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Lee BWL, Chuah YH, Yoon J, Grinchuk OV, Liang Y, Hirpara JL, Shen Y, Wang LC, Lim YT, Zhao T, Sobota RM, Yeo TT, Wong ALA, Teo K, Nga VDW, Tan BWQ, Suda T, Toh TB, Pervaiz S, Lin Z, Ong DST. METTL8 links mt-tRNA m 3C modification to the HIF1α/RTK/Akt axis to sustain GBM stemness and tumorigenicity. Cell Death Dis 2024; 15:338. [PMID: 38744809 PMCID: PMC11093979 DOI: 10.1038/s41419-024-06718-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 05/02/2024] [Accepted: 05/02/2024] [Indexed: 05/16/2024]
Abstract
Epitranscriptomic RNA modifications are crucial for the maintenance of glioma stem cells (GSCs), the most malignant cells in glioblastoma (GBM). 3-methylcytosine (m3C) is a new epitranscriptomic mark on RNAs and METTL8 represents an m3C writer that is dysregulated in cancer. Although METTL8 has an established function in mitochondrial tRNA (mt-tRNA) m3C modification, alternative splicing of METTL8 can also generate isoforms that localize to the nucleolus where they may regulate R-loop formation. The molecular basis for METTL8 dysregulation in GBM, and which METTL8 isoform(s) may influence GBM cell fate and malignancy remain elusive. Here, we investigated the role of METTL8 in regulating GBM stemness and tumorigenicity. In GSC, METTL8 is exclusively localized to the mitochondrial matrix where it installs m3C on mt-tRNAThr/Ser(UCN) for mitochondrial translation and respiration. High expression of METTL8 in GBM is attributed to histone variant H2AZ-mediated chromatin accessibility of HIF1α and portends inferior glioma patient outcome. METTL8 depletion impairs the ability of GSC to self-renew and differentiate, thus retarding tumor growth in an intracranial GBM xenograft model. Interestingly, METTL8 depletion decreases protein levels of HIF1α, which serves as a transcription factor for several receptor tyrosine kinase (RTK) genes, in GSC. Accordingly, METTL8 loss inactivates the RTK/Akt axis leading to heightened sensitivity to Akt inhibitor treatment. These mechanistic findings, along with the intimate link between METTL8 levels and the HIF1α/RTK/Akt axis in glioma patients, guided us to propose a HIF1α/Akt inhibitor combination which potently compromises GSC proliferation/self-renewal in vitro. Thus, METTL8 represents a new GBM dependency that is therapeutically targetable.
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Affiliation(s)
- Bernice Woon Li Lee
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - You Heng Chuah
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Jeehyun Yoon
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Oleg V Grinchuk
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Yajing Liang
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
| | - Jayshree L Hirpara
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, 117599, Singapore
| | - Yating Shen
- The N.1 Institute for Health, National University of Singapore, Singapore, Singapore
- The Institute for Digital Medicine (WisDM), Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Loo Chien Wang
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Tianyun Zhao
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Radoslaw M Sobota
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Tseng Tsai Yeo
- Department of Surgery, Division of Neurosurgery, National University Hospital, Singapore, Singapore
| | - Andrea Li Ann Wong
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, 117599, Singapore
- Department of Haematology-Oncology, National University Hospital, Singapore, Singapore
| | - Kejia Teo
- Department of Surgery, Division of Neurosurgery, National University Hospital, Singapore, Singapore
| | - Vincent Diong Weng Nga
- Department of Surgery, Division of Neurosurgery, National University Hospital, Singapore, Singapore
| | - Bryce Wei Quan Tan
- Department of Medicine, National University Hospital, Singapore, Singapore
| | - Toshio Suda
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, 117599, Singapore
- International Research Center for Medical Sciences, Kumamoto University, Kumamoto, 860-0811, Japan
| | - Tan Boon Toh
- The N.1 Institute for Health, National University of Singapore, Singapore, Singapore
- The Institute for Digital Medicine (WisDM), Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Shazib Pervaiz
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Zhewang Lin
- Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, 117543, Singapore, Singapore
| | - Derrick Sek Tong Ong
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore.
