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Gong F, Liu W, Pei L, Wang X, Zheng X, Yang S, Zhao S, Xu D, Li R, Yang Z, Mao E, Chen E, Chen Y. Dissecting the mediating role of inflammatory factors in the interaction between metabolites and sepsis: insights from bidirectional Mendelian randomization. Front Endocrinol (Lausanne) 2024; 15:1377755. [PMID: 39205680 PMCID: PMC11351091 DOI: 10.3389/fendo.2024.1377755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Accepted: 07/15/2024] [Indexed: 09/04/2024] Open
Abstract
Sepsis, a life-threatening condition, involves complex interactions among metabolic alterations, inflammatory mediators, and host responses. This study utilized a bidirectional Mendelian randomization approach to investigate the causal relationships between 1400 metabolites and sepsis, and the mediating role of inflammatory factors. We identified 36 metabolites significantly associated with sepsis (p < 0.05), with AXIN1, FGF-19, FGF-23, IL-4, and OSM showing an inverse association, suggesting a protective role, while IL-2 exhibited a positive correlation, indicating a potential risk factor. Among these metabolites, Piperine and 9-Hydroxystearate demonstrated particularly interesting protective effects against sepsis. Piperine's protective effect was mediated through its interaction with AXIN1, contributing to a 16.296% reduction in sepsis risk. This suggests a potential pathway where Piperine influences sepsis outcomes by modulating AXIN1 levels. 9-Hydroxystearate also exhibited a protective role against sepsis, mediated through its positive association with FGF-19 and negative association with IL-2, contributing 9.436% and 12.565%, respectively, to its protective effect. Experimental validation confirmed significantly elevated IL-2 levels and reduced FGF-19, AXIN1, piperine, and 9-hydroxyoctadecanoic acid levels in sepsis patients compared to healthy controls. Piperine levels positively correlated with AXIN1, while 9-hydroxyoctadecanoic acid levels negatively correlated with IL-2 and positively correlated with FGF-19, supporting the Mendelian randomization findings. Our findings provide insights into the molecular mechanisms of sepsis, highlighting the unique roles and contributions of specific metabolites and their interactions with inflammatory mediators. This study enhances our understanding of sepsis pathophysiology and opens avenues for targeted therapeutic interventions and biomarker development for sepsis management. However, further research is essential to validate these pathways across diverse populations and fully explore the roles of these metabolites in sepsis.
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Affiliation(s)
- Fangchen Gong
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wenbin Liu
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Lei Pei
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaofeng Wang
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiangtao Zheng
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Song Yang
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shanzhi Zhao
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Dan Xu
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ranran Li
- Department of Critical Care Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhitao Yang
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Enqiang Mao
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Erzhen Chen
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ying Chen
- Department of Emergency, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Gross A, Müller J, Chrustowicz J, Strasser A, Gottemukkala KV, Sherpa D, Schulman BA, Murray PJ, Alpi AF. Skraban-Deardorff intellectual disability syndrome-associated mutations in WDR26 impair CTLH E3 complex assembly. FEBS Lett 2024; 598:978-994. [PMID: 38575527 DOI: 10.1002/1873-3468.14866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 03/07/2024] [Accepted: 03/11/2024] [Indexed: 04/06/2024]
Abstract
Patients with Skraban-Deardorff syndrome (SKDEAS), a neurodevelopmental syndrome associated with a spectrum of developmental and intellectual delays and disabilities, harbor diverse mutations in WDR26, encoding a subunit of the multiprotein CTLH E3 ubiquitin ligase complex. Structural studies revealed that homodimers of WDR26 bridge two core-CTLH E3 complexes to generate giant, hollow oval-shaped supramolecular CTLH E3 assemblies. Additionally, WDR26 mediates CTLH E3 complex binding to subunit YPEL5 and functions as substrate receptor for the transcriptional repressor HBP1. Here, we mapped SKDEAS-associated mutations on a WDR26 structural model and tested their functionality in complementation studies using genetically engineered human cells lacking CTLH E3 supramolecular assemblies. Despite the diversity of mutations, 15 of 16 tested mutants impaired at least one CTLH E3 complex function contributing to complex assembly and interactions, thus providing first mechanistic insights into SKDEAS pathology.
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Affiliation(s)
- Annette Gross
- Immunoregulation Research Group, Max Planck Institute of Biochemistry, Martinsried, Germany
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Judith Müller
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Jakub Chrustowicz
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Alexander Strasser
- Immunoregulation Research Group, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Karthik V Gottemukkala
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Dawafuti Sherpa
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Brenda A Schulman
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Peter J Murray
- Immunoregulation Research Group, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Arno F Alpi
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany
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Singh V, Singh R, Kushwaha R. Exploring novel protein biomarkers for early-stage diagnosis and prognosis of T-acute lymphoblastic leukemia (T-ALL). Hematol Transfus Cell Ther 2024:S2531-1379(24)00063-4. [PMID: 38584071 DOI: 10.1016/j.htct.2024.02.016] [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: 08/26/2023] [Accepted: 02/12/2024] [Indexed: 04/09/2024] Open
Abstract
BACKGROUND Efficient classification of T-acute lymphoblastic leukemia (T-ALL) involves considering various factors, such as age, white blood cell count, and chromosomal alterations. However, studying protein markers are crucial to improving T-ALL patients' diagnosis and treatment. A study analyzing the expression of proteomes was conducted to identify promising early-stage biomarkers for T-ALL patients METHODS: Label-free liquid chromatography-tandem mass spectrometry (LC-MS/MS) was used to analyze the blood proteins of both patients and healthy individuals to identify new biomarkers for T-ALL. The findings were validated by RT-PCR, ELISA and computational analysis RESULTS: The study identified 1467 proteins in the blood, of which nine were upregulated and 35 were downregulated by more than 2-fold. T-ALL patients showed a significant increase in specific disease-related proteins, such as eleven-nineteen lysine-rich leukemia protein, triggering receptor expressed on myeloid cells 1, cisplatin resistance-associated-overexpressed protein, X-ray radiation resistance-associated protein 1, tumor necrosis factor receptor superfamily member 10D, protein S100-A8, and copine-4, by more than 3-fold CONCLUSION: The findings of this study provide a valuable protein map of leukemic cells and identify potential biomarkers for leukemic aggressiveness. However, further studies using larger T-ALL patient samples must confirm these preliminary results.
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Affiliation(s)
- Vivek Singh
- King George's Medical University, Lucknow, UP, India
| | - Ranjana Singh
- King George's Medical University, Lucknow, UP, India,.
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Qiu L, Sun Y, Ning H, Chen G, Zhao W, Gao Y. The scaffold protein AXIN1: gene ontology, signal network, and physiological function. Cell Commun Signal 2024; 22:77. [PMID: 38291457 PMCID: PMC10826278 DOI: 10.1186/s12964-024-01482-4] [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: 10/23/2023] [Accepted: 01/06/2024] [Indexed: 02/01/2024] Open
Abstract
AXIN1, has been initially identified as a prominent antagonist within the WNT/β-catenin signaling pathway, and subsequently unveiled its integral involvement across a diverse spectrum of signaling cascades. These encompass the WNT/β-catenin, Hippo, TGFβ, AMPK, mTOR, MAPK, and antioxidant signaling pathways. The versatile engagement of AXIN1 underscores its pivotal role in the modulation of developmental biological signaling, maintenance of metabolic homeostasis, and coordination of cellular stress responses. The multifaceted functionalities of AXIN1 render it as a compelling candidate for targeted intervention in the realms of degenerative pathologies, systemic metabolic disorders, cancer therapeutics, and anti-aging strategies. This review provides an intricate exploration of the mechanisms governing mammalian AXIN1 gene expression and protein turnover since its initial discovery, while also elucidating its significance in the regulation of signaling pathways, tissue development, and carcinogenesis. Furthermore, we have introduced the innovative concept of the AXIN1-Associated Phosphokinase Complex (AAPC), where the scaffold protein AXIN1 assumes a pivotal role in orchestrating site-specific phosphorylation modifications through interactions with various phosphokinases and their respective substrates.
