1
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Coen PM, Huo Z, Tranah GJ, Barnes HN, Zhang X, Wolff CA, Wu K, Cawthon PM, Hepple RT, Toledo FGS, Evans DS, Santiago‐Fernández O, Cuervo AM, Kritchevsky SB, Newman AB, Cummings SR, Esser KA. Autophagy gene expression in skeletal muscle of older individuals is associated with physical performance, muscle volume and mitochondrial function in the study of muscle, mobility and aging (SOMMA). Aging Cell 2024; 23:e14118. [PMID: 38627910 PMCID: PMC11166359 DOI: 10.1111/acel.14118] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 01/14/2024] [Accepted: 02/02/2024] [Indexed: 04/30/2024] Open
Abstract
Autophagy is essential for proteostasis, energetic balance, and cell defense and is a key pathway in aging. Identifying associations between autophagy gene expression patterns in skeletal muscle and physical performance outcomes would further our knowledge of mechanisms related with proteostasis and healthy aging. Muscle biopsies were obtained from participants in the Study of Muscle, Mobility, and Aging (SOMMA). For 575 participants, RNA was sequenced and expression of 281 genes related to autophagy regulation, mitophagy, and mTOR/upstream pathways was determined. Associations between gene expression and outcomes including mitochondrial respiration in muscle fiber bundles (MAX OXPHOS), physical performance (VO2 peak, 400 m walking speed, and leg power), and thigh muscle volume, were determined using negative binomial regression models. For autophagy, key transcriptional regulators including TFE3 and NFKB-related genes (RELA, RELB, and NFKB1) were negatively associated with outcomes. On the contrary, regulators of oxidative metabolism that also promote overall autophagy, mitophagy, and pexophagy (PPARGC1A, PPARA, and EPAS1) were positively associated with multiple outcomes. In line with this, several mitophagy, fusion, and fission-related genes (NIPSNAP2, DNM1L, and OPA1) were also positively associated with outcomes. For mTOR pathway and related genes, expression of WDR59 and WDR24, both subunits of GATOR2 complex (an indirect inhibitor of mTORC1), and PRKAG3, which is a regulatory subunit of AMPK, were negatively correlated with multiple outcomes. Our study identifies autophagy and selective autophagy such as mitophagy gene expression patterns in human skeletal muscle related to physical performance, muscle volume, and mitochondrial function in older persons which may lead to target identification to preserve mobility and independence.
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Affiliation(s)
- Paul M. Coen
- Translational Research Institute, AdventHealthOrlandoFloridaUSA
| | - Zhiguang Huo
- Department of Biostatistics, College of Public Health & Health ProfessionsCollege of Medicine University of FloridaGainesvilleFloridaUSA
| | - Gregory J. Tranah
- California Pacific Medical Center Research InstituteSan FranciscoCaliforniaUSA
| | - Haley N. Barnes
- California Pacific Medical Center Research InstituteSan FranciscoCaliforniaUSA
| | - Xiping Zhang
- Department of Physiology and Aging, College of MedicineUniversity of FloridaGainesvilleFloridaUSA
| | - Christopher A. Wolff
- Department of Physiology and Aging, College of MedicineUniversity of FloridaGainesvilleFloridaUSA
| | - Kevin Wu
- Department of Physiology and Aging, College of MedicineUniversity of FloridaGainesvilleFloridaUSA
| | - Peggy M. Cawthon
- California Pacific Medical Center Research InstituteSan FranciscoCaliforniaUSA
- Department of Epidemiology and BiostatisticsUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Russell T. Hepple
- Department of Physical TherapyUniversity of FloridaGainesvilleFloridaUSA
| | - Frederico G. S. Toledo
- Department of Medicine, Division of Endocrinology and MetabolismUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Daniel S. Evans
- California Pacific Medical Center Research InstituteSan FranciscoCaliforniaUSA
- Department of Epidemiology and BiostatisticsUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Olaya Santiago‐Fernández
- Department of Developmental & Molecular BiologyAlbert Einstein College of MedicineNew YorkNew YorkUSA
| | - Ana Maria Cuervo
- Department of Developmental & Molecular BiologyAlbert Einstein College of MedicineNew YorkNew YorkUSA
| | - Stephen B. Kritchevsky
- Department of Internal MedicineWake Forest University School of MedicineWinston‐SalemNorth CarolinaUSA
| | - Anne B. Newman
- Department of Epidemiology, School of Public HealthUniversity of PittsburghPittsburghPennsylvaniaUSA
| | - Steven R. Cummings
- California Pacific Medical Center Research InstituteSan FranciscoCaliforniaUSA
- Department of Epidemiology and BiostatisticsUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Karyn A. Esser
- Department of Physiology and Aging, College of MedicineUniversity of FloridaGainesvilleFloridaUSA
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2
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Coen PM, Huo Z, Tranah GJ, Barnes HN, Cawthon PM, Hepple RT, Toledo FGS, Evans DS, Fernández OS, Cuervo AM, Kritchevsky SB, Newman AB, Cummings SR, Esser KA. Autophagy gene expression in skeletal muscle of older individuals is associated with physical performance, muscle volume and mitochondrial function in the Study of Muscle, Mobility and Aging (SOMMA). MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2023:2023.11.04.23297979. [PMID: 37961308 PMCID: PMC10635272 DOI: 10.1101/2023.11.04.23297979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Autophagy is an essential component of proteostasis and a key pathway in aging. Identifying associations between autophagy gene expression patterns in skeletal muscle and physical performance outcomes would further our knowledge of mechanisms related with proteostasis and healthy aging. Muscle biopsies were obtained from participants in the Study of Muscle, Mobility and Aging (SOMMA). For 575 participants, RNA was sequenced and expression of 281 genes related to autophagy regulation, mitophagy and mTOR/upstream pathways were determined. Associations between gene expression and outcomes including mitochondrial respiration in muscle fiber bundles (MAX OXPHOS), physical performance (VO2 peak, 400m walking speed, and leg power), and thigh muscle volume were determined using negative binomial regression models. For autophagy, key transcriptional regulators including TFE3 and NFKB-related genes (RELA, RELB, NFKB1) were negatively associated with outcomes. On the contrary, regulators of oxidative metabolism that also promote overall autophagy, mitophagy and pexophagy (PPARGC1A, PPARA, EPAS1) were positively associated with multiple outcomes. In line with this, several mitophagy, fusion and fission related genes (NIPSNAP2, DNM1L, OPA1) were also positively associated with outcomes. For mTOR pathway and related genes, expression of WDR59 and WDR24, both subunits of GATOR2 complex (an indirect inhibitor of mTORC1) and PRKAG3, which is a regulatory subunit of AMPK, were negatively correlated with multiple outcomes. Our study identifies autophagy and selective autophagy such as mitophagy gene expression patterns in human skeletal muscle related to physical performance, muscle volume and mitochondrial function in older persons which may lead to target identification to preserve mobility and independence.
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Affiliation(s)
- Paul M Coen
- Translational Research Institute, Advent Health, Orlando, Florida, USA
| | - Zhiguang Huo
- Department of Biostatistics, College of Public Health & Health Professions, College of Medicine University of Florida, Gainesville, Florida, USA
| | - Gregory J Tranah
- California Pacific Medical Center Research Institute, San Francisco, California, USA
| | - Haley N Barnes
- California Pacific Medical Center Research Institute, San Francisco, California, USA
| | - Peggy M Cawthon
- California Pacific Medical Center Research Institute, San Francisco, California, USA
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California, USA
| | - Russell T Hepple
- Department of Physical Therapy, University of Florida, Gainesville, Florida, USA
| | - Frederico G S Toledo
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Daniel S Evans
- California Pacific Medical Center Research Institute, San Francisco, California, USA
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California, USA
| | - Olaya Santiago Fernández
- Department of Developmental & Molecular Biology, Albert Einstein College of Medicine, New York, New York, USA
| | - Ana Maria Cuervo
- Department of Developmental & Molecular Biology, Albert Einstein College of Medicine, New York, New York, USA
| | - Steven B Kritchevsky
- Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Anne B Newman
- Department of Epidemiology, School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Steven R Cummings
- California Pacific Medical Center Research Institute, San Francisco, California, USA
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California, USA
| | - Karyn A Esser
- Department of Physiology and Ageing, College of Medicine, University of Florida, Gainesville, FL, USA
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3
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Genome Editing to Abrogate Muscle Atrophy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1396:157-176. [DOI: 10.1007/978-981-19-5642-3_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
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4
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Bolano-Diaz C, Diaz-Manera J. Therapeutic Options for the Management of Pompe Disease: Current Challenges and Clinical Evidence in Therapeutics and Clinical Risk Management. Ther Clin Risk Manag 2022; 18:1099-1115. [PMID: 36536827 PMCID: PMC9759116 DOI: 10.2147/tcrm.s334232] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 11/21/2022] [Indexed: 08/22/2023] Open
Abstract
Pompe disease is a genetic disorder produced by mutations in the GAA gene leading to absence or reduced expression of acid alpha-glucosidase, an enzyme that metabolizes the breakdown of glycogen into glucose. There are two main phenotypes, the infantile consisting of early onset severe weakness and cardiomyopathy, and the adult which is characterized by slowly progressive skeletal and respiratory muscle weakness. Enzymatic replacement therapy (ERT) has been available for Pompe disease for more than 15 years. Although the treatment has improved many aspects of the disease, such as prolonged survival through improved cardiomyopathy and acquisition of motor milestones in infants and slower progression rate in adults, ERT is far from being a cure as both infantile and adult patients continue to progress. This fact has prompted the development of improved or new enzymes and other treatments such as gene therapy or substrate reduction strategies. Here, we review the data obtained from randomized clinical trials but also from open-label studies published so far that have assessed the advantages and limitations of this therapy. Moreover, we also review the new therapeutic strategies that are under development and provide our opinion on which are the unmet needs for patients with this disease.
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Affiliation(s)
- Carla Bolano-Diaz
- The John Walton Muscular Dystrophy Research Center, Newcastle University Translational and Clinical Research Institute, Newcastle Upon Tyne, UK
| | - Jordi Diaz-Manera
- The John Walton Muscular Dystrophy Research Center, Newcastle University Translational and Clinical Research Institute, Newcastle Upon Tyne, UK
- Laboratori de Malalties Neuromusculars, Insitut de Recerca de l’Hospital de la Santa Creu i Sant Pau de Barcelona, Barcelona, Spain
- Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Barcelona, Spain
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5
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Byeon HR, Jang SY, Lee Y, Kim D, Hong MG, Lee D, Shin JH, Seo JG. New Strains of Akkermansia muciniphila and Faecalibacterium prausnitzii are Effective for Improving the Muscle Strength of Mice with Immobilization-Induced Muscular Atrophy. J Med Food 2022; 25:565-575. [PMID: 35708632 DOI: 10.1089/jmf.2021.k.0148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Muscular atrophy is a muscle disease in which muscle mass and strength decrease due to aging, injury, metabolic disorders, or chronic conditions. Proteins in muscle tissue are degraded by the ubiquitin-proteasome pathway, and atrophy accelerates this pathway. Akkermansia muciniphila and Faecalibacterium prausnitzii strains are effective agents against metabolic and inflammatory diseases in next-generation probiotic research. In this study, we evaluated the efficacy of A. muciniphila strain EB-AMDK19 and F. prausnitzii strain EB-FPDK11 in a mouse model of muscular atrophy, since atrophy inhibits energy metabolism and immune activation. After oral administration of each strain for 4 weeks, the hind legs of the mice were fixed with a plaster cast to immobilize them for a week. As a result, the administration of EB-AMDK19 and EB-FPDK11 strains improved grip strength but did not increase muscle mass. At the molecular level, A. muciniphila and F. prausnitzii treatments decreased the expression levels of ubiquitin-proteasome genes, atrogin-1, MuRF, and cathepsin L. They increased the expression level of the mitochondrial biogenesis regulatory gene, PGC-1α. The effect of the strains was confirmed by a decrease in myostatin. Furthermore, A. muciniphila and F. prausnitzii modulated the immune function by enhancing ZO-1 and inhibiting IL-6. In particular, EB-AMDK19 promoted the expression of IL-10, an anti-inflammatory cytokine. These results suggest that A. muciniphila and F. prausnitzii may have beneficial effects on muscular atrophy, verified by newly isolated EB-AMDK19 and EB-FPDK11 as potential next-generation probiotics.