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.
- National Neuroscience Institute, 308433, Singapore, Singapore.
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2
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Lim YT, Williams TC, Langley RJ, Weir E. Mepolizumab in children and adolescents with severe eosinophilic asthma not eligible for omalizumab: a single Center experience. J Asthma 2024:1-8. [PMID: 38240489 DOI: 10.1080/02770903.2024.2303767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 01/07/2024] [Indexed: 01/25/2024]
Abstract
BACKGROUND Mepolizumab is an anti-interleukin-5 monoclonal antibody shown to reduce asthma exacerbations in adults and adolescents with severe eosinophilic asthma. AIM To assess the impact of mepolizumab on children and adolescents over 12 months by examining steroid usage, asthma-related hospitalizations, Asthma Control Test (ACT) scores, fractional exhaled nitric oxide concentration (FeNO), forced expiratory volume in 1 s (FEV1), mid expiratory flow (FEF25-75%), and blood eosinophil count. METHODS Retrospective analysis performed between October 2015 and December 2022. Data was reviewed 12 months before and after commencing mepolizumab. Mepolizumab was offered if the patient had severe eosinophilic asthma and were unresponsive to or ineligible for omalizumab. RESULTS Sixteen participants (age 7-17, 8 males, 8 females) received subcutaneous mepolizumab monthly with no serious adverse reactions. Incidence of hospital admissions fell significantly (IRR 0.33, p = 0.007). Among the 11 patients receiving daily oral corticosteroids, 3 were weaned off daily oral steroids and 3 patients' daily dose was significantly reduced (mean Δ-0.095 ± 0.071 mg/kg, p = 0.0012). Eosinophil count was decreased (mean Δ-0.85 x 109/L, p < 0.001). There was no significant change in mean overall steroid burden per patient (mean Δ-1445.63 ± 1603.18 mg, p = 0.10), ACT scores (mean Δ2.88 ± 6.71, p = 0.17), FEV1 z-scores (mean Δ-0.99 ± 1.88, p = 0.053), FEF25-75% z-scores (mean Δ-0.65 ± 1.61, p = 0.13), FeNO (mean Δ-20.09 ± 80.86, p = 0.34), or number of courses of oral steroids given for asthma attacks (IRR 0.71, p = 0.09). CONCLUSION Among children and adolescents with severe eosinophilic asthma ineligible for or not responsive to omalizumab, mepolizumab therapy exhibited significant reduction in rate of asthma-related hospitalizations and significant decrease in daily steroid dosage.
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Affiliation(s)
- Y T Lim
- Department of Paediatric Respiratory, Royal Hospital for Children, Glasgow, UK
| | - T C Williams
- Department of Paediatric Respiratory, Royal Hospital for Children, Glasgow, UK
| | - R J Langley
- Department of Paediatric Respiratory, Royal Hospital for Children, Glasgow, UK
| | - E Weir
- Department of Paediatric Respiratory, Royal Hospital for Children, Glasgow, UK
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3
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Ser Z, Gu Y, Yap J, Lim YT, Wang SM, Hamidinia M, Murali TM, Kumar R, Gascoigne NR, MacAry PA, Sobota RM. Hybrid structural modeling of alloantibody binding to human leukocyte antigen with rapid and reproducible cross-linking mass spectrometry. Cell Rep Methods 2023; 3:100569. [PMID: 37751693 PMCID: PMC10545907 DOI: 10.1016/j.crmeth.2023.100569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 06/05/2023] [Accepted: 08/07/2023] [Indexed: 09/28/2023]
Abstract
Alloantibody recognition of donor human leukocyte antigen (HLA) is associated with poor clinical transplantation outcomes. However, the molecular and structural basis for the alloantibody-HLA interaction is not well understood. Here, we used a hybrid structural modeling approach on a previously studied alloantibody-HLA interacting pair with inputs from ab initio, in silico, and in vitro data. Highly reproducible cross-linking mass spectrometry data were obtained with both discovery- and targeted mass spectrometry-based approaches approaches. The cross-link information was then used together with predicted antibody Fv structure, predicted antibody paratope, and in silico-predicted interacting surface to model the antibody-HLA interaction. This hybrid structural modeling approach closely recapitulates the key interacting residues from a previously solved crystal structure of an alloantibody-HLA-A∗11:01 pair. These results suggest that a predictive-based hybrid structural modeling approach supplemented with cross-linking mass spectrometry data can provide functionally relevant structural models to understand the structural basis of antibody-HLA mismatch in transplantation.