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Affiliation(s)
- Lu Qiu
- School of Pharmaceutical Sciences (Shenzhen), Shenzhen Campus of Sun Yat-Sen University, Shenzhen, 518107, China
- School of Life Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Yixuan Sun
- School of Pharmaceutical Sciences (Shenzhen), Shenzhen Campus of Sun Yat-Sen University, Shenzhen, 518107, China
| | - Haoming Ning
- School of Pharmaceutical Sciences (Shenzhen), Shenzhen Campus of Sun Yat-Sen University, Shenzhen, 518107, China
| | - Guanyu Chen
- School of Pharmaceutical Sciences (Shenzhen), Shenzhen Campus of Sun Yat-Sen University, Shenzhen, 518107, China
| | - Wenshan Zhao
- School of Life Sciences, Zhengzhou University, Zhengzhou, 450001, China.
| | - Yanfeng Gao
- School of Pharmaceutical Sciences (Shenzhen), Shenzhen Campus of Sun Yat-Sen University, Shenzhen, 518107, China.
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Eren F, Schwieler L, Orhan F, Malmqvist A, Piehl F, Cervenka S, Sellgren CM, Fatouros-Bergman H, Engberg G, Erhardt S. Immunological protein profiling of first-episode psychosis patients identifies CSF and blood biomarkers correlating with disease severity. Brain Behav Immun 2023; 111:376-385. [PMID: 37146654 DOI: 10.1016/j.bbi.2023.04.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 04/21/2023] [Accepted: 04/30/2023] [Indexed: 05/07/2023] Open
Abstract
BACKGROUND AND HYPOTHESIS Immune activation is suggested to play an important role in psychosis. In this study, a large number of immune-related proteins were analyzed to obtain a more comprehensive picture of immune aberrations in schizophrenia. STUDY DESIGN Ninety-two immune markers were analyzed by the Olink Protein Extension Assay (Inflammatory Panel) in plasma and cerebrospinal fluid (CSF) from 77 first-episode psychosis (FEP) patients (of which 43 later received the diagnosis of schizophrenia) and 56 healthy controls, all recruited from the Karolinska Schizophrenia Project (KaSP), Stockholm, Sweden. STUDY RESULTS Differential analysis showed that 12 of 92 inflammatory proteins were significantly higher in the plasma of FEP patients (n = 77) than in controls, and several proteins were positively correlated with disease severity. Patients from the same cohort diagnosed with schizophrenia (n = 43), showed significantly higher levels of 15 plasma proteins compared to controls whereas those not receiving this diagnosis showed no significant differences. The presently used OLINK inflammatory panel allowed the detection of only 47 CSF proteins of which only CD5 differed between patients and controls. CONCLUSIONS The levels of several peripheral immune markers, particularly those interfering with WNT/β-catenin signaling, were significantly higher in patients with FEP than in healthy controls and associated with illness severity.
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Affiliation(s)
- Feride Eren
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Lilly Schwieler
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Funda Orhan
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Anna Malmqvist
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Fredrik Piehl
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Neuroimmunology Unit, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Simon Cervenka
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Centre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet and Stockholm Health Care Services, Stockholm County Council, Stockholm, Sweden; Department of Medical Sciences, Psychiatry, Uppsala University, Uppsala, Sweden
| | - Carl M Sellgren
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; Centre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet and Stockholm Health Care Services, Stockholm County Council, Stockholm, Sweden
| | - Helena Fatouros-Bergman
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Centre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet and Stockholm Health Care Services, Stockholm County Council, Stockholm, Sweden
| | - Göran Engberg
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
| | - Sophie Erhardt
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
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van Gen Hassend PM, Pottikkadavath A, Delto C, Kuhn M, Endres M, Schönemann L, Schindelin H. RanBP9 controls the oligomeric state of CTLH complex assemblies. J Biol Chem 2023; 299:102869. [PMID: 36621627 PMCID: PMC9932110 DOI: 10.1016/j.jbc.2023.102869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 12/27/2022] [Accepted: 12/28/2022] [Indexed: 01/07/2023] Open
Abstract
The CTLH (C-terminal to lissencephaly-1 homology motif) complex is a multisubunit RING E3 ligase with poorly defined substrate specificity and flexible subunit composition. Two key subunits, muskelin and Wdr26, specify two alternative CTLH complexes that differ in quaternary structure, thereby allowing the E3 ligase to presumably target different substrates. With the aid of different biophysical and biochemical techniques, we characterized CTLH complex assembly pathways, focusing not only on Wdr26 and muskelin but also on RanBP9, Twa1, and Armc8β subunits, which are critical to establish the scaffold of this E3 ligase. We demonstrate that the ability of muskelin to tetramerize and the assembly of Wdr26 into dimers define mutually exclusive oligomerization modules that compete with nanomolar affinity for RanBP9 binding. The remaining scaffolding subunits, Armc8β and Twa1, strongly interact with each other and with RanBP9, again with nanomolar affinity. Our data demonstrate that RanBP9 organizes subunit assembly and prevents higher order oligomerization of dimeric Wdr26 and the Armc8β-Twa1 heterodimer through its tight binding. Combined, our studies define alternative assembly pathways of the CTLH complex and elucidate the role of RanBP9 in governing differential oligomeric assemblies, thereby advancing our mechanistic understanding of CTLH complex architectures.
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Affiliation(s)
- Pia Maria van Gen Hassend
- Julius-Maximilians-Universität Würzburg, Rudolf Virchow Center for Integrative and Translational Bioimaging, Institute of Structural Biology, Würzburg, Germany
| | - Aparna Pottikkadavath
- Julius-Maximilians-Universität Würzburg, Rudolf Virchow Center for Integrative and Translational Bioimaging, Institute of Structural Biology, Würzburg, Germany
| | - Carolyn Delto
- Julius-Maximilians-Universität Würzburg, Rudolf Virchow Center for Integrative and Translational Bioimaging, Institute of Structural Biology, Würzburg, Germany
| | - Monika Kuhn
- Julius-Maximilians-Universität Würzburg, Rudolf Virchow Center for Integrative and Translational Bioimaging, Institute of Structural Biology, Würzburg, Germany
| | - Michelle Endres
- Julius-Maximilians-Universität Würzburg, Rudolf Virchow Center for Integrative and Translational Bioimaging, Institute of Structural Biology, Würzburg, Germany
| | - Lars Schönemann
- Julius-Maximilians-Universität Würzburg, Rudolf Virchow Center for Integrative and Translational Bioimaging, Institute of Structural Biology, Würzburg, Germany
| | - Hermann Schindelin
- Julius-Maximilians-Universität Würzburg, Rudolf Virchow Center for Integrative and Translational Bioimaging, Institute of Structural Biology, Würzburg, Germany.
