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Wang L, Yan F, Shi Y, Su X, Zhang Y. PSAT1 promotes autophagy to resist insufficient autophagy caused by cigarette smoke extract in human airway epithelial cells. Toxicol In Vitro 2024; 94:105711. [PMID: 37832835 DOI: 10.1016/j.tiv.2023.105711] [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: 04/12/2023] [Revised: 06/25/2023] [Accepted: 10/10/2023] [Indexed: 10/15/2023]
Abstract
The inhaling of cigarette smoke (CS) causes damage to airway epithelial cells, which is related to chronic obstructive pulmonary disease (COPD). It has been established that CS induces autophagy, but it is still unclear whether excessive or insufficient autophagy results in cell death. This study discovered that CS significantly elevates PSAT1 expression in bronchial epithelial cells. Further studies using autophagy inhibitor, RNA interference, RT-qPCR, western blot, and CCK-8 assay in 16-HBE cells have confirmed that autophagy is temporarily initiated by cigarette smoke extract (CSE), but insufficient autophagy leads to cell death. PSAT1 induced by CSE promotes autophagy and resists insufficient autophagy caused by CSE through Akt/mTOR pathway in human bronchial epithelial cells, playing a protective role.
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Affiliation(s)
- Lixing Wang
- Clinical Center for Molecular Diagnosis and Therapy, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, Fujian, China
| | - Furong Yan
- Clinical Center for Molecular Diagnosis and Therapy, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, Fujian, China
| | - Yongbin Shi
- Clinical Center for Molecular Diagnosis and Therapy, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, Fujian, China
| | - Xiaoshan Su
- Department of Pulmonary and Critical Care Medicine, The Second Affiliated Hospital of Fujian Medical University, Respirology Medicine Centre of Fujian Province, Quanzhou, Fujian, China
| | - Yaping Zhang
- Clinical Center for Molecular Diagnosis and Therapy, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, Fujian, China.
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2
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Wang Q, Su W, Liu J, Zhao D. Advances in the investigation of the role of autophagy in the etiology of chronic obstructive pulmonary disease: A review. Medicine (Baltimore) 2023; 102:e36390. [PMID: 38013266 PMCID: PMC10681501 DOI: 10.1097/md.0000000000036390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 11/09/2023] [Indexed: 11/29/2023] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a common chronic respiratory illness. It arises from emphysema and chronic bronchitis and is characterized by progressive and irreversible airflow limitation and chronic inflammation of the lungs, which eventually progresses to pulmonary hypertension, chronic pulmonary heart disease and respiratory failure. Autophagy is a highly conserved cellular homeostasis maintenance mechanism that involves the transport of damaged organelles and proteins to lysosomes for destruction. Dysregulation of autophagy is one of the pathogenic mechanisms of many diseases and is strongly associated with the development of COPD, although the precise mechanisms are unknown. In this paper, we focus on macroautophagy, a type of autophagy that has been thoroughly studied, and describe the characteristics, processes, regulatory pathways, and functions of autophagy, and discuss its relationship with COPD from the perspectives of inflammation, emphysema, mucus hypersecretion, cilia structure and function, airway remodeling, vascular remodeling, and bacterial infections, with a view to searching for the therapeutic targets of COPD from the perspective of autophagy, which is hoped to be helpful for the clinical treatment.
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Affiliation(s)
- Qianxinhong Wang
- College of Traditional Chinese Medicine, Changchun University of Chinese Medicine, Changchun, China
| | - Wenlong Su
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Junnan Liu
- The Third Clinical Hospital of Changchun University of Traditional Chinese Medicine, Changchun, China
| | - Dongkai Zhao
- The Third Clinical Hospital of Changchun University of Traditional Chinese Medicine, Changchun, China
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3
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Albano GD, Montalbano AM, Gagliardo R, Profita M. Autophagy/Mitophagy in Airway Diseases: Impact of Oxidative Stress on Epithelial Cells. Biomolecules 2023; 13:1217. [PMID: 37627282 PMCID: PMC10452925 DOI: 10.3390/biom13081217] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 08/27/2023] Open
Abstract
Autophagy is the key process by which the cell degrades parts of itself within the lysosomes. It maintains cell survival and homeostasis by removing molecules (particularly proteins), subcellular organelles, damaged cytoplasmic macromolecules, and by recycling the degradation products. The selective removal or degradation of mitochondria is a particular type of autophagy called mitophagy. Various forms of cellular stress (oxidative stress (OS), hypoxia, pathogen infections) affect autophagy by inducing free radicals and reactive oxygen species (ROS) formation to promote the antioxidant response. Dysfunctional mechanisms of autophagy have been found in different respiratory diseases such as chronic obstructive lung disease (COPD) and asthma, involving epithelial cells. Several existing clinically approved drugs may modulate autophagy to varying extents. However, these drugs are nonspecific and not currently utilized to manipulate autophagy in airway diseases. In this review, we provide an overview of different autophagic pathways with particular attention on the dysfunctional mechanisms of autophagy in the epithelial cells during asthma and COPD. Our aim is to further deepen and disclose the research in this direction to stimulate the develop of new and selective drugs to regulate autophagy for asthma and COPD treatment.
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Affiliation(s)
- Giusy Daniela Albano
- Institute of Translational Pharmacology (IFT), National Research Council of Italy (CNR), Section of Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy; (A.M.M.); (R.G.); (M.P.)
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Liu P, Zhang M, Gao H, Han S, Liu J, Sun X, Zhao L. Regulation of whole-transcriptome sequencing expression in COPD after personalized precise exercise training: a pilot study. Respir Res 2023; 24:156. [PMID: 37312153 DOI: 10.1186/s12931-023-02461-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 05/23/2023] [Indexed: 06/15/2023] Open
Abstract
BACKGROUND Chronic obstructive pulmonary disease (COPD) is one of the world's leading causes of death and a major chronic respiratory disease. Aerobic exercise, the cornerstone of pulmonary rehabilitation, improves prognosis of COPD patients; however, few studies have comprehensively examined the changes in RNA transcript levels and the crosstalk between various transcripts in this context. This study identified the expression of RNA transcripts in COPD patients who engaged in aerobic exercise training for 12 weeks, and further constructions of the possible RNAs networks were made. METHODS Peripheral blood samples for all four COPD patients who benefited from 12 weeks of PR were collected pre- and post-aerobic exercises and evaluated for the expression of mRNA, miRNA, lncRNA, and circRNA with high-throughput RNA sequencing followed by GEO date validation. In addition, enrichment analyses were conducted on different expressed mRNAs. LncRNA-mRNA and circRNA-mRNA coexpression networks, as well as lncRNA-miRNA-mRNA and circRNA-miRNA-mRNA competing expression networks (ceRNAs) in COPD were constructed. RESULTS We identified and analyzed the differentially expressed mRNAs and noncoding RNAs in the peripheral blood of COPD patients' post-exercise. Eighty-six mRNAs, 570 lncRNAs, 8 miRNAs, and 2087 circRNAs were differentially expressed. Direct function enrichment analysis and Gene Set Variation Analysis showed that differentially expressed RNAs(DE-RNAs) correlated with several critical biological processes such as chemotaxis, DNA replication, anti-infection humoral response, oxidative phosphorylation, and immunometabolism, which might affect the progression of COPD. Some DE-RNAs were validated by Geo databases and RT-PCR, and the results were highly correlated with RNA sequencing. We constructed ceRNA networks of DE-RNAs in COPD. CONCLUSIONS The systematic understanding of the impact of aerobic exercise on COPD was achieved using transcriptomic profiling. This research offers a number of potential candidates for clarifying the regulatory mechanisms that exercise has on COPD, which could ultimately help in understanding the pathophysiology of COPD.
