1
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Totland MZ, Knudsen LM, Rasmussen NL, Omori Y, Sørensen V, Elster VCW, Stenersen JM, Larsen M, Jensen CL, Zickfeldt Lade AA, Bruusgaard E, Basing S, Kryeziu K, Brech A, Aasen T, Lothe RA, Leithe E. The E3 ubiquitin ligase ITCH negatively regulates intercellular communication via gap junctions by targeting connexin43 for lysosomal degradation. Cell Mol Life Sci 2024; 81:171. [PMID: 38597989 PMCID: PMC11006747 DOI: 10.1007/s00018-024-05165-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 01/27/2024] [Accepted: 02/05/2024] [Indexed: 04/11/2024]
Abstract
Intercellular communication via gap junctions has a fundamental role in regulating cell growth and tissue homeostasis, and its dysregulation may be involved in cancer development and radio- and chemotherapy resistance. Connexin43 (Cx43) is the most ubiquitously expressed gap junction channel protein in human tissues. Emerging evidence indicates that dysregulation of the sorting of Cx43 to lysosomes is important in mediating the loss of Cx43-based gap junctions in cancer cells. However, the molecular basis underlying this process is currently poorly understood. Here, we identified the E3 ubiquitin ligase ITCH as a novel regulator of intercellular communication via gap junctions. We demonstrate that ITCH promotes loss of gap junctions in cervical cancer cells, which is associated with increased degradation of Cx43 in lysosomes. The data further indicate that ITCH interacts with and regulates Cx43 ubiquitination and that the ITCH-induced loss of Cx43-based gap junctions requires its catalytic HECT (homologous to E6-AP C-terminus) domain. The data also suggest that the ability of ITCH to efficiently promote loss of Cx43-based gap junctions and degradation of Cx43 depends on a functional PY (PPXY) motif in the C-terminal tail of Cx43. Together, these data provide new insights into the molecular basis underlying the degradation of Cx43 and have implications for the understanding of how intercellular communication via gap junctions is lost during cancer development.
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Affiliation(s)
- Max Zachrisson Totland
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Lars Mørland Knudsen
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Nikoline Lander Rasmussen
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
- Centre for Molecular Medicine Norway, Faculty of Medicine, Oslo, Norway
| | - Yasufumi Omori
- Department of Molecular and Tumour Pathology, Akita University Graduate School of Medicine, Akita, 010-8543, Japan
| | - Vigdis Sørensen
- Department of Core Facilities, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
- Centre for Cancer Cell Reprogramming, Faculty of Medicine, University of Oslo, Oslo, 0379, Norway
| | - Vilde C Wivestad Elster
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Jakob Mørkved Stenersen
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Mathias Larsen
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Caroline Lunder Jensen
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Anna A Zickfeldt Lade
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Emilie Bruusgaard
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Sebastian Basing
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Kushtrim Kryeziu
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
| | - Andreas Brech
- Department of Core Facilities, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Oslo, 0379, Norway
- Department of Biosciences, Faculty of Mathematics and Natural Sciences, Oslo, 0316, Norway
| | - Trond Aasen
- Patologia Molecular Translacional, Vall d'Hebron Institut de Recerca (VHIR), Vall d'Hebron Hospital Universitari, Vall d'Hebron Barcelona Hospital Campus, Passeig Vall d'Hebron 119-129, Barcelona, 08035, Spain
| | - Ragnhild A Lothe
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
- Department of Biosciences, Faculty of Mathematics and Natural Sciences, Oslo, 0316, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, 0317, Norway
| | - Edward Leithe
- Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospital, Oslo, NO-0424, Norway
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2
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Sakurai Y, Kubota N, Takamoto I, Wada N, Aihara M, Hayashi T, Kubota T, Hiraike Y, Sasako T, Nakao H, Aiba A, Chikaoka Y, Kawamura T, Kadowaki T, Yamauchi T. Overexpression of UBE2E2 in Mouse Pancreatic β-Cells Leads to Glucose Intolerance via Reduction of β-Cell Mass. Diabetes 2024; 73:474-489. [PMID: 38064504 DOI: 10.2337/db23-0150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 12/03/2023] [Indexed: 02/22/2024]
Abstract
Genome-wide association studies have identified several gene polymorphisms, including UBE2E2, associated with type 2 diabetes. Although UBE2E2 is one of the ubiquitin-conjugating enzymes involved in the process of ubiquitin modifications, the pathophysiological roles of UBE2E2 in metabolic dysfunction are not yet understood. Here, we showed upregulated UBE2E2 expression in the islets of a mouse model of diet-induced obesity. The diabetes risk allele of UBE2E2 (rs13094957) in noncoding regions was associated with upregulation of UBE2E2 mRNA in the human pancreas. Although glucose-stimulated insulin secretion was intact in the isolated islets, pancreatic β-cell-specific UBE2E2-transgenic (TG) mice exhibited reduced insulin secretion and decreased β-cell mass. In TG mice, suppressed proliferation of β-cells before the weaning period and while receiving a high-fat diet was accompanied by elevated gene expression levels of p21, resulting in decreased postnatal β-cell mass expansion and compensatory β-cell hyperplasia, respectively. In TG islets, proteomic analysis identified enhanced formation of various types of polyubiquitin chains, accompanied by increased expression of Nedd4 E3 ubiquitin protein ligase. Ubiquitination assays showed that UBE2E2 mediated the elongation of ubiquitin chains by Nedd4. The data suggest that UBE2E2-mediated ubiquitin modifications in β-cells play an important role in regulating glucose homeostasis and β-cell mass.
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Affiliation(s)
- Yoshitaka Sakurai
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Naoto Kubota
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
- Department of Metabolic Medicine, Faculty of Life Science, Kumamoto University, Kumamoto, Japan
- Clinical Nutrition Program, National Institutes of Biomedical Innovation, Health and Nutrition, Osaka, Japan
| | - Iseki Takamoto
- Department of Metabolism and Endocrinology, Ibaraki Medical Center, Tokyo Medical University, Tokyo, Japan
| | - Nobuhiro Wada
- Department of Anatomy I, School of Medicine, Sapporo Medical University, Sapporo, Japan
| | - Masakazu Aihara
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Takanori Hayashi
- Clinical Nutrition Program, National Institutes of Biomedical Innovation, Health and Nutrition, Osaka, Japan
| | - Tetsuya Kubota
- Clinical Nutrition Program, National Institutes of Biomedical Innovation, Health and Nutrition, Osaka, Japan
- Division of Diabetes and Metabolism, Institute of Medical Science, Asahi Life Foundation, Tokyo, Japan
| | - Yuta Hiraike
- Division for Health Service Promotion, The University of Tokyo, Tokyo, Japan
| | - Takayoshi Sasako
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Harumi Nakao
- Laboratory of Animal Resources, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Atsu Aiba
- Laboratory of Animal Resources, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Yoko Chikaoka
- Isotope Science Center, The University of Tokyo, Tokyo, Japan
| | | | | | - Toshimasa Yamauchi
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
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3
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Solt LA. Emerging insights and challenges for understanding T cell function through the proteome. Front Immunol 2022; 13:1028366. [DOI: 10.3389/fimmu.2022.1028366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 10/31/2022] [Indexed: 11/17/2022] Open
Abstract
T cells rapidly transition from a quiescent state into active proliferation and effector function upon exposure to cognate antigen. These processes are tightly controlled by signal transduction pathways that influence changes in chromatin remodeling, gene transcription, and metabolism, all of which collectively drive specific T cell memory or effector cell development. Dysregulation of any of these events can mediate disease and the past several years has shown unprecedented novel approaches to understand these events, down to the single-cell level. The massive explosion of sequencing approaches to assess the genome and transcriptome at the single cell level has transformed our understanding of T cell activation, developmental potential, and effector function under normal and various disease states. Despite these advances, there remains a significant dearth of information regarding how these events are translated to the protein level. For example, resolution of protein isoforms and/or specific post-translational modifications mediating T cell function remains obscure. The application of proteomics can change that, enabling significant insights into molecular mechanisms that regulate T cell function. However, unlike genomic approaches that have enabled exquisite visualization of T cell dynamics at the mRNA and chromatin level, proteomic approaches, including those at the single-cell level, has significantly lagged. In this review, we describe recent studies that have enabled a better understanding of how protein synthesis and degradation change during T cell activation and acquisition of effector function. We also highlight technical advances and how these could be applied to T cell biology. Finally, we discuss future needs to expand upon our current knowledge of T cell proteomes and disease.
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4
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Wei Y, Zhang D, Zuo Y. Whole-exome sequencing reveals genetic variations in humans with differential sensitivity to sevoflurane:A prospective observational study. Biomed Pharmacother 2022; 148:112724. [PMID: 35202912 DOI: 10.1016/j.biopha.2022.112724] [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: 12/26/2021] [Revised: 02/07/2022] [Accepted: 02/15/2022] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND The anesthesia sensitivity is heterogeneous both in animals and humans, while the underlying molecular mechanism has not yet been determined. Here, for the first time, we conducted a prospective observational study to test whether genetic variations contribute to the differential sensitivity to sevoflurane in humans. METHODS Five hundred patients who underwent abdominal surgeries were included. The end-tidal sevoflurane concentration (ETsevo) was adjusted to maintain Bispectral index (BIS) value between 40 and 60. The mean ETsevo from 20 min after endotracheal intubation to 2 h after the beginning of surgery was calculated for each patient. These patients were further divided into high sensitivity group (mean - SD, H group) and low sensitivity group (mean + SD, L group) to investigate the genetic variants related to the differential sensitivity to sevoflurane by whole-exome sequencing (WES) and genome-wide association study (GWAS) in karyocyte from peripheral blood. RESULTS The mean ETsevo of these 500 patients was 1.60% ± 0.34%. After pairing, 55 patients from H group and 59 patients from L group were selected for WES (ETsevo of H group: 1.06% ± 0.13% vs. ETsevo of L group: 2.17% ± 0.16%, P < 0.001), respectively. Finally, FAT atypical cadherin 2 (FAT2, SNP rs174272, rs174271, and rs174261), acireductone dioxygenase 1 (ADI1, SNP rs117278), NEDD4 E3 ubiquitin protein ligase (NEDD4, SNP rs70048, rs70049, and rs70056), and FAD dependent oxidoreductase domain containing 2 (FOXRED2, SNP rs144281) were found to be associated with sevoflurane sensitivity. CONCLUSIONS Genetic variations may contribute to the differential sensitivity to sevoflurane among humans.
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Affiliation(s)
- Yiyong Wei
- Department of Anesthesiology, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Donghang Zhang
- Department of Anesthesiology, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Yunxia Zuo
- Department of Anesthesiology, West China Hospital of Sichuan University, Chengdu 610041, China.
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5
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Das R, Kamal IM, Das S, Chakrabarti S, Chakrabarti O. MITOL-mediated DRP1 ubiquitylation and degradation promotes mitochondrial hyperfusion in CMT2A-linked MFN2 mutant. J Cell Sci 2021; 135:273638. [PMID: 34870686 DOI: 10.1242/jcs.257808] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 11/29/2021] [Indexed: 11/20/2022] Open
Abstract
Mutations in Mitofusin2 (MFN2), associated with the pathology of the debilitating neuropathy, Charcot-Marie-Tooth type 2A (CMT2A) are known to alter mitochondrial morphology. One such abundant MFN2 mutant, R364W results in the generation of elongated, interconnected mitochondria. However, the mechanism leading to this mitochondrial aberration remains poorly understood. Here we show that mitochondrial hyperfusion in the presence of R364W-MFN2 is due to increased degradation of DRP1. The Ubiquitin E3 ligase MITOL is known to ubiquitylate both MFN2 and DRP1. Interaction with and its subsequent ubiquitylation by MITOL is stronger in presence of WT-MFN2 than R364W-MFN2. This differential interaction of MITOL with MFN2 in the presence of R364W-MFN2 renders the ligase more available for DRP1 ubiquitylation. Multimonoubiquitylation and proteasomal degradation of DRP1 in R364W-MFN2 cells in the presence of MITOL eventually leads to mitochondrial hyperfusion. Here we provide a mechanistic insight into mitochondrial hyperfusion, while also reporting that MFN2 can indirectly modulate DRP1 - an effect not shown before.
