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Guichard M, Holla S, Wernerová D, Grossmann G, Minina EA. RoPod, a customizable toolkit for non-invasive root imaging, reveals cell type-specific dynamics of plant autophagy. Sci Rep 2024; 14:12664. [PMID: 38830985 PMCID: PMC11148066 DOI: 10.1038/s41598-024-63226-1] [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: 12/02/2021] [Accepted: 05/24/2024] [Indexed: 06/05/2024] Open
Abstract
Arabidopsis root is a classic model system in plant cell and molecular biology. The sensitivity of plant roots to local environmental perturbation challenges data reproducibility and incentivizes further optimization of imaging and phenotyping tools. Here we present RoPod, an easy-to-use toolkit for low-stress live time-lapse imaging of Arabidopsis roots. RoPod comprises a dedicated protocol for plant cultivation and a customizable 3D-printed vessel with integrated microscopy-grade glass that serves simultaneously as a growth and imaging chamber. RoPod reduces impact of sample handling, preserves live samples for prolonged imaging sessions, and facilitates application of treatments during image acquisition. We describe a protocol for RoPods fabrication and provide illustrative application pipelines for monitoring root hair growth and autophagic activity. Furthermore, we showcase how the use of RoPods advanced our understanding of plant autophagy, a major catabolic pathway and a key player in plant fitness. Specifically, we obtained fine time resolution for autophagy response to commonly used chemical modulators of the pathway and revealed previously overlooked cell type-specific changes in the autophagy response. These results will aid a deeper understanding of the physiological role of autophagy and provide valuable guidelines for choosing sampling time during end-point assays currently employed in plant autophagy research.
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Affiliation(s)
- Marjorie Guichard
- Centre for Organismal Studies, Heidelberg University, Im Neuenheimer Feld 230, 69120, Heidelberg, Germany.
- Institute of Cell and Interaction Biology, Heinrich-Heine-University Düsseldorf, 40225, Düsseldorf, Germany.
- CEPLAS Cluster of Excellence on Plant Sciences, Heinrich-Heine-University Düsseldorf, 40225, Düsseldorf, Germany.
| | - Sanjana Holla
- Department of Molecular Sciences, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, P.O. Box 7015, SE-750 07, Uppsala, Sweden
| | - Daša Wernerová
- Institute of Cell and Interaction Biology, Heinrich-Heine-University Düsseldorf, 40225, Düsseldorf, Germany
| | - Guido Grossmann
- Centre for Organismal Studies, Heidelberg University, Im Neuenheimer Feld 230, 69120, Heidelberg, Germany
- Institute of Cell and Interaction Biology, Heinrich-Heine-University Düsseldorf, 40225, Düsseldorf, Germany
- CEPLAS Cluster of Excellence on Plant Sciences, Heinrich-Heine-University Düsseldorf, 40225, Düsseldorf, Germany
| | - Elena A Minina
- Centre for Organismal Studies, Heidelberg University, Im Neuenheimer Feld 230, 69120, Heidelberg, Germany.
- Department of Molecular Sciences, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, P.O. Box 7015, SE-750 07, Uppsala, Sweden.
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2
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Cheng Y, Yan M, He S, Xie Y, Wei L, Xuan B, Shang Z, Wu M, Zheng H, Chen Y, Yuan M, Peng J, Shen A. Baicalin alleviates angiotensin II-induced cardiomyocyte apoptosis and autophagy and modulates the AMPK/mTOR pathway. J Cell Mol Med 2024; 28:e18321. [PMID: 38712979 PMCID: PMC11075640 DOI: 10.1111/jcmm.18321] [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: 01/08/2024] [Revised: 03/04/2024] [Accepted: 04/03/2024] [Indexed: 05/08/2024] Open
Abstract
As a main extraction compound from Scutellaria baicalensis Georgi, Baicalin exhibits various biological activities. However, the underlying mechanism of Baicalin on hypertension-induced heart injury remains unclear. In vivo, mice were infused with angiotensin II (Ang II; 500 ng/kg/min) or saline using osmotic pumps, followed by intragastrically administrated with Baicalin (5 mg/kg/day) for 4 weeks. In vitro, H9C2 cells were stimulated with Ang II (1 μM) and treated with Baicalin (12.5, 25 and 50 μM). Baicalin treatment significantly attenuated the decrease in left ventricular ejection fraction and left ventricular fractional shortening, increase in left ventricular mass, left ventricular systolic volume and left ventricular diastolic volume of Ang II infused mice. Moreover, Baicalin treatment reversed 314 differentially expressed transcripts in the cardiac tissues of Ang II infused mice, and enriched multiple enriched signalling pathways (including apoptosis, autophagy, AMPK/mTOR signalling pathway). Consistently, Baicalin treatment significantly alleviated Ang II-induced cell apoptosis in vivo and in vitro. Baicalin treatment reversed the up-regulation of Bax, cleaved-caspase 3, cleaved-caspase 9, and the down-regulation of Bcl-2. Meanwhile, Baicalin treatment alleviated Ang II-induced increase of autophagosomes, restored autophagic flux, and down-regulated LC3II, Beclin 1, as well as up-regulated SQSTM1/p62 expression. Furthermore, autophagy inhibitor 3-methyladenine treatment alleviated the increase of autophagosomes and the up-regulation of Beclin 1, LC3II, Bax, cleaved-caspase 3, cleaved-caspase 9, down-regulation of SQSTM1/p62 and Bcl-2 expression after Ang II treated, which similar to co-treatment with Baicalin. Baicalin treatment reduced the ratio of p-AMPK/AMPK, while increased the ratio of p-mTOR/mTOR. Baicalin alleviated Ang II-induced cardiomyocyte apoptosis and autophagy, which might be related to the inhibition of the AMPK/mTOR pathway.
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Affiliation(s)
- Ying Cheng
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
| | - Mengchao Yan
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
| | - Shuyu He
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
| | - Yi Xie
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
| | - Lihui Wei
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
- Innovation and Transformation CenterFujian University of Traditional Chinese MedicineFuzhouFujianChina
| | - Bihan Xuan
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
| | - Zucheng Shang
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
| | - Meizhu Wu
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
| | - Huifang Zheng
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
- Innovation and Transformation CenterFujian University of Traditional Chinese MedicineFuzhouFujianChina
| | - Youqin Chen
- Department of PediatricsRainbow Babies and Children's Hospital and Case Western Reserve University School of MedicineClevelandOhioUSA
| | - Meng Yuan
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
- Innovation and Transformation CenterFujian University of Traditional Chinese MedicineFuzhouFujianChina
| | - Jun Peng
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
- Innovation and Transformation CenterFujian University of Traditional Chinese MedicineFuzhouFujianChina
| | - Aling Shen
- Academy of Integrative MedicineFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Key Laboratory of Integrative Medicine on GeriatricsFujian University of Traditional Chinese MedicineFuzhouFujianChina
- Fujian Collaborative Innovation Center for Integrative Medicine in Prevention and Treatment of Major Chronic Cardiovascular DiseasesFuzhouFujianChina
- Innovation and Transformation CenterFujian University of Traditional Chinese MedicineFuzhouFujianChina
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3
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Shang R, Miao J. Mechanisms and effects of metformin on skeletal muscle disorders. Front Neurol 2023; 14:1275266. [PMID: 37928155 PMCID: PMC10621799 DOI: 10.3389/fneur.2023.1275266] [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: 08/10/2023] [Accepted: 10/09/2023] [Indexed: 11/07/2023] Open
Abstract
Skeletal muscle disorders are mostly genetic and include several rare diseases. With disease progression, muscle fibrosis and adiposis occur, resulting in limited mobility. The long course of these diseases combined with limited treatment options affect patients both psychologically and economically, hence the development of novel treatments for neuromuscular diseases is crucial to obtain a better quality of life. As a widely used hypoglycemic drug in clinical practice, metformin not only has anti-inflammatory, autophagy-regulating, and mitochondrial biogenesis-regulating effects, but it has also been reported to improve the symptoms of neuromuscular diseases, delay hypokinesia, and regulate skeletal muscle mass. However, metformin's specific mechanism of action in neuromuscular diseases requires further elucidation. This review summarizes the evidence showing that metformin can regulate inflammation, autophagy, and mitochondrial biogenesis through different pathways, and further explores its mechanism of action in Duchenne muscular dystrophy, statin-associated muscle disorders, and age-related sarcopenia. This review clarifies the directions of future research on therapy for neuromuscular diseases.
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Affiliation(s)
| | - Jing Miao
- Department of Neurology, The First Hospital of Jilin University, Changchun, China
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4
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Tang C, Wang Y, Chen D, Zhang M, Xu J, Xu C, Liu J, Kan J, Jin C. Natural polysaccharides protect against diet-induced obesity by improving lipid metabolism and regulating the immune system. Food Res Int 2023; 172:113192. [PMID: 37689942 DOI: 10.1016/j.foodres.2023.113192] [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: 04/17/2023] [Revised: 06/25/2023] [Accepted: 06/27/2023] [Indexed: 09/11/2023]
Abstract
Unhealthy dietary patterns-induced obesity and obesity-related complications pose a great threat to human health all over the world. Accumulating evidence suggests that the pathophysiology of obesity and obesity-associated metabolic disorders is closely associated with dysregulation of lipid and energy metabolism, and metabolic inflammation. In this review, three potential anti-obesity mechanisms of natural polysaccharides are introduced. Firstly, natural polysaccharides protect against diet-induced obesity directly by improving lipid and cholesterol metabolism. Since the immunity also affects lipid and energy metabolism, natural polysaccharides improve lipid and energy metabolism by regulating host immunity. Moreover, diet-induced mitochondrial dysfunction, prolonged endoplasmic reticulum stress, defective autophagy and microbial dysbiosis can disrupt lipid and/or energy metabolism in a direct and/or inflammation-induced manner. Therefore, natural polysaccharides also improve lipid and energy metabolism and suppress inflammation by alleviating mitochondrial dysfunction and endoplasmic reticulum stress, promoting autophagy and regulating gut microbiota composition. Specifically, this review comprehensively summarizes underlying anti-obesity mechanisms of natural polysaccharides and provides a theoretical basis for the development of functional foods. For the first time, this review elucidates anti-obesity mechanisms of natural polysaccharides from the perspectives of their hypolipidemic, energy-regulating and immune-regulating mechanisms.
