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Hu M, Ladowski JM, Xu H. The Role of Autophagy in Vascular Endothelial Cell Health and Physiology. Cells 2024; 13:825. [PMID: 38786047 PMCID: PMC11120581 DOI: 10.3390/cells13100825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 04/30/2024] [Accepted: 05/03/2024] [Indexed: 05/25/2024] Open
Abstract
Autophagy is a highly conserved cellular recycling process which enables eukaryotes to maintain both cellular and overall homeostasis through the catabolic breakdown of intracellular components or the selective degradation of damaged organelles. In recent years, the importance of autophagy in vascular endothelial cells (ECs) has been increasingly recognized, and numerous studies have linked the dysregulation of autophagy to the development of endothelial dysfunction and vascular disease. Here, we provide an overview of the molecular mechanisms underlying autophagy in ECs and our current understanding of the roles of autophagy in vascular biology and review the implications of dysregulated autophagy for vascular disease. Finally, we summarize the current state of the research on compounds to modulate autophagy in ECs and identify challenges for their translation into clinical use.
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Affiliation(s)
| | - Joseph M. Ladowski
- Transplant and Immunobiology Research, Department of Surgery, Duke University, Durham, NC 27710, USA;
| | - He Xu
- Transplant and Immunobiology Research, Department of Surgery, Duke University, Durham, NC 27710, USA;
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2
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Özçatal Y, Akat F, Tatar Y, Fıçıcılar H, Serdaroğlu B, Topal Çelikkan F, Baştuğ M. Effects of high-intensity interval training (HIIT) on skeletal muscle atrophy, function, and myokine profile in diabetic myopathy. Cytokine 2023; 169:156279. [PMID: 37329818 DOI: 10.1016/j.cyto.2023.156279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 05/29/2023] [Accepted: 06/11/2023] [Indexed: 06/19/2023]
Abstract
PURPOSE Diabetes is a metabolic disorder characterized by chronic hyperglycemia due to insulin deficiency and/or loss of its action. Diabetic myopathy causes functional limitations in diabetic patients. The beneficial effects of high-intensity interval training (HIIT) are widely reported. We have hypothesized that HIIT application would prevent the development of diabetic myopathy. METHODS Male, Wistar albino rats (10 W) were randomly divided into four groups (1)Control(C), (2)Diabetes(DM), (3)Training(HIIT), and (4)Diabetes + Training(DM + HIIT). Streptozotocin(60 mg/kg) was injected for the induction of diabetes. The maximum exercise capacity(MEC) of animals was determined by an incremental load test. HIIT protocol (4 min 85-95 % MEC, 2 min 40-50 % MEC, 6 cycles, 5 days/week) was applied for 8 weeks. In the end, functional parameters, atrophy, and resistance to fatigue in soleus and EDL muscles were evaluated. IL-6, FNDC5, and myonectin levels were measured in EDL, soleus, and serum. RESULTS We observed atrophy, fatigue sensitivity, and proinflammatory alterations (IL-6 increase) in the EDL samples due to diabetic myopathy which were not observed in the soleus samples. HIIT application prevented the aforementioned detrimental alterations. Both force-frequency response and parallelly the twitch amplitude increased significantly in the DM + HIIT group. Half relaxation time (DT50) increased in both exercising and sedentary diabetics. FNDC5 was significantly higher in the exercising animals in soleus samples. Myonectin was significantly higher in the soleus muscle only in the DM + HIIT group. CONCLUSION Current findings show that diabetic myopathy develops earlier in glycolytic-fast-twitch fibers(EDL) than in oxidative-slow-twitch fibers(soleus). Furthermore, HIIT application prevents atrophy in skeletal muscle, increases resistance to fatigue, and has an anti-inflammatory effect. NEW FINDINGS The current study analyzes the myokine profile and skeletal muscle function under the effect of diabetes HIIT-type exercise. We also measured maximal exercise capacity and tailored the exercise program individually according to the result. Diabetic myopathy is an important complication of diabetes yet still, it is not understood completely. Our results show that HIIT-type training would be beneficial in diabetic myopathy but further investigation is needed to understand the whole molecular mechanism.
