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Wei W, Zeng Q, Wang Y, Guo X, Fan T, Li Y, Deng H, Zhao L, Zhang X, Liu Y, Shi Y, Zhu J, Ma X, Wang Y, Jiang J, Song D. Discovery and identification of EIF2AK2 as a direct key target of berberine for anti-inflammatory effects. Acta Pharm Sin B 2023; 13:2138-2151. [PMID: 37250154 PMCID: PMC10213791 DOI: 10.1016/j.apsb.2022.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 11/05/2022] [Accepted: 12/06/2022] [Indexed: 12/23/2022] Open
Abstract
Using chemoproteomic techniques, we first identified EIF2AK2, eEF1A1, PRDX3 and VPS4B as direct targets of berberine (BBR) for its synergistically anti-inflammatory effects. Of them, BBR has the strongest affinity with EIF2AK2 via two ionic bonds, and regulates several key inflammatory pathways through EIF2AK2, indicating the dominant role of EIF2AK2. Also, BBR could subtly inhibit the dimerization of EIF2AK2, rather than its enzyme activity, to selectively modulate its downstream pathways including JNK, NF-κB, AKT and NLRP3, with an advantage of good safety profile. In EIF2AK2 gene knockdown mice, the inhibitory IL-1β, IL-6, IL-18 and TNF-α secretion of BBR was obviously attenuated, confirming an EIF2AK2-dependent anti-inflammatory efficacy. The results highlight the BBR's network mechanism on anti-inflammatory effects in which EIF2AK2 is a key target, and inhibition of EIF2AK2 dimerization has a potential to be a therapeutic strategy against inflammation-related disorders.
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Affiliation(s)
| | | | | | - Xixi Guo
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Tianyun Fan
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Yinghong Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Hongbin Deng
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Liping Zhao
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Xintong Zhang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Yonghua Liu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Yulong Shi
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Jingyang Zhu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Xican Ma
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Yanxiang Wang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Jiandong Jiang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Danqing Song
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
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2
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Macintosh J, Thiffault I, Pastinen T, Sztriha L, Bernard G. A Recurrent De Novo Variant in EIF2AK2 Causes a Hypomyelinating Leukodystrophy. Child Neurol Open 2023; 10:2329048X231176673. [PMID: 37284702 PMCID: PMC10240855 DOI: 10.1177/2329048x231176673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 03/29/2023] [Accepted: 05/01/2023] [Indexed: 06/08/2023] Open
Abstract
De novo pathogenic variants in EIF2AK2 have recently been reported as a novel genetic cause of leukoencephalopathy. Here, we describe a male individual who presented in the first year of life with clinical features resembling Pelizaeus-Merzbacher disease (PMD), including nystagmus, hypotonia, and global developmental delay, and which later progressed to include ataxia and spasticity. Brain MRI at the age of two revealed diffuse hypomyelination. This report adds to the limited number of individuals published and further reinforces de novo variants in EIF2AK2 as a molecular cause of a leukodystrophy that clinically and radiologically resembles PMD.
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Affiliation(s)
- Julia Macintosh
- Department of Neurology and Neurosurgery, McGill University, Montreal, QC, Canada
- Child Health and Human Development Program, Research Institute of the McGill University Health Center, Montreal, QC, Canada
| | - Isabelle Thiffault
- Genomic Medicine Center, Children’s Mercy Hospital, Kansas City, MO, USA
- University of Missouri Kansas City School of Medicine, Kansas City, MO, USA
- Department of Pathology and Laboratory Medicine, Children's Mercy Hospital, Kansas City, MO, USA
| | - Tomi Pastinen
- Genomic Medicine Center, Children’s Mercy Hospital, Kansas City, MO, USA
- University of Missouri Kansas City School of Medicine, Kansas City, MO, USA
- Department of Pediatrics, Children's Mercy Hospital, Kansas City, MO, USA
| | - László Sztriha
- Department of Pediatrics Szent-Györgyi Albert Medical Center, University of Szeged, Szeged, Hungary
| | - Geneviève Bernard
- Department of Neurology and Neurosurgery, McGill University, Montreal, QC, Canada
- Child Health and Human Development Program, Research Institute of the McGill University Health Center, Montreal, QC, Canada