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Affiliation(s)
- Chao Tang
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Yuxin Wang
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Dan Chen
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Man Zhang
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Jingguo Xu
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Chen Xu
- Nanjing Key Laboratory of Quality and safety of agricultural product, Nanjing Xiaozhuang University, Nanjing 211171, China.
| | - Jun Liu
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Juan Kan
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Changhai Jin
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
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5
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Obradovic M, Zafirovic S, Gluvic Z, Radovanovic J, Isenovic ER. Autophagy and diabetes. EXPLORATION OF MEDICINE 2023:576-588. [DOI: 10.37349/emed.2023.00162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 05/29/2023] [Indexed: 10/13/2023] Open
Abstract
The current literature findings on autophagy’s beneficial and detrimental roles in diabetes mellitus (DM) and diabetes-related comorbidities were reviewed. The effects of oral hypoglycaemic medicines and autophagy in DM. Autophagy plays an important function in cellular homeostasis by promoting cell survival or initiating cell death in physiological settings was also assessed. Although autophagy protects insulin-target tissues, organelle failure caused by autophagy malfunction influences DM and other metabolic diseases. Endoplasmic reticulum and oxidative stress enhance autophagy levels, making it easier to regulate stress-induced intracellular changes. Evidence suggests that autophagy-caused cell death can occur when autophagy is overstimulated and constitutively activated, which might prevent or develop DM. Even though the precise role of autophagy in DM complications is uncertain, deregulation of the autophagic machinery is strongly linked to beta cell destruction and the aetiology of DM. Thus, improving autophagy dysfunction is a possible therapeutic objective in treating DM and other metabolic disorders.
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Affiliation(s)
- Milan Obradovic
- Department of Radiobiology and Molecular Genetics, VINČA Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
| | - Sonja Zafirovic
- Department of Radiobiology and Molecular Genetics, VINČA Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
| | - Zoran Gluvic
- Department of Endocrinology and Diabetes, Zemun Clinical Hospital, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
| | - Jelena Radovanovic
- Department of Radiobiology and Molecular Genetics, VINČA Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
| | - Esma R. Isenovic
- Department of Radiobiology and Molecular Genetics, VINČA Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
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6
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Sindhu R, Manonmani HK. L-asparaginase mediated therapy in L-asparagine auxotrophic cancers: A review. Anticancer Agents Med Chem 2022; 22:2393-2410. [PMID: 34994334 DOI: 10.2174/1871520622666220106103336] [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: 04/22/2021] [Revised: 09/28/2021] [Accepted: 11/15/2021] [Indexed: 11/22/2022]
Abstract
Microbial L-asparaginase is the most effective first-line therapeutic used in the treatment protocols of paediatric and adult leukemia. Leukemic cell's auxotrophy for L-asparagine is exploited as a therapeutic strategy to mediate cell death through metabolic blockade of L-asparagine using L-asparaginase. Escherichia coli and Erwinia chrysanthemi serve as the major enzyme deriving sources accepted in clinical practise and the enzyme has bestowed improvements in patient outcomes over the last 40 years. However, an array of side effects generated by the native enzymes due to glutamine co-catalysis and short serum stays augmenting frequent dosages, intended a therapeutic switch towards the development of biobetter alternatives for the enzyme including the formulations resulting in sustained local depletion of L-asparagine. In addition, the treatment with L-asparaginase in few cancer types has proven to elicit drug-induced cytoprotective autophagy mechanisms and therefore warrants concern. Although the off-target glutamine hydrolysis has been viewed in contributing the drug-induced secondary responses in cells deficient with asparagine synthetase machinery, the beneficial role of glutaminase-asparaginase in proliferative regulation of asparagine prototrophic cells has been looked forward. The current review provides an overview on the enzyme's clinical applications in leukemia and possible therapeutic implications in other solid tumours, recent advancements in drug formulations, and discusses the aspects of two-sided roles of glutaminase-asparaginases and drug-induced cytoprotective autophagy mechanisms.
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Affiliation(s)
- Sindhu R
- Department of Microbiology, Faculty of Life Sciences, JSS-AHER, Mysuru-570015, Karnataka, India
| | - H K Manonmani
- Food Protectants and Infestation Control Department, CSIR-Central Food Technological Research Institute, Mysuru-570020, Karnataka, India
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7
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Rana T, Behl T, Sehgal A, Mehta V, Singh S, Bhatia S, Al-Harrasi A, Bungau S. Exploring the Role of Autophagy Dysfunction in Neurodegenerative Disorders. Mol Neurobiol 2021; 58:4886-4905. [PMID: 34212304 DOI: 10.1007/s12035-021-02472-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 06/21/2021] [Indexed: 12/12/2022]
Abstract
Autophagy is a catabolic pathway by which misfolded proteins or damaged organelles are engulfed by autophagosomes and then transported to lysosomes for degradation. Recently, a great improvement has been done to explain the molecular mechanisms and roles of autophagy in several important cellular metabolic processes. Besides being a vital clearance pathway or a cell survival pathway in response to different stresses, autophagy dysfunction, either upregulated or down-regulated, has been suggested to be linked with numerous neurodegenerative disorders like Alzheimer's disease, Parkinson's disease, Huntington's disease, and Amyotrophic lateral sclerosis. Impairment at different stages of autophagy results in the formation of large protein aggregates and damaged organelles, which leads to the onset and progression of different neurodegenerative disorders. This article elucidates the recent progress about the role of autophagy in neurodegenerative disorders and explains how autophagy dysfunction is linked with the pathogenesis of such disorders as well as the novel potential autophagy-associated therapies for treating them.
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Affiliation(s)
- Tarapati Rana
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
- Government Pharmacy College, Seraj, Mandi, Himachal Pradesh, India
| | - Tapan Behl
- Chitkara College of Pharmacy, Chitkara University, Punjab, India.
| | - Aayush Sehgal
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Vineet Mehta
- Government College of Pharmacy, Rohru, Distt. Shimla, Himachal Pradesh, India
| | - Sukhbir Singh
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Saurabh Bhatia
- Amity Institute of Pharmacy, Amity University, Haryana, India
- Natural & Medical Sciences Research Centre, University of Nizwa, Nizwa, Oman
| | - Ahmed Al-Harrasi
- Natural & Medical Sciences Research Centre, University of Nizwa, Nizwa, Oman
| | - Simona Bungau
- Department of Pharmacy, Faculty of Medicine and Pharmacy, University of Oradea, Oradea, Romania
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8
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Zullo A, Mancini FP, Schleip R, Wearing S, Klingler W. Fibrosis: Sirtuins at the checkpoints of myofibroblast differentiation and profibrotic activity. Wound Repair Regen 2021; 29:650-666. [PMID: 34077595 DOI: 10.1111/wrr.12943] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 05/04/2021] [Accepted: 05/06/2021] [Indexed: 12/11/2022]
Abstract
Fibrotic diseases are still a serious concern for public health, due to their high prevalence, complex etiology and lack of successful treatments. Fibrosis consists of excessive accumulation of extracellular matrix components. As a result, the structure and function of tissues are impaired, thus potentially leading to organ failure and death in several chronic diseases. Myofibroblasts represent the principal cellular mediators of fibrosis, due to their extracellular matrix producing activity, and originate from different types of precursor cells, such as mesenchymal cells, epithelial cells and fibroblasts. Profibrotic activation of myofibroblasts can be triggered by a variety of mechanisms, including the transforming growth factor-β signalling pathway, which is a major factor driving fibrosis. Interestingly, preclinical and clinical studies showed that fibrotic degeneration can stop and even reverse by using specific antifibrotic treatments. Increasing scientific evidence is being accumulated about the role of sirtuins in modulating the molecular pathways responsible for the onset and development of fibrotic diseases. Sirtuins are NAD+ -dependent protein deacetylases that play a crucial role in several molecular pathways within the cells, many of which at the crossroad between health and disease. In this context, we will report the current knowledge supporting the role of sirtuins in the balance between healthy and diseased myofibroblast activity. In particular, we will address the signalling pathways and the molecular targets that trigger the differentiation and profibrotic activation of myofibroblasts and can be modulated by sirtuins.
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Affiliation(s)
- Alberto Zullo
- Department of Sciences and Technologies, Benevento, Italy.,CEINGE Advanced Biotechnologies s.c.a.r.l. Naples, Italy
| | | | - Robert Schleip
- Department of Sport and Health Sciences, Technical University Munich, Germany.,Fascia Research Group, Department of Neurosurgery, Ulm University, Germany.,Diploma University of Applied Sciences, Bad Sooden-Allendorf, Germany
| | - Scott Wearing
- Department of Sport and Health Sciences, Technical University Munich, Germany.,Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Werner Klingler
- Department of Sport and Health Sciences, Technical University Munich, Germany.,Fascia Research Group, Department of Neurosurgery, Ulm University, Germany.,Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia.,Department of Anaesthesiology, SRH Hospital Sigmaringen, Germany
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9
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Xu F, Tautenhahn HM, Dirsch O, Dahmen U. Modulation of Autophagy: A Novel "Rejuvenation" Strategy for the Aging Liver. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:6611126. [PMID: 33628363 PMCID: PMC7889356 DOI: 10.1155/2021/6611126] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/08/2020] [Accepted: 01/23/2021] [Indexed: 12/11/2022]
Abstract
Aging is a natural life process which leads to a gradual decline of essential physiological processes. For the liver, it leads to alterations in histomorphology (steatosis and fibrosis) and function (protein synthesis and energy generation) and affects central hepatocellular processes (autophagy, mitochondrial respiration, and hepatocyte proliferation). These alterations do not only impair the metabolic capacity of the liver but also represent important factors in the pathogenesis of malignant liver disease. Autophagy is a recycling process for eukaryotic cells to degrade dysfunctional intracellular components and to reuse the basic substances. It plays a crucial role in maintaining cell homeostasis and in resisting environmental stress. Emerging evidence shows that modulating autophagy seems to be effective in improving the age-related alterations of the liver. However, autophagy is a double-edged sword for the aged liver. Upregulating autophagy alleviates hepatic steatosis and ROS-induced cellular stress and promotes hepatocyte proliferation but may aggravate hepatic fibrosis. Therefore, a well-balanced autophagy modulation strategy might be suitable to alleviate age-related liver dysfunction. Conclusion. Modulation of autophagy is a promising strategy for "rejuvenation" of the aged liver. Detailed knowledge regarding the most devastating processes in the individual patient is needed to effectively counteract aging of the liver without causing obvious harm.
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Affiliation(s)
- Fengming Xu
- Department of General, Visceral and Vascular Surgery, Jena University Hospital, Jena 07747, Germany
| | - Hans-Michael Tautenhahn
- Department of General, Visceral and Vascular Surgery, Jena University Hospital, Jena 07747, Germany
| | - Olaf Dirsch
- Institute of Pathology, Klinikum Chemnitz gGmbH, Chemnitz 09111, Germany
| | - Uta Dahmen
- Department of General, Visceral and Vascular Surgery, Jena University Hospital, Jena 07747, Germany
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10
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Martinelli I, Timotin A, Moreno-Corchado P, Marsal D, Kramar S, Loy H, Joffre C, Boal F, Tronchere H, Kunduzova O. Galanin promotes autophagy and alleviates apoptosis in the hypertrophied heart through FoxO1 pathway. Redox Biol 2021; 40:101866. [PMID: 33493902 PMCID: PMC7823211 DOI: 10.1016/j.redox.2021.101866] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 01/10/2021] [Accepted: 01/11/2021] [Indexed: 12/12/2022] Open
Abstract
Autophagy and apoptosis are powerful regulators of multiple facets of cellular metabolism and homeostasis. Here, we uncover that galanin, a pleiotropic peptide, regulates cardiac autophagy and deactivates apoptotic cell death through the Forkhead box protein O1 (FoxO1) pathway. In hypertrophied heart, galanin promotes autophagy and metabolic shift from fatty acid (FA) to glucose oxidation and preserves mitochondrial integrity. In cardiomyoblasts, galanin triggers autophagosome formation and alleviates hypertrophy, apoptotic cell death, and mitochondrial stress. Mechanistically, galanin dictates cell autophagic and anti-apoptotic phenotypes through FoxO1 pathway. Together, these findings uncover a previously unknown role for galanin in the regulation of cardiac autophagy and provide new insights into the molecular mechanisms supporting cell survival in the hypertrophic reprogramming of the heart.
