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Guan Y, Spaulding H, Yu Q, Zhang M, Willoughby O, Drake JC, Yan Z. Ulk1 phosphorylation at S555 is not required for endurance training-induced improvements in exercise and metabolic capacity in mice. J Appl Physiol (1985) 2024; 137:223-232. [PMID: 38900860 PMCID: PMC11340693 DOI: 10.1152/japplphysiol.00742.2023] [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: 10/18/2023] [Revised: 06/07/2024] [Accepted: 06/10/2024] [Indexed: 06/22/2024] Open
Abstract
Endurance exercise training improves exercise capacity as well as skeletal muscle and whole body metabolism, which are hallmarks of high quality-of-life and healthy aging. However, its mechanisms are not yet fully understood. Exercise-induced mitophagy has emerged as an important step in mitochondrial remodeling. Unc-51-like autophagy-activating kinase 1, ULK1, specifically its activation by phosphorylation at serine 555, was discovered as an autophagy driver and to be important for energetic stress-induced mitophagy in skeletal muscle, making it a potential mediator of the beneficial effects of exercise on mitochondrial remodeling. Here, we used CRISPR/Cas9-mediated gene editing and generated knock-in mice with a serine-to-alanine mutation of Ulk1 on serine 555. We now report that these mice displayed normal endurance capacity and cardiac function at baseline with a mild impairment in energy metabolism as indicated by an accelerated increase of respiratory exchange ratio (RER) during acute exercise stress; however, this was completely corrected by 8 wk of voluntary running. Ulk1-S555A mice also retained the exercise-mediated improvements in exercise capacity and metabolic flux. We conclude that Ulk1 phosphorylation at S555 is not required for exercise-mediated improvements of exercise and metabolic capacity in healthy mice.NEW & NOTEWORTHY We have used CRISPR/Cas9-mediated gene editing to generate Ulk1-S555A knock-in mice to show that loss of phosphorylation of Ulk1 at S555 blunted exercise-induced mitophagy and mildly impairs energy metabolism during exercise in healthy mice. However, the knock-in mice retained exercise training-mediated improvements of endurance capacity and energy metabolism during exercise. These findings suggest that exercise-induced mitophagy through Ulk1 activation is not required for the metabolic adaptation and improved exercise capacity in young, healthy mice.
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Affiliation(s)
- Yuntian Guan
- Fralin Biomedical Research Institute, Center for Exercise Medicine Research at Virginia Tech Carilion, Roanoke, Virginia, United States
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, School of Medicine, University of Virginia, Charlottesville, Virginia, United States
- Department of Pharmacology, School of Medicine,University of Virginia, Charlottesville, Virginia, United States
| | - Hannah Spaulding
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, School of Medicine, University of Virginia, Charlottesville, Virginia, United States
| | - Qing Yu
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, School of Medicine, University of Virginia, Charlottesville, Virginia, United States
| | - Mei Zhang
- Fralin Biomedical Research Institute, Center for Exercise Medicine Research at Virginia Tech Carilion, Roanoke, Virginia, United States
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, School of Medicine, University of Virginia, Charlottesville, Virginia, United States
- Department of Pharmacology, School of Medicine,University of Virginia, Charlottesville, Virginia, United States
| | - Orion Willoughby
- Department of Human Nutrition, Foods, and Exercise, College of Agriculture and Life Sciences, Virginia Tech, Blacksburg, Virginia, United States
| | - Joshua C Drake
- Department of Human Nutrition, Foods, and Exercise, College of Agriculture and Life Sciences, Virginia Tech, Blacksburg, Virginia, United States
| | - Zhen Yan
- Fralin Biomedical Research Institute, Center for Exercise Medicine Research at Virginia Tech Carilion, Roanoke, Virginia, United States
- Department of Human Nutrition, Foods, and Exercise, College of Agriculture and Life Sciences, Virginia Tech, Blacksburg, Virginia, United States
- Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, School of Medicine, University of Virginia, Charlottesville, Virginia, United States
- Department of Pharmacology, School of Medicine,University of Virginia, Charlottesville, Virginia, United States
- Molecular Physiology and Biological Physics, School of Medicine,University of Virginia, Charlottesville, Virginia, United States
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2
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Zannikou M, Fish EN, Platanias LC. Signaling by Type I Interferons in Immune Cells: Disease Consequences. Cancers (Basel) 2024; 16:1600. [PMID: 38672681 PMCID: PMC11049350 DOI: 10.3390/cancers16081600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 04/08/2024] [Accepted: 04/18/2024] [Indexed: 04/28/2024] Open
Abstract
This review addresses interferon (IFN) signaling in immune cells and the tumor microenvironment (TME) and examines how this affects cancer progression. The data reveal that IFNs exert dual roles in cancers, dependent on the TME, exhibiting both anti-tumor activity and promoting cancer progression. We discuss the abnormal IFN signaling induced by cancerous cells that alters immune responses to permit their survival and proliferation.
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Affiliation(s)
- Markella Zannikou
- Robert H. Lurie Comprehensive Cancer Center, Division of Hematology-Oncology, Feinberg School of Medicine, Northwestern University, 303 East Superior Ave., Chicago, IL 60611, USA
| | - Eleanor N. Fish
- Toronto General Hospital Research Institute, University Health Network, 67 College Street, Toronto, ON M5G 2M1, Canada;
- Department of Immunology, University of Toronto, 1 King’s College Circle, Toronto, ON M5S 1A8, Canada
| | - Leonidas C. Platanias
- Robert H. Lurie Comprehensive Cancer Center, Division of Hematology-Oncology, Feinberg School of Medicine, Northwestern University, 303 East Superior Ave., Chicago, IL 60611, USA
- Department of Medicine, Jesse Brown Veterans Affairs Medical Center, 820 S. Damen Ave., Chicago, IL 60612, USA
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3
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Sun D, Zhang Z, Yu X, Li H, Wang X, Chen L. The mechanism of UNC-51-like kinase 1 and the applications of small molecule modulators in cancer treatment. Eur J Med Chem 2024; 268:116273. [PMID: 38432059 DOI: 10.1016/j.ejmech.2024.116273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/19/2024] [Accepted: 02/19/2024] [Indexed: 03/05/2024]
Abstract
Autophagy is a process of self-renewal in cells, which not only provides the necessary nutrients for cells, but also clears necrotic organelles. Autophagy disorders are closely related to diseases such as cancer. UNC-51-like kinase 1 (ULK1) is a serine/threonine protein kinase that plays a crucial role in receiving input from energy and nutrient sensors, activating autophagy to maintain cellular homeostasis under stressful conditions. In recent years, targeting ULK1 has become a highly promising strategy for cancer treatment. This review introduces the regulatory mechanism of ULK1 in autophagy through the AMPK/mTOR/ULK1 pathway and reviews the research progress of ULK1 activators and inhibitors and their applications in cancer treatment. In addition, we analyze the binding modes between ULK1 and modulators through virtual molecular docking, which will provide a reliable basis and theoretical guidance for the design and development of new therapeutic drugs targeting ULK1.
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Affiliation(s)
- Dejuan Sun
- Wuya College of Innovation, Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang, 110016, China; Chinese People's Liberation Army Logistics Support Force, No. 967 Hospital, Dalian, 116021, China
| | - Zhiqi Zhang
- Wuya College of Innovation, Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang, 110016, China
| | - Xinbo Yu
- Wuya College of Innovation, Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang, 110016, China
| | - Hua Li
- Wuya College of Innovation, Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang, 110016, China; Institute of Structural Pharmacology & TCM Chemical Biology, Fujian Key Laboratory of Chinese Materia Medica, College of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou, 350122, China.
| | - Xiaobo Wang
- Chinese People's Liberation Army Logistics Support Force, No. 967 Hospital, Dalian, 116021, China.
| | - Lixia Chen
- Wuya College of Innovation, Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang, 110016, China.
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4
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Sasaki T, Kushida Y, Norizuki T, Kosako H, Sato K, Sato M. ALLO-1- and IKKE-1-dependent positive feedback mechanism promotes the initiation of paternal mitochondrial autophagy. Nat Commun 2024; 15:1460. [PMID: 38368448 PMCID: PMC10874384 DOI: 10.1038/s41467-024-45863-2] [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: 07/19/2023] [Accepted: 02/06/2024] [Indexed: 02/19/2024] Open
Abstract
Allophagy is responsible for the selective removal of paternally inherited organelles, including mitochondria, in Caenorhabditis elegans embryos, thereby facilitating the maternal inheritance of mitochondrial DNA. We previously identified two key factors in allophagy: an autophagy adaptor allophagy-1 (ALLO-1) and TBK1/IKKε family kinase IKKE-1. However, the precise mechanisms by which ALLO-1 and IKKE-1 regulate local autophagosome formation remain unclear. In this study, we identify two ALLO-1 isoforms with different substrate preferences during allophagy. Live imaging reveals a stepwise mechanism of ALLO-1 localization with rapid cargo recognition, followed by ALLO-1 accumulation around the cargo. In the ikke-1 mutant, the accumulation of ALLO-1, and not the recognition of cargo, is impaired, resulting in the failure of isolation membrane formation. Our results also suggest a feedback mechanism for ALLO-1 accumulation via EPG-7/ATG-11, a worm homolog of FIP200, which is a candidate for IKKE-1-dependent phosphorylation. This feedback mechanism may underlie the ALLO-1-dependent initiation and progression of autophagosome formation around paternal organelles.
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Affiliation(s)
- Taeko Sasaki
- Laboratory of Molecular Membrane Biology, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma, 371-8512, Japan
- Laboratory of Molecular Traffic, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma, 371-8512, Japan
| | - Yasuharu Kushida
- Laboratory of Molecular Traffic, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma, 371-8512, Japan
| | - Takuya Norizuki
- Laboratory of Molecular Membrane Biology, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma, 371-8512, Japan
| | - Hidetaka Kosako
- Division of Cell Signaling, Fujii Memorial Institute of Medical Sciences, Institute of Advanced Medical Sciences, Tokushima University, Tokushima, 770-8503, Japan
| | - Ken Sato
- Laboratory of Molecular Traffic, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma, 371-8512, Japan.
| | - Miyuki Sato
- Laboratory of Molecular Membrane Biology, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma, 371-8512, Japan.
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5
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Lu Y, Xu J, Li Y, Wang R, Dai C, Zhang B, Zhang X, Xu L, Tao Y, Han M, Guo R, Wu Q, Wu L, Meng Z, Tan M, Li J. DRAK2 suppresses autophagy by phosphorylating ULK1 at Ser 56 to diminish pancreatic β cell function upon overnutrition. Sci Transl Med 2024; 16:eade8647. [PMID: 38324636 DOI: 10.1126/scitranslmed.ade8647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 01/12/2024] [Indexed: 02/09/2024]
Abstract
Impeded autophagy can impair pancreatic β cell function by causing apoptosis, of which DAP-related apoptosis-inducing kinase-2 (DRAK2) is a critical regulator. Here, we identified a marked up-regulation of DRAK2 in pancreatic tissue across humans, macaques, and mice with type 2 diabetes (T2D). Further studies in mice showed that conditional knockout (cKO) of DRAK2 in pancreatic β cells protected β cell function against high-fat diet feeding along with sustained autophagy and mitochondrial function. Phosphoproteome analysis in isolated mouse primary islets revealed that DRAK2 directly phosphorylated unc-51-like autophagy activating kinase 1 (ULK1) at Ser56, which was subsequently found to induce ULK1 ubiquitylation and suppress autophagy. ULK1-S56A mutation or pharmacological inhibition of DRAK2 preserved mitochondrial function and insulin secretion against lipotoxicity in mouse primary islets, Min6 cells, or INS-1E cells. In conclusion, these findings together indicate an indispensable role of the DRAK2-ULK1 axis in pancreatic β cells upon metabolic challenge, which offers a potential target to protect β cell function in T2D.
