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Pokharel MD, Garcia-Flores A, Marciano D, Franco MC, Fineman JR, Aggarwal S, Wang T, Black SM. Mitochondrial network dynamics in pulmonary disease: Bridging the gap between inflammation, oxidative stress, and bioenergetics. Redox Biol 2024; 70:103049. [PMID: 38295575 PMCID: PMC10844980 DOI: 10.1016/j.redox.2024.103049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Accepted: 01/16/2024] [Indexed: 02/02/2024] Open
Abstract
Once thought of in terms of bioenergetics, mitochondria are now widely accepted as both the orchestrator of cellular health and the gatekeeper of cell death. The pulmonary disease field has performed extensive efforts to explore the role of mitochondria in regulating inflammation, cellular metabolism, apoptosis, and oxidative stress. However, a critical component of these processes needs to be more studied: mitochondrial network dynamics. Mitochondria morphologically change in response to their environment to regulate these processes through fusion, fission, and mitophagy. This allows mitochondria to adapt their function to respond to cellular requirements, a critical component in maintaining cellular homeostasis. For that reason, mitochondrial network dynamics can be considered a bridge that brings multiple cellular processes together, revealing a potential pathway for therapeutic intervention. In this review, we discuss the critical modulators of mitochondrial dynamics and how they are affected in pulmonary diseases, including chronic obstructive pulmonary disease (COPD), idiopathic pulmonary fibrosis (IPF), acute lung injury (ALI), and pulmonary arterial hypertension (PAH). A dysregulated mitochondrial network plays a crucial role in lung disease pathobiology, and aberrant fission/fusion/mitophagy pathways are druggable processes that warrant further exploration. Thus, we also discuss the candidates for lung disease therapeutics that regulate mitochondrial network dynamics.
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Affiliation(s)
- Marissa D Pokharel
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Alejandro Garcia-Flores
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA
| | - David Marciano
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Maria C Franco
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Jeffrey R Fineman
- Department of Pediatrics, UC San Francisco, San Francisco, CA, 94143, USA
| | - Saurabh Aggarwal
- Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Ting Wang
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, 33199, USA
| | - Stephen M Black
- Center for Translational Science, Florida International University, 11350 SW Village Parkway, Port St. Lucie, FL, 34987-2352, USA; Department of Molecular & Cellular Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA; Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, 33199, USA.
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2
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Henrot P, Dupin I, Schilfarth P, Esteves P, Blervaque L, Zysman M, Gouzi F, Hayot M, Pomiès P, Berger P. Main Pathogenic Mechanisms and Recent Advances in COPD Peripheral Skeletal Muscle Wasting. Int J Mol Sci 2023; 24:ijms24076454. [PMID: 37047427 PMCID: PMC10095391 DOI: 10.3390/ijms24076454] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 03/27/2023] [Accepted: 03/28/2023] [Indexed: 04/14/2023] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a worldwide prevalent respiratory disease mainly caused by tobacco smoke exposure. COPD is now considered as a systemic disease with several comorbidities. Among them, skeletal muscle dysfunction affects around 20% of COPD patients and is associated with higher morbidity and mortality. Although the histological alterations are well characterized, including myofiber atrophy, a decreased proportion of slow-twitch myofibers, and a decreased capillarization and oxidative phosphorylation capacity, the molecular basis for muscle atrophy is complex and remains partly unknown. Major difficulties lie in patient heterogeneity, accessing patients' samples, and complex multifactorial process including extrinsic mechanisms, such as tobacco smoke or disuse, and intrinsic mechanisms, such as oxidative stress, hypoxia, or systemic inflammation. Muscle wasting is also a highly dynamic process whose investigation is hampered by the differential protein regulation according to the stage of atrophy. In this review, we report and discuss recent data regarding the molecular alterations in COPD leading to impaired muscle mass, including inflammation, hypoxia and hypercapnia, mitochondrial dysfunction, diverse metabolic changes such as oxidative and nitrosative stress and genetic and epigenetic modifications, all leading to an impaired anabolic/catabolic balance in the myocyte. We recapitulate data concerning skeletal muscle dysfunction obtained in the different rodent models of COPD. Finally, we propose several pathways that should be investigated in COPD skeletal muscle dysfunction in the future.
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Affiliation(s)
- Pauline Henrot
- Centre de Recherche Cardio-Thoracique de Bordeaux, Univ. Bordeaux, U1045, F-33604 Pessac, France
- INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, U1045, CIC 1401, F-33604 Pessac, France
- CHU de Bordeaux, Service d'Exploration Fonctionnelle Respiratoire, CIC 1401, Service de Pneumologie, F-33604 Pessac, France
| | - Isabelle Dupin
- Centre de Recherche Cardio-Thoracique de Bordeaux, Univ. Bordeaux, U1045, F-33604 Pessac, France
- INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, U1045, CIC 1401, F-33604 Pessac, France
| | - Pierre Schilfarth
- Centre de Recherche Cardio-Thoracique de Bordeaux, Univ. Bordeaux, U1045, F-33604 Pessac, France
- INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, U1045, CIC 1401, F-33604 Pessac, France
- CHU de Bordeaux, Service d'Exploration Fonctionnelle Respiratoire, CIC 1401, Service de Pneumologie, F-33604 Pessac, France
| | - Pauline Esteves
- Centre de Recherche Cardio-Thoracique de Bordeaux, Univ. Bordeaux, U1045, F-33604 Pessac, France
- INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, U1045, CIC 1401, F-33604 Pessac, France
| | - Léo Blervaque
- PhyMedExp, INSERM-CNRS-Montpellier University, F-34090 Montpellier, France
| | - Maéva Zysman
- Centre de Recherche Cardio-Thoracique de Bordeaux, Univ. Bordeaux, U1045, F-33604 Pessac, France
- INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, U1045, CIC 1401, F-33604 Pessac, France
- CHU de Bordeaux, Service d'Exploration Fonctionnelle Respiratoire, CIC 1401, Service de Pneumologie, F-33604 Pessac, France
| | - Fares Gouzi
- PhyMedExp, INSERM-CNRS-Montpellier University, CHRU Montpellier, F-34090 Montpellier, France
| | - Maurice Hayot
- PhyMedExp, INSERM-CNRS-Montpellier University, CHRU Montpellier, F-34090 Montpellier, France
| | - Pascal Pomiès
- PhyMedExp, INSERM-CNRS-Montpellier University, F-34090 Montpellier, France
| | - Patrick Berger
- Centre de Recherche Cardio-Thoracique de Bordeaux, Univ. Bordeaux, U1045, F-33604 Pessac, France
- INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, U1045, CIC 1401, F-33604 Pessac, France
- CHU de Bordeaux, Service d'Exploration Fonctionnelle Respiratoire, CIC 1401, Service de Pneumologie, F-33604 Pessac, France
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3
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Zhang Y, Shi X, Sheng H, Hu Y, Pang B, Ma Y, Jin J. Changes in diaphragm contractility in cigarette smoking-exposed and smoking cessation rats are associated with alterations in mitochondrial morphology and homeostasis. Basic Clin Pharmacol Toxicol 2022; 131:392-405. [PMID: 35972955 DOI: 10.1111/bcpt.13781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 07/16/2022] [Accepted: 08/11/2022] [Indexed: 11/28/2022]
Abstract
The effects of cigarette smoking (CS) cessation on the diaphragm are unknown, as are the CS-induced diaphragmatic mitochondrial changes. We examined the changes in diaphragm contractility, as well as alterations in mitochondrial morphology, function and homoeostasis during CS exposure and after cessation. Rats were randomly divided into CS exposure and CS cessation groups: 3-month CS (S3), 6-month CS (S6), 6-month CS followed by 3-month cessation (S6N3). The changes in the diaphragm were investigated, including contractile properties, the ultrastructure, mitochondrial function and the expression of markers of mitochondrial homoeostasis. CS caused irreversible histological disruption and functional depression in the lungs, along with significantly declines in diaphragmatic contractility and more severely in extensor digitorum longus muscular contractility. Such declines were recovered after 3-month CS cessation. CS exposure disrupted the diaphragmatic mitochondrial morphology and function (S6), which was significantly alleviated in the S6N3 group. The mitochondrial homoeostasis was depressed (S6), as indicated by the downregulation of Pink1 and Mfn1. Interestingly, the Mfn1 level was recovered after smoking cessation (S6N3). In conclusion, smoking cessation eased CS-induced diaphragmatic dysfunction and mitochondrial deregulation, which are likely associated with deregulated mitochondrial homoeostasis.