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Affiliation(s)
- Ilenia Martinelli
- National Institute of Health and Medical Research (INSERM) U1048, 31432, Toulouse, Cedex 4, France; Paul Sabatier University, 31062, Toulouse, Cedex 9, France
| | - Andrei Timotin
- National Institute of Health and Medical Research (INSERM) U1048, 31432, Toulouse, Cedex 4, France; Paul Sabatier University, 31062, Toulouse, Cedex 9, France
| | - Paula Moreno-Corchado
- National Institute of Health and Medical Research (INSERM) U1048, 31432, Toulouse, Cedex 4, France; Paul Sabatier University, 31062, Toulouse, Cedex 9, France
| | - Dimitri Marsal
- National Institute of Health and Medical Research (INSERM) U1048, 31432, Toulouse, Cedex 4, France; Paul Sabatier University, 31062, Toulouse, Cedex 9, France
| | - Solomiia Kramar
- National Institute of Health and Medical Research (INSERM) U1048, 31432, Toulouse, Cedex 4, France; Paul Sabatier University, 31062, Toulouse, Cedex 9, France
| | - Halina Loy
- National Institute of Health and Medical Research (INSERM) U1048, 31432, Toulouse, Cedex 4, France; Paul Sabatier University, 31062, Toulouse, Cedex 9, France
| | - Carine Joffre
- Paul Sabatier University, 31062, Toulouse, Cedex 9, France; Centre de Recherches en Cancérologie de Toulouse (CRCT), 2 Avenue Hubert Curien, 31037, Toulouse, France
| | - Frederic Boal
- National Institute of Health and Medical Research (INSERM) U1048, 31432, Toulouse, Cedex 4, France; Paul Sabatier University, 31062, Toulouse, Cedex 9, France
| | - Helene Tronchere
- National Institute of Health and Medical Research (INSERM) U1048, 31432, Toulouse, Cedex 4, France; Paul Sabatier University, 31062, Toulouse, Cedex 9, France
| | - Oksana Kunduzova
- National Institute of Health and Medical Research (INSERM) U1048, 31432, Toulouse, Cedex 4, France; Paul Sabatier University, 31062, Toulouse, Cedex 9, France.
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11
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Yuan F, Xu Y, You K, Zhang J, Yang F, Li YX. Calcitriol alleviates ethanol-induced hepatotoxicity via AMPK/mTOR-mediated autophagy. Arch Biochem Biophys 2020; 697:108694. [PMID: 33232716 DOI: 10.1016/j.abb.2020.108694] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 11/04/2020] [Accepted: 11/17/2020] [Indexed: 12/28/2022]
Abstract
Excessive ethanol consumption causes cellular damage, leading to fetal alcohol syndrome and alcohol liver diseases, which are frequently seen with vitamin D (VD) deficiency. A great deal of progress has been achieved in the mechanisms of ethanol-induced hepatocyte damage. However, there are limited intervention means to reduce or rescue hepatocytes damage caused by ethanol. On the basis of our preliminary limited screen process, calcitriol showed a positive effect on protecting hepatocyte viability. Therefore, the molecular basis is worth elucidating. We found that calcitriol pretreatment markedly improved the cell viability, decreased cell apoptosis and oxidative stress and alleviated the abnormal mitochondrial morphology and membrane potential of hepatocytes induced by ethanol. Notably, autophagy was significantly enhanced by calcitriol, as evident by the increasing number of autophagosomes and autolysosomes, upregulated LC3B-Ⅱ and ATG5 levels, and promotion of p62 degradation. Furthermore, calcitriol pretreatment increased the colocalization of GFP-LC3-labeled autophagosomes with mitochondria, suggesting that calcitriol effectively promoted ethanol-induced mitophagy in hepatocytes. In addition, the inhibition of autophagy attenuated the protective and preventive effect of calcitriol. Furthermore, the effect of calcitriol on autophagy was regulated by AMPK/mTOR signaling, and signaling transduction was dependent on the Vitamin D receptor (VDR). In conclusion, calcitriol ameliorates ethanol-induced hepatocyte damage by enhancing autophagy. It may offer a convenient preventive and hepatoprotective mean for people on occasional social drink.
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Affiliation(s)
- Fang Yuan
- School of Life Sciences, University of Science and Technology of China, 230027, Hefei, China; Institute of Public Health, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Guangdong Provincial Key Laboratory of Biocomputing, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China
| | - Yingying Xu
- Institute of Public Health, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Guangdong Provincial Key Laboratory of Biocomputing, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China
| | - Kai You
- Institute of Public Health, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Guangdong Provincial Key Laboratory of Biocomputing, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China
| | - Jiaye Zhang
- Institute of Public Health, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Guangdong Provincial Key Laboratory of Biocomputing, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China
| | - Fan Yang
- Institute of Public Health, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Guangdong Provincial Key Laboratory of Biocomputing, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China
| | - Yin-Xiong Li
- Institute of Public Health, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China; Guangdong Provincial Key Laboratory of Biocomputing, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 510530, Guangzhou, China.
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12
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Adaptive Autophagy Offers Cardiorenal Protection in Rats with Acute Myocardial Infarction. Cardiol Res Pract 2020; 2020:7158975. [PMID: 32655948 PMCID: PMC7322605 DOI: 10.1155/2020/7158975] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 04/14/2020] [Accepted: 05/15/2020] [Indexed: 01/19/2023] Open
Abstract
Objective Understanding the multifactorial changes involved in the kidney and heart after acute myocardial infarction (AMI) is prerequisite for further mechanisms and early intervention, especially autophagy changes. Here, we discussed the role of adaptive autophagy in the heart and kidney of rats with AMI. Methods A rat model of AMI was established by ligating the left anterior descending branch of the coronary artery. Animals were sacrificed at 2 and 4 weeks after the operation to assess the morphological and functional changes of the heart and kidney, as well as the autophagy pathway. In vitro, HK-2 and AC16 cell injuries and the autophagy pathway were assayed after autophagy was inhibited by 3-methyladenine (3-MA) in a hypoxia incubator. Results We found that the left ventricular systolic pressure (LVSP) significantly decreased in the model group at weeks 2 and 4. At weeks 2 and 4, the level of urinary kidney injury molecule 1 (uKIM1) of the model group was significantly higher than the sham group. At week 4, urinary neutrophil gelatinase-associated lipocalcin (uNGAL) and urinary albumin also significantly increased. At week 2, microtubule-associated protein 1 light chain 3-II (LC3-II), ATG5, and Beclin1 were significantly elevated in the heart and kidney compared with the sham-operated rats, but there was no change in p62 levels. At week 4, LC3-II did not significantly increase and p62 levels significantly increased. In addition, 3-MA markedly increased KIM1, NGAL, and the activity of caspase-3 in the hypoxic HK-2 and AC16 cell. Conclusion Autophagy will undergo adaptive changes and play a protective role in the heart and kidney of rats after AMI.
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13
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Al-Bari MAA, Xu P. Molecular regulation of autophagy machinery by mTOR-dependent and -independent pathways. Ann N Y Acad Sci 2020; 1467:3-20. [PMID: 31985829 DOI: 10.1111/nyas.14305] [Citation(s) in RCA: 162] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Revised: 11/23/2019] [Accepted: 01/07/2020] [Indexed: 12/15/2022]
Abstract
Macroautophagy is a lysosomal degradative pathway or recycling process that maintains cellular homeostasis. This autophagy involves a series of sequential processing events, such as initiation; elongation and nucleation of the isolation membrane; cargo recruitment and maturation of the autophagosome (AP); transport of the AP; docking and fusion of the AP with a late endosome or lysosome; and regeneration of the lysosome by the autophagic lysosomal reformation cycle. These events are critically coordinated by the action of a set of several key components, including autophagy-related proteins (Atg), and regulated by intricate networks, such as mechanistic target of rapamycin (mTOR), a master regulator of autophagy, as well as mTOR-independent signaling pathways. Among mTOR-independent pathways, the transient receptor potential (TRP) calcium ion channel TRPML (mucolipin) subfamily is emerging as an important signaling channel to modulate lysosomal biogenesis and autophagy. This review discusses the recent advances in elucidating the molecular mechanisms and regulation of the autophagy process. Understanding these mechanisms may ultimately allow scientists and clinicians to control this process in order to improve human health.
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Affiliation(s)
| | - Pingyong Xu
- Key Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,Beijing Key Laboratory of Noncoding RNA, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
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14
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Cohen A, Angoulvant D. Cardiomyopathie du diabétique, dépistage et épidémiologie. ARCHIVES OF CARDIOVASCULAR DISEASES SUPPLEMENTS 2019. [DOI: 10.1016/s1878-6480(19)30963-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Meng T, Lin S, Zhuang H, Huang H, He Z, Hu Y, Gong Q, Feng D. Recent progress in the role of autophagy in neurological diseases. Cell Stress 2019; 3:141-161. [PMID: 31225510 PMCID: PMC6551859 DOI: 10.15698/cst2019.05.186] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Autophagy (here refers to macroautophagy) is a catabolic pathway by which large protein aggregates and damaged organelles are first sequestered into a double-membraned structure called autophago-some and then delivered to lysosome for destruction. Recently, tremen-dous progress has been made to elucidate the molecular mechanism and functions of this essential cellular metabolic process. In addition to being either a rubbish clearing system or a cellular surviving program in response to different stresses, autophagy plays important roles in a large number of pathophysiological conditions, such as cancer, diabetes, and especially neurodegenerative disorders. Here we review recent progress in the role of autophagy in neurological diseases and discuss how dysregulation of autophagy initiation, autophagosome formation, maturation, and/or au-tophagosome-lysosomal fusion step contributes to the pathogenesis of these disorders in the nervous system.