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Affiliation(s)
- Zheng Ser
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore 138673, Singapore
| | - Yue Gu
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore; Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore
| | - Jiawei Yap
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore; Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore 138673, Singapore
| | - Shi Mei Wang
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore 138673, Singapore
| | - Maryam Hamidinia
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore; Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore
| | - Tanusya Murali Murali
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore; Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore
| | - Ragini Kumar
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore 138673, Singapore
| | - Nicholas Rj Gascoigne
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore; Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore
| | - Paul A MacAry
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore; Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore
| | - Radoslaw M Sobota
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore 138673, Singapore.
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4
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Rialdi A, Duffy M, Scopton AP, Fonseca F, Zhao JN, Schwarz M, Molina-Sanchez P, Mzoughi S, Arceci E, Abril-Fornaguera J, Meadows A, Ruiz de Galarreta M, Torre D, Reyes K, Lim YT, Rosemann F, Khan ZM, Mohammed K, Wang X, Yu X, Lakshmanan M, Rajarethinam R, Tan SY, Jin J, Villanueva A, Michailidis E, De Jong YP, Rice CM, Marazzi I, Hasson D, Llovet JM, Sobota RM, Lujambio A, Guccione E, Dar AC. WNTinib is a multi-kinase inhibitor with specificity against β-catenin mutant hepatocellular carcinoma. Nat Cancer 2023; 4:1157-1175. [PMID: 37537299 PMCID: PMC10948969 DOI: 10.1038/s43018-023-00609-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 07/05/2023] [Indexed: 08/05/2023]
Abstract
Hepatocellular carcinoma (HCC) is a leading cause of cancer-related deaths worldwide. β-Catenin (CTNNB1)-mutated HCC represents 30% of cases of the disease with no precision therapeutics available. Using chemical libraries derived from clinical multi-kinase inhibitor (KI) scaffolds, we screened HCC organoids to identify WNTinib, a KI with exquisite selectivity in CTNNB1-mutated human and murine models, including patient samples. Multiomic and target engagement analyses, combined with rescue experiments and in vitro and in vivo efficacy studies, revealed that WNTinib is superior to clinical KIs and inhibits KIT/mitogen-activated protein kinase (MAPK) signaling at multiple nodes. Moreover, we demonstrate that reduced engagement on BRAF and p38α kinases by WNTinib relative to several multi-KIs is necessary to avoid compensatory feedback signaling-providing a durable and selective transcriptional repression of mutant β-catenin/Wnt targets through nuclear translocation of the EZH2 transcriptional repressor. Our studies uncover a previously unknown mechanism to harness the KIT/MAPK/EZH2 pathway to potently and selectively antagonize CTNNB1-mutant HCC with an unprecedented wide therapeutic index.