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Affiliation(s)
- Hye Rim Byeon
- Efficacy Assessment Team, R&D Center, Enterobiome Inc., Siksa-dong, Ilsandong-gu, Goyang-si, Korea
| | - Seo-Yul Jang
- Efficacy Assessment Team, R&D Center, Enterobiome Inc., Siksa-dong, Ilsandong-gu, Goyang-si, Korea
| | - Yoonmi Lee
- Efficacy Assessment Team, R&D Center, Enterobiome Inc., Siksa-dong, Ilsandong-gu, Goyang-si, Korea
| | - Dohak Kim
- Strain Development Team, R&D Center, Enterobiome Inc., Siksa-dong, Ilsandong-gu, Goyang-si, Korea
| | - Moon-Gi Hong
- Strain Development Team, R&D Center, Enterobiome Inc., Siksa-dong, Ilsandong-gu, Goyang-si, Korea
| | - Dokyung Lee
- Strain Development Team, R&D Center, Enterobiome Inc., Siksa-dong, Ilsandong-gu, Goyang-si, Korea
| | - Joo-Hyun Shin
- R&D Center, Enterobiome Inc., Siksa-dong, Ilsandong-gu, Goyang-si, Korea
| | - Jae-Gu Seo
- R&D Center, Enterobiome Inc., Siksa-dong, Ilsandong-gu, Goyang-si, Korea
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6
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Yang Q, Chan P. Skeletal Muscle Metabolic Alternation Develops Sarcopenia. Aging Dis 2022; 13:801-814. [PMID: 35656108 PMCID: PMC9116905 DOI: 10.14336/ad.2021.1107] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 11/28/2021] [Indexed: 11/23/2022] Open
Abstract
Sarcopenia is a new type of senile syndrome with progressive skeletal muscle mass loss with age, accompanied by decreased muscle strength and/or muscle function. Sarcopenia poses a serious threat to the health of the elderly and increases the burden of family and society. The underlying pathophysiological mechanisms of sarcopenia are still unclear. Recent studies have shown that changes of skeletal muscle metabolism are the risk factors for sarcopenia. Furthermore, the importance of the skeletal muscle metabolic microenvironment in regulating satellite cells (SCs) is gaining significant attention. Skeletal muscle metabolism has intrinsic relationship with the regulation of skeletal muscle mass and regeneration. This review is to discuss recent findings regarding skeletal muscle metabolic alternation and the development of sarcopenia, hoping to contribute better understanding and treatment of sarcopenia.
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Affiliation(s)
- Qiumei Yang
- Department of Neurology, Geriatrics and Neurobiology, National Clinical Research Center of Geriatric Disorders, Xuanwu Hospital of Capital Medical University, Beijing, China.
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
| | - Piu Chan
- Department of Neurology, Geriatrics and Neurobiology, National Clinical Research Center of Geriatric Disorders, Xuanwu Hospital of Capital Medical University, Beijing, China.
- Clinical Center for Parkinson’s Disease, Capital Medical University, Beijing Institute of Geriatrics, Beijing, China.
- Key Laboratory for Neurodegenerative Disease of the Ministry of Education, Beijing Key Laboratory for Parkinson’s Disease, Beijing Institute of Brain Disorders, Collaborative Innovation Center for Brain Disorders, Capital Medical University, Beijing, China.
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
- Correspondence should be addressed to: Dr. Piu Chan, Department of Neurobiology, Xuanwu Hospital of Capital Medical University, 45 Changchun Road, Beijing 100053, China. .
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7
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CARM1 Regulates AMPK Signaling in Skeletal Muscle. iScience 2020; 23:101755. [PMID: 33241200 PMCID: PMC7672286 DOI: 10.1016/j.isci.2020.101755] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 09/28/2020] [Accepted: 10/28/2020] [Indexed: 01/07/2023] Open
Abstract
Coactivator-associated arginine methyltransferase 1 (CARM1) is an emerging mediator of skeletal muscle plasticity. We employed genetic, physiologic, and pharmacologic approaches to determine whether CARM1 regulates the master neuromuscular phenotypic modifier AMP-activated protein kinase (AMPK). CARM1 skeletal muscle-specific knockout (mKO) mice displayed reduced muscle mass and dysregulated autophagic and atrophic processes downstream of AMPK. We observed altered interactions between CARM1 and AMPK and its network, including forkhead box protein O1, during muscle disuse. CARM1 methylated AMPK during the early stages of muscle inactivity, whereas CARM1 mKO mitigated progression of denervation-induced atrophy and was accompanied by attenuated phosphorylation of AMPK targets such as unc-51 like autophagy-activating kinase 1Ser555. Lower acetyl-coenzyme A corboxylaseSer79 phosphorylation, as well as reduced peroxisome proliferator-activated receptor-γ coactivator-1α, was also observed in mKO animals following acute administration of the direct AMPK activator MK-8722. Our study suggests that targeting CARM1-AMPK interplay may have broad impacts on neuromuscular health and disease. Role of the arginine methyltransferase CARM1 in muscle biology remains undefined Skeletal muscle-specific removal of CARM1 alters autophagic and atrophic processes CARM1 methylates AMPK and mediates AMPK signaling during neurogenic muscle disuse Targeted pharmacological AMPK stimulation is impacted by CARM1 in skeletal muscle
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8
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Mollo N, Cicatiello R, Aurilia M, Scognamiglio R, Genesio R, Charalambous M, Paladino S, Conti A, Nitsch L, Izzo A. Targeting Mitochondrial Network Architecture in Down Syndrome and Aging. Int J Mol Sci 2020; 21:E3134. [PMID: 32365535 PMCID: PMC7247689 DOI: 10.3390/ijms21093134] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 04/26/2020] [Accepted: 04/27/2020] [Indexed: 12/12/2022] Open
Abstract
Mitochondria are organelles that mainly control energy conversion in the cell. In addition, they also participate in many relevant activities, such as the regulation of apoptosis and calcium levels, and other metabolic tasks, all closely linked to cell viability. Functionality of mitochondria appears to depend upon their network architecture that may dynamically pass from an interconnected structure with long tubular units, to a fragmented one with short separate fragments. A decline in mitochondrial quality, which presents itself as an altered structural organization and a function of mitochondria, has been observed in Down syndrome (DS), as well as in aging and in age-related pathologies. This review provides a basic overview of mitochondrial dynamics, from fission/fusion mechanisms to mitochondrial homeostasis. Molecular mechanisms determining the disruption of the mitochondrial phenotype in DS and aging are discussed. The impaired activity of the transcriptional co-activator PGC-1α/PPARGC1A and the hyperactivation of the mammalian target of rapamycin (mTOR) kinase are emerging as molecular underlying causes of these mitochondrial alterations. It is, therefore, likely that either stimulating the PGC-1α activity or inhibiting mTOR signaling could reverse mitochondrial dysfunction. Evidence is summarized suggesting that drugs targeting either these pathways or other factors affecting the mitochondrial network may represent therapeutic approaches to improve and/or prevent the effects of altered mitochondrial function. Overall, from all these studies it emerges that the implementation of such strategies may exert protective effects in DS and age-related diseases.
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Affiliation(s)
- Nunzia Mollo
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Rita Cicatiello
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Miriam Aurilia
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Roberta Scognamiglio
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Rita Genesio
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Maria Charalambous
- Institute of Experimental Endocrinology and Oncology “G. Salvatore”, National Research Council, 80131 Naples, Italy
| | - Simona Paladino
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Anna Conti
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
| | - Lucio Nitsch
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
- Institute of Experimental Endocrinology and Oncology “G. Salvatore”, National Research Council, 80131 Naples, Italy
| | - Antonella Izzo
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, 80131 Naples, Italy
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9
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Sharma B, Dabur R. Role of Pro-inflammatory Cytokines in Regulation of Skeletal Muscle Metabolism: A Systematic Review. Curr Med Chem 2020; 27:2161-2188. [DOI: 10.2174/0929867326666181129095309] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 11/15/2018] [Accepted: 11/19/2018] [Indexed: 12/18/2022]
Abstract
Background:
Metabolic pathways perturbations lead to skeletal muscular atrophy in the
cachexia and sarcopenia due to increased catabolism. Pro-inflammatory cytokines induce the catabolic
pathways that impair the muscle integrity and function. Hence, this review primarily concentrates
on the effects of pro-inflammatory cytokines in regulation of skeletal muscle metabolism.
Objective:
This review will discuss the role of pro-inflammatory cytokines in skeletal muscles during
muscle wasting conditions. Moreover, the coordination among the pro-inflammatory cytokines
and their regulated molecular signaling pathways which increase the protein degradation will be
discussed.
Results:
During normal conditions, pro-inflammatory cytokines are required to balance anabolism
and catabolism and to maintain normal myogenesis process. However, during muscle wasting their
enhanced expression leads to marked destructive metabolism in the skeletal muscles. Proinflammatory
cytokines primarily exert their effects by increasing the expression of calpains and E3
ligases as well as of Nf-κB, required for protein breakdown and local inflammation. Proinflammatory
cytokines also locally suppress the IGF-1and insulin functions, hence increase the
FoxO activation and decrease the Akt function, the central point of carbohydrates lipid and protein
metabolism.
Conclusion:
Current advancements have revealed that the muscle mass loss during skeletal muscular
atrophy is multifactorial. Despite great efforts, not even a single FDA approved drug is available
in the market. It indicates the well-organized coordination among the pro-inflammatory cytokines
that need to be further understood and explored.
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Affiliation(s)
- Bhawana Sharma
- Department of Biochemistry, Maharshi Dayanand University, Rohtak, Haryana-124001, India
| | - Rajesh Dabur
- Department of Biochemistry, Maharshi Dayanand University, Rohtak, Haryana-124001, India
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10
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Bragato C, Carra S, Blasevich F, Salerno F, Brix A, Bassi A, Beltrame M, Cotelli F, Maggi L, Mantegazza R, Mora M. Glycogen storage in a zebrafish Pompe disease model is reduced by 3-BrPA treatment. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165662. [PMID: 31917327 DOI: 10.1016/j.bbadis.2020.165662] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 12/16/2019] [Accepted: 01/02/2020] [Indexed: 12/18/2022]
Abstract
Pompe disease (PD) is an autosomal recessive muscular disorder caused by deficiency of the glycogen hydrolytic enzyme acid α-glucosidase (GAA). The enzyme replacement therapy, currently the only available therapy for PD patients, is efficacious in improving cardiomyopathy in the infantile form, but not equally effective in the late onset cases with involvement of skeletal muscle. Correction of the skeletal muscle phenotype has indeed been challenging, probably due to concomitant dysfunctional autophagy. The increasing attention to the pathogenic mechanisms of PD and the search of new therapeutic strategies prompted us to generate and characterize a novel transient PD model, using zebrafish. Our model presented increased glycogen content, markedly altered motor behavior and increased lysosome content, in addition to altered expression of the autophagy-related transcripts and proteins Beclin1, p62 and Lc3b. Furthermore, the model was used to assess the beneficial effects of 3-bromopyruvic acid (3-BrPA). Treatment with 3-BrPA induced amelioration of the model phenotypes regarding glycogen storage, motility behavior and autophagy-related transcripts and proteins. Our zebrafish PD model recapitulates most of the defects observed in human patients, proving to be a powerful translational model. Moreover, 3-BrPA unveiled to be a promising compound for treatment of conditions with glycogen accumulation.