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Affiliation(s)
- Tian Meng
- State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University; Affiliated Cancer Hospital of Guangzhou Medical University, Guangzhou 511436, China
| | - Shiyin Lin
- State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University; Affiliated Cancer Hospital of Guangzhou Medical University, Guangzhou 511436, China
| | - Haixia Zhuang
- State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University; Affiliated Cancer Hospital of Guangzhou Medical University, Guangzhou 511436, China
| | - Haofeng Huang
- Institute of Neurology, Guangdong Key Laboratory of Age-Related Cardiac-Cerebral Vascular Disease, Affiliated Hospital of Guangdong Medical College, Zhanjiang, Guangdong, China
| | - Zhengjie He
- State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University; Affiliated Cancer Hospital of Guangzhou Medical University, Guangzhou 511436, China
| | - Yongquan Hu
- State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University; Affiliated Cancer Hospital of Guangzhou Medical University, Guangzhou 511436, China
| | - Qing Gong
- Department of Biochemistry and Molecular Biology, GMU-GIBH Joint School of Life Sciences, Guangzhou Medical University, Guangzhou 511436, People's Republic of China
| | - Du Feng
- State Key Laboratory of Respiratory Disease, School of Basic Medical Sciences, Guangzhou Medical University; Affiliated Cancer Hospital of Guangzhou Medical University, Guangzhou 511436, China
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16
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Iron induces insulin resistance in cardiomyocytes via regulation of oxidative stress. Sci Rep 2019; 9:4668. [PMID: 30874600 PMCID: PMC6420583 DOI: 10.1038/s41598-019-41111-6] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 02/12/2019] [Indexed: 12/26/2022] Open
Abstract
Iron overload is associated with various pathological changes which contribute to heart failure. Here, we examined mechanisms via which iron alters cardiomyocyte insulin sensitivity. Treatment of primary adult and neonatal cardiomyocytes as well as H9c2 cells with iron decreased insulin sensitivity determined via Western blotting or immunofluorescent detection of Akt and p70S6K phosphorylation and glucose uptake. Using CellROX deep red or DCF-DA probes we also observed that iron increased generation of reactive oxygen species (ROS), and that pretreatment with the superoxide dismutase mimetic MnTBAP reduced ROS production and attenuated iron-induced insulin resistance. SKQ1 and allopurinol but not apocynin reduced iron-induced ROS suggesting mitochondria and xanthine oxidase contribute to cellular ROS in response to iron. Western blotting for LC3-I, LC3-II and P62 levels as well as immunofluorescent co-detection of autophagosomes with Cyto-ID and lysosomal cathepsin activity indicated that iron attenuated autophagic flux without altering total expression of Atg7 or beclin-1 and phosphorylation of mTORC1 and ULK1. This conclusion was reinforced via protein accumulation detected using Click-iT HPG labelling after iron treatment. The adiponectin receptor agonist AdipoRon increased autophagic flux and improved insulin sensitivity both alone and in the presence of iron. We created an autophagy-deficient cell model by overexpressing a dominant-negative Atg5 mutant in H9c2 cells and this confirmed that reduced autophagy flux correlated with less insulin sensitivity. In conclusion, our study showed that iron promoted a cascade of ROS production, reduced autophagy and insulin resistance in cardiomyocytes.
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17
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Zhang Y, Whaley-Connell AT, Sowers JR, Ren J. Autophagy as an emerging target in cardiorenal metabolic disease: From pathophysiology to management. Pharmacol Ther 2018; 191:1-22. [PMID: 29909238 PMCID: PMC6195437 DOI: 10.1016/j.pharmthera.2018.06.004] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 06/05/2018] [Indexed: 12/16/2022]
Abstract
Although advances in medical technology and health care have improved the early diagnosis and management for cardiorenal metabolic disorders, the prevalence of obesity, insulin resistance, diabetes, hypertension, dyslipidemia, and kidney disease remains high. Findings from numerous population-based studies, clinical trials, and experimental evidence have consolidated a number of theories for the pathogenesis of cardiorenal metabolic anomalies including resistance to the metabolic action of insulin, abnormal glucose and lipid metabolism, oxidative and nitrosative stress, endoplasmic reticulum (ER) stress, apoptosis, mitochondrial damage, and inflammation. Accumulating evidence has recently suggested a pivotal role for proteotoxicity, the unfavorable effects of poor protein quality control, in the pathophysiology of metabolic dysregulation and related cardiovascular complications. The ubiquitin-proteasome system (UPS) and autophagy-lysosomal pathways, two major although distinct cellular clearance machineries, govern protein quality control by degradation and clearance of long-lived or damaged proteins and organelles. Ample evidence has depicted an important role for protein quality control, particularly autophagy, in the maintenance of metabolic homeostasis. To this end, autophagy offers promising targets for novel strategies to prevent and treat cardiorenal metabolic diseases. Targeting autophagy using pharmacological or natural agents exhibits exciting new strategies for the growing problem of cardiorenal metabolic disorders.
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Affiliation(s)
- Yingmei Zhang
- Shanghai Institute of Cardiovascular Diseases, Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai 200032, China; Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA.
| | - Adam T Whaley-Connell
- Research Service, Harry S Truman Memorial Veterans' Hospital, University of Missouri-Columbia School of Medicine, Columbia, MO, USA; Diabetes and Cardiovascular Center, Department of Medicine, University of Missouri-Columbia School of Medicine, Columbia, MO, USA
| | - James R Sowers
- Research Service, Harry S Truman Memorial Veterans' Hospital, University of Missouri-Columbia School of Medicine, Columbia, MO, USA; Diabetes and Cardiovascular Center, Department of Medicine, University of Missouri-Columbia School of Medicine, Columbia, MO, USA
| | - Jun Ren
- Shanghai Institute of Cardiovascular Diseases, Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai 200032, China; Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA.
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18
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Yuan J, Zhao X, Hu Y, Sun H, Gong G, Huang X, Chen X, Xia M, Sun C, Huang Q, Sun Y, Kong W, Kong W. Autophagy regulates the degeneration of the auditory cortex through the AMPK-mTOR-ULK1 signaling pathway. Int J Mol Med 2018; 41:2086-2098. [PMID: 29344647 PMCID: PMC5810242 DOI: 10.3892/ijmm.2018.3393] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 01/10/2018] [Indexed: 01/07/2023] Open
Abstract
Presbycusis is the most common sensory impairment associated with aging; however, the underlying molecular mechanism remains unclear. Autophagy has been demonstrated to serve a key role in diverse diseases; however, no studies have examined its function in central presbycusis. The aim of the present study was to investigate the changes of autophagy in the physiological processes of the auditory cortex and its role in the degeneration of the auditory cortex, as well as the related mechanisms using naturally aging rats and a D‑galactose (D‑gal)‑induced mimetic rat model of aging. The present study demonstrated that autophagy increased from 3 months to 15 months in the normal saline (NS) control group, while it decreased in the D‑gal group. Compared with the age‑matched NS group, the D‑gal group demonstrated significantly increased levels of the autophagy‑related proteins, LC3 and Beclin 1 (BECN1) and the anti‑apoptotic proteins B‑cell lymphoma (BCL)2 and BCL‑extra large (BCL‑xL) at 3 months, with no obvious changes in cell apoptosis level and neuron ultrastructural morphology. However, LC3, BECN1, BCL2 and BCL‑xL were decreased at 15 months in the D-gal group, with cell apoptosis significantly increased and substantial neuron degeneration. Additionally, 5' AMP‑activated protein kinase (AMPK) activity was enhanced, and mechanistic target of rapamycin (mTOR) and ULK1 phosphorylation (Ser 757) activities were inhibited at 3 months compared with those of the NS group, while the opposite was observed at 9 and 15 months. The present results suggested that autophagy increases from young to adult and decreases at old age in the physiological processes of the auditory cortex, and has anti‑apoptotic as well as anti‑aging functions in the degeneration of the auditory cortex. Additionally, autophagy was regulated through AMPK activation and mTOR suppression, and impairment of autophagy may serve a key role in the degeneration of the auditory cortex, even in the pathogenesis of central presbycusis.
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Affiliation(s)
- Jie Yuan
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022
| | - Xueyan Zhao
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022
| | - Yujuan Hu
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022
| | - Haiying Sun
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022
| | - Guoqing Gong
- Department of Otolaryngology, Central Hospital of Huangshi, Huangshi, Hubei 435000
| | | | - Xubo Chen
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022
| | - Mingyu Xia
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022
| | - Chen Sun
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022
| | - Qilin Huang
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022
| | - Yu Sun
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022
| | - Wen Kong
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China,Correspondence to: Professor Wen Kong, Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, Hubei 430022, P.R. China, E-mail:
| | - Weijia Kong
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022,Institute of Otorhinolaryngology,Professor Weijia Kong, Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue Wuhan, Hubei 430022, P.R. China, E-mail:
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Cao J, Chen H, Lu W, Wu Y, Wu X, Xia D, Zhu J. Myricetin Induces Protective Autophagy by Inhibiting the Phosphorylation of mTOR in HepG2 Cells. Anat Rec (Hoboken) 2017; 301:786-795. [PMID: 29244256 DOI: 10.1002/ar.23754] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Revised: 07/30/2017] [Accepted: 08/12/2017] [Indexed: 12/26/2022]
Affiliation(s)
- Jianping Cao
- Institute of Immunology, School of Medicine, Zhejiang University; Hangzhou Zhejiang Province China
- Department of Blood Transfusion, the First Affiliated Hospital, School of Medicine; Zhejiang University; Hangzhou Zhejiang Province China
| | - Hanwen Chen
- Department of Toxicology, School of Public Health; Zhejiang University; Hangzhou Zhejiang Province China
| | - Wei Lu
- Department of Toxicology, School of Public Health; Zhejiang University; Hangzhou Zhejiang Province China
| | - Yihua Wu
- Department of Toxicology, School of Public Health; Zhejiang University; Hangzhou Zhejiang Province China
| | - Xia Wu
- Department of Dermatology, Sir Run Run Shaw Hospital, School of Medicine; Zhejiang University; Hangzhou Zhejiang Province China
| | - Dajing Xia
- Department of Toxicology, School of Public Health; Zhejiang University; Hangzhou Zhejiang Province China
| | - Jiang Zhu
- Department of Dermatology, Sir Run Run Shaw Hospital, School of Medicine; Zhejiang University; Hangzhou Zhejiang Province China
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Papadakis E, Kanakis M, Kataki A, Spandidos DA. The spectrum of myocardial homeostasis mechanisms in the settings of cardiac surgery procedures (Review). Mol Med Rep 2017; 17:2089-2099. [PMID: 29207125 PMCID: PMC5783448 DOI: 10.3892/mmr.2017.8174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 11/28/2017] [Indexed: 12/13/2022] Open
Abstract
Classic cardiac surgery, determined through the function of cardiopulmonary bypass machine and myocardial cardioplegic arrest, represents the most controlled scenario for cardiomyocyte homeostatic disturbances due to systemic inflammatory response and myocardial reperfusion injury. An increasing number of studies have demonstrated that myocardial cell homeostasis in cardiac surgery procedures is a sequence of molecularly interrelated and overlapping mechanisms in the form of apoptosis, autophagy and necrosis, which are activated by a plethora of induced inflammatory mediators and gene-related signaling pathways. In this study, we outline the molecular mechanisms of the cardiomyocyte adaptive homeostatic process and the associated clinical implications, in the settings of classic cardiac surgery procedures.