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Affiliation(s)
- Panpan Liu
- Department of Pulmonary and Critical Care Medicine, Shanghai Pudong New Area Gongli Hospital, 219 MiaoPu Road, Shanghai, 200315, People's Republic of China
| | - Meilan Zhang
- Department of Pulmonary and Critical Care Medicine, Shanghai Pudong New Area Gongli Hospital, 219 MiaoPu Road, Shanghai, 200315, People's Republic of China
| | - Hongchang Gao
- Department of Pulmonary and Critical Care Medicine, Shanghai Pudong New Area Gongli Hospital, 219 MiaoPu Road, Shanghai, 200315, People's Republic of China
| | - Shaojun Han
- Department of Pulmonary and Critical Care Medicine, Shanghai Pudong New Area Gongli Hospital, 219 MiaoPu Road, Shanghai, 200315, People's Republic of China
| | - Jinming Liu
- Department of Pulmonary and Critical Care Medicine, Shanghai Pulmonary Hospital Affiliated to TongJi University, Shanghai, China
| | - Xingguo Sun
- Department of Physiology and Medicine, Fuwai Hospital, Chinese Academy of Medical Sciences National Center of Cardiovascular Diseases, Beijing, People's Republic of China.
| | - Lei Zhao
- Department of Pulmonary and Critical Care Medicine, Shanghai Pudong New Area Gongli Hospital, 219 MiaoPu Road, Shanghai, 200315, People's Republic of China.
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Jiang Y, Yin X, Xu Q, Tang X, Zhang H, Cao X, Lin J, Wang Y, Yang F, Khan NU, Shen L, Zhao D. SWATH proteomics analysis of placental tissue with intrahepatic cholestasis of pregnancy. Placenta 2023; 137:1-13. [PMID: 37054625 DOI: 10.1016/j.placenta.2023.04.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 02/26/2023] [Accepted: 04/07/2023] [Indexed: 04/15/2023]
Abstract
INTRODUCTION Intrahepatic cholestasis of pregnancy (ICP) usually occurs in the second and third trimesters. The disease's etiology and diagnostic criteria are currently unknown. Based on a sequence window to obtain all theoretical fragment ions (SWATH) proteomic approach, this study sought to identify potential proteins in placental tissue that may be involved in the pathogenesis of ICP and adverse fetal pregnancy outcomes. METHODS The postpartum placental tissue of pregnant women with ICP were chosen as the case group (ICP group) (subdivided into mild ICP group (MICP group) and severe ICP group (SICP group)), and healthy pregnant women were chosen as the control group (CTR). The hematoxylin-eosin (HE) staining was used to observe the histologic changes of placenta. The SWATH analysis combined with liquid chromatography-tandem mass spectrometry (LC-MS) was used to screen the differentially expressed proteins (DEPs) in ICP and CTR groups, and bioinformatics analysis was used to find out the biological process of these differential proteins. RESULTS Proteomic studies showed there were 126 DEPs from pregnant women with ICP and healthy pregnant women. Most of the identified proteins were functionally related to humoral immune response, cell response to lipopolysaccharide, antioxidant activity and heme metabolism. A subsequent examination of placentas from patients with mild and severe ICP revealed 48 proteins that were differentially expressed. Through death domain receptors and fibrinogen complexes, these DEPs primarily regulate extrinsic apoptotic signaling pathways, blood coagulation, and fibrin clot formation. The differential expressions of HBD, HPX, PDE3A, and PRG4 were down-regulated by Western blot analysis, which was consistent with proteomics. DISCUSSION This preliminary study helps us to understand the changes in the placental proteome of ICP patients, and provides new insights into the pathophysiology of ICP.
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Affiliation(s)
- Yuxuan Jiang
- Department of Obstetrics and Gynecology Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Xiaoping Yin
- Department of Obstetrics and Gynecology Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Qian Xu
- Department of Obstetrics and Gynecology Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Xiaoxiao Tang
- College of Life Science and Oceanography, Shenzhen University, Shenzhen, China
| | - Huajie Zhang
- College of Life Science and Oceanography, Shenzhen University, Shenzhen, China
| | - Xueshan Cao
- College of Life Science and Oceanography, Shenzhen University, Shenzhen, China
| | - Jing Lin
- College of Life Science and Oceanography, Shenzhen University, Shenzhen, China
| | - Yi Wang
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, China
| | - Fei Yang
- Department of Obstetrics and Gynecology Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Naseer Ullah Khan
- College of Life Science and Oceanography, Shenzhen University, Shenzhen, China
| | - Liming Shen
- College of Life Science and Oceanography, Shenzhen University, Shenzhen, China.
| | - Danqing Zhao
- Department of Obstetrics and Gynecology Affiliated Hospital of Guizhou Medical University, Guiyang, China.
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Jiang J, Xu S, Chen Z, Liu W, Zhang L, Li J, Zhu Z, Zhou L. Animal models: An essential tool to dissect the heterogeneity of chronic obstructive pulmonary disease. J Transl Int Med 2023; 11:4-10. [PMID: 37533843 PMCID: PMC10393054 DOI: 10.2478/jtim-2023-0007] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023] Open
Affiliation(s)
- Jingxian Jiang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital, Nanjing Medical University, Nanjing210029, Jiangsu Province, China
| | - Shuanglan Xu
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital, Nanjing Medical University, Nanjing210029, Jiangsu Province, China
| | - Zi Chen
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital, Nanjing Medical University, Nanjing210029, Jiangsu Province, China
| | - Weihua Liu
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital, Nanjing Medical University, Nanjing210029, Jiangsu Province, China
| | - Liuchao Zhang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital, Nanjing Medical University, Nanjing210029, Jiangsu Province, China
| | - Jianmin Li
- Animal Core Facility, Key Laboratory of Model Animal, Nanjing Medical University, Nanjing211166, Jiangsu Province, China
| | - Zhou Zhu
- Department of Pediatrics and Department of Molecular Microbiology and Immunology, Brown University Warren Alpert Medical School, Providence, RI02912, USA
| | - Linfu Zhou
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital, Nanjing Medical University, Nanjing210029, Jiangsu Province, China
- Animal Core Facility, Key Laboratory of Model Animal, Nanjing Medical University, Nanjing211166, Jiangsu Province, China
- Institute of Integrative Medicine, Nanjing Medical University, Nanjing210029, Jiangsu Province, China
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7
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Zhang Y, Zhang J, Fu Z. Role of autophagy in lung diseases and ageing. Eur Respir Rev 2022; 31:31/166/220134. [PMID: 36543345 PMCID: PMC9879344 DOI: 10.1183/16000617.0134-2022] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 11/08/2022] [Indexed: 12/24/2022] Open
Abstract
The lungs face ongoing chemical, mechanical, biological, immunological and xenobiotic stresses over a lifetime. Advancing age progressively impairs lung function. Autophagy is a "housekeeping" survival strategy involved in numerous physiological and pathological processes in all eukaryotic cells. Autophagic activity decreases with age in several species, whereas its basic activity extends throughout the lifespan of most animals. Dysregulation of autophagy has been proven to be closely related to the pathogenesis of several ageing-related pulmonary diseases. This review summarises the role of autophagy in the pathogenesis of pulmonary diseases associated with or occurring in the context of ageing, including acute lung injury, chronic obstructive pulmonary disease, asthma and pulmonary fibrosis, and describes its potential as a therapeutic target.