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Affiliation(s)
- Yuting Lu
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
| | - Junyu Xu
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
- Zhongshan Institute for Drug Discovery, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Zhongshan, Guangdong 528400, P. R. China
| | - Yufeng Li
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
| | - Ruoran Wang
- Department of Pathology and Pathophysiology and Department of Cardiology of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P. R. China
- School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, P. R. China
| | - Chengqiu Dai
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
- School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Bingqian Zhang
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Xinwen Zhang
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
| | - Lei Xu
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
- Zhongshan Institute for Drug Discovery, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Zhongshan, Guangdong 528400, P. R. China
| | - Yunhua Tao
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
| | - Ming Han
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
| | - Ren Guo
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
| | - Qingqian Wu
- Department of Pathology and Pathophysiology and Department of Cardiology of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P. R. China
| | - Linshi Wu
- Shanghai Jiaotong University, School of Medicine, Renji Hospital, Shanghai, 201112, P. R. China
| | - Zhuoxian Meng
- Department of Pathology and Pathophysiology and Department of Cardiology of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P. R. China
- Key Laboratory of Disease Proteomics of Zhejiang Province, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P. R. China
| | - Minjia Tan
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
- Zhongshan Institute for Drug Discovery, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Zhongshan, Guangdong 528400, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jingya Li
- State Key Laboratory of Drug Research, the National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences. Shanghai, 201203, P. R. China
- School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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6
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Wang D, Yang F, Han G, Zhang J, Wang H, Xiao Z, Chen W, Li P. Identification of a 5-Gene Cuproptosis Signature Predicting the Prognosis for Colon Adenocarcinoma Based on WGCNA. Technol Cancer Res Treat 2024; 23:15330338241250285. [PMID: 38802999 PMCID: PMC11135095 DOI: 10.1177/15330338241250285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 03/11/2024] [Accepted: 04/08/2024] [Indexed: 05/29/2024] Open
Abstract
Background: Colorectal cancer is a highly aggressive malignant tumor that primarily affects the digestive system. It is frequently diagnosed at an advanced stage. Cuproptosis is a copper-dependent form cell death mechanism, distinct from all other known pathways underlying cell death, tumor progression, prognosis, and immune response. Although the role of cuproptosis in colorectal cancer has been investigated over time, there is still an urgent need to explore new methods and insights to understand its potential function. Methods: The Gene Expression Omnibus and The Cancer Genome Atlas gene expression data were systematically explored to investigate the role of cuproptosis in colon adenocarcinoma. The weighted gene coexpression network analysis was used to construct a gene coexpression network and identify the critical module and cuproptosis-related genes correlated with colon adenocarcinoma prognosis. A cuproptosis-related genes prognostic signature for colon adenocarcinoma was identified and validated. To validate the identified gene signature, quantitative reverse transcription-polymerase chain reaction was performed. Cell proliferation assays were analyzed by CCK8 and cell cycle detection. In addition, reactive oxygen species assay was also analyzed. Results: Five hub cuproptosis-related genes (Dihydrolipoamide S-acetyltransferase, Cyclin-dependent kinase inhibitor 2A, ATOX1, VEGFA, and ULK1) were screened and a prognostic risk model for predicting overall survival was established based on these genes. The model was successfully tested in the validation cohort and the GEPIA database. Colon adenocarcinoma patients were categorized into high-risk and low-risk groups based on risk scores. The study revealed that patients with higher risk scores were more likely to have a poor prognosis. Moreover, Dihydrolipoamide S-acetyltransferase was a tumor suppressor gene that can induce cell death and affected the redox reactions in the colon cancer cell line. Conclusions: These findings suggest that the newly identified 5-gene signature may serve as a more reliable prognostic factor than clinical factors such as age and stage of disease. These findings offer a theoretical foundation for further investigation into potential cuproptosis-related biomarkers for predicting colon adenocarcinoma prognosis in the future.
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Affiliation(s)
- Dongxue Wang
- Department of Radiology and Nuclear Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
| | - Funing Yang
- Department of Radiology and Nuclear Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
| | - Guiping Han
- Department of Pathology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
| | - Jifeng Zhang
- Department of Radiology and Nuclear Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
| | - Hongjia Wang
- Department of Radiology and Nuclear Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
| | - Zunyu Xiao
- Department of Nuclear Medicine, The First Affiliated Hospital of Ningbo University, Ningbo, Zhejiang, China
| | - Weiyu Chen
- Department of Respiratory and Critical Care Medicine, The Fourth Affiliated Hospital of Zhejiang University School of Medicine, Yiwu, Zhejiang, China
- International Institutes of Medicine, The Fourth Affiliated Hospital of Zhejiang University School of Medicine, Yiwu, Zhejiang, China
| | - Ping Li
- Department of Radiology and Nuclear Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
- Heilongjiang Key Laboratory for Accurate Diagnosis and Treatment of Coronary Heart Disease, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
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7
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Huh S, Yu HS, Kang N, Ahn YM, Kim YS, Kim SH. Electroconvulsive Seizure Normalizes Motor Deficits and Induces Autophagy Signaling in the MPTP-Induced Parkinson Disease Mouse Model. Psychiatry Investig 2023; 20:273-283. [PMID: 36990671 PMCID: PMC10064206 DOI: 10.30773/pi.2022.0327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 01/11/2022] [Indexed: 03/31/2023] Open
Abstract
OBJECTIVE Electroconvulsive seizure (ECS) is a potent treatment modality for various neuropsychiatric diseases, including Parkinson disease (PD). Recent animal studies showed that repeated ECS activates autophagy signaling, the impairment of which is known to be involved in PD. However, the effectiveness of ECS on PD and its therapeutic mechanisms have not yet been investigated in detail. METHODS Systemic injection of a neurotoxin 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine hydrochloride (MPTP), which destroys dopaminergic neurons in the substantia nigra compacta (SNc), in mice was utilized to induce an animal model of PD. Mice were treated with ECS 3 times per week for 2 weeks. Behavioral changes were measured with a rotarod test. Molecular changes related to autophagy signaling in midbrain including SNc, striatum, and prefrontal cortex were analyzed with immunohistochemistry and immunoblot analyses. RESULTS Repeated ECS treatments normalized the motor deficits and the loss of dopamiergic neurons in SNc of the MPTP PD mouse model. In the mouse model, LC3-II, an autophagy marker, was increased in midbrain while decreased in prefrontal cortex, both of which were reversed by repeated ECS treatments. In the prefrontal cortex, ECS-induced LC3-II increase was accompanied with AMP-activated protein kinase (AMPK)-Unc-51-like kinase 1-Beclin1 pathway activation and inhibition of mamalian target of rapamycin signaling which promotes autophagy initiation. CONCLUSION The findings revealed the therapeutic effects of repeated ECS treatments on PD, which could be attributed to the neuroprotective effect of ECS mediated by AMPK-autophagy signaling.
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Affiliation(s)
- Seonghoo Huh
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Hyun Sook Yu
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Nuree Kang
- Department of Psychiatry, Gyeongsang National University Hospital, Jinju, Republic of Korea
| | - Yong Min Ahn
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
- Department of Psychiatry, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yong Sik Kim
- Department of Psychiatry, Nowon Eulji Meical Center, Eulji University, Seoul, Republic of Korea
| | - Se Hyun Kim
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
- Department of Psychiatry, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
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8
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Ko TK, Tan DJY. Is Disrupted Mitophagy a Central Player to Parkinson's Disease Pathology? Cureus 2023; 15:e35458. [PMID: 36860818 PMCID: PMC9969326 DOI: 10.7759/cureus.35458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/25/2023] [Indexed: 02/27/2023] Open
Abstract
Whilst the pathophysiology at a cellular level has been defined, the cause of Parkinson's disease (PD) remains poorly understood. This neurodegenerative disorder is associated with impaired dopamine transmission in the substantia nigra, and protein accumulations known as Lewy bodies are visible in affected neurons. Cell culture models of PD have indicated impaired mitochondrial function, so the focus of this paper is on the quality control processes involved in and around mitochondria. Mitochondrial autophagy (mitophagy) is the process through which defective mitochondria are removed from the cell by internalisation into autophagosomes which fuse with a lysosome. This process involves many proteins, notably including PINK1 and parkin, both of which are known to be coded on genes associated with PD. Normally in healthy individuals, PINK1 associates with the outer mitochondrial membrane, which then recruits parkin, activating it to attach ubiquitin proteins to the mitochondrial membrane. PINK1, parkin, and ubiquitin cooperate to form a positive feedback system which accelerates the deposition of ubiquitin on dysfunctional mitochondria, resulting in mitophagy. However, in hereditary PD, the genes encoding PINK1 and parkin are mutated, resulting in proteins that are less efficient at removing poorly performing mitochondria, leaving cells more vulnerable to oxidative stress and ubiquitinated inclusion bodies, such as Lewy bodies. Current research that looks into the connection between mitophagy and PD is promising, already yielding potentially therapeutic compounds; until now, pharmacological support for the mitophagy process has not been part of the therapeutic arsenal. Continued research in this area is warranted.
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Affiliation(s)
- Tsz Ki Ko
- Otolaryngology, College of Life Sciences, Leicester Medical School, George Davies Centre, Leicester, GBR
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9
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Dias-Teixeira KL, Sharifian Gh M, Romano J, Norouzi F, Laurie GW. Autophagy in the normal and diseased cornea. Exp Eye Res 2022; 225:109274. [PMID: 36252655 PMCID: PMC10083687 DOI: 10.1016/j.exer.2022.109274] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/23/2022] [Accepted: 09/29/2022] [Indexed: 01/18/2023]
Abstract
The cornea and covering tear film are together the 'objective lens' of the eye through which 80% of light is refracted. Despite exposure to a physically harsh and at times infectious or toxic environment, transparency essential for sight is in most cases maintained. Such resiliency makes the avascular cornea a superb model for the exploration of autophagy in the regulation of homeostasis with relevancy to all organs. Nonetheless, missense mutations and inflammation respectively clog or apparently overwhelm autophagic flux to create dystrophies much like in neurodegenerative diseases or further exacerbate inflammation. Here there is opportunity to generate novel topical therapies towards the restoration of homeostasis with potential broad application.
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Affiliation(s)
| | | | - Jeff Romano
- Department of Cell Biology, University of Virginia, Charlottesville, VA, USA
| | - Fatemeh Norouzi
- Department of Cell Biology, University of Virginia, Charlottesville, VA, USA
| | - Gordon W Laurie
- Department of Cell Biology, University of Virginia, Charlottesville, VA, USA; Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, USA; Department of Ophthalmology, University of Virginia, Charlottesville, VA, USA.
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10
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Ma Y, Su Q, Yue C, Zou H, Zhu J, Zhao H, Song R, Liu Z. The Effect of Oxidative Stress-Induced Autophagy by Cadmium Exposure in Kidney, Liver, and Bone Damage, and Neurotoxicity. Int J Mol Sci 2022; 23:13491. [PMID: 36362277 PMCID: PMC9659299 DOI: 10.3390/ijms232113491] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 10/26/2022] [Accepted: 11/02/2022] [Indexed: 08/11/2023] Open
Abstract
Environmental and occupational exposure to cadmium has been shown to induce kidney damage, liver injury, neurodegenerative disease, and osteoporosis. However, the mechanism by which cadmium induces autophagy in these diseases remains unclear. Studies have shown that cadmium is an effective inducer of oxidative stress, DNA damage, ER stress, and autophagy, which are thought to be adaptive stress responses that allow cells exposed to cadmium to survive in an adverse environment. However, excessive stress will cause tissue damage by inducing apoptosis, pyroptosis, and ferroptosis. Evidently, oxidative stress-induced autophagy plays different roles in low- or high-dose cadmium exposure-induced cell damage, either causing apoptosis, pyroptosis, and ferroptosis or inducing cell survival. Meanwhile, different cell types have different sensitivities to cadmium, which ultimately determines the fate of the cell. In this review, we provided a detailed survey of the current literature on autophagy in cadmium-induced tissue damage. A better understanding of the complex regulation of cell death by autophagy might contribute to the development of novel preventive and therapeutic strategies to treat acute and chronic cadmium toxicity.
