, Schavinski AZ, Heck LC, Gonçalves DAP, Kettelhut IC, Navegantes LCC, Silveira WA. β 2-Adrenoceptors activation regulates muscle trophic-related genes following acute resistance exercise in mice. Front Physiol 2024; 15:1268380. [PMID: 38318197 PMCID: PMC10839027 DOI: 10.3389/fphys.2024.1268380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 01/08/2024] [Indexed: 02/07/2024] Open
Abstract
Resistance exercise (RE) training and pharmacological stimulation of β2-Adrenoceptors (β2-ARs) alone can promote muscle hypertrophy and prevent muscle atrophy. Although the activation of the sympathetic nervous system (SNS) is a well-established response during RE, the physiological contribution of the endogenous catecholamines and β2-ARs to the RE-induced changes on skeletal muscle protein metabolism remains unclear. This study investigated the effects of the β2-ARs blockade on the acute molecular responses induced by a single bout of RE in rodent skeletal muscles. Male C57BL6/J mice were subjected to a single bout of progressive RE (until exhaustion) on a vertical ladder under β2-AR blockade with ICI 118,551 (ICI; 10 mg kg-1, i. p.), or vehicle (sterile saline; 0.9%, i. p.), and the gene expression was analyzed in gastrocnemius (GAS) muscles by qPCR. We demonstrated that a single bout of RE acutely increased the circulating levels of stress-associated hormones norepinephrine (NE) and corticosterone (CORT), as well as the muscle phosphorylation levels of AMPK, p38 MAPK and CREB, immediately after the session. The acute increase in the phosphorylation levels of CREB was followed by the upregulation of CREB-target genes Sik1, Ppargc1a and Nr4a3 (a central regulator of the acute RE response), 3 h after the RE session. Conversely, β2-AR blockade reduced significantly the Sik1 and Nr4a3 mRNA levels in muscles of exercised mice. Furthermore, a single bout of RE stimulated the mRNA levels of the atrophic genes Map1lc3b and Gabarapl1 (autophagy-related genes) and Mstn (a well-known negative regulator of muscle growth). Unexpectedly, the gene expression of Igf-1 or Il-6 were not affected by RE, while the atrophic genes Murf1/Trim63 and Atrogin-1/Mafbx32 (ubiquitin-ligases) were increased only in muscles of exercised mice under β2-AR blockade. Interestingly, performing a single bout of RE under β2-AR blockade increased the mRNA levels of Mstn in muscles of exercised mice. These data suggest that β2-ARs stimulation during acute RE stimulates the hypertrophic gene Nr4a3 and prevents the overexpression of atrophic genes such as Mstn, Murf1/Trim63, and Atrogin-1/Mafbx32 in the first hours of postexercise recovery, indicating that he SNS may be physiologically important to muscle adaptations in response to resistance training.
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Affiliation(s)
- Ronaldo L. Abdalla-Silva
- Department of Biochemistry, Pharmacology and Physiology, Institute of Biological and Natural Sciences, Federal University of Triângulo Mineiro, Uberaba, Minas Gerais, Brazil
| | - Gustavo O. Zanetti
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Natalia Lautherbach
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
- Department of Biochemistry/Immunology, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
| | - Aline Zanatta Schavinski
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
| | - Lilian C. Heck
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
| | - Dawit A. P. Gonçalves
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
- Sports Training Center, School of Physical Education, Physiotherapy and Occupational Therapy, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Isis C. Kettelhut
- Department of Biochemistry/Immunology, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
| | - Luiz C. C. Navegantes
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
| | - Wilian A. Silveira
- Department of Biochemistry, Pharmacology and Physiology, Institute of Biological and Natural Sciences, Federal University of Triângulo Mineiro, Uberaba, Minas Gerais, Brazil
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6
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Guan Y, Zhang M, Lacy C, Shah S, Epstein FH, Yan Z. Endurance Exercise Training Mitigates Diastolic Dysfunction in Diabetic Mice Independent of Phosphorylation of Ulk1 at S555. Int J Mol Sci 2024; 25:633. [PMID: 38203804 PMCID: PMC10779281 DOI: 10.3390/ijms25010633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 12/13/2023] [Accepted: 12/31/2023] [Indexed: 01/12/2024] Open
Abstract
Millions of diabetic patients suffer from cardiovascular complications. One of the earliest signs of diabetic complications in the heart is diastolic dysfunction. Regular exercise is a highly effective preventive/therapeutic intervention against diastolic dysfunction in diabetes, but the underlying mechanism(s) remain poorly understood. Studies have shown that the accumulation of damaged or dysfunctional mitochondria in the myocardium is at the center of this pathology. Here, we employed a mouse model of diabetes to test the hypothesis that endurance exercise training mitigates diastolic dysfunction by promoting cardiac mitophagy (the clearance of mitochondria via autophagy) via S555 phosphorylation of Ulk1. High-fat diet (HFD) feeding and streptozotocin (STZ) injection in mice led to reduced endurance capacity, impaired diastolic function, increased myocardial oxidative stress, and compromised mitochondrial structure and function, which were all ameliorated by 6 weeks of voluntary wheel running. Using CRISPR/Cas9-mediated gene editing, we generated non-phosphorylatable Ulk1 (S555A) mutant mice and showed the requirement of p-Ulk1at S555 for exercise-induced mitophagy in the myocardium. However, diabetic Ulk1 (S555A) mice retained the benefits of exercise intervention. We conclude that endurance exercise training mitigates diabetes-induced diastolic dysfunction independent of Ulk1 phosphorylation at S555.
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Affiliation(s)
- Yuntian Guan
- Fralin Biomedical Research Institute, Center for Exercise Medicine Research at Virginia Tech Carilion, Roanoke, VA 24016, USA; (Y.G.); (C.L.)
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia, Charlottesville, VA 22903, USA
- Departments of Pharmacology, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
| | - Mei Zhang
- Fralin Biomedical Research Institute, Center for Exercise Medicine Research at Virginia Tech Carilion, Roanoke, VA 24016, USA; (Y.G.); (C.L.)
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia, Charlottesville, VA 22903, USA
- Departments of Medicine, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
| | - Christie Lacy
- Fralin Biomedical Research Institute, Center for Exercise Medicine Research at Virginia Tech Carilion, Roanoke, VA 24016, USA; (Y.G.); (C.L.)
| | - Soham Shah
- Departments of Biomedical Engineering, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA (F.H.E.)
| | - Frederick H. Epstein
- Departments of Biomedical Engineering, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA (F.H.E.)
| | - Zhen Yan
- Fralin Biomedical Research Institute, Center for Exercise Medicine Research at Virginia Tech Carilion, Roanoke, VA 24016, USA; (Y.G.); (C.L.)
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia, Charlottesville, VA 22903, USA
- Departments of Pharmacology, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
- Departments of Medicine, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
- Departments of Biomedical Engineering, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA (F.H.E.)
- Departments of Molecular Physiology and Biological Physics, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
- Department of Human Nutrition, Foods, and Exercise, College of Agriculture and Life Sciences, Virginia Tech, Blacksburg, VA 24061, USA
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7
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Brisendine MH, Nichenko AS, Bandara AB, Willoughby OS, Amiri N, Weingrad Z, Specht KS, Bond JM, Addington A, Jones RG, Murach KA, Poelzing S, Craige SM, Grange RW, Drake JC. Neuromuscular Dysfunction Precedes Cognitive Impairment in a Mouse Model of Alzheimer's Disease. FUNCTION 2023; 5:zqad066. [PMID: 38111538 PMCID: PMC10727840 DOI: 10.1093/function/zqad066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/17/2023] [Accepted: 11/26/2023] [Indexed: 12/20/2023] Open
Abstract
Alzheimer's disease (AD) develops along a continuum that spans years prior to diagnosis. Decreased muscle function and mitochondrial respiration occur years earlier in those that develop AD; however, it is unknown what causes these peripheral phenotypes in a disease of the brain. Exercise promotes muscle, mitochondria, and cognitive health and is proposed to be a potential therapeutic for AD, but no study has investigated how skeletal muscle adapts to exercise training in an AD-like context. Utilizing 5xFAD mice, an AD model that develops ad-like pathology and cognitive impairments around 6 mo of age, we examined in vivo neuromuscular function and exercise adapations (mitochondrial respiration and RNA sequencing) before the manifestation of overt cognitive impairment. We found 5xFAD mice develop neuromuscular dysfunction beginning as early as 4 mo of age, characterized by impaired nerve-stimulated muscle torque production and compound nerve action potential of the sciatic nerve. Furthermore, skeletal muscle in 5xFAD mice had altered, sex-dependent, adaptive responses (mitochondrial respiration and gene expression) to exercise training in the absence of overt cognitive impairment. Changes in peripheral systems, specifically neural communication to skeletal muscle, may be harbingers for AD and have implications for lifestyle interventions, like exercise, in AD.