- Department Specialized Medicine, Division of Medical Genetics, McGill University Health Center, Montreal, QC, Canada
- Department of Pediatrics, McGill University, Montreal, QC, Canada
- Department of Human Genetics, McGill University, Montreal, QC, Canada
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3
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Hu YM, Ran R, Yang C, Liu SM. The diagnostic and prognostic implications of PRKRA expression in HBV-related hepatocellular carcinoma. Infect Agent Cancer 2022; 17:34. [PMID: 35729579 PMCID: PMC9211784 DOI: 10.1186/s13027-022-00430-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 04/08/2022] [Indexed: 11/24/2022] Open
Abstract
Background Hepatitis B virus (HBV)-related hepatocellular carcinoma (HCC) accounts for more than half of total HCC patients in developing countries. Currently, HBV-related HCC diagnosis and prognosis still lack specific biomarkers. Here, we investigated if PRKRA expression in peripheral blood could be a potential biomarker for the diagnosis/prognosis of HBV-related HCC. Methods The expression of PRKRA in HBV-related HCC was firstly analyzed using TCGA and GEO databases. The results were confirmed in a validation cohort including 152 blood samples from 77 healthy controls and 75 HCC patients, 60 of which were infected with HBV. The potential diagnostic and prognostic values of PRKRA were also evaluated by the area under the receiver operator characteristic curve (AUROC) and Kaplan–Meier method, respectively. Results PRKRA was significantly upregulated in HCC patients, especially in those with HBV infections. In addition, the combination of PRKRA expression in peripheral blood with serum AFP and CEA levels displayed a better diagnostic performance (AUROC = 0.908, 95% CI 0.844–0.972; p < 0.001). Notably, when serum AFP is less than 200 ng/mL, PRKRA expression demonstrated better diagnostic capability. Furthermore, PRKRA expression levels were associated with expression of EIF2AK2 and inflammatory cytokine genes. Conclusions Triple combination testing of blood PRKRA expression, serum AFP and CEA levels could be a noninvasive strategy for diagnosis; and the elevation of PRKRA expression could predicate poor prognosis for HBV-related HCC. Supplementary Information The online version contains supplementary material available at 10.1186/s13027-022-00430-6.
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Affiliation(s)
- Yi-Min Hu
- Department of Clinical Laboratory, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, 410005, China
| | - Ruoxi Ran
- Department of Clinical Laboratory, Center for Gene Diagnosis, and Program of Clinical Laboratory Medicine, Zhongnan Hospital of Wuhan University, 169 Donghu Road, Wuhan, 430071, Hubei, China
| | - Chaoqi Yang
- Department of Clinical Laboratory, Center for Gene Diagnosis, and Program of Clinical Laboratory Medicine, Zhongnan Hospital of Wuhan University, 169 Donghu Road, Wuhan, 430071, Hubei, China
| | - Song-Mei Liu
- Department of Clinical Laboratory, Center for Gene Diagnosis, and Program of Clinical Laboratory Medicine, Zhongnan Hospital of Wuhan University, 169 Donghu Road, Wuhan, 430071, Hubei, China.
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4
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Magrinelli F, Moualek D, Tazir M, Pacha LA, Verghese A, Bhatia KP, Maroofian R, Houlden H. Heterozygous EIF2AK2 Variant Causes Adolescence-Onset Generalized Dystonia Partially Responsive to DBS. Mov Disord Clin Pract 2022; 9:268-271. [PMID: 35146068 PMCID: PMC8810423 DOI: 10.1002/mdc3.13371] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 10/27/2021] [Accepted: 11/04/2021] [Indexed: 11/08/2022] Open
Affiliation(s)
- Francesca Magrinelli
- Department of Clinical and Movement NeurosciencesUCL Queen Square Institute of Neurology, University College LondonLondonUnited Kingdom
- Department of NeurosciencesBiomedicine and Movement Sciences, University of VeronaVeronaItaly
| | - Dalila Moualek
- Service de NeurologieCHU Mustapha BachaAlgerAlgeria
- Laboratoire de Recherche en NeurosciencesUniversité Benyoucef BenkheddaAlgerAlgeria
| | - Meriem Tazir
- Service de NeurologieCHU Mustapha BachaAlgerAlgeria
- Laboratoire de Recherche en NeurosciencesUniversité Benyoucef BenkheddaAlgerAlgeria
| | - Lamia Ali Pacha
- Service de NeurologieCHU Mustapha BachaAlgerAlgeria
- Laboratoire de Recherche en NeurosciencesUniversité Benyoucef BenkheddaAlgerAlgeria
| | - Alice Verghese
- Department of Clinical and Movement NeurosciencesUCL Queen Square Institute of Neurology, University College LondonLondonUnited Kingdom
| | - Kailash P. Bhatia
- Department of Clinical and Movement NeurosciencesUCL Queen Square Institute of Neurology, University College LondonLondonUnited Kingdom
| | - Reza Maroofian