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Affiliation(s)
- Rajdeep Das
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata - 700064, India.,Homi Bhabha National Institute, India
| | - Izaz Monir Kamal
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, CN 6, Sector V, Salt Lake, Kolkata - 700091, India.,Academy of Scientific and Innovative Research (AcSIR), Gaziabad, India
| | - Subhrangshu Das
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, CN 6, Sector V, Salt Lake, Kolkata - 700091, India
| | - Saikat Chakrabarti
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, CN 6, Sector V, Salt Lake, Kolkata - 700091, India.,Academy of Scientific and Innovative Research (AcSIR), Gaziabad, India
| | - Oishee Chakrabarti
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata - 700064, India.,Homi Bhabha National Institute, India
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6
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Wei Y, Yee PP, Liu Z, Zhang L, Guo H, Zheng H, Anderson B, Gulley M, Li W. NEDD4L-mediated Merlin ubiquitination facilitates Hippo pathway activation. EMBO Rep 2020; 21:e50642. [PMID: 33058421 DOI: 10.15252/embr.202050642] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 09/17/2020] [Accepted: 09/18/2020] [Indexed: 02/01/2023] Open
Abstract
The tumor suppressor Merlin/NF2, a key activator of the Hippo pathway in growth control, is regulated by phosphorylation. However, it is uncertain whether additional post-translational modifications regulate Merlin. Here, we show that ubiquitination is required to activate Merlin in the Hippo pathway. Ubiquitinated Merlin is mostly conjugated by one or two ubiquitin molecules. Such modification is promoted by serine 518 dephosphorylation in response to Ca2+ signaling or cell detachment. Merlin ubiquitination is mediated by the E3 ubiquitin ligase, NEDD4L, which requires a scaffold protein, AMOTL1, to approach Merlin. Several NF2-patient-derived Merlin mutations disrupt its binding to AMOTL1 and its regulation by the AMOTL1-NEDD4L apparatus. Lysine (K) 396 is the major ubiquitin conjugation residue. Disruption of Merlin ubiquitination by the K396R mutation or NEDD4L depletion diminishes its binding to Lats1 and inhibits Lats1 activation. These effects are also accompanied by loss of Merlin's anti-mitogenic and tumor suppressive properties. Thus, we propose that dephosphorylation and ubiquitination compose an intramolecular relay to activate Merlin functions in activating the Hippo pathway during growth control.
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Affiliation(s)
- Yiju Wei
- Division of Hematology and Oncology, Department of Pediatrics, Penn State Health Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA
| | - Patricia P Yee
- Division of Hematology and Oncology, Department of Pediatrics, Penn State Health Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA
| | - Zhijun Liu
- Division of Hematology and Oncology, Department of Pediatrics, Penn State Health Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA
| | - Lei Zhang
- Division of Hematology and Oncology, Department of Pediatrics, Penn State Health Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA.,Hepatic Surgery Center, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hui Guo
- Division of Hematology and Oncology, Department of Pediatrics, Penn State Health Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA
| | - Haiyan Zheng
- Biological Mass Spectrometry Facility, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
| | - Benjamin Anderson
- Division of Hematology and Oncology, Department of Pediatrics, Penn State Health Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA
| | - Melissa Gulley
- Division of Hematology and Oncology, Department of Pediatrics, Penn State Health Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA
| | - Wei Li
- Division of Hematology and Oncology, Department of Pediatrics, Penn State Health Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA.,Department of Biochemistry and Molecular Biology, Penn State Health Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA
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7
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Wang ZW, Hu X, Ye M, Lin M, Chu M, Shen X. NEDD4 E3 ligase: Functions and mechanism in human cancer. Semin Cancer Biol 2020; 67:92-101. [PMID: 32171886 DOI: 10.1016/j.semcancer.2020.03.006] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 03/03/2020] [Accepted: 03/07/2020] [Indexed: 12/11/2022]
Abstract
A growing amount of evidence indicates that the neuronally expressed developmentally downregulated 4 (NEDD4, also known as NEDD4-1) E3 ligase plays a critical role in a variety of cellular processes via the ubiquitination-mediated degradation of multiple substrates. The abnormal regulation of NEDD4 protein has been implicated in cancer development and progression. In this review article, we briefly delineate the downstream substrates and upstream regulators of NEDD4, which are involved in carcinogenesis. Moreover, we succinctly elucidate the functions of NEDD4 protein in tumorigenesis and progression, including cell proliferation, apoptosis, cell cycle, migration, invasion, epithelial mesenchymal transition (EMT), cancer stem cells, and drug resistance. The findings regarding NEDD4 functions are further supported by knockout mouse models and human tumor tissue studies. This review could provide a promising and optimum anticancer therapeutic strategy via targeting the NEDD4 protein.
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Affiliation(s)
- Zhi-Wei Wang
- Center of Scientific Research, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China; Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
| | - Xiaoli Hu
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Miaomiao Ye
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Min Lin
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Man Chu
- Center of Scientific Research, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Xian Shen
- Department of Gastrointestinal Surgery, the Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China.
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8
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Dybas JM, O'Leary CE, Ding H, Spruce LA, Seeholzer SH, Oliver PM. Integrative proteomics reveals an increase in non-degradative ubiquitylation in activated CD4 + T cells. Nat Immunol 2019; 20:747-755. [PMID: 31061531 DOI: 10.1038/s41590-019-0381-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 03/20/2019] [Indexed: 11/09/2022]
Abstract
Despite gathering evidence that ubiquitylation can direct non-degradative outcomes, most investigations of ubiquitylation in T cells have focused on degradation. Here, we integrated proteomic and transcriptomic datasets from primary mouse CD4+ T cells to establish a framework for predicting degradative or non-degradative outcomes of ubiquitylation. Di-glycine remnant profiling was used to reveal ubiquitylated proteins, which in combination with whole-cell proteomic and transcriptomic data allowed prediction of protein degradation. Analysis of ubiquitylated proteins identified by di-glycine remnant profiling indicated that activation of CD4+ T cells led to an increase in non-degradative ubiquitylation. This correlated with an increase in non-proteasome-targeted K29, K33 and K63 polyubiquitin chains. This study revealed over 1,200 proteins that were ubiquitylated in primary mouse CD4+ T cells and highlighted the relevance of non-proteasomally targeted ubiquitin chains in T cell signaling.
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Affiliation(s)
- Joseph M Dybas
- Division of Protective Immunity, Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Cell Pathology Division, Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Claire E O'Leary
- Cell Pathology Division, Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Hua Ding
- Cell Pathology Division, Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Lynn A Spruce
- Cell Pathology Division, Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Steven H Seeholzer
- Cell Pathology Division, Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Paula M Oliver
- Division of Protective Immunity, Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, USA. .,Cell Pathology Division, Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, USA. .,Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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9
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Tang R, Langdon WY, Zhang J. Regulation of immune responses by E3 ubiquitin ligase Cbl-b. Cell Immunol 2018; 340:103878. [PMID: 30442330 DOI: 10.1016/j.cellimm.2018.11.002] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 11/04/2018] [Accepted: 11/05/2018] [Indexed: 12/21/2022]
Abstract
Casitas B lymphoma-b (Cbl-b), a RING finger E3 ubiquitin ligase, has been identified as a critical regulator of adaptive immune responses. Cbl-b is essential for establishing the threshold for T cell activation and regulating peripheral T cell tolerance through various mechanisms. Intriguingly, recent studies indicate that Cbl-b also modulates innate immune responses, and plays a key role in host defense to pathogens and anti-tumor immunity. These studies suggest that targeting Cbl-b may represent a potential therapeutic strategy for the management of human immune-related disorders such as autoimmune diseases, infections, tumors, and allergic airway inflammation. In this review, we summarize the latest developments regarding the roles of Cbl-b in innate and adaptive immunity, and immune-mediated diseases.
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Affiliation(s)
- Rong Tang
- Department of Nephrology, Xiangya Hospital, Central South University, Changsha, Hunan, PR China
| | - Wallace Y Langdon
- School of Biological Sciences, University of Western Australia, Perth, Australia
| | - Jian Zhang
- Department of Pathology, The University of Iowa, Iowa City, IA, USA.
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10
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Shao G, Wang R, Sun A, Wei J, Peng K, Dai Q, Yang W, Lin Q. The E3 ubiquitin ligase NEDD4 mediates cell migration signaling of EGFR in lung cancer cells. Mol Cancer 2018; 17:24. [PMID: 29455656 PMCID: PMC5817799 DOI: 10.1186/s12943-018-0784-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 02/01/2018] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND EGFR-dependent cell migration plays an important role in lung cancer progression. Our previous study observed that the HECT E3 ubiquitin ligase NEDD4 is significantly correlated with tumor metastasis and required for migration and invasion signaling of EGFR in gastric cancer cells. However, how NEDD4 promotes the EGFR-dependent lung cancer cell migration is unknown. This study is to elucidate the mechanism by which NEDD4 mediates the EGFR lung cancer migration signaling. METHODS Lentiviral vector-loaded NEDD4 shRNA was used to deplete endogenous NEDD4 in lung cancer cell lines. Effects of the NEDD4 knockdown on the EGFR-dependent or independent lung cancer cell migration were determined using the wound-healing and transwell assays. Association of NEDD4 with activated EGFR was assayed by co-immunoprecipitation. Co-expression of NEDD4 with EGFR or PTEN was determined by immunohistochemical (IHC) staining in 63 lung adenocarcinoma tissue samples. Effects of NEDD4 ectopic expression or knockdown on PTEN ubiquitination and down-regulation, AKT activation and lysosomal secretion were examined using the GST-Uba pulldown assay, immunoblotting, immunofluorescent staining and a human cathepsin B ELISA assay respectively. The specific cathepsin B inhibitor CA-074Me was used for assessing the role of cathepsin B in lung cancer cell migration. RESULTS Knockdown of NEDD4 significantly reduced EGF-stimulated cell migration in non-small cell lung carcinoma (NSCLC) cells. Co-immunoprecipitation assay found that NEDD4 is associated with EGFR complex upon EGF stimulation, and IHC staining indicates that NEDD4 is co-expressed with EGFR in lung adenocarcinoma tumor tissues, suggesting that NEDD4 might mediate lung cancer cell migration by interaction with the EGFR signaling complex. Interestingly, NEDD4 promotes the EGF-induced cathepsin B secretion, possibly through lysosomal exocytosis, as overexpression of the ligase-dead mutant of NEDD4 impedes lysosomal secretion, and knockdown of NEDD4 significantly reduced extracellular amount of cathepsin B induced by EGF. Consistent with the role of NEDD4, cathepsin B is pivotal for both basal and the EGF-stimulated lung cancer cell migration. Our studies propose a novel mechanism underlying the EGFR-promoted lung cancer cell migration that is mediated by NEDD4 through regulation of cathepsin B secretion. CONCLUSION NEDD4 mediates the EGFR lung cancer cell migration signaling through promoting lysosomal secretion of cathepsin B.
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Affiliation(s)
- Genbao Shao
- School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Ranran Wang
- School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Aiqin Sun
- School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Jing Wei
- School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Ke Peng
- School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Qian Dai
- School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Wannian Yang
- School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Qiong Lin
- School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.