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Affiliation(s)
- Yeşim Özçatal
- Ankara University, Faculty of Medicine, Department of Physiology, Ankara, Turkey
| | - Fırat Akat
- Ankara University, Faculty of Medicine, Department of Physiology, Ankara, Turkey.
| | - Yakup Tatar
- TOBB Economy and Technology University, Faculty of Medicine, Department of Physiology, Ankara, Turkey
| | - Hakan Fıçıcılar
- Ankara University, Faculty of Medicine, Department of Physiology, Ankara, Turkey
| | - Bilge Serdaroğlu
- Ankara University, Faculty of Medicine, Department of Histology and Embryology, Ankara, Turkey
| | - Ferda Topal Çelikkan
- Ankara University, Faculty of Medicine, Department of Histology and Embryology, Ankara, Turkey
| | - Metin Baştuğ
- Ankara University, Faculty of Medicine, Department of Physiology, Ankara, Turkey
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Sadeghi S, Delphan M, Shams M, Esmaeili F, Shanaki-Bavarsad M, Shanaki M. The high-intensity interval training (HIIT) and curcumin supplementation can positively regulate the autophagy pathway in myocardial cells of STZ-induced diabetic rats. BMC Res Notes 2023; 16:21. [PMID: 36841820 PMCID: PMC9960211 DOI: 10.1186/s13104-023-06295-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Accepted: 02/20/2023] [Indexed: 02/27/2023] Open
Abstract
OBJECTIVE Targeting autophagy is a new therapeutic strategy for the complications of diabetes,such as diabetic cardiomyopathy (DCM). During diabetes, increased or insufficient autophagic activity causes aberrations in cellular homeostasis. Regarding the conflicting and unclear results regarding the effect of HIIT and curcumin supplementation on the expression of genes associated to autophagy, this study aimed to assess whether 4-week high-intensity interval training (HIIT) and curcumin supplementation are able to influence the expression of autophagy-related genes in myocardial cells of diabetic rats. METHODS In an experimental design, 24 male Wistar rats were randomly divided into 4 groups: non-diabetic control (NC), diabetic control (DC), diabetes + HIIT (D + HIIT), and diabetes + curcumin (D + CU). After HIIT program and curcumin treatment, the genes expression of autophagy pathway were assessed in the myocardium by real-time PCR Tanique. RESULTS The results indicated that the expression levels of ATG1, Beclin1, ATG5, and LAMP-2 genes were significantly reduced in the DC group compared to the NC group (p < 0.001). Following 4-week HIIT, the expression of Beclin1, ATG-5, and LAMP-2 improved considerably compared to the DC group (p < 0.001, p < 0.001, and p < 0.05, respectively). In addition, after 4 weeks of curcumin supplementation, the expression levels of ATG-5 and Beclin-1 were significantly improved compared to the DC group (p < 0.001, p < 0.05, respectively). It seems HIIT and curcumin supplementation can be an effective approach for inducing autophagy and improving cardiac function in DCM rats.However, HIIT seems more effective than curcumin in this regard.