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Affiliation(s)
- Yan Zhang
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Jin Zhang
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Zhiling Fu
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, China,Corresponding author: Zhiling Fu ()
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Proteomics profile of mesenchymal stromal cells and extracellular vesicles in normoxic and hypoxic conditions. Cytotherapy 2022; 24:1211-1224. [PMID: 36192337 DOI: 10.1016/j.jcyt.2022.08.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 08/11/2022] [Accepted: 08/27/2022] [Indexed: 01/31/2023]
Abstract
BACKGROUND AIMS Although bone marrow-derived mesenchymal stromal cells (MSCs) have demonstrated success in pre-clinical studies, they have shown only mild therapeutic effects in clinical trials. Hypoxia pre-conditioning may optimize the performance of bone marrow-derived MSCs because it better reflects the physiological conditions of their origin. It is not known whether changes in the protein profile caused by hypoxia in MSCs can be extended to the extracellular vesicles (EVs) released from them. The aim of this study was to evaluate the proteomics profile of MSCs and their EVs under normoxic and hypoxic conditions. METHODS Bone marrow-derived MSCs were isolated from six healthy male Wistar rats. After achieving 80% confluence, MSCs were subjected to normoxia (MSC-Norm) (21% oxygen, 5% carbon dioxide, 74% nitrogen) or hypoxia (MSC-Hyp) (1% oxygen, 5% carbon dioxide, 94% nitrogen) for 48 h. Cell viability and oxygen consumption rate were assessed. EVs were extracted from MSCs for each condition (EV-Norm and EV-Hyp) by ultracentrifugation. Total proteins were isolated from MSCs and EVs and prepared for mass spectrometry. EVs were characterized by nanoparticle tracking analysis. Proteomics data were analyzed by PatternLab 4.0, Search Tool for the Retrieval of Interacting Genes/Proteins, Gene Ontology, MetaboAnalyst and Reactome software. RESULTS Cell viability was higher in MSC-Hyp than MSC-Norm (P = 0.007). Basal respiration (P = 0.001), proton leak (P = 0.004) and maximal respiration (P = 0.014) were lower in MSC-Hyp than MSC-Norm, and no changes in adenosine triphosphate-linked and residual respiration were observed. The authors detected 2177 proteins in MSC-Hyp and MSC-Norm, of which 147 were identified in only MSC-Hyp and 512 were identified in only MSC-Norm. Furthermore, 718 proteins were identified in EV-Hyp and EV-Norm, of which 293 were detected in only EV-Hyp and 30 were detected in only EV-Norm. Both MSC-Hyp and EV-Hyp showed enrichment of pathways and biological processes related to glycolysis, the immune system and extracellular matrix organization. CONCLUSIONS MSCs subjected to hypoxia showed changes in their survival and metabolic activity. In addition, MSCs under hypoxia released more EVs, and their content was related to expression of regulatory proteins of the immune system and extracellular matrix organization. Because of the upregulation of proteins involved in glycolysis, gluconeogenesis and glucose uptake during hypoxia, production of reactive oxygen species and expression of immunosuppressive properties may be affected.
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Erxian decoction inhibits apoptosis by activating Akt1 and repairs spinal cord injury in rats. Heliyon 2022; 8:e11279. [DOI: 10.1016/j.heliyon.2022.e11279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/26/2022] [Accepted: 10/20/2022] [Indexed: 11/06/2022] Open
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10
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Zhao X, Zhang Q, Zheng R. The interplay between oxidative stress and autophagy in chronic obstructive pulmonary disease. Front Physiol 2022; 13:1004275. [PMID: 36225291 PMCID: PMC9548529 DOI: 10.3389/fphys.2022.1004275] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 09/07/2022] [Indexed: 11/13/2022] Open
Abstract
Autophagy is a highly conserved process that is indispensable for cell survival, embryonic development, and tissue homeostasis. Activation of autophagy protects cells against oxidative stress and is a major adaptive response to injury. When autophagy is dysregulated by factors such as smoking, environmental insults and aging, it can lead to enhanced formation of aggressors and production of reactive oxygen species (ROS), resulting in oxidative stress and oxidative damage to cells. ROS activates autophagy, which in turn promotes cell adaptation and reduces oxidative damage by degrading and circulating damaged macromolecules and dysfunctional cell organelles. The cellular response triggered by oxidative stress includes changes in signaling pathways that ultimately regulate autophagy. Chronic obstructive pulmonary disease (COPD) is the most common lung disease among the elderly worldwide, with a high mortality rate. As an induced response to oxidative stress, autophagy plays an important role in the pathogenesis of COPD. This review discusses the regulation of oxidative stress and autophagy in COPD, and aims to provide new avenues for future research on target-specific treatments for COPD.
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Affiliation(s)
| | | | - Rui Zheng
- *Correspondence: Qiang Zhang, ; Rui Zheng,
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11
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Lin C, Ma M, Zhang Y, Li L, Long F, Xie C, Xiao H, Liu T, Tian B, Yang K, Guo Y, Chen M, Chou J, Gong N, Li X, Hu G. The N 6-methyladenosine modification of circALG1 promotes the metastasis of colorectal cancer mediated by the miR-342-5p/PGF signalling pathway. Mol Cancer 2022; 21:80. [PMID: 35305647 PMCID: PMC8933979 DOI: 10.1186/s12943-022-01560-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 03/06/2022] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Previous studies have shown that the N6-methyladenosine (m6A) modification enhances the binding ability of mRNAs/long noncoding RNAs (lncRNAs) to microRNAs (miRNAs), but the impact of this modification on the competitive endogenous RNA (ceRNA) function of circular RNAs (circRNAs) is unclear. METHODS We used a human circRNA microarray to detect the expression profiles of circRNAs in 3 pairs of cancer and paracancerous tissues from patients with colorectal cancer (CRC) and 3 pairs of peripheral blood specimens from patients with CRC and healthy individuals. The circRNAs highly expressed in both peripheral blood and tumour tissues of patients with CRC, including circALG1, were screened. A quantitative reverse-transcription polymerase chain reaction (qRT-PCR) analysis of an expanded sample size was performed to detect the expression level of circALG1 in peripheral blood and tumour tissues of patients with CRC and determine its correlation with clinicopathological features, and circRNA loop-forming validation and stability assays were then conducted. Transwell assays and a nude mouse cancer metastasis model were used to study the function of circALG1 in CRC and the role of altered m6A modification levels on the regulation of circALG1 function. qRT-PCR, western blot (WB), Transwell, RNA-binding protein immunoprecipitation (RIP), RNA antisense purification (RAP), and dual-luciferase reporter gene assays were performed to analyse the ceRNA mechanism of circALG1 and the effect of the m6A modification of circALG1 on the ceRNA function of this circRNA. RESULTS CircALG1 was highly expressed in both the peripheral blood and tumour tissues of patients with CRC and was closely associated with CRC metastasis. CircALG1 overexpression promoted the migration and invasion of CRC cells, and circALG1 silencing and reduction of the circALG1 m6A modification level inhibited CRC cell migration and invasion. In vivo experiments further confirmed the prometastatic role of circALG1 in CRC. Further mechanistic studies showed that circALG1 upregulated the expression of placental growth factor (PGF) by binding to miR-342-5p and that m6A modification enhanced the binding of circALG1 to miR-342-5p and promoted its ceRNA function. CONCLUSION M6A modification enhances the binding ability of circALG1 to miR-342-5p to promote the ceRNA function of circALG1, and circALG1 could be a potential therapeutic target in and a prognostic marker for CRC.