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7
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Goto T, Shibuya H. maea affects head formation through ß-catenin degradation during early Xenopus laevis development. Dev Growth Differ 2023; 65:29-36. [PMID: 36444483 DOI: 10.1111/dgd.12828] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 10/26/2022] [Accepted: 11/16/2022] [Indexed: 12/03/2022]
Abstract
Canonical Wnt signalling plays important roles in early embryogenesis, such as axis formation due to its activation and head formation due to its inhibition. ß-catenin protein stability is a key factor in canonical Wnt signalling. Several E3 ubiquitin ligases contribute to ß-catenin degradation through the ubiquitin/proteasome system. We characterised an E3 ubiquitin ligase gene, Xenopus laevis macrophage erythroblast attacher (maea), during early development. maea transcripts were ubiquitously detected in early embryos. The expression levels of the Wnt target genes nodal homolog 3, gene 1 (nodal3.1), and siamois homeodomain 1 (sia1), which were induced by injection with ß-catenin mRNA, were reduced by maea.S mRNA co-injection. maea.S overexpression at the anterior dorsal region enlarged head structures, whereas Maea knockdown interfered with head formation in Xenopus embryos. Maea.S decreased and ubiquitinated ß-catenin protein. ß-catenin-4KRs protein, which mutated the four lysine (K) residues known as ubiquitinated sites to arginine (R) residues, was also ubiquitinated and degraded by Maea.S. These findings suggest that Maea contributes to β-catenin degradation by ubiquitination of unknown lysine residues in early Xenopus development.
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Affiliation(s)
- Toshiyasu Goto
- Department of Molecular Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hiroshi Shibuya
- Department of Molecular Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
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8
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SIX3 function in cancer: progression and comprehensive analysis. Cancer Gene Ther 2022; 29:1542-1549. [PMID: 35764712 DOI: 10.1038/s41417-022-00488-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 05/02/2022] [Accepted: 05/27/2022] [Indexed: 02/04/2023]
Abstract
The homeobox gene family encodes transcription factors that are essential for cell growth, proliferation, and differentiation, and its dysfunction is linked to tumor initiation and progression. Sine oculis homeobox (SIX) belongs to the homeobox gene family, with SIX3 being a core member. Recent studies indicate that SXI3 functions as a cancer suppressor or promoter, which is mainly dependent on SIX3's influence on the signal pathways that promote or inhibit cancer in cells. The low expression of SIX3 in most malignant tumors was confirmed by detailed studies, which could promote the cell cycle, proliferation, migration, and angiogenesis. The recovery or upregulation of SIX3 expression to suppress cancer is closely related to the direct or indirect inhibition of the Wnt pathway. However, in some malignancies, such as esophageal cancer and gastric cancer, SIX3 is a tumor-promoting factor, and repressing SIX3 improves patients' prognosis. This review introduces the research progress of SIX3 in tumors and gives a comprehensive analysis, intending to explain why SIX3 plays different roles in different cancers and provide new cancer therapy strategies.
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9
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Onea G, Maitland MER, Wang X, Lajoie GA, Schild-Poulter C. Distinct assemblies and interactomes of the nuclear and cytoplasmic mammalian CTLH E3 ligase complex. J Cell Sci 2022; 135:276121. [PMID: 35833506 DOI: 10.1242/jcs.259638] [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: 11/25/2021] [Accepted: 06/27/2022] [Indexed: 11/20/2022] Open
Abstract
The C-terminal to LisH (CTLH) complex is a newly discovered multi-subunit E3 ubiquitin ligase whose cellular functions are poorly characterized. While some CTLH subunits have been found to localize in both the nucleus and cytoplasm of mammalian cells, differences between the compartment-specific complexes have not been explored. Here, we show that the CTLH complex forms different molecular weight complexes in nuclear and cytoplasmic fractions. Loss of WDR26 severely decreases nuclear CTLH complex subunit levels and impairs higher-order CTLH complex formation, revealing WDR26 as a critical determinant of CTLH complex nuclear stability. Through affinity purification coupled to mass spectrometry (AP-MS) of endogenous CTLH complex member RanBPM from nuclear and cytoplasmic fractions, we identified over 170 compartment-specific interactors involved in various conserved biological processes such as ribonucleoprotein biogenesis and chromatin assembly. We validated the nuclear-specific RanBPM interaction with macroH2A1 and the cytoplasmic-specific interaction with Tankyrase-1/2. Overall, this study provides critical insights into CTLH complex function and composition in both the cytoplasm and nucleus.
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Affiliation(s)
- Gabriel Onea
- Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada
| | - Matthew E R Maitland
- Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada.,Don Rix Protein Identification Facility, University of Western Ontario, London, Ontario, N6G 2V4, Canada
| | - Xu Wang
- Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada
| | - Gilles A Lajoie
- Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada.,Don Rix Protein Identification Facility, University of Western Ontario, London, Ontario, N6G 2V4, Canada
| | - Caroline Schild-Poulter
- Robarts Research Institute, University of Western Ontario, London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, University of Western Ontario, London, Ontario, ON N6G 2V4, Canada
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10
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Maitland MER, Lajoie GA, Shaw GS, Schild-Poulter C. Structural and Functional Insights into GID/CTLH E3 Ligase Complexes. Int J Mol Sci 2022; 23:5863. [PMID: 35682545 PMCID: PMC9180843 DOI: 10.3390/ijms23115863] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/18/2022] [Accepted: 05/20/2022] [Indexed: 11/29/2022] Open
Abstract
Multi-subunit E3 ligases facilitate ubiquitin transfer by coordinating various substrate receptor subunits with a single catalytic center. Small molecules inducing targeted protein degradation have exploited such complexes, proving successful as therapeutics against previously undruggable targets. The C-terminal to LisH (CTLH) complex, also called the glucose-induced degradation deficient (GID) complex, is a multi-subunit E3 ligase complex highly conserved from Saccharomyces cerevisiae to humans, with roles in fundamental pathways controlling homeostasis and development in several species. However, we are only beginning to understand its mechanistic basis. Here, we review the literature of the CTLH complex from all organisms and place previous findings on individual subunits into context with recent breakthroughs on its structure and function.
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Affiliation(s)
- Matthew E. R. Maitland
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON N6A 5B7, Canada;
- Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON N6G 2V4, Canada; (G.A.L.); (G.S.S.)
| | - Gilles A. Lajoie
- Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON N6G 2V4, Canada; (G.A.L.); (G.S.S.)
| | - Gary S. Shaw
- Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON N6G 2V4, Canada; (G.A.L.); (G.S.S.)
| | - Caroline Schild-Poulter
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON N6A 5B7, Canada;
- Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON N6G 2V4, Canada; (G.A.L.); (G.S.S.)
