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Yu PR, Tseng CY, Hsu CC, Chen JH, Lin HH. In vitro and in vivo protective potential of quercetin-3-glucuronide against lipopolysaccharide-induced pulmonary injury through dual activation of nuclear factor-erythroid 2 related factor 2 and autophagy. Arch Toxicol 2024; 98:1415-1436. [PMID: 38436694 DOI: 10.1007/s00204-024-03691-9] [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: 10/30/2023] [Accepted: 01/23/2024] [Indexed: 03/05/2024]
Abstract
In vitro and in vivo models of lipopolysaccharide (LPS)-induced pulmonary injury, quercetin-3-glucuronide (Q3G) has been previously revealed the lung-protective potential via downregulation of inflammation, pyroptotic, and apoptotic cell death. However, the upstream signals mediating anti-pulmonary injury of Q3G have not yet been clarified. It has been reported that concerted dual activation of nuclear factor-erythroid 2 related factor 2 (Nrf2) and autophagy may prove to be a better treatment strategy in pulmonary injury. In this study, the effect of Q3G on antioxidant and autophagy were further investigated. Noncytotoxic doses of Q3G abolished the LPS-caused cell injury, and reactive oxygen species (ROS) generation with inductions in Nrf2-antioxidant signaling. Moreover, Q3G treatment repressed Nrf2 ubiquitination, and enhanced the association of Keap1 and p62 in the LPS-treated cells. Q3G also showed potential in inducing autophagy, as demonstrated by formation of acidic vesicular organelles (AVOs) and upregulation of autophagy factors. Next, the autolysosomes formation and cell survival were decreased by Q3G under pre-treatment with a lysosome inhibitor, chloroquine (CQ). Furthermore, mechanistic assays indicated that anti-pulmonary injury effects of Q3G might be mediated via Nrf2 signaling, as confirmed by the transfection of Nrf2 siRNA. Finally, Q3G significantly alleviated the development of pulmonary injury in vivo, which may result from inhibiting the LPS-induced lung dysfunction and edema. These findings emphasize a toxicological perspective, providing new insights into the mechanisms of Q3G's protective effects on LPS-induced pulmonary injury and highlighting its role in dual activating Nrf2 and autophagy pathways.
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Affiliation(s)
- Pei-Rong Yu
- Department of Nutrition, Chung Shan Medical University, Taichung City, 40201, Taiwan
| | - Chiao-Yun Tseng
- Department of Nutrition, Chung Shan Medical University, Taichung City, 40201, Taiwan
| | - Cheng-Chin Hsu
- Department of Nutrition, Chung Shan Medical University, Taichung City, 40201, Taiwan
| | - Jing-Hsien Chen
- Department of Nutrition, Chung Shan Medical University, Taichung City, 40201, Taiwan
- Clinical Laboratory, Chung Shan Medical University Hospital, Taichung City, 40201, Taiwan
| | - Hui-Hsuan Lin
- Clinical Laboratory, Chung Shan Medical University Hospital, Taichung City, 40201, Taiwan.
- Department of Medical Laboratory and Biotechnology, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Road, Taichung City, 40201, Taiwan.
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Tang SC, Lu CT, Ko JL, Lin CH, Hsiao YP. Hydroxychloroquine repairs burn damage through the Wnt/β-catenin pathway. Chem Biol Interact 2023; 370:110309. [PMID: 36535310 DOI: 10.1016/j.cbi.2022.110309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 11/22/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022]
Affiliation(s)
- Sheau-Chung Tang
- Department of Nursing, National Taichung University of Science and Technology, Taichung, 40640, Taiwan
| | - Chun-Te Lu
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan; Institute of Medicine, School of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Jiunn-Liang Ko
- Department of Medical Oncology and Chest Medicine, Chung Shan Medical University Hospital, Taichung, 402, Taiwan; Institute of Medicine, School of Medicine, Chung Shan Medical University, Taichung, Taiwan
| | - Cheng-Hui Lin
- Institute of Medicine, School of Medicine, Chung Shan Medical University, Taichung, Taiwan
| | - Yu-Ping Hsiao
- Department of Dermatology, Chung Shan Medical University Hospital, Taichung, Taiwan; Institute of Medicine, School of Medicine, Chung Shan Medical University, Taichung, Taiwan.
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3
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Kong M, Wei D, Li X, Zhu X, Hong Z, Ni M, Wang Y, Dong A. The dynamic changes in autophagy activity and its role in lung injury after deep hypothermic circulatory arrest. J Cell Mol Med 2022; 26:1113-1127. [PMID: 35014165 PMCID: PMC8831962 DOI: 10.1111/jcmm.17165] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 11/22/2021] [Accepted: 12/09/2021] [Indexed: 12/27/2022] Open
Abstract
Deep hypothermic circulatory arrest (DHCA) can cause acute lung injury (ALI), and its pathogenesis mimics ischaemia/reperfusion (I/R) injury. Autophagy is also involved in lung I/R injury. The present study aimed to elucidate whether DHCA induces natural autophagy activation and its role in DHCA‐mediated lung injury. Here, rats were randomly assigned to the Sham or DHCA group. The sham group (n = 5) only received anaesthesia and air intubation. DHCA group rats underwent cardiopulmonary bypass (CPB) followed by the DHCA procedure. The rats were then sacrificed at 3, 6 and 24 h after the DHCA procedure (n = 5) to measure lung injury and autophagy activity. Chloroquine (CQ) was delivered to evaluate autophagic flux. DHCA caused lung injury, which was prominent 3–6 h after DHCA, as confirmed by histological examination and inflammatory cytokine quantification. Lung injury subsided at 24 h. Autophagy was suppressed 3 h but was exaggerated at 6 h. At both time points, autophagic flux appeared uninterrupted. To further assess the role of autophagy in DHCA‐mediated lung injury, the autophagy inducer rapamycin and its inhibitor 3‐methyladenine (3‐MA) were applied, and lung injury was reassessed. When rapamycin was administered at an early time point, lung injury worsened, whereas administration of 3‐MA at a late time point ameliorated lung injury, indicating that autophagy contributed to lung injury after DHCA. Our study presents a time course of lung injury following DHCA. Autophagy showed adaptive yet protective suppression 3 h after DHCA, as induction of autophagy caused worsening of lung tissue. In contrast, autophagy was exaggerated 6 h after DHCA, and autophagy inhibition attenuated DHCA‐mediated lung injury.
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Affiliation(s)
- Minjian Kong
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Dongdong Wei
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Xuebiao Li
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Xian Zhu
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Ze Hong
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Ming Ni
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Yifan Wang
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Aiqiang Dong
- Department of Cardiovascular Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
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Sharma P, Alizadeh J, Juarez M, Samali A, Halayko AJ, Kenyon NJ, Ghavami S, Zeki AA. Autophagy, Apoptosis, the Unfolded Protein Response, and Lung Function in Idiopathic Pulmonary Fibrosis. Cells 2021; 10:1642. [PMID: 34209019 PMCID: PMC8307368 DOI: 10.3390/cells10071642] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 06/21/2021] [Accepted: 06/23/2021] [Indexed: 01/18/2023] Open
Abstract
Autophagy, apoptosis, and the unfolded protein response (UPR) are fundamental biological processes essential for manifold cellular functions in health and disease. Idiopathic pulmonary fibrosis (IPF) is a progressive and lethal pulmonary disorder associated with aging that has limited therapies, reflecting our incomplete understanding. We conducted an observational study linking molecular markers of cell stress response pathways (UPR: BiP, XBP1; apoptosis: cleaved caspase-3; autophagy: LC3β) in lung tissues from IPF patients and correlated the expression of these protein markers to each subject's lung function measures. We hypothesized that changes in lung tissue expression of apoptosis, autophagy, and UPR markers correlate with lung function deficits in IPF. The cell stress markers BiP, XBP1, LC3β puncta, and cleaved caspase-3 were found to be elevated in IPF lungs compared to non-IPF lungs, and, further, BiP and cleaved caspase-3 co-localized in IPF lungs. Considering lung function independently, we observed that increased XBP1, BiP, and cleaved caspase-3 were each associated with reduced lung function (FEV1, FVC, TLC, RV). However, increased lung tissue expression of LC3β puncta was significantly associated with increased diffusion capacity (DLCO), an indicator of alveolar-capillary membrane function. Similarly, the co-localization of UPR (XBP1, BiP) and autophagy (LC3β puncta) markers was positively correlated with increased lung function (FEV1, FVC, TLC, DLCO). However, the presence of LC3β puncta can indicate either autophagy flux inhibition or activation. While the nature of our observational cross-sectional study design does not allow conclusions regarding causal links between increased expression of these cell stress markers, lung fibrosis, and lung function decline, it does provide some insights that are hypothesis-generating and suggests that within the milieu of active UPR, changes in autophagy flux may play an important role in determining lung function. Further research is necessary to investigate the mechanisms linking UPR and autophagy in IPF and how an imbalance in these cell stress pathways can lead to progressive fibrosis and loss of lung function. We conclude by presenting five testable hypotheses that build on the research presented here. Such an understanding could eventually lead to the development of much-needed therapies for IPF.
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Affiliation(s)
- Pawan Sharma
- Center for Translational Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, Jane & Leonard Korman Respiratory Institute, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA;
| | - Javad Alizadeh
- Department of Human Anatomy and Cell Science, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E 3P4, Canada;
| | - Maya Juarez
- Davis Lung Center, School of Medicine; Division of Pulmonary, Critical Care, and Sleep Medicine, University of California, Davis, CA 95616, USA; (M.J.); (N.J.K.)
| | - Afshin Samali
- Apoptosis Research Centre, School of Natural Sciences, National University of Ireland, H91 W2TY Galway, Ireland;
| | - Andrew J. Halayko
- Department of Physiology and Pathophysiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E 3P4, Canada;
| | - Nicholas J. Kenyon
- Davis Lung Center, School of Medicine; Division of Pulmonary, Critical Care, and Sleep Medicine, University of California, Davis, CA 95616, USA; (M.J.); (N.J.K.)
- Veterans Affairs Medical Center, Mather, CA 95655, USA
| | - Saeid Ghavami
- Department of Human Anatomy and Cell Science, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E 3P4, Canada;
- Research Institute of Hematology and Oncology, Cancer Care Manitoba, Winnipeg, MB R3E 0V9, Canada
- Faculty of Medicine, Katowice School of Technology, 40-555 Katowice, Poland
- Autophagy Research Center, Shiraz University of Medical Sciences, Shiraz 7134845794, Iran
| | - Amir A. Zeki
- Davis Lung Center, School of Medicine; Division of Pulmonary, Critical Care, and Sleep Medicine, University of California, Davis, CA 95616, USA; (M.J.); (N.J.K.)
- Veterans Affairs Medical Center, Mather, CA 95655, USA
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5
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Liu J, Liang R, Huang H, Zhang Y, Xie A, Zhong Y. Effect of an Antagonistic Peptide of CCR5 on the Expression of Autophagy-related Genes and β-Arrestin 2 in Lung Tissues of Asthmatic Mice. ALLERGY, ASTHMA & IMMUNOLOGY RESEARCH 2021; 13:106-121. [PMID: 33191680 PMCID: PMC7680831 DOI: 10.4168/aair.2021.13.1.106] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 05/31/2020] [Accepted: 06/09/2020] [Indexed: 12/20/2022]
Abstract
Purpose The mechanisms of CC chemokine receptor 5 (CCR5) in the process of autophagy remain unknown. In this study, we examined the role of HY peptide, which is an antagonistic peptide specifically binding the second extracellular loop of CCR5, in the expression of autophagy genes and β-arrestin 2 in lung tissues of asthmatic mice. Methods Experimental asthmatic mice were treated with HY peptide and dexamethasone sodium phosphate (Dex). Airway inflammation, autophagy-related genes, autophagic vacuoles (AVs) and β-arrestin 2 were examined in lung tissues, and the correlation between β-arrestin 2 and LC3 expression was assessed. Results HY peptide and Dex treatments alleviate airway inflammation. The expression of autophagy-related genes, such as BECN1, ATG5 and LC3, was decreased in the lung tissues of the asthmatic mice. However, HY peptide and Dex treatments increased the expression of these genes as well as the formation of AVs. Additionally, the expression of the β-arrestin 2 protein was significantly increased in the HY peptide-treated group, and positive cells expressing β-arrestin 2 were mainly located in the membrane and cytoplasm of bronchial epithelial cells. The β-arrestin 2 expression was positively correlated with the expression of LC3 in the model and HY peptide-treated groups. Conclusions HY peptide inhibits airway inflammation, autophagic dysfunction exists in asthmatic mice, and targeting HY peptide increases the expression of autophagy-related genes. Thus, β-arrestin 2 may participate in the mechanisms underlying these processes.