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Affiliation(s)
- Alex Rialdi
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Mary Duffy
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Alex P Scopton
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Frank Fonseca
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Julia Nanyi Zhao
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Megan Schwarz
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Pedro Molina-Sanchez
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Slim Mzoughi
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Elisa Arceci
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Jordi Abril-Fornaguera
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Translational Research in Hepatic Oncology, Liver Unit, IDIBAPS, Hospital Clinic, University of Barcelona, Barcelona, Spain
| | - Austin Meadows
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Marina Ruiz de Galarreta
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Denis Torre
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kyna Reyes
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Yan Ting Lim
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore
| | - Felix Rosemann
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Zaigham M Khan
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kevin Mohammed
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Xuedi Wang
- Bioinformatics for Next Generation Sequencing Shared Resource Facility, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Xufen Yu
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Manikandan Lakshmanan
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore
| | - Ravisankar Rajarethinam
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore
| | - Soo Yong Tan
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Jian Jin
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Augusto Villanueva
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Division of Hematology and Medical Oncology, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Eleftherios Michailidis
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY, USA
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, School of Medicine, Emory University, Atlanta, GA, USA
| | - Ype P De Jong
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY, USA
- Division of Gastroenterology and Hepatology, Weill Cornell Medicine, New York, NY, USA
| | - Charles M Rice
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY, USA
| | - Ivan Marazzi
- Department of Biological Cancer, University of California Irvine, Orange, CA, USA
| | - Dan Hasson
- Bioinformatics for Next Generation Sequencing Shared Resource Facility, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Josep M Llovet
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Translational Research in Hepatic Oncology, Liver Unit, IDIBAPS, Hospital Clinic, University of Barcelona, Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
| | - Radoslaw M Sobota
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore
| | - Amaia Lujambio
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
| | - Ernesto Guccione
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Center for OncoGenomics and Innovative Therapeutics, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Bioinformatics for Next Generation Sequencing Shared Resource Facility, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
| | - Arvin C Dar
- Center for Therapeutics Discovery, Department of Oncological Sciences and Pharmacological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Program in Chemical Biology, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
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5
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Chuah YH, Tay EXY, Grinchuk OV, Yoon J, Feng J, Kannan S, Robert M, Jakhar R, Liang Y, Lee BWL, Wang LC, Lim YT, Zhao T, Sobota RM, Lu G, Low BC, Crasta KC, Verma CS, Lin Z, Ong DST. CAMK2D serves as a molecular scaffold for RNF8-MAD2 complex to induce mitotic checkpoint in glioma. Cell Death Differ 2023; 30:1973-1987. [PMID: 37468549 PMCID: PMC10406836 DOI: 10.1038/s41418-023-01192-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 07/04/2023] [Accepted: 07/12/2023] [Indexed: 07/21/2023] Open
Abstract
MAD2 is a spindle assembly checkpoint protein that participates in the formation of mitotic checkpoint complex, which blocks mitotic progression. RNF8, an established DNA damage response protein, has been implicated in mitotic checkpoint regulation but its exact role remains poorly understood. Here, RNF8 proximity proteomics uncovered a role of RNF8-MAD2 in generating the mitotic checkpoint signal. Specifically, RNF8 competes with a small pool of p31comet for binding to the closed conformer of MAD2 via its RING domain, while CAMK2D serves as a molecular scaffold to concentrate the RNF8-MAD2 complex via transient/weak interactions between its p-Thr287 and RNF8's FHA domain. Accordingly, RNF8 overexpression impairs glioma stem cell (GSC) mitotic progression in a FHA- and RING-dependent manner. Importantly, low RNF8 expression correlates with inferior glioma outcome and RNF8 overexpression impedes GSC tumorigenicity. Last, we identify PLK1 inhibitor that mimics RNF8 overexpression using a chemical biology approach, and demonstrate a PLK1/HSP90 inhibitor combination that synergistically reduces GSC proliferation and stemness. Thus, our study has unveiled a previously unrecognized CAMK2D-RNF8-MAD2 complex in regulating mitotic checkpoint with relevance to gliomas, which is therapeutically targetable.