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11
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Bao Q, Zhang X, Bao P, Liang C, Guo X, Yin M, Chu M, Yan P. Genome-wide identification, characterization, and expression analysis of keratin genes (KRTs) family in yak (Bos grunniens). Gene X 2022; 818:146247. [PMID: 35085710 DOI: 10.1016/j.gene.2022.146247] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 01/13/2022] [Accepted: 01/21/2022] [Indexed: 11/25/2022] Open
Abstract
As the largest subgroup of intermediate filament proteins, keratins are divided into two types of subfamily. Currently, the molecular mechanism of keratins in several animals has been reported but is limited in yak. Here, 53 different kinds of keratins were identified in the yak genome, including 23 type I and 30 type II keratins. Bioinformatics analysis in this study revealed that multiple phosphorylation sites were identified among all the family members. And the subcellular localization of these proteins was predicted to be in the nucleus, cytoskeleton, and cytoplasm. All keratin family proteins were unstable and the scores of instability coefficient were higher than 40. Phylogenetic analysis showed that high consistency results of the sequence conservation and grouping were found in the genomes of yak, sheep, cattle, mouse, rat, and human. Based on the expression patterns obtained from the transcriptome data, keratin genes (KRTs) were grouped into five clusters, and results also showed that KRTs were highly activated in skin tissues during the hair cycle in yak. Among the five clusters, Cluster II contained the most KRTs, which was the main expression pattern of the yak hair follicle cycle, followed by Cluster III. These results indicated the transition period from telogen to anagen and catagen to telogen were highly dynamic in yak. Gene expression correlation analysis showed that KRTs exhibited a strong correlation (mainly positive correlation) throughout the hair follicle development cycle. And the identification of hub KRTs in specific modules related to hair follicle development in this study was performed using the Weight Gene Co-Expression Network Analysis (WGCNA). Specific modules that include KRTs were darkgreen (KRT40), darkgrey (KRT5), turquoise (KRT1, KRT2, KRT10), bisque4 (KRT4), thistle2 (KRT9, KRT39), and yellowgreen (KRT24). The interaction network showed that these genes were found to be related to the regulation of cell cycle, melanogenesis, hair follicle development, keratinocyte proliferation. Our study provides theoretical support for the study of the evolutionary relationship and molecular mechanism of keratin family in B. grunnien.
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Affiliation(s)
- Qi Bao
- Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Key Laboratory of Yak Breeding Engineering, Lanzhou 730050, China
| | - Xiaolan Zhang
- Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Key Laboratory of Yak Breeding Engineering, Lanzhou 730050, China
| | - Pengjia Bao
- Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Key Laboratory of Yak Breeding Engineering, Lanzhou 730050, China
| | - Chunnian Liang
- Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Key Laboratory of Yak Breeding Engineering, Lanzhou 730050, China
| | - Xian Guo
- Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Key Laboratory of Yak Breeding Engineering, Lanzhou 730050, China
| | - Mancai Yin
- Datong Cattle Farm in Qinghai Province, Xining 810000, China
| | - Min Chu
- Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Key Laboratory of Yak Breeding Engineering, Lanzhou 730050, China
| | - Ping Yan
- Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; Key Laboratory of Yak Breeding Engineering, Lanzhou 730050, China.
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12
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Mei H, Yang L, Xiao T, Wang S, Wu B, Wang H, Lu Y, Dong X, Yang H, Zhou W. Genetic Spectrum Identified by Exome Sequencing in a Chinese Pediatric Cerebral Palsy Cohort. J Pediatr 2022; 242:206-212.e6. [PMID: 34788679 DOI: 10.1016/j.jpeds.2021.11.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 10/29/2021] [Accepted: 11/10/2021] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To explore the genetic spectrum of cerebral palsy (CP) in a Chinese pediatric cohort. STUDY DESIGN This was a retrospective observational study of patients with CP from the Children's Hospital of Fudan University between June 2015 and December 2019. Their clinical data and exome sequencing data were collected and analyzed. RESULTS A total of 217 patients with CP were enrolled, and genetic variants were identified in 78 subjects (35.9%): 65 patients with single-nucleotide variants (SNVs), 12 patients with copy number variants, and 1 patient with both an SNV and a copy number variant. The genetic diagnosis rates were significantly greater in patients without clinical risk factors than in patients with clinical risk factors (χ2 = 21.705, P = .000) and were significantly greater in patients with a family history than in those without a family history (χ2 = 4.493, P = .034). Variants in genes related to neurologic disorders were the most commonly detected variants, affecting 41 patients (62.1%, 41/66). Among the patients with SNVs detected, the top 12 genes were found to cover 62.1% (41/66) of cases, and 39.4% (26/66) of patients with SNVs had medically actionable genetic findings. CONCLUSIONS The overall genetic diagnostic rate in this study was 35.9%, and patients without any clinical risk factors or with a family history were more likely to have genetic risk factors. The top 12 genes detected in this study as well as genes related to neurologic disorders or other medically actionable disorders should be noted in the analysis of genetic testing results in patients with CP.
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Affiliation(s)
- Hongfang Mei
- Department of Neonatology, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China
| | - Lin Yang
- Department of Pediatric Endocrinology and Inherited Metabolic Diseases, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China
| | - Tiantian Xiao
- Department of Neonatology, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China
| | - Sujuan Wang
- Department of Rehabilitation, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China
| | - Bingbing Wu
- Key Laboratory of Birth Defects, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China
| | - Huijun Wang
- Key Laboratory of Birth Defects, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China
| | - Yulan Lu
- Key Laboratory of Birth Defects, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China
| | - Xinran Dong
- Key Laboratory of Birth Defects, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China
| | - Hong Yang
- Department of Rehabilitation, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China
| | - Wenhao Zhou
- Department of Neonatology, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China; Key Laboratory of Birth Defects, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai, China.
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13
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WD-40 repeat protein 26 protects against oxidative stress-induced injury in astrocytes via Nrf2/HO-1 pathways. Mol Biol Rep 2022; 49:1045-1056. [PMID: 34981336 DOI: 10.1007/s11033-021-06925-6] [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: 08/18/2021] [Accepted: 10/30/2021] [Indexed: 10/19/2022]
Abstract
BACKGROUND Stroke is the leading cause of disability and the third leading cause of death in the world, and no effective treatment has been developed. Oxidative stress-induced cell injury and genomic instability is implicated in the pathogenesis of stroke, whose prognosis remains poor. METHODS A model of cerebral ischemic/reperfusion injury model was established through four artery occlusions. This study was carried out using western blot, flow cytometry and RT-PCR on cell line U251-MG. The cytotoxic effect of H2O2 and expression of LDH, caspase-3, MDA and SOD was analyzed by assay kit. RESULTS We found that the expression of WDR26 was induced in cerebral ischemia-reperfusion injury in vivo and the expression of WDR26 was induced by H2O2 in a dose- and time-dependent manner in vitro. WDR26 over-expression significantly suppressed H2O2-induced cell death and caspase-3-mediated apoptosis in U251-MG cells. In contrast, inhibition of WDR26 markedly enhanced cell death in U251-MG cells. In addition, WDR26 regulated oxidative stress response and induced Nrf2/HO-1 pathway. CONCLUSIONS These findings suggest that WDR26 mediates H2O2-induced oxidative stress and cell injury, possibly by reducing the intrinsic apoptotic pathway and activating Nrf2 and HO-1 in astrocytes.
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14
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Maitland MER, Kuljanin M, Wang X, Lajoie GA, Schild-Poulter C. Proteomic analysis of ubiquitination substrates reveals a CTLH E3 ligase complex-dependent regulation of glycolysis. FASEB J 2021; 35:e21825. [PMID: 34383978 PMCID: PMC9292413 DOI: 10.1096/fj.202100664r] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/25/2021] [Accepted: 07/15/2021] [Indexed: 11/11/2022]
Abstract
Ubiquitination is an essential post‐translational modification that regulates protein stability or function. Its substrate specificity is dictated by various E3 ligases. The human C‐terminal to LisH (CTLH) complex is a newly discovered multi‐subunit really interesting new gene (RING) E3 ligase with only a few known ubiquitination targets. Here, we used mass spectrometry‐based proteomic techniques to gain insight into CTLH complex function and ubiquitination substrates in HeLa cells. First, global proteomics determined proteins that were significantly increased, and thus may be substrates targeted for degradation, in cells depleted of CTLH complex member RanBPM. RanBPM‐dependent ubiquitination determined using diGLY‐enriched proteomics and the endogenous RanBPM interactome further revealed candidate ubiquitination targets. Three glycolysis enzymes alpha‐enolase, L‐lactate dehydrogenase A chain (LDHA), and pyruvate kinase M1/2 (PKM) had decreased ubiquitin sites in shRanBPM cells and were found associated with RanBPM in the interactome. Reduced polyubiquitination was validated for PKM2 and LDHA in cells depleted of RanBPM and CTLH complex RING domain subunit RMND5A. PKM2 and LDHA protein levels were unchanged, yet their activity was increased in extracts of cells with downregulated RanBPM. Finally, RanBPM deficient cells displayed enhanced glycolysis and deregulated central carbon metabolism. Overall, this study identifies potential CTLH complex ubiquitination substrates and uncovers that the CTLH complex inhibits glycolysis via non‐degradative ubiquitination of PKM2 and LDHA.