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Affiliation(s)
- Yonggang Ma
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Qunchao Su
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Chengguang Yue
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Hui Zou
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Jiaqiao Zhu
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Hongyan Zhao
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Ruilong Song
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Zongping Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
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11
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Function and regulation of ULK1: From physiology to pathology. Gene 2022; 840:146772. [PMID: 35905845 DOI: 10.1016/j.gene.2022.146772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/03/2022] [Accepted: 07/24/2022] [Indexed: 11/21/2022]
Abstract
The expression of ULK1, a core protein of autophagy, is closely related to autophagic activity. Numerous studies have shown that pathological abnormal expression of ULK1 is associated with various human diseases such as neurological disorders, infections, cardiovascular diseases, liver diseases and cancers. In addition, new advances in the regulation of ULK1 have been identified. Furthermore, targeting ULK1 as a therapeutic strategy for diseases is gaining attention as new corresponding activators or inhibitors are being developed. In this review, we describe the structure and regulation of ULK1 as well as the current targeted activators and inhibitors. Moreover, we highlight the pathological disorders of ULK1 expression and its critical role in human diseases.
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12
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Zou L, Liao M, Zhen Y, Zhu S, Chen X, Zhang J, Hao Y, Liu B. Autophagy and beyond: Unraveling the complexity of UNC-51-like kinase 1 (ULK1) from biological functions to therapeutic implications. Acta Pharm Sin B 2022; 12:3743-3782. [PMID: 36213540 PMCID: PMC9532564 DOI: 10.1016/j.apsb.2022.06.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 05/27/2022] [Accepted: 06/02/2022] [Indexed: 12/13/2022] Open
Abstract
UNC-51-like kinase 1 (ULK1), as a serine/threonine kinase, is an autophagic initiator in mammals and a homologous protein of autophagy related protein (Atg) 1 in yeast and of UNC-51 in Caenorhabditis elegans. ULK1 is well-known for autophagy activation, which is evolutionarily conserved in protein transport and indispensable to maintain cell homeostasis. As the direct target of energy and nutrition-sensing kinase, ULK1 may contribute to the distribution and utilization of cellular resources in response to metabolism and is closely associated with multiple pathophysiological processes. Moreover, ULK1 has been widely reported to play a crucial role in human diseases, including cancer, neurodegenerative diseases, cardiovascular disease, and infections, and subsequently targeted small-molecule inhibitors or activators are also demonstrated. Interestingly, the non-autophagy function of ULK1 has been emerging, indicating that non-autophagy-relevant ULK1 signaling network is also linked with diseases under some specific contexts. Therefore, in this review, we summarized the structure and functions of ULK1 as an autophagic initiator, with a focus on some new approaches, and further elucidated the key roles of ULK1 in autophagy and non-autophagy. Additionally, we also discussed the relationships between ULK1 and human diseases, as well as illustrated a rapid progress for better understanding of the discovery of more candidate small-molecule drugs targeting ULK1, which will provide a clue on novel ULK1-targeted therapeutics in the future.
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Affiliation(s)
- Ling Zou
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Minru Liao
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Yongqi Zhen
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Shiou Zhu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Xiya Chen
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
| | - Jin Zhang
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
- Corresponding authors. Tel./fax: +86 28 85503817.
| | - Yue Hao
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen 518060, China
- Corresponding authors. Tel./fax: +86 28 85503817.
| | - Bo Liu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
- Corresponding authors. Tel./fax: +86 28 85503817.
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13
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Shoket H, Parvez S, Sharma M, Pandita M, Sharma V, Kumar P, Bairwa NK. Deletion of autophagy related, ATG1 and F-box motif encoding YDR131C, together, lead to synthetic growth defects and flocculation behavior in Saccharomyces cerevisiae. J Biochem Mol Toxicol 2022; 36:e23064. [PMID: 35385166 DOI: 10.1002/jbt.23064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 02/22/2022] [Accepted: 03/23/2022] [Indexed: 11/09/2022]
Abstract
Ubiquitin proteasome system (UPS) and autophagy both pathways are involved in clearing the nonessential cellular components and also crosstalk during cellular response to normal and stress conditions. The F-box motif proteins constitute the SCF-E3 ligase complex of the UPS pathway in Saccharomyces cerevisiae and are involved in the substrate recruitment for ubiquitination. The ATG1 encoded Atg1p, a conserved serine-threonine kinase is crucial for the autophagy process. Here in this study, we report that loss of F-box motif encoding YDR131C and ATG1 together results in growth defects, floc formation, sensitivity to hydroxyurea, methyl methanesulfonate, and hydrogen peroxide. Both the genes also interact with the flocculation-related genes (FLO) and associate with gene ontology terms "ubiquitin-protein transferase activity" and "cellular catabolic process." Based on in silico analysis and experimental evidence we conclude that YDR131C and ATG1 function in parallel pathways to regulate the growth, flocculation, and stress response.
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Affiliation(s)
- Heena Shoket
- Genome Stability Regulation Lab, School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu & Kashmir, India
| | - Sadia Parvez
- Genome Stability Regulation Lab, School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu & Kashmir, India
| | - Meenu Sharma
- Genome Stability Regulation Lab, School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu & Kashmir, India
| | - Monika Pandita
- Genome Stability Regulation Lab, School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu & Kashmir, India
| | - Vishali Sharma
- Genome Stability Regulation Lab, School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu & Kashmir, India
| | - Prabhat Kumar
- Genome Stability Regulation Lab, School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu & Kashmir, India
| | - Narendra K Bairwa
- Genome Stability Regulation Lab, School of Biotechnology, Shri Mata Vaishno Devi University, Katra, Jammu & Kashmir, India
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14
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Over Fifty Years of Life, Death, and Cannibalism: A Historical Recollection of Apoptosis and Autophagy. Int J Mol Sci 2021; 22:ijms222212466. [PMID: 34830349 PMCID: PMC8618802 DOI: 10.3390/ijms222212466] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/02/2021] [Accepted: 11/03/2021] [Indexed: 01/18/2023] Open
Abstract
Research in biomedical sciences has changed dramatically over the past fifty years. There is no doubt that the discovery of apoptosis and autophagy as two highly synchronized and regulated mechanisms in cellular homeostasis are among the most important discoveries in these decades. Along with the advancement in molecular biology, identifying the genetic players in apoptosis and autophagy has shed light on our understanding of their function in physiological and pathological conditions. In this review, we first describe the history of key discoveries in apoptosis with a molecular insight and continue with apoptosis pathways and their regulation. We touch upon the role of apoptosis in human health and its malfunction in several diseases. We discuss the path to the morphological and molecular discovery of autophagy. Moreover, we dive deep into the precise regulation of autophagy and recent findings from basic research to clinical applications of autophagy modulation in human health and illnesses and the available therapies for many diseases caused by impaired autophagy. We conclude with the exciting crosstalk between apoptosis and autophagy, from the early discoveries to recent findings.
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15
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Brimson JM, Prasanth MI, Malar DS, Thitilertdecha P, Kabra A, Tencomnao T, Prasansuklab A. Plant Polyphenols for Aging Health: Implication from Their Autophagy Modulating Properties in Age-Associated Diseases. Pharmaceuticals (Basel) 2021; 14:ph14100982. [PMID: 34681206 PMCID: PMC8538309 DOI: 10.3390/ph14100982] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/13/2021] [Accepted: 09/19/2021] [Indexed: 02/06/2023] Open
Abstract
Polyphenols are a family of naturally occurring organic compounds, majorly present in fruits, vegetables, and cereals, characterised by multiple phenol units, including flavonoids, tannic acid, and ellagitannin. Some well-known polyphenols include resveratrol, quercetin, curcumin, epigallocatechin gallate, catechin, hesperetin, cyanidin, procyanidin, caffeic acid, and genistein. They can modulate different pathways inside the host, thereby inducing various health benefits. Autophagy is a conserved process that maintains cellular homeostasis by clearing the damaged cellular components and balancing cellular survival and overall health. Polyphenols could maintain autophagic equilibrium, thereby providing various health benefits in mediating neuroprotection and exhibiting anticancer and antidiabetic properties. They could limit brain damage by dismantling misfolded proteins and dysfunctional mitochondria, thereby activating autophagy and eliciting neuroprotection. An anticarcinogenic mechanism is stimulated by modulating canonical and non-canonical signalling pathways. Polyphenols could also decrease insulin resistance and inhibit loss of pancreatic islet β-cell mass and function from inducing antidiabetic activity. Polyphenols are usually included in the diet and may not cause significant side effects that could be effectively used to prevent and treat major diseases and ailments.
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Affiliation(s)
- James Michael Brimson
- Natural Products for Neuroprotection and Anti-Ageing Research Unit, Chulalongkorn University, Bangkok 10330, Thailand; (J.M.B.); (M.I.P.); (D.S.M.)
- Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Mani Iyer Prasanth
- Natural Products for Neuroprotection and Anti-Ageing Research Unit, Chulalongkorn University, Bangkok 10330, Thailand; (J.M.B.); (M.I.P.); (D.S.M.)
- Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Dicson Sheeja Malar
- Natural Products for Neuroprotection and Anti-Ageing Research Unit, Chulalongkorn University, Bangkok 10330, Thailand; (J.M.B.); (M.I.P.); (D.S.M.)
- Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Premrutai Thitilertdecha
- Siriraj Research Group in Immunobiology and Therapeutic Sciences, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10330, Thailand;
| | - Atul Kabra
- Department of Pharmacology, University Institute of Pharma Sciences, Chandigarh University, Sahibzad Ajit Singh Nagar 140413, Punjab, India;
| | - Tewin Tencomnao
- Natural Products for Neuroprotection and Anti-Ageing Research Unit, Chulalongkorn University, Bangkok 10330, Thailand; (J.M.B.); (M.I.P.); (D.S.M.)
- Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
- Correspondence: (T.T.); (A.P.)
| | - Anchalee Prasansuklab
- Natural Products for Neuroprotection and Anti-Ageing Research Unit, Chulalongkorn University, Bangkok 10330, Thailand; (J.M.B.); (M.I.P.); (D.S.M.)
- College of Public Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
- Correspondence: (T.T.); (A.P.)
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16
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Conformational plasticity of the ULK3 kinase domain. Biochem J 2021; 478:2811-2823. [PMID: 34190988 DOI: 10.1042/bcj20210257] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 06/25/2021] [Accepted: 06/30/2021] [Indexed: 01/11/2023]
Abstract
The human protein kinase ULK3 regulates the timing of membrane abscission, thus being involved in exosome budding and cytokinesis. Herein, we present the first high-resolution structures of the ULK3 kinase domain. Its unique features are explored against the background of other ULK kinases. An inhibitor fingerprint indicates that ULK3 is highly druggable and capable of adopting a wide range of conformations. In accordance with this, we describe a conformational switch between the active and an inactive ULK3 conformation, controlled by the properties of the attached small-molecule binder. Finally, we discuss a potential substrate-recognition mechanism of the full-length ULK3 protein.
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17
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Liu J, Cao S, Ding G, Wang B, Li Y, Zhao Y, Shao Q, Feng J, Liu S, Qin L, Xiao Y. The role of 14-3-3 proteins in cell signalling pathways and virus infection. J Cell Mol Med 2021; 25:4173-4182. [PMID: 33793048 PMCID: PMC8093981 DOI: 10.1111/jcmm.16490] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/06/2021] [Accepted: 03/13/2021] [Indexed: 12/14/2022] Open
Abstract
14-3-3 proteins are highly conserved in species ranging from yeast to mammals and regulate numerous signalling pathways via direct interactions with proteins carrying phosphorylated 14-3-3-binding motifs. Recent studies have shown that 14-3-3 proteins can also play a role in viral infections. This review summarizes the biological functions of 14-3-3 proteins in protein trafficking, cell-cycle control, apoptosis, autophagy and other cell signal transduction pathways, as well as the associated mechanisms. Recent findings regarding the role of 14-3-3 proteins in viral infection and innate immunity are also reviewed.