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Affiliation(s)
- Cinzia Bragato
- PhD program in Neuroscience, University of Milano-Bicocca, Via Cadore 48, Monza 20900, Italy; Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, Milan, 20133, Italy.
| | - Silvia Carra
- Laboratory of Endocrine and Metabolic Research, IRCCS Istituto Auxologico Italiano, Piazzale Brescia 20, Milan, 20149, Italy
| | - Flavia Blasevich
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, Milan, 20133, Italy
| | - Franco Salerno
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, Milan, 20133, Italy
| | - Alessia Brix
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, Milan, 20133, Italy
| | - Andrea Bassi
- Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milan, 20133, Italy
| | - Monica Beltrame
- Department of Biosciences, Università degli Studi di Milano, Via Celoria 26, Milan, 20133, Italy
| | - Franco Cotelli
- Department of Biosciences, Università degli Studi di Milano, Via Celoria 26, Milan, 20133, Italy
| | - Lorenzo Maggi
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, Milan, 20133, Italy
| | - Renato Mantegazza
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, Milan, 20133, Italy
| | - Marina Mora
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, Milan, 20133, Italy.
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11
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Xu S, Lun Y, Frascella M, Garcia A, Soska R, Nair A, Ponery AS, Schilling A, Feng J, Tuske S, Valle MCD, Martina JA, Ralston E, Gotschall R, Valenzano KJ, Puertollano R, Do HV, Raben N, Khanna R. Improved efficacy of a next-generation ERT in murine Pompe disease. JCI Insight 2019; 4:125358. [PMID: 30843882 DOI: 10.1172/jci.insight.125358] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 01/17/2019] [Indexed: 01/14/2023] Open
Abstract
Pompe disease is a rare inherited disorder of lysosomal glycogen metabolism due to acid α-glucosidase (GAA) deficiency. Enzyme replacement therapy (ERT) using alglucosidase alfa, a recombinant human GAA (rhGAA), is the only approved treatment for Pompe disease. Although alglucosidase alfa has provided clinical benefits, its poor targeting to key disease-relevant skeletal muscles results in suboptimal efficacy. We are developing an rhGAA, ATB200 (Amicus proprietary rhGAA), with high levels of mannose-6-phosphate that are required for efficient cellular uptake and lysosomal trafficking. When administered in combination with the pharmacological chaperone AT2221 (miglustat), which stabilizes the enzyme and improves its pharmacokinetic properties, ATB200/AT2221 was substantially more potent than alglucosidase alfa in a mouse model of Pompe disease. The new investigational therapy is more effective at reversing the primary abnormality - intralysosomal glycogen accumulation - in multiple muscles. Furthermore, unlike the current standard of care, ATB200/AT2221 dramatically reduces autophagic buildup, a major secondary defect in the diseased muscles. The reversal of lysosomal and autophagic pathologies leads to improved muscle function. These data demonstrate the superiority of ATB200/AT2221 over the currently approved ERT in the murine model.
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Affiliation(s)
- Su Xu
- Amicus Therapeutics, Cranbury, New Jersey, USA
| | - Yi Lun
- Amicus Therapeutics, Cranbury, New Jersey, USA
| | | | | | | | - Anju Nair
- Amicus Therapeutics, Cranbury, New Jersey, USA
| | | | | | - Jessie Feng
- Amicus Therapeutics, Cranbury, New Jersey, USA
| | | | | | - José A Martina
- Laboratory of Protein Trafficking and Organelle Biology, Cell Biology and Physiology Center, National Heart, Lung and Blood Institute, NIH, Bethesda, Maryland, USA
| | - Evelyn Ralston
- Light Imaging Section, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, Maryland, USA
| | | | | | - Rosa Puertollano
- Laboratory of Protein Trafficking and Organelle Biology, Cell Biology and Physiology Center, National Heart, Lung and Blood Institute, NIH, Bethesda, Maryland, USA
| | - Hung V Do
- Amicus Therapeutics, Cranbury, New Jersey, USA
| | - Nina Raben
- Laboratory of Protein Trafficking and Organelle Biology, Cell Biology and Physiology Center, National Heart, Lung and Blood Institute, NIH, Bethesda, Maryland, USA
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McCall AL, Stankov SG, Cowen G, Cloutier D, Zhang Z, Yang L, Clement N, Falk DJ, Byrne BJ. Reduction of Autophagic Accumulation in Pompe Disease Mouse Model Following Gene Therapy. Curr Gene Ther 2019; 19:197-207. [PMID: 31223086 DOI: 10.2174/1566523219666190621113807] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 05/31/2019] [Accepted: 06/11/2019] [Indexed: 12/15/2022]
Abstract
BACKGROUND Pompe disease is a fatal neuromuscular disorder caused by a deficiency in acid α-glucosidase, an enzyme responsible for glycogen degradation in the lysosome. Currently, the only approved treatment for Pompe disease is enzyme replacement therapy (ERT), which increases patient survival, but does not fully correct the skeletal muscle pathology. Skeletal muscle pathology is not corrected with ERT because low cation-independent mannose-6-phosphate receptor abundance and autophagic accumulation inhibits the enzyme from reaching the lysosome. Thus, a therapy that more efficiently targets skeletal muscle pathology, such as adeno-associated virus (AAV), is needed for Pompe disease. OBJECTIVE The goal of this project was to deliver a rAAV9-coGAA vector driven by a tissue restrictive promoter will efficiently transduce skeletal muscle and correct autophagic accumulation. METHODS Thus, rAAV9-coGAA was intravenously delivered at three doses to 12-week old Gaa-/- mice. 1 month after injection, skeletal muscles were biochemically and histologically analyzed for autophagy-related markers. RESULTS At the highest dose, GAA enzyme activity and vacuolization scores achieved therapeutic levels. In addition, resolution of autophagosome (AP) accumulation was seen by immunofluorescence and western blot analysis of autophagy-related proteins. Finally, mice treated at birth demonstrated persistence of GAA expression and resolution of lysosomes and APs compared to those treated at 3 months. CONCLUSION In conclusion, a single systemic injection of rAAV9-coGAA ameliorates vacuolar accumulation and prevents autophagic dysregulation.
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Affiliation(s)
- Angela L McCall
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL, United States
| | - Sylvia G Stankov
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL, United States
| | - Gabrielle Cowen
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL, United States
| | - Denise Cloutier
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL, United States
| | - Zizhao Zhang
- Department of Biomedical Engineering, College of Engineering, University of Florida, Gainesville, FL, United States
| | - Lin Yang
- Department of Biomedical Engineering, College of Engineering, University of Florida, Gainesville, FL, United States
| | - Nathalie Clement
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL, United States
| | - Darin J Falk
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL, United States
| | - Barry J Byrne
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL, United States
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13
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Kuhn ER, Naik AR, Lewis BE, Kokotovich KM, Li M, Stemmler TL, Larsson L, Jena BP. Nanothermometry Reveals Calcium-Induced Remodeling of Myosin. NANO LETTERS 2018; 18:7021-7029. [PMID: 30346792 PMCID: PMC6818504 DOI: 10.1021/acs.nanolett.8b02989] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Ions greatly influence protein structure-function and are critical to health and disease. A 10, 000-fold higher calcium in the sarcoplasmic reticulum (SR) of muscle suggests elevated calcium levels near active calcium channels at the SR membrane and the impact of localized high calcium on the structure-function of the motor protein myosin. In the current study, combined quantum dot (QD)-based nanothermometry and circular dichroism (CD) spectroscopy enabled detection of previously unknown enthalpy changes and associated structural remodeling of myosin, impacting its function following exposure to elevated calcium. Cadmium telluride QDs adhere to myosin, function as thermal sensors, and reveal that exposure of myosin to calcium is exothermic, resulting in lowering of enthalpy, a decrease in alpha helical content measured using CD spectroscopy, and the consequent increase in motor efficiency. Isolated muscle fibers subjected to elevated levels of calcium further demonstrate fiber lengthening and decreased motility of actin filaments on myosin-functionalized substrates. Our results, in addition to providing new insights into our understanding of muscle structure-function, establish a novel approach to understand the enthalpy of protein-ion interactions and the accompanying structural changes that may occur within the protein molecule.
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Affiliation(s)
- Eric R. Kuhn
- Department of Physiology, School of Medicine, Wayne State University, Detroit, Michigan 48201, United States
| | - Akshata R. Naik
- Department of Physiology, School of Medicine, Wayne State University, Detroit, Michigan 48201, United States
| | - Brianne E. Lewis
- Department of Pharmaceutical Science, College of Pharmacy, Wayne State University, Detroit, Michigan 48201, United States
| | - Keith M. Kokotovich
- Department of Physiology, School of Medicine, Wayne State University, Detroit, Michigan 48201, United States
| | - Meishan Li
- Department of Physiology and Pharmacology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Timothy L. Stemmler
- Department of Pharmaceutical Science, College of Pharmacy, Wayne State University, Detroit, Michigan 48201, United States
| | - Lars Larsson
- Department of Physiology and Pharmacology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Bhanu P. Jena
- Department of Physiology, School of Medicine, Wayne State University, Detroit, Michigan 48201, United States
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14
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Lim JA, Sun B, Puertollano R, Raben N. Therapeutic Benefit of Autophagy Modulation in Pompe Disease. Mol Ther 2018; 26:1783-1796. [PMID: 29804932 DOI: 10.1016/j.ymthe.2018.04.025] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 04/25/2018] [Accepted: 04/30/2018] [Indexed: 12/11/2022] Open
Abstract
The complexity of the pathogenic cascade in lysosomal storage disorders suggests that combination therapy will be needed to target various aspects of pathogenesis. The standard of care for Pompe disease (glycogen storage disease type II), a deficiency of lysosomal acid alpha glucosidase, is enzyme replacement therapy (ERT). Many patients have poor outcomes due to limited efficacy of the drug in clearing muscle glycogen stores. The resistance to therapy is linked to massive autophagic buildup in the diseased muscle. We have explored two strategies to address the problem. Genetic suppression of autophagy in muscle of knockout mice resulted in the removal of autophagic buildup, increase in muscle force, decrease in glycogen level, and near-complete clearance of lysosomal glycogen following ERT. However, this approach leads to accumulation of ubiquitinated proteins, oxidative stress, and exacerbation of muscle atrophy. Another approach involves AAV-mediated TSC knockdown in knockout muscle leading to upregulation of mTOR, inhibition of autophagy, reversal of atrophy, and efficient cellular clearance on ERT. Importantly, this approach reveals the possibility of reversing already established autophagic buildup, rather than preventing its development.
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Affiliation(s)
- Jeong-A Lim
- Cell Biology and Physiology Center, National Heart, Lung, and Blood Institute, NIH, Bethesda, MD, USA; Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Baodong Sun
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Rosa Puertollano
- Cell Biology and Physiology Center, National Heart, Lung, and Blood Institute, NIH, Bethesda, MD, USA.
| | - Nina Raben
- Cell Biology and Physiology Center, National Heart, Lung, and Blood Institute, NIH, Bethesda, MD, USA.
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15
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Castets P, Frank S, Sinnreich M, Rüegg MA. "Get the Balance Right": Pathological Significance of Autophagy Perturbation in Neuromuscular Disorders. J Neuromuscul Dis 2018; 3:127-155. [PMID: 27854220 PMCID: PMC5271579 DOI: 10.3233/jnd-160153] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Recent research has revealed that autophagy, a major catabolic process in cells, is dysregulated in several neuromuscular diseases and contributes to the muscle wasting caused by non-muscle disorders (e.g. cancer cachexia) or during aging (i.e. sarcopenia). From there, the idea arose to interfere with autophagy or manipulate its regulatory signalling to help restore muscle homeostasis and attenuate disease progression. The major difficulty for the development of therapeutic strategies is to restore a balanced autophagic flux, due to the dynamic nature of autophagy. Thus, it is essential to better understand the mechanisms and identify the signalling pathways at play in the control of autophagy in skeletal muscle. A comprehensive analysis of the autophagic flux and of the causes of its dysregulation is required to assess the pathogenic role of autophagy in diseased muscle. Furthermore, it is essential that experiments distinguish between primary dysregulation of autophagy (prior to disease onset) and impairments as a consequence of the pathology. Of note, in most muscle disorders, autophagy perturbation is not caused by genetic modification of an autophagy-related protein, but rather through indirect alteration of regulatory signalling or lysosomal function. In this review, we will present the mechanisms involved in autophagy, and those ensuring its tight regulation in skeletal muscle. We will then discuss as to how autophagy dysregulation contributes to the pathogenesis of neuromuscular disorders and possible ways to interfere with this process to limit disease progression.