- Department of Neuromuscular DiseasesUCL Queen Square Institute of Neurology, University College LondonLondonUnited Kingdom
| | - Henry Houlden
- Department of Neuromuscular DiseasesUCL Queen Square Institute of Neurology, University College LondonLondonUnited Kingdom
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5
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Abstract
The global antimicrobial resistance crisis poses a significant threat to humankind in the coming decades. Challenges associated with the development of novel antibiotics underscore the urgent need to develop alternative treatment strategies to combat bacterial infections. Host-directed therapy is a promising new therapeutic strategy that aims to boost the host immune response to bacteria rather than target the pathogen itself, thereby circumventing the development of antibiotic resistance. However, host-directed therapy depends on the identification of druggable host targets or proteins with key functions in antibacterial defense. Protein Kinase R (PKR) is a well-characterized human kinase with established roles in cancer, metabolic disorders, neurodegeneration, and antiviral defense. However, its role in antibacterial defense has been surprisingly underappreciated. Although the canonical role of PKR is to inhibit protein translation during viral infection, this kinase senses and responds to multiple types of cellular stress by regulating cell-signaling pathways involved in inflammation, cell death, and autophagy – mechanisms that are all critical for a protective host response against bacterial pathogens. Indeed, there is accumulating evidence to demonstrate that PKR contributes significantly to the immune response to a variety of bacterial pathogens. Importantly, there are existing pharmacological modulators of PKR that are well-tolerated in animals, indicating that PKR is a feasible target for host-directed therapy. In this review, we provide an overview of immune cell functions regulated by PKR and summarize the current knowledge on the role and functions of PKR in bacterial infections. We also review the non-canonical activators of PKR and speculate on the potential mechanisms that trigger activation of PKR during bacterial infection. Finally, we provide an overview of existing pharmacological modulators of PKR that could be explored as novel treatment strategies for bacterial infections.
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Affiliation(s)
- Robin Smyth
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada
| | - Jim Sun
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada.,Centre for Infection, Immunity and Inflammation, University of Ottawa, Ottawa, ON, Canada
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6
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Chang J, Hwang HJ, Kim B, Choi YG, Park J, Park Y, Lee BS, Park H, Yoon MJ, Woo JS, Kim C, Park MS, Lee JB, Kim YK. TRIM28 functions as a negative regulator of aggresome formation. Autophagy 2021; 17:4231-4248. [PMID: 33783327 DOI: 10.1080/15548627.2021.1909835] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Selective recognition and elimination of misfolded polypeptides are crucial for protein homeostasis. When the ubiquitin-proteasome system is impaired, misfolded polypeptides tend to form small cytosolic aggregates and are transported to the aggresome and eventually eliminated by the autophagy pathway. Despite the importance of this process, the regulation of aggresome formation remains poorly understood. Here, we identify TRIM28/TIF1β/KAP1 (tripartite motif containing 28) as a negative regulator of aggresome formation. Direct interaction between TRIM28 and CTIF (cap binding complex dependent translation initiation factor) leads to inefficient aggresomal targeting of misfolded polypeptides. We also find that either treatment of cells with poly I:C or infection of the cells by influenza A viruses triggers the phosphorylation of TRIM28 at S473 in a way that depends on double-stranded RNA-activated protein kinase. The phosphorylation promotes association of TRIM28 with CTIF, inhibits aggresome formation, and consequently suppresses viral proliferation. Collectively, our data provide compelling evidence that TRIM28 is a negative regulator of aggresome formation.AbbreviationsBAG3: BCL2-associated athanogene 3; CTIF: CBC-dependent translation initiation factor; CED: CTIF-EEF1A1-DCTN1; DCTN1: dynactin subunit 1; EEF1A1: eukaryotic translation elongation factor 1 alpha 1; EIF2AK2: eukaryotic translation initiation factor 2 alpha kinase 2; HDAC6: histone deacetylase 6; IAV: influenza A virus; IP: immunoprecipitation; PLA: proximity ligation assay; polypeptidyl-puro: polypeptidyl-puromycin; qRT-PCR: quantitative reverse-transcription PCR; siRNA: small interfering RNA.