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Affiliation(s)
- Changwei Lin
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Min Ma
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Yi Zhang
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Liang Li
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Fei Long
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Canbin Xie
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Hua Xiao
- grid.216417.70000 0001 0379 7164Department of Hepatobiliary and Intestinal Surgery, Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, 410013 China
| | - Teng Liu
- Hunan Chest Hospital, Changsha, 410013 China
| | - Buning Tian
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Kaiyan Yang
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Yihang Guo
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Miao Chen
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Jin Chou
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Ni Gong
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Xiaorong Li
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
| | - Gui Hu
- grid.431010.7Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, 410013 China
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Readler JM, Burke MR, Sharma P, Excoffon KJDA, Kolawole AO. Adenovirus Co-Opts Neutrophilic Inflammation to Enhance Transduction of Epithelial Cells. Viruses 2021; 14:13. [PMID: 35062217 PMCID: PMC8781108 DOI: 10.3390/v14010013] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 12/15/2021] [Accepted: 12/20/2021] [Indexed: 12/28/2022] Open
Abstract
Human adenoviruses (HAdV) cause a variety of infections in human hosts, from self-limited upper respiratory tract infections in otherwise healthy people to fulminant pneumonia and death in immunocompromised patients. Many HAdV enter polarized epithelial cells by using the primary receptor, the Coxsackievirus and adenovirus receptor (CAR). Recently published data demonstrate that a potent neutrophil (PMN) chemoattractant, interleukin-8 (IL-8), stimulates airway epithelial cells to increase expression of the apical isoform of CAR (CAREx8), which results in increased epithelial HAdV type 5 (HAdV5) infection. However, the mechanism for PMN-enhanced epithelial HAdV5 transduction remains unclear. In this manuscript, the molecular mechanisms behind PMN mediated enhancement of epithelial HAdV5 transduction are characterized using an MDCK cell line that stably expresses human CAREx8 under a doxycycline inducible promoter (MDCK-CAREx8 cells). Contrary to our hypothesis, PMN exposure does not enhance HAdV5 entry by increasing CAREx8 expression nor through activation of non-specific epithelial endocytic pathways. Instead, PMN serine proteases are responsible for PMN-mediated enhancement of HAdV5 transduction in MDCK-CAREx8 cells. This is evidenced by reduced transduction upon inhibition of PMN serine proteases and increased transduction upon exposure to exogenous human neutrophil elastase (HNE). Furthermore, HNE exposure activates epithelial autophagic flux, which, even when triggered through other mechanisms, results in a similar enhancement of epithelial HAdV5 transduction. Inhibition of F-actin with cytochalasin D partially attenuates PMN mediated enhancement of HAdV transduction. Taken together, these findings suggest that HAdV5 can leverage innate immune responses to establish infections.
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Affiliation(s)
| | | | | | | | - Abimbola O. Kolawole
- Department of Biological Sciences, Wright State University, Dayton, OH 45435, USA; (J.M.R.); (M.R.B.); (P.S.); (K.J.D.A.E.)
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Zhang Q, Cheng S, Wang Y, Wang M, Lu Y, Wen Z, Ge Y, Ma Q, Chen Y, Zhang Y, Cao R, Li M, Liu W, Wang B, Wu Q, Jia W, Wang X. Interrogation of the microenvironmental landscape in spinal ependymomas reveals dual functions of tumor-associated macrophages. Nat Commun 2021; 12:6867. [PMID: 34824203 PMCID: PMC8617028 DOI: 10.1038/s41467-021-27018-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 11/01/2021] [Indexed: 02/01/2023] Open
Abstract
Spinal ependymomas are the most common spinal cord tumors in adults, but their intratumoral cellular heterogeneity has been less studied, and how spinal microglia are involved in tumor progression is still unknown. Here, our single-cell RNA-sequencing analyses of three spinal ependymoma subtypes dissect the microenvironmental landscape of spinal ependymomas and reveal tumor-associated macrophage (TAM) subsets with distinct functional phenotypes. CCL2+ TAMs are related to the immune response and exhibit a high capacity for apoptosis, while CD44+ TAMs are associated with tumor angiogenesis. By combining these results with those of single-cell ATAC-sequencing data analysis, we reveal that TEAD1 and EGR3 play roles in regulating the functional diversity of TAMs. We further identify diverse characteristics of both malignant cells and TAMs that might underlie the different malignant degrees of each subtype. Finally, assessment of cell-cell interactions reveal that stromal cells act as extracellular factors that mediate TAM diversity. Overall, our results reveal dual functions of TAMs in tumor progression, providing valuable insights for TAM-targeting immunotherapy.
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Affiliation(s)
- Qianqian Zhang
- State Key Laboratory of Brain and Cognitive Science, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Brain-Intelligence Technology (Shanghai), Bioland Laboratory (Guangzhou), Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Sijin Cheng
- State Key Laboratory of Brain and Cognitive Science, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Brain-Intelligence Technology (Shanghai), Bioland Laboratory (Guangzhou), Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, China
| | - Yongzhi Wang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, 100070, Beijing, China
- China National Clinical Research Center for Neurological Diseases, 100070, Beijing, China
| | - Mengdi Wang
- State Key Laboratory of Brain and Cognitive Science, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Brain-Intelligence Technology (Shanghai), Bioland Laboratory (Guangzhou), Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, China
| | - Yufeng Lu
- State Key Laboratory of Brain and Cognitive Science, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Brain-Intelligence Technology (Shanghai), Bioland Laboratory (Guangzhou), Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Zengqi Wen
- State Key Laboratory of Brain and Cognitive Science, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Brain-Intelligence Technology (Shanghai), Bioland Laboratory (Guangzhou), Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, China
| | - Yuxin Ge
- State Key Laboratory of Cognitive Neuroscience and Learning, IDG/McGovern Institute for Brain Research, Beijing Normal University, 100875, Beijing, China
| | - Qiang Ma
- State Key Laboratory of Brain and Cognitive Science, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Brain-Intelligence Technology (Shanghai), Bioland Laboratory (Guangzhou), Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Youqiao Chen
- State Key Laboratory of Cognitive Neuroscience and Learning, IDG/McGovern Institute for Brain Research, Beijing Normal University, 100875, Beijing, China
| | - Yaowu Zhang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, 100070, Beijing, China
- China National Clinical Research Center for Neurological Diseases, 100070, Beijing, China
| | - Ren Cao
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, 100070, Beijing, China
- China National Clinical Research Center for Neurological Diseases, 100070, Beijing, China
| | - Min Li
- State Key Laboratory of Brain and Cognitive Science, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Brain-Intelligence Technology (Shanghai), Bioland Laboratory (Guangzhou), Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Weihao Liu
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, 100070, Beijing, China
- China National Clinical Research Center for Neurological Diseases, 100070, Beijing, China
| | - Bo Wang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, 100070, Beijing, China
- China National Clinical Research Center for Neurological Diseases, 100070, Beijing, China
| | - Qian Wu
- State Key Laboratory of Cognitive Neuroscience and Learning, IDG/McGovern Institute for Brain Research, Beijing Normal University, 100875, Beijing, China.
- Chinese Institute for Brain Research, 102206, Beijing, China.
| | - Wenqing Jia
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, 100070, Beijing, China.
- China National Clinical Research Center for Neurological Diseases, 100070, Beijing, China.
| | - Xiaoqun Wang
- State Key Laboratory of Brain and Cognitive Science, CAS Center for Excellence in Brain Science and Intelligence Technology, Institute of Brain-Intelligence Technology (Shanghai), Bioland Laboratory (Guangzhou), Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, China.
- University of Chinese Academy of Sciences, 100049, Beijing, China.
- Chinese Institute for Brain Research, 102206, Beijing, China.
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University & Capital Medical University, 100069, Beijing, China.
- Advanced Innovation Center for Human Brain Protection, Beijing Institute for Brain Disorders, Capital Medical University, 100069, Beijing, China.
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14
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Taniguchi A, Tsuge M, Miyahara N, Tsukahara H. Reactive Oxygen Species and Antioxidative Defense in Chronic Obstructive Pulmonary Disease. Antioxidants (Basel) 2021; 10:antiox10101537. [PMID: 34679673 PMCID: PMC8533053 DOI: 10.3390/antiox10101537] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 02/06/2023] Open
Abstract
The respiratory system is continuously exposed to endogenous and exogenous oxidants. Chronic obstructive pulmonary disease (COPD) is characterized by chronic inflammation of the airways, leading to the destruction of lung parenchyma (emphysema) and declining pulmonary function. It is increasingly obvious that reactive oxygen species (ROS) and reactive nitrogen species (RNS) contribute to the progression and amplification of the inflammatory responses related to this disease. First, we described the association between cigarette smoking, the most representative exogenous oxidant, and COPD and then presented the multiple pathophysiological aspects of ROS and antioxidative defense systems in the development and progression of COPD. Second, the relationship between nitric oxide system (endothelial) dysfunction and oxidative stress has been discussed. Third, we have provided data on the use of these biomarkers in the pathogenetic mechanisms involved in COPD and its progression and presented an overview of oxidative stress biomarkers having clinical applications in respiratory medicine, including those in exhaled breath, as per recent observations. Finally, we explained the findings of recent clinical and experimental studies evaluating the efficacy of antioxidative interventions for COPD. Future breakthroughs in antioxidative therapy may provide a promising therapeutic strategy for the prevention and treatment of COPD.