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Affiliation(s)
- Juan Liu
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.,Department of Pediatrics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Rongrong Liang
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.,Department of Pediatrics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Huarong Huang
- Department of Pediatrics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Yingli Zhang
- Department of Pediatrics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Aicen Xie
- Department of Pediatrics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Yingqiang Zhong
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.,Department of Gastroenterology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.
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6
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Hu SQ, Zhang QC, Meng QB, Hu AN, Zou JP, Li XL. Autophagy regulates exosome secretion in rat nucleus pulposus cells via the RhoC/ROCK2 pathway. Exp Cell Res 2020; 395:112239. [PMID: 32828826 DOI: 10.1016/j.yexcr.2020.112239] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 08/14/2020] [Accepted: 08/17/2020] [Indexed: 12/13/2022]
Abstract
Our present study investigated whether exosome secretion of nucleus pulposus cells (NPCs) is regulated by autophagy. Different autophagic states of NPCs were induced by rapamycin (Rap), bafilomycin A1 (Baf) and other agents, and it was found that exosomes were secreted in an autophagy-dependent manner. Activation or inhibition of autophagy increased or decreased, respectively, the amount of exosomes that were released into the extracellular space. In addition, in order to confirm that Rap-promoted release of exosomes was mediated by autophagy rather than other pathways, we used autophagy associated gene 5 (ATG5) small-interfering RNA (siRNA) to silence the expression of ATG5 gene, which is indispensable for autophagy. The results showed that siRNA against ATG5 (siATG5) induced an accumulation of intraluminal vesicles (ILVs) in NPCs and a concomitant decrease in the amount of exosomes isolated from supernatant. Ras homolog gene (Rho) and Rho-associated coiled-coil forming protein kinase (ROCK) family molecules are capable of cytoskeletal remodeling and affecting vesicle transport. Therefore, we carried out targeted interventions and evaluated the effects of the RhoC/ROCK2 pathway on the secretion of exosomes within autophagic environment. Knockdown of RhoC and ROCK2 with corresponding siRNA significantly inhibited the secretion of exosomes originating from ILVs in NPCs, even when NPCs were subsequently treated with Rap. Taken together, our findings suggest that autophagy positively regulates expression levels of RhoC and ROCK2, and that the RhoC/ROCK2 pathway exerts a key function on NPCs-derived exosome secretion.
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Affiliation(s)
- Shun-Qi Hu
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Qi-Chen Zhang
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Qing-Bing Meng
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - An-Nan Hu
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Jia-Peng Zou
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Xi-Lei Li
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, 200032, China.
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Fang L, Shen Q, Wu H, He F, Ding P, Xu K, Yan X, Wang M, Li S, Liu R. TLR2 favors OVA-induced allergic airway inflammation in mice through JNK signaling pathway with activation of autophagy. Life Sci 2020; 256:117896. [PMID: 32504758 DOI: 10.1016/j.lfs.2020.117896] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 05/21/2020] [Accepted: 05/31/2020] [Indexed: 12/15/2022]
Abstract
AIMS Numerous studies indicate that toll-like receptor 2 (TLR2) led to divergent effects in asthma. The occurrence of autophagy in asthma pathogenesis is still incompletely understood. Here, we aimed to investigate the role of TLR2 and the underlying mechanisms in allergic airway inflammation and autophagy activation. MAIN METHODS C57BL/6 and TLR2 knockout (TLR2-/-) mice were subjected to an ovalbumin (OVA)-immunized allergic airway model, and were treated with SP600125. Differential cell counts in bronchoalveolar lavage fluid were determined by Wright's staining. Histological analysis of airway inflammation was determined by haematoxylin and eosin (H&E) and periodic acid-Schiff (PAS) staining. The levels of OVA-specific immunoglobulin E (IgE), tumor necrosis factor α (TNF-α) and interleukin 10 (IL-10) were detected by enzyme-linked immunosorbent assay (ELISA). Proteins expression in lung tissues was detected by western blot, expression of TLR2 was further observed by immunofluorescence. Autophagy activation was determined by western blot and transmission electron microscopy (TEM). KEY FINDINGS TLR2 expression was increased upon OVA challenge, and TLR2 deficiency was associated with decreased allergic airway inflammation. Meanwhile, TLR2 deficiency weakened autophagy activation. Moreover, inhibition of c-Jun N-terminal kinase (JNK) by SP600125 also suppressed OVA-induced allergic airway inflammation and autophagy activation. Interestingly, treating TLR2-/- mice with SP600125 showed similar OVA-induced allergic airway inflammation and autophagy activation compared to that in vehicle-treated TLR2-/- mice. SIGNIFICANCE TLR2 might contribute to the maintenance of allergic airway inflammation through JNK signaling pathway accompanying with autophagy activation. These findings may provide a novel signal target for prevention of allergic airway inflammation.
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Affiliation(s)
- Lei Fang
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China
| | - Qiying Shen
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China; Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China
| | - Huimei Wu
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China
| | - Fang He
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China; No.1 Department of Respiratory Medicine, Anhui Chest Hospital, Jixi Road 397, Hefei, Anhui 230022, China
| | - Peishan Ding
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China
| | - Ke Xu
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China; The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230031, China
| | - Xuebo Yan
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China
| | - Muzi Wang
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China
| | - Shuai Li
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China; Intensive Care Unit, The Fourth Affiliated Hospital of Anhui Medical University, Huaihai Avenue 100, Hefei, Anhui 230012, China
| | - Rongyu Liu
- Department of Geriatric Respiratory and Critical Care, Provincial Key Laboratory of Molecular Medicine for Geriatric Disease, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Jixi Road 218, Hefei, Anhui 230022, China.
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8
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Eghtedardoost M, Ghazanfari T, Sadeghipour A, Hassan ZM, Ghanei M, Ghavami S. Delayed effects of sulfur mustard on autophagy suppression in chemically-injured lung tissue. Int Immunopharmacol 2020; 80:105896. [PMID: 31952904 DOI: 10.1016/j.intimp.2019.105896] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 08/26/2019] [Accepted: 09/06/2019] [Indexed: 01/10/2023]
Abstract
BACKGROUND Autophagy is an intracellular hemostasis mechanism, responding to extracellular or intracellular stresses. Sulfur mustard (SM) induces cellular stress. Iranian soldiers exposed to SM gas, during the Iraq-Iran war, suffer from delayed complications even 30 years after exposure. In this study, for exploring the SM effect on autophagy pathway, gene and protein expression of autophagy markers are evaluated in the lung of SM-exposed people. METHODS 52 FFPE lung tissues of SM-exposed people and 33 lung paraffin blocks of non-exposed patients to SM were selected. LC3 and Beclin-1 mRNA expressions were evaluated by QRT-PCR. LC3-B protein and LC3II/LC3I proteins ratio were detected by Immunohistochemistry and immunoblotting method. The collected data were analyzed in SPSS, and P value ≤ 0.05 was considered significant. RESULTS LC3 gene expression in SM-exposed subjects (median CT value = 4.97) increased about 4 fold compared with the control group (median CT value = 0.46, P = 0.025). Beclin-1 mRNA expression had not significant difference between two groups. After adjusting the confounding variables such as drug usage, LC3-B protein (P = 0.041) and LC3II/LC3I ratio (P = 0.044) were found significantly lower in the lung cells of SM-exposed group. CONCLUSION Upon exposure to SM gas, the lung cells are affected by acute cellular stress such as oxidative stress. The study results show that LC3 mRNA level increases in these patients, but, surprisingly, LC3-B protein via unknown mechanism has been down-regulated. N-acetyl cysteine and salbutamol drugs could induce the autophagy, and help to reduce the SM effects and improve the clinical condition of SM-injured patients.
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Affiliation(s)
- Marzieh Eghtedardoost
- Immunoregulation Research Center, Shahed University, Tehran, Iran; Department of Immunology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 14115111, Iran.
| | - Tooba Ghazanfari
- Immunoregulation Research Center, Shahed University, Tehran, Iran; Department of Immunology, Shahed University, Tehran 3319118651, Iran.
| | - Alireza Sadeghipour
- Pathology Department, RasoulAkram Medical Complex, Iran University of Medical Sciences, Tehran, Iran.
| | - Zuhair Mohammad Hassan
- Department of Immunology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 14115111, Iran.
| | - Mostafa Ghanei
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Science, Tehran, Iran
| | - Saeid Ghavami
- Department of Human Anatomy and Cell Science, Rady College of Medicine, Max Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada; Biology of Breathing Theme, Children Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, Canada; Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran; Research Institute of Oncology and Hematology, CancerCare Manitoba, University of Manitoba, Winnipeg, Canada
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9
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TIPRL potentiates survival of lung cancer by inducing autophagy through the eIF2α-ATF4 pathway. Cell Death Dis 2019; 10:959. [PMID: 31862913 PMCID: PMC6925247 DOI: 10.1038/s41419-019-2190-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 12/05/2019] [Accepted: 12/05/2019] [Indexed: 12/11/2022]
Abstract
Autophagy, an intracellular system of degrading damaged organelles and misfolded proteins, is essential for cancer cell survival. Despite the progress made towards understanding the mechanism, identification of novel autophagy regulators presents a major obstacle in developing anticancer therapies. Here, we examine the association between the TOR signaling pathway regulator-like (TIPRL) protein and autophagy in malignant transformation of tumors. We show that TIPRL upregulation in non-small cell lung cancer (NSCLC) potentiated autophagy activity and enabled autophagic clearance of metabolic and cellular stress, conferring a survival advantage to cancer cells. Importantly, the interaction of TIPRL with eukaryotic initiation factor 2α (eIF2α) led to eIF2α phosphorylation and activation of the eIF2α-ATF4 pathway, thereby inducing autophagy. Conversely, TIPRL depletion increased apoptosis by reducing autophagic clearance, which was markedly enhanced in TIPRL-depleted A549 xenografts treated with 2-deoxy-D-glucose. Overall, the study indicated that TIPRL is a potential regulator of autophagy and an important drug target for lung cancer therapy.
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10
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Quan Y, Lei H, Wahafu W, Liu Y, Ping H, Zhang X. Inhibition of autophagy enhances the anticancer effect of enzalutamide on bladder cancer. Biomed Pharmacother 2019; 120:109490. [DOI: 10.1016/j.biopha.2019.109490] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 09/14/2019] [Accepted: 09/22/2019] [Indexed: 10/25/2022] Open
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Abstract
People worldwide are living longer, and it is estimated that by 2050, the proportion of the world's population over 60 years of age will nearly double. Natural lung aging is associated with molecular and physiological changes that cause alterations in lung function, diminished pulmonary remodeling and regenerative capacity, and increased susceptibility to acute and chronic lung diseases. As the aging population rapidly grows, it is essential to examine how alterations in cellular function and cell-to-cell interactions of pulmonary resident cells and systemic immune cells contribute to a higher risk of increased susceptibility to infection and development of chronic diseases, such as chronic obstructive pulmonary disease and interstitial pulmonary fibrosis. This review provides an overview of physiological, structural, and cellular changes in the aging lung and immune system that facilitate the development and progression of disease.