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11
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Tran CW, Saibil SD, Le Bihan T, Hamilton SR, Lang KS, You H, Lin AE, Garza KM, Elford AR, Tai K, Parsons ME, Wigmore K, Vainberg MG, Penninger JM, Woodgett JR, Mak TW, Ohashi PS. Glycogen Synthase Kinase-3 Modulates Cbl-b and Constrains T Cell Activation. THE JOURNAL OF IMMUNOLOGY 2017; 199:4056-4065. [DOI: 10.4049/jimmunol.1600396] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 10/05/2017] [Indexed: 11/19/2022]
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12
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Liu Q, Zhang S, Chen G, Zhou H. E3 ubiquitin ligase Nedd4 inhibits AP-1 activity and TNF-α production through targeting p38α for polyubiquitination and subsequent degradation. Sci Rep 2017; 7:4521. [PMID: 28674435 PMCID: PMC5495757 DOI: 10.1038/s41598-017-04072-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 05/09/2017] [Indexed: 11/16/2022] Open
Abstract
p38α plays an important role in many inflammatory diseases, such as skin inflammation, endotoxic shock and arthritis. Ubiquitination is a vital posttranslational modification of proteins and plays a crucial regulatory role in inflammatory cells. It has been reported that ubiquitination of Tak1 and TAB1 upstream of p38α can regulate p38α activation respectively. However, p38α ubiquitination is not yet clear. In this paper, we showed that E3 ubiquitin ligase Nedd4 is a regulatory component of the p38α pathway and is responsible for polyubiquitination of p38α through K48-linked and K63-linked polyubiquitination. The levels of p38α and its downstream target TNF-α were increased in Nedd4 deficient macrophages response to LPS compared with wild-type cells. AP-1 activity and degradation of p38α were induced by Nedd4 in a dose-dependent manner. Furthermore, we found that phosphorylation of p38α is involved in the interactions between p38α and Nedd4 and subsequently promotes polyubiquitination of p38α, especially K48-linked polyubiquitination by Nedd4. The different conformation of two p38α isoforms (p38αV1 and p38αV2) might be the cause of their different interactions with Nedd4 and their polyubiquitination sites by Nedd4. Thus, NEDD4 is a previously unknown component of the p38α signaling complex necessary for TNF-α activation.
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Affiliation(s)
- Qingjun Liu
- Beijing Institute of Transfusion Medicine, Beijing Key Laboratory of Blood Safety and Supply Technologies, Taiping Road 27, 100850, Beijing, P.R. China.
| | - Shihui Zhang
- Beijing Institute of Transfusion Medicine, Beijing Key Laboratory of Blood Safety and Supply Technologies, Taiping Road 27, 100850, Beijing, P.R. China
| | - Gan Chen
- Beijing Institute of Transfusion Medicine, Beijing Key Laboratory of Blood Safety and Supply Technologies, Taiping Road 27, 100850, Beijing, P.R. China
| | - Hong Zhou
- Beijing Institute of Transfusion Medicine, Beijing Key Laboratory of Blood Safety and Supply Technologies, Taiping Road 27, 100850, Beijing, P.R. China.
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13
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Deubiquitylating enzymes in receptor endocytosis and trafficking. Biochem J 2017; 473:4507-4525. [PMID: 27941029 DOI: 10.1042/bcj20160826] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 09/15/2016] [Accepted: 09/16/2016] [Indexed: 12/25/2022]
Abstract
In recent times, our knowledge of the roles ubiquitin plays in multiple cellular processes has expanded exponentially, with one example being the role of ubiquitin in receptor endocytosis and trafficking. This has prompted a multitude of studies examining how the different machinery involved in the addition and removal of ubiquitin can influence this process. Multiple deubiquitylating enzymes (DUBs) have been implicated either in facilitating receptor endocytosis and lysosomal degradation or in rescuing receptor levels by preventing endocytosis and/or promoting recycling to the plasma membrane. In this review, we will discuss in detail what is currently known about the role of DUBs in regulating the endocytosis of various transmembrane receptors and ion channels. We will also expand upon the role DUBs play in receptor sorting at the multivesicular body to determine whether a receptor is recycled or trafficked to the lysosome for degradation. Finally, we will briefly discuss how the DUBs implicated in these processes may contribute to the pathogenesis of a range of diseases, and thus the potential these have as therapeutic targets.
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14
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Zhang Y, Wang W, Cai S, Chen Y, Wang Q, Pan Q, Sun F, Wang J. Reciprocal regulation between βTrCP and Smurf1 suppresses proliferative capacity of liver cancer cells. J Cell Physiol 2017; 232:3347-3359. [PMID: 28063214 DOI: 10.1002/jcp.25780] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 01/04/2017] [Accepted: 01/05/2017] [Indexed: 12/30/2022]
Abstract
We previously reported that both the ubiquitin E3 ligases βTrCP (beta-transducin repeat-containing E3 ubiquitin protein ligase) and Smurf1 (SMAD-specific E3 ubiquitin protein ligase 1) play similar antitumorigenic roles in liver cancer cells. However, whether and how they are reciprocally regulated remains elusive. Here, we show that βTrCP interacts with Smurf1 through the 7 × tryptophan (W) aspartic acid (D)(WD) 40 and the region homologous to the E6-AP carboxyl terminus (HECT) domains, which are the E3 ligase domains of βTrCP and Smurf1, respectively. The E3 ligase domains of βTrCP and Smurf1 are also critical for maintaining the protein expressions of Smurf1 and βTrCP. Moreover, a positive correlation between βTrCP and Smurf1 was also revealed by tissue microarray analysis, indicating that this relationship might be important in liver cancer. Further, we found that Smurf1 increases the protein stability of βTrCP, possibly by reducing autoubiquitination of βTrCP, and vice versa. Interestingly, such effects depended on the presence of E3 ligase domains. Importantly, depletion of Smurf1- or βTrCP-enhanced proliferative capacity of liver cancer cells could be partially reversed by overexpression of wild-type βTrCP or Smurf1 but not their E3 ligase-dead mutants. Collectively, a reciprocal post-translational regulation between βTrCP and Smurf1 has been uncovered in this study. Simultaneous enhancement of βTrCP and Smurf1 functions might be helpful in the treatment of liver cancer.
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Affiliation(s)
- Yue Zhang
- Department of Central Laboratory, Shanghai Tenth People's Hospital of Tongji University, Shanghai, China
| | - Wenhua Wang
- Department of Neurosurgery, Shanghai Tenth People's Hospital of Tongji University, Shanghai, China
| | - Si Cai
- Department of Laboratory Medicine, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yan Chen
- Department of Clinical Laboratory Medicine, Shanghai Tenth People's Hospital of Tongji University, Shanghai, China
| | - Qinwan Wang
- Department of Central Laboratory, Shanghai Tenth People's Hospital of Tongji University, Shanghai, China
| | - Qiuhui Pan
- Department of Central Laboratory, Shanghai Tenth People's Hospital of Tongji University, Shanghai, China
| | - Fenyong Sun
- Department of Clinical Laboratory Medicine, Shanghai Tenth People's Hospital of Tongji University, Shanghai, China
| | - Jiayi Wang
- Department of Clinical Laboratory Medicine, Shanghai Tenth People's Hospital of Tongji University, Shanghai, China.,Advanced Institute of Translational Medicine, Tongji University, Shanghai, China
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15
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Sun A, Wei J, Childress C, Shaw JH, Peng K, Shao G, Yang W, Lin Q. The E3 ubiquitin ligase NEDD4 is an LC3-interactive protein and regulates autophagy. Autophagy 2017; 13:522-537. [PMID: 28085563 DOI: 10.1080/15548627.2016.1268301] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The MAP1LC3/LC3 family plays an essential role in autophagosomal biogenesis and transport. In this report, we show that the HECT family E3 ubiquitin ligase NEDD4 interacts with LC3 and is involved in autophagosomal biogenesis. NEDD4 binds to LC3 through a conserved WXXL LC3-binding motif in a region between the C2 and the WW2 domains. Knockdown of NEDD4 impaired starvation- or rapamycin-induced activation of autophagy and autophagosomal biogenesis and caused aggregates of the LC3 puncta colocalized with endoplasmic reticulum membrane markers. Electron microscopy observed gigantic deformed mitochondria in NEDD4 knockdown cells, suggesting that NEDD4 might function in mitophagy. Furthermore, SQSTM1 is ubiquitinated by NEDD4 while LC3 functions as an activator of NEDD4 ligase activity. Taken together, our studies define an important role of NEDD4 in regulation of autophagy.
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Affiliation(s)
- Aiqin Sun
- a School of Medicine, Jiangsu University , Zhenjiang , China
| | - Jing Wei
- a School of Medicine, Jiangsu University , Zhenjiang , China
| | - Chandra Childress
- b Department of Biology , Susquehanna University , Selinsgrove , PA , USA
| | - John H Shaw
- c Department of Pathology , Geisinger Clinic , Danville , PA , USA
| | - Ke Peng
- a School of Medicine, Jiangsu University , Zhenjiang , China
| | - Genbao Shao
- a School of Medicine, Jiangsu University , Zhenjiang , China
| | - Wannian Yang
- a School of Medicine, Jiangsu University , Zhenjiang , China
| | - Qiong Lin
- a School of Medicine, Jiangsu University , Zhenjiang , China
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16
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Nadeau SA, An W, Mohapatra BC, Mushtaq I, Bielecki TA, Luan H, Zutshi N, Ahmad G, Storck MD, Sanada M, Ogawa S, Band V, Band H. Structural Determinants of the Gain-of-Function Phenotype of Human Leukemia-associated Mutant CBL Oncogene. J Biol Chem 2017; 292:3666-3682. [PMID: 28082680 DOI: 10.1074/jbc.m116.772723] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Indexed: 01/19/2023] Open
Abstract
Mutations of the tyrosine kinase-directed ubiquitin ligase CBL cause myeloid leukemias, but the molecular determinants of the dominant leukemogenic activity of mutant CBL oncogenes are unclear. Here, we first define a gain-of-function attribute of the most common leukemia-associated CBL mutant, Y371H, by demonstrating its ability to increase proliferation of hematopoietic stem/progenitor cells (HSPCs) derived from CBL-null and CBL/CBL-B-null mice. Next, we express second-site point/deletion mutants of CBL-Y371H in CBL/CBL-B-null HSPCs or the cytokine-dependent human leukemic cell line TF-1 to show that individual or combined Tyr → Phe mutations of established phosphotyrosine residues (Tyr-700, Tyr-731, and Tyr-774) had little impact on the activity of the CBL-Y371H mutant in HSPCs, and the triple Tyr → Phe mutant was only modestly impaired in TF-1 cells. In contrast, intact tyrosine kinase-binding (TKB) domain and proline-rich region (PRR) were critical in both cell models. PRR deletion reduced the stem cell factor (SCF)-induced hyper-phosphorylation of the CBL-Y371H mutant and the c-KIT receptor and eliminated the sustained p-ERK1/2 and p-AKT induction by SCF. GST fusion protein pulldowns followed by phospho-specific antibody array analysis identified distinct CBL TKB domains or PRR-binding proteins that are phosphorylated in CBL-Y371H-expressing TF-1 cells. Our results support a model of mutant CBL gain-of-function in which mutant CBL proteins effectively compete with the remaining wild type CBL-B and juxtapose TKB domain-associated PTKs with PRR-associated signaling proteins to hyper-activate signaling downstream of hematopoietic growth factor receptors. Elucidation of mutant CBL domains required for leukemogenesis should facilitate targeted therapy approaches for patients with mutant CBL-driven leukemias.