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Affiliation(s)
- Samira Sadeghi
- grid.411600.2Department of Medical Laboratory Sciences, School of Allied Medical Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Maryam Delphan
- grid.411354.60000 0001 0097 6984Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Alzahra University, Tehran, Iran
| | - Masoumeh Shams
- grid.411600.2Department of Medical Laboratory Sciences, School of Allied Medical Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fataneh Esmaeili
- grid.411705.60000 0001 0166 0922Department of Clinical Biochemistry, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mahsa Shanaki-Bavarsad
- grid.266102.10000 0001 2297 6811Department of Neurology, Memory and Aging Center, University of California San Francisco, San Francisco, CA USA
| | - Mehrnoosh Shanaki
- Department of Medical Laboratory Sciences, School of Allied Medical Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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Cordeiro MM, Ribeiro RA, Bubna PB, Almeida AC, Laginski TRF, Franco GCN, Scomparin DX. Physical exercise attenuates obesity development in Western‐diet fed obese rats, independently of vitamin D supplementation. Clin Exp Pharmacol Physiol 2022; 49:633-642. [DOI: 10.1111/1440-1681.13637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 11/12/2021] [Accepted: 11/19/2021] [Indexed: 11/30/2022]
Affiliation(s)
- Maiara Mikuska Cordeiro
- General Biology Department, Biologic Science and Health Sector State University of Ponta Grossa Ponta Grossa Puerto Rico Brazil
| | - Rosane Aparecida Ribeiro
- General Biology Department, Biologic Science and Health Sector State University of Ponta Grossa Ponta Grossa Puerto Rico Brazil
| | - Patrícia Biscaia Bubna
- General Biology Department, Biologic Science and Health Sector State University of Ponta Grossa Ponta Grossa Puerto Rico Brazil
| | - Any Caroline Almeida
- General Biology Department, Biologic Science and Health Sector State University of Ponta Grossa Ponta Grossa Puerto Rico Brazil
| | | | - Gilson César Nobre Franco
- General Biology Department, Biologic Science and Health Sector State University of Ponta Grossa Ponta Grossa Puerto Rico Brazil
| | - Dionízia Xavier Scomparin
- General Biology Department, Biologic Science and Health Sector State University of Ponta Grossa Ponta Grossa Puerto Rico Brazil
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Abstract
The natural aging process is carried out by a progressive loss of homeostasis leading to a functional decline in cells and tissues. The accumulation of these changes stem from a multifactorial process on which both external (environmental and social) and internal (genetic and biological) risk factors contribute to the development of adult chronic diseases, including type 2 diabetes mellitus (T2D). Strategies that can slow cellular aging include changes in diet, lifestyle and drugs that modulate intracellular signaling. Exercise is a promising lifestyle intervention that has shown antiaging effects by extending lifespan and healthspan through decreasing the nine hallmarks of aging and age-associated inflammation. Herein, we review the effects of exercise to attenuate aging from a clinical to a cellular level, listing its effects upon various tissues and systems as well as its capacity to reverse many of the hallmarks of aging. Additionally, we suggest AMPK as a central regulator of the cellular effects of exercise due to its integrative effects in different tissues. These concepts are especially relevant in the setting of T2D, where cellular aging is accelerated and exercise can counteract these effects through the reviewed antiaging mechanisms.
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Wang L, Wang J, Cretoiu D, Li G, Xiao J. Exercise-mediated regulation of autophagy in the cardiovascular system. JOURNAL OF SPORT AND HEALTH SCIENCE 2020; 9:203-210. [PMID: 32444145 PMCID: PMC7242217 DOI: 10.1016/j.jshs.2019.10.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 08/07/2019] [Accepted: 09/04/2019] [Indexed: 05/02/2023]
Abstract
Cardiovascular disease is the leading cause of human death worldwide. Autophagy is an evolutionarily conserved degradation pathway, which is a highly conserved cellular degradation process in which lysosomes decompose their own organelles and recycle the resulting macromolecules. Autophagy is critical in maintaining cardiovascular homeostasis and function, and excessive or insufficient autophagy or autophagic flux can lead to cardiovascular disease. Enormous evidence indicates that exercise training plays a beneficial role in the prevention and treatment of cardiovascular diseases. The regulation of autophagy during exercise is a bidirectional process. For cardiovascular disease caused by either insufficient or excessive autophagy, exercise training restores normal autophagy function and delays the progression of cardiovascular disease. An in-depth exploration and discussion of exercise-mediated regulation of autophagy in the cardiovascular system can broaden our view about the prevention of various autophagy-related diseases through exercise training. In this article, we review autophagy and its related signaling pathways, as well as autophagy-dependent beneficial effects of exercise in cardiovascular system.