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Affiliation(s)
- Yijie Zhang
- Department of Emergency Medicine, Beijing Shijitan Hospital, Capital Medical University, Beijing, China.,Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China.,Department of Respiratory and Critical Care Medicine, Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Xiaoqian Shi
- The Clinical Research Center, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Haiyan Sheng
- Department of Respiratory and Critical Care Medicine, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Yuhan Hu
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Baosen Pang
- The Clinical Research Center, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Yingmin Ma
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China.,Department of Respiratory and Critical Care Medicine, Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Jiawei Jin
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China.,The Clinical Research Center, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
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4
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Walsh CJ, Batt J, Herridge MS, Mathur S, Bader GD, Hu P, Khatri P, Dos Santos CC. Comprehensive multi-cohort transcriptional meta-analysis of muscle diseases identifies a signature of disease severity. Sci Rep 2022; 12:11260. [PMID: 35789175 PMCID: PMC9253003 DOI: 10.1038/s41598-022-15003-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 05/03/2022] [Indexed: 11/09/2022] Open
Abstract
Muscle diseases share common pathological features suggesting common underlying mechanisms. We hypothesized there is a common set of genes dysregulated across muscle diseases compared to healthy muscle and that these genes correlate with severity of muscle disease. We performed meta-analysis of transcriptional profiles of muscle biopsies from human muscle diseases and healthy controls. Studies obtained from public microarray repositories fulfilling quality criteria were divided into six categories: (i) immobility, (ii) inflammatory myopathies, (iii) intensive care unit (ICU) acquired weakness (ICUAW), (iv) congenital muscle diseases, (v) chronic systemic diseases, (vi) motor neuron disease. Patient cohorts were separated in discovery and validation cohorts retaining roughly equal proportions of samples for the disease categories. To remove bias towards a specific muscle disease category we repeated the meta-analysis five times by removing data sets corresponding to one muscle disease class at a time in a "leave-one-disease-out" analysis. We used 636 muscle tissue samples from 30 independent cohorts to identify a 52 gene signature (36 up-regulated and 16 down-regulated genes). We validated the discriminatory power of this signature in 657 muscle biopsies from 12 additional patient cohorts encompassing five categories of muscle diseases with an area under the receiver operating characteristic curve of 0.91, 83% sensitivity, and 85.3% specificity. The expression score of the gene signature inversely correlated with quadriceps muscle mass (r = -0.50, p-value = 0.011) in ICUAW and shoulder abduction strength (r = -0.77, p-value = 0.014) in amyotrophic lateral sclerosis (ALS). The signature also positively correlated with histologic assessment of muscle atrophy in ALS (r = 0.88, p-value = 1.62 × 10-3) and fibrosis in muscular dystrophy (Jonckheere trend test p-value = 4.45 × 10-9). Our results identify a conserved transcriptional signature associated with clinical and histologic muscle disease severity. Several genes in this conserved signature have not been previously associated with muscle disease severity.
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Affiliation(s)
- C J Walsh
- Keenan Research Center for Biomedical Science, Saint Michael's Hospital, Toronto, ON, Canada.,Institute of Medical Sciences, University of Toronto, Toronto, ON, Canada
| | - J Batt
- Keenan Research Center for Biomedical Science, Saint Michael's Hospital, Toronto, ON, Canada.,Institute of Medical Sciences, University of Toronto, Toronto, ON, Canada
| | - M S Herridge
- Interdepartmental Division of Critical Care, University Health Network, University of Toronto, Toronto, ON, Canada
| | - S Mathur
- Department of Physical Therapy, University of Toronto, Toronto, ON, Canada
| | - G D Bader
- The Donnelly Center, University of Toronto, Toronto, ON, Canada
| | - P Hu
- Department of Biochemistry and Medical Genetics, University of Manitoba, Winnipeg, MB, Canada
| | - P Khatri
- Stanford Institute for Immunity, Transplantation and Infection (ITI), Stanford University School of Medicine, Stanford, CA, USA.,Department of Medicine, Stanford Center for Biomedical Informatics Research (BMIR), Stanford University, Stanford, CA, USA
| | - C C Dos Santos
- Keenan Research Center for Biomedical Science, Saint Michael's Hospital, Toronto, ON, Canada. .,Interdepartmental Division of Critical Care, University of Toronto, Toronto, ON, Canada.
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Latimer LE, Constantin-Teodosiu D, Popat B, Constantin D, Houchen-Wolloff L, Bolton CE, Steiner MC, Greenhaff PL. Whole-body and muscle responses to aerobic exercise training and withdrawal in ageing and COPD. Eur Respir J 2022; 59:13993003.01507-2021. [PMID: 34588196 PMCID: PMC9095946 DOI: 10.1183/13993003.01507-2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 09/19/2021] [Indexed: 01/05/2023]
Abstract
BACKGROUND Chronic obstructive pulmonary disease (COPD) patients exhibit lower peak oxygen uptake (V'O2 peak), altered muscle metabolism and impaired exercise tolerance compared with age-matched controls. Whether these traits reflect muscle-level deconditioning (impacted by ventilatory constraints) and/or dysfunction in mitochondrial ATP production capacity is debated. By studying aerobic exercise training (AET) at a matched relative intensity and subsequent exercise withdrawal period we aimed to elucidate the whole-body and muscle mitochondrial responsiveness of healthy young (HY), healthy older (HO) and COPD volunteers to whole-body exercise. METHODS HY (n=10), HO (n=10) and COPD (n=20) volunteers were studied before and after 8 weeks of AET (65% V'O2 peak) and after 4 weeks of exercise withdrawal. V'O2 peak, muscle maximal mitochondrial ATP production rate (MAPR), mitochondrial content, mitochondrial DNA (mtDNA) copy number and abundance of 59 targeted fuel metabolism mRNAs were determined at all time-points. RESULTS Muscle MAPR (normalised for mitochondrial content) was not different for any substrate combination in HO, HY and COPD at baseline, but mtDNA copy number relative to a nuclear-encoded housekeeping gene (mean±sd) was greater in HY (804±67) than in HO (631±69; p=0.041). AET increased V'O2 peak in HO (17%; p=0.002) and HY (21%; p<0.001), but not COPD (p=0.603). Muscle MAPR for palmitate increased with training in HO (57%; p=0.041) and HY (56%; p=0.003), and decreased with exercise withdrawal in HO (-45%; p=0.036) and HY (-30%; p=0.016), but was unchanged in COPD (p=0.594). mtDNA copy number increased with AET in HY (66%; p=0.001), but not HO (p=0.081) or COPD (p=0.132). The observed changes in muscle mRNA abundance were similar in all groups after AET and exercise withdrawal. CONCLUSIONS Intrinsic mitochondrial function was not impaired by ageing or COPD in the untrained state. Whole-body and muscle mitochondrial responses to AET were robust in HY, evident in HO, but deficient in COPD. All groups showed robust muscle mRNA responses. Higher relative exercise intensities during whole-body training may be needed to maximise whole-body and muscle mitochondrial adaptation in COPD.
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Affiliation(s)
- Lorna E Latimer
- Dept of Respiratory Sciences, University of Leicester, Leicester, UK.,Institute for Lung Health, National Institute for Health Research Leicester Biomedical Research Centre - Respiratory, Glenfield Hospital, Leicester, UK.,Joint first authorship
| | - Dumitru Constantin-Teodosiu
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research, Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, UK.,Joint first authorship
| | - Bhavesh Popat
- Dept of Respiratory Sciences, University of Leicester, Leicester, UK.,University Hospitals of Derby and Burton NHS Foundation Trust, Derby, UK
| | - Despina Constantin
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research, Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, UK.,National Institute for Health Research Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Linzy Houchen-Wolloff
- Dept of Respiratory Sciences, University of Leicester, Leicester, UK.,Institute for Lung Health, National Institute for Health Research Leicester Biomedical Research Centre - Respiratory, Glenfield Hospital, Leicester, UK.,University Hospitals of Leicester NHS Trust, Centre for Exercise and Rehabilitation Science, Glenfield Hospital, Leicester, UK
| | - Charlotte E Bolton
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research, Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, UK.,National Institute for Health Research Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust, Nottingham, UK.,Centre for Respiratory Research, Translational Medical Sciences, School of Medicine, University of Nottingham, City Hospital, Nottingham, UK
| | - Michael C Steiner
- Dept of Respiratory Sciences, University of Leicester, Leicester, UK.,Institute for Lung Health, National Institute for Health Research Leicester Biomedical Research Centre - Respiratory, Glenfield Hospital, Leicester, UK
| | - Paul L Greenhaff
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research, Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, University of Nottingham, Nottingham, UK .,National Institute for Health Research Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust, Nottingham, UK
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6
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Prolonged Mechanical Ventilation: Outcomes and Management. J Clin Med 2022; 11:jcm11092451. [PMID: 35566577 PMCID: PMC9103623 DOI: 10.3390/jcm11092451] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/23/2022] [Accepted: 04/24/2022] [Indexed: 02/01/2023] Open
Abstract
The number of patients requiring prolonged mechanical ventilation (PMV) is increasing worldwide, placing a burden on healthcare systems. Therefore, investigating the pathophysiology, risk factors, and treatment for PMV is crucial. Various underlying comorbidities have been associated with PMV. The pathophysiology of PMV includes the presence of an abnormal respiratory drive or ventilator-induced diaphragm dysfunction. Numerous studies have demonstrated that ventilator-induced diaphragm dysfunction is related to increases in in-hospital deaths, nosocomial pneumonia, oxidative stress, lung tissue hypoxia, ventilator dependence, and costs. Thus far, the pathophysiologic evidence for PMV has been derived from clinical human studies and experimental studies in animals. Moreover, recent studies have demonstrated the outcome benefits of pharmacological agents and rehabilitative programs for patients requiring PMV. However, methodological limitations affected these studies. Controlled prospective studies with an adequate number of participants are necessary to provide evidence of the mechanism, prognosis, and treatment of PMV. The great epidemiologic impact of PMV and the potential development of treatment make this a key research field.
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Alfahad AJ, Alzaydi MM, Aldossary AM, Alshehri AA, Almughem FA, Zaidan NM, Tawfik EA. Current views in chronic obstructive pulmonary disease pathogenesis and management. Saudi Pharm J 2022; 29:1361-1373. [PMID: 35002373 PMCID: PMC8720819 DOI: 10.1016/j.jsps.2021.10.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 10/22/2021] [Indexed: 01/11/2023] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a progressive lung dysfunction caused mainly by inhaling toxic particles and cigarette smoking (CS). The continuous exposure to ruinous molecules can lead to abnormal inflammatory responses, permanent damages to the respiratory system, and irreversible pathological changes. Other factors, such as genetics and aging, influence the development of COPD. In the last decade, accumulating evidence suggested that mitochondrial alteration, including mitochondrial DNA damage, increased mitochondrial reactive oxygen species (ROS), abnormal autophagy, and apoptosis, have been implicated in the pathogenesis of COPD. The alteration can also extend to epigenetics, namely DNA methylation, histone modification, and non-coding RNA. This review will discuss the recent progressions in COPD pathology, pathophysiology, and molecular pathways. More focus will be shed on mitochondrial and epigenetic variations related to COPD development and the role of nanomedicine as a potential tool for the prevention and treatment of this disease.