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Affiliation(s)
- Scott A Nadeau
- From the Eppley Institute for Research in Cancer and Allied Diseases.,the Departments of Genetics, Cell Biology and Anatomy
| | - Wei An
- From the Eppley Institute for Research in Cancer and Allied Diseases.,the Departments of Genetics, Cell Biology and Anatomy
| | - Bhopal C Mohapatra
- From the Eppley Institute for Research in Cancer and Allied Diseases.,Biochemistry and Molecular Biology
| | - Insha Mushtaq
- From the Eppley Institute for Research in Cancer and Allied Diseases.,Pathology and Microbiology, College of Medicine, and
| | | | - Haitao Luan
- From the Eppley Institute for Research in Cancer and Allied Diseases.,the Departments of Genetics, Cell Biology and Anatomy
| | - Neha Zutshi
- From the Eppley Institute for Research in Cancer and Allied Diseases.,Pathology and Microbiology, College of Medicine, and
| | - Gulzar Ahmad
- From the Eppley Institute for Research in Cancer and Allied Diseases
| | - Matthew D Storck
- From the Eppley Institute for Research in Cancer and Allied Diseases
| | - Masashi Sanada
- the Department of Pathology and Tumor Biology, Kyoto University, Yoshida-Konoe-Cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Seishi Ogawa
- the Department of Pathology and Tumor Biology, Kyoto University, Yoshida-Konoe-Cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Vimla Band
- From the Eppley Institute for Research in Cancer and Allied Diseases.,the Departments of Genetics, Cell Biology and Anatomy.,the Fred and Pamela Buffet Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198 and
| | - Hamid Band
- From the Eppley Institute for Research in Cancer and Allied Diseases, .,the Departments of Genetics, Cell Biology and Anatomy.,Biochemistry and Molecular Biology.,Pathology and Microbiology, College of Medicine, and.,the Fred and Pamela Buffet Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198 and
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17
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RNF122 suppresses antiviral type I interferon production by targeting RIG-I CARDs to mediate RIG-I degradation. Proc Natl Acad Sci U S A 2016; 113:9581-6. [PMID: 27506794 DOI: 10.1073/pnas.1604277113] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The activation of retinoic acid-inducible gene 1 (RIG-I), a cytoplasmic innate sensor for viral RNA, is tightly regulated to maintain immune homeostasis properly and prevent excessive inflammatory reactions other than initiation of antiviral innate response to eliminate RNA virus effectively. Posttranslational modifications, particularly ubiquitination, are crucial for regulation of RIG-I activity. Increasing evidence suggests that E3 ligases play important roles in various cellular processes, including cell proliferation and antiviral innate signaling. Here we identify that E3 ubiquitin ligase RING finger protein 122 (RNF122) directly interacts with mouse RIG-I through MS screening of RIG-I-interacting proteins in RNA virus-infected cells. The transmembrane domain of RNF122 associates with the caspase activation and recruitment domains (CARDs) of RIG-I; this interaction effectively triggers RING finger domain of RNF122 to deliver the Lys-48-linked ubiquitin to the Lys115 and Lys146 residues of RIG-I CARDs and promotes RIG-I degradation, resulting in a marked inhibition of RIG-I downstream signaling. RNF122 is widely expressed in various immune cells, with preferential expression in macrophages. Deficiency of RNF122 selectively increases RIG-I-triggered production of type I IFNs and proinflammatory cytokines in macrophages. RNF122-deficient mice exhibit more resistance against lethal RNA virus infection, with increased production of type I IFNs. Thus, we demonstrate that RNF122 acts as a selective negative regulator of RIG-I-triggered antiviral innate response by targeting CARDs of RIG-I and mediating proteasomal degradation of RIG-I. Our study outlines a way for E3 ligase to regulate innate sensor RIG-I for the control of antiviral innate immunity.
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18
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Abstract
Itch or itchy E3 ubiquitin ligase was initially discovered by genetic studies on the mouse coat color changes, and its deletion results in an itchy phenotype with constant skin scratching and multi-organ inflammation. It is a member of the homologous to E6-associated protein C-terminus (HECT)-type family of E3 ligases, with the protein-interacting WW-domains for the recruitment of substrate and the HECT domain for the transfer of ubiquitin to the substrate. Since its discovery, numerous studies have demonstrated that Itch is involved in the control of many aspects of immune responses including T-cell activation and tolerance and T-helper cell differentiation. Itch is also implicated in other biological contexts such as tumorigenesis, development, and stress responses. Many signaling pathways are regulated by Itch-promoted ubiquitylation of diverse target proteins. Itch is also involved in human diseases. Here, we discuss the major progress in understanding the biological significance of Itch-promoted protein ubiquitylation in the immune and other systems and in Itch-mediated regulation of signal transduction.
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Affiliation(s)
- Daisuke Aki
- Institute for Immunology, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China.,Division of Cell Biology, La Jolla Institute for Allergy and Immunology, La Jolla, CA, USA
| | - Wen Zhang
- Institute for Immunology, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
| | - Yun-Cai Liu
- Institute for Immunology, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China.,Division of Cell Biology, La Jolla Institute for Allergy and Immunology, La Jolla, CA, USA
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19
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Seong MW, Ka SH, Park JH, Park JH, Yoo HM, Yang SW, Park JM, Park D, Lee ST, Seol JH, Chung CH. Deleterious c-Cbl Exon Skipping Contributes to Human Glioma. Neoplasia 2016; 17:518-24. [PMID: 26152360 PMCID: PMC4719003 DOI: 10.1016/j.neo.2015.06.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 06/02/2015] [Accepted: 06/08/2015] [Indexed: 11/29/2022] Open
Abstract
c-Cbl, a RING-type ubiquitin E3 ligase, downregulates various receptor tyrosine kinases (e.g., epidermal growth factor receptor (EGFR)), leading to inhibition of cell proliferation. Moreover, patients with myeloid neoplasm frequently harbor c-Cbl mutations, implicating the role of c-Cbl as a tumor suppressor. Recently, we have shown that c-Cbl downregulates αPix-mediated cell migration and invasion, and the lack of c-Cbl in the rat C6 and human A172 glioma cells is responsible for their malignant behavior. Here, we showed that c-Cbl exon skipping occurs in the glioma cells and the brain tissues from glioblastoma patients lacking c-Cbl. This exon skipping resulted in generation of two types of c-Cbl isoforms: type I lacking exon-9 and type II lacking exon-9 and exon-10. However, the c-Cbl isoforms in the cells and tissues could not be detected as they were rapidly degraded by proteasome. Consequently, C6 and A172 cells showed sustained EGFR activation. However, no splice site mutation was found in the region from exon-7 to exon-11 of the c-Cbl gene in C6 cells and a glioblastoma tissue lacking c-Cbl. In addition, c-Cbl exon skipping could be induced when cells transfected with a c-Cbl mini-gene were grown to high density or under hypoxic stress. These results suggest that unknown alternations (e.g., mutation) of splicing machinery in C6 and A172 cells and the glioblastoma brain tissues are responsible for the deleterious exon skipping. Collectively, these findings indicate that the c-Cbl exon skipping contributes to human glioma and its malignant behavior.
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Affiliation(s)
- Min Woo Seong
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea
| | - Seung Hyeun Ka
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea
| | - Ji Ho Park
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea
| | - Jong Ho Park
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea
| | - Hee Min Yoo
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea
| | - Seung Wook Yang
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea
| | - Jung Mi Park
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea
| | - Dongeun Park
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea
| | - Soon Tae Lee
- Department of Neurology, Seoul National University Hospital, Seoul, Korea
| | - Jae Hong Seol
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea.
| | - Chin Ha Chung
- School of Biological Sciences and Institute for Protein Metabolism and Diseases, College of Natural Sciences, Seoul National University, Seoul, Korea.
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20
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Mukherjee R, Chakrabarti O. Ubiquitin mediated regulation of the E3 ligase GP78 by Mahogunin in trans affects mitochondrial homeostasis. J Cell Sci 2016; 129:757-73. [DOI: 10.1242/jcs.176537] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 12/29/2015] [Indexed: 12/29/2022] Open
Abstract
Cellular quality control provides an efficient surveillance system to regulate mitochondrial turn-over. This study elucidates a novel interaction of the cytosolic E3 ligase, MGRN1 with the ER ubiquitin E3 ligase, GP78. Loss of Mgrn1 function has been implicated in late-onset spongiform neurodegeneration, congenital heart defects amongst several developmental defects. MGRN1 ubiquitinates GP78 in trans via non-canonical K11 linkages. This helps maintain constitutively low levels of GP78 in healthy cells, in turn downregulating mitophagy. GP78, however, does not regulate MGRN1. When mitochondria are stressed, cytosolic Ca2+ increases.This leads to reduced interaction between MGRN1 and GP78 and its compromised ubiquitination. Chelating Ca2+ restores association between the two ligases and the trans ubiquitination. Catalytic inactivation of MGRN1 results in elevated levels of GP78 and consequential increase in the initiation of mitophagy. This is significant because functional depletion of MGRN1 by membrane-associated disease causing prion protein, CtmPrP affects polyubiquitination and degradation of GP78, also leading to an increase in mitophagy events. This suggests that MGRN1 participates in mitochondrial quality control and could contribute to neurodegeneration in a sub-set of CtmPrP mediated prion diseases.
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Affiliation(s)
- Rukmini Mukherjee
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata – 700064, India
| | - Oishee Chakrabarti
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata – 700064, India
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21
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Chapter Five - Ubiquitination of Ion Channels and Transporters. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2016; 141:161-223. [DOI: 10.1016/bs.pmbts.2016.02.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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22
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Smith G, Tomlinson D, Harrison M, Ponnambalam S. Chapter Eight - Ubiquitin-Mediated Regulation of Cellular Responses to Vascular Endothelial Growth Factors. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2016; 141:313-38. [DOI: 10.1016/bs.pmbts.2016.02.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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23
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Desrochers G, Lussier-Price M, Omichinski JG, Angers A. Multiple Src Homology 3 Binding to the Ubiquitin Ligase Itch Conserved Proline-Rich Region. Biochemistry 2015; 54:7345-54. [PMID: 26613292 DOI: 10.1021/acs.biochem.5b01131] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Itch is a member of the C2-WW-HECT (CWH) family of ubiquitin ligases involved in the control of inflammatory signaling pathways, several transcription factors, and sorting of surface receptors to the degradative pathway. In addition to these common domains, Itch also contains a conserved proline-rich region (PRR) allowing its interaction with Src homology 3 (SH3) domain-containing proteins. This region is composed of 20 amino acids and contains one consensus class I and three class II SH3-binding motifs. Several SH3 domain-containing partners have been shown to recognize the Itch PRR, but their binding properties have been poorly defined. Here we compare a subset of endocytic SH3 domain-containing proteins using bioluminescence resonance energy transfer, isothermal titration calorimetry, and pull-down assays. Results indicate that Endophilin is a high-affinity binding partner of Itch both in vivo and in vitro, with a calculated KD placing this complex among the highest-affinity SH3 domain-mediated interactions reported to date. All of the SH3 domains tested here bind to Itch with a 1:1 stoichiometry, except for β-PIX that binds with a 2:1 stoichiometry. Together, these results indicate that Itch PRR is a versatile binding module that can accommodate several different SH3 domain-containing proteins but has a preference for Endophilin. Interestingly, the catalytic activity of Itch toward different SH3 domain-containing proteins was similar, except for β-PIX that was not readily ubiquitylated even though it could interact with an affinity comparable to those of other substrates tested.