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Affiliation(s)
- Lijun Wang
- Cardiac Regeneration and Ageing Lab, Institute of Cardiovascular Sciences, School of Life Science, Shanghai University, Shanghai 200444, China
| | - Jiaqi Wang
- Cardiac Regeneration and Ageing Lab, Institute of Cardiovascular Sciences, School of Life Science, Shanghai University, Shanghai 200444, China
| | - Dragos Cretoiu
- Department of Cell and Molecular Biology and Histology, Carol Davila University of Medicine and Pharmacy, Bucharest 050474, Romania; Alessandrescu-Rusescu National Institute of Mother and Child Health, Fetal Medicine Excellence Research Center, Bucharest 020395, Romania
| | - Guoping Li
- Cardiovascular Division of the Massachusetts General Hospital and Harvard Medical School, Boston, MA 02215, USA
| | - Junjie Xiao
- Cardiac Regeneration and Ageing Lab, Institute of Cardiovascular Sciences, School of Life Science, Shanghai University, Shanghai 200444, China.
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Zhong W, Shi X, Yuan H, Bu H, Wu L, Wang R. Effects of Exercise Training on the Autophagy-Related Muscular Proteins Expression in Ovariectomized Rats. Front Physiol 2019; 10:735. [PMID: 31263428 PMCID: PMC6585433 DOI: 10.3389/fphys.2019.00735] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Accepted: 05/27/2019] [Indexed: 12/25/2022] Open
Abstract
Ovariectomy disrupts estrogen production and homeostasis. However, whether exercise training (ET) could counteract the ovariectomy-induced effect on muscular autophagy has remained elusive. This study examined muscular autophagy in ovariectomized (OVX) rats following 8 weeks of swimming ET. Here, 40 6-month-old female Sprague-Dawley rats were randomly divided into five groups: sham-operated control (Sham), OVX control (OVX), OVX with 60-min ET (OVX-60ET), 90-min ET (OVX-90ET), and 120-min ET (OVX-120ET) for 6 days/week. According to the results of Western blotting, the expression levels of autophagy-related proteins in the OVX gastrocnemius muscle, including mammalian target of rapamycin, uncoordinated 51-like kinase 1, Beclin-1, autophagy-related gene (Atg-7), and microtubule-associated protein light chains 3 were significantly decreased (all P < 0.05), while there was an elevation on the p62 level. ET appreciably mitigated the OVX-induced negative effects on muscle quality and the autophagy pathway, which seemed to be dependent on ET volume. The most optimal outcomes were observed in the OVX-90ET group. The OVX-120 group had an adversely augmented catabolic process associated with gastrocnemius muscle atrophy. In conclusion, the expression levels of autophagy proteins are decreased in OVX rats, which can be appreciably mitigated following 8 weeks of swimming ET.
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Affiliation(s)
- Weiquan Zhong
- School of Kinesiology, Shanghai University of Sport, Shanghai, China.,School of Medical Technology, Xuzhou Medical University, Xuzhou, China
| | - Xiangrong Shi
- Institute for Healthy Aging, University of North Texas Health Science Center, Fort Worth, TX, United States
| | - Honghua Yuan
- Research Facility Center for Morphology, Xuzhou Medical University, Xuzhou, China
| | - Huimin Bu
- Department of Physiology, Xuzhou Medical University, Xuzhou, China
| | - Lianlian Wu
- Laboratory Animal Center, Xuzhou Medical University, Xuzhou, China
| | - Renwei Wang
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
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Altarifi A, Kalha Z, Kana'an S, Alfaqih M, Alsalem M. Effects of combined swimming exercise and non‑steroidal anti‑inflammatory drugs on inflammatory nociception in rats. Exp Ther Med 2019; 17:4303-4311. [DOI: 10.3892/etm.2019.7413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 03/08/2019] [Indexed: 11/05/2022] Open
Affiliation(s)
- Ahmad Altarifi
- Department of Pharmacology, Faculty of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Zain Kalha
- Department of Pharmacology, Faculty of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Saddam Kana'an