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Affiliation(s)
- Emmanuel Papadakis
- Department of Cardiac Surgery, Onassis Cardiac Surgery Center, 17674 Athens, Greece
| | - Meletios Kanakis
- Cardiothoracic Surgery Unit, Great Ormond Street Hospital for Children, WC1N 3JH London, UK
| | - Agapi Kataki
- Propaedeutic Surgery First Department, University of Athens, 11527 Athens, Greece
| | - Demetrios A Spandidos
- Laboratory of Clinical Virology, Medical School, University of Crete, 71003 Heraklion, Crete, Greece
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21
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Yang M, Hao Y, Gao J, Zhang Y, Xu W, Tao L. Spinosad induces autophagy of Spodoptera frugiperda Sf9 cells and the activation of AMPK/mTOR signaling pathway. Comp Biochem Physiol C Toxicol Pharmacol 2017; 195:52-59. [PMID: 28223193 DOI: 10.1016/j.cbpc.2017.02.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 02/16/2017] [Accepted: 02/16/2017] [Indexed: 10/20/2022]
Abstract
Spinosad, a high-selectivity neural toxin, has been widely used in agricultural production. However, the mode of action of spinosad on insect non-neural cells is not yet clear and hence requires further investigation. Therefore, to reveal the cytotoxic mechanisms of spinosad, we investigated whether and how it can induce autophagic cell death. After treating Sf9 cells with spinosad, the resulting autophagosome was observed by transmission electron microscopy and monodansylcadaverine staining. Interestingly, spinosad induced the accumulation of Beclin-1, degradation of p62, and intensification of LC3-B formation and translocation and thus autophagy, whereas, 3-MA treatment reverted the phenotype. Under ATP depletion conditions, spinosad induced autophagy of Sf9 cells and activation of the AMPK/mTOR signaling pathway.
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Affiliation(s)
- Mingjun Yang
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Youwu Hao
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Jufang Gao
- College of Life and Environmental Sciences, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, China
| | - Yang Zhang
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Wenping Xu
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Liming Tao
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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22
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Yin Y, Sun G, Li E, Kiselyov K, Sun D. ER stress and impaired autophagy flux in neuronal degeneration and brain injury. Ageing Res Rev 2017; 34:3-14. [PMID: 27594375 DOI: 10.1016/j.arr.2016.08.008] [Citation(s) in RCA: 150] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 08/31/2016] [Indexed: 12/12/2022]
Abstract
Autophagy is a highly controlled lysosome-mediated function in eukaryotic cells to eliminate damaged or aged long-lived proteins and organelles. It is required for restoring cellular homeostasis in cell survival under multiple stresses. Autophagy is known to be a double-edged sword because too much activation or inhibition of autophagy can disrupt homeostatic degradation of protein and organelles within the brain and play a role in neuronal cell death. Many factors affect autophagy flux function in the brain, including endoplasmic reticulum (ER) stress, oxidative stress, and aging. Newly emerged research indicates that altered autophagy flux functionality is involved in neurodegeneration of the aged brain, chronic neurological diseases, and after traumatic and ischemic brain injuries. In search to identify neuroprotective agents that may reduce oxidative stress and stimulate autophagy, one particular neuroprotective agent docosahexaenoic acid (DHA) presents unique functions in reducing ER and oxidative stress and modulating autophagy. This review will summarize the recent findings on changes of autophagy in aging, neurodegenerative diseases, and brain injury after trauma or ischemic strokes. Discussion of DHA functions is focused on modulating ER stress and autophagy in regard to its neuroprotection and anti-tumor functions.
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Affiliation(s)
- Yan Yin
- Department of Neurology, The Second Hospital of Dalian Medical University, Dalian 116023, PR China; Department of Neurology, University of Pittsburgh, Pittsburgh, PA 15213, United States.
| | - George Sun
- Department of Neurology, University of Pittsburgh, Pittsburgh, PA 15213, United States
| | - Eric Li
- Department of Neurology, University of Pittsburgh, Pittsburgh, PA 15213, United States
| | - Kirill Kiselyov
- Department of Biological Science, University of Pittsburgh, Pittsburgh, PA 15213, United States
| | - Dandan Sun
- Department of Neurology, University of Pittsburgh, Pittsburgh, PA 15213, United States; Veterans Affairs Pittsburgh Health Care System, Geriatric Research, Education and Clinical Center, Pittsburgh, PA 15213, United States.
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Zhang YY, Gong JP, Li ZM. Autophagy and hepatic lipid metabolism. Shijie Huaren Xiaohua Zazhi 2017; 25:491-497. [DOI: 10.11569/wcjd.v25.i6.491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Autophagy is initially thought to be a non-selective process in which intracellular proteins or damaged organelles are degraded. It is activated when cells lack nutrients and energy. Autophagy degrades cytoplasmic components within lysosomes and reuses the energy of amino acids to promote cell survival and maintain the cytoplasmic content. Current evidence implicates autophagy in the regulation of lipid stores within the two main organs involved in maintaining lipid homeostasis, the liver and adipose tissue. Upregulation of autophagy may lead to conversion of white adipose tissue into brown adipose tissue, thus regulating energy expenditure and obesity. Discovering new therapeutic interventions to treat lipid and lipoprotein disorders is of great interest and the discovery of autophagy as a regulator of lipid metabolism has opened up a new avenue for this area. In the liver, autophagy can play a role in some common metabolic disorders, which needs further research.
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Xu Z, Yan Y, Qian L, Gong Z. Long non-coding RNAs act as regulators of cell autophagy in diseases (Review). Oncol Rep 2017; 37:1359-1366. [PMID: 28184916 PMCID: PMC5364869 DOI: 10.3892/or.2017.5416] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 01/27/2017] [Indexed: 02/07/2023] Open
Abstract
Identification of long non-coding RNAs (lncRNAs) has provided a substantial increase in our understanding of the non-coding transcriptome. Studies have revealed a crucial function of lncRNAs in the modulation of cell autophagy in vitro and in vivo, further contributing to the hallmarks of disease phenotypes. These findings have profoundly altered our understanding of disease pathobiology, and may lead to the emergence of new biological concepts underlying autophagy-associated diseases, such as the carcinomas. Studies on the molecular mechanism of the lncRNA-autophagy axis may offer additional avenues for therapeutic intervention and biomarker assessment. In this review, we discuss recent findings on the multiple molecular roles of regulatory lncRNAs in the signaling pathways of cell autophagy. The emerging knowledge in this rapidly advancing field will offer novel insights into human diseases, especially cancers.
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Affiliation(s)
- Zhijie Xu
- Department of Pathology, Xiangya Hospital, Changsha, Hunan 410008, P.R. China
| | - Yuanliang Yan
- Department of Pharmacy, Xiangya Hospital, Changsha, Hunan 410008, P.R. China
| | - Long Qian
- Department of Pharmacy, Xiangya Hospital, Changsha, Hunan 410008, P.R. China
| | - Zhicheng Gong
- Department of Pharmacy, Xiangya Hospital, Changsha, Hunan 410008, P.R. China
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25
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Wan W, Jin L, Wang Z, Wang L, Fei G, Ye F, Pan X, Wang C, Zhong C. Iron Deposition Leads to Neuronal α-Synuclein Pathology by Inducing Autophagy Dysfunction. Front Neurol 2017; 8:1. [PMID: 28138322 PMCID: PMC5237641 DOI: 10.3389/fneur.2017.00001] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 01/04/2017] [Indexed: 11/13/2022] Open
Abstract
Growing evidence has indicated that iron deposition in the substantia nigra plays an important role in Parkinson’s disease (PD). However, the underlying mechanism is still elusive. Using primary dopaminergic neurons and SH-SY5Y cells cultured in vitro, we observed that iron loading increased α-synuclein and reactive oxygen species (ROS) levels in these cells but did not affect the intracellular α-synuclein mRNA levels. Furthermore, iron loading significantly downregulated Beclin-1 levels and decreased the ratio of microtubule-associated protein 1 light chain 3 isoforms (LC3 II/LC3 I). However, a significant change in the levels of autophagy-related gene 5 (Atg5) was not observed in either neurons or SH-SY5Y cells after iron treatment. After treatment with rapamycin, the iron loading-induced increase in the α-synuclein level was significantly reversed and ROS generation was alleviated in both cultured neurons and SH-SY5Y cells. These results indicate that the inhibition of autophagy is critical for the pathological alterations in α-synuclein induced by iron loading. Moreover, treatment with vitamin E did not affect the increase in the α-synuclein levels but significantly eliminated the iron-induced ROS production. Together, our study shows that autophagy dysfunction contributes to iron-induced α-synuclein pathology.
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Affiliation(s)
- Wenbin Wan
- Department of Neurology, Zhongshan Hospital, Fudan University , Shanghai , China
| | - Lirong Jin
- Department of Neurology, Zhongshan Hospital, Fudan University , Shanghai , China
| | - Zigao Wang
- Department of Neurology, Zhongshan Hospital, Fudan University, Shanghai, China; Department of Neurology, Jingshan Hospital, Fudan University, Shanghai, China
| | - Lingyan Wang
- Experimental Research Center, Zhongshan Hospital, Fudan University , Shanghai , China
| | - Guoqiang Fei
- Department of Neurology, Zhongshan Hospital, Fudan University , Shanghai , China
| | - Fanlong Ye
- Department of Neurology, Zhongshan Hospital, Fudan University , Shanghai , China
| | - Xiaoli Pan
- Department of Neurology, Zhongshan Hospital, Fudan University , Shanghai , China
| | - Changpeng Wang
- Department of Neurology, Zhongshan Hospital, Fudan University , Shanghai , China
| | - Chunjiu Zhong
- Department of Neurology, Zhongshan Hospital, Fudan University , Shanghai , China
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Jia G, Jia Y, Sowers JR. Contribution of Maladaptive Adipose Tissue Expansion to Development of Cardiovascular Disease. Compr Physiol 2016; 7:253-262. [PMID: 28135006 DOI: 10.1002/cphy.c160014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The overweight and obesity epidemic has led to an increase in the metabolic syndrome and associated cardiovascular disease (CVD). These abnormalities include insulin resistance, type 2 diabetes mellitus, vascular stiffness, hypertension, stroke, and coronary heart disease. Visceral white adipocyte tissue (WAT) expansion and associated fibrosis/stiffness of WAT promote insulin resistance and CVD through increases in proinflammatory adipokines, oxidative stress, activation of renin-angiotensin-aldosterone system, dysregulation of adipocyte apoptosis and autophagy, dysfunctional immune modulation, and adverse changes in the gut microbiome. The expansion of WAT is partly determined by activation of peroxisome proliferator-activated receptor gamma and mammalian target of rapamycin/ribosomal S6 kinase signaling pathways. Further, the chronic activation of these signaling pathways may not only induce adipocyte hypertrophy and fibrosis, but also contribute to systemic inflammation, and impairment of insulin metabolic signaling in fat, liver, and skeletal muscle tissue. Therefore, the interplay of adipocyte dysfunction, maladaptive immune and inflammatory responses, and associated metabolic disorders often coexist leading to systemic low-grade inflammation and insulin resistance that are associated with increased CVD in obese individuals. © 2017 American Physiological Society. Compr Physiol 7:253-262, 2017.