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Affiliation(s)
- Ahmed J Alfahad
- National Center of Biotechnology, Life Science and Environment Research Institute, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia
| | - Mai M Alzaydi
- National Center of Biotechnology, Life Science and Environment Research Institute, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia
| | - Ahmad M Aldossary
- National Center of Biotechnology, Life Science and Environment Research Institute, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia
| | - Abdullah A Alshehri
- National Center of Biotechnology, Life Science and Environment Research Institute, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia
| | - Fahad A Almughem
- National Center of Biotechnology, Life Science and Environment Research Institute, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia
| | - Nada M Zaidan
- Center of Excellence in Biomedicine, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia
| | - Essam A Tawfik
- National Center of Biotechnology, Life Science and Environment Research Institute, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia.,Center of Excellence in Biomedicine, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia
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8
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Gutiérrez-Arias R, Jalil Y, Fuentes-Aspe R, Seron P. Effectiveness of neuromuscular electrostimulation in COPD subjects on mechanical ventilation. A systematic review and meta-analysis. Clinics (Sao Paulo) 2022; 77:100108. [PMID: 36166993 PMCID: PMC9513212 DOI: 10.1016/j.clinsp.2022.100108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 08/20/2022] [Accepted: 08/29/2022] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE To estimate the effectiveness of Neuromuscular Electrostimulation (NMES) in adults with COPD undergoing MV. METHOD A sensitive search was performed in MEDLINE, Embase, CENTRAL, CINAHL and other resources. Randomized Controlled Clinical Trials (RCTs) or non-RCTs that enrolled adults with COPD on MV due to an exacerbation of their disease were included. Two independent reviewers screened, extracted information, and assessed the risk of bias (RoB 2 tool) and the certainty of evidence (GRADE approach) from the included studies. RESULTS Four RCTs (144 participants) were included. Subjects who underwent NMES were able to move from bed to chair independently in less time (MD = 4.98 days less; 95% CI -8.55 to -1.47; 2 RCTs; low certainty of the evidence) and they were fewer days on MV (MD = 2.89 days less; 95% CI -4.58 to -1.21); 3 RCTs; low certainty of the evidence) than the control group. However, the effect of NMES on muscle strength is unclear (very low certainty of the evidence). CONCLUSIONS NMES may improve functional independence and decrease MV time in adults with COPD; however, its effectiveness on muscle strength is uncertain. More and better RCTs are needed to determine with greater certainty the effectiveness of NMES in this population.
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Affiliation(s)
- Ruvistay Gutiérrez-Arias
- Physical Medicine and Rehabilitation Service, Critical Care Unit, Instituto Nacional del Tórax, Santiago, Chile; Exercise and Rehabilitation Sciences Institute, School of Physical Therapy, Faculty of Rehabilitation Sciences, Universidad Andres Bello, Santiago, Chile
| | - Yorschua Jalil
- Exercise and Rehabilitation Sciences Institute, School of Physical Therapy, Faculty of Rehabilitation Sciences, Universidad Andres Bello, Santiago, Chile; Departamento Ciencias de la Salud, Carrera de Kinesiología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile; Departamento Medicina Intensiva, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Rocío Fuentes-Aspe
- Departmento de Ciencias de la Rehabilitación & CIGES, Facultad de Medicina, Universidad de La Frontera, Temuco, Chile
| | - Pamela Seron
- Departmento de Ciencias de la Rehabilitación & CIGES, Facultad de Medicina, Universidad de La Frontera, Temuco, Chile.
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9
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Chen L, Ren SY, Li RX, Liu K, Chen JF, Yang YJ, Deng YB, Wang HZ, Xiao L, Mei F, Wang F. Chronic Exposure to Hypoxia Inhibits Myelinogenesis and Causes Motor Coordination Deficits in Adult Mice. Neurosci Bull 2021; 37:1397-1411. [PMID: 34292513 PMCID: PMC8490606 DOI: 10.1007/s12264-021-00745-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Accepted: 03/06/2021] [Indexed: 12/18/2022] Open
Abstract
Exposure to chronic hypoxia is considered to be a risk factor for deficits in brain function in adults, but the underlying mechanisms remain largely unknown. Since active myelinogenesis persists in the adult central nervous system, here we aimed to investigate the impact of chronic hypoxia on myelination and the related functional consequences in adult mice. Using a transgenic approach to label newly-generated myelin sheaths (NG2-CreERTM; Tau-mGFP), we found that myelinogenesis was highly active in most brain regions, such as the motor cortex and corpus callosum. After exposure to hypoxia (10% oxygen) 12 h per day for 4 weeks, myelinogenesis was largely inhibited in the 4-month old brain and the mice displayed motor coordination deficits revealed by the beam-walking test. To determine the relationship between the inhibited myelination and functional impairment, we induced oligodendroglia-specific deletion of the transcription factor Olig2 by tamoxifen (NG2-CreERTM; Tau-mGFP; Olig2 fl/fl) in adult mice to mimic the decreased myelinogenesis caused by hypoxia. The deletion of Olig2 inhibited myelinogenesis and consequently impaired motor coordination, suggesting that myelinogenesis is required for motor function in adult mice. To understand whether enhancing myelination could protect brain functions against hypoxia, we treated hypoxic mice with the myelination-enhancing drug-clemastine, which resulted in enhanced myelogenesis and improved motor coordination. Taken together, our data indicate that chronic hypoxia inhibits myelinogenesis and causes functional deficits in the brain and that enhancing myelinogenesis protects brain functions against hypoxia-related deficits.
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Affiliation(s)
- Lin Chen
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China
| | - Shu-Yu Ren
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China
| | - Rui-Xue Li
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China
| | - Kun Liu
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China
| | - Jing-Fei Chen
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China
| | - Yu-Jian Yang
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China
| | - Yong-Bin Deng
- Department of Neurosurgery, Chongqing Emergency Medical Center, Chongqing University, Chongqing, 400014, China
| | - Han-Zhi Wang
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China
| | - Lan Xiao
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China
| | - Feng Mei
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China.
| | - Fei Wang
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China.
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10
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Sharma A, Ahmad S, Ahmad T, Ali S, Syed MA. Mitochondrial dynamics and mitophagy in lung disorders. Life Sci 2021; 284:119876. [PMID: 34389405 DOI: 10.1016/j.lfs.2021.119876] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 08/02/2021] [Accepted: 08/03/2021] [Indexed: 12/13/2022]
Abstract
Mitochondria are biosynthetic, bioenergetic, and signaling organelles which are critical for physiological adaptations and cellular stress responses to the environment. Various endogenous and environmental stress affects critical processes in mitochondrial homeostasis such as oxidative phosphorylation, biogenesis, mitochondrial redox system which leads to the formation of reactive oxygen species (ROS) and free radicals. The state of function of the mitochondrion is particularly dependent on the dynamic balance between mitochondrial biogenesis, fusion and fission, and degradation of damaged mitochondria by mitophagy. Increasing evidence has suggested a prominent role of mitochondrial dysfunction in the onset and progression of various lung pathologies, ranging from acute to chronic disorders. In this comprehensive review, we discuss the emerging findings of multifaceted regulations of mitochondrial dynamics and mitophagy in normal lung homeostasis as well as the prominence of mitochondrial dysfunction as a determining factor in different lung disorders such as lung cancer, COPD, IPF, ALI/ARDS, BPD, and asthma. The review will contribute to the existing understanding of critical molecular machinery regulating mitochondrial dynamic state during these pathological states. Furthermore, we have also highlighted various molecular checkpoints involved in mitochondrial dynamics, which may serve as hopeful therapeutic targets for the development of potential therapies for these lung disorders.
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Affiliation(s)
- Archana Sharma
- Translational Research Lab, Department of Biotechnology, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Shaniya Ahmad
- Translational Research Lab, Department of Biotechnology, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Tanveer Ahmad
- Multidisciplinary Centre for Advance Research and Studies, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Shakir Ali
- Department of Biochemistry, School of Chemical and Life Sciences, Jamia Hamdard, New Delhi, India
| | - Mansoor Ali Syed
- Translational Research Lab, Department of Biotechnology, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi 110025, India.
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11
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Udhaya Kumar S, Madhana Priya N, Thirumal Kumar D, Anu Preethi V, Kumar V, Nagarajan D, Magesh R, Younes S, Zayed H, George Priya Doss C. An integrative analysis to distinguish between emphysema (EML) and alpha-1 antitrypsin deficiency-related emphysema (ADL)-A systems biology approach. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2021; 127:315-342. [PMID: 34340772 DOI: 10.1016/bs.apcsb.2021.02.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Lung Emphysema is an abnormal enlargement of the air sacs followed by the destruction of alveolar walls without any prominent fibrosis. This study primarily identifies the differentially expressed genes (DEGs), interactions between them, and their significant involvement in the activated signaling cascades. The dataset with ID GSE1122 (five normal lung tissue samples, five of usual emphysema, and five of alpha-1 antitrypsin deficiency-related emphysema) from the gene expression omnibus (GEO) was analyzed using the GEO2R tool. The physical association between the DEGs were mapped using the STRING tool and was visualized in the Cytoscape software. The enriched functional processes were identified with the ClueGO plugin's help from Cytoscape. Further integrative functional annotation was performed by implying the GeneGo Metacore™ to distinguish the enriched pathway maps, process networks, and GO processes. The results from this analysis revealed the critical signaling cascades that have been either activated or inhibited due to identified DEGs. We found the activated pathways such as immune response IL-1 signaling pathway, positive regulation of smooth muscle migration, BMP signaling pathway, positive regulation of leukocyte migration, NIK/NF-kappB signaling, and cytochrome-c oxidase activity. Finally, we mapped four crucial genes (CCL5, ALK, TAC1, CD74, and HLA-DOA) by comparing the functional annotations that could be significantly influential in emphysema molecular pathogenesis. Our study provides insights into the pathogenesis of emphysema and helps in developing potential drug targets against emphysema.