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Affiliation(s)
- You Heng Chuah
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Emmy Xue Yun Tay
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Oleg V Grinchuk
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Jeehyun Yoon
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Jia Feng
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
| | - Srinivasaraghavan Kannan
- Bioinformatics Institute, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - Matius Robert
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Rekha Jakhar
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Yajing Liang
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
| | - Bernice Woon Li Lee
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Loo Chien Wang
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Tianyun Zhao
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Radoslaw M Sobota
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Guang Lu
- Department of Physiology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Boon Chuan Low
- Mechanobiology Institute, 5A Engineering Drive 1, National University of Singapore, Singapore, 117411, Singapore
- Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, Singapore, 117543, Singapore
- University Scholars Programme, 18 College Avenue East, Singapore, 138593, Singapore
| | - Karen Carmelina Crasta
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Chandra Shekhar Verma
- Bioinformatics Institute, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
- Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, Singapore, 117543, Singapore
- School of Biological Sciences, Nanyang Technological University, Singapore, 637551, Singapore
| | - Zhewang Lin
- Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, Singapore, 117543, Singapore
| | - Derrick Sek Tong Ong
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Singapore.
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.
- National Neuroscience Institute, Singapore, 308433, Singapore.
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6
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Ahn M, Chen VCW, Rozario P, Ng WL, Kong PS, Sia WR, Kang AEZ, Su Q, Nguyen LH, Zhu F, Chan WOY, Tan CW, Cheong WS, Hey YY, Foo R, Guo F, Lim YT, Li X, Chia WN, Sobota RM, Fu NY, Irving AT, Wang LF. Bat ASC2 suppresses inflammasomes and ameliorates inflammatory diseases. Cell 2023; 186:2144-2159.e22. [PMID: 37172565 DOI: 10.1016/j.cell.2023.03.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/12/2022] [Accepted: 03/31/2023] [Indexed: 05/15/2023]
Abstract
Bats are special in their ability to live long and host many emerging viruses. Our previous studies showed that bats have altered inflammasomes, which are central players in aging and infection. However, the role of inflammasome signaling in combating inflammatory diseases remains poorly understood. Here, we report bat ASC2 as a potent negative regulator of inflammasomes. Bat ASC2 is highly expressed at both the mRNA and protein levels and is highly potent in inhibiting human and mouse inflammasomes. Transgenic expression of bat ASC2 in mice reduced the severity of peritonitis induced by gout crystals and ASC particles. Bat ASC2 also dampened inflammation induced by multiple viruses and reduced mortality of influenza A virus infection. Importantly, it also suppressed SARS-CoV-2-immune-complex-induced inflammasome activation. Four key residues were identified for the gain of function of bat ASC2. Our results demonstrate that bat ASC2 is an important negative regulator of inflammasomes with therapeutic potential in inflammatory diseases.
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Affiliation(s)
- Matae Ahn
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore; SingHealth Duke-NUS Medicine Academic Clinical Program, Singapore 168753, Singapore; SingHealth PGY1 Residency Program, Singapore 169608, Singapore; Department of Internal Medicine, Singapore General Hospital, Singapore 169608, Singapore.
| | - Vivian Chih-Wei Chen
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Pritisha Rozario
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Wei Lun Ng
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Pui San Kong
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Wan Rong Sia
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Adrian Eng Zheng Kang
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Qi Su
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Lan Huong Nguyen
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Feng Zhu
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Wharton O Y Chan
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Chee Wah Tan
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Wan Shoo Cheong
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Ying Ying Hey
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Randy Foo
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Fusheng Guo
- Programme in Cancer and Stem Cell Biology, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore; SingMass - National Mass Spectrometry Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore
| | - Xin Li
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore; SingMass - National Mass Spectrometry Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore
| | - Wan Ni Chia
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Radoslaw M Sobota
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore; SingMass - National Mass Spectrometry Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore
| | - Nai Yang Fu
- Programme in Cancer and Stem Cell Biology, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Aaron T Irving
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore; Zhejiang University-University of Edinburgh Institute, Zhejiang University School of Medicine, Zhejiang University, Haining 314400, China; Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Lin-Fa Wang
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore; SingHealth Duke-NUS Global Health Institute, Singapore 169857, Singapore.