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Affiliation(s)
- Guillaume Desrochers
- Department of Biological Sciences and ‡Department of Biochemistry and Molecular Medicine, University of Montreal , Montreal, Quebec H3C 3J7, Canada
| | - Mathieu Lussier-Price
- Department of Biological Sciences and ‡Department of Biochemistry and Molecular Medicine, University of Montreal , Montreal, Quebec H3C 3J7, Canada
| | - James G Omichinski
- Department of Biological Sciences and ‡Department of Biochemistry and Molecular Medicine, University of Montreal , Montreal, Quebec H3C 3J7, Canada
| | - Annie Angers
- Department of Biological Sciences and ‡Department of Biochemistry and Molecular Medicine, University of Montreal , Montreal, Quebec H3C 3J7, Canada
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24
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O'Leary CE, Lewis EL, Oliver PM. Ubiquitylation as a Rheostat for TCR Signaling: From Targeted Approaches Toward Global Profiling. Front Immunol 2015; 6:618. [PMID: 26732666 PMCID: PMC4679856 DOI: 10.3389/fimmu.2015.00618] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 11/26/2015] [Indexed: 12/24/2022] Open
Abstract
T cell receptor (TCR) signaling must be precisely tuned to limit collateral damage and prevent reactivity to self, while still allowing robust protective immune responses that control pathogen invasion. One process that can be used to promote, modify, or terminate TCR signaling is ubiquitylation. During ubiquitylation, ubiquitin is covalently attached to target proteins through a multistep process, in which E3 ubiquitin ligases promote the formation of ubiquitin chains on selected substrates. Ubiquitylation can facilitate protein–protein interactions, direct a protein to a specific subcellular location, or initiate protein destruction. Like phosphorylation, ubiquitylation is a reversible process – deubiquitylating enzymes counteract ligase function by removing ubiquitin chains. This reversibility also allows for ubiquitin chain “editing.” Based on an emerging wealth of information from genetic loss-of-function studies showing that deregulation of ubiquitylation pathways leads to immune dysfunction, it has become increasingly apparent that the dynamic process of ubiquitylation is critical for normal immune cell function. In this review, we will describe how ubiquitylation acts as a key modulator and integrator of signaling downstream of TCR engagement. Specifically, we highlight the known roles of the substrate-specific E3 ligases and deubiquitylating enzymes in TCR signaling and T cell activation. While it is clear that ubiquitin enzymes tune T cell signaling and T cell function, elucidating the molecular mechanisms by which these proteins modulate T cells has met with significant challenges. Identifying substrates of these enzymes has been a particular challenge, and thus substrates of many E3 ligases and deubiquitylating enzymes remain largely unknown. To that end, we discuss the promise, and some practical considerations, of using proteomics-based techniques for unbiased identification of putative substrates of ubiquitin cascade proteins within primary T cells. These methods provide an exciting opportunity for further defining how TCR signals are regulated and for identifying new targets for therapeutic modulation.
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Affiliation(s)
- Claire E O'Leary
- Perelman School of Medicine, University of Pennsylvania , Philadelphia, PA , USA
| | - Emma L Lewis
- Perelman School of Medicine, University of Pennsylvania , Philadelphia, PA , USA
| | - Paula M Oliver
- Perelman School of Medicine, University of Pennsylvania , Philadelphia, PA , USA
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25
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O'Connor HF, Lyon N, Leung JW, Agarwal P, Swaim CD, Miller KM, Huibregtse JM. Ubiquitin-Activated Interaction Traps (UBAITs) identify E3 ligase binding partners. EMBO Rep 2015; 16:1699-712. [PMID: 26508657 DOI: 10.15252/embr.201540620] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 08/28/2015] [Indexed: 12/27/2022] Open
Abstract
We describe a new class of reagents for identifying substrates, adaptors, and regulators of HECT and RING E3s. UBAITs (Ubiquitin-Activated Interaction Traps) are E3-ubiquitin fusion proteins and, in an E1- and E2-dependent manner, the C-terminal ubiquitin moiety forms an amide linkage to proteins that interact with the E3, enabling covalent co-purification of the E3 with partner proteins. We designed UBAITs for both HECT (Rsp5, Itch) and RING (Psh1, RNF126, RNF168) E3s. For HECT E3s, trapping of interacting proteins occurred in vitro either through an E3 thioester-linked lariat intermediate or through an E2 thioester intermediate, and both WT and active-site mutant UBAITs trapped known interacting proteins in yeast and human cells. Yeast Psh1 and human RNF126 and RNF168 UBAITs also trapped known interacting proteins when expressed in cells. Human RNF168 is a key mediator of ubiquitin signaling that promotes DNA double-strand break repair. Using the RNF168 UBAIT, we identify H2AZ--a histone protein involved in DNA repair--as a new target of this E3 ligase. These results demonstrate that UBAITs represent powerful tools for profiling a wide range of ubiquitin ligases.
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Affiliation(s)
- Hazel F O'Connor
- Department of Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX, USA
| | - Nancy Lyon
- Department of Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX, USA
| | - Justin W Leung
- Department of Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX, USA
| | - Poonam Agarwal
- Department of Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX, USA
| | - Caleb D Swaim
- Department of Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX, USA
| | - Kyle M Miller
- Department of Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX, USA
| | - Jon M Huibregtse
- Department of Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX, USA
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Kharitidi D, Apaja PM, Manteghi S, Suzuki K, Malitskaya E, Roldan A, Gingras MC, Takagi J, Lukacs GL, Pause A. Interplay of Endosomal pH and Ligand Occupancy in Integrin α5β1 Ubiquitination, Endocytic Sorting, and Cell Migration. Cell Rep 2015; 13:599-609. [PMID: 26456826 DOI: 10.1016/j.celrep.2015.09.024] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 07/30/2015] [Accepted: 09/04/2015] [Indexed: 01/18/2023] Open
Abstract
Membrane trafficking of integrins plays a pivotal role in cell proliferation and migration. How endocytosed integrins are targeted either for recycling or lysosomal delivery is not fully understood. Here, we show that fibronectin (FN) binding to α5β1 integrin triggers ubiquitination and internalization of the receptor complex. Acidification facilitates FN dissociation from integrin α5β1 in vitro and in early endosomes, promoting receptor complex deubiquitination by the USP9x and recycling to the cell surface. Depending on residual ligand occupancy of receptors, some α5β1 integrins remain ubiquitinated and are captured by ESCRT-0/I, containing histidine domain-containing protein tyrosine phosphatase (HD-PTP) and ubiquitin-associated protein 1 (UBAP1), and are directed for lysosomal proteolysis, limiting receptor downstream signaling and cell migration. Thus, HD-PTP or UBAP1 depletion confers a pro-invasive phenotype. Thus, pH-dependent FN-integrin dissociation and deubiquitination of the activated integrin α5β1 are required for receptor resensitization and cell migration, representing potential targets to modulate tumor invasiveness.
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Affiliation(s)
- Dmitri Kharitidi
- Department of Biochemistry, Goodman Cancer Research Centre, McGill University, Montreal, Canada, H3G 1Y6
| | - Pirjo M Apaja
- Department of Physiology and Research Group Focused on Protein Structure, McGill University, Montreal, Canada, H3G 1Y6
| | - Sanaz Manteghi
- Department of Biochemistry, Goodman Cancer Research Centre, McGill University, Montreal, Canada, H3G 1Y6
| | - Kei Suzuki
- Laboratory of Protein Synthesis and Expression, Institute for Protein Research, Osaka University, Osaka 565-0871, Japan
| | - Elena Malitskaya
- Department of Biochemistry, Goodman Cancer Research Centre, McGill University, Montreal, Canada, H3G 1Y6
| | - Ariel Roldan
- Department of Physiology and Research Group Focused on Protein Structure, McGill University, Montreal, Canada, H3G 1Y6
| | - Marie-Claude Gingras
- Department of Biochemistry, Goodman Cancer Research Centre, McGill University, Montreal, Canada, H3G 1Y6
| | - Junichi Takagi
- Laboratory of Protein Synthesis and Expression, Institute for Protein Research, Osaka University, Osaka 565-0871, Japan
| | - Gergely L Lukacs
- Department of Biochemistry, Goodman Cancer Research Centre, McGill University, Montreal, Canada, H3G 1Y6; Department of Physiology and Research Group Focused on Protein Structure, McGill University, Montreal, Canada, H3G 1Y6.
| | - Arnim Pause
- Department of Biochemistry, Goodman Cancer Research Centre, McGill University, Montreal, Canada, H3G 1Y6.
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Xiao Y, Qiao G, Tang J, Tang R, Guo H, Warwar S, Langdon WY, Tao L, Zhang J. Protein Tyrosine Phosphatase SHP-1 Modulates T Cell Responses by Controlling Cbl-b Degradation. THE JOURNAL OF IMMUNOLOGY 2015; 195:4218-27. [PMID: 26416283 DOI: 10.4049/jimmunol.1501200] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 08/31/2015] [Indexed: 01/27/2023]
Abstract
Previously, we demonstrated that CD28 and CTLA-4 signaling control Casitas-B-lineage lymphoma (Cbl)-b protein expression, which is critical for T cell activation and tolerance induction. However, the molecular mechanism(s) of this regulation remains to be elucidated. In this study, we found that Cbl-b fails to undergo tyrosine phosphorylation upon CD3 stimulation because SHP-1 is recruited to and dephosphorylates Cbl-b, whereas CD28 costimulation abrogates this interaction. In support of this finding, T cells lacking SHP-1 display heightened tyrosine phosphorylation and ubiquitination of Cbl-b upon TCR stimulation, which correlates with decreased levels of Cbl-b protein. The aberrant Th2 phenotype observed in T cell-specific Shp1(-/-) mice is reminiscent of heightened Th2 response in Cblb(-/-) mice. Indeed, overexpressing Cbl-b in T cell-specific Shp1(-/-) T cells not only inhibits heightened Th2 differentiation in vitro, but also Th2 responses and allergic airway inflammation in vivo. Therefore, SHP-1 regulates Cbl-b-mediated T cell responses by controlling its tyrosine phosphorylation and ubiquitination.
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Affiliation(s)
- Yun Xiao
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH 43210; Department of Nephrology, Xiangya Hospital, Central South University, Changsha, 410008 Hunan, People's Republic of China; Department of Nephrology, The First Affiliated Hospital, Guangzhou Medical University, 510120 Guangzhou, People's Republic of China
| | - Guilin Qiao
- Section of Nephrology, Department of Medicine, The University of Chicago, Chicago, IL 60637; and
| | - Juan Tang
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH 43210; Department of Nephrology, Xiangya Hospital, Central South University, Changsha, 410008 Hunan, People's Republic of China
| | - Rong Tang
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH 43210; Department of Nephrology, Xiangya Hospital, Central South University, Changsha, 410008 Hunan, People's Republic of China
| | - Hui Guo
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH 43210
| | - Samantha Warwar
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH 43210
| | - Wallace Y Langdon
- School of Pathology and Laboratory Medicine, University of Western Australia, Perth, Western Australia 6009, Australia
| | - Lijian Tao
- Department of Nephrology, Xiangya Hospital, Central South University, Changsha, 410008 Hunan, People's Republic of China;
| | - Jian Zhang
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH 43210; Section of Nephrology, Department of Medicine, The University of Chicago, Chicago, IL 60637; and
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Chesarino NM, McMichael TM, Yount JS. E3 Ubiquitin Ligase NEDD4 Promotes Influenza Virus Infection by Decreasing Levels of the Antiviral Protein IFITM3. PLoS Pathog 2015; 11:e1005095. [PMID: 26263374 PMCID: PMC4532365 DOI: 10.1371/journal.ppat.1005095] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 07/17/2015] [Indexed: 01/17/2023] Open
Abstract
Interferon (IFN)-induced transmembrane protein 3 (IFITM3) is a cell-intrinsic factor that limits influenza virus infections. We previously showed that IFITM3 degradation is increased by its ubiquitination, though the ubiquitin ligase responsible for this modification remained elusive. Here, we demonstrate that the E3 ubiquitin ligase NEDD4 ubiquitinates IFITM3 in cells and in vitro. This IFITM3 ubiquitination is dependent upon the presence of a PPxY motif within IFITM3 and the WW domain-containing region of NEDD4. In NEDD4 knockout mouse embryonic fibroblasts, we observed defective IFITM3 ubiquitination and accumulation of high levels of basal IFITM3 as compared to wild type cells. Heightened IFITM3 levels significantly protected NEDD4 knockout cells from infection by influenza A and B viruses. Similarly, knockdown of NEDD4 in human lung cells resulted in an increase in steady state IFITM3 and a decrease in influenza virus infection, demonstrating a conservation of this NEDD4-dependent IFITM3 regulatory mechanism in mouse and human cells. Consistent with the known association of NEDD4 with lysosomes, we demonstrate for the first time that steady state turnover of IFITM3 occurs through the lysosomal degradation pathway. Overall, this work identifies the enzyme NEDD4 as a new therapeutic target for the prevention of influenza virus infections, and introduces a new paradigm for up-regulating cellular levels of IFITM3 independently of IFN or infection. IFITM3 is critical for limiting the severity of influenza virus infections in humans and mice. Optimal antiviral activity of IFITM3 is achieved when it is present at high levels within cells. Our results indicate that the E3 ubiquitin ligase NEDD4 decreases baseline IFITM3 levels by ubiquitinating IFITM3 and promoting its turnover. Depleting NEDD4 from cells results in IFITM3 accumulation and greater resistance to infection by influenza viruses. Therefore, we have identified NEDD4 as a regulator of IFITM3 levels and as a novel drug target for preventing influenza virus and other IFITM3-sensitive virus infections.