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Affiliation(s)
- Jeeyoon Chang
- Creative Research Initiatives Center for Molecular Biology of Translation, Korea University, Seoul, Republic of Korea.,Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Hyun Jung Hwang
- Creative Research Initiatives Center for Molecular Biology of Translation, Korea University, Seoul, Republic of Korea.,Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Byungju Kim
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Yeon-Gil Choi
- Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Joori Park
- Creative Research Initiatives Center for Molecular Biology of Translation, Korea University, Seoul, Republic of Korea.,Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Yeonkyoung Park
- Creative Research Initiatives Center for Molecular Biology of Translation, Korea University, Seoul, Republic of Korea.,Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Ban Seok Lee
- Creative Research Initiatives Center for Molecular Biology of Translation, Korea University, Seoul, Republic of Korea.,Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Heedo Park
- Department of Microbiology, Institute for Viral Diseases, College of Medicine, Korea University, Seoul, 02841, Republic of Korea
| | - Min Ji Yoon
- Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Jae-Sung Woo
- Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Chungho Kim
- Division of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Man-Seong Park
- Department of Microbiology, Institute for Viral Diseases, College of Medicine, Korea University, Seoul, 02841, Republic of Korea
| | - Jong-Bong Lee
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.,School of Interdisciplinary Bioscience and Bioengineering, POSTECH, Pohang, 37673, Republic of Korea
| | - Yoon Ki Kim
- Creative Research Initiatives Center for Molecular Biology of Translation, Korea University, Seoul, Republic of Korea.,Division of Life Sciences, Korea University, Seoul, Republic of Korea
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7
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Ge L, Zhang Y, Zhao X, Wang J, Zhang Y, Wang Q, Yu H, Zhang Y, You Y. EIF2AK2 selectively regulates the gene transcription in immune response and histones associated with systemic lupus erythematosus. Mol Immunol 2021; 132:132-141. [PMID: 33588244 DOI: 10.1016/j.molimm.2021.01.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 01/21/2021] [Accepted: 01/28/2021] [Indexed: 12/13/2022]
Abstract
PKR, also known as EIF2AK2, is an IFN-stimulated gene (ISG) and shows a higher expression in probands with systemic lupus erythematosus (SLE), which is likely responsible for the impaired translational and proliferative responses to mitogens in T cells from SLE patients. In this study, we overexpressed EIF2AK2 in HeLa cells to study EIF2AK2-regulated genes using RNA-seq technology, followed by bioinformatic analysis of target genes of EIF2AK2-regulated transcriptional factors (TFs). Overexpression of EIF2AK2 promotes HeLa cell apoptosis. EIF2AK2 selectively represses the transcription of histone protein genes associated with SLE, immune response genes and TF genes, which was validated by RT-qPCR experiments. Analysis of motifs overrepresented in the promoter regions of EIF2AK2-regulated genes revealed eighteen EIF2AK2-regulated TFs involved in establishing the EIF2AK2 network. Eight out of these predicted EIF2AK2-regulated TFs were further verified by RT-qPCR selectively in both HeLa and Jurkat cells, and most such as HEY2, TFEC, BATF2, GATA3 and ATF3 and FOXO6 are known to regulate immune response. Our results suggest that the dsRNA-dependent kinase EIF2AK2 selectively regulates the transcription of immune response and SLE-associated histone protein genes, and such a selectivity is likely to be operated by EIF2AK2-targeted TFs. The EIF2AK2-TFs axis potentially offers new therapeutic targets for counteracting immunological disease in the future.