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Affiliation(s)
- S Udhaya Kumar
- School of BioSciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - N Madhana Priya
- Department of Biotechnology, Sri Ramachandra Institute of Higher Education and Research (DU), Porur, Chennai, Tamil Nadu, India
| | - D Thirumal Kumar
- Meenakshi Academy of Higher Education and Research, Chennai, Tamil Nadu, India
| | - V Anu Preethi
- School of Computer Science and Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - Vibhaa Kumar
- School of BioSciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - Dhanushya Nagarajan
- School of BioSciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - R Magesh
- Department of Biotechnology, Sri Ramachandra Institute of Higher Education and Research (DU), Porur, Chennai, Tamil Nadu, India
| | - Salma Younes
- Department of Biomedical Sciences, College of Health and Sciences, QU Health, Qatar University, Doha, Qatar
| | - Hatem Zayed
- Department of Biomedical Sciences, College of Health and Sciences, QU Health, Qatar University, Doha, Qatar
| | - C George Priya Doss
- School of BioSciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, India.
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12
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Adami A, Corvino RB, Calmelat RA, Porszasz J, Casaburi R, Rossiter HB. Muscle Oxidative Capacity Is Reduced in Both Upper and Lower Limbs in COPD. Med Sci Sports Exerc 2021; 52:2061-2068. [PMID: 32282451 PMCID: PMC7497478 DOI: 10.1249/mss.0000000000002364] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
INTRODUCTION Skeletal muscle atrophy, weakness, mitochondrial loss, and dysfunction are characteristics of chronic obstructive pulmonary disease (COPD). It remains unclear whether muscle dysfunction occurs in both upper and lower limbs, because findings are inconsistent in the few studies where upper and lower limb muscle performance properties were compared within an individual. This study determined whether muscle oxidative capacity is low in upper and lower limbs of COPD patients compared with controls. METHODS Oxidative capacity of the forearm and medial gastrocnemius was measured using near-infrared spectroscopy to determine the muscle O2 consumption recovery rate constant (k, min) in 20 COPD (Global Initiative for Chronic Obstructive Lung Disease (GOLD) 2/3/4, n = 7/7/6) and 20 smokers with normal spirometry (CON). Muscle k is linearly proportional to oxidative capacity. Steps per day and vector magnitude units per minute (VMU·min) were assessed using triaxial accelerometry. Differences between group and limb were assessed by two-way ANOVA. RESULTS There was a significant main effect of group (F = 11.2, ηp = 0.13, P = 0.001): k was lower in both upper and lower limb muscles in COPD (1.01 ± 0.17 and 1.05 ± 0.24 min) compared with CON (1.29 ± 0.49 and 1.54 ± 0.60 min). There was no effect on k of limb (F = 1.8, ηp = 0.02, P = 0.18) or group-limb interaction (P = 0.35). (VMU·min) was significantly lower in COPD (-38%; P = 0.042). Steps per day did not differ between COPD (4738 ± 3194) and CON (6372 ± 2107; P = 0.286), although the difference exceeded a clinically important threshold (>600-1100 steps per day). CONCLUSIONS Compared with CON, muscle oxidative capacity was lower in COPD in both upper (-20%) and lower (-30%) limbs. These data suggest that mitochondrial loss in COPD is not isolated to locomotor muscles.
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Affiliation(s)
| | | | - Robert A Calmelat
- Rehabilitation Clinical Trials Center, Division of Respiratory and Critical Care Physiology and Medicine, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA
| | - Janos Porszasz
- Rehabilitation Clinical Trials Center, Division of Respiratory and Critical Care Physiology and Medicine, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA
| | - Richard Casaburi
- Rehabilitation Clinical Trials Center, Division of Respiratory and Critical Care Physiology and Medicine, The Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA
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13
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Mao J, Li Y, Feng S, Liu X, Tian Y, Bian Q, Li J, Hu Y, Zhang L, Ji H, Li S. Bufei Jianpi Formula Improves Mitochondrial Function and Suppresses Mitophagy in Skeletal Muscle via the Adenosine Monophosphate-Activated Protein Kinase Pathway in Chronic Obstructive Pulmonary Disease. Front Pharmacol 2021; 11:587176. [PMID: 33390958 PMCID: PMC7773703 DOI: 10.3389/fphar.2020.587176] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 11/24/2020] [Indexed: 12/18/2022] Open
Abstract
Skeletal muscle dysfunction, a striking systemic comorbidity of chronic obstructive pulmonary disease (COPD), is associated with declines in activities of daily living, reductions in health status and prognosis, and increases in mortality. Bufei Jianpi formula (BJF), a traditional Chinese herbal formulation, has been shown to improve skeletal muscle tension and tolerance via inhibition of cellular apoptosis in COPD rat models. This study aimed to investigate the mechanisms by which BJF regulates the adenosine monophosphate-activated protein kinase (AMPK) pathway to improve mitochondrial function and to suppress mitophagy in skeletal muscle cells. Our study showed that BJF repaired lung function and ameliorated pathological impairment in rat lung and skeletal muscle tissues. BJF also improved mitochondrial function and reduced mitophagy via the AMPK signaling pathway in rat skeletal muscle tissue. In vitro, BJF significantly improved cigarette smoke extract-induced mitochondrial functional impairment in L6 skeletal muscle cells through effects on mitochondrial membrane potential, mitochondrial permeability transition pores, adenosine triphosphate production, and mitochondrial respiration. In addition, BJF led to upregulated expression of mitochondrial biogenesis markers, including AMPK-α, PGC-1α, and TFAM and downregulation of mitophagy markers, including LC3B, ULK1, PINK1, and Parkin, with increased expression of downstream markers of the AMPK pathway, including mTOR, PPARγ, and SIRT1. In conclusion, BJF significantly improved skeletal muscle and mitochondrial function in COPD rats and L6 cells by promoting mitochondrial biogenesis and suppressing mitophagy via the AMPK pathway. This study suggests that BJF may have therapeutic potential for prophylaxis and treatment of skeletal muscle dysfunction in patients with COPD.
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Affiliation(s)
- Jing Mao
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou, China.,Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China
| | - Ya Li
- Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Institute for Respiratory Diseases, The First Affiliated Hospital, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
| | - Suxiang Feng
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou, China.,Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
| | - Xuefang Liu
- Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
| | - Yange Tian
- Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
| | - Qingqing Bian
- Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Institute for Respiratory Diseases, The First Affiliated Hospital, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
| | - Junzi Li
- Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
| | - Yuanyuan Hu
- Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
| | - Lanxi Zhang
- Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
| | - Huige Ji
- Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
| | - Suyun Li
- Henan Key Laboratory of Chinese Medicine for Respiratory Disease, Henan University of Chinese Medicine, Zhengzhou, China.,Institute for Respiratory Diseases, The First Affiliated Hospital, Henan University of Chinese Medicine, Zhengzhou, China.,Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Disease by Henan and Education Ministry of P.R. China, Henan University of Chinese Medicine, Zhengzhou, China
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14
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Miyamoto A, Asai K, Kadotani H, Maruyama N, Kubo H, Okamoto A, Sato K, Yamada K, Ijiri N, Watanabe T, Kawaguchi T. Ninjin'yoeito Ameliorates Skeletal Muscle Complications in COPD Model Mice by Upregulating Peroxisome Proliferator-Activated Receptor γ Coactivator-1α Expression. Int J Chron Obstruct Pulmon Dis 2020; 15:3063-3077. [PMID: 33273811 PMCID: PMC7708308 DOI: 10.2147/copd.s280401] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 11/09/2020] [Indexed: 12/19/2022] Open
Abstract
Purpose Sarcopenia, the loss of skeletal muscle mass and strength, is a common systemic consequence of chronic obstructive pulmonary disease (COPD) and is correlated with higher mortality. Ninjin’yoeito (NYT) is a Japanese herbal medicine used to treat athrepsia and anorexia and is reported to ameliorate weight loss and muscular dysfunction. Recent studies have shown that its crude components upregulate the peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α)-related pathway, which is involved in skeletal muscle functions. Here, we examined whether NYT improves skeletal muscle complications by upregulating PGC-1α in COPD model mice. Materials and Methods Mice were divided into four groups: control, NYT, smoking, and smoking + NYT. The smoking and smoking + NYT groups were exposed to cigarette smoke for 60 min once daily. The mice in the NYT and smoking + NYT groups were fed an NYT-containing diet (3% w/w). We performed cellular analysis of bronchoalveolar lavage fluid, assessed pulmonary morphological changes, examined the expression of PGC-1α mRNA and protein in the gastrocnemius and soleus muscle, measured the hindlimb muscle volume with micro-computed tomography, and determined the myofiber proportion in soleus muscle after 12 weeks. Results Cigarette smoke exposure resulted in reduced skeletal muscle volume and slow-twitch muscle fibers and development of pulmonary emphysema. NYT feeding induced partial recovery of the damaged alveolar wall; however, NYT did not ameliorate smoke-induced alveolar enlargement. These findings revealed that NYT did not have sufficient efficacy in suppressing pulmonary emphysema. On the other hand, PGC-1α expression in muscle tissue of the NYT-fed mice increased significantly, resulting in suppression of smoke-induced loss of muscle mass and alteration in the muscle fiber distribution. Conclusion NYT increases PGC-1α expression in the muscle of COPD model mice and is involved in suppressing cigarette smoke-induced muscle complications. NYT may be a novel preventive and therapeutic medication for muscular dysfunctions in COPD.