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Affiliation(s)
| | - Stephan Frank
- Institute of Pathology, Division of Neuropathology Basel University Hospital, Basel, Switzerland
| | - Michael Sinnreich
- Neuromuscular Research Center, Departments of Neurology and Biomedicine, Pharmazentrum, Basel, Switzerland
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16
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Sathyanarayan A, Mashek MT, Mashek DG. ATGL Promotes Autophagy/Lipophagy via SIRT1 to Control Hepatic Lipid Droplet Catabolism. Cell Rep 2017; 19:1-9. [PMID: 28380348 DOI: 10.1016/j.celrep.2017.03.026] [Citation(s) in RCA: 227] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 12/21/2016] [Accepted: 03/06/2017] [Indexed: 12/25/2022] Open
Abstract
Hepatic lipid droplet (LD) catabolism is thought to occur via cytosolic lipases such as adipose triglyceride lipase (ATGL) or through autophagy of LDs, a process known as lipophagy. We tested the potential interplay between these metabolic processes and its effects on hepatic lipid metabolism. We show that hepatic ATGL is both necessary and sufficient to induce both autophagy and lipophagy. Moreover, lipophagy is required for ATGL to promote LD catabolism and the subsequent oxidation of hydrolyzed fatty acids (FAs). Following previous work showing that ATGL promotes sirtuin 1 (SIRT1) activity, studies in liver-specific SIRT1-/- mice and in primary hepatocytes reveal that SIRT1 is required for ATGL-mediated induction of autophagy and lipophagy. Taken together, these studies show that ATGL-mediated signaling via SIRT1 promotes autophagy/lipophagy as a primary means to control hepatic LD catabolism and FA oxidation.
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Affiliation(s)
- Aishwarya Sathyanarayan
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA; Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108, USA
| | - Mara T Mashek
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Douglas G Mashek
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA; Division of Diabetes, Endocrinology and Metabolism, Department of Medicine, University of Minnesota, Minneapolis, MN 55455, USA.
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17
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Involvement of Mitochondrial Disorders in Septic Cardiomyopathy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:4076348. [PMID: 29201271 PMCID: PMC5671744 DOI: 10.1155/2017/4076348] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 09/11/2017] [Accepted: 09/28/2017] [Indexed: 12/29/2022]
Abstract
Sepsis is defined as a life-threatening organ dysfunction caused by a dysregulated host response to infection. It remains a leading cause of death worldwide, despite the development of various therapeutic strategies. Cardiac dysfunction, also referred to as septic cardiomyopathy, is a frequent and well-described complication of sepsis and associated with worse clinical outcomes. Recent research has increased our understanding of the role of mitochondrial dysfunction in the pathophysiology of septic cardiomyopathy. The purpose of this review is to present this evidence as a coherent whole and to highlight future research directions.
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18
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Lim JA, Li L, Shirihai OS, Trudeau KM, Puertollano R, Raben N. Modulation of mTOR signaling as a strategy for the treatment of Pompe disease. EMBO Mol Med 2017; 9:353-370. [PMID: 28130275 PMCID: PMC5331267 DOI: 10.15252/emmm.201606547] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Mechanistic target of rapamycin (mTOR) coordinates biosynthetic and catabolic processes in response to multiple extracellular and intracellular signals including growth factors and nutrients. This serine/threonine kinase has long been known as a critical regulator of muscle mass. The recent finding that the decision regarding its activation/inactivation takes place at the lysosome undeniably brings mTOR into the field of lysosomal storage diseases. In this study, we have examined the involvement of the mTOR pathway in the pathophysiology of a severe muscle wasting condition, Pompe disease, caused by excessive accumulation of lysosomal glycogen. Here, we report the dysregulation of mTOR signaling in the diseased muscle cells, and we focus on potential sites for therapeutic intervention. Reactivation of mTOR in the whole muscle of Pompe mice by TSC knockdown resulted in the reversal of atrophy and a striking removal of autophagic buildup. Of particular interest, we found that the aberrant mTOR signaling can be reversed by arginine. This finding can be translated into the clinic and may become a paradigm for targeted therapy in lysosomal, metabolic, and neuromuscular diseases.
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Affiliation(s)
- Jeong-A Lim
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA.,Cell Biology and Physiology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Lishu Li
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Orian S Shirihai
- Department of Medicine, Obesity and Nutrition Section, Evans Biomedical Research Center, Boston University School of Medicine, Boston, MA, USA
| | - Kyle M Trudeau
- Department of Medicine, Obesity and Nutrition Section, Evans Biomedical Research Center, Boston University School of Medicine, Boston, MA, USA
| | - Rosa Puertollano
- Cell Biology and Physiology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Nina Raben
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA
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19
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Latorre P, Varona L, Burgos C, Carrodeguas JA, López-Buesa P. O-GlcNAcylation mediates the control of cytosolic phosphoenolpyruvate carboxykinase activity via Pgc1α. PLoS One 2017; 12:e0179988. [PMID: 28644880 PMCID: PMC5482481 DOI: 10.1371/journal.pone.0179988] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 06/07/2017] [Indexed: 11/19/2022] Open
Abstract
PGC1α is a coactivator of many transcription factors and cytosolic phosphoenolpyruvate carboxykinase (PCK1) is a key enzyme for gluconeogenesis. PGC1α interacts with the transcription factor PPARγ to stimulate PCK1 expression and thus de novo glucose synthesis. These proteins are not only important for central energy metabolism but also for supplying intermediates for other metabolic pathways, including lipidogenesis and protein synthesis and might therefore be important factors in the ethiopathogenesis of metabolic disorders like diabetes but also in other pathologies like cancer. Since polymorphisms in these proteins have been related to some phenotypic traits in animals like pigs and PGC1α G482S polymorphism increases fat deposition in humans, we have investigated the molecular basis of such effects focusing on a commonly studied polymorphism in pig Pgc1α, which changes a cysteine at position 430 (WT) of the protein to a serine (C430S). Biochemical analyses show that Pgc1α WT stimulates higher expression of human PCK1 in HEK293T and HepG2 cells. Paradoxically, Pgc1α WT is less stable than Pgc1α p.C430S in HEK293T cells. However, the study of different post-translational modifications shows a higher O-GlcNAcylation level of Pgc1α p.C430S. This higher O-GlcNAcylation level significantly decreases the interaction between Pgc1α and PPARγ demonstrating the importance of post-translational glycosylation of PGC1α in the regulation of PCK1 activity. This, furthermore, could explain at least in part the observed epistatic effects between PGC1α and PCK1 in pigs.
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Affiliation(s)
- Pedro Latorre
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFIIQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
| | - Luis Varona
- Departamento de Anatomía, Embriología y Genética, Universidad de Zaragoza, Zaragoza, Spain
- Instituto Agroalimentario de Aragón (IA2), Zaragoza, Spain
| | - Carmen Burgos
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFIIQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
| | - José A. Carrodeguas
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFIIQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
- Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain
- IIS Aragón, Zaragoza, Spain
| | - Pascual López-Buesa
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFIIQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
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20
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Protein kinase C-alpha suppresses autophagy and induces neural tube defects via miR-129-2 in diabetic pregnancy. Nat Commun 2017; 8:15182. [PMID: 28474670 PMCID: PMC5424165 DOI: 10.1038/ncomms15182] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 03/03/2017] [Indexed: 12/19/2022] Open
Abstract
Gene deletion-induced autophagy deficiency leads to neural tube defects (NTDs), similar to those in diabetic pregnancy. Here we report the key autophagy regulators modulated by diabetes in the murine developing neuroepithelium. Diabetes predominantly leads to exencephaly, induces neuroepithelial cell apoptosis and suppresses autophagy in the forebrain and midbrain of NTD embryos. Deleting the Prkca gene, which encodes PKCα, reverses diabetes-induced autophagy impairment, cellular organelle stress and apoptosis, leading to an NTD reduction. PKCα increases the expression of miR-129-2, which is a negative regulator of autophagy. miR-129-2 represses autophagy by directly targeting PGC-1α, a positive regulator for mitochondrial function, which is disturbed by maternal diabetes. PGC-1α supports neurulation by stimulating autophagy in neuroepithelial cells. These findings identify two negative autophagy regulators, PKCα and miR-129-2, which mediate the teratogenicity of hyperglycaemia leading to NTDs. We also reveal a function for PGC-1α in embryonic development through promoting autophagy and ameliorating hyperglycaemia-induced NTDs. Maternal diabetes can induce neural tube defects (NTD). Here, the authors show that in mice, deletion of Prkca (encoding protein kinase C-alpha) restores autophagy, via suppression of miR-129-2 and reversal of reduced peroxisome proliferator-activated receptor c coactivator 1alpha, so reducing NTDs.
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21
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Mitochondrial Dysfunction and Neurodegeneration in Lysosomal Storage Disorders. Trends Mol Med 2017; 23:116-134. [DOI: 10.1016/j.molmed.2016.12.003] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 12/12/2016] [Accepted: 12/13/2016] [Indexed: 12/22/2022]
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22
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Camera DM, Smiles WJ, Hawley JA. Exercise-induced skeletal muscle signaling pathways and human athletic performance. Free Radic Biol Med 2016; 98:131-143. [PMID: 26876650 DOI: 10.1016/j.freeradbiomed.2016.02.007] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 01/28/2016] [Accepted: 02/03/2016] [Indexed: 12/18/2022]
Abstract
Skeletal muscle is a highly malleable tissue capable of altering its phenotype in response to external stimuli including exercise. This response is determined by the mode, (endurance- versus resistance-based), volume, intensity and frequency of exercise performed with the magnitude of this response-adaptation the basis for enhanced physical work capacity. However, training-induced adaptations in skeletal muscle are variable and unpredictable between individuals. With the recent application of molecular techniques to exercise biology, there has been a greater understanding of the multiplicity and complexity of cellular networks involved in exercise responses. This review summarizes the molecular and cellular events mediating adaptation processes in skeletal muscle in response to exercise. We discuss established and novel cell signaling proteins mediating key physiological responses associated with enhanced exercise performance and the capacity for reactive oxygen and nitrogen species to modulate training adaptation responses. We also examine the molecular bases underpinning heterogeneous responses to resistance and endurance exercise and the dissociation between molecular 'markers' of training adaptation and subsequent exercise performance.
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Affiliation(s)
- Donny M Camera
- Centre for Exercise and Nutrition, Mary MacKillop Institute for Health Research, Australian Catholic University, Melbourne, Vic. 3065, Australia
| | - William J Smiles
- Centre for Exercise and Nutrition, Mary MacKillop Institute for Health Research, Australian Catholic University, Melbourne, Vic. 3065, Australia
| | - John A Hawley
- Centre for Exercise and Nutrition, Mary MacKillop Institute for Health Research, Australian Catholic University, Melbourne, Vic. 3065, Australia; Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom.
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23
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Sato Y, Kobayashi H, Higuchi T, Shimada Y, Ida H, Ohashi T. TFEB overexpression promotes glycogen clearance of Pompe disease iPSC-derived skeletal muscle. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2016; 3:16054. [PMID: 27556060 PMCID: PMC4980109 DOI: 10.1038/mtm.2016.54] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/03/2016] [Accepted: 06/08/2016] [Indexed: 11/09/2022]
Abstract
Pompe disease (PD) is a lysosomal disorder caused by acid α-glucosidase (GAA) deficiency. Progressive muscular weakness is the major symptom of PD, and enzyme replacement therapy can improve the clinical outcome. However, to achieve a better clinical outcome, alternative therapeutic strategies are being investigated, including gene therapy and pharmacological chaperones. We previously used lentiviral vector-mediated GAA gene transfer in PD patient-specific induced pluripotent stem cells. Some therapeutic efficacy was observed, although glycogen accumulation was not normalized. Transcription factor EB is a master regulator of lysosomal biogenesis and autophagy that has recently been associated with muscular pathology, and is now a potential therapeutic target in PD model mice. Here, we differentiated skeletal muscle from PD patient-specific induced pluripotent stem cells by forced MyoD expression. Lentiviral vector-mediated GAA and transcription factor EB gene transfer independently improved GAA enzyme activity and reduced glycogen content in skeletal muscle derived from PD-induced pluripotent stem cells. Interestingly, GAA and transcription factor EB cooperatively improved skeletal muscle pathology, both biochemically and morphologically. Thus, our findings show that abnormal lysosomal biogenesis is associated with the muscular pathology of PD, and transcription factor EB gene transfer is effective as an add-on strategy to GAA gene transfer.