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7
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Zhang J, Hu Z, Chung HH, Tian Y, Lau KW, Ser Z, Lim YT, Sobota RM, Leong HF, Chen BJ, Yeo CJ, Tan SYX, Kang J, Tan DEK, Sou IF, McClurg UL, Lakshmanan M, Vaiyapuri TS, Raju A, Wong ESM, Tergaonkar V, Rajarethinam R, Pathak E, Tam WL, Tan EY, Tee WW. Dependency of NELF-E-SLUG-KAT2B epigenetic axis in breast cancer carcinogenesis. Nat Commun 2023; 14:2439. [PMID: 37117180 PMCID: PMC10147683 DOI: 10.1038/s41467-023-38132-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 04/17/2023] [Indexed: 04/30/2023] Open
Abstract
Cancer cells undergo transcriptional reprogramming to drive tumor progression and metastasis. Using cancer cell lines and patient-derived tumor organoids, we demonstrate that loss of the negative elongation factor (NELF) complex inhibits breast cancer development through downregulating epithelial-mesenchymal transition (EMT) and stemness-associated genes. Quantitative multiplexed Rapid Immunoprecipitation Mass spectrometry of Endogenous proteins (qPLEX-RIME) further reveals a significant rewiring of NELF-E-associated chromatin partners as a function of EMT and a co-option of NELF-E with the key EMT transcription factor SLUG. Accordingly, loss of NELF-E leads to impaired SLUG binding on chromatin. Through integrative transcriptomic and genomic analyses, we identify the histone acetyltransferase, KAT2B, as a key functional target of NELF-E-SLUG. Genetic and pharmacological inactivation of KAT2B ameliorate the expression of EMT markers, phenocopying NELF ablation. Elevated expression of NELF-E and KAT2B is associated with poorer prognosis in breast cancer patients, highlighting the clinical relevance of our findings. Taken together, we uncover a crucial role of the NELF-E-SLUG-KAT2B epigenetic axis in breast cancer carcinogenesis.
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Affiliation(s)
- Jieqiong Zhang
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Republic of Singapore
| | - Zhenhua Hu
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Hwa Hwa Chung
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Yun Tian
- Department of Oncology, Jiangsu Province Hospital of Chinese Medicine, Affiliated Hospital of Nanjing University of Chinese Medicine, 210004, Nanjing, People's Republic of China
| | - Kah Weng Lau
- Department of Pathology, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Republic of Singapore
| | - Zheng Ser
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Radoslaw M Sobota
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Hwei Fen Leong
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Benjamin Jieming Chen
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Clarisse Jingyi Yeo
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Shawn Ying Xuan Tan
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Jian Kang
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Dennis Eng Kiat Tan
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Ieng Fong Sou
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
- Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, UK
| | - Urszula Lucja McClurg
- Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, UK
| | - Manikandan Lakshmanan
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Thamil Selvan Vaiyapuri
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Anandhkumar Raju
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Esther Sook Miin Wong
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Vinay Tergaonkar
- Department of Pathology, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Republic of Singapore
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
- NUS Centre for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, Singapore, 117599, Republic of Singapore
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, 8 Medical Drive, Singapore, 117597, Republic of Singapore
| | - Ravisankar Rajarethinam
- Advanced Molecular Pathology Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
| | - Elina Pathak
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), 60 Biopolis Drive, Genome, Singapore, 138672, Republic of Singapore
| | - Wai Leong Tam
- NUS Centre for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, Singapore, 117599, Republic of Singapore
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, 8 Medical Drive, Singapore, 117597, Republic of Singapore
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), 60 Biopolis Drive, Genome, Singapore, 138672, Republic of Singapore
- Cancer Science Institute of Singapore, National University of Singapore, 14 Medical Drive, Singapore, 117599, Republic of Singapore
| | - Ern Yu Tan
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore
- Department of General Surgery, Tan Tock Seng Hospital, Singapore, 308433, Republic of Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, 308232, Republic of Singapore
| | - Wee-Wei Tee
- Chromatin Dynamics and Disease Epigenetics Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673, Republic of Singapore.