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Affiliation(s)
- Akihiko Taniguchi
- Department of Hematology, Oncology, Allergy and Respiratory Medicine, Okayama University Academic Field of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan;
| | - Mitsuru Tsuge
- Department of Pediatrics, Okayama University Academic Field of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan;
| | - Nobuaki Miyahara
- Department of Medical Technology, Okayama University Academic Field of Health Sciences, Okayama 700-8558, Japan;
| | - Hirokazu Tsukahara
- Department of Pediatrics, Okayama University Academic Field of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan;
- Correspondence:
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15
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Racanelli AC, Choi AMK, Choi ME. Autophagy in chronic lung disease. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2020; 172:135-156. [PMID: 32620240 DOI: 10.1016/bs.pmbts.2020.02.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The development of chronic lung disease occurs as a consequence of multiple cellular events that involve an initial insult which often leads to the development of chronic inflammation, and the dysregulation of cellular proliferation and cell death mechanisms. Multiple cell types in the lung are key to the respiratory and protective/barrier functions necessary to manage the chronic exposures to environmental, mechanical, and oxidative stressors. Autophagy is essential to lung development and homeostasis, as well as the prevention and development of disease. The cellular process involves the collection and removal of unwanted organelles and proteins through lysosomal degradation. In recent years, investigations have addressed the roles of autophagy and selective autophagy in numerous chronic lung diseases. Here, we highlight recent advances on the role of autophagy in the pathogenesis of asthma, chronic obstructive pulmonary disease and emphysema, pulmonary arterial hypertension, and idiopathic pulmonary fibrosis.
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Affiliation(s)
- Alexandra C Racanelli
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medicine, New York, NY, United States; NewYork-Presbyterian Hospital, Weill Cornell Medicine, New York, NY, United States
| | - Augustine M K Choi
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medicine, New York, NY, United States; NewYork-Presbyterian Hospital, Weill Cornell Medicine, New York, NY, United States
| | - Mary E Choi
- NewYork-Presbyterian Hospital, Weill Cornell Medicine, New York, NY, United States; Division of Nephrology and Hypertension, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medicine, New York, NY, United States.
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16
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Cunningham F, Van Bergen T, Canning P, Lengyel I, Feyen JHM, Stitt AW. The Placental Growth Factor Pathway and Its Potential Role in Macular Degenerative Disease. Curr Eye Res 2019; 44:813-822. [PMID: 31055948 DOI: 10.1080/02713683.2019.1614197] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
There is growing evidence that placental growth factor (PlGF) is an important player in multiple pathologies, including tumorigenesis, inflammatory disorders and degenerative retinopathies. PlGF is a member of the vascular endothelial growth factor (VEGF) family and in the retina, binding of this growth factor to specific receptors is associated with pathological angiogenesis, vascular leakage, neurodegeneration and inflammation. Although they share some receptor signalling pathways, many of the actions of PlGF are distinct from VEGF and this has revealed the enticing prospect that it could be a useful therapeutic target for treating early and late stages of diabetic retinopathy (DR) and neovascular age-related macular degeneration (AMD). Recent research suggests that modulation of PlGF could also be important in the geographic atrophy (GA) form of late AMD by protecting the outer retina and the retinal pigment epithelium (RPE). This review discusses PlGF and its signalling pathways and highlights the potential of blocking the bioactivity of this growth factor to treat irreversible visual loss due to the two main forms of AMD.
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Affiliation(s)
- Fiona Cunningham
- a Centre for Experimental Medicine, Queen's University Belfast , Belfast , Northern Ireland
| | | | - Paul Canning
- a Centre for Experimental Medicine, Queen's University Belfast , Belfast , Northern Ireland
| | - Imre Lengyel
- a Centre for Experimental Medicine, Queen's University Belfast , Belfast , Northern Ireland
| | | | - Alan W Stitt
- a Centre for Experimental Medicine, Queen's University Belfast , Belfast , Northern Ireland
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17
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The role of autophagy in the overexpression of MUC5AC in patients with chronic rhinosinusitis. Int Immunopharmacol 2019; 71:169-180. [PMID: 30909132 DOI: 10.1016/j.intimp.2019.03.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Revised: 02/22/2019] [Accepted: 03/15/2019] [Indexed: 11/23/2022]
Abstract
BACKGROUND Autophagy is a lysosomal degradation pathway that protects the body and is essential for cell survival and differentiation. Mucins (MUCs) are important components of secreted mucus, mucin (MUC)5 AC is the major MUC secreted in the normal airway. OBJECTIVE Investigated the role of autophagy in pathogenic mucin (MUC)5 AC production during chronic rhinosinusitis (CRS). METHODS The expression of human neutrophil elastase (HNE) and the autophagic proteins microtubule-associated protein 1 light chain (LC)3B-II, c-Jun N-terminal kinase (JNK), c-Jun, and MUC5AC were analyzed in the sinonasal mucosa and human nasal epithelial cells (HNECs) using immunohistochemistry, enzyme-linked immunosorbent assay (ELISA), and quantitative real-time polymerase chain reaction (qRT-PCR). Autophagic vacuoles were studied using transmission electron microscopy (TEM). Primary HNECs were treated with HNE, bafilomycin A1, and SP600125. In some experiments, cultured primary HNECs were transfected with small interfering RNAs (siRNAs) to target Beclin-1 (BECN1; BECN1-siRNA), autophagy-related gene 5 (Atg5; Atg5-siRNA), and c-Jun (c-Jun-siRNA). Cultured cells were analyzed using western blotting, qRT-PCR, and ELISA. RESULTS In CRS patients, both with and without nasal polyps, the expression levels of HNE, LC3B, JNK, c-Jun, and MUC5AC were upregulated. Bafilomycin A1 upregulated LC3B-II expression and inhibited MUC secretion in HNE-treated normal primary HNECs. Autophagosomes were observed in HNE-treated primary HNECs using TEM. HNE-induced secretion of MUC5AC was suppressed in normal primary HNECs by BECN1-siRNA, Atg5-siRNA, c-Jun-siRNA, and SP600125. CONCLUSIONS In HNE-induced CRS, autophagy increases the secretion of MUC5AC by promoting the phosphorylation of JNK and c-Jun.
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18
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Protective Features of Autophagy in Pulmonary Infection and Inflammatory Diseases. Cells 2019; 8:cells8020123. [PMID: 30717487 PMCID: PMC6406971 DOI: 10.3390/cells8020123] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 01/29/2019] [Accepted: 01/31/2019] [Indexed: 12/12/2022] Open
Abstract
Autophagy is a highly conserved catabolic process involving autolysosomal degradation of cellular components, including protein aggregates, damaged organelles (such as mitochondria, endoplasmic reticulum, and others), as well as various pathogens. Thus, the autophagy pathway represents a major adaptive response for the maintenance of cellular and tissue homeostasis in response to numerous cellular stressors. A growing body of evidence suggests that autophagy is closely associated with diverse human diseases. Specifically, acute lung injury (ALI) and inflammatory responses caused by bacterial infection or xenobiotic inhalation (e.g., chlorine and cigarette smoke) have been reported to involve a spectrum of alterations in autophagy phenotypes. The role of autophagy in pulmonary infection and inflammatory diseases could be protective or harmful dependent on the conditions. In this review, we describe recent advances regarding the protective features of autophagy in pulmonary diseases, with a focus on ALI, idiopathic pulmonary fibrosis (IPF), chronic obstructive pulmonary disease (COPD), tuberculosis, pulmonary arterial hypertension (PAH) and cystic fibrosis.