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Affiliation(s)
- Jiaqi Liu
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
| | - Shengliang Cao
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
| | - Guofei Ding
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
| | - Bin Wang
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
| | - Yingchao Li
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
| | - Yuzhong Zhao
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
| | - Qingyuan Shao
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
| | - Jian Feng
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
| | - Sidang Liu
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
| | - Liting Qin
- Shandong New Hope Liuhe Group Co., Ltd.QingdaoChina
- Qingdao Jiazhi Biotechnology Co., Ltd.QingdaoChina
| | - Yihong Xiao
- Department of Fundamental Veterinary MedicineCollege of Animal Science and Veterinary MedicineShandong Agricultural UniversityTai'anChina
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionShandong Agricultural UniversityTai’anChina
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18
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Cabrera-Rodríguez R, Pérez-Yanes S, Estévez-Herrera J, Márquez-Arce D, Cabrera C, Espert L, Blanco J, Valenzuela-Fernández A. The Interplay of HIV and Autophagy in Early Infection. Front Microbiol 2021; 12:661446. [PMID: 33995324 PMCID: PMC8113651 DOI: 10.3389/fmicb.2021.661446] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 03/31/2021] [Indexed: 12/11/2022] Open
Abstract
HIV/AIDS is still a global threat despite the notable efforts made by the scientific and health communities to understand viral infection, to design new drugs or to improve existing ones, as well as to develop advanced therapies and vaccine designs for functional cure and viral eradication. The identification and analysis of HIV-1 positive individuals that naturally control viral replication in the absence of antiretroviral treatment has provided clues about cellular processes that could interact with viral proteins and RNA and define subsequent viral replication and clinical progression. This is the case of autophagy, a degradative process that not only maintains cell homeostasis by recycling misfolded/old cellular elements to obtain nutrients, but is also relevant in the innate and adaptive immunity against viruses, such as HIV-1. Several studies suggest that early steps of HIV-1 infection, such as virus binding to CD4 or membrane fusion, allow the virus to modulate autophagy pathways preparing cells to be permissive for viral infection. Confirming this interplay, strategies based on autophagy modulation are able to inhibit early steps of HIV-1 infection. Moreover, autophagy dysregulation in late steps of the HIV-1 replication cycle may promote autophagic cell-death of CD4+ T cells or control of HIV-1 latency, likely contributing to disease progression and HIV persistence in infected individuals. In this scenario, understanding the molecular mechanisms underlying HIV/autophagy interplay may contribute to the development of new strategies to control HIV-1 replication. Therefore, the aim of this review is to summarize the knowledge of the interplay between autophagy and the early events of HIV-1 infection, and how autophagy modulation could impair or benefit HIV-1 infection and persistence, impacting viral pathogenesis, immune control of viral replication, and clinical progression of HIV-1 infected patients.
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Affiliation(s)
- Romina Cabrera-Rodríguez
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
| | - Silvia Pérez-Yanes
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
| | - Judith Estévez-Herrera
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
| | - Daniel Márquez-Arce
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
| | - Cecilia Cabrera
- AIDS Research Institute IrsiCaixa, Institut de Recerca en Ciències de la Salut Germans Trias i Pujol (IGTP), Barcelona, Spain
| | - Lucile Espert
- Institut de Recherche en Infectiologie de Montpellier, Université de Montpellier, CNRS, Montpellier, France
| | - Julià Blanco
- AIDS Research Institute IrsiCaixa, Institut de Recerca en Ciències de la Salut Germans Trias i Pujol (IGTP), Barcelona, Spain.,Universitat de Vic-Central de Catalunya (UVIC-UCC), Catalonia, Spain
| | - Agustín Valenzuela-Fernández
- Laboratorio de Inmunología Celular y Viral, Unidad de Farmacología, Sección de Medicina, Facultad de Ciencias de la Salud, e IUETSPC de la Universidad de La Laguna, Campus de Ofra s/n, Tenerife, Spain
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19
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Feyder M, Plewnia C, Lieberman OJ, Spigolon G, Piccin A, Urbina L, Dehay B, Li Q, Nilsson P, Altun M, Santini E, Sulzer D, Bezard E, Borgkvist A, Fisone G. Involvement of Autophagy in Levodopa-Induced Dyskinesia. Mov Disord 2021; 36:1137-1146. [PMID: 33460487 PMCID: PMC8248404 DOI: 10.1002/mds.28480] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 12/02/2020] [Accepted: 12/04/2020] [Indexed: 12/25/2022] Open
Abstract
Background Autophagy is intensively studied in cancer, metabolic and neurodegenerative diseases, but little is known about its role in pathological conditions linked to altered neurotransmission. We examined the involvement of autophagy in levodopa (l‐dopa)‐induced dyskinesia, a frequent motor complication developed in response to standard dopamine replacement therapy in parkinsonian patients. Methods We used mouse and non‐human primate models of Parkinson's disease to examine changes in autophagy associated with chronic l‐dopa administration and to establish a causative link between impaired autophagy and dyskinesia. Results We found that l‐dopa‐induced dyskinesia is associated with accumulation of the autophagy‐specific substrate p62, a marker of autophagy deficiency. Increased p62 was observed in a subset of projection neurons located in the striatum and depended on l‐dopa‐mediated activation of dopamine D1 receptors, and mammalian target of rapamycin. Inhibition of mammalian target of rapamycin complex 1 with rapamycin counteracted the impairment of autophagy produced by l‐dopa, and reduced dyskinesia. The anti‐dyskinetic effect of rapamycin was lost when autophagy was constitutively suppressed in D1 receptor‐expressing striatal neurons, through inactivation of the autophagy‐related gene protein 7. Conclusions These findings indicate that augmented responsiveness at D1 receptors leads to dysregulated autophagy, and results in the emergence of l‐dopa‐induced dyskinesia. They further suggest the enhancement of autophagy as a therapeutic strategy against dyskinesia. © 2021 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society
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Affiliation(s)
- Michael Feyder
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Carina Plewnia
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Ori J Lieberman
- Departments of Neurology, Pharmacology and Psychiatry, Columbia University, and New York State Psychiatric Institute, New York, New York, USA
| | - Giada Spigolon
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Alessandro Piccin
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Lidia Urbina
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Benjamin Dehay
- Univ. Bordeaux, CNRS, IMN, UMR 5293, Bordeaux, F-33000, France
| | - Qin Li
- Motac Neuroscience Ltd, Manchester, United Kingdom.,Institute of Laboratory Animal Sciences & China Academy of Medical Sciences, Beijing, China
| | - Per Nilsson
- Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Division of Neurogeriatrics, Karolinska Institutet, Stockholm, Sweden
| | - Mikael Altun
- Science for Life Laboratory, Department of Laboratory Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - Emanuela Santini
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Departments of Neurology, Pharmacology and Psychiatry, Columbia University, and New York State Psychiatric Institute, New York, New York, USA
| | - David Sulzer
- Departments of Neurology, Pharmacology and Psychiatry, Columbia University, and New York State Psychiatric Institute, New York, New York, USA
| | - Erwan Bezard
- Univ. Bordeaux, CNRS, IMN, UMR 5293, Bordeaux, F-33000, France.,Motac Neuroscience Ltd, Manchester, United Kingdom
| | - Anders Borgkvist
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Departments of Neurology, Pharmacology and Psychiatry, Columbia University, and New York State Psychiatric Institute, New York, New York, USA
| | - Gilberto Fisone
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
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20
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Deng R, Zhang HL, Huang JH, Cai RZ, Wang Y, Chen YH, Hu BX, Ye ZP, Li ZL, Mai J, Huang Y, Li X, Peng XD, Feng GK, Li JD, Tang J, Zhu XF. MAPK1/3 kinase-dependent ULK1 degradation attenuates mitophagy and promotes breast cancer bone metastasis. Autophagy 2020; 17:3011-3029. [PMID: 33213267 DOI: 10.1080/15548627.2020.1850609] [Citation(s) in RCA: 91] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The function of mitophagy in cancer is controversial. ULK1 is critical for induction of macroautophagy/autophagy and has a more specific role in mitophagy in response to hypoxia. Here, we show that ULK1 deficiency induces an invasive phenotype of breast cancer cells under hypoxia and increases osteolytic bone metastasis. Mechanistically, ULK1 depletion attenuates mitophagy ability during hypoxia. As a result, the accumulation of damaged, ROS-generating mitochondria leads to activation of the NLRP3 inflammasome, which induces abnormal soluble cytokines secretion, then promotes the differentiation and maturation of osteoclasts, and ultimately results in bone metastasis. Notably, phosphorylation of ULK1 by MAPK1/ERK2-MAPK3/ERK1 kinase triggers its interaction with BTRC and subsequent K48-linked ubiquitination and proteasome degradation. Also, a clearly negative correlation between the expression levels of ULK1 and p-MAPK1/3 was observed in human breast cancer tissues. The MAP2K/MEK inhibitor trametinib is sufficient to restore mitophagy function via upregulation of ULK1, leading to inhibition of NLRP3 inflammasome activation, thereby reduces bone metastasis. These results indicate that ULK1 knockout-mediated mitophagy defect promotes breast cancer bone metastasis and provide evidence to explore MAP2K/MEK- MAPK1/3 pathway inhibitors for therapy, especially in cancers displaying low levels of ULK1.Abbreviations: ATG: autophagy-related; Baf A1: bafilomycin A1; BTRC/β-TrCP: beta-transducin repeat containing E3 ubiquitin protein ligase; CHX: cycloheximide; CM: conditioned media; FBXW7/FBW7: F-box and WD repeat domain containing 7; MAPK1: mitogen-activated protein kinase 1; MTDR: MitoTracker Deep Red; mtROS: mitochondrial reactive oxygen species; microCT: micro-computed tomography; mtROS: mitochondrial reactive oxygen species; OCR: oxygen consumption rate; SQSTM1: sequestosome 1; ACP5/TRAP: acid phosphatase, tartrate resistant; ULK1: unc-51 like autophagy activating kinase 1.
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Affiliation(s)
- Rong Deng
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Hai-Liang Zhang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Jun-Hao Huang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China.,Department of Breast Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Rui-Zhao Cai
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China.,Department of Breast Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Yan Wang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China.,Department of Breast Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Yu-Hong Chen
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Bing-Xin Hu
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Zhi-Peng Ye
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Zhi-Ling Li
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Jia Mai
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Yun Huang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Xuan Li
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Xiao-Dan Peng
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Gong-Kan Feng
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Jun-Dong Li
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China.,Department of Gynecological Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Jun Tang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China.,Department of Breast Oncology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Xiao-Feng Zhu
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, China
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21
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Tang Y, Tao Y, Wang L, Yang L, Jing Y, Jiang X, Lei L, Yang Z, Wang X, Peng M, Xiao Q, Ren J, Zhang L. NPM1 mutant maintains ULK1 protein stability via TRAF6‐dependent ubiquitination to promote autophagic cell survival in leukemia. FASEB J 2020; 35:e21192. [DOI: 10.1096/fj.201903183rrr] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 09/06/2020] [Accepted: 10/29/2020] [Indexed: 01/08/2023]
Affiliation(s)
- Yuting Tang
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
| | - Yao Tao
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
| | - Lu Wang
- Department of Clinical Laboratory University‐Town HospitalChongqing Medical University Chongqing China
| | - Liyuan Yang
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
| | - Yipei Jing
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
| | - Xueke Jiang
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
| | - Li Lei
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
| | - Zailin Yang
- Department of Clinical Laboratory The Third Affiliated Hospital of Chongqing Medical University Chongqing China
| | - Xin Wang
- Department of Hematology The First Affiliated Hospital of Chongqing Medical University Chongqing China
| | - Meixi Peng
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
| | - Qiaoling Xiao
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
| | - Jun Ren
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
| | - Ling Zhang
- Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education School of Laboratory Medicine Chongqing Medical University Chongqing China
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22
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Hait AS, Thomsen MM, Larsen SM, Helleberg M, Mardahl M, Barfod TS, Christiansen M, Brandt C, Mogensen TH. Whole-Exome Sequencing of Patients With Recurrent HSV-2 Lymphocytic Mollaret Meningitis. J Infect Dis 2020; 223:1776-1786. [PMID: 32946550 DOI: 10.1093/infdis/jiaa589] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 09/17/2020] [Indexed: 12/19/2022] Open
Abstract
Recurrent lymphocytic meningitis, also referred to as Mollaret meningitis, is a rare neurological disease characterized mainly by reactivation of herpes simplex virus 2 (HSV-2) from sensory ganglia. However, the underlying host immune determinants and viral factors rendering some individuals unable to maintain HSV-2 latency are largely unknown. We collected a cohort of 15 patients diagnosed with Mollaret meningitis. By whole-exome sequencing we identified rare host genetic variants predicted to be deleterious in molecules involved in (1) ubiquitin-proteasome pathways, (2) the autophagy machinery, and (3) cell proliferation/apoptosis. Moreover, infection of patient cells with HSV-2 or stimulation by virus-derived double-stranded DNA ligands revealed reduced antiviral interferon responses in most patients. These findings may contribute to a better understanding of disease pathogenesis and protective immunity to HSV in the central nervous system, and may ultimately be of importance for identification of targets for development of improved prophylaxis and treatment of this disease.