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Affiliation(s)
- Yohei Sato
- Division of Gene Therapy, Research Center for Medical Sciences, The Jikei University School of Medicine, Tokyo, Japan; Department of Pediatrics, The Jikei University School of Medicine, Tokyo, Japan
| | - Hiroshi Kobayashi
- Division of Gene Therapy, Research Center for Medical Sciences, The Jikei University School of Medicine, Tokyo, Japan; Department of Pediatrics, The Jikei University School of Medicine, Tokyo, Japan
| | - Takashi Higuchi
- Division of Gene Therapy, Research Center for Medical Sciences, The Jikei University School of Medicine , Tokyo, Japan
| | - Yohta Shimada
- Division of Gene Therapy, Research Center for Medical Sciences, The Jikei University School of Medicine , Tokyo, Japan
| | - Hiroyuki Ida
- Division of Gene Therapy, Research Center for Medical Sciences, The Jikei University School of Medicine, Tokyo, Japan; Department of Pediatrics, The Jikei University School of Medicine, Tokyo, Japan
| | - Toya Ohashi
- Division of Gene Therapy, Research Center for Medical Sciences, The Jikei University School of Medicine, Tokyo, Japan; Department of Pediatrics, The Jikei University School of Medicine, Tokyo, Japan
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24
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Talbot J, Maves L. Skeletal muscle fiber type: using insights from muscle developmental biology to dissect targets for susceptibility and resistance to muscle disease. WILEY INTERDISCIPLINARY REVIEWS-DEVELOPMENTAL BIOLOGY 2016; 5:518-34. [PMID: 27199166 DOI: 10.1002/wdev.230] [Citation(s) in RCA: 214] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 01/14/2016] [Accepted: 01/16/2016] [Indexed: 12/13/2022]
Abstract
Skeletal muscle fibers are classified into fiber types, in particular, slow twitch versus fast twitch. Muscle fiber types are generally defined by the particular myosin heavy chain isoforms that they express, but many other components contribute to a fiber's physiological characteristics. Skeletal muscle fiber type can have a profound impact on muscle diseases, including certain muscular dystrophies and sarcopenia, the aging-induced loss of muscle mass and strength. These findings suggest that some muscle diseases may be treated by shifting fiber type characteristics either from slow to fast, or fast to slow phenotypes, depending on the disease. Recent studies have begun to address which components of muscle fiber types mediate their susceptibility or resistance to muscle disease. However, for many diseases it remains largely unclear why certain fiber types are affected. A substantial body of work has revealed molecular pathways that regulate muscle fiber type plasticity and early developmental muscle fiber identity. For instance, recent studies have revealed many factors that regulate muscle fiber type through modulating the activity of the muscle regulatory transcription factor MYOD1. Future studies of muscle fiber type development in animal models will continue to enhance our understanding of factors and pathways that may provide therapeutic targets to treat muscle diseases. WIREs Dev Biol 2016, 5:518-534. doi: 10.1002/wdev.230 For further resources related to this article, please visit the WIREs website.
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Affiliation(s)
- Jared Talbot
- Department of Molecular Genetics, The Ohio State University, Columbus, OH, USA
| | - Lisa Maves
- Center for Developmental Biology and Regenerative Medicine, Seattle Children's Research Institute, Seattle, WA, USA.,Department of Pediatrics, University of Washington, Seattle, WA, USA
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25
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Lesmana R, Sinha RA, Singh BK, Zhou J, Ohba K, Wu Y, Yau WWY, Bay BH, Yen PM. Thyroid Hormone Stimulation of Autophagy Is Essential for Mitochondrial Biogenesis and Activity in Skeletal Muscle. Endocrinology 2016; 157:23-38. [PMID: 26562261 DOI: 10.1210/en.2015-1632] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Thyroid hormone (TH) and autophagy share similar functions in regulating skeletal muscle growth, regeneration, and differentiation. Although TH recently has been shown to increase autophagy in liver, the regulation and role of autophagy by this hormone in skeletal muscle is not known. Here, using both in vitro and in vivo models, we demonstrated that TH induces autophagy in a dose- and time-dependent manner in skeletal muscle. TH induction of autophagy involved reactive oxygen species (ROS) stimulation of 5'adenosine monophosphate-activated protein kinase (AMPK)-Mammalian target of rapamycin (mTOR)-Unc-51-like kinase 1 (Ulk1) signaling. TH also increased mRNA and protein expression of key autophagy genes, microtubule-associated protein light chain 3 (LC3), Sequestosome 1 (p62), and Ulk1, as well as genes that modulated autophagy and Forkhead box O (FOXO) 1/3a. TH increased mitochondrial protein synthesis and number as well as basal mitochondrial O2 consumption, ATP turnover, and maximal respiratory capacity. Surprisingly, mitochondrial activity and biogenesis were blunted when autophagy was blocked in muscle cells by Autophagy-related gene (Atg)5 short hairpin RNA (shRNA). Induction of ROS and 5'adenosine monophosphate-activated protein kinase (AMPK) by TH played a significant role in the up-regulation of Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PPARGC1A), the key regulator of mitochondrial synthesis. In summary, our findings showed that TH-mediated autophagy was essential for stimulation of mitochondrial biogenesis and activity in skeletal muscle. Moreover, autophagy and mitochondrial biogenesis were coupled in skeletal muscle via TH induction of mitochondrial activity and ROS generation.
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MESH Headings
- AMP-Activated Protein Kinases/chemistry
- AMP-Activated Protein Kinases/metabolism
- Animals
- Autophagy/drug effects
- Autophagy-Related Protein 5
- Autophagy-Related Protein-1 Homolog
- Cell Line
- Gene Expression Regulation/drug effects
- Kinetics
- Male
- Mice, Inbred C57BL
- Microtubule-Associated Proteins/antagonists & inhibitors
- Microtubule-Associated Proteins/genetics
- Microtubule-Associated Proteins/metabolism
- Mitochondria, Muscle/drug effects
- Mitochondria, Muscle/metabolism
- Mitochondria, Muscle/ultrastructure
- Mitochondrial Dynamics/drug effects
- Muscle, Skeletal/cytology
- Muscle, Skeletal/drug effects
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/ultrastructure
- Myoblasts, Skeletal/cytology
- Myoblasts, Skeletal/drug effects
- Myoblasts, Skeletal/metabolism
- Myoblasts, Skeletal/ultrastructure
- Oxygen Consumption/drug effects
- Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha
- Protein Serine-Threonine Kinases/chemistry
- Protein Serine-Threonine Kinases/metabolism
- RNA Interference
- Reactive Oxygen Species/agonists
- Reactive Oxygen Species/metabolism
- Signal Transduction/drug effects
- TOR Serine-Threonine Kinases/antagonists & inhibitors
- TOR Serine-Threonine Kinases/metabolism
- Thyroxine/metabolism
- Thyroxine/pharmacology
- Transcription Factors/agonists
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Triiodothyronine/metabolism
- Triiodothyronine/pharmacology
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Affiliation(s)
- Ronny Lesmana
- Laboratory of Hormonal Regulation (R.L., R.A.S., B.K.S., J.Z., K.O., W.WY.Y., P.M.Y.), Program of Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore 169857; Department of Physiology (R.L.), Universitas Padjadjaran, Bandung 45363, Indonesia; Department of Anatomy (Y.W., B.-H.B.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599; and Duke Molecular Physiology Institute and Department of Medicine (P.M.Y.), Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Rohit A Sinha
- Laboratory of Hormonal Regulation (R.L., R.A.S., B.K.S., J.Z., K.O., W.WY.Y., P.M.Y.), Program of Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore 169857; Department of Physiology (R.L.), Universitas Padjadjaran, Bandung 45363, Indonesia; Department of Anatomy (Y.W., B.-H.B.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599; and Duke Molecular Physiology Institute and Department of Medicine (P.M.Y.), Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Brijesh K Singh
- Laboratory of Hormonal Regulation (R.L., R.A.S., B.K.S., J.Z., K.O., W.WY.Y., P.M.Y.), Program of Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore 169857; Department of Physiology (R.L.), Universitas Padjadjaran, Bandung 45363, Indonesia; Department of Anatomy (Y.W., B.-H.B.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599; and Duke Molecular Physiology Institute and Department of Medicine (P.M.Y.), Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Jin Zhou
- Laboratory of Hormonal Regulation (R.L., R.A.S., B.K.S., J.Z., K.O., W.WY.Y., P.M.Y.), Program of Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore 169857; Department of Physiology (R.L.), Universitas Padjadjaran, Bandung 45363, Indonesia; Department of Anatomy (Y.W., B.-H.B.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599; and Duke Molecular Physiology Institute and Department of Medicine (P.M.Y.), Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Kenji Ohba
- Laboratory of Hormonal Regulation (R.L., R.A.S., B.K.S., J.Z., K.O., W.WY.Y., P.M.Y.), Program of Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore 169857; Department of Physiology (R.L.), Universitas Padjadjaran, Bandung 45363, Indonesia; Department of Anatomy (Y.W., B.-H.B.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599; and Duke Molecular Physiology Institute and Department of Medicine (P.M.Y.), Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Yajun Wu
- Laboratory of Hormonal Regulation (R.L., R.A.S., B.K.S., J.Z., K.O., W.WY.Y., P.M.Y.), Program of Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore 169857; Department of Physiology (R.L.), Universitas Padjadjaran, Bandung 45363, Indonesia; Department of Anatomy (Y.W., B.-H.B.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599; and Duke Molecular Physiology Institute and Department of Medicine (P.M.Y.), Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Winifred W Y Yau
- Laboratory of Hormonal Regulation (R.L., R.A.S., B.K.S., J.Z., K.O., W.WY.Y., P.M.Y.), Program of Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore 169857; Department of Physiology (R.L.), Universitas Padjadjaran, Bandung 45363, Indonesia; Department of Anatomy (Y.W., B.-H.B.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599; and Duke Molecular Physiology Institute and Department of Medicine (P.M.Y.), Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Boon-Huat Bay
- Laboratory of Hormonal Regulation (R.L., R.A.S., B.K.S., J.Z., K.O., W.WY.Y., P.M.Y.), Program of Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore 169857; Department of Physiology (R.L.), Universitas Padjadjaran, Bandung 45363, Indonesia; Department of Anatomy (Y.W., B.-H.B.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599; and Duke Molecular Physiology Institute and Department of Medicine (P.M.Y.), Duke University Medical Center, Durham, North Carolina 27710, USA
| | - Paul M Yen
- Laboratory of Hormonal Regulation (R.L., R.A.S., B.K.S., J.Z., K.O., W.WY.Y., P.M.Y.), Program of Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore 169857; Department of Physiology (R.L.), Universitas Padjadjaran, Bandung 45363, Indonesia; Department of Anatomy (Y.W., B.-H.B.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599; and Duke Molecular Physiology Institute and Department of Medicine (P.M.Y.), Duke University Medical Center, Durham, North Carolina 27710, USA
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Kong XY, Feng YZ, Eftestøl E, Kase ET, Haugum H, Eskild W, Rustan AC, Thoresen GH. Increased glucose utilization and decreased fatty acid metabolism in myotubes from Glmp(gt/gt) mice. Arch Physiol Biochem 2016; 122:36-45. [PMID: 26707125 DOI: 10.3109/13813455.2015.1120752] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Glycosylated lysosomal membrane protein (GLMP) has been reported to enhance the expression from a peroxisome proliferator-activated receptor alpha (PPARα) responsive promoter, but also to be an integral lysosomal membrane protein. Using myotubes established from wild-type and Glmp(gt/gt) mice, the importance of GLMP in skeletal muscle was examined. Glmp(gt/gt) myotubes expressed a more glycolytic phenotype than wild-type myotubes. Myotubes from Glmp(gt/gt) mice metabolized glucose faster and had a larger pool of intracellular glycogen, while oleic acid uptake, storage and oxidation were significantly reduced. Gene expression analyses indicated lower expression of three PPAR-isoforms, a co-regulator of PPAR (PGC1α) and several genes important for lipid metabolism in Glmp(gt/gt) myotubes. However, ablation of GLMP did not seem to substantially impair the response to PPAR agonists. In conclusion, myotubes established from Glmp(gt/gt) mice were more glycolytic than myotubes from wild-type animals, in spite of no differences in muscle fiber types in vivo.