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Affiliation(s)
- Matthew H Brisendine
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
| | - Anna S Nichenko
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
| | - Aloka B Bandara
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
| | - Orion S Willoughby
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
| | - Niloufar Amiri
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
| | - Zach Weingrad
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA 24061, USA
| | - Kalyn S Specht
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
| | - Jacob M Bond
- Translational Biology, Medicine, and Health Program, Virginia Tech, Roanoke, VA 24016, USA
| | - Adele Addington
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
| | - Ronald G Jones
- Department of Health, Human Performance, and Recreation, University of Arkansas, Fayetteville, AR 72701, USA
| | - Kevin A Murach
- Department of Health, Human Performance, and Recreation, University of Arkansas, Fayetteville, AR 72701, USA
| | - Steven Poelzing
- Translational Biology, Medicine, and Health Program, Virginia Tech, Roanoke, VA 24016, USA
| | - Siobhan M Craige
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
- Translational Biology, Medicine, and Health Program, Virginia Tech, Roanoke, VA 24016, USA
| | - Robert W Grange
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
| | - Joshua C Drake
- Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA 24061, USA
- Translational Biology, Medicine, and Health Program, Virginia Tech, Roanoke, VA 24016, USA
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8
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Trautman ME, Braucher LN, Elliehausen C, Zhu WG, Zelenovskiy E, Green M, Sonsalla MM, Yeh CY, Hornberger TA, Konopka AR, Lamming DW. Resistance exercise protects mice from protein-induced fat accretion. eLife 2023; 12:RP91007. [PMID: 38019262 PMCID: PMC10686620 DOI: 10.7554/elife.91007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023] Open
Abstract
Low-protein (LP) diets extend the lifespan of diverse species and are associated with improved metabolic health in both rodents and humans. Paradoxically, many athletes and bodybuilders consume high-protein (HP) diets and protein supplements, yet are both fit and metabolically healthy. Here, we examine this paradox using weight pulling, a validated progressive resistance exercise training regimen, in mice fed either an LP diet or an isocaloric HP diet. We find that despite having lower food consumption than the LP group, HP-fed mice gain significantly more fat mass than LP-fed mice when not exercising, while weight pulling protected HP-fed mice from this excess fat accretion. The HP diet augmented exercise-induced hypertrophy of the forearm flexor complex, and weight pulling ability increased more rapidly in the exercised HP-fed mice. Surprisingly, exercise did not protect from HP-induced changes in glycemic control. Our results confirm that HP diets can augment muscle hypertrophy and accelerate strength gain induced by resistance exercise without negative effects on fat mass, and also demonstrate that LP diets may be advantageous in the sedentary. Our results highlight the need to consider both dietary composition and activity, not simply calories, when taking a precision nutrition approach to health.
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Affiliation(s)
- Michaela E Trautman
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
- Nutrition and Metabolism Graduate Program, University of Wisconsin- MadisonMadisonUnited States
| | - Leah N Braucher
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
| | - Christian Elliehausen
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
- Cellular and Molecular Biology Graduate Program, University of Wisconsin-MadisonMadisonUnited States
| | - Wenyuan G Zhu
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
- Comparative Biomedical Sciences Graduate Program, University of Wisconsin-MadisonMadisonUnited States
| | - Esther Zelenovskiy
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
| | - Madelyn Green
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
| | - Michelle M Sonsalla
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
- Comparative Biomedical Sciences Graduate Program, University of Wisconsin-MadisonMadisonUnited States
| | - Chung-Yang Yeh
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
| | - Troy A Hornberger
- Comparative Biomedical Sciences Graduate Program, University of Wisconsin-MadisonMadisonUnited States
- School of Veterinary Medicine, University of Wisconsin-MadisonMadisonUnited States
| | - Adam R Konopka
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
- Cellular and Molecular Biology Graduate Program, University of Wisconsin-MadisonMadisonUnited States
| | - Dudley W Lamming
- Department of Medicine, University of Wisconsin-MadisonMadisonUnited States
- William S. Middleton Memorial Veterans HospitalMadisonUnited States
- Nutrition and Metabolism Graduate Program, University of Wisconsin- MadisonMadisonUnited States
- Cellular and Molecular Biology Graduate Program, University of Wisconsin-MadisonMadisonUnited States
- Comparative Biomedical Sciences Graduate Program, University of Wisconsin-MadisonMadisonUnited States
- University of Wisconsin Carbone Cancer CenterMadisonUnited States
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9
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Yang M, Ge H, Ji S, Li Y, Xu L, Bi Z, Bu B. TWEAK and Fn14 are overexpressed in immune-mediated necrotizing myopathy: implications for muscle damage and repair. Rheumatology (Oxford) 2023; 62:3732-3741. [PMID: 36916753 DOI: 10.1093/rheumatology/kead108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/12/2023] [Accepted: 02/27/2023] [Indexed: 03/15/2023] Open
Abstract
OBJECTIVES TNF-like weak inducer of apoptosis (TWEAK) and its sole receptor fibroblast growth factor-inducible 14 (Fn14) are involved in various inflammatory conditions. This study was performed to investigate the potential role of TWEAK/Fn14 in immune-mediated necrotizing myopathy (IMNM). METHODS Muscle biopsies from patients with IMNM (n = 37) and controls (n = 11) were collected. Human muscle cells were treated with TWEAK in vitro. Muscle biopsies and cultured muscle cells were analysed by immunostaining and quantitative PCR. Serum levels of TWEAK and Fn14 were detected by ELISA. RESULTS TWEAK and Fn14 were overexpressed in IMNM muscle biopsies. The percentage of Fn14-positive myofibers correlated with disease severity, myonecrosis, regeneration and inflammation infiltrates. Fn14-positive myofibers tended to be surrounded or invaded by CD68+ macrophages. TWEAK treatment had a harmful effect on cultured muscle cells by inducing the production of multiple chemokines and pro-inflammatory cytokines. Serum Fn14 levels were increased in patients with IMNM and correlated with muscle weakness. CONCLUSIONS TWEAK/Fn14 signalling was activated in IMNM, most likely aggravating muscle damage via amplifying inflammatory response and macrophages chemotaxis. Fn14 seems to be a biomarker for assessing disease severity in IMNM. In addition, Fn14 may also contribute to muscle injury repair.
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Affiliation(s)
- Mengge Yang
- Department of Neurology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Huizhen Ge
- Department of Neurology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Suqiong Ji
- Department of Neurology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Yue Li
- Department of Neurology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Li Xu
- Department of Neurology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Zhuajin Bi
- Department of Neurology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Bitao Bu
- Department of Neurology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
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10
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Schulman-Geltzer EB, Collins HE, Hill BG, Fulghum KL. Coordinated Metabolic Responses Facilitate Cardiac Growth in Pregnancy and Exercise. Curr Heart Fail Rep 2023; 20:441-450. [PMID: 37581772 PMCID: PMC10589193 DOI: 10.1007/s11897-023-00622-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/19/2023] [Indexed: 08/16/2023]
Abstract
PURPOSE OF REVIEW Pregnancy and exercise are systemic stressors that promote physiological growth of the heart in response to repetitive volume overload and maintenance of cardiac output. This type of remodeling is distinct from pathological hypertrophy and involves different metabolic mechanisms that facilitate growth; however, it remains unclear how metabolic changes in the heart facilitate growth and if these processes are similar in both pregnancy- and exercise-induced cardiac growth. RECENT FINDINGS The ability of the heart to metabolize a myriad of substrates balances cardiac demands for energy provision and anabolism. During pregnancy, coordination of hormonal status with cardiac reductions in glucose oxidation appears important for physiological growth. During exercise, a reduction in cardiac glucose oxidation also appears important for physiological growth, which could facilitate shuttling of glucose-derived carbons into biosynthetic pathways for growth. Understanding the metabolic underpinnings of physiological cardiac growth could provide insight to optimize cardiovascular health and prevent deleterious remodeling, such as that which occurs from postpartum cardiomyopathy and heart failure. This short review highlights the metabolic mechanisms known to facilitate pregnancy-induced and exercise-induced cardiac growth, both of which require changes in cardiac glucose metabolism for the promotion of growth. In addition, we mention important similarities and differences of physiological cardiac growth in these models as well as discuss current limitations in our understanding of metabolic changes that facilitate growth.