- Department of Rehabilitation Sciences, Applied Medical Sciences, Faculty of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Mahmoud Alfaqih
- Department of Physiology and Biochemistry, Faculty of Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Mohammad Alsalem
- Department of Anatomy and Histology, School of Medicine, University of Jordan, Irbid 22110, Jordan
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Santana A, Debastiani JC, Kunz RI, Buratti P, Brancalhão RMC, de Fátima Chasko Ribeiro L, Torrejais MM, Bertolini GRF. Association of sericin and swimming on the phenotype, motor plate, and functionality of the denervated plantar muscle of Wistar rats. J Exerc Rehabil 2018; 14:24-31. [PMID: 29511649 PMCID: PMC5833964 DOI: 10.12965/jer.1835138.569] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 01/23/2018] [Indexed: 01/24/2023] Open
Abstract
Physical exercise may help maintain muscle properties and functional improvement after peripheral nerve lesion, which may be enhanced by using biocompatible substances, such as sericin. The aim of this study was analyse the effect of sericin associated with swimming exercise on the phenotype, innervation, and functionality of the plantar muscle of Wistar rats. Forty randomly divided adult rats were used in five groups of eight animals: control, injury, sericin, exercise, exercise and sericin. The application of sericin was done on the spot, 100 μL, shortly after nerve compression. Three days after sciatic nerve compression, the swimming and swimming and sericin groups were submitted to physical swimming exercise for 21 days. Afterwards, the animals were euthanised and the plantar muscle was dissected and submitted to histochemical and histoenzymological techniques. The grip strength test did not show alterations in muscular functionality, and the control presented greater muscle mass in relation to the other groups, the same did not occur for muscle length. Polymorphic neuromuscular junctions were detected in the groups, although without significant morphometric alterations of the area, major and minor diameters. The percentage of type I fibres was lower in the lesion group and there was no difference in fibres IIa and IIb between groups. The area of fibres I, IIa and IIb remained constant between groups. Sericin biopolymer combined with swimming exercise did not affect plantar muscle function, submitted to experimental axonotmosis, whose contractile properties were altered by nerve injury.
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Affiliation(s)
- André Santana
- Programa de Pós-Graduação em Biociências e Saúde da, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | - Jean Carlos Debastiani
- Programa de Pós-Graduação em Biociências e Saúde da, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | - Regina Inês Kunz
- Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | - Pamela Buratti
- Programa de Pós-Graduação em Biociências e Saúde da, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
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Abstract
Protein quality control (proteostasis) depends on constant protein degradation and resynthesis, and is essential for proper homeostasis in systems from single cells to whole organisms. Cells possess several mechanisms and processes to maintain proteostasis. At one end of the spectrum, the heat shock proteins modulate protein folding and repair. At the other end, the proteasome and autophagy as well as other lysosome-dependent systems, function in the degradation of dysfunctional proteins. In this review, we examine how these systems interact to maintain proteostasis. Both the direct cellular data on heat shock control over autophagy and the time course of exercise-associated changes in humans support the model that heat shock response and autophagy are tightly linked. Studying the links between exercise stress and molecular control of proteostasis provides evidence that the heat shock response and autophagy coordinate and undergo sequential activation and downregulation, and that this is essential for proper proteostasis in eukaryotic systems.