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Affiliation(s)
- Guanghong Jia
- Diabetes and Cardiovascular Research Center, University of Missouri School of Medicine, Columbia, Missouri, USA.,Harry S. Truman Memorial Veterans Hospital, Columbia, Missouri, USA
| | - Yan Jia
- Diabetes and Cardiovascular Research Center, University of Missouri School of Medicine, Columbia, Missouri, USA
| | - James R Sowers
- Diabetes and Cardiovascular Research Center, University of Missouri School of Medicine, Columbia, Missouri, USA.,Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, Missouri, USA.,Dalton Cardiovascular Center, University of Missouri School of Medicine, Columbia, Missouri, USA.,Harry S. Truman Memorial Veterans Hospital, Columbia, Missouri, USA
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27
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Zhou L, Ma B, Han X. The role of autophagy in angiotensin II-induced pathological cardiac hypertrophy. J Mol Endocrinol 2016; 57:R143-R152. [PMID: 27620875 DOI: 10.1530/jme-16-0086] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Accepted: 09/12/2016] [Indexed: 12/18/2022]
Abstract
Pathological cardiac hypertrophy is associated with nearly all forms of heart failure. It develops in response to disorders such as coronary artery disease, hypertension and myocardial infarction. Angiotensin II (Ang II) has direct effects on the myocardium and promotes hypertension. Chronic elevation of Ang II can lead to pathological cardiac hypertrophy and cardiac failure. Autophagy is an important process in the pathogenesis of cardiovascular diseases. Under physiological conditions, autophagy is an essential homeostatic mechanism to maintain the global cardiac structure function by ridding damaged cells or unwanted macromolecules and organelles. Dysregulation of autophagy may play an important role in Ang II-induced cardiac hypertrophy although conflicting reports on the effects of Ang II on autophagy and cardiac hypertrophy exist. Some studies showed that autophagy activation attenuated Ang II-induced cardiac dysfunction. Others suggested that inhibition of the Ang II induced autophagy should be protective. The discrepancies may be due to different model systems and different signaling pathway involved. Ang II-induced cardiac hypertrophy may be alleviated through regulation of autophagy. This review focuses on Ang II to highlight the molecular targets and pathways identified in the prevention and treatment of Ang II-induced pathological cardiac hypertrophy by regulating autophagy.
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Affiliation(s)
- Lichun Zhou
- Department of PharmacologySchool of Pharmaceutical Sciences, Shandong University, Jinan, Shandong Province, China
| | - Baohua Ma
- Pharmaceutical Preparation SectionCentral Hospital of Qingdao, Qingdao, Shandong Province, China
| | - Xiuzhen Han
- Department of PharmacologySchool of Pharmaceutical Sciences, Shandong University, Jinan, Shandong Province, China
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Vaiserman AM, Lushchak OV, Koliada AK. Anti-aging pharmacology: Promises and pitfalls. Ageing Res Rev 2016; 31:9-35. [PMID: 27524412 DOI: 10.1016/j.arr.2016.08.004] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Revised: 08/06/2016] [Accepted: 08/09/2016] [Indexed: 12/12/2022]
Abstract
Life expectancy has grown dramatically in modern times. This increase, however, is not accompanied by the same increase in healthspan. Efforts to extend healthspan through pharmacological agents targeting aging-related pathological changes are now in the spotlight of geroscience, the main idea of which is that delaying of aging is far more effective than preventing the particular chronic disorders. Currently, anti-aging pharmacology is a rapidly developing discipline. It is a preventive field of health care, as opposed to conventional medicine which focuses on treating symptoms rather than root causes of illness. A number of pharmacological agents targeting basic aging pathways (i.e., calorie restriction mimetics, autophagy inducers, senolytics etc.) are now under investigation. This review summarizes the literature related to advances, perspectives and challenges in the field of anti-aging pharmacology.
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Affiliation(s)
| | - Oleh V Lushchak
- Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
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N-Acetylcysteine in Combination with IGF-1 Enhances Neuroprotection against Proteasome Dysfunction-Induced Neurotoxicity in SH-SY5Y Cells. PARKINSONS DISEASE 2016; 2016:6564212. [PMID: 27774335 PMCID: PMC5059605 DOI: 10.1155/2016/6564212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 08/19/2016] [Accepted: 08/28/2016] [Indexed: 11/17/2022]
Abstract
Ubiquitin proteasome system (UPS) dysfunction has been implicated in the development of many neuronal disorders, including Parkinson's disease (PD). Previous studies focused on individual neuroprotective agents and their respective abilities to prevent neurotoxicity following a variety of toxic insults. However, the effects of the antioxidant N-acetylcysteine (NAC) on proteasome impairment-induced apoptosis have not been well characterized in human neuronal cells. The aim of this study was to determine whether cotreatment of NAC and insulin-like growth factor-1 (IGF-1) efficiently protected against proteasome inhibitor-induced cytotoxicity in SH-SY5Y cells. Our results demonstrate that the proteasome inhibitor, MG132, initiates poly(ADP-ribose) polymerase (PARP) cleavage, caspase 3 activation, and nuclear condensation and fragmentation. In addition, MG132 treatment leads to endoplasmic reticulum (ER) stress and autophagy-mediated cell death. All of these events can be attenuated without obvious reduction of MG132 induced protein ubiquitination by first treating the cells with NAC and IGF-1 separately or simultaneously prior to exposure to MG132. Moreover, our data demonstrated that the combination of the two proved to be significantly more effective for neuronal protection. Therefore, we conclude that the simultaneous use of growth/neurotrophic factors and a free radical scavenger may increase overall protection against UPS dysfunction-mediated cytotoxicity and neurodegeneration.
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Thiamine Deficiency and Neurodegeneration: the Interplay Among Oxidative Stress, Endoplasmic Reticulum Stress, and Autophagy. Mol Neurobiol 2016; 54:5440-5448. [PMID: 27596507 DOI: 10.1007/s12035-016-0079-9] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 08/23/2016] [Indexed: 12/12/2022]
Abstract
Thiamine (vitamin B1) is an essential nutrient and indispensable for normal growth and development of the organism due to its multilateral participation in key biochemical and physiological processes. Humans must obtain thiamine from their diet since it is synthesized only in bacteria, fungi, and plants. Thiamine deficiency (TD) can result from inadequate intake, increased requirement, excessive deletion, and chronic alcohol consumption. TD affects multiple organ systems, including the cardiovascular, muscular, gastrointestinal, and central and peripheral nervous systems. In the brain, TD causes a cascade of events including mild impairment of oxidative metabolism, neuroinflammation, and neurodegeneration, which are commonly observed in neurodegenerative diseases, such as Alzheimer's disease (AD), Parkinson's disease (PD), and Huntington's disease (HD). Thiamine metabolites may serve as promising biomarkers for neurodegenerative diseases, and thiamine supplementations exhibit therapeutic potential for patients of some neurodegenerative diseases. Experimental TD has been used to model aging-related neurodegenerative diseases. However, to date, the cellular and molecular mechanisms underlying TD-induced neurodegeneration are not clear. Recent research evidence indicates that TD causes oxidative stress, endoplasmic reticulum (ER) stress, and autophagy in the brain, which are known to contribute to the pathogenesis of various neurodegenerative diseases. In this review, we discuss the role of oxidative stress, ER stress, and autophagy in TD-mediated neurodegeneration. We propose that it is the interplay of oxidative stress, ER stress, and autophagy that contributes to TD-mediated neurodegeneration.
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Liu HZ, Tao YX, Luo P, Deng CM, Gu YP, Yang L, Zhong JP. Preventive Effects of a Novel Polysaccharide from Sepia esculenta Ink on Ovarian Failure and Its Action Mechanisms in Cyclophosphamide-Treated Mice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:5759-5766. [PMID: 27337058 DOI: 10.1021/acs.jafc.6b01854] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
On the basis of our findings about chemo-preventive roles of squid ink polysaccharide and the well-known toxicity of cyclophosphamide (CP) on female gonad, this research investigated the protective effects of a novel polysaccharide from Sepia esculenta ink (SEP) on the ovarian failure resulting from CP, as well as the action mechanisms underpinning this. The results indicated that CP destroyed the ovaries of mice which caused depletion of various follicles, and led to a reduction in estradiol content, increases in FSH and LH contents in sera, decreases in ovary and uterus masses and their relative mass ratios, disruption of the ultrastructure of granulosa cells, as well as induction of apoptosis and autophagy via p38 MAPK and PI3K/Akt signaling pathways. The phenomenon resulted in ovarian failure. However, SEP exposure altered the negative effects completely. The data indicated that SEP can effectively prevent ovarian failure CP caused in mice by inhibiting the p38 MAPK signaling pathway and activating the PI3K/Akt signaling pathway as regulated by CP. SEP was a novel polysaccharide from Sepia esculenta ink with a unique primary structure mainly composed of GalN and Ara that accounted for almost half of all monosaccharides: their ratio was nearly one-to-one. Besides, the polysaccharide contained a small number of Fuc and tiny amounts of Man, GlcN, GlcA, and GalA.
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Affiliation(s)
- Hua-Zhong Liu
- College of Sciences, Guangdong Ocean University , Zhanjiang 524088, China
| | - Ye-Xing Tao
- Science Experiment Center, Guilin Medical University , Guilin 541004, China
| | - Ping Luo
- College of Sciences, Guangdong Ocean University , Zhanjiang 524088, China
| | - Chun-Mei Deng
- College of Sciences, Guangdong Ocean University , Zhanjiang 524088, China
| | - Yi-Peng Gu
- Institute of Food Science & Engineering Technology, Hezhou University , Hezhou 542899, China
| | - Lei Yang
- College of Sciences, Guangdong Ocean University , Zhanjiang 524088, China
| | - Jie-Ping Zhong
- College of Sciences, Guangdong Ocean University , Zhanjiang 524088, China
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32
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Chan YK, Sung HK, Jahng JWS, Kim GHE, Han M, Sweeney G. Lipocalin-2 inhibits autophagy and induces insulin resistance in H9c2 cells. Mol Cell Endocrinol 2016; 430:68-76. [PMID: 27090568 DOI: 10.1016/j.mce.2016.04.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 04/05/2016] [Accepted: 04/13/2016] [Indexed: 01/08/2023]
Abstract
Lipocalin-2 (Lcn2; also known as neutrophil gelatinase associated lipocalin, NGAL) levels are increased in obesity and diabetes and associate with insulin resistance. Correlations exist between Lcn2 levels and various forms or stages of heart failure. Insulin resistance and autophagy both play well-established roles in cardiomyopathy. However, little is known about the impact of Lcn2 on insulin signaling in cardiomyocytes. In this study, we treated H9c2 cells with recombinant Lcn2 for 1 h followed by dose- and time-dependent insulin treatment and found that Lcn2 attenuated insulin signaling assessed via phosphorylation of Akt and p70S6K. We used multiple assays to demonstrate that Lcn2 reduced autophagic flux. First, Lcn2 reduced pULK1 S555, increased pULK1 S757 and reduced LC3-II levels determined by Western blotting. We validated the use of DQ-BSA to assess autolysosomal protein degradation and this together with MagicRed cathepsin B assay indicated that Lcn2 reduced lysosomal degradative activity. Furthermore, we generated H9c2 cells stably expressing tandem fluorescent RFP/GFP-LC3 and this approach verified that Lcn2 decreased autophagic flux. We also created an autophagy-deficient H9c2 cell model by overexpressing a dominant-negative Atg5 mutant and found that reduced autophagy levels also induced insulin resistance. Adding rapamycin after Lcn2 could stimulate autophagy and recover insulin sensitivity. In conclusion, our study indicated that acute Lcn2 treatment caused insulin resistance and use of gain and loss of function approaches elucidated a causative link between autophagy inhibition and regulation of insulin sensitivity by Lcn2.