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Affiliation(s)
- Alon Schneider Hait
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Michelle M Thomsen
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Simon M Larsen
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark
| | - Marie Helleberg
- Department of Infectious Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Maibritt Mardahl
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark
| | - Toke S Barfod
- Department of Internal medicine, Section for Infectious Diseases, Zealand University Hospital, Roskilde, Denmark
| | - Mette Christiansen
- Department of Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Christian Brandt
- Department of Internal medicine, Section for Infectious Diseases, Zealand University Hospital, Roskilde, Denmark.,Department of Pulmonology and Infectious Diseases, Nordsjællands Hospital, Hillerød, Denmark
| | - Trine H Mogensen
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark.,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
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23
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Kim K, Park SG, Park BC, Kim JH, Kim S. Serine 389 phosphorylation of 3-phosphoinositide-dependent kinase 1 by UNC-51-like kinase 1 affects its ability to regulate Akt and p70 S6kinase. BMB Rep 2020. [PMID: 32317083 PMCID: PMC7396916 DOI: 10.5483/bmbrep.2020.53.7.299] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Phosphorylation of the signaling component by protein kinase often leads to a kinase cascade or feedback loop. 3-Phosphoinositide-dependent kinase 1 (PDK1) signaling pathway diverges into various kinases including Akt and p70 S6 kinase (p70S6k). However, the PDK1 feedback mechanism remains elusive. Here, we demonstrated that UNC-51-like kinase (ULK1), an autophagy initiator kinase downstream of mechanistic target of rapamycin (mTOR), directly phosphorylated PDK1 on serine 389 at the linker region. Furthermore, our data showed that this phosphorylation affected the kinase activity of PDK1 toward downstream substrates. These results suggest a possible negative feedback loop between PDK1 and ULK1.
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Affiliation(s)
- Kidae Kim
- Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Korea
- Department of Proteome Structural biology, KRIBB School of Bioscience, Korea University of Science and Technology, Daejeon 34113, Korea
| | - Sung Goo Park
- Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Korea
- Department of Functional Genomics, KRIBB School of Bioscience, Korea University of Science and Technology, Daejeon 34113, Korea
| | - Byoung Chul Park
- Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Korea
- Department of Proteome Structural biology, KRIBB School of Bioscience, Korea University of Science and Technology, Daejeon 34113, Korea
| | - Jeong-Hoon Kim
- Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Korea
- Department of Functional Genomics, KRIBB School of Bioscience, Korea University of Science and Technology, Daejeon 34113, Korea
| | - Sunhong Kim
- Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Korea
- Department of Bio-Molecular Science, KRIBB School of Bioscience, Korea University of Science and Technology, Daejeon 34113, Korea
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24
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Wong SQ, Kumar AV, Mills J, Lapierre LR. C. elegans to model autophagy-related human disorders. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2020; 172:325-373. [PMID: 32620247 DOI: 10.1016/bs.pmbts.2020.01.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Autophagy is a highly conserved degradation process that clears damaged intracellular macromolecules and organelles in order to maintain cellular health. Dysfunctional autophagy is fundamentally linked to the development of various human disorders and pathologies. The use of the nematode Caenorhabditis elegans as a model system to study autophagy has improved our understanding of its regulation and function in organismal physiology. Here, we review the genetic, functional, and regulatory conservation of the autophagy pathway in C. elegans and we describe tools to quantify and study the autophagy process in this incredibly useful model organism. We further discuss how these nematodes have been modified to model autophagy-related human diseases and underscore the important insights obtained from such models. Altogether, we highlight the strengths of C. elegans as an exceptional tool to understand the genetic and molecular foundations underlying autophagy-related human diseases.
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Affiliation(s)
- Shi Quan Wong
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, United States
| | - Anita V Kumar
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, United States
| | - Joslyn Mills
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, United States
| | - Louis R Lapierre
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, United States.
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25
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Haeussler S, Köhler F, Witting M, Premm MF, Rolland SG, Fischer C, Chauve L, Casanueva O, Conradt B. Autophagy compensates for defects in mitochondrial dynamics. PLoS Genet 2020; 16:e1008638. [PMID: 32191694 PMCID: PMC7135339 DOI: 10.1371/journal.pgen.1008638] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 04/06/2020] [Accepted: 01/28/2020] [Indexed: 12/30/2022] Open
Abstract
Compromising mitochondrial fusion or fission disrupts cellular homeostasis; however, the underlying mechanism(s) are not fully understood. The loss of C. elegans fzo-1MFN results in mitochondrial fragmentation, decreased mitochondrial membrane potential and the induction of the mitochondrial unfolded protein response (UPRmt). We performed a genome-wide RNAi screen for genes that when knocked-down suppress fzo-1MFN(lf)-induced UPRmt. Of the 299 genes identified, 143 encode negative regulators of autophagy, many of which have previously not been implicated in this cellular quality control mechanism. We present evidence that increased autophagic flux suppresses fzo-1MFN(lf)-induced UPRmt by increasing mitochondrial membrane potential rather than restoring mitochondrial morphology. Furthermore, we demonstrate that increased autophagic flux also suppresses UPRmt induction in response to a block in mitochondrial fission, but not in response to the loss of spg-7AFG3L2, which encodes a mitochondrial metalloprotease. Finally, we found that blocking mitochondrial fusion or fission leads to increased levels of certain types of triacylglycerols and that this is at least partially reverted by the induction of autophagy. We propose that the breakdown of these triacylglycerols through autophagy leads to elevated metabolic activity, thereby increasing mitochondrial membrane potential and restoring mitochondrial and cellular homeostasis.
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Affiliation(s)
- Simon Haeussler
- Faculty of Biology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Fabian Köhler
- Faculty of Biology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Michael Witting
- Research Unit Analytical BioGeoChemistry, Helmholtz Zentrum München, Neuherberg, Germany
- Chair of Analytical Food Chemistry, Technische Universität München, Freising, Germany
| | - Madeleine F. Premm
- Faculty of Biology, Ludwig-Maximilians-University Munich, Munich, Germany
| | | | - Christian Fischer
- Faculty of Biology, Ludwig-Maximilians-University Munich, Munich, Germany
- Center for Integrated Protein Science, Ludwig-Maximilians-University Munich, Planegg-Martinsried, Germany
| | - Laetitia Chauve
- Epigenetics Programme, The Babraham Institute, Cambridge, United Kingdom
| | - Olivia Casanueva
- Epigenetics Programme, The Babraham Institute, Cambridge, United Kingdom
| | - Barbara Conradt
- Faculty of Biology, Ludwig-Maximilians-University Munich, Munich, Germany
- Center for Integrated Protein Science, Ludwig-Maximilians-University Munich, Planegg-Martinsried, Germany
- Department of Cell and Developmental Biology, Division of Biosciences, University College London, London, United Kingdom
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26
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Mechanisms of Autophagy in Metabolic Stress Response. J Mol Biol 2020; 432:28-52. [DOI: 10.1016/j.jmb.2019.09.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 09/06/2019] [Accepted: 09/06/2019] [Indexed: 01/17/2023]
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27
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Pervaiz S, Bellot GL, Lemoine A, Brenner C. Redox signaling in the pathogenesis of human disease and the regulatory role of autophagy. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2020; 352:189-214. [DOI: 10.1016/bs.ircmb.2020.03.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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28
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Saleiro D, Platanias LC. Interferon signaling in cancer. Non-canonical pathways and control of intracellular immune checkpoints. Semin Immunol 2019; 43:101299. [PMID: 31771762 PMCID: PMC8177745 DOI: 10.1016/j.smim.2019.101299] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 08/11/2019] [Indexed: 01/01/2023]
Abstract
The interferons (IFNs) are cytokines with important antineoplastic and immune modulatory effects. These cytokines have been conserved through evolution as important elements of the immune surveillance against cancer. Despite this, defining their precise and specific roles in the generation of antitumor responses remains challenging. Emerging evidence suggests the existence of previously unknown roles for IFNs in the control of the immune response against cancer that may redefine our understanding on how these cytokines function. Beyond the engagement of classical JAK-STAT signaling pathways that promote transcription and expression of gene products, the IFNs engage multiple other signaling cascades to generate products that mediate biological responses and outcomes. There is recent emerging evidence indicating that IFNs control the expression of both traditional immune checkpoints like the PD-L1/PD1 axis, but also less well understood "intracellular" immune checkpoints whose targeting may define new approaches for the treatment of malignancies.
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Affiliation(s)
- Diana Saleiro
- Robert H. Lurie Comprehensive Cancer Center and Division of Hematology-Oncology, Feinberg School of Medicine, Northwestern University, 303 East Superior Ave., Chicago, IL 60611, USA
| | - Leonidas C Platanias
- Robert H. Lurie Comprehensive Cancer Center and Division of Hematology-Oncology, Feinberg School of Medicine, Northwestern University, 303 East Superior Ave., Chicago, IL 60611, USA; Department of Medicine, Jesse Brown Veterans Affairs Medical Center, 820 S. Damen Ave., Chicago, IL 60612, USA.
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29
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Mishra R, Upadhyay A, Prajapati VK, Dhiman R, Poluri KM, Jana NR, Mishra A. LRSAM1 E3 ubiquitin ligase: molecular neurobiological perspectives linked with brain diseases. Cell Mol Life Sci 2019; 76:2093-2110. [PMID: 30826859 PMCID: PMC11105512 DOI: 10.1007/s00018-019-03055-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Revised: 02/13/2019] [Accepted: 02/21/2019] [Indexed: 01/01/2023]
Abstract
Cellular protein quality control (PQC) plays a significant role in the maintenance of cellular homeostasis. Failure of PQC mechanism may lead to various neurodegenerative diseases due to accumulation of aberrant proteins. To avoid such fatal neuronal conditions PQC employs autophagy and ubiquitin proteasome system (UPS) to degrade misfolded proteins. Few quality control (QC) E3 ubiquitin ligases interplay an important role to specifically recognize misfolded proteins for their intracellular degradation. Leucine-rich repeat and sterile alpha motif-containing 1 (LRSAM1) is a really interesting new gene (RING) class protein that possesses E3 ubiquitin ligase activity with promising applications in PQC. LRSAM1 is also known as RING finger leucine repeat rich (RIFLE) or TSG 101-associated ligase (TAL). LRSAM1 has various cellular functions as it modulates the protein aggregation, endosomal sorting machinery and virus egress from the cells. Thus, this makes LRSAM1 interesting to study not only in protein conformational disorders such as neurodegeneration but also in immunological and other cancerous disorders. Furthermore, LRSAM1 interacts with both cellular protein degradation machineries and hence it can participate in maintenance of overall cellular proteostasis. Still, more research work on the quality control molecular functions of LRSAM1 is needed to comprehend its roles in various protein aggregatory diseases. Earlier findings suggest that in a mouse model of Charcot-Marie-Tooth (CMT) disease, lack of LRSAM1 functions sensitizes peripheral axons to degeneration. It has been observed that in CMT the patients retain dominant and recessive mutations of LRSAM1 gene, which encodes most likely a defective protein. However, still the comprehensive molecular pathomechanism of LRSAM1 in neuronal functions and neurodegenerative diseases is not known. The current article systematically represents the molecular functions, nature and detailed characterization of LRSAM1 E3 ubiquitin ligase. Here, we review emerging molecular mechanisms of LRSAM1 linked with neurobiological functions, with a clear focus on the mechanism of neurodegeneration and also on other diseases. Better understanding of LRSAM1 neurobiological and intracellular functions may contribute to develop promising novel therapeutic approaches, which can also propose new lines of molecular beneficial targets for various neurodegenerative diseases.
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Affiliation(s)
- Ribhav Mishra
- Cellular and Molecular Neurobiology Unit, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, 342037, India
| | - Arun Upadhyay
- Cellular and Molecular Neurobiology Unit, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, 342037, India
| | - Vijay Kumar Prajapati
- Department of Biochemistry, School of Life Sciences, Central University of Rajasthan, NH-8 Bandarsindri, Ajmer, Rajasthan, 305817, India
| | - Rohan Dhiman
- Laboratory of Mycobacterial Immunology, Department of Life Science, National Institute of Technology, Rourkela, Odisha, 769008, India
| | - Krishna Mohan Poluri
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India
| | - Nihar Ranjan Jana
- School of Bioscience, Indian Institute of Technology, Kharagpur, Kharagpur, 721302, India
| | - Amit Mishra
- Cellular and Molecular Neurobiology Unit, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, 342037, India.