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117593, Republic of Singapore.
- NUS Centre for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, Singapore, 117599, Republic of Singapore.
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8
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Ho TLF, Lee MY, Goh HC, Ng GYN, Lee JJH, Kannan S, Lim YT, Zhao T, Lim EKH, Phua CZJ, Lee YF, Lim RYX, Ng PJH, Yuan J, Chan DKH, Lieske B, Chong CS, Lee KC, Lum J, Cheong WK, Yeoh KG, Tan KK, Sobota RM, Verma CS, Lane DP, Tam WL, Venkitaraman AR. Domain-specific p53 mutants activate EGFR by distinct mechanisms exposing tissue-independent therapeutic vulnerabilities. Nat Commun 2023; 14:1726. [PMID: 36977662 PMCID: PMC10050071 DOI: 10.1038/s41467-023-37223-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/08/2023] [Indexed: 03/30/2023] Open
Abstract
Mis-sense mutations affecting TP53 promote carcinogenesis both by inactivating tumor suppression, and by conferring pro-carcinogenic activities. We report here that p53 DNA-binding domain (DBD) and transactivation domain (TAD) mis-sense mutants unexpectedly activate pro-carcinogenic epidermal growth factor receptor (EGFR) signaling via distinct, previously unrecognized molecular mechanisms. DBD- and TAD-specific TP53 mutants exhibited different cellular localization and induced distinct gene expression profiles. In multiple tissues, EGFR is stabilized by TAD and DBD mutants in the cytosolic and nuclear compartments respectively. TAD mutants promote EGFR-mediated signaling by enhancing EGFR interaction with AKT via DDX31 in the cytosol. Conversely, DBD mutants maintain EGFR activity in the nucleus, by blocking EGFR interaction with the phosphatase SHP1, triggering c-Myc and Cyclin D1 upregulation. Our findings suggest that p53 mutants carrying gain-of-function, mis-sense mutations affecting two different domains form new protein complexes that promote carcinogenesis by enhancing EGFR signaling via distinctive mechanisms, exposing clinically relevant therapeutic vulnerabilities.
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Affiliation(s)
- Teresa Lai Fong Ho
- Disease Intervention Technology Lab (DITL), Institute of Molecular and Cell Biology, Agency for Science Technology and Research (A*STAR), Singapore, Singapore
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - May Yin Lee
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Hui Chin Goh
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | | | - Jane Jia Hui Lee
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Srinivasaraghavan Kannan
- Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- SingMass - National Mass Spectrometry Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Tianyun Zhao
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- SingMass - National Mass Spectrometry Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Edwin Kok Hao Lim
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Cheryl Zi Jin Phua
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Yi Fei Lee
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Rebecca Yi Xuan Lim
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Perry Jun Hao Ng
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Ju Yuan
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Dedrick Kok Hong Chan
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
- Division of Colorectal Surgery, University Surgical Cluster, National University Health System, Singapore, Singapore
| | - Bettina Lieske
- Division of Colorectal Surgery, University Surgical Cluster, National University Health System, Singapore, Singapore
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Choon Seng Chong
- Division of Colorectal Surgery, University Surgical Cluster, National University Health System, Singapore, Singapore
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Kuok Chung Lee
- Division of Colorectal Surgery, University Surgical Cluster, National University Health System, Singapore, Singapore
| | - Jeffrey Lum
- Department of Pathology, National University Health System, Singapore, Singapore
| | - Wai Kit Cheong
- Division of Colorectal Surgery, University Surgical Cluster, National University Health System, Singapore, Singapore
| | - Khay Guan Yeoh
- University Surgical Cluster, National University Health System, Singapore, Singapore
| | - Ker Kan Tan
- Division of Colorectal Surgery, University Surgical Cluster, National University Health System, Singapore, Singapore
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Radoslaw M Sobota
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- SingMass - National Mass Spectrometry Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Chandra S Verma
- Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- School of Biological Science, Nanyang Technological University, Singapore, Singapore
- Department of Biological Science, National University of Singapore, Singapore, Singapore
| | - David P Lane
- Disease Intervention Technology Lab (DITL), Institute of Molecular and Cell Biology, Agency for Science Technology and Research (A*STAR), Singapore, Singapore
| | - Wai Leong Tam
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- School of Biological Science, Nanyang Technological University, Singapore, Singapore
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Ashok R Venkitaraman
- Disease Intervention Technology Lab (DITL), Institute of Molecular and Cell Biology, Agency for Science Technology and Research (A*STAR), Singapore, Singapore.