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19
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Hou HH, Wang HC, Cheng SL, Chen YF, Lu KZ, Yu CJ. MMP-12 activates protease-activated receptor-1, upregulates placenta growth factor, and leads to pulmonary emphysema. Am J Physiol Lung Cell Mol Physiol 2018; 315:L432-L442. [PMID: 29722565 DOI: 10.1152/ajplung.00216.2017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Because of the expansion of aging and smoking populations, chronic obstructive pulmonary disease (COPD) is predicted to be the third leading cause of death worldwide in 2030. Therefore, it is pertinent to develop effective therapy to improve management for COPD. Cigarette smoke-mediated protease-antiprotease imbalance is a major pathogenic mechanism for COPD and results in massive pulmonary infiltration of neutrophils and macrophages, releasing excessive neutrophil elastase (NE) and matrix metalloproteinases (MMPs). Our previous studies indicated that placenta growth factor (PGF) and PGF-triggered downstream signaling molecules mediate NE-induced lung epithelial cell apoptosis, which is a major pathogenic mechanism for pulmonary emphysema. However, the relationship between MMP-directed COPD and PGF remains elusive. We hypothesize that MMPs may upregulate PGF expression and be involved in MMP-mediated pathogenesis of COPD. In this study, we demonstrate that only MMP-12 can increase the expression of PGF by increasing early-growth response protein 1 (Egr-1) level through the activation of protease-activated receptor 1 (PAR-1). The PGF-mediated downstream signaling molecules drive caspase-3 and caspase-9-dependent apoptosis in bronchial epithelial cells. Both the upregulation of PGF by MMP-12 and PGF downstream signaling molecules with pulmonary apoptosis and emphysema were also demonstrated in animals. Given these findings, we suggest that both human COPD-associated elastases, NE, and MMP-12, upregulate PGF expression and promote the progression of emphysema and COPD.
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Affiliation(s)
- Hsin-Han Hou
- Department of Internal Medicine, National Taiwan University Hospital , Taiwan.,Department of Internal Medicine, National Taiwan University, College of Medicine , Taiwan
| | - Hao-Chien Wang
- Department of Internal Medicine, National Taiwan University Hospital , Taiwan.,Department of Internal Medicine, National Taiwan University, College of Medicine , Taiwan
| | - Shih-Lung Cheng
- Department of Internal Medicine, Far Eastern Memorial Hospital , Taiwan.,Department of Chemical Engineering and Materials Science, Yuan-Ze University , Taiwan
| | - Yen-Fu Chen
- Department of Internal Medicine, National Taiwan University Hospital, Yunlin Branch , Taiwan
| | - Kai-Zen Lu
- Department of Internal Medicine, National Taiwan University Hospital , Taiwan.,Department of Internal Medicine, National Taiwan University, College of Medicine , Taiwan
| | - Chong-Jen Yu
- Department of Internal Medicine, National Taiwan University Hospital , Taiwan.,Department of Internal Medicine, National Taiwan University, College of Medicine , Taiwan
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20
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Wang Y, Liu J, Zhou JS, Huang HQ, Li ZY, Xu XC, Lai TW, Hu Y, Zhou HB, Chen HP, Ying SM, Li W, Shen HH, Chen ZH. MTOR Suppresses Cigarette Smoke-Induced Epithelial Cell Death and Airway Inflammation in Chronic Obstructive Pulmonary Disease. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2018; 200:2571-2580. [PMID: 29507104 DOI: 10.4049/jimmunol.1701681] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 02/12/2018] [Indexed: 12/17/2023]
Abstract
Airway epithelial cell death and inflammation are pathological features of chronic obstructive pulmonary disease (COPD). Mechanistic target of rapamycin (MTOR) is involved in inflammation and multiple cellular processes, e.g., autophagy and apoptosis, but little is known about its function in COPD pathogenesis. In this article, we illustrate how MTOR regulates cigarette smoke (CS)-induced cell death, airway inflammation, and emphysema. Expression of MTOR was significantly decreased and its suppressive signaling protein, tuberous sclerosis 2 (TSC2), was increased in the airway epithelium of human COPD and in mouse lungs with chronic CS exposure. In human bronchial epithelial cells, CS extract (CSE) activated TSC2, inhibited MTOR, and induced autophagy. The TSC2-MTOR axis orchestrated CSE-induced autophagy, apoptosis, and necroptosis in human bronchial epithelial cells; all of which cooperatively regulated CSE-induced inflammatory cytokines IL-6 and IL-8 through the NF-κB pathway. Mice with a specific knockdown of Mtor in bronchial or alveolar epithelial cells exhibited significantly augmented airway inflammation and airspace enlargement in response to CS exposure, accompanied with enhanced levels of autophagy, apoptosis, and necroptosis in the lungs. Taken together, these data demonstrate that MTOR suppresses CS-induced inflammation and emphysema-likely through modulation of autophagy, apoptosis, and necroptosis-and thus suggest that activation of MTOR may represent a novel therapeutic strategy for COPD.
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Affiliation(s)
- Yong Wang
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Juan Liu
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Jie-Sen Zhou
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Hua-Qiong Huang
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Zhou-Yang Li
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Xu-Chen Xu
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Tian-Wen Lai
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Yue Hu
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Hong-Bin Zhou
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Hai-Pin Chen
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Song-Min Ying
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Wen Li
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
| | - Hua-Hao Shen
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
- State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou 510120, China
| | - Zhi-Hua Chen
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China; and
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21
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Racanelli AC, Kikkers SA, Choi AM, Cloonan SM. Autophagy and inflammation in chronic respiratory disease. Autophagy 2018; 14:221-232. [PMID: 29130366 PMCID: PMC5902194 DOI: 10.1080/15548627.2017.1389823] [Citation(s) in RCA: 319] [Impact Index Per Article: 53.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 10/02/2017] [Accepted: 10/05/2017] [Indexed: 12/14/2022] Open
Abstract
Persistent inflammation within the respiratory tract underlies the pathogenesis of numerous chronic pulmonary diseases including chronic obstructive pulmonary disease, asthma and pulmonary fibrosis. Chronic inflammation in the lung may arise from a combination of genetic susceptibility and environmental influences, including exposure to microbes, particles from the atmosphere, irritants, pollutants, allergens, and toxic molecules. To this end, an immediate, strong, and highly regulated inflammatory defense mechanism is needed for the successful maintenance of homeostasis within the respiratory system. Macroautophagy/autophagy plays an essential role in the inflammatory response of the lung to infection and stress. At baseline, autophagy may be critical for inhibiting spontaneous pulmonary inflammation and fundamental for the response of pulmonary leukocytes to infection; however, when not regulated, persistent or inefficient autophagy may be detrimental to lung epithelial cells, promoting lung injury. This perspective will discuss the role of autophagy in driving and regulating inflammatory responses of the lung in chronic lung diseases with a focus on potential avenues for therapeutic targeting. Abbreviations AR allergic rhinitis AM alveolar macrophage ATG autophagy-related CF cystic fibrosis CFTR cystic fibrosis transmembrane conductance regulator COPD chronic obstructive pulmonary disease CS cigarette smoke CSE cigarette smoke extract DC dendritic cell IH intermittent hypoxia IPF idiopathic pulmonary fibrosis ILD interstitial lung disease MAP1LC3B microtubule associated protein 1 light chain 3 beta MTB Mycobacterium tuberculosis MTOR mechanistic target of rapamycin kinase NET neutrophil extracellular traps OSA obstructive sleep apnea PAH pulmonary arterial hypertension PH pulmonary hypertension ROS reactive oxygen species TGFB1 transforming growth factor beta 1 TNF tumor necrosis factor.