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Affiliation(s)
- Emily B Schulman-Geltzer
- Center for Cardiometabolic Science, Christina Lee Brown Envirome Institute, Department of Medicine, University of Louisville, Louisville, KY, USA
| | - Helen E Collins
- Center for Cardiometabolic Science, Christina Lee Brown Envirome Institute, Department of Medicine, University of Louisville, Louisville, KY, USA
| | - Bradford G Hill
- Center for Cardiometabolic Science, Christina Lee Brown Envirome Institute, Department of Medicine, University of Louisville, Louisville, KY, USA
| | - Kyle L Fulghum
- Center for Cardiometabolic Science, Christina Lee Brown Envirome Institute, Department of Medicine, University of Louisville, Louisville, KY, USA.
- Division of Molecular Medicine, Department of Medicine, University of Minnesota, Minneapolis, MN, USA.
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11
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Wang LH, Wang YY, Liu L, Gong Q. From Diabetes to Diabetic Complications: Role of Autophagy. Curr Med Sci 2023:10.1007/s11596-023-2727-4. [PMID: 37115396 DOI: 10.1007/s11596-023-2727-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 12/29/2022] [Indexed: 04/29/2023]
Abstract
Diabetes and its complications reduce quality of life and are life-limiting. At present, diabetes treatment consists of hypoglycemic agents to control blood glucose and the use of insulin-sensitizing drugs to overcome insulin resistance. In diabetes, autophagy is impaired and thus there is poor intracellular environment homeostasis. Pancreatic β-cells and insulin target tissues are protected by enhancing autophagy. Autophagy decreases β-cell apoptosis, promotes β-cell proliferation, and alleviates insulin resistance. Autophagy in diabetes is regulated by the mammalian target of rapamycin (mTOR)/adenosine 5'-monophosphate (AMP)-activated protein kinase (AMPK) pathway and others. Autophagy enhancers can likely be used as a treatment for diabetes and its complications. This review examines the evidence linking autophagy to diabetes.
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Affiliation(s)
- Lin-Hua Wang
- Clinical Molecular Immunology Center, Yangtze University, Jingzhou, 434023, China
| | - Yang-Yang Wang
- Clinical Molecular Immunology Center, Yangtze University, Jingzhou, 434023, China
| | - Lian Liu
- Department of Pharmacology, School of Basic Medicine, Health Science Center, Yangtze University, Jingzhou, 434023, China.
| | - Quan Gong
- Clinical Molecular Immunology Center, Yangtze University, Jingzhou, 434023, China.
- Department of Immunology, School of Basic Medicine, Health Science Center, Yangtze University, Jingzhou, 434023, China.
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12
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Viggars MR, Sutherland H, Lanmüller H, Schmoll M, Bijak M, Jarvis JC. Adaptation of the transcriptional response to resistance exercise over 4 weeks of daily training. FASEB J 2023; 37:e22686. [PMID: 36468768 DOI: 10.1096/fj.202201418r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 11/05/2022] [Accepted: 11/21/2022] [Indexed: 12/12/2022]
Abstract
We present the time course of change in the muscle transcriptome 1 h after the last exercise bout of a daily resistance training program lasting 2, 10, 20, or 30 days. Daily exercise in rat tibialis anterior muscles (5 sets of 10 repetitions over 20 min) induced progressive muscle growth that approached a new stable state after 30 days. The acute transcriptional response changed along with progressive adaptation of the muscle phenotype. For example, expression of type 2B myosin was silenced. Time courses recently synthesized from human exercise studies do not demonstrate so clearly the interplay between the acute exercise response and the longer-term consequences of repeated exercise. We highlight classes of transcripts and transcription factors whose expression increases during the growth phase and declines again as the muscle adapts to a new daily pattern of activity and reduces its rate of growth. Myc appears to play a central role.
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Affiliation(s)
- Mark R Viggars
- Research Institute for Sport & Exercise Sciences, Liverpool John Moores University, Liverpool, UK.,Department of Physiology and Aging, University of Florida, Gainesville, Florida, USA.,Myology Institute, University of Florida, Gainesville, Florida, USA
| | - Hazel Sutherland
- Research Institute for Sport & Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Hermann Lanmüller
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Martin Schmoll
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Manfred Bijak
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Jonathan C Jarvis
- Research Institute for Sport & Exercise Sciences, Liverpool John Moores University, Liverpool, UK
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13
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Yang C, Song Y, Li T, Chen X, Zhou J, Pan Q, Jiang W, Wang M, Jia H. Effects of Beta-Hydroxy-Beta-Methylbutyrate Supplementation on Older Adults with Sarcopenia: A Randomized, Double-Blind, Placebo-Controlled Study. J Nutr Health Aging 2023; 27:329-339. [PMID: 37248756 DOI: 10.1007/s12603-023-1911-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Accepted: 03/24/2023] [Indexed: 05/31/2023]
Abstract
OBJECTIVES Sarcopenia is recognized as a major public health concern because of its association with several adverse health events. Beta-hydroxy-beta-methylbutyrate (HMB) supplementation reportedly delays the loss of muscle mass and function; however, the effect of HMB on sarcopenia remains inconclusive. We aimed to evaluate the impact of HMB intervention on muscle strength, physical performance, body compositions, and inflammatory factors in older adults with sarcopenia. DESIGN Randomized, double-blind, placebo-controlled trial. SETTING AND PARTICIPANTS This study included subjects aged ≥60 years with sarcopenia which were assigned to the HMB group (HMBG, n=18) and the placebo group (PG, n=16). INTERVENTION The HMBG and PG were supplied with HMB and placebo products twice daily for 12 weeks, and both received resistance exercise training twice a week in 12 weeks. MEASUREMENTS Hand grip strength was selected as the primary outcome; gait speed, five-time chair stand test, body composition and inflammatory indicators were selected as the secondary outcomes. The differences in changes from baseline between the two groups were analyzed using the analysis of covariance(ANCOVA). RESULTS After the 12-week intervention, the HMBG demonstrated significantly greater improvements in handgrip strength (4.61(95%CI:2.93,6.28) kg, P<0.001), gait speed (0.11(95%CI:0.02,0.20)m/s, P=0.014), five-time chair stand test (-3.65 (95%CI:-5.72, -1.58)s, P=0.001), muscle quality (2.47(95%CI:1.15,3.80),kg.kg-1 P=0.001) and tumor necrosis factor-like weak inducer of apoptosis (-15.23(95%CI:-29.80,-0.66)pmol/mL, P=0.041) compared with the PG; no significant differences in skeletal muscle mass, skeletal muscle index, and other body composition parameters were found between the two groups. CONCLUSION In older adults with sarcopenia, HMB significantly enhance the effect of resistance exercise training on muscle strength, physical performance, muscle quality, and reduced inflammatory factors. Therefore, HMB supplementation could be an effective treatment for sarcorpenia. The trial protocol was registered at http://www.chictr.org.cn/showproj.aspx?proj=47571 as ChiCTR2000028778.
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Affiliation(s)
- C Yang
- Hong Jia, School of Public Health, Southwest Medical University, Luzhou City, Sichuan Province, China,
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14
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Loughran TP, Cohn W, Bonilla G, Anderson RT. Cancer Prevention from the Viewpoint of UVA Comprehensive Cancer Center. Cancer Prev Res (Phila) 2022; 15:OF1-OF6. [PMID: 36318178 DOI: 10.1158/1940-6207.capr-22-0365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 09/23/2022] [Accepted: 09/23/2022] [Indexed: 01/31/2023]
Abstract
Prevention is a cornerstone of the guiding mission of the University of Virginia Comprehensive Cancer Center, which is "to reduce the burden of cancer for the patients of today, through skilled, integrated, and compassionate care and to eliminate the threat of cancer for the patients of tomorrow, through research and education in an environment that promotes diversity, equity, and inclusion." We find it useful to conceptualize different opportunities for cancer prevention using NCI's Health Behaviors Research Branch's multilevel translational framework. The latter considers three intersecting continuums: cancer control-from prevention through survivorship; translation-from basic sciences to dissemination and implementation; and level of influence or impact-from genetics to policy. An advantage of this heuristic is that "prevention" is inherently defined as an inter-programmatic concept cutting across basic, clinical, and population science research rather than solely as a programmatic domain of Population Sciences. Through the UVA community outreach and engagement, we apply this multilevel framework to mitigate the social determinants of cancer risk and outcomes that drive cancer inequities in our catchment area. Below, we provide examples of our prevention research and translation along the model continuums and focus on equity.