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Affiliation(s)
- Atsushi Miyamoto
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Kazuhisa Asai
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Hideaki Kadotani
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Naomi Maruyama
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Hiroaki Kubo
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Atsuko Okamoto
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Kanako Sato
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Kazuhiro Yamada
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Naoki Ijiri
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Tetsuya Watanabe
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
| | - Tomoya Kawaguchi
- Department of Respiratory Medicine, Graduate School of Medicine, Osaka City University, Osaka-City, Osaka, Japan
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15
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Cloonan SM, Kim K, Esteves P, Trian T, Barnes PJ. Mitochondrial dysfunction in lung ageing and disease. Eur Respir Rev 2020; 29:29/157/200165. [PMID: 33060165 DOI: 10.1183/16000617.0165-2020] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 09/25/2020] [Indexed: 12/12/2022] Open
Abstract
Mitochondrial biology has seen a surge in popularity in the past 5 years, with the emergence of numerous new avenues of exciting mitochondria-related research including immunometabolism, mitochondrial transplantation and mitochondria-microbe biology. Since the early 1960s mitochondrial dysfunction has been observed in cells of the lung in individuals and in experimental models of chronic and acute respiratory diseases. However, it is only in the past decade with the emergence of more sophisticated tools and methodologies that we are beginning to understand how this enigmatic organelle regulates cellular homeostasis and contributes to disease processes in the lung. In this review, we highlight the diverse role of mitochondria in individual lung cell populations and what happens when these essential organelles become dysfunctional with ageing and in acute and chronic lung disease. Although much remains to be uncovered, we also discuss potential targeted therapeutics for mitochondrial dysfunction in the ageing and diseased lung.
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Affiliation(s)
- Suzanne M Cloonan
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Dept of Medicine, New York, NY, USA.,School of Medicine, Trinity College Dublin and Tallaght University Hospital, Dublin, Ireland
| | - Kihwan Kim
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Dept of Medicine, New York, NY, USA
| | - Pauline Esteves
- Univ-Bordeaux, Centre de Recherche Cardio-thoracique de Bordeaux, U1045, Dépt de Pharmacologie, CIC 1401, Bordeaux, France.,INSERM, Centre de Recherche Cardio-thoracique de Bordeaux, U1045, CIC 1401, Bordeaux, France
| | - Thomas Trian
- Univ-Bordeaux, Centre de Recherche Cardio-thoracique de Bordeaux, U1045, Dépt de Pharmacologie, CIC 1401, Bordeaux, France.,INSERM, Centre de Recherche Cardio-thoracique de Bordeaux, U1045, CIC 1401, Bordeaux, France
| | - Peter J Barnes
- National Heart and Lung Institute, Imperial College, London, UK
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16
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Chemerin: A Potential Regulator of Inflammation and Metabolism for Chronic Obstructive Pulmonary Disease and Pulmonary Rehabilitation. BIOMED RESEARCH INTERNATIONAL 2020; 2020:4574509. [PMID: 32337250 PMCID: PMC7166297 DOI: 10.1155/2020/4574509] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 03/05/2020] [Accepted: 03/23/2020] [Indexed: 01/09/2023]
Abstract
Chronic obstructive pulmonary disease (COPD) features chronic inflammatory reactions of both intra- and extrapulmonary nature. Moreover, COPD is associated with abnormal glucose and lipid metabolism in patients, which influences the prognosis and chronicity of this disease. Abnormal glucose and lipid metabolism are also closely related to inflammation processes. Further insights into the interactions of inflammation and glucose and lipid metabolism might therefore inspire novel therapeutic interventions to promote lung rehabilitation. Chemerin, as a recently discovered adipokine, has been shown to play a role in inflammatory response and glucose and lipid metabolism in many diseases (including COPD). Chemerin recruits inflammatory cells to sites of inflammation during the early stages of COPD, leading to endothelial barrier dysfunction, early vascular remodeling, and angiogenesis. Moreover, it supports the recruitment of antigen-presenting cells that guide immune cells as part of the body's inflammatory responses. Chemerin also regulates metabolism via activation of its cognate receptors. Glucose homeostasis is affected via effects on insulin secretion and sensitivity, and lipid metabolism is changed by increased transformation of preadipocytes to mature adipocytes through chemerin-binding receptors. Controlling chemerin signaling may be a promising approach to improve various aspects of COPD-related dysfunction. Importantly, several studies indicate that chemerin expression in vivo is influenced by exercise. Although available evidence is still limited, therapeutic alterations of chemerin activity may be a promising target of therapeutic approaches aimed at the rehabilitation of COPD patients based on exercises. In conclusion, chemerin plays an essential role in COPD, especially in the inflammatory responses and metabolism, and has a potential to become a target for, and a biomarker of, curative mechanisms underlying exercise-mediated lung rehabilitation.
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17
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Marillier M, Bernard AC, Vergès S, Neder JA. Locomotor Muscles in COPD: The Rationale for Rehabilitative Exercise Training. Front Physiol 2020; 10:1590. [PMID: 31992992 PMCID: PMC6971045 DOI: 10.3389/fphys.2019.01590] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 12/19/2019] [Indexed: 12/28/2022] Open
Abstract
Exercise training as part of pulmonary rehabilitation is arguably the most effective intervention to improve tolerance to physical exertion in patients with chronic obstructive pulmonary disease (COPD). Owing to the fact that exercise training has modest effects on exertional ventilation, operating lung volumes and respiratory muscle performance, improving locomotor muscle structure and function are key targets for pulmonary rehabilitation in COPD. In the current concise review, we initially discuss whether patients’ muscles are exposed to deleterious factors. After presenting corroboratory evidence on this regard (e.g., oxidative stress, inflammation, hypoxemia, inactivity, and medications), we outline their effects on muscle macro- and micro-structure and related functional properties. We then finalize by addressing the potential beneficial consequences of different training strategies on these muscle-centered outcomes. This review provides, therefore, an up-to-date outline of the rationale for rehabilitative exercise training approaches focusing on the locomotor muscles in this patient population.
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Affiliation(s)
- Mathieu Marillier
- Laboratory of Clinical Exercise Physiology, Kingston General Hospital, Queen's University, Kingston, ON, Canada
| | - Anne-Catherine Bernard
- Laboratory of Clinical Exercise Physiology, Kingston General Hospital, Queen's University, Kingston, ON, Canada
| | - Samuel Vergès
- HP2 Laboratory, INSERM, CHU Grenoble Alpes, Grenoble Alpes University, Grenoble, France
| | - J Alberto Neder
- Laboratory of Clinical Exercise Physiology, Kingston General Hospital, Queen's University, Kingston, ON, Canada
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18
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Wen W, Yu G, Liu W, Gu L, Chu J, Zhou X, Liu Y, Lai G. Silencing FUNDC1 alleviates chronic obstructive pulmonary disease by inhibiting mitochondrial autophagy and bronchial epithelium cell apoptosis under hypoxic environment. J Cell Biochem 2019; 120:17602-17615. [PMID: 31237014 DOI: 10.1002/jcb.29028] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 04/22/2019] [Accepted: 04/29/2019] [Indexed: 12/20/2022]
Abstract
Chronic obstructive pulmonary disease (COPD) is a major global epidemic with increasing incidence worldwide. The pathogenesis of COPD is involved with mitochondrial autophagy. Recently, it has been reported that FUN14 domain containing 1 (FUNDC1) is a mediator of mitochondrial autophagy. Therefore, we hypothesized that FUNDC1 was involved in cigarette smoke (CS)-induced COPD progression by regulating mitochondrial autophagy. In vitro cigarette smoke extract (CSE)-treated human bronchial epithelial cell (hBEC) Beas-2B cell line and in vivo CS-induced COPD mouse models were developed, in which FUNDC1 expression was measured. Next, whether FUNDC1 interacted with dynamin-related protein 1 (DRP1) in COPD was investigated. The functional mechanism of FUNDC1 in COPD was evaluated through gain- or loss-of-function studies. Then, pulmonary function, mitochondrial transmembrane potential (MTP) and mucociliary clearance (MCC) were examined. Levels of interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) and expression of autophagy-specific markers (light chain 3 [LC3] II, LC3 I, and Tom20) were measured. Finally, apoptosis and mitochondrial autophagy were assessed. FUNDC1 was highly expressed in CSE-treated hBECs and COPD mice. Meanwhile, FUNDC1 was proved to interact with DRP1 in CSE-treated cells. Moreover, in CSE-treated hBECs, silencing FUNDC1 was observed to reduce levels of IL-6 and TNF-α, and MTP but increase MCC, and inhibit CSE-induced mitochondrial autophagy and Beas-2B cell apoptosis, which was consistent with the trend in COPD mouse models. In addition, pulmonary function of COPD mouse models was increased in response to FUNDC1 silencing. Finally, silencing of DRP1 also inhibited mitochondrial autophagy and Beas-2B cell apoptosis. Collectively, FUNDC1 silencing could suppress the progression of COPD by inhibiting mitochondrial autophagy and hBEC apoptosis through interaction with DRP1, highlighting a potential therapeutic target for COPD treatment.