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Affiliation(s)
| | - Yuan Zeng Feng
- b Department of Pharmaceutical Biosciences , School of Pharmacy, University of Oslo , Oslo , Norway , and
| | | | - Eili T Kase
- b Department of Pharmaceutical Biosciences , School of Pharmacy, University of Oslo , Oslo , Norway , and
| | - Hanne Haugum
- b Department of Pharmaceutical Biosciences , School of Pharmacy, University of Oslo , Oslo , Norway , and
| | | | - Arild C Rustan
- b Department of Pharmaceutical Biosciences , School of Pharmacy, University of Oslo , Oslo , Norway , and
| | - G Hege Thoresen
- b Department of Pharmaceutical Biosciences , School of Pharmacy, University of Oslo , Oslo , Norway , and
- c Department of Pharmacology , Institute of Clinical Medicine, University of Oslo and Oslo University Hospital , Oslo , Norway
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27
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Vainshtein A, Hood DA. The regulation of autophagy during exercise in skeletal muscle. J Appl Physiol (1985) 2015; 120:664-73. [PMID: 26679612 DOI: 10.1152/japplphysiol.00550.2015] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 12/11/2015] [Indexed: 12/20/2022] Open
Abstract
The merits of exercise on muscle health and well-being are numerous and well documented. However, the mechanisms underlying the robust adaptations induced by exercise, particularly on mitochondria, are less clear and much sought after. Recently, an evolutionary conserved cellular recycling mechanism known as autophagy has been implicated in the adaptations to acute and chronic exercise. A basal level of autophagy is constantly ongoing in cells and tissues, ensuring cellular clearance and energy homeostasis. This pathway can be further induced, as a survival mechanism, by cellular perturbations, such as energetic imbalance and oxidative stress. During exercise, a biphasic autophagy response is mobilized, leading to both an acute induction and a long-term potentiation of the process. Posttranslational modifications arising from upstream signaling cascades induce an acute autophagic response during a single bout of exercise by mobilizing core autophagy machinery. A transcriptional program involving the regulators Forkhead box O, transcription factor EB, p53, and peroxisome proliferator coactivator-1α is also induced to fuel sustained increases in autophagic capacity. Autophagy has also been documented to mediate chronic exercise-induced metabolic benefits, and animal models in which autophagy is perturbed do not adapt to exercise to the same extent. In this review, we discuss recent developments in the field of autophagy and exercise. We specifically highlight the molecular mechanisms activated during acute exercise that lead to a prolonged adaptive response.
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Affiliation(s)
- Anna Vainshtein
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - David A Hood
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
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28
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Todd AG, McElroy JA, Grange RW, Fuller DD, Walter GA, Byrne BJ, Falk DJ. Correcting Neuromuscular Deficits With Gene Therapy in Pompe Disease. Ann Neurol 2015; 78:222-34. [PMID: 25925726 PMCID: PMC4520217 DOI: 10.1002/ana.24433] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Revised: 04/24/2015] [Accepted: 04/24/2015] [Indexed: 12/28/2022]
Abstract
OBJECTIVE We have recently reported on the pathology of the neuromuscular junction (NMJ) in Pompe disease, reflecting disruption of neuronal and muscle homeostasis as a result of glycogen accumulation. The aim of this study was to examine how the alteration of NMJ physiology contributes to Pompe disease pathology; we performed molecular, physiological, and histochemical analyses of NMJ-related measures of the tibialis anterior muscles of young-, mid-, and late-stage alpha-glucosidase (GAA)-deficient mice. METHODS We performed intramuscular injection of an adeno-associated virus (AAV)9 vector expressing GAA (AAV9-hGAA) into the tibialis anterior muscle of Gaa(-/-) mice at early, mid, and severe pathological time points. We analyzed expression of NMJ-related genes, in situ muscle force production, and clearance of glycogen in conjunction with histological assessment of the NMJ. RESULTS Our data demonstrate that AAV9-hGAA is able to replace GAA to the affected tissue and modify AChR mRNA expression, muscle force production, motor endplate area, and innervation status. Importantly, the degree of restoration for these outcomes is limited by severity of disease. Early restoration of GAA activity was most effective, whereas late correction of GAA expression was not effective in modifying parameters reflecting NMJ structure and function nor in force restoration despite resolution of glycogen storage in muscle. INTERPRETATION Our data provide new mechanistic insight into the pathology of Pompe disease and suggest that early systemic correction to both neural and muscle tissues may be essential for successful correction of neuromuscular function in Pompe disease. Ann Neurol 2015;78:222-234.
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Affiliation(s)
- Adrian G. Todd
- Department of Pediatrics, University of Florida, Gainesville, FL
| | | | - Robert W. Grange
- Department of Human Nutrition, Foods and Exercise, Virginia Tech University, Blacksburg, VA
| | - David D. Fuller
- Department of Physical Therapy, University of Florida, Gainesville, FL
| | - Glenn A. Walter
- Department of Physiology and Functional Genomics, University of Florida, Gainesville, FL
| | - Barry J. Byrne
- Department of Pediatrics, University of Florida, Gainesville, FL
| | - Darin J. Falk
- Department of Pediatrics, University of Florida, Gainesville, FL
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29
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Vainshtein A, Desjardins EM, Armani A, Sandri M, Hood DA. PGC-1α modulates denervation-induced mitophagy in skeletal muscle. Skelet Muscle 2015; 5:9. [PMID: 25834726 PMCID: PMC4381453 DOI: 10.1186/s13395-015-0033-y] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 02/19/2015] [Indexed: 11/13/2022] Open
Abstract
Background Alterations in skeletal muscle contractile activity necessitate an efficient remodeling mechanism. In particular, mitochondrial turnover is essential for tissue homeostasis during muscle adaptations to chronic use and disuse. While mitochondrial biogenesis appears to be largely governed by the transcriptional co-activator peroxisome proliferator co-activator 1 alpha (PGC-1α), selective mitochondrial autophagy (mitophagy) is thought to mediate organelle degradation. However, whether PGC-1α plays a direct role in autophagy is currently unclear. Methods To investigate the role of the co-activator in autophagy and mitophagy during skeletal muscle remodeling, PGC-1α knockout (KO) and overexpressing (Tg) animals were unilaterally denervated, a common model of chronic muscle disuse. Results Animals lacking PGC-1α exhibited diminished mitochondrial density alongside myopathic characteristics reminiscent of autophagy-deficient muscle. Denervation promoted an induction in autophagy and lysosomal protein expression in wild-type (WT) animals, which was partially attenuated in KO animals, resulting in reduced autophagy and mitophagy flux. PGC-1α overexpression led to an increase in lysosomal capacity as well as indicators of autophagy flux but exhibited reduced localization of LC3II and p62 to mitochondria, compared to WT animals. A correlation was observed between the levels of the autophagy-lysosome master regulator transcription factor EB (TFEB) and PGC-1α in muscle, supporting their coordinated regulation. Conclusions Our investigation has uncovered a regulatory role for PGC-1α in mitochondrial turnover, not only through biogenesis but also via degradation using the autophagy-lysosome machinery. This implies a PGC-1α-mediated cross-talk between these two opposing processes, working to ensure mitochondrial homeostasis during muscle adaptation to chronic disuse. Electronic supplementary material The online version of this article (doi:10.1186/s13395-015-0033-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Anna Vainshtein
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, 4700 Keele St., Toronto, Ontario M3J 1P3 Canada
| | - Eric Ma Desjardins
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, 4700 Keele St., Toronto, Ontario M3J 1P3 Canada
| | - Andrea Armani
- Department of Biomedical Sciences, University of Padova, Viale G. Colombo 3, I-35121 Padova, Italy
| | - Marco Sandri
- Department of Biomedical Sciences, University of Padova, Viale G. Colombo 3, I-35121 Padova, Italy ; Venetian Institute of Molecular Medicine, 35129 Padova, Italy ; Telethon Institute of Genetics and Medicine (TIGEM), 80131 Napoli, Italy
| | - David A Hood
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, 4700 Keele St., Toronto, Ontario M3J 1P3 Canada
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PGC-1α buffers ROS-mediated removal of mitochondria during myogenesis. Cell Death Dis 2014; 5:e1515. [PMID: 25375380 PMCID: PMC4260723 DOI: 10.1038/cddis.2014.458] [Citation(s) in RCA: 136] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 09/02/2014] [Accepted: 09/17/2014] [Indexed: 01/03/2023]
Abstract
Mitochondrial biogenesis and mitophagy are recognized as critical processes underlying mitochondrial homeostasis. However, the molecular pathway(s) coordinating the balance between these cellular programs is still poorly investigated. Here, we show an induction of the nuclear and mitochondrial peroxisome proliferator-activated receptor gamma, coactivator 1 alpha (PGC-1α) during myogenesis, which in turn co-activates the transcription of nuclear and mtDNA-encoded mitochondrial genes. We demonstrate that PGC-1α also buffers oxidative stress occurring during differentiation by promoting the expression of antioxidant enzymes. Indeed, by downregulating PGC-1α, we observed an impairment of antioxidants expression, which was accompanied by a significant reactive oxygen species (ROS) burst and increase of oxidative damage to proteins. In parallel, we detected a decrease of mitochondrial mass and function as well as increased mitophagy through the ROS/FOXO1 pathway. Upon PGC-1α downregulation, we found ROS-dependent nuclear translocation of FOXO1 and transcription of its downstream targets including mitophagic genes such as LC3 and PINK1. Such events were significantly reverted after treatment with the antioxidant Trolox, suggesting that PGC-1α assures mitochondrial integrity by indirectly buffering ROS. Finally, the lack of PGC-1α gave rise to a decrease in MYOG and a strong induction of atrophy-related ubiquitin ligases FBXO32 (FBXO32), indicative of a degenerative process. Overall, our results reveal that in myotubes, PGC-1α takes center place in mitochondrial homeostasis during differentiation because of its ability to avoid ROS-mediated removal of mitochondria.
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Sandri M, Coletto L, Grumati P, Bonaldo P. Misregulation of autophagy and protein degradation systems in myopathies and muscular dystrophies. J Cell Sci 2014; 126:5325-33. [PMID: 24293330 DOI: 10.1242/jcs.114041] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A number of recent studies have highlighted the importance of autophagy and the ubiquitin-proteasome in the pathogenesis of muscle wasting in different types of inherited muscle disorders. Autophagy is crucial for the removal of dysfunctional organelles and protein aggregates, whereas the ubiquitin-proteasome is important for the quality control of proteins. Post-mitotic tissues, such as skeletal muscle, are particularly susceptible to aged or dysfunctional organelles and aggregation-prone proteins. Therefore, these degradation systems need to be carefully regulated in muscles. Indeed, excessive or defective activity of the autophagy lysosome or ubiquitin-proteasome leads to detrimental effects on muscle homeostasis. A growing number of studies link abnormalities in the regulation of these two pathways to myofiber degeneration and muscle weakness. Understanding the pathogenic role of these degradative systems in each inherited muscle disorder might provide novel therapeutic targets to counteract muscle wasting. In this Commentary, we will discuss the current view on the role of autophagy lysosome and ubiquitin-proteasome in the pathogenesis of myopathies and muscular dystrophies, and how alteration of these degradative systems contribute to muscle wasting in inherited muscle disorders. We will also discuss how modulating autophagy and proteasome might represent a promising strategy for counteracting muscle loss in different diseases.