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Affiliation(s)
- Thomas P Loughran
- University of Virginia Comprehensive Cancer Center, Charlottesville, Virginia
- Department of Medicine, Division of Hematology/Oncology, University of Virginia School of Medicine, Charlottesville, Virginia
| | - Wendy Cohn
- University of Virginia Comprehensive Cancer Center, Charlottesville, Virginia
- Department of Public Health Sciences, University of Virginia School of Medicine, Charlottesville, Virginia
| | - Gloribel Bonilla
- University of Virginia Comprehensive Cancer Center, Charlottesville, Virginia
| | - Roger T Anderson
- University of Virginia Comprehensive Cancer Center, Charlottesville, Virginia
- Department of Public Health Sciences, University of Virginia School of Medicine, Charlottesville, Virginia
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15
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Testa MTDJ, Cella PS, Marinello PC, Frajacomo FTT, Padilha CDS, Perandini PC, Moura FA, Duarte JA, Cecchini R, Guarnier FA, Deminice R. Resistance Training Attenuates Activation of STAT3 and Muscle Atrophy in Tumor-Bearing Mice. Front Oncol 2022; 12:880787. [PMID: 35847939 PMCID: PMC9283857 DOI: 10.3389/fonc.2022.880787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 06/06/2022] [Indexed: 11/16/2022] Open
Abstract
Purpose Although the role of signal transducers and activators of transcription (STAT3) in cachexia due to the association of circulating IL-6 and muscle wasting has been extensively demonstrated, the effect of resistance training on STAT3 in mediating muscle atrophy in tumor-bearing mice is unknown. The aim of this study is to investigate the effects of resistance exercise training on inflammatory cytokines and oxidative-mediated STAT3 activation and muscle loss prevention in tumor-bearing mice. Methods Male Swiss mice were inoculated with Ehrlich tumor cells and exposed or not exposed to resistance exercise protocol of ladder climbing. Skeletal muscle STAT3 protein content was measured, compared between groups, and tested for possible association with plasma interleukins and local oxidative stress markers. Components of the ubiquitin-proteasome and autophagy pathways were assessed by real-time PCR or immunoblotting. Results Resistance training prevented STAT3 excessive activation in skeletal muscle mediated by the overabundance of plasma IL-6 and muscle oxidative stress. These mechanisms contributed to preventing the increased key genes and proteins of ubiquitin-proteasome and autophagy pathways in tumor-bearing mice, such as Atrogin-1, LC3B-II, and Beclin-1. Beyond preventing muscle atrophy, RT also prevented strength loss and impaired locomotor capacity, hallmarks of sarcopenia. Conclusion Our results suggest that STAT3 inhibition is central in resistance exercise protective effects against cancer-induced muscle atrophy and strength loss.
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Affiliation(s)
| | - Paola Sanches Cella
- Department of Physical Education, State University of Londrina, Londrina, Brazil
| | - Poliana Camila Marinello
- Department of Physical Education, State University of Londrina, Londrina, Brazil
- Department of General Pathology, State University of Londrina, Londrina, Brazil
| | | | - Camila de Souza Padilha
- Department of Physical Education, State University of Londrina, Londrina, Brazil
- Department of Physical Education, State University of São Paulo (UNESP), Presidente Prudente, Brazil
| | | | - Felipe Arruda Moura
- Department of Physical Education, State University of Londrina, Londrina, Brazil
| | | | - Rubens Cecchini
- Department of General Pathology, State University of Londrina, Londrina, Brazil
| | | | - Rafael Deminice
- Department of Physical Education, State University of Londrina, Londrina, Brazil
- *Correspondence: Rafael Deminice, ; orcid.org/0000-0002-9246-1079
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16
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Dungan CM, Brightwell CR, Wen Y, Zdunek CJ, Latham CM, Thomas NT, Zagzoog AM, Brightwell BD, Nolt GL, Keeble AR, Watowich SJ, Murach KA, Fry CS. Muscle-Specific Cellular and Molecular Adaptations to Late-Life Voluntary Concurrent Exercise. FUNCTION 2022; 3:zqac027. [PMID: 35774589 PMCID: PMC9233305 DOI: 10.1093/function/zqac027] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 05/06/2022] [Accepted: 05/08/2022] [Indexed: 01/07/2023] Open
Abstract
Murine exercise models can provide information on factors that influence muscle adaptability with aging, but few translatable solutions exist. Progressive weighted wheel running (PoWeR) is a simple, voluntary, low-cost, high-volume endurance/resistance exercise approach for training young mice. In the current investigation, aged mice (22-mo-old) underwent a modified version of PoWeR for 8 wk. Muscle functional, cellular, biochemical, transcriptional, and myonuclear DNA methylation analyses provide an encompassing picture of how muscle from aged mice responds to high-volume combined training. Mice run 6-8 km/d, and relative to sedentary mice, PoWeR increases plantarflexor muscle strength. The oxidative soleus of aged mice responds to PoWeR similarly to young mice in every parameter measured in previous work; this includes muscle mass, glycolytic-to-oxidative fiber type transitioning, fiber size, satellite cell frequency, and myonuclear number. The oxidative/glycolytic plantaris adapts according to fiber type, but with modest overall changes in muscle mass. Capillarity increases markedly with PoWeR in both muscles, which may be permissive for adaptability in advanced age. Comparison to published PoWeR RNA-sequencing data in young mice identified conserved regulators of adaptability across age and muscles; this includes Aldh1l1 which associates with muscle vasculature. Agrn and Samd1 gene expression is upregulated after PoWeR simultaneous with a hypomethylated promoter CpG in myonuclear DNA, which could have implications for innervation and capillarization. A promoter CpG in Rbm10 is hypomethylated by late-life exercise in myonuclei, consistent with findings in muscle tissue. PoWeR and the data herein are a resource for uncovering cellular and molecular regulators of muscle adaptation with aging.
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Affiliation(s)
- Cory M Dungan
- Department of Physical Therapy, University of Kentucky, Lexington 40536, KY, USA
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
| | - Camille R Brightwell
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington 40536, KY, USA
| | - Yuan Wen
- Department of Physical Therapy, University of Kentucky, Lexington 40536, KY, USA
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
| | | | - Christine M Latham
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington 40536, KY, USA
| | - Nicholas T Thomas
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington 40536, KY, USA
| | - Alyaa M Zagzoog
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington 40536, KY, USA
| | - Benjamin D Brightwell
- Kinesiology and Health Promotion Graduate Program, University of Kentucky, Lexington 40536, KY, USA
| | - Georgia L Nolt
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
| | - Alexander R Keeble
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington 40536, KY, USA
| | - Stanley J Watowich
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston 77555, TX, USA
| | - Kevin A Murach
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
- Department of Health, Human Performance, and Recreation, University of Arkansas, Fayetteville 72701, AR, USA
- Cell and Molecular Biology Program, University of Arkansas, Fayetteville 72701, AR, USA
| | - Christopher S Fry
- Center for Muscle Biology, University of Kentucky, Lexington 40536, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington 40536, KY, USA
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17
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Exercise Counteracts the Deleterious Effects of Cancer Cachexia. Cancers (Basel) 2022; 14:cancers14102512. [PMID: 35626116 PMCID: PMC9139714 DOI: 10.3390/cancers14102512] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Revised: 05/12/2022] [Accepted: 05/17/2022] [Indexed: 02/04/2023] Open
Abstract
Simple Summary This review provides an overview of the effects of exercise training on the major mechanisms related to cancer cachexia (CC). The review also discusses how cancer comorbidities can influence the ability of patients/animals with cancer to perform exercise training and what precautions should be taken when they exercise. The contribution of other factors, such as exercise modality and biological sex, to exercise effectiveness in ameliorating CC are also elaborated in the final sections. We provide meticulous evidence for how advantageous exercise training can be in patients/animals with CC at molecular and cellular levels. Finally, we emphasise what factors should be considered to optimise and personalise an exercise training program in CC. Abstract Cancer cachexia (CC) is a multifactorial syndrome characterised by unintentional loss of body weight and muscle mass in patients with cancer. The major hallmarks associated with CC development and progression include imbalanced protein turnover, inflammatory signalling, mitochondrial dysfunction and satellite cell dysregulation. So far, there is no effective treatment to counteract muscle wasting in patients with CC. Exercise training has been proposed as a potential therapeutic approach for CC. This review provides an overview of the effects of exercise training in CC-related mechanisms as well as how factors such as cancer comorbidities, exercise modality and biological sex can influence exercise effectiveness in CC. Evidence in mice and humans suggests exercise training combats all of the hallmarks of CC. Several exercise modalities induce beneficial adaptations in patients/animals with CC, but concurrent resistance and endurance training is considered the optimal type of exercise. In the case of cancer patients presenting comorbidities, exercise training should be performed only under specific guidelines and precautions to avoid adverse effects. Observational comparison of studies in CC using different biological sex shows exercise-induced adaptations are similar between male and female patients/animals with cancer, but further studies are needed to confirm this.