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Affiliation(s)
- Matthew E R Maitland
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Don Rix Protein Identification Facility, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
| | - Miljan Kuljanin
- Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Don Rix Protein Identification Facility, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
| | - Xu Wang
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
| | - Gilles A Lajoie
- Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Don Rix Protein Identification Facility, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
| | - Caroline Schild-Poulter
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.,Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
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15
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Pavinato L, Trajkova S, Grosso E, Giorgio E, Bruselles A, Radio FC, Pippucci T, Dimartino P, Tartaglia M, Petlichkovski A, De Rubeis S, Buxbaum J, Ferrero GB, Keller R, Brusco A. Expanding the clinical phenotype of the ultra-rare Skraban-Deardorff syndrome: Two novel individuals with WDR26 loss-of-function variants and a literature review. Am J Med Genet A 2021; 185:1712-1720. [PMID: 33675273 DOI: 10.1002/ajmg.a.62157] [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: 08/25/2020] [Revised: 02/22/2021] [Accepted: 02/22/2021] [Indexed: 12/23/2022]
Abstract
De novo variants in the WDR26 gene leading to haploinsufficiency have recently been associated with Skraban-Deardorff syndrome. This condition is an ultra-rare autosomal dominant neurodevelopmental disorder characterized by a broad range of clinical signs, including intellectual disability (ID), developmental delay (DD), seizures, abnormal facial features, feeding difficulties, and minor skeletal anomalies. Currently, 18 cases have been reported in the literature and for only 15 of them a clinical description is available. Here, we describe a child with Skraban-Deardorff syndrome associated with the WDR26 pathogenic de novo variant NM_025160.6:c.69dupC, p.(Gly24ArgfsTer48), and an adult associated with the pathogenic de novo variant c.1076G > A, p.(Trp359Ter). The adult patient was a 29-year-old female with detailed information on clinical history and pharmacological treatments since birth, providing an opportunity to map disease progression and patient management. By comparing our cases with published reports of Skraban-Deardorff syndrome, we provide a genetic and clinical summary of this ultrarare condition, describe the clinical management from childhood to adult age, and further expand on the clinical phenotype.
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Affiliation(s)
- Lisa Pavinato
- Department of Medical Sciences, University of Turin, Turin, Italy.,Institute of Human Genetics and Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany
| | - Slavica Trajkova
- Department of Medical Sciences, University of Turin, Turin, Italy
| | - Enrico Grosso
- Medical Genetics Unit, Città della Salute e della Scienza University Hospital, Turin, Italy
| | - Elisa Giorgio
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Alessandro Bruselles
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | | | - Tommaso Pippucci
- Medical Genetics Unit, Polyclinic Sant'Orsola-Malpighi University Hospital, Bologna, Italy
| | - Paola Dimartino
- Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Marco Tartaglia
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, IRCCS, Rome, Italy
| | - Aleksandar Petlichkovski
- Institute for Immunobiology and Human Genetics, Faculty of Medicine, University "Sv. Kiril I Metodij", Skopje, Macedonia
| | - Silvia De Rubeis
- Seaver Autism Center for Research and Treatment, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Joseph Buxbaum
- Seaver Autism Center for Research and Treatment, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Giovanni Battista Ferrero
- Department of Clinical and Biological Sciences, School of Medicine, University of Turin, Orbassano, Torino, Italy
| | - Roberto Keller
- Adult autism center, Mental Health Department, Local Health Unit ASL Città di Torino, Turin, Italy
| | - Alfredo Brusco
- Department of Medical Sciences, University of Turin, Turin, Italy.,Medical Genetics Unit, Città della Salute e della Scienza University Hospital, Turin, Italy
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16
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WD40 Repeat Protein 26 Negatively Regulates Formyl Peptide Receptor-1 Mediated Wound Healing in Intestinal Epithelial Cells. THE AMERICAN JOURNAL OF PATHOLOGY 2020; 190:2029-2038. [PMID: 32958140 DOI: 10.1016/j.ajpath.2020.06.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/26/2020] [Accepted: 06/05/2020] [Indexed: 11/22/2022]
Abstract
N-formyl peptide receptors (FPRs) serve as phagocyte pattern-recognition receptors that play a crucial role in the regulation of host defense against infection. Epithelial cells also express FPRs, and their activation during inflammation or injury results in enhanced epithelial migration and proliferation and improved mucosal wound repair. However, signaling mechanisms that govern epithelial FPR1 activity are not well understood. This study identified a novel FPR1-interacting protein, WD40 repeat protein (WDR)-26, which negatively regulates FPR1-mediated wound healing in intestinal epithelial cells. We show that WDR26-mediated inhibition of wound repair is mediated through the inhibition of Rac family small GTPase 1 and cell division cycle 42 activation, as well as downstream intracellular reactive oxygen species production. Furthermore, on FPR1 activation with N-formyl-methionyl-leucyl phenylalanine, WDR26 dissociates from FPR1, resulting in the activation of downstream cell division cycle 42/Rac family small GTPase 1 signaling, increased epithelial cell migration, and mucosal wound repair. These findings elucidate a novel regulatory function of WDR26 in FPR1-mediated wound healing in intestinal epithelial cells.