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Affiliation(s)
- Soo Jung Cho
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Weill Cornell Medicine, New York, NY 10065, USA;
| | - Heather W Stout-Delgado
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Weill Cornell Medicine, New York, NY 10065, USA;
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12
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Chen YB. Autophagy and its role in pulmonary hypertension. Aging Clin Exp Res 2019; 31:1027-1033. [PMID: 30406918 DOI: 10.1007/s40520-018-1063-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 10/19/2018] [Indexed: 01/16/2023]
Abstract
Pulmonary hypertension (PH) is a very common kind of pulmonary vascular disease, which can cause a heavier burden on patient's quality of life, even lead to death. Yet, the mechanism of PH is incomprehensive and not so clear nowadays. In recent years, more and more studies show that autophagy plays a pivotal role in the development of PH. Some modalities target on the formation or maturation of autophagosome that has emerged from our increasing knowledge of autophagy machinery, which may prevent or eliminate the process of PH. The deciphering of molecular selectivity of autophagy has also been a source of novel modulators that act specifically on selective forms of autophagy. Tremendous recent progress has opened a new possibility for modulating autophagy in complex diseases. Thus, autophagy may become a prospective choice for treatment of PH. Herein, we reviewed the literatures and discussed the role of autophagy in the development and treatment of PH.
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13
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Brandt N, Gunnarsson TP, Bangsbo J, Pilegaard H. Exercise and exercise training-induced increase in autophagy markers in human skeletal muscle. Physiol Rep 2019; 6:e13651. [PMID: 29626392 PMCID: PMC5889490 DOI: 10.14814/phy2.13651] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 02/22/2018] [Indexed: 12/17/2022] Open
Abstract
Moderately trained male subjects (mean age 25 years; range 19–33 years) completed an 8‐week exercise training intervention consisting of continuous moderate cycling at 157 ± 20 W for 60 min (MOD; n = 6) or continuous moderate cycling (157 ± 20 W) interspersed by 30‐sec sprints (473 ± 79 W) every 10 min (SPRINT; n = 6) 3 days per week. Sprints were followed by 3:24 min at 102 ± 17 W to match the total work between protocols. A muscle biopsy was obtained before, immediately and 2 h after the first training session as well as at rest after the training session. In both MOD and SPRINT, skeletal muscle AMPKThr172 and ULKSer317 phosphorylation was elevated immediately after exercise, whereas mTORSer2448 and ULKSer757 phosphorylation was unchanged. Two hours after exercise LC3I, LC3II and BNIP3 protein content was overall higher than before exercise with no change in p62 protein. In MOD, Beclin1 protein content was higher immediately and 2 h after exercise than before exercise, while there were no differences within SPRINT. Oxphos complex I, LC3I, BNIP3 and Parkin protein content was higher after the training intervention than before in both groups, while there was no difference in LC3II and p62 protein. Beclin1 protein content was higher after the exercise training intervention only in MOD. Together this suggests that exercise increases markers of autophagy in human skeletal muscle within the first 2 h of recovery and 8 weeks of exercise training increases the capacity for autophagy and mitophagy regulation. Hence, the present findings provide evidence that exercise and exercise training regulate autophagy in human skeletal muscle and that this in general was unaffected by interspersed sprint bouts.
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Affiliation(s)
- Nina Brandt
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Thomas P Gunnarsson
- Section of Integrated Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Jens Bangsbo
- Section of Integrated Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Henriette Pilegaard
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Copenhagen, Denmark
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14
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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: 47] [Impact Index Per Article: 9.4] [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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15
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Ji Q, Sun Z, Yang Z, Zhang W, Ren Y, Chen W, Yao M, Nie S. Protective effect of ginsenoside Rg1 on LPS-induced apoptosis of lung epithelial cells. Mol Immunol 2018; 136:168-174. [PMID: 30471963 DOI: 10.1016/j.molimm.2018.11.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 10/08/2018] [Accepted: 11/08/2018] [Indexed: 02/07/2023]
Abstract
Sepsis-induced acute lung injury (ALI) is a life-threatening medical condition with high mortality and morbidity in the critical care units. Though, it was commonly accepted that inflammation and apoptosis of lung epithelial cells played an essential role in the pathogenesis of ALI, the underlying mechanism remain unknown. In our study, we found that LPS-induced cell apoptosis could be counteracted by elevated cell autophagy. In LPS-treated MLE-12 cells, suppression of autophagy via 3-MA could aggravate LPS-induced apoptosis, while activation of autophagy via Rapamycin could effectively impair the apoptosis of MLE-12 cells induced by LPS. In order to further discover the molecular regulation mechanism between apoptosis and autophagy in LPS-treated MLE-12 cells, we demonstrated that autophagy could induced the expression of Nrf2, followed with the decrease of p-p65. Targeted inhibition of Nrf2 could induce enlarged cell apoptosis via increasing the level of p-p65. In addition, we demonstrated that ginsenoside Rg1 protected MLE-12 cells from LPS-induced apoptosis via augmenting autophagy and inducing the expression of Nrf2. Our data implicates that activation of autophagy and Nrf2 by ginsenoside Rg1 may provide a preventive and therapeutic strategy for ALI.
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Affiliation(s)
- Qijian Ji
- Department of Emergency Medicine, Jinling Clinical Medical College of Nanjing Medical University, Nanjing, 210002, PR China; Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, PR China; Department of Critical Care Medicine, Xuyi People's hospital, xuyi, 211700, Jiangsu, PR China.
| | - Zhaorui Sun
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, PR China.
| | - Zhizhou Yang
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, PR China.
| | - Wei Zhang
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, PR China.
| | - Yi Ren
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, PR China.
| | - Weijun Chen
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, PR China.
| | - Mengya Yao
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, PR China.
| | - Shinan Nie
- Department of Emergency Medicine, Jinling Clinical Medical College of Nanjing Medical University, Nanjing, 210002, PR China; Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, PR China.
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16
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Oleuropein Aglycone Protects against MAO-A-Induced Autophagy Impairment and Cardiomyocyte Death through Activation of TFEB. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:8067592. [PMID: 29765503 PMCID: PMC5892212 DOI: 10.1155/2018/8067592] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 01/19/2018] [Accepted: 02/05/2018] [Indexed: 12/13/2022]
Abstract
Age-associated diseases such as neurodegenerative and cardiovascular disorders are characterized by increased oxidative stress associated with autophagy dysfunction. Oleuropein aglycone (OA), the main polyphenol found in olive oil, was recently characterized as an autophagy inducer and a promising agent against neurodegeneration. It is presently unknown whether OA can have beneficial effects in a model of cardiac stress characterized by autophagy dysfunction. Here, we explored the effects of OA in cardiomyocytes with overexpression of monoamine oxidase-A (MAO-A). This enzyme, by degrading catecholamine and serotonin, produces hydrogen peroxide (H2O2), which causes oxidative stress, autophagic flux blockade, and cell necrosis. We observed that OA treatment counteracted the cytotoxic effects of MAO-A through autophagy activation, as displayed by the increase of autophagic vacuoles and autophagy-specific markers (Beclin1 and LC3-II). Moreover, the decrease in autophagosomes and the increase in autolysosomes, indicative of autophagosome-lysosome fusion, suggested a restoration of the defective autophagic flux. Most interestingly, we found that the ability of OA to confer cardioprotection through autophagy induction involved nuclear translocation and activation of the transcriptional factor EB (TFEB). Our data provide strong evidence of the beneficial effects of OA, suggesting its potential use as a nutraceutical agent against age-related pathologies involving autophagy dysfunction, including cardiovascular diseases.
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17
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The Clinical Influence of Autophagy-Associated Proteins on Human Lung Cancer. DISEASE MARKERS 2018; 2018:8314963. [PMID: 29545906 PMCID: PMC5818951 DOI: 10.1155/2018/8314963] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 11/02/2017] [Indexed: 12/11/2022]
Abstract
Exploitation of autophagy might potentially improve therapeutic strategy. Here, we analyzed the protein expression of autophagy-associated genes including LC3A, LC3B, Beclin-1, p62, and Atg5 in 88–131 primary lung tumors by immunohistochemistry (IHC) on tissue-microarrays (TMAs). Additionally, the DNA methylation pattern of LC3A was investigated by bisulfite sequencing (BS) and methylation-specific-PCR (MSP). It turned out that the higher expression of LC3A protein was associated with adenocarcinoma compared to squamous cell carcinoma of lung (p = 0.008), positive staining of LC3B was significantly related to tumor grade (p = 0.006), and the protein expression of Beclin-1 was significantly correlated to pN stage (p = 0.041). The expression of p62 and Atg5 was however not significantly associated with any clinicopathological parameters. Downregulation of LC3A was related to DNA methylation in lung cancer cell lines, while in primary lung tumor samples, protein expression of LC3A was not significantly correlated with DNA methylation, and the methylation status of LC3A was not related to clinicopathological features. Taken together, our results suggest that autophagy-associated proteins such as LC3A, LC3B, and Beclin-1 might be potential biomarkers for subclassification, differentiation, and local metastasis in primary lung tumor, and epigenetic mechanism is partially responsible for gene silencing of LC3A in lung cancer cell lines.
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18
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Kang CH, Molagoda IMN, Choi YH, Park C, Moon DO, Kim GY. Apigenin promotes TRAIL-mediated apoptosis regardless of ROS generation. Food Chem Toxicol 2017; 111:623-630. [PMID: 29247770 DOI: 10.1016/j.fct.2017.12.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 12/08/2017] [Accepted: 12/12/2017] [Indexed: 01/25/2023]
Abstract
Apigenin is a bioactive flavone in several herbs including parsley, thyme, and peppermint. Apigenin possesses anti-cancer and anti-inflammatory properties; however, whether apigenin enhances TRAIL-mediated apoptosis in cancer cells is unknown. In the current study, we found that apigenin enhanced TRAIL-induced apoptosis by promoting caspase activation and death receptor 5 (DR5) expression and a chimeric antibody against DR5 completely blocked the apoptosis. Apigenin also upregulated reactive oxygen species (ROS) generation; however, intriguingly, ROS inhibitors, glutathione (GSH) or N-acetyl-l-cysteine (NAC), moderately increased apigenin/TRAIL-induced apoptosis. Additional results showed that an autophagy inducer, rapamycin, enhanced apigenin/TRAIL-mediated apoptosis by a slight increase of ROS generation. Accordingly, NAC and GSH rather decreased apigenin-induced autophagy formation, suggesting that apigenin-induced ROS generation increased autophagy formation. However, autophagy inhibitors, bafilomycin (BAF) and 3-methyladenine (3-MA), showed different result in apigenin/TRAIL-mediated apoptosis without ROS generation. 3-MA upregulated the apoptosis but remained ROS levels; however, no changes on apoptosis and ROS generation were observed by BAF treatment. Taken together, these findings reveal that apigenin enhances TRAIL-induced apoptosis by activating apoptotic caspases by upregulating DR5 expression regardless of ROS generation, which may be a promising strategy for an adjuvant of TRAIL.
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Affiliation(s)
- Chang-Hee Kang
- Department of Marine Life Sciences, Jeju National University, Jeju 63243, Republic of Korea; Freshwater Bioresources Utilization Bureau, Bioresources Industrialization Research Division, Sangju-si, Gyeongsangbuk-do 37242, Republic of Korea
| | | | - Yung Hyun Choi
- Department of Biochemistry, College of Oriental Medicine, Dong-Eui University, Busan 47340, Republic of Korea
| | - Cheol Park
- Department of Molecular Biology, College of Natural Sciences and Human Ecology, Dong-Eui University, Busan 47340, Republic of Korea
| | - Dong-Oh Moon
- Department of Biology Education, Daegu University, Gyeongsan, Gyeongbuk 38453, Republic of Korea
| | - Gi-Young Kim
- Department of Marine Life Sciences, Jeju National University, Jeju 63243, Republic of Korea.