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18
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Drake JC, Wilson RJ, Cui D, Guan Y, Kundu M, Zhang M, Yan Z. Ulk1, Not Ulk2, Is Required for Exercise Training-Induced Improvement of Insulin Response in Skeletal Muscle. Front Physiol 2021; 12:732308. [PMID: 34658916 PMCID: PMC8514673 DOI: 10.3389/fphys.2021.732308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 08/26/2021] [Indexed: 11/13/2022] Open
Abstract
Unc51 like autophagy activating kinase 1 (Ulk1), the primary autophagy regulator, has been linked to metabolic adaptation in skeletal muscle to exercise training. Here we compared the roles of Ulk1 and homologous Ulk2 in skeletal muscle insulin action following exercise training to gain more mechanistic insights. Inducible, skeletal muscle-specific Ulk1 knock-out (Ulk1-iMKO) mice and global Ulk2 knock-out (Ulk2–/–) mice were subjected to voluntary wheel running for 6 weeks followed by assessment of exercise capacity, glucose tolerance, and insulin signaling in skeletal muscle after a bolus injection of insulin. Both Ulk1-iMKO and Ulk2–/– mice had improved endurance exercise capacity post-exercise. Ulk1-iMKO did not improve glucose clearance during glucose tolerance test, while Ulk2–/– had only marginal improvement. However, exercise training-induced improvement of insulin action in skeletal muscle, indicated by Akt-S473 phosphorylation, was only impaired in Ulk1-iMKO. These data suggest that Ulk1, but not Ulk2, is required for exercise training-induced improvement of insulin action in skeletal muscle, implicating crosstalk between catabolic and anabolic signaling as integral to metabolic adaptation to energetic stress.
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Affiliation(s)
- Joshua C Drake
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States.,Center for Skeletal Muscle Research, The Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Rebecca J Wilson
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, United States.,Department of Biochemistry, University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Di Cui
- Center for Skeletal Muscle Research, The Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Yuntian Guan
- Center for Skeletal Muscle Research, The Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States.,Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Mondira Kundu
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Mei Zhang
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States.,Center for Skeletal Muscle Research, The Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Zhen Yan
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States.,Center for Skeletal Muscle Research, The Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, United States.,Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, United States.,Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, VA, United States
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19
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Zhu WG, Hibbert JE, Lin KH, Steinert ND, Lemens JL, Jorgenson KW, Newman SM, Lamming DW, Hornberger TA. Weight Pulling: A Novel Mouse Model of Human Progressive Resistance Exercise. Cells 2021; 10:cells10092459. [PMID: 34572107 PMCID: PMC8465477 DOI: 10.3390/cells10092459] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 09/15/2021] [Accepted: 09/16/2021] [Indexed: 12/16/2022] Open
Abstract
This study describes a mouse model of progressive resistance exercise that utilizes a full-body/multi-joint exercise (weight pulling) along with a training protocol that mimics a traditional human paradigm (three training sessions per week, ~8–12 repetitions per set, 2 min of rest between sets, approximately two maximal-intensity sets per session, last set taken to failure, and a progressive increase in loading that is based on the individual’s performance). We demonstrate that weight pulling can induce an increase in the mass of numerous muscles throughout the body. The relative increase in muscle mass is similar to what has been observed in human studies, and is associated with the same type of long-term adaptations that occur in humans (e.g., fiber hypertrophy, myonuclear accretion, and, in some instances, a fast-to-slow transition in Type II fiber composition). Moreover, we demonstrate that weight pulling can induce the same type of acute responses that are thought to drive these long-term adaptations (e.g., the activation of signaling through mTORC1 and the induction of protein synthesis at 1 h post-exercise). Collectively, the results of this study indicate that weight pulling can serve as a highly translatable mouse model of progressive resistance exercise.
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Affiliation(s)
- Wenyuan G. Zhu
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Jamie E. Hibbert
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Kuan Hung Lin
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Nathaniel D. Steinert
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Jake L. Lemens
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Kent W. Jorgenson
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Sarah M. Newman
- Department of Medicine, University of Wisconsin-Madison, Madison, WI 53705, USA; (S.M.N.); (D.W.L.)
- William S. Middleton Memorial Veterans Hospital, Madison, WI 53705, USA
| | - Dudley W. Lamming
- Department of Medicine, University of Wisconsin-Madison, Madison, WI 53705, USA; (S.M.N.); (D.W.L.)
- William S. Middleton Memorial Veterans Hospital, Madison, WI 53705, USA
| | - Troy A. Hornberger
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
- Correspondence:
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20
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Naimo MA, Varanoske AN, Hughes JM, Pasiakos SM. Skeletal Muscle Quality: A Biomarker for Assessing Physical Performance Capabilities in Young Populations. Front Physiol 2021; 12:706699. [PMID: 34421645 PMCID: PMC8376973 DOI: 10.3389/fphys.2021.706699] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 07/09/2021] [Indexed: 12/28/2022] Open
Abstract
Muscle quality (MQ), defined as the amount of strength and/or power per unit of muscle mass, is a novel index of functional capacity that is increasingly relied upon as a critical biomarker of muscle health in low functioning aging and pathophysiological adult populations. Understanding the phenotypical attributes of MQ and how to use it as an assessment tool to explore the efficacy of resistance exercise training interventions that prioritize functional enhancement over increases in muscle size may have implications for populations beyond compromised adults, including healthy young adults who routinely perform physically demanding tasks for competitive or occupational purposes. However, MQ has received far less attention in healthy young populations than it has in compromised adults. Researchers and practitioners continue to rely upon static measures of lean mass or isolated measures of strength and power, rather than using MQ, to assess integrated functional responses to resistance exercise training and physical stress. Therefore, this review will critically examine MQ and the evidence base to establish this metric as a practical and important biomarker for functional capacity and performance in healthy, young populations. Interventions that enhance MQ, such as high-intensity stretch shortening contraction resistance exercise training, will be highlighted. Finally, we will explore the potential to leverage MQ as a practical assessment tool to evaluate function and enhance performance in young populations in non-traditional research settings.