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30
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Palmisano NJ, Meléndez A. Autophagy in C. elegans development. Dev Biol 2019; 447:103-125. [PMID: 29709599 PMCID: PMC6204124 DOI: 10.1016/j.ydbio.2018.04.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 03/19/2018] [Accepted: 04/12/2018] [Indexed: 12/11/2022]
Abstract
Autophagy involves the sequestration of cytoplasmic contents in a double-membrane structure referred to as the autophagosome and the degradation of its contents upon delivery to lysosomes. Autophagy activity has a role in multiple biological processes during the development of the nematode Caenorhabditis elegans. Basal levels of autophagy are required to remove aggregate prone proteins, paternal mitochondria, and spermatid-specific membranous organelles. During larval development, autophagy is required for the remodeling that occurs during dauer development, and autophagy can selectively degrade components of the miRNA-induced silencing complex, and modulate miRNA-mediated silencing. Basal levels of autophagy are important in synapse formation and in the germ line, to promote the proliferation of proliferating stem cells. Autophagy activity is also required for the efficient removal of apoptotic cell corpses by promoting phagosome maturation. Finally, autophagy is also involved in lipid homeostasis and in the aging process. In this review, we first describe the molecular complexes involved in the process of autophagy, its regulation, and mechanisms for cargo recognition. In the second section, we discuss the developmental contexts where autophagy has been shown to be important. Studies in C. elegans provide valuable insights into the physiological relevance of this process during metazoan development.
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Affiliation(s)
- Nicholas J Palmisano
- Biology Department, Queens College, CUNY, Flushing, NY, USA; Biology Ph.D. Program, The Graduate Center of the City University of New York, NK, USA
| | - Alicia Meléndez
- Biology Department, Queens College, CUNY, Flushing, NY, USA; Biology Ph.D. Program, The Graduate Center of the City University of New York, NK, USA; Biochemistry Ph.D. Program, The Graduate Center of the City University of New York, NY, USA.
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31
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Corona Velazquez AF, Jackson WT. So Many Roads: the Multifaceted Regulation of Autophagy Induction. Mol Cell Biol 2018; 38:e00303-18. [PMID: 30126896 PMCID: PMC6189458 DOI: 10.1128/mcb.00303-18] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Autophagy is an evolutionary conserved, degradative process from single-cell eukaryotes, such as Saccharomyces cerevisiae, to higher mammals, such as humans. The regulation of autophagy has been elucidated through the combined study of yeast, Caenorhabditis elegans, mice, Drosophila melanogaster, and humans. MTOR, the major negative regulator of autophagy, and activating nutrient kinases, such as 5'-AMP-activated protein kinase (AMPK), interact with the autophagy regulatory complex: ULK1/2, RB1CC1, ATG13, and ATG101. The ULK1/2 complex induces autophagy by phosphorylating downstream autophagy complexes, such as the BECN1 PIK3 signaling complex that leads to the creation of LC3+ autophagosomes. We highlight in this review various reports of autophagy induction that are independent of these regulators. We discuss reports of MTOR-independent, AMPK-independent, ULK1/2-independent, and BECN1-PIK3C3-independent autophagy. We illustrate that autophagy induction and the components required vary by the nature of the induction signal and type of cell and do not always require canonical members of the autophagy signaling pathway. We illustrate that rather than thinking of autophagy as a linear pathway, it is better to think of autophagy induction as an interconnecting web of key regulators, many of which can induce autophagy through different requirements depending on the type and length of induction signals.
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Affiliation(s)
- Angel F Corona Velazquez
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - William T Jackson
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
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Autophagy Is a Promoter for Aerobic Exercise Performance during High Altitude Training. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:3617508. [PMID: 29849885 PMCID: PMC5907404 DOI: 10.1155/2018/3617508] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 03/10/2018] [Accepted: 03/15/2018] [Indexed: 01/10/2023]
Abstract
High altitude training is one of the effective strategies for improving aerobic exercise performance at sea level via altitude acclimatization, thereby improving oxygen transport and/or utilization. But its underlying molecular mechanisms on physiological functions and exercise performance of athletes are still vague. More recent evidence suggests that the recycling of cellular components by autophagy is an important process of the body involved in the adaptive responses to exercise. Whether high altitude training can activate autophagy or whether high altitude training can improve exercise performance through exercise-induced autophagy is still unclear. In this narrative review article, we will summarize current research advances in the improvement of exercise performance through high altitude training and its reasonable molecular mechanisms associated with autophagy, which will provide a new field to explore the molecular mechanisms of adaptive response to high altitude training.
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Zhang L, Ouyang L, Guo Y, Zhang J, Liu B. UNC-51-like Kinase 1: From an Autophagic Initiator to Multifunctional Drug Target. J Med Chem 2018; 61:6491-6500. [PMID: 29509411 DOI: 10.1021/acs.jmedchem.7b01684] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
UNC-51-like kinase 1 (ULK1), known as an ortholog of the yeast Atg1, is the serine-threonine kinase and the autophagic initiator in mammals. Accumulating evidence has recently revealed the kinase domain structure of ULK1 and its post-translational modifications, as well as further elucidated its regulatory autophagic pathways and associations with diverse human diseases. Interestingly, a series of small molecules have been recently reported to target ULK1 or ULK1-modulating autophagy, which may provide a clue on exploiting them as novel candidate drugs. Taken together, this review discusses how ULK1 acts as an autophagic initiator for modulation of its intricate mechanisms, as well as how ULK1 becomes a multifunctional target for potential therapeutic applications.
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Affiliation(s)
- Lan Zhang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital , Sichuan University and Collaborative Innovation Center of Biotherapy , Chengdu 610041 , China
| | - Liang Ouyang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital , Sichuan University and Collaborative Innovation Center of Biotherapy , Chengdu 610041 , China
| | - Yongzhi Guo
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital , Sichuan University and Collaborative Innovation Center of Biotherapy , Chengdu 610041 , China
| | - Jin Zhang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital , Sichuan University and Collaborative Innovation Center of Biotherapy , Chengdu 610041 , China
| | - Bo Liu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital , Sichuan University and Collaborative Innovation Center of Biotherapy , Chengdu 610041 , China
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Kim SH, Park S, Yu HS, Ko KH, Park HG, Kim YS. The antipsychotic agent clozapine induces autophagy via the AMPK-ULK1-Beclin1 signaling pathway in the rat frontal cortex. Prog Neuropsychopharmacol Biol Psychiatry 2018; 81:96-104. [PMID: 29079139 DOI: 10.1016/j.pnpbp.2017.10.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Revised: 10/23/2017] [Accepted: 10/23/2017] [Indexed: 01/08/2023]
Abstract
Clozapine, a representative atypical antipsychotic, has superior efficacy compared to other antipsychotic agents and is used for the treatment of severe psychotic disorders. Therefore, studies on its mechanisms of action are important for understanding the mechanisms of therapeutic approaches to psychosis. Adenosine monophosphate-activated protein kinase (AMPK) is a serine-threonine kinase that plays a major role in maintaining metabolic homeostasis. Unc-51-like kinase 1 (ULK1) and Beclin1 are downstream substrates of AMPK and activate the autophagic process. In this study, we examined the effects of clozapine on the AMPK-ULK1-Beclin1 signaling pathway and autophagy in the frontal cortex of the rat. Clozapine (10mg/kg) administration increased the immunoreactivity of p-Thr172-AMPKα in the rat frontal cortex at 1, 2, and 4h after injection, as we previously reported. The immunoreactivity of p-Ser317-ULK1 and p-Ser93-Beclin1 was also increased at 2 and 4h after clozapine injection. At the same time, the immunoreactivity of LC3-II and the Atg5-Atg12 conjugate, which indicate activation of autophagy, was increased. Transmission electron microscopy clearly showed an increase in autophagosome number in the rat frontal cortex at 2h after clozapine injection. To investigate the role of AMPK in clozapine-induced autophagy, the effects of intracerebroventricular injection of compound C, an AMPK inhibitor, were examined. Administration of compound C attenuated the clozapine-induced increase in ULK1 and Beclin1 phosphorylation, as well the protein levels of LC3-II and the Atg5-Atg12 conjugate in the frontal cortex. In summary, the results showed that clozapine activates autophagy through the AMPK-ULK1-Beclin1 signaling pathway in the frontal cortex of the rat.
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Affiliation(s)
- Se Hyun Kim
- Department of Neuropsychiatry, Dongguk University International Hospital, Dongguk University Medical School, Goyang-si, Gyeonggi-do, Republic of Korea
| | - Soyoung Park
- Department of Neuropsychiatry, Dongguk University International Hospital, Dongguk University Medical School, Goyang-si, Gyeonggi-do, Republic of Korea
| | - Hyun Sook Yu
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Kyung Hee Ko
- Department of Neuropsychiatry, Dongguk University International Hospital, Dongguk University Medical School, Goyang-si, Gyeonggi-do, Republic of Korea
| | - Hong Geun Park
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Yong Sik Kim
- Department of Neuropsychiatry, Dongguk University International Hospital, Dongguk University Medical School, Goyang-si, Gyeonggi-do, Republic of Korea.
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Clinical application of SNP array analysis in fetuses with ventricular septal defects and normal karyotypes. Arch Gynecol Obstet 2017; 296:929-940. [DOI: 10.1007/s00404-017-4518-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 09/04/2017] [Indexed: 10/18/2022]
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Autophagy wins the 2016 Nobel Prize in Physiology or Medicine: Breakthroughs in baker's yeast fuel advances in biomedical research. Proc Natl Acad Sci U S A 2016; 114:201-205. [PMID: 28039434 DOI: 10.1073/pnas.1619876114] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Autophagy is an ancient pathway in which parts of eukaryotic cells are self-digested within the lysosome or vacuole. This process has been studied for the past seven decades; however, we are only beginning to gain a molecular understanding of the key steps required for autophagy. Originally characterized as a hormonal and starvation response, we now know that autophagy has a much broader role in biology, including organellar remodeling, protein and organelle quality control, prevention of genotoxic stress, tumor suppression, pathogen elimination, regulation of immunity and inflammation, maternal DNA inheritance, metabolism, and cellular survival. Although autophagy is usually a degradative pathway, it also participates in biosynthetic and secretory processes. Given that autophagy has a fundamental role in many essential cellular functions, it is not surprising that autophagic dysfunction is associated with a wide range of human diseases. Genetic studies in various fungi, particularly Saccharomyces cerevisiae, provided the key initial breakthrough that led to an explosion of research on the basic mechanisms and the physiological connections of autophagy to health and disease. The Nobel Committee has recognized this breakthrough by the awarding of the 2016 Nobel Prize in Physiology or Medicine for research in autophagy.
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Li M, Lindblad JL, Perez E, Bergmann A, Fan Y. Autophagy-independent function of Atg1 for apoptosis-induced compensatory proliferation. BMC Biol 2016; 14:70. [PMID: 27542914 PMCID: PMC4992243 DOI: 10.1186/s12915-016-0293-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Accepted: 08/08/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND ATG1 belongs to the Uncoordinated-51-like kinase protein family. Members of this family are best characterized for roles in macroautophagy and neuronal development. Apoptosis-induced proliferation (AiP) is a caspase-directed and JNK-dependent process which is involved in tissue repair and regeneration after massive stress-induced apoptotic cell loss. Under certain conditions, AiP can cause tissue overgrowth with implications for cancer. RESULTS Here, we show that Atg1 in Drosophila (dAtg1) has a previously unrecognized function for both regenerative and overgrowth-promoting AiP in eye and wing imaginal discs. dAtg1 acts genetically downstream of and is transcriptionally induced by JNK activity, and it is required for JNK-dependent production of mitogens such as Wingless for AiP. Interestingly, this function of dAtg1 in AiP is independent of its roles in autophagy and in neuronal development. CONCLUSION In addition to a role of dAtg1 in autophagy and neuronal development, we report a third function of dAtg1 for AiP.