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Affiliation(s)
- Alexandra C. Racanelli
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, NY, USA
- New York-Presbyterian Hospital, New York, NY, USA
| | - Sarah Ann Kikkers
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, NY, USA
| | - Augustine M.K. Choi
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, NY, USA
- New York-Presbyterian Hospital, New York, NY, USA
| | - Suzanne M. Cloonan
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, NY, USA
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22
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Abstract
Proteases target many substrates, triggering changes in distinct biological processes correlated with cell migration, EMT/EndMT and fibrosis. Extracellular protease activity, demonstrated by secreted and membrane-bound protease forms, leads to ECM degradation, activation of other proteases (i.e., proteolysis of nonactive zymogens), decomposition of cell-cell junctions, release of sequestered growth factors (TGF-β and VEGF), activation of signal proteins and receptors, degradation of inflammatory inhibitors or inflammation-related proteins, and changes in cell mechanosensing and motility. Intracellular proteases, mainly caspases and cathepsins, modulate lysosome activity and signal transduction pathways. Herein, we discuss the current knowledge on the multidimensional impact of proteases on the development of fibrosis.
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23
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Wu D, Lai T, Yuan Y, Chen M, Xia J, Li W, Pan G, Yuan B, Lv Q, Li Y, Li D, Wu B. Elevated expression of placental growth factor is associated with airway-wall vascular remodelling and thickening in smokers with asthma. Sci Rep 2017; 7:43017. [PMID: 28220848 PMCID: PMC5318961 DOI: 10.1038/srep43017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 01/18/2017] [Indexed: 01/05/2023] Open
Abstract
The increased expression of placental growth factor (PlGF) in chronic obstructive pulmonary disease and allergy-related asthma suggests its role in the pathogenesis of these diseases. In asthmatic smokers, airway remodelling is accompanied by an accelerated decline in lung function. However, whether PlGF contributes to the persistent airflow obstruction and vascular remodelling typically seen in asthmatic smokers is unknown. In this study we measured lung function, airway-wall thickening, and PlGF levels in serum and induced sputum in 74 asthmatic and 42 healthy smokers and never-smokers. Using human lung microvascular endothelial cells (HLMECs), we evaluated the in vitro effects of PlGF on each step of vascular remodelling, including proliferation, migration, stress-fibre expression, and tubule formation. Our data showed significantly higher serum and sputum PlGF levels in asthma patients, especially asthmatic smokers, than in healthy controls. Serum and sputum PlGF levels correlated negatively with post-bronchodilator forced expiratory volume in 1 s (FEV1) and the FEV1/forced vital capacity, but positively with airway-wall thickening. Stimulation of HLMECs with rhPlGF promoted all of the steps of airway-microvascular remodelling. These findings provide insights into the influence of cigarette smoking on the structural changes in the airways of asthmatics and the important pathogenic role played by PlGF.
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Affiliation(s)
- Dong Wu
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Tianwen Lai
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Yalian Yuan
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Min Chen
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Jun Xia
- Department of Radiology, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Wen Li
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Guihai Pan
- Department of Radiology, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Binfan Yuan
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Quanchao Lv
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Yanyu Li
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Dongmin Li
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Bin Wu
- Institute of Respiratory Diseases, Department of Respiratory, The Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
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Aggarwal S, Mannam P, Zhang J. Differential regulation of autophagy and mitophagy in pulmonary diseases. Am J Physiol Lung Cell Mol Physiol 2016; 311:L433-52. [PMID: 27402690 PMCID: PMC5504426 DOI: 10.1152/ajplung.00128.2016] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 07/01/2016] [Indexed: 12/26/2022] Open
Abstract
Lysosomal-mediated degradation of intracellular lipids, proteins and organelles, known as autophagy, represents a inducible adaptive response to lung injury resulting from exposure to insults, such as hypoxia, microbes, inflammation, ischemia-reperfusion, pharmaceuticals (e.g., bleomycin), or inhaled xenobiotics (i.e., air pollution, cigarette smoke). This process clears damaged or toxic cellular constituents and facilitates cell survival in stressful environments. Autophagic degradation of dysfunctional or damaged mitochondria is termed mitophagy. Enhanced mitophagy is usually an early response to promote survival. However, overwhelming or prolonged mitochondrial damage can induce excessive/pathological levels of mitophagy, thereby promoting cell death and tissue injury. Autophagy/mitophagy is therefore an important modulator in human pulmonary diseases and a potential therapeutic target. This review article will summarize the most recent studies highlighting the role of autophagy/mitophagy and its molecular pathways involved in stress response in pulmonary pathologies.
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Affiliation(s)
- Saurabh Aggarwal
- Division of Molecular and Translational Biomedicine, Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Praveen Mannam
- Department of Pulmonary, Critical Care and Sleep Medicine, Yale University School of Medicine, New Haven, Connecticut; and
| | - Jianhua Zhang
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama
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25
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Kim KH, Song HH, Ahn KS, Oh SR, Sadikot RT, Joo M. Ethanol extract of the tuber of Alisma orientale reduces the pathologic features in a chronic obstructive pulmonary disease mouse model. JOURNAL OF ETHNOPHARMACOLOGY 2016; 188:21-30. [PMID: 27154406 DOI: 10.1016/j.jep.2016.05.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 04/20/2016] [Accepted: 05/02/2016] [Indexed: 06/05/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The tuber of Alismataceae Alisma orientale Juzepzuk has been prescribed as a remedy for treating the diseases associated with body fluid dysfunction such as edema and inflammatory lung diseases. Chronic obstructive pulmonary disease (COPD) is a debilitating, inflammatory lung disease without effective treatment. Along with persistent inflammation, autophagy has been recently reported to contribute to COPD. Here, by employing a murine model, we examined whether the tuber of the plant is effective against COPD MATERIALS AND METHODS: The ethanol extract of the tuber of A. orientale Juzepzuk (EEAO) was fingerprinted by HPLC. For the establishment of COPD lung, mice received single intratracheal (i.t.) spraying of elastase and LPS per week for 2 weeks. After approximated to the dose prescribed typically to patients, EEAO was administered to the lung 2h after each LPS treatment. Morphometric analyses, semi-quantitative RT-PCR, and western blot were performed to evaluate the effects of EEAO on emphysema, inflammation, and autophagy in mouse lungs. The effect of EEAO on autophagy was also assessed by western blot at the cellular level with murine macrophages and human lung epithelial cells. RESULTS When receiving i.t. elastase and LPS for 2 weeks, mice developed emphysema and inflammation in the lung. EEAO treatment, however, significantly reduced emphysema and inflammatory cell infiltration to the lung with concomitant decrease of the production of pro-inflammatory cytokines including TNF-α, IL-6, and TGF-β, signature cytokines of COPD. Unlike control mice, the lungs of the COPD mice expressed LC3-II, a biomarker for autophagy formation, which was decreased by EEAO treatment. EEAO also lowered the expression of LC3-II in murine macrophage, RAW 264.7, and human lung epithelial cell, BEAS-2B, which was associated with EEAO activating mTOR. CONCLUSION EEAO relieved COPD pathologic features in a mouse model, which was associated with suppression of lung inflammation, emphysema, and autophagy. Our results suggest an effectiveness of the tuber of A. orientale in chronic inflammatory lung diseases such as COPD.
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Affiliation(s)
- Kyun Ha Kim
- School of Korean Medicine, Pusan National University, Yangsan 626-870, Republic of Korea
| | - Hyuk-Hwan Song
- R&D Team, Agency for Korea National Food Cluster, 460 Iksan-Daero, Iksan, Jeonbuk 507-749, Republic of Korea
| | - Kyung-Seop Ahn
- Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology, Ochang, Chung-Buk 363-883, Republic of Korea
| | - Sei-Ryang Oh
- Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology, Ochang, Chung-Buk 363-883, Republic of Korea
| | - Ruxana T Sadikot
- Pulmonary, Critical Care and Sleep Medicine, School of Medicine, Emory University, 1670 Clairmont Rd., Decatur, GA 30033, United States
| | - Myungsoo Joo
- School of Korean Medicine, Pusan National University, Yangsan 626-870, Republic of Korea.