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Affiliation(s)
- Marshall A Naimo
- Military Performance Division, United States Army Research Institute of Environmental Medicine, Natick, MA, United States
| | - Alyssa N Varanoske
- Military Nutrition Division, United States Army Research Institute of Environmental Medicine, Natick, MA, United States.,Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
| | - Julie M Hughes
- Military Performance Division, United States Army Research Institute of Environmental Medicine, Natick, MA, United States
| | - Stefan M Pasiakos
- Military Nutrition Division, United States Army Research Institute of Environmental Medicine, Natick, MA, United States
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21
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Costa JSR, Fonseca GFAC, Ottone NCDS, Silva PA, Antonaccio RF, Silva G, Rocha MDSA, Coimbra CC, Esteves EA, Mang ZA, Amorim FT, Magalhães FDC. Strength training improves insulin resistance and differently affects mitochondria in skeletal muscle and visceral adipose tissue in high-fat fed mice. Life Sci 2021; 278:119639. [PMID: 34043987 DOI: 10.1016/j.lfs.2021.119639] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 05/13/2021] [Accepted: 05/14/2021] [Indexed: 02/08/2023]
Abstract
AIMS Strength training (ST) improves insulin resistance and glucose tolerance by yet unknown mechanisms. The aims of this study were to investigate the effects of ST on mitochondrial adaptation in skeletal muscle and adipose tissue, on heat shock protein 72 (Hsp72) in skeletal muscle, and on visceral adipocyte size in mice with high-fat diet (HFD)-induced insulin resistance. MATERIALS AND METHODS Male Balb/c mice were divided into sedentary control-chow (C-chow), strength trained-chow (ST-chow), sedentary control-HFD (C-HFD) and strength trained-HFD (ST-HFD). Diet was provided for 12 weeks, while ladder climbing ST was performed for the final six weeks of the study at a frequency of three days per week. KEY FINDINGS Strength training led to increased strength, muscular endurance, and skeletal muscle hypertrophy. Compared to the C-HFD group, mice in the ST-HFD group decreased their whole-body insulin resistance, improved their glucose tolerance, and had higher activation of the insulin pathway in skeletal muscle. ST increased citrate synthase (CS) activity in skeletal muscle, but this increase was blunted in ST-HFD. Conversely, HFD reduced adipose tissue CS activity regardless of training status. Hsp72 content was reduced in C-HFD, but returned to control levels in ST-HFD. Finally, reduced epididymal adipocyte size was observed in ST-HFD. SIGNIFICANCE These results suggest that the improvement in insulin resistance induced by ST is related to mitochondrial adaptation in skeletal muscle, but not in adipose tissue. Moreover, this improvement might be related to increased skeletal muscle Hsp72 and reduced epididymal adipocyte size.
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Affiliation(s)
- Juliana Sales Rodrigues Costa
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Graciene Fernandes Araújo Campos Fonseca
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Natielle Cecília Dos Santos Ottone
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Patrick Almeida Silva
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Romulo Fernandes Antonaccio
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Gabriela Silva
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Maíra da Silva Almeida Rocha
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Candido Celso Coimbra
- Endocrinology Laboratory, Biological Sciences Institute, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Elizabethe Adriana Esteves
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Zachary A Mang
- Department of Health, Exercise, and Sport Science, University of New Mexico, Albuquerque, NM 87131, United States of America
| | - Fabiano Trigueiro Amorim
- Department of Health, Exercise, and Sport Science, University of New Mexico, Albuquerque, NM 87131, United States of America
| | - Flávio de Castro Magalhães
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Faculdade de Ciências Básicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil.
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22
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Higashida K, Inoue S, Takeuchi N, Ato S, Ogasawara R, Nakai N. Basal and resistance exercise-induced increase in protein synthesis is impaired in skeletal muscle of iron-deficient rats. Nutrition 2021; 91-92:111389. [PMID: 34303956 DOI: 10.1016/j.nut.2021.111389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 05/14/2021] [Accepted: 06/05/2021] [Indexed: 01/07/2023]
Abstract
OBJECTIVES We aimed to investigate the effect of iron deficiency on basal- and contraction-induced increases in muscle protein synthesis. METHODS Four-wk-old male Sprague-Dawley rats were divided into three groups. The rats in two of the three groups had free access to a control diet (AD) or iron-deficient diet (ID) for 4 wk. The rats in the third group (CON) were pair-fed the control diet to the mean intake of the ID group. RESULTS In comparison with the CON group, the ID group showed significantly lower hematocrit and hemoglobin concentrations, iron-containing protein levels, and total iron content in skeletal muscle, but non-iron-containing protein levels did not show any differences between the groups. Protein synthesis, measured by puromycin-labeled peptides, was lower in the ID group compared with the CON group in both basal- and contraction-stimulated states. The ID diet impaired the activation levels of signaling pathways involved in protein synthesis, such as ribosomal protein S6 and eukaryotic translation initiation factor 4E-binding protein 1. Furthermore, dietary iron deficiency decreased autophagy capacity, but did not affect the ubiquitinated protein content. CONCLUSIONS These results suggest that severe iron deficiency decreases not only basal but also muscle contraction-induced increases in protein synthesis due to, at least in part, downregulation of the protein synthesis signaling pathway in the skeletal muscle.
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Affiliation(s)
- Kazuhiko Higashida
- Laboratory of Exercise Nutrition, Department of Nutrition, University of Shiga Prefecture, Japan.
| | - Sachika Inoue
- Laboratory of Exercise Nutrition, Department of Nutrition, University of Shiga Prefecture, Japan
| | - Nodoka Takeuchi
- Laboratory of Exercise Nutrition, Department of Nutrition, University of Shiga Prefecture, Japan
| | - Satoru Ato
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Nagoya, Japan
| | - Riki Ogasawara
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Nagoya, Japan
| | - Naoya Nakai
- Laboratory of Exercise Nutrition, Department of Nutrition, University of Shiga Prefecture, Japan
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23
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Pileggi CA, Parmar G, Harper ME. The lifecycle of skeletal muscle mitochondria in obesity. Obes Rev 2021; 22:e13164. [PMID: 33442950 DOI: 10.1111/obr.13164] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/10/2020] [Accepted: 10/12/2020] [Indexed: 12/12/2022]
Abstract
Skeletal muscle possesses dramatic metabolic plasticity that allows for the rapid adaptation in cellular energy transduction to meet the demands of the organism. Obesity elicits changes in skeletal muscle structure and function, resulting in the accumulation of intramuscular lipids. The accumulation of intramuscular lipids in obesity is associated with impaired skeletal muscle mitochondrial content and function. Mitochondria exist as a dynamic network that is regulated by the processes of biogenesis, fusion, fission, and mitophagy. In this review, we outline adaptations in molecular pathways that regulate mitochondrial structure and function in obesity. We highlight the emerging role of dysregulated skeletal muscle macroautophagy and mitochondrial turnover in obesity. Future research should further elucidate the role of mitophagy in observed reductions in mitochondrial content and function during obesity.
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Affiliation(s)
- Chantal A Pileggi
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada.,Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON, K1H 8M5, Canada
| | - Gaganvir Parmar
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada.,Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON, K1H 8M5, Canada
| | - Mary-Ellen Harper
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada.,Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON, K1H 8M5, Canada
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24
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Myostatin Inhibition-Induced Increase in Muscle Mass and Strength Was Amplified by Resistance Exercise Training, and Dietary Essential Amino Acids Improved Muscle Quality in Mice. Nutrients 2021; 13:nu13051508. [PMID: 33947024 PMCID: PMC8146053 DOI: 10.3390/nu13051508] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/23/2021] [Accepted: 04/27/2021] [Indexed: 12/16/2022] Open
Abstract
It has been frequently reported that myostatin inhibition increases muscle mass, but decreases muscle quality (i.e., strength/muscle mass). Resistance exercise training (RT) and essential amino acids (EAAs) are potent anabolic stimuli that synergistically increase muscle mass through changes in muscle protein turnover. In addition, EAAs are known to stimulate mitochondrial biogenesis. We have investigated if RT amplifies the anabolic potential of myostatin inhibition while EAAs enhance muscle quality through stimulations of mitochondrial biogenesis and/or muscle protein turnover. Mice were assigned into ACV (myostatin inhibitor), ACV+EAA, ACV+RT, ACV+EAA +RT, or control (CON) over 4 weeks. RT, but not EAA, increased muscle mass above ACV. Despite differences in muscle mass gain, myofibrillar protein synthesis was stimulated similarly in all vs. CON, suggesting a role for changes in protein breakdown in muscle mass gains. There were increases in MyoD expression but decreases in Atrogin-1/MAFbx expression in ACV+EAA, ACV+RT, and ACV+EAA+RT vs. CON. EAA increased muscle quality (e.g., grip strength and maximal carrying load) without corresponding changes in markers of mitochondrial biogenesis and neuromuscular junction stability. In conclusion, RT amplifies muscle mass and strength through changes in muscle protein turnover in conjunction with changes in implicated signaling, while EAAs enhance muscle quality through unknown mechanisms.