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Affiliation(s)
- Yee Kwan Chan
- Department of Biology, York University, Toronto, ON, M3J 1P3, Canada
| | - Hye Kyoung Sung
- Department of Biology, York University, Toronto, ON, M3J 1P3, Canada
| | | | - Grace Ha Eun Kim
- Department of Biology, York University, Toronto, ON, M3J 1P3, Canada
| | - Meng Han
- Department of Biology, York University, Toronto, ON, M3J 1P3, Canada
| | - Gary Sweeney
- Department of Biology, York University, Toronto, ON, M3J 1P3, Canada.
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Abstract
Many common renal insults such as ischemia and toxic injury primarily target the tubular epithelial cells, especially the highly metabolically active proximal tubular segment. Tubular epithelial cells are particularly dependent on autophagy to maintain homeostasis and respond to stressors. The pattern of autophagy in the kidney has a unique spatial and chronologic signature. Recent evidence has shown that there is complex cross-talk between autophagy and various cell death pathways. This review specifically discusses the interplay between autophagy and cell death in the renal tubular epithelia. It is imperative to review this topic because recent discoveries have improved our mechanistic understanding of the autophagic process and have highlighted its broad clinical applications, making autophagy a major target for drug development.
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Affiliation(s)
- Andrea Havasi
- Department of Nephrology, Boston University Medical Center, Boston, MA.
| | - Zheng Dong
- Department of Nephrology, Second Xiangya Hospital of Central South University, Changsha, China; Department of Cellular Biology and Anatomy, Medical College of Georgia and Charlie Norwood VA Medical Center, Augusta, GA
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Abstract
Insulin resistance, type 2 diabetes mellitus and associated hyperinsulinaemia can promote the development of a specific form of cardiomyopathy that is independent of coronary artery disease and hypertension. Termed diabetic cardiomyopathy, this form of cardiomyopathy is a major cause of morbidity and mortality in developed nations, and the prevalence of this condition is rising in parallel with increases in the incidence of obesity and type 2 diabetes mellitus. Of note, female patients seem to be particularly susceptible to the development of this complication of metabolic disease. The diabetic cardiomyopathy observed in insulin- resistant or hyperinsulinaemic states is characterized by impaired myocardial insulin signalling, mitochondrial dysfunction, endoplasmic reticulum stress, impaired calcium homeostasis, abnormal coronary microcirculation, activation of the sympathetic nervous system, activation of the renin-angiotensin-aldosterone system and maladaptive immune responses. These pathophysiological changes result in oxidative stress, fibrosis, hypertrophy, cardiac diastolic dysfunction and eventually systolic heart failure. This Review highlights a surge in diabetic cardiomyopathy research, summarizes current understanding of the molecular mechanisms underpinning this condition and explores potential preventive and therapeutic strategies.
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Affiliation(s)
- Guanghong Jia
- Diabetes and Cardiovascular Center, University of Missouri School of Medicine, D109 Diabetes Center HSC, One Hospital Drive, Columbia, Missouri, 65212, USA
| | - Vincent G DeMarco
- Diabetes and Cardiovascular Center, University of Missouri School of Medicine, D109 Diabetes Center HSC, One Hospital Drive, Columbia, Missouri, 65212, USA
| | - James R Sowers
- Diabetes and Cardiovascular Center, University of Missouri School of Medicine, D109 Diabetes Center HSC, One Hospital Drive, Columbia, Missouri, 65212, USA
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Li J, Chen K, Li S, Feng J, Liu T, Wang F, Zhang R, Xu S, Zhou Y, Zhou S, Xia Y, Lu J, Zhou Y, Guo C. Protective effect of fucoidan from Fucus vesiculosus on liver fibrosis via the TGF-β1/Smad pathway-mediated inhibition of extracellular matrix and autophagy. Drug Des Devel Ther 2016; 10:619-30. [PMID: 26929597 PMCID: PMC4758785 DOI: 10.2147/dddt.s98740] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Liver fibrosis is a dynamic reversible pathological process in the development of chronic liver disease to cirrhosis. However, the current treatments are not administered for a long term due to their various side effects. Autophagy is initiated to decompose damaged or excess organelles, which had been found to alter the progression of liver fibrosis. In this article, we hypothesized that fucoidan from Fucus vesiculosus may attenuate liver fibrosis in mice by inhibition of the extracellular matrix and autophagy in carbon tetrachloride- and bile duct ligation-induced animal models of liver fibrosis. The results were determined using enzyme-linked immunosorbent assay, quantitative real-time polymerase chain reaction, Western blotting, and immunohistochemical staining. Fucoidan from F. vesiculosus could inhibit the activation of hepatic stellate cells and the formation of extracellular matrix and autophagosomes, and its effect may be associated with the downregulation of transforming growth factor beta 1/Smads pathways. Fucoidan, as an autophagy and transforming growth factor beta 1 inhibitor, could be a promising potential therapeutic agent for liver fibrosis.
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Affiliation(s)
- Jingjing Li
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
| | - Kan Chen
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
| | - Sainan Li
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
| | - Jiao Feng
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
| | - Tong Liu
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
| | - Fan Wang
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
| | - Rong Zhang
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
- The First Clinical Medical College of Nanjing Medical University, Nanjing, People’s Republic of China
| | - Shizan Xu
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
- The First Clinical Medical College of Nanjing Medical University, Nanjing, People’s Republic of China
| | - Yuqing Zhou
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
- Department of Gastroenterology, The First Affiliated Hospital of Soochow University, Suzhou, People’s Republic of China
| | - Shunfeng Zhou
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
- Department of Gastroenterology, The First Affiliated Hospital of Soochow University, Suzhou, People’s Republic of China
| | - Yujing Xia
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
| | - Jie Lu
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
| | - Yingqun Zhou
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
| | - Chuanyong Guo
- Department of Gastroenterology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China
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Apoptosis, autophagy and unfolded protein response pathways in Arbovirus replication and pathogenesis. Expert Rev Mol Med 2016; 18:e1. [PMID: 26781343 PMCID: PMC4836210 DOI: 10.1017/erm.2015.19] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Arboviruses are pathogens that widely affect the health of people in different communities around the world. Recently, a few successful approaches toward production of effective vaccines against some of these pathogens have been developed, but treatment and prevention of the resulting diseases remain a major health and research concern. The arbovirus infection and replication processes are complex, and many factors are involved in their regulation. Apoptosis, autophagy and the unfolded protein response (UPR) are three mechanisms that are involved in pathogenesis of many viruses. In this review, we focus on the importance of these pathways in the arbovirus replication and infection processes. We provide a brief introduction on how apoptosis, autophagy and the UPR are initiated and regulated, and then discuss the involvement of these pathways in regulation of arbovirus pathogenesis.
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Chen TK, Choi MJ, Kao WHL, Astor BC, Scialla JJ, Appel LJ, Li L, Lipkowitz MS, Wolf M, Parekh RS, Winkler CA, Estrella MM, Crews DC. Examination of Potential Modifiers of the Association of APOL1 Alleles with CKD Progression. Clin J Am Soc Nephrol 2015; 10:2128-35. [PMID: 26430087 DOI: 10.2215/cjn.05220515] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 08/12/2015] [Indexed: 01/13/2023]
Abstract
BACKGROUND AND OBJECTIVES Common apolipoprotein L1 (APOL1) variants are associated with increased risk of progressive CKD; however, not all individuals with high-risk APOL1 variants experience CKD progression. Identification of factors contributing to heterogeneity has important scientific and clinical implications. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Using multivariable Cox models, we analyzed data from 693 participants in the African American Study of Kidney Disease and Hypertension to identify factors that modify the association between APOL1 genotypes and CKD progression (doubling of serum creatinine or incident ESRD). RESULTS Participant mean age was 54 years old, median GFR was 49 ml/min per 1.73 m(2), and 23% had the APOL1 high-risk genotype (two copies of the high-risk allele). Over a mean follow-up of 7.8 years, 288 (42%) participants experienced CKD progression. As previously reported, the high-risk genotype was associated with higher risk of CKD progression compared with the low-risk genotype (hazard ratio [HR], 1.88; 95% confidence interval [95% CI], 1.46 to 2.41). Although we found some suggestion that obesity (HR, 1.48; 95% CI, 1.05 to 2.08 and HR, 2.44; 95% CI, 1.66 to 3.57 for body mass index ≥ 30 versus <30 kg/m(2); P interaction =0.04) and increased urinary excretion of urea nitrogen (HR, 1.43; 95% CI, 0.98 to 2.09 versus HR, 2.33; 95% CI, 1.65 to 3.30 for urine urea nitrogen ≥ 8 versus <8 g/d; P interaction =0.04) were associated with lower APOL1-associated risk for CKD progression, these findings were not robust in sensitivity analyses with alternative cut points. No other sociodemographic (e.g., education and income), clinical (e.g., systolic BP and smoking), or laboratory (e.g., net endogenous acid production, urinary sodium and potassium excretions, 25-hydroxy vitamin D, intact parathyroid hormone, or fibroblast growth factor 23) variables modified the association between APOL1 and CKD progression (P interaction >0.05 for each). CONCLUSIONS Sociodemographic factors and common risk factors for CKD progression do not seem to alter APOL1-related CKD progression. Additional investigation is needed to identify nontraditional factors that may affect the association between APOL1 and progressive CKD.
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Affiliation(s)
- Teresa K Chen
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material.
| | - Michael J Choi
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - W H Linda Kao
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Brad C Astor
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Julia J Scialla
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Lawrence J Appel
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Liang Li
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Michael S Lipkowitz
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Myles Wolf
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Rulan S Parekh
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Cheryl A Winkler
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Michelle M Estrella
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
| | - Deidra C Crews
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
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Xu Z, Yang L, Xu S, Zhang Z, Cao Y. The receptor proteins: pivotal roles in selective autophagy. Acta Biochim Biophys Sin (Shanghai) 2015; 47:571-80. [PMID: 26112016 DOI: 10.1093/abbs/gmv055] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 03/30/2015] [Indexed: 02/05/2023] Open
Abstract
Autophagy is a highly regulated and multistep biological process whereby cells under metabolic, proteotoxic, or other stresses remove dysfunctional organelles and/or misfolded/polyubiquitinated proteins by shuttling them via specialized structures called autophagosomes to the lysosome for degradation. Although autophagy is generally considered to be a non-selective process, accumulating evidence suggests that it can also selectively degrade specific target cargoes. These selective targets include proteins, mitochondria, and even invading bacteria. The discovery and characterization of autophagic adapters, such as p62/Sequestosome 1 (SQSTM1) and Neighbor of BRCA1 gene 1 (NBR1), have provided mechanistic insights into selective autophagy. These receptors are all able to act as cargo receptors for the degradation of ubiquitinated substrates. This review mainly summarizes the most up-to-date findings regarding the key receptor proteins that play important roles in regulating selective autophagy.