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Affiliation(s)
- Lan Ge
- Department of Dermatology, Southwest Hospital, Third Military Medical University(Army Medical University), Chongqing, 400038, China.
| | - Yuhong Zhang
- Laboratory of Human Health and Genome Regulation, ABLife Inc., Wuhan, Hubei 430075, China; Center for Genome Analysis, ABLife Inc., Wuhan, Hubei 430075, China.
| | - Xingwang Zhao
- Department of Dermatology, Southwest Hospital, Third Military Medical University(Army Medical University), Chongqing, 400038, China.
| | - Juan Wang
- Department of Dermatology, Southwest Hospital, Third Military Medical University(Army Medical University), Chongqing, 400038, China.
| | - Yu Zhang
- Center for Genome Analysis, ABLife Inc., Wuhan, Hubei 430075, China.
| | - Qi Wang
- Center for Genome Analysis, ABLife Inc., Wuhan, Hubei 430075, China.
| | - Han Yu
- Laboratory of Human Health and Genome Regulation, ABLife Inc., Wuhan, Hubei 430075, China.
| | - Yi Zhang
- Laboratory of Human Health and Genome Regulation, ABLife Inc., Wuhan, Hubei 430075, China; Center for Genome Analysis, ABLife Inc., Wuhan, Hubei 430075, China.
| | - Yi You
- Department of Dermatology, Southwest Hospital, Third Military Medical University(Army Medical University), Chongqing, 400038, China.
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8
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Reimer L, Vesterager LB, Betzer C, Zheng J, Nielsen LD, Kofoed RH, Lassen LB, Bølcho U, Paludan SR, Fog K, Jensen PH. Inflammation kinase PKR phosphorylates α-synuclein and causes α-synuclein-dependent cell death. Neurobiol Dis 2018; 115:17-28. [PMID: 29501855 DOI: 10.1016/j.nbd.2018.03.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 02/26/2018] [Accepted: 03/01/2018] [Indexed: 01/18/2023] Open
Abstract
Parkinson's disease, dementia with Lewy bodies, and multiple system atrophy comprise a group of neurodegenerative diseases termed synucleinopathies. Synucleinopathie are, characterized by presence of inclusion bodies in degenerating brain cells which contain aggregated α-synuclein phosphorylated on Ser129. Although the inflammation-associated serine-threonine kinase, PKR (EIF2AK2), promotes cellular protection against infection, we demonstrate a pro-degenerative role of activated PKR in an α-synuclein-dependent cell model of multiple system atrophy, where inhibition and silencing of PKR decrease cellular degeneration. In vitro phosphorylation demonstrates that PKR can directly bind and phosphorylate monomeric and filamenteous α-synuclein on Ser129. Inhibition and knockdown of PKR reduce Ser129 phosphorylation in different models (SH-SY5Y ASYN cells, OLN-AS7 cells, primary mouse hippocampal neurons, and acute brain slices), while overexpression of constitutively active PKR increases Ser129 α-syn phosphorylation. Treatment with pre-formed α-synuclein fibrils, proteostatic stress-promoting MG-132 and known PKR activators, herpes simplex virus-1-∆ICP34.5 and LPS, as well as PKR inducer, IFN-β-1b, lead to increased levels of phosphorylated Ser129 α-synuclein that is completely blocked by simultaneous PKR inhibition. These results reveal a direct link between PKR and the phosphorylation and toxicity of α-synuclein, and they support that neuroinflammatory processes play a role in modulating the pathogenicity of α-synuclein.
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Affiliation(s)
- Lasse Reimer
- Danish Research Institute of Translational Neuroscience - DANDRITE, Aarhus University, Denmark; Department of Biomedicine, Aarhus University, Denmark.