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Affiliation(s)
- Wen Wen
- Department of Respiratory and Critical Care Medicine, Fuzhou General Hospital of Fujian Medical University, Dongfang Hospital of Xiamen University, 900th Hospital of the Joint Logistics Support Force, Fuzhou, P.R. China
| | - Guoqing Yu
- Department of Respiratory and Critical Care Medicine, Fuzhou General Hospital of Fujian Medical University, Dongfang Hospital of Xiamen University, 900th Hospital of the Joint Logistics Support Force, Fuzhou, P.R. China
| | - Wei Liu
- Department of Respiratory and Critical Care Medicine, Fuzhou General Hospital of Fujian Medical University, Dongfang Hospital of Xiamen University, 900th Hospital of the Joint Logistics Support Force, Fuzhou, P.R. China
| | - Lei Gu
- Department of Respiratory and Critical Care Medicine, Fuzhou General Hospital of Fujian Medical University, Dongfang Hospital of Xiamen University, 900th Hospital of the Joint Logistics Support Force, Fuzhou, P.R. China
| | - Jiahui Chu
- Department of Respiratory and Critical Care Medicine, Fuzhou General Hospital of Fujian Medical University, Dongfang Hospital of Xiamen University, 900th Hospital of the Joint Logistics Support Force, Fuzhou, P.R. China
| | - Xiao Zhou
- Department of Respiratory and Critical Care Medicine, Fuzhou General Hospital of Fujian Medical University, Dongfang Hospital of Xiamen University, 900th Hospital of the Joint Logistics Support Force, Fuzhou, P.R. China
| | - Yuebin Liu
- Department of Respiratory and Critical Care Medicine, Fuzhou General Hospital of Fujian Medical University, Dongfang Hospital of Xiamen University, 900th Hospital of the Joint Logistics Support Force, Fuzhou, P.R. China
| | - Guoxiang Lai
- Department of Respiratory and Critical Care Medicine, Fuzhou General Hospital of Fujian Medical University, Dongfang Hospital of Xiamen University, 900th Hospital of the Joint Logistics Support Force, Fuzhou, P.R. China
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19
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Abrigo J, Simon F, Cabrera D, Vilos C, Cabello-Verrugio C. Mitochondrial Dysfunction in Skeletal Muscle Pathologies. Curr Protein Pept Sci 2019; 20:536-546. [PMID: 30947668 DOI: 10.2174/1389203720666190402100902] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 03/20/2019] [Accepted: 03/21/2019] [Indexed: 12/26/2022]
Abstract
Several molecular mechanisms are involved in the regulation of skeletal muscle function. Among them, mitochondrial activity can be identified. The mitochondria is an important and essential organelle in the skeletal muscle that is involved in metabolic regulation and ATP production, which are two key elements of muscle contractibility and plasticity. Thus, in this review, we present the critical and recent antecedents regarding the mechanisms through which mitochondrial dysfunction can be involved in the generation and development of skeletal muscle pathologies, its contribution to detrimental functioning in skeletal muscle and its crosstalk with other typical signaling pathways related to muscle diseases. In addition, an update on the development of new strategies with therapeutic potential to inhibit the deleterious impact of mitochondrial dysfunction in skeletal muscle is discussed.
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Affiliation(s)
- Johanna Abrigo
- Laboratory of Muscle Pathology, Fragility and Aging, Departamento de Ciencias Biologicas, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile.,Millennium Institute on Immunology and Immunotherapy, Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
| | - Felipe Simon
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile.,Laboratory of Integrative Physiopathology, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Daniel Cabrera
- Departamento de Gastroenterologia, Facultad de Medicina, Pontificia Universidad Catolica de Chile, Santiago, Chile.,Departamento de Ciencias Químicas y Biológicas, Facultad de Salud, Universidad Bernardo O Higgins, Santiago, Chile
| | - Cristian Vilos
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile.,Laboratory of Nanomedicine and Targeted Delivery, Center for Medical Research, School of Medicine. Universidad d e Talca, Talca, Chile
| | - Claudio Cabello-Verrugio
- Laboratory of Muscle Pathology, Fragility and Aging, Departamento de Ciencias Biologicas, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile.,Millennium Institute on Immunology and Immunotherapy, Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Universidad de Santiago de Chile, Santiago, Chile
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20
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The Relevance of Limb Muscle Dysfunction in Chronic Obstructive Pulmonary Disease. Clin Chest Med 2019; 40:367-383. [DOI: 10.1016/j.ccm.2019.02.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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21
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Neder JA, Marillier M, Bernard AC, James MD, Milne KM, O’Donnell DE. The Integrative Physiology of Exercise Training in Patients with COPD. COPD 2019; 16:182-195. [DOI: 10.1080/15412555.2019.1606189] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- J. Alberto Neder
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Division of Respirology, Department of Medicine, Kingston Health Science Center and Queen’s University, Kingston, Ontario, Canada
| | - Mathieu Marillier
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Division of Respirology, Department of Medicine, Kingston Health Science Center and Queen’s University, Kingston, Ontario, Canada
| | - Anne-Catherine Bernard
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Division of Respirology, Department of Medicine, Kingston Health Science Center and Queen’s University, Kingston, Ontario, Canada
| | - Matthew D. James
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Division of Respirology, Department of Medicine, Kingston Health Science Center and Queen’s University, Kingston, Ontario, Canada
| | - Kathryn M. Milne
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Division of Respirology, Department of Medicine, Kingston Health Science Center and Queen’s University, Kingston, Ontario, Canada
- Clinician Investigator Program, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Denis E. O’Donnell
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Division of Respirology, Department of Medicine, Kingston Health Science Center and Queen’s University, Kingston, Ontario, Canada
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22
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Shi K, Chen X, Xie B, Yang SS, Liu D, Dai G, Chen Q. Celastrol Alleviates Chronic Obstructive Pulmonary Disease by Inhibiting Cellular Inflammation Induced by Cigarette Smoke via the Ednrb/Kng1 Signaling Pathway. Front Pharmacol 2018; 9:1276. [PMID: 30498444 PMCID: PMC6249343 DOI: 10.3389/fphar.2018.01276] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 10/18/2018] [Indexed: 12/14/2022] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a debilitating disease caused by chronic exposure to cigarette smoke (CS). Celastrol is a pentacyclic triterpenoid compound exhibits potent antioxidant and anti-inflammatory activities. Also it is presently known to protect against liver damage induced by type II diabetes. However, its role in COPD is unclear. In this study, we investigated the effects of Celastrol on cellular inflammation in mice exposed to CS and Beas-2B cells treated with CS extract (CSE). C57BL/6 mice and Beas-2B cells were randomly divided into three groups: control group, COPD or CSE group, and Celastrol treatment group. The COPD mice models were subjected to smoke exposure and cell models were treated with CSE. Bioinformatics analysis was performed to identify differentially expressed genes following treatment with Celastrol in COPD, the molecular networks was mapped by Cytoscape. The levels of inflammatory cytokinesinterleukin-8, tumor necrosis factor α, monocyte chemoattractant protein-1, and oxidative stress factors superoxide dismutase and catalase were measured by enzyme-linked immunosorbent assay. Hematoxylin and eosin staining to detect the injury of mouse lung tissue. mRNA and protein levels of Ednrb and Kng1 in the tissues and cells were measured by quantitative polymerase chain reaction (PCR) and western blotting, respectively. Apoptosis was measured by flow cytometry and TUNEL staining. Compared to mice in the COPD group, mice treated with Celastrol had significantly reduced levels of inflammatory cytokines interleukin-8, tumor necrosis factor α and monocyte chemoattractant protein-1 in the serum and bronchoalveolar lavage fluid, and significantly increased levels of oxidative stress factors superoxide dismutase and catalase. The same results were obtained at the cellular level using Beas-2B cells. Compared to the model groups, Celastrol reduced lung injury in mice and significantly reduced cellular apoptosis. Bioinformatics analysis showed that Ednrb is a target gene of Celastrol and differentially expressed in COPD. Quantitative PCR analysis showed that Ednrb expression in patients with COPD was significantly increased compared to that in healthy controls. Additionally, Celastrol effectively reduced Ednrb/Kng1 expression in both cell and animal models. Celastrol has a therapeutic effect on COPD and may alleviate COPD by inhibiting inflammation development by suppressing the Ednrb/Kng1 signaling pathway.
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Affiliation(s)
- Ke Shi
- Department of Geriatrics, Xiangya Hospital of Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Xi Chen
- Respiratory Medicine, Xiangya Hospital of Central South University, Changsha, China
| | - Bin Xie
- Department of Geriatrics, Xiangya Hospital of Central South University, Changsha, China
| | - Sha Sha Yang
- Department of Geriatrics, Xiangya Hospital of Central South University, Changsha, China
| | - Da Liu
- Department of Geriatrics, Xiangya Hospital of Central South University, Changsha, China
| | - Gan Dai
- Department of Microbiology, Xiangya School of Medicine, Central South University, Changsha, China
| | - Qiong Chen
- Department of Geriatrics, Xiangya Hospital of Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
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23
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Leermakers PA, Schols AMWJ, Kneppers AEM, Kelders MCJM, de Theije CC, Lainscak M, Gosker HR. Molecular signalling towards mitochondrial breakdown is enhanced in skeletal muscle of patients with chronic obstructive pulmonary disease (COPD). Sci Rep 2018; 8:15007. [PMID: 30302028 PMCID: PMC6177478 DOI: 10.1038/s41598-018-33471-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 09/27/2018] [Indexed: 11/09/2022] Open
Abstract
Loss of skeletal muscle mitochondrial oxidative capacity is well-established in patients with COPD, but the role of mitochondrial breakdown herein is largely unexplored. Currently, we studied if mitochondrial breakdown signalling is increased in skeletal muscle of COPD patients and associates with the loss of mitochondrial content, and whether it is affected in patients with iron deficiency (ID) or systemic inflammation. Therefore, mitophagy, autophagy, mitochondrial dynamics and content markers were analysed in vastus lateralis biopsies of COPD patients (N = 95, FEV1% predicted: 39.0 [31.0–53.6]) and healthy controls (N = 15, FEV1% predicted: 112.8 [107.5–125.5]). Sub-analyses were performed on patients stratified by ID or C-reactive protein (CRP). Compared with controls, COPD patients had lower muscle mitochondrial content, higher BNIP3L and lower FUNDC1 protein, and higher Parkin protein and gene-expression. BNIP3L and Parkin protein levels inversely correlated with mtDNA/gDNA ratio and FEV1% predicted. ID-COPD patients had lower BNIP3L protein and higher BNIP3 gene-expression, while high CRP patients had higher BNIP3 and autophagy-related protein levels. In conclusion, our data indicates that mitochondrial breakdown signalling is increased in skeletal muscle of COPD patients, and is related to disease severity and loss of mitochondrial content. Moreover, systemic inflammation is associated with higher BNIP3 and autophagy-related protein levels.