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25
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Targeting the Activin Receptor Signaling to Counteract the Multi-Systemic Complications of Cancer and Its Treatments. Cells 2021; 10:cells10030516. [PMID: 33671024 PMCID: PMC7997313 DOI: 10.3390/cells10030516] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 02/23/2021] [Accepted: 02/24/2021] [Indexed: 02/07/2023] Open
Abstract
Muscle wasting, i.e., cachexia, frequently occurs in cancer and associates with poor prognosis and increased morbidity and mortality. Anticancer treatments have also been shown to contribute to sustainment or exacerbation of cachexia, thus affecting quality of life and overall survival in cancer patients. Pre-clinical studies have shown that blocking activin receptor type 2 (ACVR2) or its ligands and their downstream signaling can preserve muscle mass in rodents bearing experimental cancers, as well as in chemotherapy-treated animals. In tumor-bearing mice, the prevention of skeletal and respiratory muscle wasting was also associated with improved survival. However, the definitive proof that improved survival directly results from muscle preservation following blockade of ACVR2 signaling is still lacking, especially considering that concurrent beneficial effects in organs other than skeletal muscle have also been described in the presence of cancer or following chemotherapy treatments paired with counteraction of ACVR2 signaling. Hence, here, we aim to provide an up-to-date literature review on the multifaceted anti-cachectic effects of ACVR2 blockade in preclinical models of cancer, as well as in combination with anticancer treatments.
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26
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Sangha GS, Goergen CJ, Prior SJ, Ranadive SM, Clyne AM. Preclinical techniques to investigate exercise training in vascular pathophysiology. Am J Physiol Heart Circ Physiol 2021; 320:H1566-H1600. [PMID: 33385323 PMCID: PMC8260379 DOI: 10.1152/ajpheart.00719.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Atherosclerosis is a dynamic process starting with endothelial dysfunction and inflammation and eventually leading to life-threatening arterial plaques. Exercise generally improves endothelial function in a dose-dependent manner by altering hemodynamics, specifically by increased arterial pressure, pulsatility, and shear stress. However, athletes who regularly participate in high-intensity training can develop arterial plaques, suggesting alternative mechanisms through which excessive exercise promotes vascular disease. Understanding the mechanisms that drive atherosclerosis in sedentary versus exercise states may lead to novel rehabilitative methods aimed at improving exercise compliance and physical activity. Preclinical tools, including in vitro cell assays, in vivo animal models, and in silico computational methods, broaden our capabilities to study the mechanisms through which exercise impacts atherogenesis, from molecular maladaptation to vascular remodeling. Here, we describe how preclinical research tools have and can be used to study exercise effects on atherosclerosis. We then propose how advanced bioengineering techniques can be used to address gaps in our current understanding of vascular pathophysiology, including integrating in vitro, in vivo, and in silico studies across multiple tissue systems and size scales. Improving our understanding of the antiatherogenic exercise effects will enable engaging, targeted, and individualized exercise recommendations to promote cardiovascular health rather than treating cardiovascular disease that results from a sedentary lifestyle.
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Affiliation(s)
- Gurneet S Sangha
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland
| | - Craig J Goergen
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana.,Purdue University Center for Cancer Research, Purdue University, West Lafayette, Indiana
| | - Steven J Prior
- Department of Kinesiology, University of Maryland School of Public Health, College Park, Maryland.,Baltimore Veterans Affairs Geriatric Research, Education, and Clinical Center, Baltimore, Maryland
| | - Sushant M Ranadive
- Department of Kinesiology, University of Maryland School of Public Health, College Park, Maryland
| | - Alisa M Clyne
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland
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27
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Jiang L, Shen X, Dun Y, Xie M, Fu S, Zhang W, Qiu L, Ripley-Gonzalez JW, Liu S. Exercise combined with trimetazidine improves anti-fatal stress capacity through enhancing autophagy and heat shock protein 70 of myocardium in mice. Int J Med Sci 2021; 18:1680-1686. [PMID: 33746584 PMCID: PMC7976563 DOI: 10.7150/ijms.53899] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 01/06/2021] [Indexed: 12/26/2022] Open
Abstract
Background: Anti-stress capacity is important to resist the occurrence of adverse events. To observe the effects of exercise, trimetazidine alone or combined on the anti-stress capacity of mice, and further explore its potential mechanism. Methods: Forty-four C57BL/6 male mice aged 8 weeks were randomly divided into four groups (n=11 for each group): control group (group C), exercise group (group E), trimetazidine group (group T), exercise combined with trimetazidine group (group TE). After the intervention, each group was randomly subdivided into the exhaustive exercise (EE, n=6) and the non-EE (n=5) subgroups. The mice in the EE-subgroup underwent EE. Mice were sacrificed 12 hours later after EE. The myocardial ultrastructure and autophagosomes were observed under an electron microscope. The expression of autophagy-related proteins: BNIP3, LC3-II, and P62 were analyzed and the heat shock protein 70 mRNA transcription and protein expression were also investigated. Results: Exercise or trimetazidine increased the expression of BNIP3, LC3-II, and heat shock protein 70, decreased the expression of P62 pre- and post-EE while the combination has the synergistic effect. Conclusion: Exercise and trimetazidine, alone or combined enhanced the anti-stress capacity of mice significantly. The underlying mechanism may be associated with the promotion of autography and the expression of heat shock protein 70.
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Affiliation(s)
- Lingjun Jiang
- Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R China.,Division of Sport and Rehabilitation Medicine, University Hospital Ulm, Parkstr. 11, 89075, Ulm, Germany
| | - Xuanlin Shen
- Department of Rehabilitation, The Affiliated Changshu Hospital of Xuzhou Medical University, Changshu, Jiangsu 215500, P.R China
| | - Yaoshan Dun
- Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R China
| | - Murong Xie
- Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R China
| | - Siqian Fu
- Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R China
| | - Wenliang Zhang
- Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R China
| | - Ling Qiu
- Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R China
| | - Jeffrey W Ripley-Gonzalez
- Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R China
| | - Suixin Liu
- Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R China
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28
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Murach KA, Mobley CB, Zdunek CJ, Frick KK, Jones SR, McCarthy JJ, Peterson CA, Dungan CM. Muscle memory: myonuclear accretion, maintenance, morphology, and miRNA levels with training and detraining in adult mice. J Cachexia Sarcopenia Muscle 2020; 11:1705-1722. [PMID: 32881361 PMCID: PMC7749570 DOI: 10.1002/jcsm.12617] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 08/06/2020] [Accepted: 08/10/2020] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND In the context of mass regulation, 'muscle memory' can be defined as long-lasting cellular adaptations to hypertrophic exercise training that persist during detraining-induced atrophy and may facilitate future adaptation. The cellular basis of muscle memory is not clearly defined but may be related to myonuclear number and/or epigenetic changes within muscle fibres. METHODS Utilizing progressive weighted wheel running (PoWeR), a novel murine exercise training model, we explored myonuclear dynamics and skeletal muscle miRNA levels with training and detraining utilizing immunohistochemistry, single fibre myonuclear analysis, and quantitative analysis of miRNAs. We also used a genetically inducible mouse model of fluorescent myonuclear labelling to study myonuclear adaptations early during exercise. RESULTS In the soleus, oxidative type 2a fibres were larger after 2 months of PoWeR (P = 0.02), but muscle fibre size and myonuclear number did not return to untrained levels after 6 months of detraining. Soleus type 1 fibres were not larger after PoWeR but had significantly more myonuclei, as well as central nuclei (P < 0.0001), the latter from satellite cell-derived or resident myonuclei, appearing early during training and remaining with detraining. In the gastrocnemius muscle, oxidative type 2a fibres of the deep region were larger and contained more myonuclei after PoWeR (P < 0.003), both of which returned to untrained levels after detraining. In the gastrocnemius and plantaris, two muscles where myonuclear number was comparable with untrained levels after 6 months of detraining, myonuclei were significantly elongated with detraining (P < 0.0001). In the gastrocnemius, miR-1 was lower with training and remained lower after detraining (P < 0.002). CONCLUSIONS This study found that (i) myonuclei gained during hypertrophy are lost with detraining across muscles, even in oxidative fibres; (ii) complete reversal of muscle adaptations, including myonuclear number, to untrained levels occurs within 6 months in the plantaris and gastrocnemius; (iii) the murine soleus is resistant to detraining; (iv) myonuclear accretion occurs early with wheel running and can be uncoupled from muscle fibre hypertrophy; (v) resident (non-satellite cell-derived) myonuclei can adopt a central location; (vi) myonuclei change shape with training and detraining; and (vii) miR-1 levels may reflect a memory of previous adaptation that facilitates future growth.