| | | | - Cristine Betzer
- Danish Research Institute of Translational Neuroscience - DANDRITE, Aarhus University, Denmark; Department of Biomedicine, Aarhus University, Denmark
| | - Jin Zheng
- Danish Research Institute of Translational Neuroscience - DANDRITE, Aarhus University, Denmark; Department of Biomedicine, Aarhus University, Denmark
| | - Lærke Dalsgaard Nielsen
- Danish Research Institute of Translational Neuroscience - DANDRITE, Aarhus University, Denmark; Department of Biomedicine, Aarhus University, Denmark
| | - Rikke Hahn Kofoed
- Danish Research Institute of Translational Neuroscience - DANDRITE, Aarhus University, Denmark; Department of Biomedicine, Aarhus University, Denmark
| | - Louise Berkhoudt Lassen
- Danish Research Institute of Translational Neuroscience - DANDRITE, Aarhus University, Denmark; Department of Biomedicine, Aarhus University, Denmark
| | - Ulrik Bølcho
- Danish Research Institute of Translational Neuroscience - DANDRITE, Aarhus University, Denmark; Department of Biomedicine, Aarhus University, Denmark
| | | | | | - Poul Henning Jensen
- Danish Research Institute of Translational Neuroscience - DANDRITE, Aarhus University, Denmark; Department of Biomedicine, Aarhus University, Denmark
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9
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Barage S, Kulkarni A, Pal JK, Joshi M. Unravelling the structural interactions between PKR kinase domain and its small molecule inhibitors using computational approaches. J Mol Graph Model 2017. [PMID: 28628858 DOI: 10.1016/j.jmgm.2017.06.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The RNA-dependent protein kinase (PKR), an eIF2α kinase plays an important role in anti-viral response, apoptosis and cell survival. It is also implicated to play a role in several cancers, metabolic and neurodegenerative disorders. A few ATP competitive inhibitors of the PKR have been reported in the literature with promising results in vitro and in vivo. The aim of this study was to unravel the structural interactions between these inhibitors and the PKR kinase domain using molecular simulations and docking. Our study reveals that the reported inhibitors bind in the adenine pocket and form hydrogen bonds with the hinge region and vdW interactions with non-polar residues in the binding site. The most potent inhibitor has several favorable interactions with the binding site and induces the P-loop to fold inward, creating a significant hydrophobic enclosure for itself. The computed binding free energies of these inhibitors are in accord with experimental data (IC50). Strategies to design potent and selective PKR inhibitors are discussed to overcome the reported promiscuity.
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Affiliation(s)
- Sagar Barage
- Bioinformatics Centre, S. P. Pune University, Pune 411007, India
| | | | - Jayanta K Pal
- Department of Biotechnology, S. P. Pune University, Pune 411007, India; Dr. D.Y. Patil Biotechnology & Bioinformatics Institute, Dr. D.Y. Patil Vidyapeeth, Tathawade, Pune 411033, India
| | - Manali Joshi
- Bioinformatics Centre, S. P. Pune University, Pune 411007, India.
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10
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Wan D, Wang X, Wu Q, Lin P, Pan Y, Sattar A, Huang L, Ahmad I, Zhang Y, Yuan Z. Integrated Transcriptional and Proteomic Analysis of Growth Hormone Suppression Mediated by Trichothecene T-2 Toxin in Rat GH3 Cells. Toxicol Sci 2015; 147:326-38. [PMID: 26141394 DOI: 10.1093/toxsci/kfv131] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023] Open
Abstract
Chronic exposure to trichothecenes is known to disturb insulin-like growth factor 1 and signaling of insulin and leptin hormones and causes considerable growth retardation in animals. However, limited information was available on mechanisms underlying trichothecene-induced growth retardation. In this study, we employed an integrated transcriptomics, proteomics, and RNA interference (RNAi) approach to study the molecular mechanisms underlying trichothecene cytotoxicity in rat pituitary adenoma GH3 cells. Our results showed that trichothecenes suppressed the synthesis of growth hormone 1 (Gh1) and inhibited the eukaryotic transcription and translation initiation by suppressing aminoacyl-tRNA synthetases transcription, inducing eukaryotic translation initiation factor 2-alpha kinase 2 (EIF2AK2) and reducing eukaryotic translation initiation factor 5 a. The sulfhydryl oxidases , protein disulfide isomerase,and heat shock protein 90 (were greatly reduced, which resulted in adverse regulation of protein processing and folding. Differential genes and proteins associated with a decline in energy metabolism and cell cycle arrest were also found in our study. However, use of RNAi to interfere with hemopoietic cell kinase (Hck) and EIF2AK2 transcriptions or use of chemical inhibitors of MAPK, p38, Ras, and JNK partially reversed the reduction of Gh1 levels induced by trichothecenes. It indicated that the activation of MAPKs, Hck, and EIF2AK2 were important for trichothecene-induced growth hormone suppression. Considering the potential hazards of exposure to trichothecenes, our findings could help to improve our understanding regarding human and animal health implications.
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Affiliation(s)
- Dan Wan
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China; Research Center of Healthy Livestock Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China
| | - Xu Wang
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Qinghua Wu
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; College of Life Science, Yangtze University, Jingzhou, Hubei, China; and Center for Basic and Applied Research, Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | - Pingping Lin
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Yuanhu Pan
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Adeel Sattar
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Lingli Huang
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University
| | - Ijaz Ahmad
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Yuanyuan Zhang
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University
| | - Zonghui Yuan
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China;
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