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Affiliation(s)
- P A Leermakers
- Department of Respiratory Medicine, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands.
| | - A M W J Schols
- Department of Respiratory Medicine, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - A E M Kneppers
- Department of Respiratory Medicine, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - M C J M Kelders
- Department of Respiratory Medicine, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - C C de Theije
- Department of Respiratory Medicine, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - M Lainscak
- Department of Cardiology, General Hospital Murska Sobota, Murska Sobota, Slovenia.,Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - H R Gosker
- Department of Respiratory Medicine, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands
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24
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Moezy A, Erfani A, Mazaherinezhad A, Mousavi SAJ. Downhill walking influence on physical condition and quality of life in patients with COPD: A randomized controlled trial. Med J Islam Repub Iran 2018; 32:49. [PMID: 30159300 PMCID: PMC6108258 DOI: 10.14196/mjiri.32.49] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Indexed: 11/23/2022] Open
Abstract
Background: Chronic Obstructive Pulmonary Disease (COPD), in addition to its respiratory problems, is accompanied by several musculoskeletal consequences. The aim of this study is to investigate the effectiveness of eccentric exercise in the form of downhill walking (DW) on respiratory capacity, physical function and quality of life (QOL) in patients with COPD. Methods: The randomized controlled trial was carried out during 2014 - 2015 in Hazrat-e-Rasool Hospital in Tehran, Iran. The study design was as an assessor blind RCT on 32 patients with COPD that randomly assigned to the eccentric training (ET) and control (CON) groups. Patients in ET group received a 12-week DW exercise on the treadmill while the patients in the control group were only treated by COPD conventional medications and walked on paved surfaces. Functional tests, FEV1, FEV1 to FVC and St. George's Respiratory Questionnaire (SGRQ) were used to assess the subject's physical status and QOL pre and post-intervention. Results: The FEV1 (p=0.008), FEV1/FVC (p=0.002), six-minute walk test (p=0.029), timed up & go test (p=0.023), SGRQ symptom (p=0.022), SGRQ activity (p=0.007), SGRQ impact (p=0.033) and total score of SGRQ (p=0.013) improved significantly in the ET group compare to the CON group. Conclusion: DW could have positive influence on physical status and QOL of patients with COPD.
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Affiliation(s)
- Azar Moezy
- Department of Sports Medicine, Hazrat Rasool Hospital, Iran University of Medical Sciences, Tehran, Iran
| | | | - Ali Mazaherinezhad
- Department of Sports Medicine, Hazrat Rasool Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Seyed Ali Javad Mousavi
- Department of Internal Medicine, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
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25
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Gifford JR, Trinity JD, Kwon OS, Layec G, Garten RS, Park SY, Nelson AD, Richardson RS. Altered skeletal muscle mitochondrial phenotype in COPD: disease vs. disuse. J Appl Physiol (1985) 2018; 124:1045-1053. [PMID: 29357496 PMCID: PMC5972462 DOI: 10.1152/japplphysiol.00788.2017] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 12/20/2017] [Accepted: 12/20/2017] [Indexed: 11/22/2022] Open
Abstract
Patients with chronic obstructive pulmonary disease (COPD) exhibit an altered skeletal muscle mitochondrial phenotype, which often includes reduced mitochondrial density, altered respiratory function, and elevated oxidative stress. As this phenotype may be explained by the sedentary lifestyle that commonly accompanies this disease, the aim of this study was to determine whether such alterations are still evident when patients with COPD are compared to control subjects matched for objectively measured physical activity (PA; accelerometry). Indexes of mitochondrial density [citrate synthase (CS) activity], respiratory function (respirometry in permeabilized fibers), and muscle oxidative stress [4-hydroxynonenal (4-HNE) content] were assessed in muscle fibers biopsied from the vastus lateralis of nine patients with COPD and nine PA-matched control subjects (CON). Despite performing similar levels of PA (CON: 18 ± 3, COPD: 20 ± 7 daily minutes moderate-to-vigorous PA; CON: 4,596 ± 683, COPD: 4,219 ± 763 steps per day, P > 0.70), patients with COPD still exhibited several alterations in their mitochondrial phenotype, including attenuated skeletal muscle mitochondrial density (CS activity; CON 70.6 ± 3.8, COPD 52.7 ± 6.5 U/mg, P < 0.05), altered mitochondrial respiration [e.g., ratio of complex I-driven state 3 to complex II-driven state 3 (CI/CII); CON: 1.20 ± 0.11, COPD: 0.90 ± 0.05, P < 0.05), and oxidative stress (4-HNE; CON: 1.35 ± 0.19, COPD: 2.26 ± 0.25 relative to β-actin, P < 0.05). Furthermore, CS activity ( r = 0.55), CI/CII ( r = 0.60), and 4-HNE ( r = 0.49) were all correlated with pulmonary function, assessed as forced expiratory volume in 1 s ( P < 0.05), but not PA ( P > 0.05). In conclusion, the altered mitochondrial phenotype in COPD is present even in the absence of differing levels of PA and appears to be related to the disease itself. NEW & NOTEWORTHY Chronic obstructive pulmonary disease (COPD) is associated with debilitating alterations in the function of skeletal muscle mitochondria. By comparing the mitochondrial phenotype of patients with COPD to that of healthy control subjects who perform the same amount of physical activity each day, this study provides evidence that many aspects of the dysfunctional mitochondrial phenotype observed in COPD are not merely due to reduced physical activity but are likely related to the disease itself.
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Affiliation(s)
- Jayson R Gifford
- Department of Exercise Sciences, Brigham Young University , Provo, Utah
- Geriatric Research, Education, and Clinical Center, Salt Lake City Department of Veterans Medical Center , Salt Lake City, Utah
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Joel D Trinity
- Geriatric Research, Education, and Clinical Center, Salt Lake City Department of Veterans Medical Center , Salt Lake City, Utah
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Oh-Sung Kwon
- Geriatric Research, Education, and Clinical Center, Salt Lake City Department of Veterans Medical Center , Salt Lake City, Utah
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Gwenael Layec
- Geriatric Research, Education, and Clinical Center, Salt Lake City Department of Veterans Medical Center , Salt Lake City, Utah
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Ryan S Garten
- Department of Exercise Science, Health, and Movement Science, Virginia Commonwealth University , Richmond, Virginia
| | - Song-Young Park
- School of Health and Kinesiology, University of Nebraska , Omaha, Nebraska
| | - Ashley D Nelson
- Geriatric Research, Education, and Clinical Center, Salt Lake City Department of Veterans Medical Center , Salt Lake City, Utah
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Russell S Richardson
- Geriatric Research, Education, and Clinical Center, Salt Lake City Department of Veterans Medical Center , Salt Lake City, Utah
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
- Department of Nutrition and Integrative Physiology, University of Utah , Salt Lake City, Utah
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26
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Nam HS, Izumchenko E, Dasgupta S, Hoque MO. Mitochondria in chronic obstructive pulmonary disease and lung cancer: where are we now? Biomark Med 2017; 11:475-489. [PMID: 28598223 DOI: 10.2217/bmm-2016-0373] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Recent advances in mitochondrial biogenesis have provided the emerging recognition that mitochondria do much more than 'simply providing energy for cellular function'. Currently, a constantly improving understanding of the mitochondrial structure and function has been providing valuable insights into the contribution of defects in mitochondrial metabolism to various human diseases, including chronic obstructive pulmonary disease and lung cancer. The growing interest in mitochondria research led to development of new biomedical fields in the two main smoking-related lung diseases. However, there is considerable paucity in our understanding of mechanisms by which mitochondrial dynamics regulate lung diseases. In this review, we will discuss our current knowledge on the role of mitochondrial dysfunction in the pathogenesis of chronic obstructive pulmonary disease and non-small-cell lung cancer.