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Key Words
- AKT, v-akt murine thymoma viral oncogene homolog 1
- AMPK, adenosine monophosphate-activated protein kinase
- ATG, autophagy-related
- BECN1, Beclin 1, autophagy related
- EIF4EBP1, eukaryotic translation initiation factor 4E binding protein 1
- ER, endoplasmic reticulum
- FOXO, forkhead box O
- HSF1, heat shock transcription factor 1
- HSP, heat shock protein
- HSP70
- HSPA8/HSC70, heat shock 70kDa protein 8
- IL, interleukin
- LC3, MAP1LC3, microtubule-associated protein 1 light chain 3
- MTMR14/hJumpy, myotubularin related protein 14
- MTOR, mechanistic target of rapamycin
- NR1D1/Rev-Erb-α, nuclear receptor subfamily 1, group D, member 1
- PBMC, peripheral blood mononuclear cell
- PPARGC1A/PGC-1α, peroxisome proliferator-activated receptor, gamma, coactivator 1 α
- RHEB, Ras homolog enriched in brain
- SOD, superoxide dismutase
- SQSTM1/p62, sequestosome 1
- TPR, translocated promoter region, nuclear basket protein
- TSC, tuberous sclerosis complex
- ULK1, unc-51 like autophagy activating kinase 1
- autophagy
- exercise
- heat shock response
- humans
- protein breakdown
- protein synthesis
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Affiliation(s)
- Karol Dokladny
- a Department of Internal Medicine; Health Sciences Center; Health, Exercise & Sports Science of University of New Mexico ; Albuquerque , NM USA
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Fritzen AM, Madsen AB, Kleinert M, Treebak JT, Lundsgaard AM, Jensen TE, Richter EA, Wojtaszewski J, Kiens B, Frøsig C. Regulation of autophagy in human skeletal muscle: effects of exercise, exercise training and insulin stimulation. J Physiol 2016; 594:745-61. [PMID: 26614120 DOI: 10.1113/jp271405] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 11/25/2015] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Regulation of autophagy in human muscle in many aspects differs from the majority of previous reports based on studies in cell systems and rodent muscle. An acute bout of exercise and insulin stimulation reduce human muscle autophagosome content. An acute bout of exercise regulates autophagy by a local contraction-induced mechanism. Exercise training increases the capacity for formation of autophagosomes in human muscle. AMPK activation during exercise seems insufficient to regulate autophagosome content in muscle, while mTORC1 signalling via ULK1 probably mediates the autophagy-inhibiting effect of insulin. Studies in rodent muscle suggest that autophagy is regulated by acute exercise, exercise training and insulin stimulation. However, little is known about the regulation of autophagy in human skeletal muscle. Here we investigate the autophagic response to acute one-legged exercise, one-legged exercise training and subsequent insulin stimulation in exercised and non-exercised human muscle. Acute one-legged exercise decreased (P<0.01) lipidation of microtubule-associated protein 1A/1B-light chain 3 (LC3) (∼ 50%) and the LC3-II/LC3-I ratio (∼ 60%) indicating that content of autophagosomes decreases with exercise in human muscle. The decrease in LC3-II/LC3-I ratio did not correlate with activation of 5'AMP activated protein kinase (AMPK) trimer complexes in human muscle. Consistently, pharmacological AMPK activation with 5-aminoimidazole-4-carboxamide riboside (AICAR) in mouse muscle did not affect the LC3-II/LC3-I ratio. Four hours after exercise, insulin further reduced (P<0.01) the LC3-II/LC3-I ratio (∼ 80%) in muscle of the exercised and non-exercised leg in humans. This coincided with increased Ser-757 phosphorylation of Unc51 like kinase 1 (ULK1), which is suggested as a mammalian target of rapamycin complex 1 (mTORC1) target. Accordingly, inhibition of mTOR signalling in mouse muscle prevented the ability of insulin to reduce the LC3-II/LC3-I ratio. In response to 3 weeks of one-legged exercise training, the LC3-II/LC3-I ratio decreased (P<0.05) in both trained and untrained muscle and this change was largely driven by an increase in LC3-I content. Taken together, acute exercise and insulin stimulation reduce muscle autophagosome content, while exercise training may increase the capacity for formation of autophagosomes in muscle. Moreover, AMPK activation during exercise may not be sufficient to regulate autophagy in muscle, while mTORC1 signalling via ULK1 probably mediates the autophagy-inhibiting effect of insulin.