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Affiliation(s)
- Marco Sandri
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
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32
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Lim JA, Li L, Raben N. Pompe disease: from pathophysiology to therapy and back again. Front Aging Neurosci 2014; 6:177. [PMID: 25183957 PMCID: PMC4135233 DOI: 10.3389/fnagi.2014.00177] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 07/04/2014] [Indexed: 11/13/2022] Open
Abstract
Pompe disease is a lysosomal storage disorder in which acid alpha-glucosidase (GAA) is deficient or absent. Deficiency of this lysosomal enzyme results in progressive expansion of glycogen-filled lysosomes in multiple tissues, with cardiac and skeletal muscle being the most severely affected. The clinical spectrum ranges from fatal hypertrophic cardiomyopathy and skeletal muscle myopathy in infants to relatively attenuated forms, which manifest as a progressive myopathy without cardiac involvement. The currently available enzyme replacement therapy (ERT) proved to be successful in reversing cardiac but not skeletal muscle abnormalities. Although the overall understanding of the disease has progressed, the pathophysiology of muscle damage remains poorly understood. Lysosomal enlargement/rupture has long been considered a mechanism of relentless muscle damage in Pompe disease. In past years, it became clear that this simple view of the pathology is inadequate; the pathological cascade involves dysfunctional autophagy, a major lysosome-dependent intracellular degradative pathway. The autophagic process in Pompe skeletal muscle is affected at the termination stage—impaired autophagosomal-lysosomal fusion. Yet another abnormality in the diseased muscle is the accelerated production of large, unrelated to ageing, lipofuscin deposits—a marker of cellular oxidative damage and a sign of mitochondrial dysfunction. The massive autophagic buildup and lipofuscin inclusions appear to cause a greater effect on muscle architecture than the enlarged lysosomes outside the autophagic regions. Furthermore, the dysfunctional autophagy affects the trafficking of the replacement enzyme and interferes with its delivery to the lysosomes. Several new therapeutic approaches have been tested in Pompe mouse models: substrate reduction therapy, lysosomal exocytosis following the overexpression of transcription factor EB and a closely related but distinct factor E3, and genetic manipulation of autophagy.
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Affiliation(s)
- Jeong-A Lim
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health Bethesda, MD, USA
| | - Lishu Li
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health Bethesda, MD, USA
| | - Nina Raben
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health Bethesda, MD, USA
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Settembre C, Ballabio A. Lysosome: regulator of lipid degradation pathways. Trends Cell Biol 2014; 24:743-50. [PMID: 25061009 PMCID: PMC4247383 DOI: 10.1016/j.tcb.2014.06.006] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 06/24/2014] [Accepted: 06/25/2014] [Indexed: 02/05/2023]
Abstract
Lipophagy is a transcriptionally regulated process. The lysosome as a sensor of lipophagy induction. Nuclear receptors link lipophagy to lipid catabolism.
Autophagy is a catabolic pathway that has a fundamental role in the adaptation to fasting and primarily relies on the activity of the endolysosomal system, to which the autophagosome targets substrates for degradation. Recent studies have revealed that the lysosomal–autophagic pathway plays an important part in the early steps of lipid degradation. In this review, we discuss the transcriptional mechanisms underlying co-regulation between lysosome, autophagy, and other steps of lipid catabolism, including the activity of nutrient-sensitive transcription factors (TFs) and of members of the nuclear receptor family. In addition, we discuss how the lysosome acts as a metabolic sensor and orchestrates the transcriptional response to fasting.
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Affiliation(s)
- Carmine Settembre
- Dulbecco Telethon Institute, Via Pietro Castellino 111, 80131, Naples, Italy; Telethon Institute of Genetics and Medicine (TIGEM), Via Pietro Castellino 111, 80131, Naples, Italy; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA; Medical Genetics, Department of Translational and Medical Science, Federico II University, Via Pansini 5, 80131 Naples, Italy.
| | - Andrea Ballabio
- Telethon Institute of Genetics and Medicine (TIGEM), Via Pietro Castellino 111, 80131, Naples, Italy; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA; Medical Genetics, Department of Translational and Medical Science, Federico II University, Via Pansini 5, 80131 Naples, Italy.
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Oxidative damage in the gastrocnemius of patients with peripheral artery disease is myofiber type selective. Redox Biol 2014; 2:921-8. [PMID: 25180168 PMCID: PMC4143812 DOI: 10.1016/j.redox.2014.07.002] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Accepted: 07/07/2014] [Indexed: 01/12/2023] Open
Abstract
Background Peripheral artery disease (PAD), a manifestation of systemic atherosclerosis that produces blockages in the arteries supplying the legs, affects approximately 5% of Americans. We have previously, demonstrated that a myopathy characterized by myofiber oxidative damage and degeneration is central to PAD pathophysiology. Objectives In this study, we hypothesized that increased oxidative damage in the myofibers of the gastrocnemius of PAD patients is myofiber-type selective and correlates with reduced myofiber size. Methods Needle biopsies were taken from the gastrocnemius of 53 PAD patients (28 with early PAD and 25 with advanced PAD) and 25 controls. Carbonyl groups (marker of oxidative damage), were quantified in myofibers of slide-mounted tissue, by quantitative fluorescence microscopy. Myofiber cross-sectional area was determined from sarcolemma labeled with wheat germ agglutinin. The tissues were also labeled for myosin I and II, permitting quantification of oxidative damage to and relative frequency of the different myofiber Types (Type I, Type II and mixed Type I/II myofibers). We compared PAD patients in early (N=28) vs. advanced (N=25) disease stage for selective, myofiber oxidative damage and altered morphometrics. Results The carbonyl content of gastrocnemius myofibers was higher in PAD patients compared to control subjects, for all three myofiber types (p<0.05). In PAD patients carbonyl content was higher (p<0.05) in Type II and I/II fibers compared to Type I fibers. Furthermore, the relative frequency and cross-sectional area of Type II fibers were lower, while the relative frequencies and cross-sectional area of Type I and Type I/II fibers were higher, in PAD compared to control gastrocnemius (p<0.05). Lastly, the type II-selective oxidative damage increased and myofiber size decreased as the disease progressed from the early to advanced stage. Conclusions Our data confirm increased myofiber oxidative damage and reduced myofiber size in PAD gastrocnemius and demonstrate that the damage is selective for type II myofibers and is worse in the most advanced stage of PAD. Peripheral artery disease, is characterized by the formation of atherosclerotic plaques that limit blood flow to the legs. There was increased myofiber oxidative damage and degeneration in the gastrocnemius of PAD patients compared to controls. Myofiber oxidative damage and morphology were worse for Type II myofibers. Type II-selective oxidative damage and abnormal morphology worsened as the PAD progressed from the early to advanced stage. Myofiber oxidative damage and degeneration is a significant contributors to the pathophysiology of PAD.
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Ferraro E, Giammarioli AM, Chiandotto S, Spoletini I, Rosano G. Exercise-induced skeletal muscle remodeling and metabolic adaptation: redox signaling and role of autophagy. Antioxid Redox Signal 2014; 21:154-76. [PMID: 24450966 PMCID: PMC4048572 DOI: 10.1089/ars.2013.5773] [Citation(s) in RCA: 133] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
SIGNIFICANCE Skeletal muscle is a highly plastic tissue. Exercise evokes signaling pathways that strongly modify myofiber metabolism and physiological and contractile properties of skeletal muscle. Regular physical activity is beneficial for health and is highly recommended for the prevention of several chronic conditions. In this review, we have focused our attention on the pathways that are known to mediate physical training-induced plasticity. RECENT ADVANCES An important role for redox signaling has recently been proposed in exercise-mediated muscle remodeling and peroxisome proliferator-activated receptor γ (PPARγ) coactivator-1α (PGC-1α) activation. Still more currently, autophagy has also been found to be involved in metabolic adaptation to exercise. CRITICAL ISSUES Both redox signaling and autophagy are processes with ambivalent effects; they can be detrimental and beneficial, depending on their delicate balance. As such, understanding their role in the chain of events induced by exercise and leading to skeletal muscle remodeling is a very complicated matter. Moreover, the study of the signaling induced by exercise is made even more difficult by the fact that exercise can be performed with several different modalities, with this having different repercussions on adaptation. FUTURE DIRECTIONS Unraveling the complexity of the molecular signaling triggered by exercise on skeletal muscle is crucial in order to define the therapeutic potentiality of physical training and to identify new pharmacological compounds that are able to reproduce some beneficial effects of exercise. In evaluating the effect of new "exercise mimetics," it will also be necessary to take into account the involvement of reactive oxygen species, reactive nitrogen species, and autophagy and their controversial effects.
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Affiliation(s)
- Elisabetta Ferraro
- 1 Pathophysiology and Treatment of Muscle Wasting Disorders Unit, IRCCS San Raffaele Pisana , Rome, Italy
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Antioxidant supplement inhibits skeletal muscle constitutive autophagy rather than fasting-induced autophagy in mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2014; 2014:315896. [PMID: 25028602 PMCID: PMC4084590 DOI: 10.1155/2014/315896] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 04/28/2014] [Accepted: 05/16/2014] [Indexed: 12/13/2022]
Abstract
In this study, we tested the hypothesis that NAC administration leads to reduced oxidative stress and thus to decreased expression of autophagy markers in young mice. Our results reveal that NAC administration results in reduced muscle mRNA levels of several autophagy markers, including Beclin-1, Atg7, LC3, Atg9, and LAMP2. However, NAC supplement fails to block the activation of skeletal muscle autophagy in response to fasting, because fasting significantly increases the mRNA level of several autophagy markers and LC3 lipidation. We further examined the effects of NAC administration on mitochondrial antioxidant capacity in fed and 24-hour fasted mice. Our results clearly show that NAC administration depresses the expression of manganese superoxide dismutase (MnSOD) and TP53-induced glycolysis and apoptosis regulator (TIGAR), both of which play a predominant antioxidant role in mitochondria by reducing ROS level. In addition, we found no beneficial effect of NAC supplement on muscle mass but it can protect from muscle loss in response to fasting. Collectively, our findings indicate that ROS is required for skeletal muscle constitutive autophagy, rather than starvation-induced autophagy, and that antioxidant NAC inhibits constitutive autophagy by the regulation of mitochondrial ROS production and antioxidant capacity.
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Qi Z, Zhai X, Ding S. How to explain exercise-induced phenotype from molecular data: rethink and reconstruction based on AMPK and mTOR signaling. SPRINGERPLUS 2013; 2:693. [PMID: 24404437 PMCID: PMC3879393 DOI: 10.1186/2193-1801-2-693] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 12/17/2013] [Indexed: 12/25/2022]
Abstract
During endurance and resistance exercise training, AMPK and mTOR signaling were known as selective pathways implicating the differentiation of exercise-induced phenotype in skeletal muscle. Among the previous studies, however, the differences in exercise protocol, the individuality and the genetic heterogeneity within species make it difficult to reach a consistent conclusion in the roles of AMPK and mTOR signaling. In this review, we aim not to reanalyze the previous articles and present the research progress of AMPK and mTOR signaling in exercise, but to propose an abstract general hypothesis for exercise-induced phenotype. Generally, exercise- induced skeletal muscle phenotype is independent of one and a few genes, proteins and signaling pathways. Convergent adaptation will better summarize the specificity of skeletal muscle phenotype in response to a single mode of exercise. Backward adaptation will open a new concept to illustrate the process of exercise-induced adaptation, such as mitochondrial quality control and muscle mass homeostasis.
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Affiliation(s)
- Zhengtang Qi
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention, Ministry of Education, East China Normal University, Shanghai, 200241 China ; College of Physical Education and Health, East China Normal University, Shanghai, 200241 China
| | - Xiaofeng Zhai
- Department of Traditional Chinese Medicine, Changhai Hospital, Shanghai, 200438 China
| | - Shuzhe Ding
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention, Ministry of Education, East China Normal University, Shanghai, 200241 China ; College of Physical Education and Health, East China Normal University, Shanghai, 200241 China
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Neel BA, Lin Y, Pessin JE. Skeletal muscle autophagy: a new metabolic regulator. Trends Endocrinol Metab 2013; 24:635-43. [PMID: 24182456 PMCID: PMC3849822 DOI: 10.1016/j.tem.2013.09.004] [Citation(s) in RCA: 121] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 09/18/2013] [Accepted: 09/27/2013] [Indexed: 12/17/2022]
Abstract
Autophagy classically functions as a physiological process to degrade cytoplasmic components, protein aggregates, and/or organelles, as a mechanism for nutrient breakdown, and as a regulator of cellular architecture. Proper autophagic flux is vital for both functional skeletal muscle, which controls the support and movement of the skeleton, and muscle metabolism. The role of autophagy as a metabolic regulator in muscle has been previously studied; however, the underlying molecular mechanisms that control autophagy in skeletal muscle have only recently begun to emerge. We review recent literature on the molecular pathways controlling skeletal muscle autophagy and discuss how they connect autophagy to metabolic regulation. We also focus on the implications these studies hold for understanding metabolic and muscle-wasting diseases.