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17
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WNK regulates Wnt signalling and β-Catenin levels by interfering with the interaction between β-Catenin and GID. Commun Biol 2020; 3:666. [PMID: 33184430 PMCID: PMC7665214 DOI: 10.1038/s42003-020-01386-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 10/16/2020] [Indexed: 12/25/2022] Open
Abstract
β-Catenin is an important component of the Wnt signalling pathway. As dysregulation or mutation of this pathway causes many diseases, including cancer, the β-Catenin level is carefully regulated by the destruction complex in the Wnt signalling pathway. However, the mechanisms underlying the regulation of β-Catenin ubiquitination and degradation remain unclear. Here, we find that WNK (With No Lysine [K]) kinase is a potential regulator of the Wnt signalling pathway. We show that WNK protects the interaction between β-Catenin and the Glucose-Induced degradation Deficient (GID) complex, which includes an E3 ubiquitin ligase targeting β-Catenin, and that WNK regulates the β-Catenin level. Furthermore, we show that WNK inhibitors induced β-Catenin degradation and that one of these inhibitors suppressed xenograft tumour development in mice. These results suggest that WNK is a previously unrecognized regulator of β-Catenin and a therapeutic target of cancer. Sato et al. find that WNK (With No Lysine [K]) acts as a positive regulator of the Wnt signaling pathway by attenuating the interaction between β-Catenin and the Glucose Induce degradation Deficient (GID) complex, and show that a WNK inhibitor also functions as a Wnt inhibitor, suppressing xenograft tumor development in mice. These findings suggest that WNK is a regulator of β-Catenin and a potential therapeutic target
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18
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Minor MM, Hollinger FB, McNees AL, Jung SY, Jain A, Hyser JM, Bissig KD, Slagle BL. Hepatitis B Virus HBx Protein Mediates the Degradation of Host Restriction Factors through the Cullin 4 DDB1 E3 Ubiquitin Ligase Complex. Cells 2020; 9:E834. [PMID: 32235678 PMCID: PMC7226812 DOI: 10.3390/cells9040834] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/24/2020] [Accepted: 03/25/2020] [Indexed: 02/06/2023] Open
Abstract
The hepatitis B virus (HBV) regulatory HBx protein is required for infection, and its binding to cellular damaged DNA binding protein 1 (DDB1) is critical for this function. DDB1 is an adaptor protein for the cullin 4A Really Interesting New Gene (RING) E3 ubiquitin ligase (CRL4) complex and functions by binding cellular DDB1 cullin associated factor (DCAF) receptor proteins that recruit substrates for ubiquitination and degradation. We compared the proteins found in the CRL4 complex immunoprecipitated from uninfected versus HBV-infected hepatocytes from human liver chimeric mice for insight into mechanisms by which HBV and the cell interact within the CRL4 complex. Consistent with its role as a viral DCAF, HBx was found in the HBV CRL4 complexes. In tissue culture transfection experiments, we showed that HBx expression led to decreased levels of known restriction factor structural maintenance of chromosomes protein 6 (SMC6) and putative restriction factors stromal interaction molecule 1 (STIM1, zinc finger E-box binding homeobox 2 (ZEB2), and proteasome activator subunit 4 (PSME4). Moreover, silencing of these proteins led to increased HBV replication in the HepG2-sodium taurocholate cotransporting polypeptide (NTCP) infection model. We also identified cellular DCAF receptors in CRL4 complexes from humanized mice. Increasing amounts of HBx did not reveal competitive DCAF binding to cullin4 (CUL4)-DDB1 in plasmid-transfected cells. Our results suggest a model in which HBx benefits virus replication by directly or indirectly degrading multiple cellular restriction factors.
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Affiliation(s)
- Marissa M. Minor
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA; (M.M.M.); (F.B.H.); (A.L.M.); (J.M.H.)
| | - F. Blaine Hollinger
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA; (M.M.M.); (F.B.H.); (A.L.M.); (J.M.H.)
| | - Adrienne L. McNees
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA; (M.M.M.); (F.B.H.); (A.L.M.); (J.M.H.)
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX 77030, USA;
| | - Sung Yun Jung
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX 77030, USA;
- Department of Biochemistry, Baylor College of Medicine, Houston, TX 77030, USA
| | - Antrix Jain
- Mass Spectrometry Proteomics Core, Baylor College of Medicine, Houston, TX 77030, USA;
| | - Joseph M. Hyser
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA; (M.M.M.); (F.B.H.); (A.L.M.); (J.M.H.)
| | - Karl-Dimiter Bissig
- Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, TX 77030, USA;
| | - Betty L. Slagle
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA; (M.M.M.); (F.B.H.); (A.L.M.); (J.M.H.)
- Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX 77030, USA;
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19
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The CTLH Complex in Cancer Cell Plasticity. JOURNAL OF ONCOLOGY 2019; 2019:4216750. [PMID: 31885576 PMCID: PMC6907057 DOI: 10.1155/2019/4216750] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/24/2019] [Accepted: 10/25/2019] [Indexed: 12/12/2022]
Abstract
Cancer cell plasticity is the ability of cancer cells to intermittently morph into different fittest phenotypic states. Due to the intrinsic capacity to change their composition and interactions, protein macromolecular complexes are the ideal instruments for transient transformation. This review focuses on a poorly studied mammalian macromolecular complex called the CTLH (carboxy-terminal to LisH) complex. Currently, this macrostructure includes 11 known members (ARMC8, GID4, GID8, MAEA, MKLN1, RMND5A, RMND5B, RANBP9, RANBP10, WDR26, and YPEL5) and it has been shown to have E3-ligase enzymatic activity. CTLH proteins have been linked to all fundamental biological processes including proliferation, survival, programmed cell death, cell adhesion, and migration. At molecular level, the complex seems to interact and intertwine with key signaling pathways such as the PI3-kinase, WNT, TGFβ, and NFκB, which are key to cancer cell plasticity. As a whole, the CTLH complex is overexpressed in the most prevalent types of cancer and may hold the key to unlock many of the biological secrets that allow cancer cells to thrive in harsh conditions and resist antineoplastic therapy.
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20
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Salemi LM, Maitland MER, McTavish CJ, Schild-Poulter C. Cell signalling pathway regulation by RanBPM: molecular insights and disease implications. Open Biol 2018; 7:rsob.170081. [PMID: 28659384 PMCID: PMC5493780 DOI: 10.1098/rsob.170081] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2017] [Accepted: 06/01/2017] [Indexed: 12/25/2022] Open
Abstract
RanBPM (Ran-binding protein M, also called RanBP9) is an evolutionarily conserved, ubiquitous protein which localizes to both nucleus and cytoplasm. RanBPM has been implicated in the regulation of a number of signalling pathways to regulate several cellular processes such as apoptosis, cell adhesion, migration as well as transcription, and plays a critical role during development. In addition, RanBPM has been shown to regulate pathways implicated in cancer and Alzheimer's disease, implying that RanBPM has important functions in both normal and pathological development. While its functions in these processes are still poorly understood, RanBPM has been identified as a component of a large complex, termed the CTLH (C-terminal to LisH) complex. The yeast homologue of this complex functions as an E3 ubiquitin ligase that targets enzymes of the gluconeogenesis pathway. While the CTLH complex E3 ubiquitin ligase activity and substrates still remain to be characterized, the high level of conservation between the complexes in yeast and mammals infers that the CTLH complex could also serve to promote the degradation of specific substrates through ubiquitination, therefore suggesting the possibility that RanBPM's various functions may be mediated through the activity of the CTLH complex.
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Affiliation(s)
- Louisa M Salemi
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
| | - Matthew E R Maitland
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
| | - Christina J McTavish
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
| | - Caroline Schild-Poulter
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
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21
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Zhu XB, Lin WJ, Lv C, Wang L, Huang ZX, Yang SW, Chen X. MicroRNA-539 promotes osteoblast proliferation and differentiation and osteoclast apoptosis through the AXNA-dependent Wnt signaling pathway in osteoporotic rats. J Cell Biochem 2018; 119:8346-8358. [PMID: 29893431 DOI: 10.1002/jcb.26910] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Accepted: 03/28/2018] [Indexed: 01/08/2023]
Abstract
This study aims to explore the effects of miR-539 on osteoblast proliferation and differentiation and osteoclast apoptosis in a rat model of osteoporosis, and its mechanism involving the regulation of the AXIN1-mediated wingless-Int (Wnt) signaling pathway. A rat model of osteoporosis was successfully established by ovariectomy. With osteoblasts and osteoclasts of rats not receiving ovariectomy in the sham group as control, those of osteoporotic rats were treated with miR-539 inhibitor, miR-539 mimic, and AXIN1 shRNA. The expression of miR-53, AXIN1, the Wnt pathway related-genes, apoptosis related-genes, and osteogenic markers were measured by RT-qPCR and Western blot analysis, respectively. Alkaline phosphatase (ALP) activity in osteoblast and tartrate-resistant acid phosphatase (TRAP) activity in osteoclasts were determined after cell transfection. Osteoblast and osteoclast viability was assayed by CCK-8 assay. Cell cycle and apoptosis of osteoblasts and osteoclasts were detected by flow cytometry. Lastly, alizarin red S staining was used to detect mineralized nodules of osteoblasts. Firstly, we determined that miR-539 was down-regulated in osteoblast and osteoclast of osteoporotic rats and AXIN1 was negatively regulated by miR-539. Additionally, overexpression of miR-539 increased the expressions of β-catenin, LEF1, c-myc, cyclin D1, RUNX2, BGP, BMP-2 in osteoblast as well as β-catenin, RhoA, caspase-3, and Bcl-2 in osteoclasts. Finally, overexpression of miR-539 elevated ALP activity, proliferation, and mineralized nodules in osteoblast and osteoclast apoptosis, with reduced TRAP activity in osteoclasts. Our results demonstrate that miR-539 promotes osteoblast proliferation and differentiation as well as osteoclast apoptosis through the AXIN1-dependent Wnt signaling pathway in osteoporotic rats.