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Affiliation(s)
- Kevin A. Murach
- Department of Physical TherapyUniversity of KentuckyLexingtonKYUSA
- Center for Muscle BiologyUniversity of KentuckyLexingtonKYUSA
| | - C. Brooks Mobley
- Department of PhysiologyUniversity of KentuckyLexingtonKYUSA
- Center for Muscle BiologyUniversity of KentuckyLexingtonKYUSA
| | | | | | | | - John J. McCarthy
- Department of PhysiologyUniversity of KentuckyLexingtonKYUSA
- Center for Muscle BiologyUniversity of KentuckyLexingtonKYUSA
| | - Charlotte A. Peterson
- Department of Physical TherapyUniversity of KentuckyLexingtonKYUSA
- Center for Muscle BiologyUniversity of KentuckyLexingtonKYUSA
| | - Cory M. Dungan
- Department of Physical TherapyUniversity of KentuckyLexingtonKYUSA
- Center for Muscle BiologyUniversity of KentuckyLexingtonKYUSA
- Sanders‐Brown Center on AgingUniversity of KentuckyLexingtonKYUSA
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29
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Englund DA, Figueiredo VC, Dungan CM, Murach KA, Peck BD, Petrosino JM, Brightwell CR, Dupont AM, Neal AC, Fry CS, Accornero F, McCarthy JJ, Peterson CA. Satellite Cell Depletion Disrupts Transcriptional Coordination and Muscle Adaptation to Exercise. FUNCTION 2020; 2:zqaa033. [PMID: 34109314 PMCID: PMC8179974 DOI: 10.1093/function/zqaa033] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 11/17/2020] [Accepted: 11/18/2020] [Indexed: 01/06/2023] Open
Abstract
Satellite cells are required for postnatal development, skeletal muscle regeneration across the lifespan, and skeletal muscle hypertrophy prior to maturity. Our group has aimed to address whether satellite cells are required for hypertrophic growth in mature skeletal muscle. Here, we generated a comprehensive characterization and transcriptome-wide profiling of skeletal muscle during adaptation to exercise in the presence or absence of satellite cells in order to identify distinct phenotypes and gene networks influenced by satellite cell content. We administered vehicle or tamoxifen to adult Pax7-DTA mice and subjected them to progressive weighted wheel running (PoWeR). We then performed immunohistochemical analysis and whole-muscle RNA-seq of vehicle (SC+) and tamoxifen-treated (SC-) mice. Further, we performed single myonuclear RNA-seq to provide detailed information on how satellite cell fusion affects myonuclear transcription. We show that while skeletal muscle can mount a robust hypertrophic response to PoWeR in the absence of satellite cells, growth, and adaptation are ultimately blunted. Transcriptional profiling reveals several gene networks key to muscle adaptation are altered in the absence of satellite cells.
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Affiliation(s)
- Davis A Englund
- Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, KY, USA
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
| | - Vandré C Figueiredo
- Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, KY, USA
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
| | - Cory M Dungan
- Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, KY, USA
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
| | - Kevin A Murach
- Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, KY, USA
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
| | - Bailey D Peck
- Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, KY, USA
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
| | - Jennifer M Petrosino
- Department of Physiology and Cell Biology, Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA
| | - Camille R Brightwell
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington, KY, USA
| | - Alec M Dupont
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
| | - Ally C Neal
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
| | - Christopher S Fry
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington, KY, USA
| | - Federica Accornero
- Department of Physiology and Cell Biology, Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA
| | - John J McCarthy
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
- Department of Physiology, College of Medicine, University of Kentucky, Lexington, KY, USA
| | - Charlotte A Peterson
- Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, KY, USA
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
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30
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Reggiani C, Schiaffino S. Muscle hypertrophy and muscle strength: dependent or independent variables? A provocative review. Eur J Transl Myol 2020; 30:9311. [PMID: 33117512 PMCID: PMC7582410 DOI: 10.4081/ejtm.2020.9311] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 08/23/2020] [Indexed: 01/02/2023] Open
Abstract
The question whether the muscle hypertrophy induced by resistance training, hormone administration or genetic manipulation is accompanied by a proportional increase in muscle strength is still open. This review summarizes and analyses data obtained in human and rodent muscles in studies that have monitored in parallel changes in muscle size and changes in muscle force, measured in isometric contractions in vivo, in isolated muscles ex vivo (in rodents) and in single muscle fibers. Although a general positive relation exists among the two variables, a number of studies show a clear dissociation with increase of muscle size with no change or even decrease in strength and, vice versa, increase in strength without increase in size. The possible mechanisms of such dissociation, which involves neural motor control and/or cellular and molecular adaptations of muscle fibers, are briefly discussed.
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Affiliation(s)
- Carlo Reggiani
- Department of Biomedical Sciences of the University of Padova, Padova, Italy.,Science and Research Centre Koper, Institute for Kinesiology Research, Koper, Slovenia
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31
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Murach KA, McCarthy JJ, Peterson CA, Dungan CM. Making Mice Mighty: recent advances in translational models of load-induced muscle hypertrophy. J Appl Physiol (1985) 2020; 129:516-521. [PMID: 32673155 DOI: 10.1152/japplphysiol.00319.2020] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The ability to genetically manipulate mice allows for gain- and loss-of-function in vivo, making them an ideal model for elucidating mechanisms of skeletal muscle mass regulation. Combining genetic models with mechanical muscle loading enables identification of specific factors involved in the hypertrophic response as well as the ability to test the requirement of those factors for adaptation, thereby informing performance and therapeutic interventions. Until recently, approaches for inducing mechanically mediated muscle hypertrophy (i.e., resistance-training analogs) have been limited and considered "nontranslatable" to humans. This mini-review outlines recent translational advances in loading-mediated strategies for inducing muscle hypertrophy in mice, and highlights the advantages and disadvantages of each method. The skeletal muscle field is poised for new breakthroughs in understanding mechanisms regulating load-induced muscle growth given the numerous murine tools that have very recently been described.
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Affiliation(s)
- Kevin A Murach
- The Center for Muscle Biology, University of Kentucky, Lexington, Kentucky.,Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, Kentucky
| | - John J McCarthy
- The Center for Muscle Biology, University of Kentucky, Lexington, Kentucky.,Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky
| | - Charlotte A Peterson
- The Center for Muscle Biology, University of Kentucky, Lexington, Kentucky.,Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, Kentucky.,Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky
| | - Cory M Dungan
- The Center for Muscle Biology, University of Kentucky, Lexington, Kentucky.,Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, Kentucky
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32
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Fukada SI, Akimoto T, Sotiropoulos A. Role of damage and management in muscle hypertrophy: Different behaviors of muscle stem cells in regeneration and hypertrophy. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2020; 1867:118742. [PMID: 32417255 DOI: 10.1016/j.bbamcr.2020.118742] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/07/2020] [Accepted: 05/12/2020] [Indexed: 12/12/2022]
Abstract
Skeletal muscle is a dynamic tissue with two unique abilities; one is its excellent regenerative ability, due to the activity of skeletal muscle-resident stem cells named muscle satellite cells (MuSCs); and the other is the adaptation of myofiber size in response to external stimulation, intrinsic factors, or physical activity, which is known as plasticity. Low physical activity and some disease conditions lead to the reduction of myofiber size, called atrophy, whereas hypertrophy refers to the increase in myofiber size induced by high physical activity or anabolic hormones/drugs. MuSCs are essential for generating new myofibers during regeneration and the increase in new myonuclei during hypertrophy; however, there has been little investigation of the molecular mechanisms underlying MuSC activation, proliferation, and differentiation during hypertrophy compared to those of regeneration. One reason is that 'degenerative damage' to myofibers during muscle injury or upon hypertrophy (especially overloaded muscle) is believed to trigger similar activation/proliferation of MuSCs. However, evidence suggests that degenerative damage of myofibers is not necessary for MuSC activation/proliferation during hypertrophy. When considering MuSC-based therapy for atrophy, including sarcopenia, it will be indispensable to elucidate MuSC behaviors in muscles that exhibit non-degenerative damage, because degenerated myofibers are not present in the atrophied muscles. In this review, we summarize recent findings concerning the relationship between MuSCs and hypertrophy, and discuss what remains to be discovered to inform the development and application of relevant treatments for muscle atrophy.
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Affiliation(s)
- So-Ichiro Fukada
- Project for Muscle Stem Cell Biology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
| | | | - Athanassia Sotiropoulos
- Institut National de la Santé et de la Recherche Médicale U1016, Institut Cochin, Paris, France
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