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19
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Baldanta S, Fernández-Escobar M, Acín-Perez R, Albert M, Camafeita E, Jorge I, Vázquez J, Enríquez JA, Guerra S. ISG15 governs mitochondrial function in macrophages following vaccinia virus infection. PLoS Pathog 2017; 13:e1006651. [PMID: 29077752 PMCID: PMC5659798 DOI: 10.1371/journal.ppat.1006651] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 09/17/2017] [Indexed: 12/17/2022] Open
Abstract
The interferon (IFN)-stimulated gene 15 (ISG15) encodes one of the most abundant proteins induced by interferon, and its expression is associated with antiviral immunity. To identify protein components implicated in IFN and ISG15 signaling, we compared the proteomes of ISG15-/- and ISG15+/+ bone marrow derived macrophages (BMDM) after vaccinia virus (VACV) infection. The results of this analysis revealed that mitochondrial dysfunction and oxidative phosphorylation (OXPHOS) were pathways altered in ISG15-/- BMDM treated with IFN. Mitochondrial respiration, Adenosine triphosphate (ATP) and reactive oxygen species (ROS) production was higher in ISG15+/+ BMDM than in ISG15-/- BMDM following IFN treatment, indicating the involvement of ISG15-dependent mechanisms. An additional consequence of ISG15 depletion was a significant change in macrophage polarization. Although infected ISG15-/- macrophages showed a robust proinflammatory cytokine expression pattern typical of an M1 phenotype, a clear blockade of nitric oxide (NO) production and arginase-1 activation was detected. Accordingly, following IFN treatment, NO release was higher in ISG15+/+ macrophages than in ISG15-/- macrophages concomitant with a decrease in viral titer. Thus, ISG15-/- macrophages were permissive for VACV replication following IFN treatment. In conclusion, our results demonstrate that ISG15 governs the dynamic functionality of mitochondria, specifically, OXPHOS and mitophagy, broadening its physiological role as an antiviral agent. Protein modification by ubiquitin and ubiquitin-like proteins is a key regulatory process of the innate and adaptive immune response. Interferon-stimulated gene 15 product (ISG15) is an ubiquitin-like protein modifier that can reversibly attach to different viral and cellular proteins, mediating potent antiviral responses. In turn, many viruses, including poxviruses, have evolved strategies to antagonize the antiviral and inflammatory effects of the innate immune response in order to keep infected cells alive until virus replication is complete. Here, we describe a novel role for ISG15 in the control of mitochondrial function. Post-translational modifications such as ISGylation regulate essential mitochondrial processes including respiration and mitophagy, and influence macrophage innate immunity signaling. These findings are clinically relevant since mitochondrial dysfunction is seen in many pathologies, such as infectious disease, cancer, and cardiovascular or neurological disorders, among others, underscoring the importance of the relationship between cellular metabolism and immune response.
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Affiliation(s)
- Sara Baldanta
- Department of Preventive Medicine, Public Health and Microbiology, Universidad Autónoma, Madrid, Spain
| | | | - Rebeca Acín-Perez
- Functional Genetics of the Oxidative Phosphorylation System, Centro Nacional de Investigaciones Cardiovasculares Carlos III; Madrid (SPAIN)
| | - Manuel Albert
- Department of Preventive Medicine, Public Health and Microbiology, Universidad Autónoma, Madrid, Spain
| | - Emilio Camafeita
- Laboratory of Cardiovascular Proteomics, Centro Nacional Investigaciones Cardiovasculares Carlos III (CNIC), Madrid (SPAIN)
- Laboratory of Cardiovascular Proteomics, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC) and CIBER de Enfermedades Cardiovasculares (CIBER-CV), Madrid (SPAIN)
| | - Inmaculada Jorge
- Laboratory of Cardiovascular Proteomics, Centro Nacional Investigaciones Cardiovasculares Carlos III (CNIC), Madrid (SPAIN)
- Laboratory of Cardiovascular Proteomics, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC) and CIBER de Enfermedades Cardiovasculares (CIBER-CV), Madrid (SPAIN)
| | - Jesús Vázquez
- Laboratory of Cardiovascular Proteomics, Centro Nacional Investigaciones Cardiovasculares Carlos III (CNIC), Madrid (SPAIN)
- Laboratory of Cardiovascular Proteomics, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC) and CIBER de Enfermedades Cardiovasculares (CIBER-CV), Madrid (SPAIN)
| | - José Antonio Enríquez
- Functional Genetics of the Oxidative Phosphorylation System, Centro Nacional de Investigaciones Cardiovasculares Carlos III; Madrid (SPAIN)
| | - Susana Guerra
- Department of Preventive Medicine, Public Health and Microbiology, Universidad Autónoma, Madrid, Spain
- * E-mail:
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20
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Overaccumulation of p53-mediated autophagy protects against betulinic acid-induced apoptotic cell death in colorectal cancer cells. Cell Death Dis 2017; 8:e3087. [PMID: 28981110 PMCID: PMC5682653 DOI: 10.1038/cddis.2017.485] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Revised: 08/22/2017] [Accepted: 08/24/2017] [Indexed: 12/18/2022]
Abstract
Betulinic acid (BA) exhibits cytotoxic activity against some cancer cells. However, the molecular mechanism of BA against CRC cells was little reported. Here, we proved that BA elicited CRC cells' growth inhibition and apoptosis in a dose-dependent manner. In addition, BA treatment induced autophagy via inhibiting the AKT-MTOR signaling pathway. Inhibition of autophagy by either administration of autophagic inhibitor chloroquine or siRNA-mediated knockdown of ATG5 could augment BA-induced apoptotic cell death as well as inhibition of cell proliferation. Moreover, we found that p53 was firstly activated by short exposure to BA and then was rapidly degraded via the ubiquitin-mediated degradation pathway in both wtp53 and mutp53 CRC cells. Notably, more preferential cytotoxicity of BA was obtained in mutp53 cells (IC50 values: HT29, 125 μM; SW480, 58 μM) rather than wtp53 cells (IC50 values: HCT116, 178 μM). Further experiments demonstrated that siRNA-mediated p53 knockdown attenuated BA-induced autophagy, and forced overexpression of p53 augmented BA-induced autophagy, indicating that p53-enhanced BA-induced autophagy. Moreover, BA enhanced the sensitivity of mutp53 cells to chemotherapy drugs such as 5-FU and ADR by degradation of mutp53. Overall, our study proved that BA could induce CRC cell death by inducing apoptosis and reduce the overaccumulation of BA-induced protective autophagy by degrading wtp53 and mutp53 dependent on the ubiquitin-mediated degradation pathway to achieve killer effect, suggesting that BA might serve as a novel desirable drug for mutp53 cancer therapy.
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21
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Li ZY, Wu YF, Xu XC, Zhou JS, Wang Y, Shen HH, Chen ZH. Autophagy as a double-edged sword in pulmonary epithelial injury: a review and perspective. Am J Physiol Lung Cell Mol Physiol 2017; 313:L207-L217. [DOI: 10.1152/ajplung.00562.2016] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 04/11/2017] [Accepted: 04/30/2017] [Indexed: 01/11/2023] Open
Abstract
Pulmonary epithelial cells form the first line of defense of human airways against foreign irritants and also represent as the primary injury target of these pathogenic assaults. Autophagy is a revolutionary conserved ubiquitous process by which cytoplasmic materials are delivered to lysosomes for degradation when facing environmental and/or developmental changes, and emerging evidence suggests that autophagy plays pivotal but controversial roles in pulmonary epithelial injury. Here we review recent studies focusing on the roles of autophagy in regulating airway epithelial injury induced by various stimuli. Articles eligible for this purpose are divided into two groups according to the eventual roles of autophagy, either protective or deleterious. From the evidence summarized in this review, we draw several conclusions as follows: 1) in all cases when autophagy is decreased from its basal level, autophagy is protective; 2) when autophagy is deleterious, it is generally upregulated by stimulation; and 3) a plausible conclusion is that the endosomal/exosomal pathways may be associated with the deleterious function of autophagy in airway epithelial injury, although this needs to be clarified in future investigations.
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Affiliation(s)
- Zhou-Yang Li
- Department of Respiratory and Critical Care Medicine, Second Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang; and
| | - Yin-Fang Wu
- Department of Respiratory and Critical Care Medicine, Second Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang; and
| | - Xu-Chen Xu
- Department of Respiratory and Critical Care Medicine, Second Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang; and
| | - Jie-Sen Zhou
- Department of Respiratory and Critical Care Medicine, Second Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang; and
| | - Yong Wang
- Department of Respiratory and Critical Care Medicine, Second Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang; and
| | - Hua-Hao Shen
- Department of Respiratory and Critical Care Medicine, Second Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang; and
- State Key Lab of Respiratory Disease, Guangzhou, China
| | - Zhi-Hua Chen
- Department of Respiratory and Critical Care Medicine, Second Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang; and
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22
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Abstract
The pathogenesis of pulmonary diseases is often complex and characterized by multiple cellular events, including inflammation, cell death, and cell proliferation. The mechanisms by which these events are regulated in pulmonary diseases remain poorly understood. Autophagy is an essential process for cellular homeostasis and stress adaptation in eukaryotic cells. This highly conserved cellular process involves the sequestration of cytoplasmic components in double-membrane autophagosomes, which are delivered to lysosomes for degradation. The critical roles of autophagy have been demonstrated in a wide range of pathophysiological conditions. Emerging studies have identified that autophagy plays important roles in the pathogenesis of various lung diseases. In addition, autophagy has been shown to selectively degrade subcellular targets, including proteins, organelles, and pathogens. Here, we highlight the recent advances in the molecular regulation and function of autophagy in lung diseases.
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Affiliation(s)
- Kiichi Nakahira
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medicine, New York, New York
| | - Maria Angelica Pabon Porras
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medicine, New York, New York
| | - Augustine M K Choi
- Division of Pulmonary and Critical Care Medicine, Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medicine, New York, New York
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23
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Lam A, Prabhu R, Gross CM, Riesenberg LA, Singh V, Aggarwal S. Role of apoptosis and autophagy in tuberculosis. Am J Physiol Lung Cell Mol Physiol 2017; 313:L218-L229. [PMID: 28495854 DOI: 10.1152/ajplung.00162.2017] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 05/03/2017] [Accepted: 05/03/2017] [Indexed: 01/08/2023] Open
Abstract
Tuberculosis (TB) is one of the oldest known human diseases and is transmitted by the bacteria Mycobacterium tuberculosis (Mtb). TB has a rich history with evidence of TB infections dating back to 5,800 bc TB is unique in its ability to remain latent in an individual for decades, with the possibility of later reactivation, causing widespread systemic symptoms. Currently, it is estimated that more than one-third of the world's population (~2 billion people) are infected with Mtb. Prolonged periods of therapy and complexity of treatment regimens, especially in active infection, have led to poor compliance in patients being treated for TB. Therefore, it is vitally important to have a thorough knowledge of the pathophysiology of Mtb to understand the disease progression, as well as to develop novel diagnostic tests and treatments. Alveolar macrophages represent both the primary host cell and the first line of defense against the Mtb infection. Apoptosis and autophagy of macrophages play a vital role in the pathogenesis and also in the host defense against Mtb. This review will outline the role of these two cellular processes in defense against Mtb with particular emphasis on innate immunity and explore developing therapies aimed at altering host responses to the disease.
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Affiliation(s)
- Adam Lam
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and
| | - Rohan Prabhu
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and
| | | | - Lee Ann Riesenberg
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and
| | - Vinodkumar Singh
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and
| | - Saurabh Aggarwal
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and
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24
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Li Y, Yu G, Yuan S, Tan C, Lian P, Fu L, Hou Q, Xu B, Wang H. Cigarette Smoke-Induced Pulmonary Inflammation and Autophagy Are Attenuated in Ephx2-Deficient Mice. Inflammation 2017; 40:497-510. [PMID: 28028752 PMCID: PMC5357505 DOI: 10.1007/s10753-016-0495-z] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Cigarette smoke (CS) increases the risk of chronic obstructive pulmonary disease (COPD) by causing inflammation, emphysema, and reduced lung function. Additionally, CS can induce autophagy which contributes to COPD. Arachidonic acid-derived epoxyeicosatrienoic acids (EETs) have promising anti-inflammatory properties that may protect the heart and liver by regulating autophagy. For this reason, the effect of decreased soluble epoxide hydrolase (sEH, Ephx2)-mediated EET hydrolysis on inflammation, emphysema, lung function, and autophagy was here studied in CS-induced COPD in vivo. Adult male wild-type (WT) C57BL/6J and Ephx2−/− mice were exposed to air or CS for 12 weeks, and lung inflammatory responses, air space enlargement (emphysema), lung function, and autophagy were assessed. Lungs of Ephx2−/− mice had a less pronounced inflammatory response and less autophagy with mild distal airspace enlargement accompanied by restored lung function and steady weight gain. These findings support the idea that Ephx2 may hold promise as a therapeutic target for COPD induced by CS, and it may be protective property by inhibiting autophagy.