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Affiliation(s)
- Andreas M Fritzen
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Agnete B Madsen
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Maximilian Kleinert
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Jonas T Treebak
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark.,The Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Integrative Physiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anne-Marie Lundsgaard
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Thomas E Jensen
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Erik A Richter
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Jørgen Wojtaszewski
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Bente Kiens
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Christian Frøsig
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, the August Krogh Centre, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
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Coradinia JG, Kakihata CMM, Kunz RI, Errero TK, Bonfleur ML, Bertolini GRF. Avaliação da força de preensão em ratos Wistar, normais e obesos, submetidos à natação com sobrecarga após compressão do nervo mediano. REVISTA BRASILEIRA DE REUMATOLOGIA 2015; 55:43-7. [DOI: 10.1016/j.rbr.2014.08.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 07/29/2014] [Accepted: 08/26/2014] [Indexed: 11/29/2022] Open
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Fiuza-Luces C, Garatachea N, Berger NA, Lucia A. Exercise is the real polypill. Physiology (Bethesda) 2014; 28:330-58. [PMID: 23997192 DOI: 10.1152/physiol.00019.2013] [Citation(s) in RCA: 325] [Impact Index Per Article: 32.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The concept of a "polypill" is receiving growing attention to prevent cardiovascular disease. Yet similar if not overall higher benefits are achievable with regular exercise, a drug-free intervention for which our genome has been haped over evolution. Compared with drugs, exercise is available at low cost and relatively free of adverse effects. We summarize epidemiological evidence on the preventive/therapeutic benefits of exercise and on the main biological mediators involved.
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Macronutrient composition of the diet affects the feeding-mediated down regulation of autophagy in muscle of rainbow trout (O. mykiss). PLoS One 2013; 8:e74308. [PMID: 24069294 PMCID: PMC3771976 DOI: 10.1371/journal.pone.0074308] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Accepted: 07/31/2013] [Indexed: 01/18/2023] Open
Abstract
Autophagy functions as an important catabolic mechanism by mediating the turnover of intracellular organelles and protein complexes through a lysosome dependent degradative pathway. Although the induction of autophagy by starvation has been extensively studied, we still know very little about how autophagy is regulated under normal nutritional conditions. The purpose of the present study was to characterize both in vivo and in vitro the response of the autophagy-lysosomal degradative pathway to nutrient (amino acids and carbohydrates) availability in the muscle of the carnivorous rainbow trout. We report that meal feeding is accompanied by a rapid activation of Akt, FoxO1 and the Target of Rapamycin (TOR) signaling pathways and a concomitant decrease of autophagosome formation. We also show that this effect occurs only when the proportion of dietary proteins increases at the expense of carbohydrates. Concurrently, our in vitro study on primary culture of trout muscle cells demonstrates an opposite effect of amino acids and glucose on the regulation of autophagy-lysosomal pathways. More specifically, the addition of amino acids in cell culture medium inhibited the formation of autophagosomes, whereas the addition of glucose had an opposite effect. The effect of amino acids was accompanied by an activation of TOR, considered as an important regulator of autophagosomal formation. However, the mechanisms involved in the effect of glucose were independent of Akt, TOR and AMPK and remain to be determined. Together, these results demonstrated the specific role of macronutrients as well as that of their interactions in the regulation of autophagy and highlight the interest to consider the macronutrient composition of the diets in the control of this degradative pathway.
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Transcriptional Regulation by Nuclear Corepressors and PGC-1α: Implications for Mitochondrial Quality Control and Insulin Sensitivity. PPAR Res 2012; 2012:348245. [PMID: 23304112 PMCID: PMC3523614 DOI: 10.1155/2012/348245] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Revised: 11/06/2012] [Accepted: 11/13/2012] [Indexed: 02/07/2023] Open
Abstract
The peroxisome proliferator-activated receptors (PPARs) and estrogen-related receptor (ERRα) are ligand-activated nuclear receptors that coordinately regulate gene expression. Recent evidence suggests that nuclear corepressors, NCoR, RIP140, and SMRT, repress nuclear receptors-mediated transcriptional activity on specific promoters, and thus regulate insulin sensitivity, adipogenesis, mitochondrial number, and activity in vivo. Moreover, the coactivator PGC-1α that increases mitochondrial biogenesis during exercise and calorie restriction directly regulates autophagy in skeletal muscle and mitophagy in the pathogenesis of Parkinson's disease. In this paper, we discuss the PGC-1α's novel role in mitochondrial quality control and the role of nuclear corepressors in regulating insulin sensitivity and interacting with PGC-1α.
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