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Affiliation(s)
- Nicholas M. Chesarino
- Department of Microbial Infection and Immunity, Center for Microbial Interface Biology, The Ohio State University, Columbus, Ohio, United States of America
| | - Temet M. McMichael
- Department of Microbial Infection and Immunity, Center for Microbial Interface Biology, The Ohio State University, Columbus, Ohio, United States of America
| | - Jacob S. Yount
- Department of Microbial Infection and Immunity, Center for Microbial Interface Biology, The Ohio State University, Columbus, Ohio, United States of America
- * E-mail:
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Zou X, Levy-Cohen G, Blank M. Molecular functions of NEDD4 E3 ubiquitin ligases in cancer. Biochim Biophys Acta Rev Cancer 2015; 1856:91-106. [DOI: 10.1016/j.bbcan.2015.06.005] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 06/12/2015] [Accepted: 06/23/2015] [Indexed: 02/08/2023]
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30
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Zhou W, Xu J, Zhao Y, Sun Y. SAG/RBX2 is a novel substrate of NEDD4-1 E3 ubiquitin ligase and mediates NEDD4-1 induced chemosensitization. Oncotarget 2015; 5:6746-55. [PMID: 25216516 PMCID: PMC4196160 DOI: 10.18632/oncotarget.2246] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Sensitive to apoptosis gene (SAG), also known as RBX2, ROC2, or RNF7, is a RING component of SCF E3 ubiquitin ligases, which regulates cellular functions through ubiquitylation and degradation of many protein substrates. Although our previous studies showed that SAG is transcriptionally induced by redox, mitogen and hypoxia via AP-1 and HIF-1, it is completely unknown whether and how SAG is ubiquitylated and degraded. Here we report that NEDD4-1, a HECT domain-containing E3 ubiquitin ligase, binds via its HECT domain directly with SAG's C-terminal RING domain and ubiquitylates SAG for proteasome-mediated degradation. Consistently, SAG protein half-life is shortened or extended by NEDD4-1 overexpression or silencing, respectively. We also found that SAG bridges NEDD4-1 via its C-terminus and CUL-5 via its N-terminus to form a NEDD4-1/SAG/CUL-5 tri-complex. Biologically, NEDD4-1 overexpression sensitizes cancer cells to etoposide-induced apoptosis by reducing SAG levels through targeted degradation. Thus, SAG is added to a growing list of NEDD4-1 substrates and mediates its biological function.
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Affiliation(s)
- Weihua Zhou
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - Jie Xu
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - Yongchao Zhao
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - Yi Sun
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, MI. Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
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Ye X, Wang L, Shang B, Wang Z, Wei W. NEDD4: a promising target for cancer therapy. Curr Cancer Drug Targets 2015; 14:549-56. [PMID: 25088038 DOI: 10.2174/1568009614666140725092430] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 05/11/2014] [Accepted: 07/11/2014] [Indexed: 11/22/2022]
Abstract
The Neuronally expressed developmentally downregulated 4 (NEDD4), functioning largely as an E3 ubiquitin ligase, has been demonstrated to play a critical role in the development and progression of human cancers. In this review, to understand the regulatory mechanism(s) of NEDD4 as well as the signaling pathways controlled by NEDD4, we briefly describe the NEDD4 upstream regulators and its downstream ubiquitin substrates. Moreover, we further discuss its oncogenic roles in human malignancies. Therefore, targeting NEDD4 could be a potential therapeutic strategy for treatment of human cancers.
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Affiliation(s)
| | | | | | | | - Wenyi Wei
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Ave., Boston, MA 02215, USA.
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32
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Li JJ, Ferry RJ, Diao S, Xue B, Bahouth SW, Liao FF. Nedd4 haploinsufficient mice display moderate insulin resistance, enhanced lipolysis, and protection against high-fat diet-induced obesity. Endocrinology 2015; 156:1283-91. [PMID: 25607895 PMCID: PMC4399314 DOI: 10.1210/en.2014-1909] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Neural precursor cell expressed developmentally down-regulated protein 4 (Nedd4) is the prototypical protein in the Nedd4 ubiquitin ligase (E3) family, which governs ubiquitin-dependent endocytosis and/or degradation of plasma membrane proteins. Loss of Nedd4 results in embryonic or neonatal lethality in mice and reduced insulin/IGF-1 signaling in embryonic fibroblasts. To delineate the roles of Nedd4 in vivo, we examined the phenotypes of heterozygous knockout mice using a high-fat diet-induced obesity (HFDIO) model. We observed that Nedd4+/- mice are moderately insulin resistant but paradoxically protected against HFDIO. After high-fat diet feeding, Nedd4+/- mice showed less body weight gain, less fat mass, and smaller adipocytes vs the wild type. Despite ameliorated HFDIO, Nedd4+/- mice did not manifest improvement in glucose tolerance vs the wild type in both genders. Nedd4+/- male, but not female, mice displayed significantly lower fasting blood glucose levels and serum insulin levels. Under obesogenic conditions, Nedd4+/- mice displayed elevated stimulated lipolytic activity, primarily through a β2-adrenergic receptor. Combined, these data support novel complex roles for Nedd4 in metabolic regulation involving altered insulin and β-adrenergic signaling pathways.
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Affiliation(s)
- Jing Jing Li
- Departments of Pharmacology (J.J.L., S.D., S.W.B., F.-F.L.) and Pediatrics (R.J.F.), University of Tennessee Health Science Center, Memphis, Tennessee 38163; Department of Psychology (R.J.F), University of Memphis, Memphis, Tennessee 38152; and Department of Biology (B.X.), Georgia State University, Atlanta, Georgia 30302
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Li D, Xie P, Zhao F, Shu J, Li L, Zhan Y, Zhang L. F-box protein Fbxo3 targets Smurf1 ubiquitin ligase for ubiquitination and degradation. Biochem Biophys Res Commun 2015; 458:941-5. [PMID: 25721664 DOI: 10.1016/j.bbrc.2015.02.089] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 02/13/2015] [Indexed: 02/06/2023]
Abstract
It has been demonstrated previously that F-box protein Fbxl15 targets HECT-type E3 Smurf1 and forms a functionally active SCF complex for ubiquitination and proteasomal degradation. Here we show that another F-box protein Fbxo3, belonging to the FBXO type protein family, also interacts with and targets Smurf1 for poly-ubiquitination and proteasomal degradation. Different from Fbxl15, Fbxo3 targets all the Nedd4 family members for their degradation, indicating that Fbxo3 plays an important role in controlling the stability of Nedd4. Taken together, we show that Smurf1 is an endogenous substrate of Fbxo3. Our study gains further insight into the novel role of Fbxo3 in BMP signaling.
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Affiliation(s)
- Dongnian Li
- Department of Gastroenterology, Beijing Tongren Hospital, Capital Medical University, No.1 Dongjiaominxiang, Dongcheng District, Beijing 100730, China
| | - Ping Xie
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, No. 27 Taiping Road, Beijing 100850, China
| | - Fei Zhao
- Department of Ultrasound, Peking University Shougang Hospital, No.9 Jinyuanzhuang Road, Shijingshan District, Beijing 100144, China
| | - Jingyi Shu
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, No. 27 Taiping Road, Beijing 100850, China
| | - Li Li
- Department of Gastroenterology, Beijing Tongren Hospital, Capital Medical University, No.1 Dongjiaominxiang, Dongcheng District, Beijing 100730, China
| | - Yutao Zhan
- Department of Gastroenterology, Beijing Tongren Hospital, Capital Medical University, No.1 Dongjiaominxiang, Dongcheng District, Beijing 100730, China.
| | - Lingqiang Zhang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, No. 27 Taiping Road, Beijing 100850, China.
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Liu J, Wan L, Liu P, Inuzuka H, Liu J, Wang Z, Wei W. SCF(β-TRCP)-mediated degradation of NEDD4 inhibits tumorigenesis through modulating the PTEN/Akt signaling pathway. Oncotarget 2015; 5:1026-37. [PMID: 24657926 PMCID: PMC4011580 DOI: 10.18632/oncotarget.1675] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The HECT domain-containing ubiquitin E3 ligase NEDD4 is widely expressed in mammalian tissues and plays a crucial role in governing a wide spectrum of cellular processes including cell growth, tissue development and homeostasis. Recent reports have indicated that NEDD4 might facilitate tumorigenesis through targeted degradation of multiple tumor suppressor proteins including PTEN. However, the molecular mechanism by which NEDD4 stability is regulated has not been fully elucidated. Here we report that SCF(β-TRCP) governs NEDD4 protein stability by targeting it for ubiquitination and subsequent degradation in a Casein Kinase-I (CKI) phosphorylation-dependent manner. Specifically, depletion of β-TRCP, or inactivation of CKI, stabilized NEDD4, leading to down-regulation of its ubiquitin target PTEN and subsequent activation of the mTOR/Akt oncogenic pathway. Furthermore, we found that CKIδ-mediated phosphorylation of Ser347 and Ser348 on NEDD4 promoted its interaction with SCF(β-TRCP) for subsequent ubiquitination and degradation. As a result, compared to ectopic expression of wild-type NEDD4, introducing a non-degradable NEDD4 (S347A/S348A-NEDD4) promoted cancer cell growth and migration. Hence, our findings revealed the CKI/SCF(β-TRCP) signaling axis as the upstream negative regulator of NEDD4, and further suggested that enhancing NEDD4 degradation, presumably with CKI or SCF(β-TRCP) agonists, could be a promising strategy for treating human cancers.
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Affiliation(s)
- Jia Liu
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology and Frontier Institute of Life Science, FIST, Xi'an Jiaotong University, Xi'an, China
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Murtaza M, Jolly LA, Gecz J, Wood SA. La FAM fatale: USP9X in development and disease. Cell Mol Life Sci 2015; 72:2075-89. [PMID: 25672900 PMCID: PMC4427618 DOI: 10.1007/s00018-015-1851-0] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Revised: 02/02/2015] [Accepted: 02/04/2015] [Indexed: 11/12/2022]
Abstract
Deubiquitylating enzymes (DUBs), act downstream of ubiquitylation. As such, these post-post-translational modifiers function as the final arbitrators of a protein substrate’s ubiquitylation status, thus regulating its fate. In most instances, DUBs moderate the absolute level of a substrate, its locality or activity, rather than being an “all-or-none” phenomenon. Yet, disruption of this quantitative regulation can produce dramatic qualitative differences. The ubiquitin-specific protease 9X (USP9X/FAM) is a substrate-specific DUB, which displays an extraordinarily high level of sequence conservation from Drosophila to mammals. It is primarily the recent revelations of USP9X’s pivotal role in human cancers, both as oncogene or tumour suppressor, in developmental disorders including intellectual disability, epilepsy, autism and developmental delay that has led to a subsequent re-examination of its molecular and cellular functions. Results from experimental animal models have implicated USP9X in neurodegeneration, including Parkinson’s and Alzheimer’s disease, as well as autoimmune diseases. In this review, we describe the current and accumulated knowledge on the molecular, cellular and developmental aspects of USP9X function within the context of the biological consequences during normal development and disease.