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Affiliation(s)
- Xiong-Bai Zhu
- Department of Orthopedics, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, P.R. China
| | - Wen-Jun Lin
- Department of Orthopedics, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, P.R. China
| | - Chen Lv
- Department of Orthopedics, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, P.R. China
| | - Lu Wang
- Department of Orthopedics, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, P.R. China
| | - Zheng-Xiang Huang
- Department of Orthopedics, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, P.R. China
| | - Sheng-Wu Yang
- Department of Orthopedics, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, P.R. China
| | - Xin Chen
- Department of Orthopedics, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, P.R. China
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22
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Shah VJ, Maddika S. CRL7 SMU1 E3 ligase complex-driven H2B ubiquitylation functions in sister chromatid cohesion by regulating SMC1 expression. J Cell Sci 2018; 131:jcs.213868. [PMID: 29507117 DOI: 10.1242/jcs.213868] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 02/26/2018] [Indexed: 12/26/2022] Open
Abstract
Cullin-RING-type E3 ligases (CRLs) control a broad range of biological processes by ubiquitylating numerous cellular substrates. However, the role of CRL E3 ligases in chromatid cohesion is unknown. In this study, we identified a new CRL-type E3 ligase (designated as CRL7SMU1 complex) that has an essential role in the maintenance of chromatid cohesion. We demonstrate that SMU1, DDB1, CUL7 and RNF40 are integral components of this complex. SMU1, by acting as a substrate recognition module, binds to H2B and mediates monoubiquitylation at the lysine (K) residue K120 through CRL7SMU1 E3 ligase complex. Depletion of CRL7SMU1 leads to loss of H2B ubiquitylation at the SMC1a locus and, thus, subsequently compromised SMC1a expression in cells. Knockdown of CRL7SMU1 components or loss of H2B ubiquitylation leads to defective sister chromatid cohesion, which is rescued by restoration of SMC1a expression. Together, our results unveil an important role of CRL7SMU1 E3 ligase in promoting H2B ubiquitylation for maintenance of sister chromatid cohesion during mitosis.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Varun Jayeshkumar Shah
- Laboratory of Cell Death & Cell Survival, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, India-500 039.,Graduate studies, Manipal Academy of Higher Education, Manipal, India-576 104
| | - Subbareddy Maddika
- Laboratory of Cell Death & Cell Survival, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, India-500 039
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23
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Chen B. A novel long noncoding RNA lncWDR26 suppresses the growth and metastasis of hepatocellular carcinoma cells through interaction with SIX3. Am J Cancer Res 2018; 8:688-698. [PMID: 29736313 PMCID: PMC5934558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 11/01/2017] [Indexed: 06/08/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is the third leading cause of cancer-related deaths worldwide. Long noncoding RNAs (lncRNAs) are involved in the tumorigenesis and progression of some cancers. However, only a handful of lncRNAs have been functionally identified in HCC. In the present study, we identified a novel functional lncRNA in HCC, termed lncWDR26 (GenBank Accession no. RP11-365O16). Here, we reported that lncWDR26 was significantly downregulated in HCC tissues and cells. Moreover, decreased lncWDR26 expression correlates with larger tumor size, higher clinical stage, and tumor metastasis, and also predicts poor prognosis in patients with HCC. In HCC cells, overexpression of lncWDR26 inhibited growth and metastasis, both in vitro and in vivo. Mechanistically, lncWDR26 suppressed HCC growth and metastasis by inhibiting WDR26 transcription. Notably, lncWDR26 was associated with SIX homeobox 3 (SIX3), and this association was required for the repression of WDR26 transcription. Together, these results indicate that lncWDR26 is a tumor suppressor lncRNA that promotes tumor progression, leading us to propose that lncRNAs may serve as key regulatory hubs in HCC progression.
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Affiliation(s)
- Baosheng Chen
- Department of Second General Surgery, Hebei Cangzhou Central Hospital Cangzhou 061000, Heibei Province, China
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24
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Jiang L, Wang H, Chen G, Feng Y, Zou J, Liu M, Liu K, Wang N, Zhang H, Wang K, Xiao X. WDR26/MIP2 interacts with VDAC1 and regulates VDAC1 expression levels in H9c2 cells. Free Radic Biol Med 2018; 117:58-65. [PMID: 29253592 DOI: 10.1016/j.freeradbiomed.2017.12.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 12/14/2017] [Indexed: 01/28/2023]
Abstract
MIP2, one of WDR26 isoforms, encodes a 498 amino acid protein with an amino-terminal CTLH domain and five carboxyl-terminal WD40 motifs. MIP2 is localized to the mitochondria and protects cardiomyocytes against oxidative stress; however, nothing is known about how MIP2 confers its cytoprotection. Using co-immunoprecipitation (co-IP) method to isolate MIP2-protein complex from Sprague -Dawley rat heart, followed by mass spectrometry analysis, we have identified VDAC1, a protein located at mitochondria, as a novel MIP2-interacting protein in the myocardium of rat hearts as well as H9c2 cells. This interaction was further confirmed by co-IP assays in the myocardial tissues and H9c2 cardiomyocytes, and by protein overlay assay (POA) in vitro. It was shown that MIP2 overexpression alleviated the H2O2-induced increase of VDAC1 and cell damage, and MIP2 deficiency aggravated the increase of VDAC1 and cell damage in H2O2 -treated H9c2 cells. Our research suggests that the protective effect of MIP2 on the cardiomyocytes against oxidative stress is partly associated with its interaction with VDAC1 and thus inhibiting its expression.
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Affiliation(s)
- Lei Jiang
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Hao Wang
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Guangbin Chen
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Yansheng Feng
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Jiang Zou
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Meidong Liu
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Ke Liu
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Nian Wang
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Huali Zhang
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Kangkai Wang
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China
| | - Xianzhong Xiao
- Department of Pathophysiology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, PR China.