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Affiliation(s)
- Zhijie Xu
- Cancer Research Institute, Central South University, Changsha 410078, China Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Changsha 410078, China Key Laboratory of Carcinogenesis, Ministry of Health, Changsha 410078, China
| | - Lifang Yang
- Cancer Research Institute, Central South University, Changsha 410078, China Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Changsha 410078, China Key Laboratory of Carcinogenesis, Ministry of Health, Changsha 410078, China
| | - San Xu
- Cancer Research Institute, Central South University, Changsha 410078, China Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Changsha 410078, China Key Laboratory of Carcinogenesis, Ministry of Health, Changsha 410078, China
| | - Zhibao Zhang
- Cancer Research Institute, Central South University, Changsha 410078, China Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Changsha 410078, China Key Laboratory of Carcinogenesis, Ministry of Health, Changsha 410078, China
| | - Ya Cao
- Cancer Research Institute, Central South University, Changsha 410078, China Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Changsha 410078, China Key Laboratory of Carcinogenesis, Ministry of Health, Changsha 410078, China
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Tian PG, Jiang ZX, Li JH, Zhou Z, Zhang QH. Spliced XBP1 promotes macrophage survival and autophagy by interacting with Beclin-1. Biochem Biophys Res Commun 2015; 463:518-23. [PMID: 26026678 DOI: 10.1016/j.bbrc.2015.05.061] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 05/15/2015] [Indexed: 11/17/2022]
Abstract
Macrophage autophagy plays an important role in the development of atherosclerosis, but the precise mechanism mediating this process is unclear. The potential role of the X-box binding protein 1 (XBP1), a crucial transduction factor that is involved in endoplasmic reticulum stress and the unfolded protein response, in bone marrow-derived macrophage autophagy is unknown. This study mainly explores the roles of XBP1 mRNA splicing in bone marrow-derived macrophage autophagy. The present study shows that the transient overexpression of spliced XBP1 via adenovirus-mediated gene transfer induces autophagy and promotes proliferation in bone marrow-derived macrophages via the down-regulation of Beclin-1, but that the sustained overexpression of spliced XBP1 leads to apoptosis. When XBP1 is down-regulated in bone marrow-derived macrophages using siRNA, rapamycin-induced autophagosome formation is ablated. Furthermore, we have detected the overexpression of XBP1 in areas of atherosclerotic plaques in the arteries of ApoE-/- mice. These results demonstrate that XBP1 mRNA splicing plays an important role in maintaining the function of bone marrow-derived macrophages and provide new insight into the study and treatment of atherosclerosis.
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Affiliation(s)
- Ping-Ge Tian
- Southern Medical University, Guangzhou, Guangdong 510515, China
| | - Zhi-Xin Jiang
- Centre Laboratory, The 305th Hospital of the People's Liberation Army, Beijing 100017, China
| | - Jian-Hua Li
- Department of Geriatric Cardiology, Chinese PLA General Hosptial, Beijing 100853, China
| | - Zhe Zhou
- Laboratory of Biotechnology, Beijing Institute of Radiation Medicine, Beijing 100850, China.
| | - Qing-Hua Zhang
- Department of Cardiology, The 305th Hospital of the People's Liberation Army, Beijing 100017, China.
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Guo SX, Jin YY, Fang Q, You CG, Wang XG, Hu XL, Han CM. Beneficial effects of hydrogen-rich saline on early burn-wound progression in rats. PLoS One 2015; 10:e0124897. [PMID: 25874619 PMCID: PMC4395383 DOI: 10.1371/journal.pone.0124897] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Accepted: 03/06/2015] [Indexed: 12/19/2022] Open
Abstract
Introduction Deep burn wounds undergo a dynamic process known as wound progression that results in a deepening and extension of the initial burn area. The zone of stasis is more likely to develop more severe during wound progression in the presence of hypoperfusion. Hydrogen has been reported to alleviate injury triggered by ischaemia/reperfusion and burns in various organs by selectively quenching oxygen free radicals. The aim of this study was to investigate the possible protective effects of hydrogen against early burn-wound progression. Methods Deep-burn models were established through contact with a boiled, rectangular, brass comb for 20 s. Fifty-six Sprague-Dawley rats were randomly divided into sham, burn plus saline, and burn plus hydrogen-rich saline (HS) groups with sacrifice and analysis at various time windows (6 h, 24 h, 48 h) post burn. Indexes of oxidative stress, apoptosis and autophagy were measured in each group. The zone of stasis was evaluated using immunofluorescence staining, ELISA, and Western blot to explore the underlying effects and mechanisms post burn. Results The burn-induced increase in malondialdehyde was markedly reduced with HS, while the activities of endogenous antioxidant enzymes were significantly increased. Moreover, HS treatment attenuated increases in apoptosis and autophagy postburn in wounds, according to the TUNEL staining results and the expression analysis of Bax, Bcl-2, caspase-3, Beclin-1 and Atg-5 proteins. Additionally, HS lowered the level of myeloperoxidase and expression of TNF-α, IL-1β, and IL-6 in the zone of stasis while augmenting IL-10. The elevated levels of Akt phosphorylation and NF-κB p65 expression post burn were also downregulated by HS management. Conclusion Hydrogen can attenuate early wound progression following deep burn injury. The beneficial effect of hydrogen was mediated by attenuating oxidative stress, which inhibited apoptosis and inflammation, and the Akt/NF-κB signalling pathway may be involved in regulating the release of inflammatory cytokines.
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Affiliation(s)
- Song Xue Guo
- Department of Burns, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yun Yun Jin
- Department of Burns, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Quan Fang
- Department of Plastic Surgery, Binjiang Branch, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Chuan Gang You
- Department of Burns, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Xin Gang Wang
- Department of Burns, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Xin Lei Hu
- Department of Orthopaedics, Binjiang Branch, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Chun-Mao Han
- Department of Burns, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
- * E-mail:
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Ren J, Zhang Y. Emerging potential of therapeutic targeting of autophagy and protein quality control in the management of cardiometabolic diseases. Biochim Biophys Acta Mol Basis Dis 2015; 1852:185-7. [DOI: 10.1016/j.bbadis.2014.11.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Jia G, Aroor AR, Martinez-Lemus LA, Sowers JR. Mitochondrial functional impairment in response to environmental toxins in the cardiorenal metabolic syndrome. Arch Toxicol 2015; 89:147-53. [PMID: 25559775 DOI: 10.1007/s00204-014-1431-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 12/04/2014] [Indexed: 12/19/2022]
Abstract
Environmental toxins can promote cardiovascular, metabolic, and renal abnormalities, which characterize the cardiorenal metabolic syndrome (CRS). Heavy metals, such as mercury and arsenic, represent two of the most toxic pollutants. Exposure to these toxins is increasing due to increased industrialization throughout much of the world. Studies conducted to understand the impact of environmental toxins have shown a major impact on mitochondrial structure and function. The maladaptive stress products caused by these toxins, including aggregated proteins, damaged organelles, and intracellular pathogens, can be removed through autophagy, which is also known as mitophagy in mitochondria. Although the underlying mechanisms involved in the regulation of mitophagy in response to pollution are not well understood, accumulating evidence supports a role for maladaptive mitochondrial responses to environmental pollution in the pathogenesis of the CRS. In this review, we discuss the ongoing research, which explores the mechanisms by which these toxins promote abnormalities in mitophagy and associated mitochondrial dysfunction and the CRS.
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Affiliation(s)
- Guanghong Jia
- Division of Endocrinology, Diabetes, and Metabolism, Diabetes Cardiovascular Center, University of Missouri School of Medicine, Columbia, MO, USA
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Zhang L, Cheng X, Gao Y, Zheng J, Xu Q, Sun Y, Guan H, Yu H, Sun Z. Apigenin induces autophagic cell death in human papillary thyroid carcinoma BCPAP cells. Food Funct 2015; 6:3464-72. [DOI: 10.1039/c5fo00671f] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Apigenin-induced autophagic cell death in human papillary thyroid carcinoma BCPAP cells is associated with ROS generation, DNA damage and cell cycle arrest.
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Affiliation(s)
- Li Zhang
- Key Laboratory of Nuclear Medicine
- Ministry of Health
- Jiangsu Key Laboratory of Molecular Nuclear Medicine
- Jiangsu Institute of Nuclear Medicine
- Wuxi
| | - Xian Cheng
- Key Laboratory of Nuclear Medicine
- Ministry of Health
- Jiangsu Key Laboratory of Molecular Nuclear Medicine
- Jiangsu Institute of Nuclear Medicine
- Wuxi
| | - Yanyan Gao
- Key Laboratory of Nuclear Medicine
- Ministry of Health
- Jiangsu Key Laboratory of Molecular Nuclear Medicine
- Jiangsu Institute of Nuclear Medicine
- Wuxi
| | - Jie Zheng
- School of Food Science and Technology
- Jiangnan University
- Wuxi
- China
| | - Qiang Xu
- State Key Laboratory of Pharmaceutical Biotechnology
- School of Life Sciences
- Nanjing University
- Nanjing
- China
| | - Yang Sun
- State Key Laboratory of Pharmaceutical Biotechnology
- School of Life Sciences
- Nanjing University
- Nanjing
- China
| | - Haixia Guan
- Department of Endocrinology & Metabolism and Institute of Endocrinology
- the First Hospital of China Medical University
- Shenyang
- China
| | - Huixin Yu
- Key Laboratory of Nuclear Medicine
- Ministry of Health
- Jiangsu Key Laboratory of Molecular Nuclear Medicine
- Jiangsu Institute of Nuclear Medicine
- Wuxi
| | - Zhen Sun
- School of Food Science and Technology
- Jiangnan University
- Wuxi
- China
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Targeting autophagy in skin diseases. J Mol Med (Berl) 2014; 93:31-8. [PMID: 25404245 DOI: 10.1007/s00109-014-1225-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 11/02/2014] [Accepted: 11/05/2014] [Indexed: 12/19/2022]
Abstract
Autophagy is a major intracellular degradative process by which cytoplasmic materials are sequestered in double-membraned vesicles and degraded upon fusion with lysosomes. Under normal circumstances, basal autophagy is necessary to maintain cellular homeostasis by scavenging dysfunctional or damaged organelles or proteins. In addition to its vital homeostatic role, this degradation pathway has been implicated in many different cellular processes such as cell apoptosis, inflammation, pathogen clearance, and antigen presentation and thereby has been linked to a variety of human disorders, including metabolic conditions, neurodegenerative diseases, cancers, and infectious diseases. The skin, the largest organ of the body, serves as the first line of defense against many different environmental insults; however, only a few studies have examined the effect of autophagy on the pathogenesis of skin diseases. This review provides an overview of the mechanisms of autophagy and highlights recent findings relevant to the role of autophagy in skin diseases and strategies for therapeutic modulation.
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