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Affiliation(s)
- Mingli Li
- University of Birmingham, School of Biosciences, Edgbaston, Birmingham, B15 2TT, UK
| | - Jillian L Lindblad
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, 364 Plantation Street, LRB419, Worcester, MA, 01605, USA
| | - Ernesto Perez
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, 364 Plantation Street, LRB419, Worcester, MA, 01605, USA
| | - Andreas Bergmann
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, 364 Plantation Street, LRB419, Worcester, MA, 01605, USA.
| | - Yun Fan
- University of Birmingham, School of Biosciences, Edgbaston, Birmingham, B15 2TT, UK.
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Rothschild SI, Gautschi O, Batliner J, Gugger M, Fey MF, Tschan MP. MicroRNA-106a targets autophagy and enhances sensitivity of lung cancer cells to Src inhibitors. Lung Cancer 2016; 107:73-83. [PMID: 27372519 DOI: 10.1016/j.lungcan.2016.06.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 05/30/2016] [Accepted: 06/10/2016] [Indexed: 02/07/2023]
Abstract
OBJECTIVES Src tyrosine kinase inhibitors (TKIs) significantly inhibit cell migration and invasion in lung cancer cell lines with minor cytotoxic effects. In clinical trials, however, they show modest activity in combination with chemotherapeutic agents. Possible resistance mechanisms include the induction of cytoprotective autophagy upon Src inhibition. Autophagy is a cellular recycling process that allows cell survival in response to a variety of stress stimuli including responses to various treatments. MATERIAL AND METHODS We screened autophagic activity in A549, H460, and H1299 NSCLC cell lines treated with two different Src-TKIs (saracatinib, dasatinib) or shRNA targeting SRC. The autophagy response was determined by LC3B-I to -II conversion, increased ULK1 epxression and increased GFP-LC3B dot formation. Autophagy was inhibited by pharmacological (bafilomycin A, chloroquine) or genetic (ULK1 shRNA) means. Expression of miR-106a and miR-20b was analyzed by qPCR, and we used different lentivral vectors for ectopic expression of either miR-106a mimetics, anti-sense miR-106a or different miR-106a-363 cluster constructs. RESULTS In the current study we found that Src-TKIs induce autophagy in lung adenocarcinoma cell lines and that a combination of autophagy and Src tyrosine kinase inhibition results in cell death. Moreover, Src-TKI induced autophagy depends on the induction of the key autophagy kinase ULK1. This ULK1 upregulation is caused by downregulation of the ULK1-targeting microRNA-106a. An inverse correlation of miR-106a and ULK1 expression was seen in lung adenocarcinoma. Accordingly, ectopic expression of miR-106a in combination with Src-TKI treatment resulted in significant cell death as compared to control transduced cells. CONCLUSIONS Autophagy protects lung adenocarcinoma cells from Src-TKIs via a newly identified miR-106a-ULK1 signaling pathway. The combined inhibition of Src and ULK1/autophagy might represent a promising treatment option for future clinical trials. Lastly, our data might challenge the term "oncogenic" miR-106a as it can promote sensitivity to Src-TKIs thereby underlining the context-dependent function of miRNAs.
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Affiliation(s)
- Sacha I Rothschild
- Department of Medical Oncology, Inselspital, Bern University Hospital, Switzerland; Department of Clinical Research, University of Bern, Bern, Switzerland; Department Internal Medicine, Medical Oncology, University Hospital Basel, Basel, Switzerland
| | - Oliver Gautschi
- Department of Medical Oncology, Inselspital, Bern University Hospital, Switzerland; Medical Oncology, Cantonal Hospital, Luzern, Switzerland
| | - Jasmin Batliner
- Department of Clinical Research, University of Bern, Bern, Switzerland
| | - Mathias Gugger
- Division of Experimental Pathology, Institute of Pathology, University of Bern, Bern, Switzerland
| | - Martin F Fey
- Department of Medical Oncology, Inselspital, Bern University Hospital, Switzerland; Department of Clinical Research, University of Bern, Bern, Switzerland
| | - Mario P Tschan
- Division of Experimental Pathology, Institute of Pathology, University of Bern, Bern, Switzerland.
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Saleiro D, Kosciuczuk EM, Platanias LC. Beyond autophagy: New roles for ULK1 in immune signaling and interferon responses. Cytokine Growth Factor Rev 2016; 29:17-22. [PMID: 27068414 PMCID: PMC4899287 DOI: 10.1016/j.cytogfr.2016.03.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 03/17/2016] [Indexed: 12/16/2022]
Abstract
The human serine/threonine kinase ULK1 is the human homolog of the Caenorhabditis elegans Unc-51 kinase and of the Saccharomyces cerevisiae autophagy-related protein kinase Atg1. As Unc-51 and Atg1, ULK1 regulates both axon growth and autophagy, respectively, in mammalian cells. However, a novel immunoregulatory role of ULK1 has been recently described. This kinase was shown to be required for regulation of both type I interferon (IFN) production and induction of type I IFN signaling. Optimal regulation of IFN production is crucial for generation of effective IFN-immune responses, and defects in such networks can be detrimental for the host leading to uncontrolled pathogen infection, tumor growth, or autoimmune diseases. Thus, ULK1 plays a central role in IFN-dependent immunity. Here we review the diverse roles of ULK1, with special focus on its importance to type I IFN signaling, and highlight important future study questions.
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Affiliation(s)
- Diana Saleiro
- Robert H. Lurie Comprehensive Cancer Center and Division of Hematology-Oncology, Feinberg School of Medicine, Northwestern University, 303 East Superior Ave., Chicago, IL 60611, USA.
| | - Ewa M Kosciuczuk
- Robert H. Lurie Comprehensive Cancer Center and Division of Hematology-Oncology, Feinberg School of Medicine, Northwestern University, 303 East Superior Ave., Chicago, IL 60611, USA; Division of Hematology-Oncology, Department of Medicine, Jesse Brown Veterans Affairs Medical Center, 820 S. Damen Ave., Chicago, IL 60612, USA.
| | - Leonidas C Platanias
- Robert H. Lurie Comprehensive Cancer Center and Division of Hematology-Oncology, Feinberg School of Medicine, Northwestern University, 303 East Superior Ave., Chicago, IL 60611, USA; Division of Hematology-Oncology, Department of Medicine, Jesse Brown Veterans Affairs Medical Center, 820 S. Damen Ave., Chicago, IL 60612, USA.
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Abstract
Autophagy is a dynamic and catabolic process that results in the breakdown and recycling of cellular components through the autophagosomal-lysosomal pathway. Many autophagy genes identified in yeasts and mammals have orthologs in the nematode Caenorhabditis elegans. In recent years, gene inactivation by RNA interference (RNAi) and chromosomal mutations has been useful to probe the functions of autophagy in C. elegans, and a role for autophagy has been shown to contribute to multiple processes, such as the adaptation to stress, longevity, cell death, cell growth control, clearance of aggregation-prone proteins, degradation of P granules during embryogenesis, and apoptotic cell clearance. Here, we discuss some of these roles and describe methods that can be used to study autophagy in C. elegans. Specifically, we summarize how to visualize autophagy in embryos, larva, or adults, how to detect the lipidation of the ubiquitin-like modifier LGG-1 by western blot, and how to inactivate autophagy genes by RNAi.
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Affiliation(s)
- Nicholas J. Palmisano
- Queens College-CUNY, Department of Biology Flushing New York 11657
- The Gradate Center of the City University of New York, The City University of New York, New York USA 10016
| | - Alicia Meléndez
- Queens College-CUNY, Department of Biology Flushing New York 11657
- The Gradate Center of the City University of New York, The City University of New York, New York USA 10016
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AMPK Regulation of Cell Growth, Apoptosis, Autophagy, and Bioenergetics. EXPERIENTIA SUPPLEMENTUM (2012) 2016; 107:45-71. [PMID: 27812976 DOI: 10.1007/978-3-319-43589-3_3] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In eukaryotic cells, AMP-activated protein kinase (AMPK) generally promotes catabolic pathways that produce ATP and at the same time inhibits anabolic pathways involved in different processes that consume ATP. As an energy sensor, AMPK is involved in the main cellular functions implicated in cell fate, such as cell growth and autophagy.Recently, AMPK has been connected with apoptosis regulation, although the molecular mechanism by which AMPK induces and/or inhibits cell death is not clear.This chapter reviews the essential role of AMPK in signaling pathways that respond to cellular stress and damage, highlighting the complex and reciprocal regulation between AMPK and their targets and effectors. The therapeutic implications of the role of AMPK in different pathologies such as diabetes, cancer, or mitochondrial dysfunctions are still controversial, and it is necessary to further investigate the molecular mechanisms underlying AMPK activation.
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Wesselborg S, Stork B. Autophagy signal transduction by ATG proteins: from hierarchies to networks. Cell Mol Life Sci 2015; 72:4721-57. [PMID: 26390974 PMCID: PMC4648967 DOI: 10.1007/s00018-015-2034-8] [Citation(s) in RCA: 169] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Revised: 08/13/2015] [Accepted: 08/31/2015] [Indexed: 02/07/2023]
Abstract
Autophagy represents an intracellular degradation process which is involved in both cellular homeostasis and disease settings. In the last two decades, the molecular machinery governing this process has been characterized in detail. To date, several key factors regulating this intracellular degradation process have been identified. The so-called autophagy-related (ATG) genes and proteins are central to this process. However, several additional molecules contribute to the outcome of an autophagic response. Several review articles describing the molecular process of autophagy have been published in the recent past. In this review article we would like to add the most recent findings to this knowledge, and to give an overview of the network character of the autophagy signaling machinery.
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Affiliation(s)
- Sebastian Wesselborg
- Institute of Molecular Medicine I, Heinrich-Heine-University, Universitätsstr. 1, Building 23.12, 40225, Düsseldorf, Germany
| | - Björn Stork
- Institute of Molecular Medicine I, Heinrich-Heine-University, Universitätsstr. 1, Building 23.12, 40225, Düsseldorf, Germany.
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Abstract
During the past 20 years, autophagy signaling has entered the main stage of the cell biological theater. Autophagy represents an intracellular degradation process that is involved in both the bulk recycling of cytoplasmic components and the selective removal of organelles, protein aggregates, or intracellular pathogens. The understanding of autophagy has been greatly facilitated by the characterization of the molecular machinery governing this process. In yeast, initiation of autophagy is controlled by the Atg1 kinase complex, which is composed of the Ser/Thr kinase Atg1, the adaptor protein Atg13, and the ternary complex of Atg17-Atg31-Atg29. In vertebrates, the orthologous ULK1 kinase complex contains the Ser/Thr kinase ULK1 and the accessory proteins ATG13, RB1CC1, and ATG101. Among these components, Atg1/ULK1 have gained major attention in the past, i.e., for the identification of upstream regulatory kinases, the characterization of downstream substrates controlling the autophagic flux, or as a druggable target for the modulation of autophagy. However, accumulating data indicate that the function of Atg13/ATG13 has been likely underestimated so far. In addition to ensuring proper Atg1/ULK1 recruitment and activity, this adaptor molecule has been implicated in ULK1-independent autophagy processes. Furthermore, recent data have identified additional binding partners of Atg13/ATG13 besides the components of the Atg1/ULK1 complex, e.g., Atg8 family proteins or acidic phospholipids. Therefore, in this review we will center the spotlight on Atg13/ATG13 and summarize the role that Atg13/ATG13 assumes in the autophagy stage play.