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Affiliation(s)
- Yunxiao Li
- The Department of Respiratory Medicine, Beijing Friendship Hospital, Capital Medical University, No. 95 Yong An Road, Xichen District, Beijing, 100050, China
| | - Ganggang Yu
- The Department of Respiratory Medicine, Beijing Friendship Hospital, Capital Medical University, No. 95 Yong An Road, Xichen District, Beijing, 100050, China
| | - Shaopeng Yuan
- Beijing Key Laboratory of New Drug Mechanisms and Pharmacological Evaluation Study, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Chunting Tan
- The Department of Respiratory Medicine, Beijing Friendship Hospital, Capital Medical University, No. 95 Yong An Road, Xichen District, Beijing, 100050, China
| | - Puqiao Lian
- Beijing Key Laboratory of New Drug Mechanisms and Pharmacological Evaluation Study, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Lixia Fu
- Beijing Key Laboratory of New Drug Mechanisms and Pharmacological Evaluation Study, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Qi Hou
- Beijing Key Laboratory of New Drug Mechanisms and Pharmacological Evaluation Study, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Bo Xu
- The Department of Respiratory Medicine, Beijing Friendship Hospital, Capital Medical University, No. 95 Yong An Road, Xichen District, Beijing, 100050, China
| | - Haoyan Wang
- The Department of Respiratory Medicine, Beijing Friendship Hospital, Capital Medical University, No. 95 Yong An Road, Xichen District, Beijing, 100050, China.
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25
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Zsiros V, Katz S, Dóczi N, Kiss AL. Autophagy is the key process in the re-establishment of the epitheloid phenotype during mesenchymal-epithelial transition (MET). Exp Cell Res 2017; 352:382-392. [DOI: 10.1016/j.yexcr.2017.02.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 02/14/2017] [Accepted: 02/19/2017] [Indexed: 12/15/2022]
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26
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Ban GY, Pham DL, Trinh THK, Lee SI, Suh DH, Yang EM, Ye YM, Shin YS, Chwae YJ, Park HS. Autophagy mechanisms in sputum and peripheral blood cells of patients with severe asthma: a new therapeutic target. Clin Exp Allergy 2016; 46:48-59. [PMID: 26112695 DOI: 10.1111/cea.12585] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 06/02/2015] [Accepted: 06/19/2015] [Indexed: 01/07/2023]
Abstract
BACKGROUND Autophagy and genetic predisposition have been suggested to potentially play roles in the development of asthma. However, little is known about the role of autophagy in the pathogenesis of severe asthma. OBJECTIVE We compared autophagy in the sputum granulocytes, peripheral blood cells (PBCs) and peripheral blood eosinophils (PBEs) between patients with severe asthma and those with non-severe asthma and investigated the functional effects of autophagy. METHODS We enrolled 36 patients with severe asthma, 14 with non-severe asthma and 23 normal healthy controls in this study. Sputum granulocytes, PBCs and PBEs were isolated from each subject. Autophagy was evaluated based on the expression of microtubule-associated protein light chain 3 (LC3) by Western blot, confocal microscopy, transmission electron microscopy and flow cytometry. IL-8 levels were measured by ELISA. To induce autophagy, HL-60 cells, human primary small airway epithelial cells (SAECs) and A549 cells were treated with IL-5, IL-1β and TNF-α. To inhibit autophagy, PI3K inhibitors (LY29400 and 3-methyladenine [3-MA]) and hydroxychloroquine (HCQ) were used. Knockdown of ATG5 and Beclin-1 was performed in A549 cells, and the therapeutic effects of dexamethasone were evaluated. RESULTS Higher autophagy levels were noted in sputum granulocytes, PBCs and PBEs from patients with severe asthma than from patients with non-severe asthma and healthy controls (P < 0.05 for all). IL-5 increased autophagy levels in both PBCs and PBEs (P < 0.05). 3-MA attenuated the increased expression of LC3-II and eosinophil cationic protein in HL-60 cells induced by IL-5 (P = 0.034 for both). Dexamethasone did not affect autophagy levels in PBEs. IL-1β increased LC3-II expression and IL-8 production (P < 0.01) in SAECs, and this was attenuated by LY294002, 3-MA, HCQ and knockdown of ATG5 and Beclin-1 (in A549 cells) (P < 0.01). CONCLUSIONS AND CLINICAL RELEVANCE Autophagy could play a role in the pathogenesis of severe asthma. Autophagy modulation may be a novel therapeutic target for conventional therapy-resistant severe asthma.
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Affiliation(s)
- G-Y Ban
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - D L Pham
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea.,Department of Biomedical Sciences, The Graduate School, Ajou University, Suwon, South Korea
| | - T H K Trinh
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - S-I Lee
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - D-H Suh
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - E-M Yang
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - Y-M Ye
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - Y S Shin
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - Y-J Chwae
- Department of Biomedical Sciences, The Graduate School, Ajou University, Suwon, South Korea.,Department of Microbiology, Ajou University School of Medicine, Suwon, South Korea
| | - H-S Park
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea.,Department of Biomedical Sciences, The Graduate School, Ajou University, Suwon, South Korea
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Jessop F, Hamilton RF, Rhoderick JF, Shaw PK, Holian A. Autophagy deficiency in macrophages enhances NLRP3 inflammasome activity and chronic lung disease following silica exposure. Toxicol Appl Pharmacol 2016; 309:101-10. [PMID: 27594529 DOI: 10.1016/j.taap.2016.08.029] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 08/20/2016] [Accepted: 08/30/2016] [Indexed: 01/12/2023]
Abstract
Autophagy is an important metabolic mechanism that can promote cellular survival following injury. The specific contribution of autophagy to silica-induced inflammation and disease is not known. The objective of these studies was to determine the effects of silica exposure on the autophagic pathway in macrophages, as well as the general contribution of autophagy in macrophages to inflammation and disease. Silica exposure enhanced autophagic activity in vitro in Bone Marrow derived Macrophages and in vivo in Alveolar Macrophages isolated from silica-exposed mice. Impairment of autophagy in myeloid cells in vivo using Atg5(fl/fl)LysM-Cre(+) mice resulted in enhanced cytotoxicity and inflammation after silica exposure compared to littermate controls, including elevated IL-18 and the alarmin HMGB1 in the whole lavage fluid. Autophagy deficiency caused some spontaneous inflammation and disease. Greater silica-induced acute inflammation in Atg5(fl/fl)LysM-Cre(+) mice correlated with increased fibrosis and chronic lung disease. These studies demonstrate a critical role for autophagy in suppressing silica-induced cytotoxicity and inflammation in disease development. Furthermore, this data highlights the importance of basal autophagy in macrophages and other myeloid cells in maintaining lung homeostasis.
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Affiliation(s)
- Forrest Jessop
- Center for Environmental Health Sciences, University of Montana, Missoula, Montana, United States
| | - Raymond F Hamilton
- Center for Environmental Health Sciences, University of Montana, Missoula, Montana, United States
| | - Joseph F Rhoderick
- Center for Environmental Health Sciences, University of Montana, Missoula, Montana, United States
| | - Pamela K Shaw
- Center for Environmental Health Sciences, University of Montana, Missoula, Montana, United States
| | - Andrij Holian
- Center for Environmental Health Sciences, University of Montana, Missoula, Montana, United States.
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Fei HR, Tian H, Zhou XL, Yang MF, Sun BL, Yang XY, Jiao P, Wang FZ. Inhibition of autophagy enhances effects of PF-04691502 on apoptosis and DNA damage of lung cancer cells. Int J Biochem Cell Biol 2016; 78:52-62. [DOI: 10.1016/j.biocel.2016.06.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Revised: 06/21/2016] [Accepted: 06/30/2016] [Indexed: 10/21/2022]
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Inhibition of autophagy ameliorates pulmonary microvascular dilation and PMVECs excessive proliferation in rat experimental hepatopulmonary syndrome. Sci Rep 2016; 6:30833. [PMID: 27480323 PMCID: PMC4969600 DOI: 10.1038/srep30833] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 07/11/2016] [Indexed: 02/08/2023] Open
Abstract
Hepatopulmonary syndrome (HPS) is a defective liver-induced pulmonary vascular disorder with massive pulmonary microvascular dilation and excessive proliferation of pulmonary microvascular endothelial cells (PMVECs). Growing evidence suggests that autophagy is involved in pulmonary diseases, protectively or detrimentally. Thus, it is interesting and important to explore whether autophagy might be involved in and critical in HPS. In the present study, we report that autophagy was activated in common bile duct ligation (CBDL) rats and cultured pulmonary PMVECs induced by CBDL rat serum, two accepted in vivo and in vitro experimental models of HPS. Furthermore, pharmacological inhibition of autophagy with 3-methyladenine (3-MA) significantly alleviated pathological alterations and typical symptom of HPS in CBDL rats in vivo, and consistently 3-MA significantly attenuated the CBDL rat serum-induced excessive proliferation of PMVECs in vitro. All these changes mediated by 3-MA might explain the observed prominent improvement of pulmonary appearance, edema, microvascular dilatation and arterial oxygenation in vivo. Collectively, these results suggest that autophagy activation may play a critical role in the pathogenesis of HPS, and autophagy inhibition may have a therapeutic potential for this disease.
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Wang Y, Zhang K, Shi X, Wang C, Wang F, Fan J, Shen F, Xu J, Bao W, Liu M, Yu L. Critical role of bacterial isochorismatase in the autophagic process induced by Acinetobacter baumannii in mammalian cells. FASEB J 2016; 30:3563-3577. [PMID: 27432399 PMCID: PMC5024702 DOI: 10.1096/fj.201500019r] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Accepted: 07/05/2016] [Indexed: 12/21/2022]
Abstract
A recent study reported that Acinetobacter baumannii could induce
autophagy, but the recognition and clearance mechanism of intracytosolic A.
baumannii in the autophagic process and the molecular mechanism of
autophagy induced by the pathogen remains unknown. In this study, we first
demonstrated that invading A. baumannii induced a complete,
ubiquitin-mediated autophagic response that is dependent upon septins SEPT2 and SEPT9
in mammalian cells. We also demonstrated that autophagy induced by A.
baumannii was Beclin-1 dependent via the
AMPK/ERK/mammalian target of rapamycin pathway. Of interest, we found that the
isochorismatase mutant strain had significantly decreased siderophore-mediated ferric
iron acquisition ability and had a reduced the ability to induce autophagy. We
verified that isochorismatase was required for the recognition of intracytosolic
A. baumannii mediated by septin cages, ubiquitinated proteins,
and ubiquitin-binding adaptor proteins p62 and NDP52 in autophagic response. We also
confirmed that isochorismatase was required for the clearance of invading A.
baumannii by autophagy in vitro and in the mouse model
of infection. Together, these findings provide insight into the distinctive
recognition and clearance of intracytosolic A. baumannii by
autophagy in host cells, and that isochorismatase plays a critical role in the
A. baumannii–induced autophagic process.—Wang, Y.,
Zhang, K., Shi, X., Wang, C., Wang, F., Fan, J., Shen, F., Xu, J., Bao, W., Liu, M.,
Yu, L. Critical role of bacterial isochorismatase in the autophagic process induced
by Acinetobacter baumannii in mammalian cells.