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Affiliation(s)
- Mariyam Murtaza
- The Eskitis Institute for Drug Discovery, Griffith University, Brisbane, QLD, Australia
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36
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Multifaceted role of the ubiquitin ligase Itch in immune regulation. Immunol Cell Biol 2015; 93:452-60. [DOI: 10.1038/icb.2014.118] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 12/10/2014] [Accepted: 12/10/2014] [Indexed: 12/17/2022]
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37
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Boase NA, Kumar S. NEDD4: The founding member of a family of ubiquitin-protein ligases. Gene 2014; 557:113-22. [PMID: 25527121 DOI: 10.1016/j.gene.2014.12.020] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 12/01/2014] [Accepted: 12/10/2014] [Indexed: 01/31/2023]
Abstract
Ubiquitination plays a crucial role in regulating proteins post-translationally. The focus of this review is on NEDD4, the founding member of the NEDD4 family of ubiquitin ligases that is evolutionarily conserved in eukaryotes. Many potential substrates of NEDD4 have been identified and NEDD4 has been shown to play a critical role in the regulation of a number of membrane receptors, endocytic machinery components and the tumour suppressor PTEN. In this review we will discuss the diverse pathways in which NEDD4 is involved, and the patho-physiological significance of this important ubiquitin ligase.
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Affiliation(s)
- Natasha Anne Boase
- Centre for Cancer Biology, University of South Australia, Adelaide, SA 5001, Australia
| | - Sharad Kumar
- Centre for Cancer Biology, University of South Australia, Adelaide, SA 5001, Australia.
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Nedd4-1 is an exceptional prognostic biomarker for gastric cardia adenocarcinoma and functionally associated with metastasis. Mol Cancer 2014; 13:248. [PMID: 25395181 PMCID: PMC4239324 DOI: 10.1186/1476-4598-13-248] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 10/29/2014] [Indexed: 12/12/2022] Open
Abstract
Background Gastric cardia adenocarcinoma (GCA) is the most aggressive subtype of gastric carcinoma. New molecular markers and therapeutic targets are needed for diagnosis, prognosis and treatment of GCA. This study is to establish the E3 ubiquitin ligase Nedd4-1 as a prognostic biomarker to predict the survival and guide the treatment of GCA patients. Methods Expression of Nedd4-1 in 214 GCA tumor samples was detected by immunohistochemistry staining (IHC) using tissue microarray assay (TMA). Association of Nedd4-1 with cumulative survival of the TNM stages I-III patients and clinicopathological characteristics was statistically analyzed. The role of Nedd4-1 in gastric cancer cell migration and invasion were determined by transwell and wound healing assays. Results Nedd4-1 is overexpressed in 83% of the GCA tumors. The 5-year survival rate in Nedd4-1 negative GCA patients is as high as 96%. Log-rank analysis indicated that overexpression of Nedd4-1 is inversely correlated with cumulative survival (χ2 = 21.885, p <0.001). Multivariate logistic regression analysis showed that overexpression of Nedd4-1 is associated with an extremely low GCA survival rate with a hazard ratio (HR) = 0.068 (p = 0.008) in TNM stages I-III patients. Statistical analysis of association of Nedd4-1 overexpression with clinicopathological characteristics revealed that overexpression of Nedd4-1 is tightly associated with TNM stage (p < 0.001). Knockdown of Nedd4-1 in gastric cancer cell lines AGS and N87 dramatically inhibited the gastric cancer cell migration and invasion. Conclusions Our results indicate that Nedd4-1 is an exceptional prognostic biomarker for GCA and suggest that Nedd4-1 may play an essential role in GCA metastasis. Electronic supplementary material The online version of this article (doi:10.1186/1476-4598-13-248) contains supplementary material, which is available to authorized users.
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Mottet K, Bareiss B, Milne CD, Barry M. The poxvirus encoded ubiquitin ligase, p28, is regulated by proteasomal degradation and autoubiquitination. Virology 2014; 468-470:363-378. [PMID: 25240226 DOI: 10.1016/j.virol.2014.08.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 08/19/2014] [Accepted: 08/23/2014] [Indexed: 11/30/2022]
Abstract
Virus manipulation of the ubiquitin-proteasome system has become increasingly apparent. Ubiquitin is a 76 amino acid protein that is post-translationally conjugated to target proteins, while poly-ubiquitination subsequently leads to degradation via the 26S proteasome. Target specificity is determined by a large family of ubiquitin ligases. Poxviruses encode p28, a highly conserved ubiquitin ligase expressed in a wide range of poxviruses (J. Virol. 79:597). Here we investigate the relationship between p28 and ubiquitination. Confocal microscopy indicated that orthologs of p28 co-localized with ubiquitin at the virus factory. Flow cytometry assays further demonstrated that p28 was regulated by proteasomal degradation. Moreover, when the ubiquitin ligase activity of p28 was disrupted by mutating the RING domain conjugated ubiquitin still localized to the viral factories, indicating that an unknown ubiquitin ligase(s) was responsible for regulating p28. Our observations indicate that p28 is a ubiquitin ligase that is regulated by ubiquitination and proteasomal degradation.
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Affiliation(s)
- Kelly Mottet
- Li Ka Shing Institute of Virology, Department of Medical Microbiology and Immunology, 621 HMRC, University of Alberta, Edmonton, Alberta, Canada T6G 2S2
| | - Bettina Bareiss
- Li Ka Shing Institute of Virology, Department of Medical Microbiology and Immunology, 621 HMRC, University of Alberta, Edmonton, Alberta, Canada T6G 2S2
| | - Craig D Milne
- Li Ka Shing Institute of Virology, Department of Medical Microbiology and Immunology, 621 HMRC, University of Alberta, Edmonton, Alberta, Canada T6G 2S2
| | - Michele Barry
- Li Ka Shing Institute of Virology, Department of Medical Microbiology and Immunology, 621 HMRC, University of Alberta, Edmonton, Alberta, Canada T6G 2S2.
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Hsu TS, Hsiao HW, Wu PJ, Liu WH, Lai MZ. Deltex1 promotes protein kinase Cθ degradation and sustains Casitas B-lineage lymphoma expression. THE JOURNAL OF IMMUNOLOGY 2014; 193:1672-80. [PMID: 25000980 DOI: 10.4049/jimmunol.1301416] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The generation of T cell anergy is associated with upregulation of ubiquitin E3 ligases including Casitas B-lineage lymphoma (Cbl-b), Itch, gene related to anergy in lymphocyte, and deltex1 (DTX1). These E3 ligases attenuate T cell activation by targeting to signaling molecules. For example, Cbl-b and Itch promote the degradation of protein kinase Cθ (PKCθ) and phospholipase C-γ1 (PLC-γ1) in anergic Th1 cells. How these anergy-associated E3 ligases coordinate during T cell anergy remains largely unknown. In the current study, we found that PKCθ and PLC-γ1 are also downregulated by DTX1. DTX1 interacted with PKCθ and PLC-γ1 and stimulated the degradation of PKCθ and PLC-γ1. T cell anergy-induced proteolysis of PKCθ was prevented in Dtx1(-/-) T cells, supporting the essential role of DTX1 in PKCθ downregulation. Similar to Cbl-b and Itch, DTX1 promoted monoubiquitination of PKCθ. Proteasome inhibitor did not inhibit DTX1-directed PKCθ degradation, but instead DTX1 directed the relocalization of PKCθ into the lysosomal pathway. In addition, DTX1 interacted with Cbl-b and increased the protein levels of Cbl-b. We further demonstrated the possibility that, through the downregulation of PKCθ, DTX1 prevented PKCθ-induced Cbl-b degradation and increased Cbl-b protein stability. Our results suggest the coordination between E3 ligases during T cell anergy; DTX1 acts with Cbl-b to assure a more extensive silencing of PKCθ, whereas DTX1-mediated PKCθ degradation further stabilizes Cbl-b.
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Affiliation(s)
- Tzu-Sheng Hsu
- Institute of Immunology, National Taiwan University College of Medicine, Taipei 10051, Taiwan, Republic of China; Institute of Molecular Biology, Academia Sinica, Taipei 11529, Taiwan, Republic of China; and
| | - Huey-Wen Hsiao
- Institute of Molecular Biology, Academia Sinica, Taipei 11529, Taiwan, Republic of China; and
| | - Pei-Jung Wu
- Institute of Molecular Biology, Academia Sinica, Taipei 11529, Taiwan, Republic of China; and Institute of Life Sciences, National Defense Medical College, Taipei, Taiwan 114, Republic of China
| | - Wen-Hsien Liu
- Institute of Molecular Biology, Academia Sinica, Taipei 11529, Taiwan, Republic of China; and
| | - Ming-Zong Lai
- Institute of Immunology, National Taiwan University College of Medicine, Taipei 10051, Taiwan, Republic of China; Institute of Molecular Biology, Academia Sinica, Taipei 11529, Taiwan, Republic of China; and Institute of Life Sciences, National Defense Medical College, Taipei, Taiwan 114, Republic of China
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Tanksley JP, Chen X, Coffey RJ. NEDD4L is downregulated in colorectal cancer and inhibits canonical WNT signaling. PLoS One 2013; 8:e81514. [PMID: 24312311 PMCID: PMC3842946 DOI: 10.1371/journal.pone.0081514] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 10/23/2013] [Indexed: 12/14/2022] Open
Abstract
The NEDD4 family of E3 ubiquitin ligases includes nine members. Each is a modular protein, containing an N-terminal C2 domain for cell localization, two-to-four central WW domains for substrate recognition, and a C-terminal, catalytic HECT domain, which is responsible for catalyzing the ubiquitylation reaction. Members of this family are known to affect pathways central to the pathogenesis of colorectal cancer, including the WNT, TGFβ, EGFR, and p53 pathways. Recently, NEDD4 mRNA was reported to be overexpressed in colorectal cancer, but tumor stage was not considered in the analysis. Expression of the other family members has not been studied in colorectal cancer. Herein, we determined the expression patterns of all nine NEDD4 family members in 256 patients who presented with disease ranging from premalignant adenoma to stage IV colorectal cancer. NEDD4 mRNA was significantly increased in all stages of colorectal cancer. In contrast, NEDD4L mRNA, the closest homolog to NEDD4, was the most highly downregulated family member, and was significantly downregulated in all tumor stages. We also found NEDD4L protein was significantly decreased by western blotting in colorectal cancer samples compared to adjacent normal mucosa. In addition, NEDD4L, but not catalytically inactive NEDD4L, inhibited canonical WNT signaling at or below the level of β-catenin in vitro. These findings suggest that NEDD4L may play a tumor suppressive role in colorectal cancer, possibly through inhibition of canonical WNT signaling.
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Affiliation(s)
- Jarred P. Tanksley
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Xi Chen
- Department of Biostatistics, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Robert J. Coffey
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee, United States of America
- Department of Medicine, Vanderbilt University, Nashville, Tennessee, United States of America
- Department of Veterans Affairs Medical Center, Nashville, Tennessee, United States of America
- * E-mail:
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Threshold-controlled ubiquitination of the EGFR directs receptor fate. EMBO J 2013; 32:2140-57. [PMID: 23799367 PMCID: PMC3730230 DOI: 10.1038/emboj.2013.149] [Citation(s) in RCA: 139] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Accepted: 06/03/2013] [Indexed: 11/30/2022] Open
Abstract
How the cell converts graded signals into threshold-activated responses is a question of great biological relevance. Here, we uncover a nonlinear modality of epidermal growth factor receptor (EGFR)-activated signal transduction, by demonstrating that the ubiquitination of the EGFR at the PM is threshold controlled. The ubiquitination threshold is mechanistically determined by the cooperative recruitment of the E3 ligase Cbl, in complex with Grb2, to the EGFR. This, in turn, is dependent on the simultaneous presence of two phosphotyrosines, pY1045 and either one of pY1068 or pY1086, on the same EGFR moiety. The dose–response curve of EGFR ubiquitination correlate precisely with the non-clathrin endocytosis (NCE) mode of EGFR internalization. Finally, EGFR-NCE mechanistically depends on EGFR ubiquitination, as the two events can be simultaneously re-engineered on a phosphorylation/ubiquitination-incompetent EGFR backbone. Since NCE controls the degradation of the EGFR, our findings have implications for how the cell responds to increasing levels of EGFR signalling, by varying the balance of receptor signalling and degradation/attenuation. The amount of EGF present for binding to its receptor governs an on–off switch of EGFR ubiquitination and hence ligand-controlled non-clathrin-mediated endocytosis and EGFR degradation.