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Affiliation(s)
- Brian A Neel
- Albert Einstein College of Medicine, Price Center for Genetic and Translational Medicine, Department of Medicine and Molecular Pharmacology, 1301 Morris Park Avenue, Bronx, NY 10461, USA
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Skeletal muscle, autophagy, and physical activity: the ménage à trois of metabolic regulation in health and disease. J Mol Med (Berl) 2013; 92:127-37. [PMID: 24271008 DOI: 10.1007/s00109-013-1096-z] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 10/10/2013] [Accepted: 10/23/2013] [Indexed: 01/07/2023]
Abstract
Metabolic homeostasis is essential for cellular survival and proper tissue function. Multi-systemic metabolic regulation is therefore vital for good health. A number of tissues have the task of maintaining appropriate metabolism, and skeletal muscle is the most abundant of them. Muscle possesses a remarkable plasticity and is able to rapidly adapt to changes in energetic demands by fine-tuning the balance between catabolic and anabolic processes. Autophagy is a catabolic process responsible for the degradation of protein aggregates and damaged organelles, through the autophagosome-lysosome system. Proper regulation of autophagy flux is fundamental for organism homeostasis under physiological conditions and even more in response to metabolic stress, such as during physical activity and nutritional deficits. Both deficient and excessive autophagy are harmful for health and have devastating consequences in a myriad of pathologies. The regulation of autophagy flux in various tissues, and in particular in skeletal muscle, is of great importance for health and tissue homeostasis and represents a feasible mechanism by which physical exercise exerts its beneficial effects on muscle and whole body metabolism. This review is focused on the key molecular mechanisms regulating macromolecule and organelle turnover in muscle during alterations in nutrient availability and energetic demands, as well as their involvement in disease pathogenesis.
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Bonaldo P, Sandri M. Cellular and molecular mechanisms of muscle atrophy. Dis Model Mech 2013; 6:25-39. [PMID: 23268536 PMCID: PMC3529336 DOI: 10.1242/dmm.010389] [Citation(s) in RCA: 825] [Impact Index Per Article: 75.0] [Reference Citation Analysis] [Abstract] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Skeletal muscle is a plastic organ that is maintained by multiple pathways regulating cell and protein turnover. During muscle atrophy, proteolytic systems are activated, and contractile proteins and organelles are removed, resulting in the shrinkage of muscle fibers. Excessive loss of muscle mass is associated with poor prognosis in several diseases, including myopathies and muscular dystrophies, as well as in systemic disorders such as cancer, diabetes, sepsis and heart failure. Muscle loss also occurs during aging. In this paper, we review the key mechanisms that regulate the turnover of contractile proteins and organelles in muscle tissue, and discuss how impairments in these mechanisms can contribute to muscle atrophy. We also discuss how protein synthesis and degradation are coordinately regulated by signaling pathways that are influenced by mechanical stress, physical activity, and the availability of nutrients and growth factors. Understanding how these pathways regulate muscle mass will provide new therapeutic targets for the prevention and treatment of muscle atrophy in metabolic and neuromuscular diseases.
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Affiliation(s)
- Paolo Bonaldo
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy.
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Abstract
PURPOSE OF REVIEW There are a variety of pathophysiologic conditions that are known to induce skeletal muscle atrophy. However, muscle wasting can occur through multiple distinct signaling pathways with differential sensitivity between selective skeletal muscle fiber subtypes. This review summarizes some of the underlying molecular mechanisms responsible for fiber-specific muscle mass regulation. RECENT FINDINGS Peroxisome proliferator-activated receptor gamma coactivator 1-alpha protects slow-twitch oxidative fibers from denervation/immobilization (disuse)-induced muscle atrophies. Nutrient-related muscle atrophies, such as those induced by cancer cachexia, sepsis, chronic heart failure, or diabetes, are largely restricted to fast-twitch glycolytic fibers, of which the underlying mechanism is usually related to abnormality of protein degradation, including proteasomal and lysosomal pathways. In contrast, nuclear factor kappaB activation apparently serves a dual function by inducing both fast-twitch fiber atrophy and slow-twitch fiber degeneration. SUMMARY Fast-twitch glycolytic fibers are more vulnerable than slow-twitch oxidative fibers under a variety of atrophic conditions related to signaling transduction of Forkhead box O family, autophagy inhibition, transforming growth factor beta family, and nuclear factor-kappaB. The resistance of oxidative fibers may result from the protection of peroxisome proliferator-activated receptor gamma coactivator 1-alpha.
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Affiliation(s)
- Yichen Wang
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Diabetes Research and Training Center, Bronx, New York, USA
| | - Jeffrey E. Pessin
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Diabetes Research and Training Center, Bronx, New York, USA
- Department of Medicine, Albert Einstein College of Medicine, Diabetes Research and Training Center, Bronx, New York, USA
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Transcriptional Regulation by Nuclear Corepressors and PGC-1α: Implications for Mitochondrial Quality Control and Insulin Sensitivity. PPAR Res 2012; 2012:348245. [PMID: 23304112 PMCID: PMC3523614 DOI: 10.1155/2012/348245] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Revised: 11/06/2012] [Accepted: 11/13/2012] [Indexed: 02/07/2023] Open
Abstract
The peroxisome proliferator-activated receptors (PPARs) and estrogen-related receptor (ERRα) are ligand-activated nuclear receptors that coordinately regulate gene expression. Recent evidence suggests that nuclear corepressors, NCoR, RIP140, and SMRT, repress nuclear receptors-mediated transcriptional activity on specific promoters, and thus regulate insulin sensitivity, adipogenesis, mitochondrial number, and activity in vivo. Moreover, the coactivator PGC-1α that increases mitochondrial biogenesis during exercise and calorie restriction directly regulates autophagy in skeletal muscle and mitophagy in the pathogenesis of Parkinson's disease. In this paper, we discuss the PGC-1α's novel role in mitochondrial quality control and the role of nuclear corepressors in regulating insulin sensitivity and interacting with PGC-1α.
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Nilsson MI, Samjoo IA, Hettinga BP, Koeberl DD, Zhang H, Hawke TJ, Nissar AA, Ali T, Brandt L, Ansari MU, Hazari H, Patel N, Amon J, Tarnopolsky MA. Aerobic training as an adjunctive therapy to enzyme replacement in Pompe disease. Mol Genet Metab 2012; 107:469-79. [PMID: 23041258 DOI: 10.1016/j.ymgme.2012.09.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Revised: 09/11/2012] [Accepted: 09/11/2012] [Indexed: 01/06/2023]
Abstract
BACKGROUND Aerobic exercise may be used in conjunction with enzyme replacement therapy (ERT) to attenuate cardiovascular deconditioning, skeletal muscle wasting, and loss of motor function in Pompe disease (glycogen storage disease type II; GSDII), but the effects on lysosomal glycogen content and macroautophagy have not been defined to date. PURPOSE The main objectives of this study were to determine if acute aerobic exercise enhances 24-h uptake of recombinant human enzyme (rhGAA; Myozyme® [aim 1]) and if endurance training improves disease pathology when combined with ERT [aim 2] in Pompe mice. METHODS For the first aim in our study, Pompe mutant mice (6(neo)/6(neo)) were grouped into ERT (Myozyme® injection only [40 mg/kg]) and ERT+EX (Myozyme® injection followed by 90 min treadmill exercise) cohorts, and enzyme uptake was assessed in the heart and quadriceps 24h post injection. For the second aim of our study, mutant mice were randomized into control, endurance-trained, enzyme-treated, or combination therapy groups. Exercised animals underwent 14 weeks of progressive treadmill training with or without biweekly Myozyme® injections (40 mg/kg) and tissues were harvested 1 week post last treatment. RESULTS Myozyme® uptake (GAA activity) was not improved in ERT+EX over ERT alone at 24-h post injection. Endurance exercise training, with or without ERT, improved aerobic capacity and normalized grip strength, motor function, and lean mass (P<0.05), but did not reduce glycogen content or normalize macroautophagy beyond traditional enzyme replacement therapy. CONCLUSIONS Endurance training is beneficial as an adjunctive therapy to ERT in Pompe disease, although it works by mechanisms independent of a reduction in glycogen content.
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Affiliation(s)
- Mats I Nilsson
- Department of Pediatrics and Medicine, Neuromuscular Clinic, McMaster University, Hamilton, Ontario, Canada
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Ravaglia S, De Filippi P, Pichiecchio A, Ponzio M, Saeidi Garaghani K, Poloni GU, Bini P, Danesino C. Can genes influencing muscle function affect the therapeutic response to enzyme replacement therapy (ERT) in late-onset type II glycogenosis? Mol Genet Metab 2012; 107:104-10. [PMID: 22704482 DOI: 10.1016/j.ymgme.2012.05.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Revised: 05/22/2012] [Accepted: 05/22/2012] [Indexed: 11/26/2022]
Abstract
The purpose of this study is to analyze the role of genes known to influence muscle performances on the outcome after enzyme replacement treatment (ERT) in type II Glycogenosis (GSDII). We analyzed 16 patients receiving ERT for ≥two years. We assessed the changes in muscle strength by hand-held dynamometry, muscle mass by quantitative MRI, and resistance to exercise by the 6-minute walking test. Exercise gene assessment included angiotensin converting enzyme insertion/deletion polymorphism (ACE), alpha-actinin3 R577X polymorphism (ACTN3), and peroxisome proliferator activated receptor alpha G/C polymorphism (PPARα). Independent of disease severity, one third of patients had a poor response to ERT, which was found to be associated with ACE DD genotype. The ACTN3 null polymorphism appeared to exert a positive effect on treatment efficacy, while PPARα did not seem to exert any influence at all. We conclude that poor treatment outcome in ACE DD genotypes is in line with previous observation of a worse disease course in this subpopulation, and suggests the need for a more careful follow-up and individualized treatment approaches for these patients. Exercise genes may provide a new opportunity for studying the outcome after treatment and the muscle regeneration abilities in other models of genetic myopathies.
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Affiliation(s)
- Sabrina Ravaglia
- Department of Public Health and Neurosciences, University of Pavia, Italy
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The role of autophagy in the pathogenesis of glycogen storage disease type II (GSDII). Cell Death Differ 2012; 19:1698-708. [PMID: 22595755 DOI: 10.1038/cdd.2012.52] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Regulated removal of proteins and organelles by autophagy-lysosome system is critical for muscle homeostasis. Excessive activation of autophagy-dependent degradation contributes to muscle atrophy and cachexia. Conversely, inhibition of autophagy causes accumulation of protein aggregates and abnormal organelles, leading to myofiber degeneration and myopathy. Defects in lysosomal function result in severe muscle disorders such as Pompe (glycogen storage disease type II (GSDII)) disease, characterized by an accumulation of autophagosomes. However, whether autophagy is detrimental or not in muscle function of Pompe patients is unclear. We studied infantile and late-onset GSDII patients and correlated impairment of autophagy with muscle wasting. We also monitored autophagy in patients who received recombinant α-glucosidase. Our data show that infantile and late-onset patients have different levels of autophagic flux, accumulation of p62-positive protein aggregates and expression of atrophy-related genes. Although the infantile patients show impaired autophagic function, the late-onset patients display an interesting correlation among autophagy impairment, atrophy and disease progression. Moreover, reactivation of autophagy in vitro contributes to acid α-glucosidase maturation in both healthy and diseased myotubes. Together, our data suggest that autophagy protects myofibers from disease progression and atrophy in late-onset patients.
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