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Affiliation(s)
- Yang Wang
- Department of Infectious Diseases, First Hospital of Jilin University, Key Laboratory for Zoonosis Research, Institute of Zoonosis, Ministry of Medical Sciences, Changchun, China
| | - Kaiyu Zhang
- Department of Infectious Diseases, First Hospital of Jilin University, Key Laboratory for Zoonosis Research, Institute of Zoonosis, Ministry of Medical Sciences, Changchun, China
| | - Xiaochen Shi
- Department of Infectious Diseases, First Hospital of Jilin University, Key Laboratory for Zoonosis Research, Institute of Zoonosis, Ministry of Medical Sciences, Changchun, China
| | - Chao Wang
- Department of Infectious Diseases, First Hospital of Jilin University, Key Laboratory for Zoonosis Research, Institute of Zoonosis, Ministry of Medical Sciences, Changchun, China
| | - Feng Wang
- Department of Infectious Diseases, First Hospital of Jilin University, Key Laboratory for Zoonosis Research, Institute of Zoonosis, Ministry of Medical Sciences, Changchun, China
| | - Junwen Fan
- Laboratory Animal Center, Academy of Military Medical Sciences, Beijing, China
| | - Fengge Shen
- Department of Infectious Diseases, First Hospital of Jilin University, Key Laboratory for Zoonosis Research, Institute of Zoonosis, Ministry of Medical Sciences, Changchun, China; Jiangsu Co-innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China
| | - Jiancheng Xu
- College of Veterinary Medicine and Animal Science, Jilin University, Changchun, China
| | - Wanguo Bao
- Department of Infectious Diseases, First Hospital of Jilin University, Key Laboratory for Zoonosis Research, Institute of Zoonosis, Ministry of Medical Sciences, Changchun, China
| | - Mingyuan Liu
- Department of Infectious Diseases, First Hospital of Jilin University, Key Laboratory for Zoonosis Research, Institute of Zoonosis, Ministry of Medical Sciences, Changchun, China; Department of Clinical Laboratory, First Hospital of Jilin University, Changchun, China; and
| | - Lu Yu
- Department of Infectious Diseases, First Hospital of Jilin University, Key Laboratory for Zoonosis Research, Institute of Zoonosis, Ministry of Medical Sciences, Changchun, China; Jiangsu Co-innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China
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Lin L, Zhang L, Yu L, Han L, Ji W, Shen H, Hu Z. Time-dependent changes of autophagy and apoptosis in lipopolysaccharide-induced rat acute lung injury. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2016; 19:632-7. [PMID: 27482344 PMCID: PMC4951602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
OBJECTIVES Abnormal lung cell death including autophagy and apoptosis is the central feature in acute lung injury (ALI). To identify the cellular mechanisms and the chronology by which different types of lung cell death are activated during lipopolysaccharide (LPS)-induced ALI, we decided to evaluate autophagy (by LC3-II and autophagosome) and apoptosis (by caspase-3) at different time points after LPS treatment in a rat model of LPS-induced ALI. MATERIALS AND METHODS Sprague-Dawley rats were randomly divided into two groups: control group and LPS group. ALI was induced by LPS intraperitoneal injection (3 mg/kg). The lung tissues were collected to measure lung injury score by histopathological evaluation, the protein expression of LC3-II and caspase-3 by Western blot, and microstructural changes by electron microscopy analysis. RESULTS During ALI, lung cell death exhibited modifications in the death process at different stages of ALI. At early stages (1 hr and 2 hr) of ALI, the mode of lung cell death started with autophagy in LPS group and reached a peak at 2 hr. As ALI process progressed, apoptosis was gradually increased in the lung tissues and reached its maximal level at later stages (6 hr), while autophagy was time-dependently decreased. CONCLUSION These findings suggest that activated autophagy and apoptosis might play distinct roles at different stages of LPS-induced ALI. This information may enhance the understanding of lung pathophysiology at the cellular level during ALI and pulmonary infection, and thus help optimize the timing of innovating therapeutic approaches in future experiments with this model.
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Affiliation(s)
- Li Lin
- School of Basic Medicine, Hubei University of Science and Technology, Xianning 437100, P.R. China,Hubei Province Key Laboratory on Cardiovascular, Cerebrovascular, and Metabolic Disorders, Hubei University of Science and Technology, Xianning 437100, P.R. China
| | - Lijun Zhang
- School of Basic Medicine, Hubei University of Science and Technology, Xianning 437100, P.R. China,Hubei Province Key Laboratory on Cardiovascular, Cerebrovascular, and Metabolic Disorders, Hubei University of Science and Technology, Xianning 437100, P.R. China
| | - Liangzhu Yu
- School of Basic Medicine, Hubei University of Science and Technology, Xianning 437100, P.R. China,Hubei Province Key Laboratory on Cardiovascular, Cerebrovascular, and Metabolic Disorders, Hubei University of Science and Technology, Xianning 437100, P.R. China
| | - Lu Han
- School of Basic Medicine, Hubei University of Science and Technology, Xianning 437100, P.R. China
| | - Wanli Ji
- School of Basic Medicine, Hubei University of Science and Technology, Xianning 437100, P.R. China,Hubei Province Key Laboratory on Cardiovascular, Cerebrovascular, and Metabolic Disorders, Hubei University of Science and Technology, Xianning 437100, P.R. China
| | - Hui Shen
- School of Basic Medicine, Hubei University of Science and Technology, Xianning 437100, P.R. China
| | - Zhenwu Hu
- School of Basic Medicine, Hubei University of Science and Technology, Xianning 437100, P.R. China,Hubei Province Key Laboratory on Cardiovascular, Cerebrovascular, and Metabolic Disorders, Hubei University of Science and Technology, Xianning 437100, P.R. China,Corresponding author: Zhenwu Hu. School of Basic Medicine, Hubei University of Science and Technology, Xianning, Hubei, P.R. China, 437100,
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LI YUEBING, KANG YUQING, WONG KELVINKL, GHISTA DHANJOON, GU MIAONING. INVESTIGATING EXPRESSION OF AUTOPHAGY-ASSOCIATED PROTEINS LEVEL IN RATS WITH ACUTE LUNG INJURY INDUCED BY REMOTE LIMB ISCHEMIA-REPERFUSION. J MECH MED BIOL 2016. [DOI: 10.1142/s0219519416500196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Objective: To explore the early expression of autophagy-associated proteins in lung tissues in acute lung injury (ALI) induced by remote limb ischemia-reperfusion (LIR) by using rats as our test specimens. Method: A total of 48 adult male Sprague-Dawley (SD) rats with weights in the range of 220–250[Formula: see text]g were designated as LIR models, and divided randomly into two groups of 24 each: Sham group and ischemia-reperfusion (I/R) group. Then, each group was divided into four subgroups at the end of 0, 2, 4, 8[Formula: see text]h of reperfusion, after 3[Formula: see text]h of ischemia. The rats were anesthetized by pentobarbital sodium. The serum lactate dehydrogenases (LDH) were detected with enzyme linked immunosorbent assay (ELISA), and the pathological changes of lung tissues were observed by using immunofluorescence techniques. The expression of Beclin1 protein and Atg5 mRNA in the lung tissues were detected by using reverse transcription polymerase chain reaction (RT-PCR), and analyzed by 2[Formula: see text] method; Microtubules associated protein light chain 3 (LC3) in the lung tissues were detected by Western blot test. Result: The levels of serum LDH in I/R groups were much higher than those in Sham groups ([Formula: see text]), which showed that the rats models of LIR were successful. Immunofluorescence examination demonstrated injuries of lung tissues, thickening of alveolar septum and partial consolidation in I/R groups; however, this damage was not observed significantly in Sham groups. The expression of Beclin1 and Atg5 mRNA, LC3-II and the ratio of LC3-II/GAPDH in lung tissues were very much higher at 4 and 8[Formula: see text]h in IR groups ([Formula: see text] or [Formula: see text]), and were significantly higher at the same time compared with Sham groups ([Formula: see text] or [Formula: see text]). Conclusion: LIR causes ALI to induce increased autophagy and high expression of its relevant proteins; while continuous I/R can also cause autophagy inhibition.
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Affiliation(s)
- YUEBING LI
- The Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310005, P. R. China
- Southern Hospital of Southern Medical University, Guangzhou 510515, P. R. China
| | - YUQING KANG
- Southern Hospital of Southern Medical University, Guangzhou 510515, P. R. China
| | - KELVIN KL WONG
- Engineering Computational Biology, School of Computer Science and Software Engineering, The University of Western Australia, 35 Stirling Highway, Crawley WA 6000, Australia
| | - DHANJOO N. GHISTA
- Education Committee, Southern Ozarks Alliance for Rural Development, Willow Springs, MO, USA
| | - MIAONING GU
- Southern Hospital of Southern Medical University, Guangzhou 510515, P. R. China
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Kanayama M, Shinohara ML. Roles of Autophagy and Autophagy-Related Proteins in Antifungal Immunity. Front Immunol 2016; 7:47. [PMID: 26925060 PMCID: PMC4757664 DOI: 10.3389/fimmu.2016.00047] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 01/31/2016] [Indexed: 12/21/2022] Open
Abstract
Autophagy was initially characterized as a process to digest cellular components, including damaged cell organelles or unused proteins. However, later studies showed that autophagy plays an important role to protect hosts from microbial infections. Accumulating evidences showed the contribution of autophagy itself and autophagy-related proteins (ATGs) in the clearance of bacteria, virus, and parasites. A number of studies also revealed the molecular mechanisms by which autophagy is initiated and developed. Furthermore, it is now understood that some ATGs are shared between two distinct processes; autophagy and LC3-associated phagocytosis (LAP). Thus, our understanding on autophagy has been greatly enhanced in the last decade. By contrast, roles of autophagy and ATGs in fungal infections are still elusive relative to those in bacterial and viral infections. Based on limited numbers of reports, ATG-mediated host responses appear to significantly vary depending on invading fungal species. In this review, we discuss how autophagy and ATGs are involved in antifungal immune responses based on recent discoveries.
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Affiliation(s)
- Masashi Kanayama
- Department of Immunology, Duke University School of Medicine , Durham, NC , USA
| | - Mari L Shinohara
- Department of Immunology, Duke University School of Medicine, Durham, NC, USA; Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC, USA
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Nakahira K, Choi AMK. Carbon monoxide in the treatment of sepsis. Am J Physiol Lung Cell Mol Physiol 2015; 309:L1387-93. [PMID: 26498251 DOI: 10.1152/ajplung.00311.2015] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 10/21/2015] [Indexed: 12/31/2022] Open
Abstract
Carbon monoxide (CO), a low-molecular-weight gas, is endogenously produced in the body as a product of heme degradation catalyzed by heme oxygenase (HO) enzymes. As the beneficial roles of HO system have been elucidated in vitro and in vivo, CO itself has also been reported as a potent cytoprotective molecule. Whereas CO represents a toxic inhalation hazard at high concentration, low-dose exogenous CO treatment (~250-500 parts per million) demonstrates protective functions including but not limited to the anti-inflammatory and antiapoptotic effects in preclinical models of human diseases. Of note, CO exposure confers protection in animal models of sepsis by inhibiting inflammatory responses and also enhancing bacterial phagocytosis in leukocytes. These unique functions of CO including both dampening inflammation and promoting host defense mechanism are mediated by multiple pathways such as autophagy induction or biosynthesis of specialized proresolving lipid mediators. We suggest that CO gas may represent a novel therapy for patients with sepsis.