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Affiliation(s)
- Sebastian Alers
- Institute of Molecular Medicine; Heinrich-Heine-University; Düsseldorf, Germany
| | | | - Björn Stork
- Institute of Molecular Medicine; Heinrich-Heine-University; Düsseldorf, Germany
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Surfactant toxicity in a case of (4-chloro-2-methylphenoxy) acetic acid herbicide intoxication. Hum Exp Toxicol 2014; 34:848-55. [DOI: 10.1177/0960327114559612] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objective: Self-poisoning with (4-chloro-2-methylphenoxy) acetic acid (MCPA) is a common reason for presentation to hospitals, especially in some Asian countries. We encountered a case of a 76-year-old woman who experienced unconsciousness, shock and respiratory failure after ingesting 100 mL MCPA herbicide. We determined whether the surfactant in the formulation was the chemical responsible for the toxic symptom in this patient. Design: 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) cell viability and lactate dehydrogenase (LDH) cytotoxicity assays were performed on human brain neuroblastoma SK-N-SH cells. The expressions of 84 genes in 9 categories that are implicated in cellular damage pathways were quantified using an RT2 Profiler™ PCR array on a human neuronal cell line challenged with polyoxyethylene tridecyl ether (PTE). Setting: Pesticide intoxication institute in university hospital. Interventions: Extracorporeal elimination with intravenous lipid emulsion. Measurements: Cell viability and gene expression. Main Results: In the MTT assay, MCPA only minimally decreased cell viability even at concentrations as high as 1 mM. Cells treated with 1-methoxy-2-propanol, dimethylamine and polypropylene glycol exhibited minimal decreases in viability, whilst the viability of cells challenged with PTE decreased dramatically; only 15.5% of cells survived after exposure to 1 µM PTE. Similarly, the results of the LDH cytotoxicity assay showed that MCPA had very low cytotoxicity, whilst cells treated with PTE showed incomparably higher LDH levels ( p < 0.0001). PTE up-regulated the expressions of genes implicated in various cell damage pathways, particularly genes involved in the inflammatory pathway. Conclusions: The surfactant PTE was likely the chemical responsible for the toxic symptom in our patient.
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Chen Y, He J, Tian M, Zhang SY, Guo MR, Kasimu R, Wang JH, Ouyang L. UNC51-like kinase 1, autophagic regulator and cancer therapeutic target. Cell Prolif 2014; 47:494-505. [PMID: 25327638 DOI: 10.1111/cpr.12145] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 08/12/2014] [Indexed: 02/05/2023] Open
Abstract
Autophagy, the cell process of self-digestion, plays a pivotal role in maintaining energy homoeostasis and protein synthesis. When required, it causes degradation of long-lived proteins and damaged organelles, indicating that it may play a dual role in cancer, by both protecting against and promoting cell death. The autophagy-related gene (Atg) family, with more than 35 members, regulates multiple stages of the process. Serine/threonine protein kinase Atg1 in yeast, for example, can interact with other ATG gene products, functioning in autophagosome formation. One mammalian homologue of Atg1, UNC-51-like kinase 1 (ULK1) and its related complex ULK1-mAtg13-FIP200 can mediate autophagy under nutrient-deprived conditions, by protein-protein interactions and post-translational modifications. Although specific mechanisms of how ULK1 and its complex transduces upstream signals to the downstream central autophagy pathways is not fully understood, past studies have indicated that ULK1 can both suppress and promote tumour growth under different conditions. Here, we summarize some properties of ULK1 which can regulate autophagy in cancer, which may shed new light on future cancer therapy strategies, utilizing ULK1 as a potential new target.
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Affiliation(s)
- Y Chen
- State Key Laboratory of Biotherapy & Collaborative Innovation Center of Biotherapy, Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, Chengdu, 610041, China
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The kinase triad, AMPK, mTORC1 and ULK1, maintains energy and nutrient homoeostasis. Biochem Soc Trans 2013; 41:939-43. [PMID: 23863160 DOI: 10.1042/bst20130030] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In order for cells to divide in a proficient manner, they must first double their biomass, which is considered to be the main rate-limiting phase of cell proliferation. Cell growth requires an abundance of energy and biosynthetic precursors such as lipids and amino acids. Consequently, the energy and nutrient status of the cell is acutely monitored and carefully maintained. mTORC1 [mammalian (or mechanistic) target of rapamycin complex 1] is often considered to be the master regulator of cell growth that enhances cellular biomass through up-regulation of protein translation. In order for cells to control cellular homoeostasis during growth, there is close signalling interplay between mTORC1 and two other protein kinases, AMPK (AMP-activated protein kinase) and ULK1 (Unc-51-like kinase 1). This kinase triad collectively senses the energy and nutrient status of the cell and appropriately dictates whether the cell will actively favour energy- and amino-acid-consuming anabolic processes such as cellular growth, or energy- and amino-acid-generating catabolic processes such as autophagy. The present review discusses important feedback mechanisms between these three homoeostatic protein kinases that orchestrate cell growth and autophagy, with a particular focus on the mTORC1 component raptor (regulatory associated protein of mammalian target of rapamycin), as well as the autophagy-initiating kinase ULK1.
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Chong ZZ, Yao Q, Li HH. The rationale of targeting mammalian target of rapamycin for ischemic stroke. Cell Signal 2013; 25:1598-607. [PMID: 23563259 DOI: 10.1016/j.cellsig.2013.03.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Accepted: 03/28/2013] [Indexed: 02/06/2023]
Abstract
Given the current limitation of therapeutic approach for ischemic stroke, a leading cause of disability and mortality in the developed countries, to develop new therapeutic strategies for this devastating disease is urgently necessary. As a serine/threonine kinase, mammalian target of rapamycin (mTOR) activation can mediate broad biological activities that include protein synthesis, cytoskeleton organization, and cell survival. mTOR functions through mTORC1 and mTORC2 complexes and their multiple downstream substrates, such as eukaryotic initiation factor 4E-binding protein 1, p70 ribosomal S6 kinase, sterol regulatory element-binding protein 1, hypoxia inducible factor-1, and signal transducer and activator transcription 3, Yin Ying 1, Akt, protein kinase c-alpha, Rho GTPase, serum-and gucocorticoid-induced protein kinase 1, etc. Specially, the role of mTOR in the central nervous system has been attracting considerable attention. Based on the ability of mTOR to prevent neuronal apoptosis, inhibit autophagic cell death, promote neurogenesis, and improve angiogenesis, mTOR may acquire the capability of limiting the ischemic neuronal death and promoting the neurological recovery. Consequently, to regulate the activity of mTOR holds a potential as a novel therapeutic strategy for ischemic stroke.
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Affiliation(s)
- Zhao Zhong Chong
- Department of Neurology and Neurosciences, Cancer Center, New Jersey Medical School, University of Medicine and Dentistry of New Jersey, Newark, NJ 07101, USA.
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48
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McAlpine F, Williamson LE, Tooze SA, Chan EY. Regulation of nutrient-sensitive autophagy by uncoordinated 51-like kinases 1 and 2. Autophagy 2013; 9:361-73. [PMID: 23291478 PMCID: PMC3590256 DOI: 10.4161/auto.23066] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Macroautophagy, commonly referred to as autophagy, is a protein degradation pathway that occurs constitutively in cells, but can also be induced by stressors such as nutrient starvation or protein aggregation. Autophagy has been implicated in multiple disease mechanisms including neurodegeneration and cancer, with both tumor suppressive and oncogenic roles. Uncoordinated 51-like kinase 1 (ULK1) is a critical autophagy protein near the apex of the hierarchal regulatory pathway that receives signals from the master nutrient sensors MTOR and AMP-activated protein kinase (AMPK). In mammals, ULK1 has a close homolog, ULK2, although their functional distinctions have been unclear. Here, we show that ULK1 and ULK2 both function to support autophagy activation following nutrient starvation. Increased autophagy following amino acid or glucose starvation was disrupted only upon combined loss of ULK1 and ULK2 in mouse embryonic fibroblasts. Generation of PtdIns3P and recruitment of WIPI2 or ZFYVE1/DFCP1 to the phagophore following amino acid starvation was blocked by combined Ulk1/2 double knockout. Autophagy activation following glucose starvation did not involve recruitment of either WIPI1 or WIPI2 to forming autophagosomes. Consistent with a PtdIns3P-independent mechanism, glucose-dependent autophagy was resistant to wortmannin. Our findings support functional redundancy between ULK1 and ULK2 for nutrient-dependent activation of autophagy and furthermore highlight the differential pathways that respond to amino acid and glucose deprivation.
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Affiliation(s)
- Fiona McAlpine
- London Research Institute; Cancer Research UK; Secretory Pathways Laboratory; London, UK
| | - Leon E. Williamson
- Strathclyde Institute of Pharmacy and Biomedical Sciences; RICAS Group; University of Strathclyde; Glasgow, Scotland
| | - Sharon A. Tooze
- London Research Institute; Cancer Research UK; Secretory Pathways Laboratory; London, UK
| | - Edmond Y.W. Chan
- Strathclyde Institute of Pharmacy and Biomedical Sciences; RICAS Group; University of Strathclyde; Glasgow, Scotland
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Wong PM, Puente C, Ganley IG, Jiang X. The ULK1 complex: sensing nutrient signals for autophagy activation. Autophagy 2013; 9:124-37. [PMID: 23295650 PMCID: PMC3552878 DOI: 10.4161/auto.23323] [Citation(s) in RCA: 368] [Impact Index Per Article: 33.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The Atg1/ULK1 complex plays a central role in starvation-induced autophagy, integrating signals from upstream sensors such as MTOR and AMPK and transducing them to the downstream autophagy pathway. Much progress has been made in the last few years in understanding the mechanisms by which the complex is regulated through protein-protein interactions and post-translational modifications, providing insights into how the cell modulates autophagy, particularly in response to nutrient status. However, how the ULK1 complex transduces upstream signals to the downstream central autophagy pathway is still unclear. Although the protein kinase activity of ULK1 is required for its autophagic function, its protein substrate(s) responsible for autophagy activation has not been identified. Furthermore, examples of potential ULK1-independent autophagy have emerged, indicating that under certain specific contexts, the ULK1 complex might be dispensable for autophagy activation. This raises the question of how the autophagic machinery is activated independent of the ULK1 complex and what are the biological functions of such noncanonical autophagy pathways.
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Affiliation(s)
- Pui-Mun Wong
- Cell Biology Program; Memorial Sloan-Kettering Cancer Center; New York, NY USA
| | - Cindy Puente
- Cell Biology Program; Memorial Sloan-Kettering Cancer Center; New York, NY USA
| | - Ian G. Ganley
- MRC Protein Phosphorylation Unit; University of Dundee; Dundee, Scotland UK
| | - Xuejun Jiang
- Cell Biology Program; Memorial Sloan-Kettering Cancer Center; New York, NY USA
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50
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Chong ZZ, Shang YC, Wang S, Maiese K. Shedding new light on neurodegenerative diseases through the mammalian target of rapamycin. Prog Neurobiol 2012; 99:128-48. [PMID: 22980037 PMCID: PMC3479314 DOI: 10.1016/j.pneurobio.2012.08.001] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 08/01/2012] [Accepted: 08/07/2012] [Indexed: 12/13/2022]
Abstract
Neurodegenerative disorders affect a significant portion of the world's population leading to either disability or death for almost 30 million individuals worldwide. One novel therapeutic target that may offer promise for multiple disease entities that involve Alzheimer's disease, Parkinson's disease, epilepsy, trauma, stroke, and tumors of the nervous system is the mammalian target of rapamycin (mTOR). mTOR signaling is dependent upon the mTORC1 and mTORC2 complexes that are composed of mTOR and several regulatory proteins including the tuberous sclerosis complex (TSC1, hamartin/TSC2, tuberin). Through a number of integrated cell signaling pathways that involve those of mTORC1 and mTORC2 as well as more novel signaling tied to cytokines, Wnt, and forkhead, mTOR can foster stem cellular proliferation, tissue repair and longevity, and synaptic growth by modulating mechanisms that foster both apoptosis and autophagy. Yet, mTOR through its proliferative capacity may sometimes be detrimental to central nervous system recovery and even promote tumorigenesis. Further knowledge of mTOR and the critical pathways governed by this serine/threonine protein kinase can bring new light for neurodegeneration and other related diseases that currently require new and robust treatments.
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Affiliation(s)
- Zhao Zhong Chong
- Laboratory of Cellular and Molecular Signaling, New Jersey 07101
- New Jersey Health Sciences University Newark, New Jersey 07101
| | - Yan Chen Shang
- Laboratory of Cellular and Molecular Signaling, New Jersey 07101
- New Jersey Health Sciences University Newark, New Jersey 07101
| | - Shaohui Wang
- Laboratory of Cellular and Molecular Signaling, New Jersey 07101
- New Jersey Health Sciences University Newark, New Jersey 07101
| | - Kenneth Maiese
- Laboratory of Cellular and Molecular Signaling, New Jersey 07101
- Cancer Institute of New Jersey, New Jersey 07101
- New Jersey Health Sciences University Newark, New Jersey 07101
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