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Affiliation(s)
- Hae-Seong Nam
- Department of Otolaryngology & Head & Neck Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA.,Division of Pulmonology, Department of Internal Medicine, Inha University Hospital, Inha University School of Medicine, Incheon 22332, South Korea
| | - Evgeny Izumchenko
- Department of Otolaryngology & Head & Neck Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
| | - Santanu Dasgupta
- Department of Cellular & Molecular Biology, The University of Texas Health Science Center at Tyler, Tyler, TX 75708, USA
| | - Mohammad O Hoque
- Department of Otolaryngology & Head & Neck Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA.,Department of Urology, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA.,Department of Oncology, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
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27
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Chen RC, Li XY, Guan LL, Guo BP, Wu WL, Zhou ZQ, Huo YT, Chen X, Zhou LQ. Effectiveness of neuromuscular electrical stimulation for the rehabilitation of moderate-to-severe COPD: a meta-analysis. Int J Chron Obstruct Pulmon Dis 2016; 11:2965-2975. [PMID: 27932876 PMCID: PMC5135061 DOI: 10.2147/copd.s120555] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
PURPOSE Patients with COPD often experience skeletal muscle dysfunction. For those who are unable or unwilling to undertake physical training, neuromuscular electrical stimulation (NMES) may provide an alternative method of rehabilitation. The purpose of this meta-analysis was to investigate the controversial topic of whether this therapy is effective in patients with moderate-to-severe COPD. PATIENTS AND METHODS We pooled data from nine trials published between January 9, 2002 and January 4, 2016 across PubMed, Embase, Cochrane Central Register of Controlled Trials, Google Scholar, and relevant websites for randomized controlled trials. In these trials, patients with moderate-to-severe COPD were randomly allocated to receive NMES. Primary outcomes were quadricep strength and exercise capacity. The secondary outcome was health-related quality of life. RESULTS We extracted data from 276 patients. NMES contributed to statistically improved quadricep strength (standardized mean difference 1.12, 95% confidence interval [CI] 0.64-1.59, I2=54%; P<0.00001) and exercise capacity, including longer exercise distance (weighted mean difference 51.53, 95% CI 20.13-82.93, I2=90%; P=0.001), and longer exercise endurance (standardized mean difference 1.11, 95% CI 0.14-2.08, I2=85%; P=0.02). There was no significant difference in St George's Respiratory Questionnaire scores (weighted mean difference -0.07, 95% CI -2.44 to 2.30, I2=56%; P=0.95). CONCLUSION NMES appears an effectual means of enhancing quadricep strength and exercise capacity in moderate-to-severe COPD patients. Further research is demanded to clarify its effect on other outcomes and determine the optimal parameters for an NMES program.
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Affiliation(s)
- Rong-Chang Chen
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University
| | - Xiao-Ying Li
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University
| | - Li-Li Guan
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University
| | - Bing-Peng Guo
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University
| | - Wei-Liang Wu
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University
| | - Zi-Qing Zhou
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University
| | - Ya-Ting Huo
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University
| | - Xin Chen
- Zhujiang Hospital of Southern Medical University, Guangzhou, People's Republic of China
| | - Lu-Qian Zhou
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University
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28
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Domínguez-Álvarez M, Gea J, Barreiro E. Inflammatory Events and Oxidant Production in the Diaphragm, Gastrocnemius, and Blood of Rats Exposed to Chronic Intermittent Hypoxia: Therapeutic Strategies. J Cell Physiol 2016; 232:1165-1175. [PMID: 27635524 DOI: 10.1002/jcp.25600] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 09/14/2016] [Indexed: 01/09/2023]
Abstract
We hypothesized that inflammatory events and reactive oxygen species (ROS) production may be differentially expressed in respiratory and limb muscles, and blood of a chronic intermittent hypoxia (CIH) experimental model and that antioxidants and TNF-alpha blockade may influence those events. In blood, diaphragm, and gastrocnemius of rats non-invasively exposed to CIH (10% hypoxia, 2 h/day, 14 consecutive days) with/without concomitant treatment with either anti-TNF-alpha antibody (infliximab) or N-acetyl cysteine (NAC), inflammatory cytokines, superoxide anion production, muscle structural abnormalities, and fiber-type composition were assessed. Compared to non-exposed controls, in CIH-exposed rats, body weight gain was reduced, TNF-alpha, IL-1beta, IL-6, and interferon-gamma levels were increased in diaphragm, TNF-alpha, and IL-1 beta plasma levels were greater, systemic and muscle superoxide anion production was higher, diaphragm and gastrocnemius inflammatory cells and internal nuclei were higher, and muscle fiber-type and morphometry remained unmodified. CIH rats treated with infliximab further increased TNF-alpha, IL-1beta, IL-6, and interferon-gamma diaphragm levels, whereas NAC induced a reduction only in TNF-alpha and IL-1beta levels in diaphragm and plasma. Infliximab and NAC elicited a significant decline in superoxide anion production in diaphragm, gastrocnemius, and plasma, while inducing a further increase in inflammatory cells and internal nuclei in both muscles. Proinflammatory cytokines are differentially expressed in respiratory and limb muscles and plasma of CIH-exposed rats, while superoxide anion production increased in both muscle types and blood. Infliximab and NAC exerted different effects. These findings may help understand the biology underlying CIH in skeletal muscles and blood of patients with chronic respiratory diseases. J. Cell. Physiol. 232: 1165-1175, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Marisol Domínguez-Álvarez
- Respiratory Medicine-Muscle Wasting and Cachexia in Chronic Respiratory Diseases and Lung Cancer, IMIM-Hospital del Mar, Health and Experimental Sciences Department (CEXS), Universitat Pompeu Fabra, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
| | - Joaquim Gea
- Respiratory Medicine-Muscle Wasting and Cachexia in Chronic Respiratory Diseases and Lung Cancer, IMIM-Hospital del Mar, Health and Experimental Sciences Department (CEXS), Universitat Pompeu Fabra, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
| | - Esther Barreiro
- Respiratory Medicine-Muscle Wasting and Cachexia in Chronic Respiratory Diseases and Lung Cancer, IMIM-Hospital del Mar, Health and Experimental Sciences Department (CEXS), Universitat Pompeu Fabra, Universitat Autònoma de Barcelona, Barcelona, Spain.,Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
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29
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Azevedo DDP, Medeiros WM, de Freitas FFM, Ferreira Amorim C, Gimenes ACO, Neder JA, Chiavegato LD. High oxygen extraction and slow recovery of muscle deoxygenation kinetics after neuromuscular electrical stimulation in COPD patients. Eur J Appl Physiol 2016; 116:1899-910. [PMID: 27468840 DOI: 10.1007/s00421-016-3442-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Accepted: 07/22/2016] [Indexed: 11/27/2022]
Abstract
PURPOSE It was hypothesized that patients with chronic obstructive pulmonary disease (COPD) would exhibit a slow muscle deoxygenation (HHb) recovery time when compared with sedentary controls. METHODS Neuromuscular electrical stimulation (NMES 40 and 50 mA, 50 Hz, 400 µs) was employed to induce isometric contraction of the quadriceps. Microvascular oxygen extraction (µO2EF) and HHb were estimated by near-infrared spectroscopy (NIRS). Recovery kinetic was characterized by measuring the time constant Tau (HHb-τ). Torque and work were measured by isokinetic dynamometry in 13 non-hypoxaemic patients with moderate-to-severe COPD [SpO2 = 94.1 ± 1.6 %; FEV1 (% predict) 48.0 ± 9.6; GOLD II-III] and 13 age- and sex-matched sedentary controls. RESULTS There was no desaturation in either group during NMES. Torque and work were reduced in COPD versus control for 40 and 50 mA [torque (Nm) 50 mA = 28.9 ± 6.9 vs 46.1 ± 14.2; work (J) 50 mA = 437.2 ± 130.0 vs. 608.3 ± 136.8; P < 0.05 for all]. High µO2EF values were observed in the COPD group at both NMES intensities (corrected by muscle mass 50 mA = 6.18 ± 1.1 vs. 4.68 ± 1.0 %/kg; corrected by work 50 mA = 0.12 ± 0.05 vs. 0.07 ± 0.02 %/J; P < 0.05 for all). Absolute values of HHb-τ (50 mA = 31.11 ± 9.27 vs. 18.08 ± 10.70 s), corrected for muscle mass (50 mA 3.80 ± 1.28 vs. 2.05 ± 1.45 s/kg) and corrected for work (50 mA = 0.08 ± 0.04 vs. 0.03 ± 0.02 s/J) were reduced in COPD (P < 0.05 for all). The variables behaviour for 40 mA was similar to those of 50 mA. CONCLUSIONS COPD patients exhibited a slower muscle deoxygenation recovery time after NMES. The absence of desaturation, low torque and work, high µO2EF and high values for recovery time corrected by muscle mass and work suggest that intrinsic muscle dysfunction has an impact on muscle recovery capacity.
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Affiliation(s)
- Diego de Paiva Azevedo
- Master's and Doctoral Program in Physical Therapy, Universidade de São Paulo (UNICID), Sao Paulo, SP, Brazil
| | - Wladimir Musetti Medeiros
- Pulmonary Function and Clinical Exercise Physiology Unit, Division of Respiratory Medicine, Federal University of Sao Paulo (UNIFESP), Rua Professor Francisco de Castro 54, Vila Clementino, Sao Paulo, CEP 04020-050, Brazil
| | | | - Cesar Ferreira Amorim
- Master's and Doctoral Program in Physical Therapy, Universidade de São Paulo (UNICID), Sao Paulo, SP, Brazil
| | - Ana Cristina Oliveira Gimenes
- Pulmonary Function and Clinical Exercise Physiology Unit, Division of Respiratory Medicine, Federal University of Sao Paulo (UNIFESP), Rua Professor Francisco de Castro 54, Vila Clementino, Sao Paulo, CEP 04020-050, Brazil
| | - Jose Alberto Neder
- Pulmonary Function and Clinical Exercise Physiology Unit, Division of Respiratory Medicine, Federal University of Sao Paulo (UNIFESP), Rua Professor Francisco de Castro 54, Vila Clementino, Sao Paulo, CEP 04020-050, Brazil
| | - Luciana Dias Chiavegato
- Master's and Doctoral Program in Physical Therapy, Universidade de São Paulo (UNICID), Sao Paulo, SP, Brazil. .,Pulmonary Function and Clinical Exercise Physiology Unit, Division of Respiratory Medicine, Federal University of Sao Paulo (UNIFESP), Rua Professor Francisco de Castro 54, Vila Clementino, Sao Paulo, CEP 04020-050, Brazil.
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