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Affiliation(s)
- Kiichi Nakahira
- Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College and New York-Presbyterian Hospital, New York, New York; and Division of Pulmonary and Crit Care Medicine, Weill Cornell Medical College, New York, New York
| | - Augustine M K Choi
- Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College and New York-Presbyterian Hospital, New York, New York; and Division of Pulmonary and Crit Care Medicine, Weill Cornell Medical College, New York, New York
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35
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Tran I, Ji C, Ni I, Min T, Tang D, Vij N. Role of Cigarette Smoke-Induced Aggresome Formation in Chronic Obstructive Pulmonary Disease-Emphysema Pathogenesis. Am J Respir Cell Mol Biol 2015; 53:159-73. [PMID: 25490051 DOI: 10.1165/rcmb.2014-0107oc] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Cigarette smoke (CS) exposure is known to induce proteostasis imbalance that can initiate accumulation of ubiquitinated proteins. Therefore, the primary goal of this study was to determine if first- and secondhand CS induces localization of ubiquitinated proteins in perinuclear spaces as aggresome bodies. Furthermore, we sought to determine the mechanism by which smoke-induced aggresome formation contributes to chronic obstructive pulmonary disease (COPD)-emphysema pathogenesis. Hence, Beas2b cells were treated with CS extract (CSE) for in vitro experimental analysis of CS-induced aggresome formation by immunoblotting, microscopy, and reporter assays, whereas chronic CS-exposed murine model and human COPD-emphysema lung tissues were used for validation. In preliminary analysis, we observed a significant (P < 0.01) increase in ubiquitinated protein aggregation in the insoluble protein fraction of CSE-treated Beas2b cells. We verified that CS-induced ubiquitin aggregrates are localized in the perinuclear spaces as aggresome bodies. These CS-induced aggresomes (P < 0.001) colocalize with autophagy protein microtubule-associated protein 1 light chain-3B(+) autophagy bodies, whereas U.S. Food and Drug Administration-approved autophagy-inducing drug (carbamazepine) significantly (P < 0.01) decreases their colocalization and expression, suggesting CS-impaired autophagy. Moreover, CSE treatment significantly increases valosin-containing protein-p62 protein-protein interaction (P < 0.0005) and p62 expression (aberrant autophagy marker; P < 0.0001), verifying CS-impaired autophagy as an aggresome formation mechanism. We also found that inhibiting protein synthesis by cycloheximide does not deplete CS-induced ubiquitinated protein aggregates, suggesting the role of CS-induced protein synthesis in aggresome formation. Next, we used an emphysema murine model to verify that chronic CS significantly (P < 0.0005) induces aggresome formation. Moreover, we observed that autophagy induction by carbamazepine inhibits CS-induced aggresome formation and alveolar space enlargement (P < 0.001), confirming involvement of aggresome bodies in COPD-emphysema pathogenesis. Finally, significantly higher p62 accumulation in smokers and severe COPD-emphysema lungs (Global Initiative for Chronic Obstructive Lung Disease Stage III/IV) as compared with normal nonsmokers (Global Initiative for Chronic Obstructive Lung Disease Stage 0) substantiates the pathogenic role of autophagy impairment in aggresome formation and COPD-emphysema progression. In conclusion, CS-induced aggresome formation is a novel mechanism involved in COPD-emphysema pathogenesis.
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Affiliation(s)
- Ian Tran
- Departments of 1 Pediatric Respiratory Science and.,2 Biomedical Engineering, the Johns Hopkins University School of Medicine, Baltimore, Maryland; and
| | - Changhoon Ji
- Departments of 1 Pediatric Respiratory Science and.,2 Biomedical Engineering, the Johns Hopkins University School of Medicine, Baltimore, Maryland; and
| | - Inzer Ni
- Departments of 1 Pediatric Respiratory Science and.,2 Biomedical Engineering, the Johns Hopkins University School of Medicine, Baltimore, Maryland; and
| | - Taehong Min
- Departments of 1 Pediatric Respiratory Science and.,2 Biomedical Engineering, the Johns Hopkins University School of Medicine, Baltimore, Maryland; and
| | - Danni Tang
- Departments of 1 Pediatric Respiratory Science and.,2 Biomedical Engineering, the Johns Hopkins University School of Medicine, Baltimore, Maryland; and
| | - Neeraj Vij
- Departments of 1 Pediatric Respiratory Science and.,3 College of Medicine, Central Michigan University, Mount Pleasant, Michigan
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36
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Furlong HC, Stämpfli MR, Gannon AM, Foster WG. Cigarette smoke exposure triggers the autophagic cascade via activation of the AMPK pathway in mice. Biol Reprod 2015; 93:93. [PMID: 26377221 PMCID: PMC4711909 DOI: 10.1095/biolreprod.115.132183] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 07/05/2015] [Accepted: 09/03/2015] [Indexed: 01/22/2023] Open
Abstract
We previously demonstrated that cigarette smoke (CS) exposure decreases primordial follicle counts and induces autophagy in ovarian granulosa cells in preference to apoptosis. Therefore, the objective of this study was to investigate molecular targets underlying smoke-induced activation of the reparative autophagy pathway in the ovary. Briefly, ovarian homogenates were prepared from adult female mice exposed to mainstream CS twice daily for 8 wk, using a whole-body exposure system. A gene array revealed that CS exposure induced a greater than 2-fold significant increase in the expression of proautophagic genes Cdkn1b, Map1lc3a, Bad, and Sqstm1/p62. A significant increase in Prkaa2, Pik3c3, and Maplc31b expression, as well as a significant decrease in Akt1 and Mtor expression, was detected by quantitative PCR. The 5'-AMP-activated protein kinase catalytic subunit (AMPK) alpha1 + alpha2 and ATG7 protein expression was significantly increased, whereas AKT1, mTOR, CDKN1B/p27, and CXCR4 proteins were significantly decreased in CS exposed versus control ovaries. Up-regulation of AMPK alpha1 + alpha2, a known initiator of autophagic signaling, and ATG7 further suggests activation of the autophagy cascade. Two prosurvival factors, AKT and mTOR, were decreased in expression, an outcome that favors induction of the autophagy pathway, whereas decreased levels of CDKN1B is suggestive of cell cycle dysregulation. In summary, our data suggest that CS exposure induces ovarian follicle loss through induction of the autophagic cascade via the AMPK pathway together with inhibition of antiautophagic markers AKT and mTOR. We further postulate that toxicant-induced dysregulation of reparative autophagy is a novel pathway central to impaired follicle development and subfertility.
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Affiliation(s)
- Hayley C Furlong
- Department of Obstetrics and Gynecology, McMaster University, Hamilton, Ontario, Canada
| | - Martin R Stämpfli
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Anne M Gannon
- Department of Obstetrics and Gynecology, McMaster University, Hamilton, Ontario, Canada
| | - Warren G Foster
- Department of Obstetrics and Gynecology, McMaster University, Hamilton, Ontario, Canada
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Gregory DJ, Kobzik L. Influenza lung injury: mechanisms and therapeutic opportunities. Am J Physiol Lung Cell Mol Physiol 2015; 309:L1041-6. [PMID: 26408556 DOI: 10.1152/ajplung.00283.2015] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 09/16/2015] [Indexed: 12/22/2022] Open
Abstract
In this Perspectives, we discuss some recent developments in the pathogenesis of acute lung injury following influenza infection, with an emphasis on promising therapeutic leads. Damage to the alveolar-capillary barrier has been quantified in mice, and agents have been identified that can help to preserve barrier integrity, such as vasculotide, angiopoietin-like 4 neutralization, and sphingosine 1-phosphate mimics. Results from studies using mesenchymal stem cells have been disappointing, despite promising data in other types of lung injury. The roles of fatty acid binding protein 5, prostaglandin E2, and the interplay between IFN-γ and STAT1 in epithelial signaling during infection have been addressed in vitro. Finally, we discuss the role of autophagy in inflammatory cytokine production and the viral life cycle and the opportunities this presents for intervention.
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Affiliation(s)
- David J Gregory
- Molecular and Integrative Physiological Sciences Program, Department of Environmental Health, Harvard T. H. Chan School of Public Health
| | - Lester Kobzik
- Molecular and Integrative Physiological Sciences Program, Department of Environmental Health, Harvard T. H. Chan School of Public Health
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38
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Mulugeta S, Nureki SI, Beers MF. Lost after translation: insights from pulmonary surfactant for understanding the role of alveolar epithelial dysfunction and cellular quality control in fibrotic lung disease. Am J Physiol Lung Cell Mol Physiol 2015; 309:L507-25. [PMID: 26186947 PMCID: PMC4572416 DOI: 10.1152/ajplung.00139.2015] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 07/10/2015] [Indexed: 01/08/2023] Open
Abstract
Dating back nearly 35 years ago to the Witschi hypothesis, epithelial cell dysfunction and abnormal wound healing have reemerged as central concepts in the pathophysiology of idiopathic pulmonary fibrosis (IPF) in adults and in interstitial lung disease in children. Alveolar type 2 (AT2) cells represent a metabolically active compartment in the distal air spaces responsible for pulmonary surfactant biosynthesis and function as a progenitor population required for maintenance of alveolar integrity. Rare mutations in surfactant system components have provided new clues to understanding broader questions regarding the role of AT2 cell dysfunction in the pathophysiology of fibrotic lung diseases. Drawing on data generated from a variety of model systems expressing disease-related surfactant component mutations [surfactant proteins A and C (SP-A and SP-C); the lipid transporter ABCA3], this review will examine the concept of epithelial dysfunction in fibrotic lung disease, provide an update on AT2 cell and surfactant biology, summarize cellular responses to mutant surfactant components [including endoplasmic reticulum (ER) stress, mitochondrial dysfunction, and intrinsic apoptosis], and examine quality control pathways (unfolded protein response, the ubiquitin-proteasome system, macroautophagy) that can be utilized to restore AT2 homeostasis. This integrated response and its derangement will be placed in the context of cell stress and quality control signatures found in patients with familial or sporadic IPF as well as non-surfactant-related AT2 cell dysfunction syndromes associated with a fibrotic lung phenotype. Finally, the need for targeted therapeutic strategies for pulmonary fibrosis that address epithelial ER stress, its downstream signaling, and cell quality control are discussed.
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Affiliation(s)
- Surafel Mulugeta
- Pulmonary, Allergy, and Critical Care Division; Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania; and
| | - Shin-Ichi Nureki
- Department of Respiratory Medicine and Infectious Diseases, Oita University, Yufu, Oita, Japan
| | - Michael F Beers
- Pulmonary, Allergy, and Critical Care Division; Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania; and
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Margaritopoulos GA, Vasarmidi E, Jacob J, Wells AU, Antoniou KM. Smoking and interstitial lung diseases. Eur Respir Rev 2015; 24:428-35. [PMID: 26324804 PMCID: PMC9487692 DOI: 10.1183/16000617.0050-2015] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
For many years has been well known that smoking could cause lung damage. Chronic obstructive pulmonary disease and lung cancer have been the two most common smoking-related lung diseases. In the recent years, attention has also focused on the role of smoking in the development of interstitial lung diseases (ILDs). Indeed, there are three diseases, namely respiratory bronchiolitis-associated ILD, desquamative interstitial pneumonia and pulmonary Langerhans cell histiocytosis, that are currently considered aetiologically linked to smoking and a few others which are more likely to develop in smokers. Here, we aim to focus on the most recent findings regarding the role of smoking in the pathogenesis and clinical behaviour of ILDs. Smoking is implicated in the pathogenesis and clinical behaviour of interstitial lung diseasehttp://ow.ly/PYLcT
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40
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Interactions between Autophagy and Bacterial Toxins: Targets for Therapy? Toxins (Basel) 2015; 7:2918-58. [PMID: 26248079 PMCID: PMC4549733 DOI: 10.3390/toxins7082918] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 07/27/2015] [Accepted: 07/28/2015] [Indexed: 01/07/2023] Open
Abstract
Autophagy is a physiological process involved in defense mechanisms for clearing intracellular bacteria. The autophagic pathway is finely regulated and bacterial toxins interact with this process in a complex manner. Bacterial toxins also interact significantly with many biochemical processes. Evaluations of the effects of bacterial toxins, such as endotoxins, pore-forming toxins and adenylate cyclases, on autophagy could support the development of new strategies for counteracting bacterial pathogenicity. Treatment strategies could focus on drugs that enhance autophagic processes to improve the clearance of intracellular bacteria. However, further in vivo studies are required to decipher the upregulation of autophagy and potential side effects limiting such approaches. The capacity of autophagy activation strategies to improve the outcome of antibiotic treatment should be investigated in the future.