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Abdul AURM, De Silva B, Gary RK. The GSK3 kinase inhibitor lithium produces unexpected hyperphosphorylation of β-catenin, a GSK3 substrate, in human glioblastoma cells. Biol Open 2018; 7:bio.030874. [PMID: 29212798 PMCID: PMC5829510 DOI: 10.1242/bio.030874] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Lithium salt is a classic glycogen synthase kinase 3 (GSK3) inhibitor. Beryllium is a structurally related inhibitor that is more potent but relatively uncharacterized. This study examined the effects of these inhibitors on the phosphorylation of endogenous GSK3 substrates. In NIH-3T3 cells, both salts caused a decrease in phosphorylated glycogen synthase, as expected. GSK3 inhibitors produce enhanced phosphorylation of Ser9 of GSK3β via a positive feedback mechanism, and both salts elicited this enhancement. Another GSK3 substrate is β-catenin, which has a central role in Wnt signaling. In A172 human glioblastoma cells, lithium treatment caused a surprising increase in phospho-Ser33/Ser37-β-catenin, which was quantified using an antibody-coupled capillary electrophoresis method. The β-catenin hyperphosphorylation was unaffected by p53 RNAi knockdown, indicating that p53 is not involved in the mechanism of this response. Lithium caused a decrease in the abundance of axin, a component of the β-catenin destruction complex that has a role in coordinating β-catenin ubiquitination and protein turnover. The axin and phospho-β-catenin results were reproduced in U251 and U87MG glioblastoma cell lines. These observations run contrary to the conventional view of the canonical Wnt signaling pathway, in which a GSK3 inhibitor would be expected to decrease, not increase, phospho-β-catenin levels. This article has an associated First Person interview with the first author of the paper. Summary: GSK3 inhibitors have potential use against Alzheimer's disease and other conditions. In this study, a classic inhibitor produced unexpected molecular effects on key components of the Wnt signaling pathway.
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Affiliation(s)
| | - Bhagya De Silva
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, Las Vegas, NV 89154, USA
| | - Ronald K Gary
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, Las Vegas, NV 89154, USA
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26
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WDR26 Haploinsufficiency Causes a Recognizable Syndrome of Intellectual Disability, Seizures, Abnormal Gait, and Distinctive Facial Features. Am J Hum Genet 2017; 101:139-148. [PMID: 28686853 DOI: 10.1016/j.ajhg.2017.06.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 05/30/2017] [Indexed: 11/21/2022] Open
Abstract
We report 15 individuals with de novo pathogenic variants in WDR26. Eleven of the individuals carry loss-of-function mutations, and four harbor missense substitutions. These 15 individuals comprise ten females and five males, and all have intellectual disability with delayed speech, a history of febrile and/or non-febrile seizures, and a wide-based, spastic, and/or stiff-legged gait. These subjects share a set of common facial features that include a prominent maxilla and upper lip that readily reveal the upper gingiva, widely spaced teeth, and a broad nasal tip. Together, these features comprise a recognizable facial phenotype. We compared these features with those of chromosome 1q41q42 microdeletion syndrome, which typically contains WDR26, and noted that clinical features are consistent between the two subsets, suggesting that haploinsufficiency of WDR26 contributes to the pathology of 1q41q42 microdeletion syndrome. Consistent with this, WDR26 loss-of-function single-nucleotide mutations identified in these subjects lead to nonsense-mediated decay with subsequent reduction of RNA expression and protein levels. We derived a structural model of WDR26 and note that missense variants identified in these individuals localize to highly conserved residues of this WD-40-repeat-containing protein. Given that WDR26 mutations have been identified in ∼1 in 2,000 of subjects in our clinical cohorts and that WDR26 might be poorly annotated in exome variant-interpretation pipelines, we would anticipate that this disorder could be more common than currently appreciated.
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27
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Feng Y, Zhao J, Hou H, Zhang H, Jiao Y, Wang J, Wang Y, Sun Y. WDR26 promotes mitophagy of cardiomyocytes induced by hypoxia through Parkin translocation. Acta Biochim Biophys Sin (Shanghai) 2016; 48:1075-1084. [PMID: 27797717 DOI: 10.1093/abbs/gmw104] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/11/2016] [Accepted: 08/19/2016] [Indexed: 12/14/2022] Open
Abstract
Myocardial ischemia is a heart condition caused by reduction of blood flow to the heart, preventing heart from receiving enough oxygen. Myocardial ischemia is the most common cause of death globally. Heart ischemic preconditioning (IPC) has a protective effect against myocardial cell death induced by ischemia and ischemia-reperfusion injury. WDR26 has recently been identified as a protein that is increased following rat cardiac IPC. WDR26 can promote the proliferation of H9c2 cells and protect cardiomyocytes against oxidative stress through inhibiting apoptosis. However, its role in myocardial ischemia is unclear. The aim of this study was to explore the role of WDR26 in myocardial ischemia and H9c2 cell hypoxia. Our results showed that WDR26 is induced by myocardial ischemia and H9c2 cell hypoxia. WDR26 protects H9c2 cells against hypoxia injury through inhibiting LDH release and increasing cell viability. WDR26 promotes hypoxia-induced autophagy in hypoxia of H9c2 cells. We further demonstrated that in H9c2 cell hypoxia, WDR26 increases mitochondrial membrane potential, thereby increases Parkin translocation of mitochondria. After Parkin is translocated at mitochondria, WDR26 can increase mitochondrial protein ubiquitination in hypoxia of H9c2 cells. WDR26 is a mediator of response to hypoxia, and WDR26 plays an important role in hypoxia-mediated autophagy and mitophagy. This study provides novel insights into the protective role of WDR26 in cardiomyocyte injury during hypoxia. WDR26 may serve as a potential target for the treatment of myocardial ischemia.
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Affiliation(s)
- Yansheng Feng
- Department of Pathophysiology, Xinxiang Medical University, Xinxiang 453003, China
| | - Jia Zhao
- Department of Pathophysiology, Xinxiang Medical University, Xinxiang 453003, China
| | - Huifang Hou
- Department of Pathophysiology, Xinxiang Medical University, Xinxiang 453003, China
- Department of Pathophysiology, West China School of Preclinical Sciences and Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Hui Zhang
- School of Nursing, Xinxiang Medical University, Xinxiang 453003, China
| | - Yunjuan Jiao
- Department of Pathology, Xinxiang Medical University, Xinxiang 453003, China
- Department of Histology and Embryology, School of Basic Medical Sciences, Central South University, Changsha 410008, China
| | - Jiangang Wang
- Department of Pathophysiology, Xinxiang Medical University, Xinxiang 453003, China
| | - Yongling Wang
- Department of Pathophysiology, Xinxiang Medical University, Xinxiang 453003, China
| | - Yinping Sun
- Department of Pathophysiology, Xinxiang Medical University, Xinxiang 453003, China
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28
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Characterization of Novel Molecular Mechanisms Favoring Rac1 Membrane Translocation. PLoS One 2016; 11:e0166715. [PMID: 27835684 PMCID: PMC5105943 DOI: 10.1371/journal.pone.0166715] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Accepted: 11/02/2016] [Indexed: 11/19/2022] Open
Abstract
The Rac1 GTPase plays key roles in cytoskeletal organization, cell motility and a variety of physiological and disease-linked responses. Wild type Rac1 signaling entails dissociation of the GTPase from cytosolic Rac1-Rho GDP dissociation inhibitor (GDI) complexes, translocation to membranes, activation by exchange factors, effector binding, and activation of downstream signaling cascades. Out of those steps, membrane translocation is the less understood. Using transfections of a expression cDNA library in cells expressing a Rac1 bioreporter, we previously identified a cytoskeletal feedback loop nucleated by the F-actin binding protein coronin 1A (Coro1A) that promotes Rac1 translocation to the plasma membrane by facilitating the Pak-dependent dissociation of Rac1-Rho GDI complexes. This screening identified other potential regulators of this process, including WDR26, basigin, and TMEM8A. Here, we show that WDR26 promotes Rac1 translocation following a Coro1A-like and Coro1A-dependent mechanism. By contrast, basigin and TMEM8A stabilize Rac1 at the plasma membrane by inhibiting the internalization of caveolin-rich membrane subdomains. This latter pathway is F-actin-dependent but Coro1A-, Pak- and Rho GDI-independent.
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