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Gautam V, Trinidad JC, Rimerman RA, Costa BM, Burlingame AL, Monaghan DT. Nedd4 is a specific E3 ubiquitin ligase for the NMDA receptor subunit GluN2D. Neuropharmacology 2013; 74:96-107. [PMID: 23639431 DOI: 10.1016/j.neuropharm.2013.04.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 04/16/2013] [Accepted: 04/17/2013] [Indexed: 01/14/2023]
Abstract
NMDA receptors are a family of glutamate-gated ion channels that regulate various CNS functions such as synaptic plasticity and learning. However hypo- or hyper-activation of NMDA receptors is critically involved in many neurological and psychiatric conditions such as pain, stroke, epilepsy, neurodegeneration, schizophrenia, and depression. Thus, it is important to identify mechanisms (such as by targeted ubiquitination) that regulate the levels of individual subtypes of NMDA receptors. In this study, we used a series of tagged, carboxy terminal constructs of GluN2D to identify associating proteins from rat brain. Of seven different GluN2D C-terminal fragments used as bait, only the construct containing amino acids 983-1097 associated with an E3 ubiquitin ligase, Nedd4. A direct interaction between GluN2D and Nedd4 was confirmed both in vivo and in vitro. This association is mediated by an interaction between GluN2D's C-terminal PPXY motif and the 2nd and 3rd WW domains of Nedd4. Of the four GluN2 subunits, Nedd4 directly interacted with GluN2D and also weakly with GluN2A. Nedd4 coexpression with GluN2D enhances GluN2D ubiquitination and reduces GluN1/GluN2D NMDA receptor responses. These results identify Nedd4 as a novel binding partner for GluN2D and suggest a mechanism for the regulation of NMDA receptors that contain GluN2D subunits through ubiquitination-dependent downregulation. This article is part of the Special Issue entitled 'Glutamate Receptor-Dependent Synaptic Plasticity'.
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Affiliation(s)
- Vivek Gautam
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, 985800 Nebraska Medical Center, Omaha, NE 68198-5800, USA.
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Guo H, Qiao G, Ying H, Li Z, Zhao Y, Liang Y, Yang L, Lipkowitz S, Penninger JM, Langdon WY, Zhang J. E3 ubiquitin ligase Cbl-b regulates Pten via Nedd4 in T cells independently of its ubiquitin ligase activity. Cell Rep 2013; 1:472-82. [PMID: 22763434 DOI: 10.1016/j.celrep.2012.04.008] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
E3 ubiquitin ligase Cbl-b plays a crucial role in T cell activation and tolerance induction. However, the molecular mechanism by which Cbl-b inhibits T cell activation remains unclear. Here, we report that Cbl-b does not inhibit PI3K but rather suppresses TCR/CD28-induced inactivation of Pten. The elevated Akt activity in Cbl-b(-/-) T cells is therefore due to heightened Pten inactivation. Suppression of Pten inactivation in T cells by Cbl-b is achieved by impeding the association of Pten with Nedd4, which targets Pten K13 for K63-linked polyubiquitination. Consistent with this finding, introducing Nedd4 deficiency into Cbl-b(-/-) mice abrogates hyper-T cell responses caused by the loss of Cbl-b. Hence, our data demonstrate that Cbl-b inhibits T cell activation by suppressing Pten inactivation independently of its ubiquitin ligase activity.
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Affiliation(s)
- Hui Guo
- Section of Nephrology, Department of Medicine, The University of Chicago, 5841 S. Maryland Avenue, Chicago, IL 60637, USA
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Dumaresq-Doiron K, Jules F, Lefrancois S. Sortilin turnover is mediated by ubiquitination. Biochem Biophys Res Commun 2013; 433:90-5. [PMID: 23485461 DOI: 10.1016/j.bbrc.2013.02.059] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 02/08/2013] [Indexed: 11/15/2022]
Abstract
Sortilin is a transmembrane domain protein that has been implicated in the sorting of prosaposin and other soluble cargo from the Golgi to the lysosomal compartment. While the majority of the receptor is recycled back to the Golgi from endosomes, it is known that upon successive rounds of transport, a proportion of sortilin is degraded in lysosomes. Recently, it was shown that sortilin is palmitoylated and that this post-translational modification prevents its degradation and enables sortilin to efficiently traffic back to the Golgi. Thus palmitoylation can be used to modulate the amount of receptor and hence cargo reaching the lysosome. In this work, we demonstrate that non-palmitoylated sortilin is ubiquitinated and internalized into the lysosomal compartment via the ESCRT pathway for degradation. Furthermore, we identified Nedd4 as an E3 ubiquitin ligase that mediates this post-translational modification. We propose a model where palmitoylation and ubiquitination play opposite roles in the stability and turnover of sortilin and serve as a control mechanism that balances the amount of lysosomal sorting and trafficking in cells.
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Affiliation(s)
- Karine Dumaresq-Doiron
- Centre de recherche de l'Hôpital Maisonneuve-Rosemont, Université de Montréal, Montréal, QC, Canada H1T 2M4
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Cbl and Itch binding sites in ERBB4 CYT-1 and CYT-2 mediate K48- and K63-polyubiquitination, respectively. Cell Signal 2013; 25:470-8. [DOI: 10.1016/j.cellsig.2012.11.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Accepted: 11/05/2012] [Indexed: 02/04/2023]
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Kang SA, Lee ST. PTK6 promotes degradation of c-Cbl through PTK6-mediated phosphorylation. Biochem Biophys Res Commun 2013; 431:734-9. [PMID: 23352614 DOI: 10.1016/j.bbrc.2013.01.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Accepted: 01/10/2013] [Indexed: 11/29/2022]
Abstract
PTK6 (also known as Brk) is an intracellular tyrosine kinase which induces proliferation, anti-apoptosis, migration, and anchorage-independent growth. Herein we report that PTK6 phosphorylates and down-regulates E3 ubiquitin ligase c-Cbl. Tyr(700), Tyr(731), and Tyr(774) residues in the C-terminal domain of c-Cbl are major phosphorylation sites targeted by PTK6. The phosphorylated c-Cbl is subjected to auto-ubiquitination and degraded through the ubiquitin-proteasome pathway. These results provide evidence for a novel mechanism demonstrating the oncogenic potential of PTK6 through degradation of c-Cbl, which is an E3 ligase important in down-regulation of oncoproteins.
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Affiliation(s)
- Shin-Ae Kang
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749, Republic of Korea
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Metzger MB, Hristova VA, Weissman AM. HECT and RING finger families of E3 ubiquitin ligases at a glance. J Cell Sci 2012; 125:531-7. [PMID: 22389392 DOI: 10.1242/jcs.091777] [Citation(s) in RCA: 439] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Affiliation(s)
- Meredith B Metzger
- Laboratory of Protein Dynamics and Signaling, Center for Cancer Research, National Cancer Institute-Frederick, 1050 Boyles Street, Frederick, MD 21702, USA
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Voutsadakis IA. The ubiquitin-proteasome system and signal transduction pathways regulating Epithelial Mesenchymal transition of cancer. J Biomed Sci 2012; 19:67. [PMID: 22827778 PMCID: PMC3418218 DOI: 10.1186/1423-0127-19-67] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Accepted: 07/09/2012] [Indexed: 02/08/2023] Open
Abstract
Epithelial to Mesenchymal transition (EMT) in cancer, a process permitting cancer cells to become mobile and metastatic, has a signaling hardwire forged from development. Multiple signaling pathways that regulate carcinogenesis enabling characteristics in neoplastic cells such as proliferation, resistance to apoptosis and angiogenesis are also the main players in EMT. These pathways, as almost all cellular processes, are in their turn regulated by ubiquitination and the Ubiquitin-Proteasome System (UPS). Ubiquitination is the covalent link of target proteins with the small protein ubiquitin and serves as a signal to target protein degradation by the proteasome or to other outcomes such as endocytosis, degradation by the lysosome or specification of cellular localization. This paper reviews signal transduction pathways regulating EMT and being regulated by ubiquitination.
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Affiliation(s)
- Ioannis A Voutsadakis
- Centre Pluridisciplinaire d'Oncologie, BH06, Centre Hospitalier Universitaire Vaudois, Bugnon 46, Lausanne, 1011, Switzerland.
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El-Meanawy A, Schelling JR, Iyengar SK, Hayden P, Barathan S, Goddard K, Pozuelo F, Elashi E, Nair V, Kretzler M, Sedor JR. Identification of nephropathy candidate genes by comparing sclerosis-prone and sclerosis-resistant mouse strain kidney transcriptomes. BMC Nephrol 2012; 13:61. [PMID: 22813067 PMCID: PMC3502501 DOI: 10.1186/1471-2369-13-61] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Accepted: 06/27/2012] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND The genetic architecture responsible for chronic kidney disease (CKD) remains incompletely described. The Oligosyndactyly (Os) mouse models focal and segmental glomerulosclerosis (FSGS), which is associated with reduced nephron number caused by the Os mutation. The Os mutation leads to FSGS in multiple strains including the ROP-Os/+. However, on the C57Bl/6J background the mutation does not cause FSGS, although nephron number in these mice are equivalent to those in ROP-Os/+ mice. We exploited this phenotypic variation to identify genes that potentially contribute to glomerulosclerosis. METHODS To identify such novel genes, which regulate susceptibility or resistance to renal disease progression, we generated and compared the renal transcriptomes using serial analysis of gene expression (SAGE) from the sclerosis-prone ROP-Os/+ and sclerosis resistant C57-Os/+ mouse kidneys. We confirmed the validity of the differential gene expression using multiple approaches. We also used an Ingenuity Pathway Analysis engine to assemble differentially regulated molecular networks. Cell culture techniques were employed to confirm functional relevance of selected genes. RESULTS A comparative analysis of the kidney transcriptomes revealed multiple genes, with expression levels that were statistically different. These novel, candidate, renal disease susceptibility/resistance genes included neuropilin2 (Nrp2), glutathione-S-transferase theta (Gstt1) and itchy (Itch). Of 34 genes with the most robust statistical difference in expression levels between ROP-Os/+ and C57-Os/+ mice, 13 and 3 transcripts localized to glomerular and tubulointerstitial compartments, respectively, from micro-dissected human FSGS biopsies. Network analysis of all significantly differentially expressed genes identified 13 connectivity networks. The most highly scored network highlighted the roles for oxidative stress and mitochondrial dysfunction pathways. Functional analyses of these networks provided evidence for activation of transforming growth factor beta (TGFβ) signaling in ROP-Os/+ kidneys despite similar expression of the TGFβ ligand between the tested strains. CONCLUSIONS These data demonstrate the complex dysregulation of normal cellular functions in this animal model of FSGS and suggest that therapies directed at multiple levels will be needed to effectively treat human kidney diseases.
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Affiliation(s)
- Ashraf El-Meanawy
- Kidney Disease Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Jeffery R Schelling
- Department of Medicine, MetroHealth System, Case Western Reserve University, Cleveland, OH, USA
| | - Sudha K Iyengar
- Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, OH, USA
| | - Patrick Hayden
- Department of Medicine, MetroHealth System, Case Western Reserve University, Cleveland, OH, USA
| | - Shrinath Barathan
- Department of Medicine, MetroHealth System, Case Western Reserve University, Cleveland, OH, USA
| | - Katrina Goddard
- Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, OH, USA
| | - Fatima Pozuelo
- Department of Medicine, MetroHealth System, Case Western Reserve University, Cleveland, OH, USA
| | - Essam Elashi
- Department of Medicine, MetroHealth System, Case Western Reserve University, Cleveland, OH, USA
| | - Viji Nair
- Department of Medicine, University of Michigan, Ann Arbor, MI, USA
| | | | - John R Sedor
- Department of Medicine, MetroHealth System, Case Western Reserve University, Cleveland, OH, USA
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