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41
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Surolia R, Karki S, Kim H, Yu Z, Kulkarni T, Mirov SB, Carter AB, Rowe SM, Matalon S, Thannickal VJ, Agarwal A, Antony VB. Heme oxygenase-1-mediated autophagy protects against pulmonary endothelial cell death and development of emphysema in cadmium-treated mice. Am J Physiol Lung Cell Mol Physiol 2015; 309:L280-92. [PMID: 26071551 DOI: 10.1152/ajplung.00097.2015] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 06/02/2015] [Indexed: 12/27/2022] Open
Abstract
Pulmonary exposure to cadmium, a major component of cigarette smoke, has a dramatic impact on lung function and the development of emphysema. Cigarette smoke exposure induces heme oxygenase-1 (HO-1), a cytoprotective enzyme. In this study, we employed a truncated mouse model of emphysema by intratracheal instillation of cadmium (CdCl2) solution (0.025% per 1 mg/kg body wt) in HO-1(+/+), HO-1(-/-), and overexpressing humanized HO-1 bacterial artificial chromosome (hHO-1BAC) mice. We evaluated the role of HO-1 in cadmium-induced emphysema in mice by analyzing histopathology, micro-computed tomography scans, and lung function tests. CdCl2-exposed HO-1(-/-) mice exhibited more severe emphysema compared with HO-1(+/+) or hHO-1BAC mice. Loss of pulmonary endothelial cells (PECs) from the alveolar capillary membrane is recognized to be a target in emphysema. PECs from HO-1(+/+), HO-1(-/-), and hHO-1BAC were employed to define the underlying molecular mechanism for the protection from emphysema by HO-1. Electron microscopy, expression of autophagic markers (microtubule-associated protein 1B-light chain 3 II, autophagy protein 5, and Beclin1) and apoptotic marker (cleaved caspase 3) suggested induction of autophagy and apoptosis in PECs after CdCl2 treatment. CdCl2-treated HO-1(-/-) PECs exhibited downregulation of autophagic markers and significantly increased cleaved caspase 3 expression and activity (∼4-fold higher). Moreover, hHO-1BAC PECs demonstrated upregulated autophagy and absence of cleaved caspase 3 expression or activity. Pretreatment of HO-1(+/+) PECs with rapamycin induced autophagy and resulted in reduced cell death upon cadmium treatment. Induction of autophagy following CdCl2 treatment was found to be protective from apoptotic cell death. HO-1 induced protective autophagy in PECs and mitigated cadmium-induced emphysema.
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Affiliation(s)
- Ranu Surolia
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Alabama at Birmingham, Alabama
| | - Suman Karki
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Alabama at Birmingham, Alabama
| | - Hyunki Kim
- Department of Radiology, University of Alabama at Birmingham, Alabama
| | - Zhihong Yu
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Alabama
| | - Tejaswini Kulkarni
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Alabama at Birmingham, Alabama
| | - Sergey B Mirov
- Department of Physics, University of Alabama at Birmingham, Alabama
| | - A Brent Carter
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Alabama at Birmingham, Alabama; Veterans Affairs Medical Center, University of Alabama at Birmingham, Alabama
| | - Steven M Rowe
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Alabama at Birmingham, Alabama; Department of Pediatrics, University of Alabama at Birmingham, Alabama; Department of Cell Development and Integrative Biology, University of Alabama at Birmingham, Alabama
| | - Sadis Matalon
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Alabama
| | - Victor J Thannickal
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Alabama at Birmingham, Alabama
| | - Anupam Agarwal
- Division of Nephrology Department of Medicine, University of Alabama at Birmingham, Alabama; Veterans Affairs Medical Center, University of Alabama at Birmingham, Alabama
| | - Veena B Antony
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, University of Alabama at Birmingham, Alabama;
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42
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Whitsett JA, Alenghat T. Respiratory epithelial cells orchestrate pulmonary innate immunity. Nat Immunol 2015; 16:27-35. [PMID: 25521682 PMCID: PMC4318521 DOI: 10.1038/ni.3045] [Citation(s) in RCA: 478] [Impact Index Per Article: 53.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Accepted: 10/30/2014] [Indexed: 02/07/2023]
Abstract
The epithelial surfaces of the lungs are in direct contact with the environment and are subjected to dynamic physical forces as airway tubes and alveoli are stretched and compressed during ventilation. Mucociliary clearance in conducting airways, reduction of surface tension in the alveoli, and maintenance of near sterility have been accommodated by the evolution of a multi-tiered innate host-defense system. The biophysical nature of pulmonary host defenses are integrated with the ability of respiratory epithelial cells to respond to and 'instruct' the professional immune system to protect the lungs from infection and injury.
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Affiliation(s)
- Jeffrey A Whitsett
- Perinatal Institute, Division of Neonatology, Division of Perinatal Biology and Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Theresa Alenghat
- Division of Immunobiology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
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43
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Matalon S. A critical review of the American Journal of Physiology-Lung Cellular and Molecular Physiology: 2012-2015. Am J Physiol Lung Cell Mol Physiol 2014; 307:L911-6. [PMID: 25381028 DOI: 10.1152/ajplung.00330.2014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
I have had the privilege of serving as Editor-in-Chief of the American Journal of Physiology: Lung Cellular and Molecular Physiology from 1/1/2012 to 1/1/2015 and have been reappointed for another 3-year term. When I took over as editor, I published an editorial in AJP-Lung in which I highlighted my vision and outlined the tasks to be accomplished to transform AJP-Lung into "The best place to publish basic, translational, and hypothesis-driven clinical lung research." Herein I review our accomplishments during the first term. As promised, we review each article submitted to this journal and our reviews always help the quality and impact of every paper. We recognized the contributions of junior authors by establishing a number of awards and increased the visibility of AJP-Lung by establishing Facebook and Blog electronic pages and sponsoring symposia in scientific meetings. Our impact factor increased from 3.523 in 2011 to 4.041 in 2012 and, thanks to our calls for papers, we are receiving large numbers of high-quality papers in all aspects of pulmonary cell biology and lung diseases. The best is yet to come.
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Affiliation(s)
- Sadis Matalon
- Department of Anesthesiology and Pulmonary Injury and Repair Center, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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44
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Quinton LJ, Mizgerd JP. Dynamics of lung defense in pneumonia: resistance, resilience, and remodeling. Annu Rev Physiol 2014; 77:407-30. [PMID: 25148693 DOI: 10.1146/annurev-physiol-021014-071937] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Pneumonia is initiated by microbes in the lung, but physiological processes integrating responses across diverse cell types and organ systems dictate the outcome of respiratory infection. Resistance, or actions of the host to eradicate living microbes, in the lungs involves a combination of innate and adaptive immune responses triggered by air-space infection. Resilience, or the ability of the host tissues to withstand the physiologically damaging effects of microbial and immune activities, is equally complex, precisely regulated, and determinative. Both immune resistance and tissue resilience are dynamic and change throughout the lifetime, but we are only beginning to understand such remodeling and how it contributes to the incidence of severe pneumonias, which diminishes as childhood progresses and then increases again among the elderly. Here, we review the concepts of resistance, resilience, and remodeling as they apply to pneumonia, highlighting recent advances and current significant knowledge gaps.
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45
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Chen ZH, Cao JF, Zhou JS, Liu H, Che LQ, Mizumura K, Li W, Choi AMK, Shen HH. Interaction of caveolin-1 with ATG12-ATG5 system suppresses autophagy in lung epithelial cells. Am J Physiol Lung Cell Mol Physiol 2014; 306:L1016-25. [PMID: 24727585 DOI: 10.1152/ajplung.00268.2013] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Autophagy plays a pivotal role in cellular homeostasis and adaptation to adverse environments, although the regulation of this process remains incompletely understood. We have recently observed that caveolin-1 (Cav-1), a major constituent of lipid rafts on plasma membrane, can regulate autophagy in cigarette smoking-induced injury of lung epithelium, although the underlying molecular mechanisms remain incompletely understood. In the present study we found that Cav-1 interacted with and regulated the expression of ATG12-ATG5, an ubiquitin-like conjugation system crucial for autophagosome formation, in lung epithelial Beas-2B cells. Deletion of Cav-1 increased basal and starvation-induced levels of ATG12-ATG5 and autophagy. Biochemical analyses revealed that Cav-1 interacted with ATG5, ATG12, and their active complex ATG12-ATG5. Overexpression of ATG5 or ATG12 increased their interactions with Cav-1, the formation of ATG12-ATG5 conjugate, and the subsequent basal levels of autophagy but resulted in decreased interactions between Cav-1 and another molecule. Knockdown of ATG12 enhanced the ATG5-Cav-1 interaction. Mutation of the Cav-1 binding motif on ATG12 disrupted their interaction and further augmented autophagy. Cav-1 also regulated the expression of ATG16L, another autophagy protein associating with the ATG12-ATG5 conjugate during autophagosome formation. Altogether these studies clearly demonstrate that Cav-1 competitively interacts with the ATG12-ATG5 system to suppress the formation and function of the latter in lung epithelial cells, thereby providing new insights into the molecular mechanisms by which Cav-1 regulates autophagy and suggesting the important function of Cav-1 in certain lung diseases via regulation of autophagy homeostasis.
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Affiliation(s)
- Zhi-Hua Chen
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | | | - Jie-Sen Zhou
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Hui Liu
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Luan-Qing Che
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Kenji Mizumura
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts; and
| | - Wen Li
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Augustine M K Choi
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts; and
| | - Hua-Hao Shen
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China; State Key Laboratory of Respiratory Diseases, Guangzhou, China
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46
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Malaviya R, Laskin JD, Laskin DL. Oxidative stress-induced autophagy: role in pulmonary toxicity. Toxicol Appl Pharmacol 2014; 275:145-51. [PMID: 24398106 DOI: 10.1016/j.taap.2013.12.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Accepted: 12/28/2013] [Indexed: 02/06/2023]
Abstract
Autophagy is an evolutionarily conserved catabolic process important in regulating the turnover of essential proteins and in elimination of damaged organelles and protein aggregates. Autophagy is observed in the lung in response to oxidative stress generated as a consequence of exposure to environmental toxicants. Whether autophagy plays role in promoting cell survival or cytotoxicity is unclear. In this article recent findings on oxidative stress-induced autophagy in the lung are reviewed; potential mechanisms initiating autophagy are also discussed. A better understanding of autophagy and its role in pulmonary toxicity may lead to the development of new strategies to treat lung injury associated with oxidative stress.
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Affiliation(s)
- Rama Malaviya
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, NJ 08854, USA
| | - Jeffrey D Laskin
- Department of Environmental and Occupational Medicine, Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ 08854, USA
| | - Debra L Laskin
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, NJ 08854, USA.
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47
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Pan H, Zhang Y, Luo Z, Li P, Liu L, Wang C, Wang H, Li H, Ma Y. Autophagy mediates avian influenza H5N1 pseudotyped particle-induced lung inflammation through NF-κB and p38 MAPK signaling pathways. Am J Physiol Lung Cell Mol Physiol 2013; 306:L183-95. [PMID: 24242010 DOI: 10.1152/ajplung.00147.2013] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Since avian influenza virus H5N1-induced hypercytokemia plays a key role in acute lung injury, understanding its molecular mechanism is highly desirable for discovering therapeutic targets against H5N1 infection. In the present study, we investigated the role of autophagy in H5N1-induced lung inflammation by using H5N1 pseudotyped viral particles (H5N1pps). The results showed that H5N1pps significantly induced autophagy both in A549 human lung epithelial cells and in mouse lung tissues, which was primarily due to hemagglutinin (HA) of H5N1 virus. Blocking autophagy with 3-methyladenine (an autophagy inhibitor) or siRNA knockdown of autophagy-related genes (beclin1 and atg5) dramatically attenuated H5N1pp-induced proinflammatory cytokines and chemokines, such as IL-1β, TNF-α, IL-6, CCL2, and CCL5, both in vitro and in vivo. Autophagy-mediated inflammatory responses involved the activation of NF-κB and p38 MAPK signaling pathways, which required the presence of clathrin but did not rely on p62 or autophagosome-lysosome fusion. On the other hand, the activation of NF-κB also promoted H5N1pp-induced autophagosome formation. These data indicated a positive feedback loop between autophagy and NF-κB signaling cascade, which could exacerbate H5N1pp-induced lung inflammation. Our data demonstrated an essential role of autophagy in H5N1pp-triggered inflammatory responses, and targeting the autophagic pathway could be a promising strategy to treat H5N1 virus-caused lung inflammation.
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Affiliation(s)
- Hong Pan
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Science, 1068 Xueyuan Ave., Shenzhen Univ. Town, Shenzhen, P. R. China 518055.
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