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26
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Zhang L, Zhao S, Yuan L, Wu H, Jiang H, Luo G. Placenta growth factor contributes to cell apoptosis and epithelial-to-mesenchymal transition in the hyperoxia-induced acute lung injury. Life Sci 2016; 156:30-37. [DOI: 10.1016/j.lfs.2016.05.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 05/06/2016] [Accepted: 05/17/2016] [Indexed: 01/10/2023]
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27
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Liang N, Zhong R, Hou X, Zhao G, Ma S, Cheng G, Liu X. Ataxia-telangiectasia mutated (ATM) participates in the regulation of ionizing radiation-induced cell death via MAPK14 in lung cancer H1299 cells. Cell Prolif 2015; 48:561-72. [PMID: 26269117 DOI: 10.1111/cpr.12203] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 06/20/2015] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVES The role of Ataxia-telangiectasia mutated (ATM) in response to DNA damage has previously been studied, but its underlying mechanisms specific to ionizing radiation (IR) have remained to be elucidated. In this study, function of ATM on radiation-induced cell death in lung cancer H1299 cells was analysed. MATERIALS AND METHODS Human lung cancer cells, H1299, were used, and cell models with ATM(-/-) and MAPK14(-/-) were established by genetic engineering. Radiosensitivity was analysed using colony formation assays. Western blotting and co-immunoprecipitation were implemented to detect protein expression and interaction. MDC staining and GFP-LC3 relocalization were used to detect autophagy. RESULTS Autophagy as well as phosphorylation of ATM was activated by ionizing radiation. Both the inhibitor of ATM, KU55933 and ATM silencing reduced phosphorylation of ATM and MAPKAPK2 expression. Both ATM(-/-) and MAPK14(-/-) cells displayed hypersensitivity. IR increased autophagy level by more than 129% in DMSO-treated cells, while only by 47% and 27% in KU55933-treated and ATM(-/-) cells respectively. MAPK14 knock-down alone gave rise to the basal autophagy level, but decreased notably after IR. KU55933 and ATM knock-down inhibited IR-induced autophagy by activating mTOR pathways. Both Beclin1-PI3KIII and Beclin1-MAPKAPK2 interactions as were remarkably affected by silencing either ATM or MAPK14. CONCLUSIONS ATM promoted IR-induced autophagy via the MAPK14 pathway, mTOR pathway and Beclin1/PI3KIII complexes. MAPK14 contributed to radiosensitization of H1299 cells.
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Affiliation(s)
- Nan Liang
- Key Laboratory of Radiobiology (Ministry of Health), School of Public Health, Jilin University, Changchun, 130021, China.,University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Rui Zhong
- Key Laboratory of Radiobiology (Ministry of Health), School of Public Health, Jilin University, Changchun, 130021, China
| | - Xue Hou
- Department of Radiation Oncology, 1st Hospital Affiliated to Jilin University, Changchun, 130021, China
| | - Gang Zhao
- Key Laboratory of Radiobiology (Ministry of Health), School of Public Health, Jilin University, Changchun, 130021, China
| | - Shumei Ma
- Key Laboratory of Radiobiology (Ministry of Health), School of Public Health, Jilin University, Changchun, 130021, China.,University of Manitoba, Manitoba Institute of Cell Biology, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Guanghui Cheng
- Department of Radiation Oncology, China-Japan Union Hospital of Jilin University, Changchun, 130021, China
| | - Xiaodong Liu
- Key Laboratory of Radiobiology (Ministry of Health), School of Public Health, Jilin University, Changchun, 130021, China.,Department of Radiation Oncology, 1st Hospital Affiliated to Jilin University, Changchun, 130021, China
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28
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Hou HH, Cheng SL, Chung KP, Wei SC, Tsao PN, Lu HH, Wang HC, Yu CJ. PlGF mediates neutrophil elastase-induced airway epithelial cell apoptosis and emphysema. Respir Res 2014; 15:106. [PMID: 25186164 PMCID: PMC4267747 DOI: 10.1186/s12931-014-0106-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Accepted: 08/21/2014] [Indexed: 11/25/2022] Open
Abstract
Background Chronic pulmonary obstructive disease (COPD) has become the fourth leading cause of death worldwide. Cigarette smoking induces neutrophil elastase (NE) and contributes to COPD, but the detailed mechanisms involved are not fully established. In an animal model of pulmonary emphysema, there are increased expressions of placenta growth factor (PlGF) and lung epithelial (LE) cell apoptosis. This study hypothesized that excessive NE may up-regulate PlGF and that PlGF-induced LE apoptosis mediates the pathogenesis of pulmonary emphysema. Methods Human bronchial epithelial cells, BEAS-2B, and primary mouse type II alveolar epithelial cells were treated with NE. The PlGF promoter activity was examined by luciferase activity assay, while PlGF expression and secretion were evaluated by RT-PCR, Western blotting, and ELISA. Both cell lines were treated with PlGF to evaluate its effects and the downstream signaling pathways leading to LE cell apoptosis. PlGF knockout and wild-type mice were instilled with NE to determine the roles of PlGF and its downstream molecules in NE-promoted mice pulmonary apoptosis and emphysema phenotype. Results The transcriptional factor, early growth response gene-1, was involved in the NE-promoted PlGF promoter activity, and the expression and secretion of PlGF mRNA and protein in LE cells. PlGF-induced LE cell apoptosis and NE-induced mice pulmonary apoptosis and emphysema were mediated by the downstream c-Jun N-terminal kinase (JNK) and protein kinase C (PKC)δ signaling pathways. Conclusion The NE-PlGF-JNK/PKCδ pathway contributes to the pathogenesis of LE cell apoptosis and emphysema. PlGF and its downstream signaling molecules may be potential therapeutic targets for COPD. Electronic supplementary material The online version of this article (doi:10.1186/s12931-014-0106-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hsin-Han Hou
- Departments of Internal Medicine, National Taiwan University Hospital, No. 7, Chung-Shan South Road, Taipei, Taiwan. .,Department of Internal Medicine, National Taiwan University, College of Medicine, Taipei, Taiwan.
| | - Shih-Lung Cheng
- Department of Internal Medicine, Far Eastern Memorial Hospital, New Taipei City, Taiwan. .,Department of Chemical Engineering and Materials Science, Yuan-Ze University, Taoyuan, Taiwan.
| | - Kuei-Pin Chung
- Departments of Laboratory Medicine, National Taiwan University Hospital, No. 7, Chung-Shan South Road, Taipei, Taiwan.
| | - Shu-Chen Wei
- Departments of Pediatrics, National Taiwan University Hospital, No. 7, Chung-Shan South Road, Taipei, Taiwan.
| | - Po-Nien Tsao
- Departments of Pediatrics, National Taiwan University Hospital, No. 7, Chung-Shan South Road, Taipei, Taiwan.
| | - Hsuan-Hsuan Lu
- Departments of Internal Medicine, National Taiwan University Hospital, No. 7, Chung-Shan South Road, Taipei, Taiwan. .,Department of Internal Medicine, National Taiwan University, College of Medicine, Taipei, Taiwan.
| | - Hao-Chien Wang
- Departments of Internal Medicine, National Taiwan University Hospital, No. 7, Chung-Shan South Road, Taipei, Taiwan. .,Department of Internal Medicine, National Taiwan University, College of Medicine, Taipei, Taiwan.
| | - Chong-Jen Yu
- Departments of Internal Medicine, National Taiwan University Hospital, No. 7, Chung-Shan South Road, Taipei, Taiwan. .,Department of Internal Medicine, National Taiwan University, College of Medicine, Taipei, Taiwan.
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