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore.
- NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
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9
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Lim YT, Robinson S, Tang MM. Liver Disease Among Patients with Psoriasis: The Malaysian Psoriasis Registry. Clin Exp Dermatol 2023; 48:476-483. [PMID: 36632801 DOI: 10.1093/ced/llad013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 01/05/2023] [Accepted: 01/11/2023] [Indexed: 01/13/2023]
Abstract
BACKGROUND Therapeutic options for psoriasis may be limited for patients with concomitant liver disease. OBJECTIVE We aim to report the frequency of liver disease among psoriasis patients, describe the clinical features, treatment modalities and quality of life. METHODS This was a multi-center cross-sectional study of psoriasis patients notified to the Malaysian Psoriasis Registry (MPR) from January 2007 to December 2018. RESULTS Of 21,735 psoriasis patients, 174 (0.8%) had liver disease. The three most common liver diseases were viral hepatitis (62.1%), fatty liver (14.4%) and liver cirrhosis (10.9%). The male-to-female ratio was 3.8:1. Mean age of onset of psoriasis was higher in those with liver disease compared to those without (37.25 ± 13.47 years vs 33.26 ± 16.96 years, p < 0.001). Psoriasis patients with liver disease had a higher rate of dyslipidemia (27.5%vs16.4%, p < 0.001), hypertension (33.9%vs23.7%, p = 0.002), diabetes mellitus (22.4%vs15.9%, p = 0.021) and HIV infection (5.3%vs0.4%, p < 0.001) compared to those without liver disease.They were also more likely to have severe disease (BSA > 10% and/or DLQI > 10) (59.3%vs49.9%, p = 0.027), psoriatic arthropathy (21.1%vs13.0%, p = 0.002), and nail involvement (78.2%vs56.1%, p < 0.001) compared to those without liver disease. The use of phototherapy (8.4%vs2.6%, p < 0.001), acitretin (7.3%vs2.8%, p < 0.001) and cyclosporin (3.0%vs0.7%, p < 0.001) were significantly higher in the group with liver disease. The mean Dermatology Life Quality Index were similar in both groups (9.69 ± 7.20vs9.62 ± 6.75, p = 0.88). CONCLUSIONS The frequency of psoriasis patients with liver disease in MPR was 0.8%. Psoriasis patients with liver disease were more likely to be male, had a higher rate of co-morbidities, severe disease, nail and joint involvement than those without liver disease.
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Affiliation(s)
- Y T Lim
- Department of Dermatology, Hospital Sultanah Aminah, Ministry of Health Malaysia, Johor Bahru, Malaysia
| | - S Robinson
- Department of Dermatology, Hospital Kuala Lumpur, Ministry of Health Malaysia, Kuala Lumpur, Malaysia
| | - M M Tang
- Department of Dermatology, Hospital Kuala Lumpur, Ministry of Health Malaysia, Kuala Lumpur, Malaysia
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10
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Gamage AM, Chan WOY, Zhu F, Lim YT, Long S, Ahn M, Tan CW, Hiang Foo RJ, Sia WR, Lim XF, He H, Zhai W, Anderson DE, Sobota RM, Dutertre CA, Wang LF. Single-cell transcriptome analysis of the in vivo response to viral infection in the cave nectar bat Eonycteris spelaea. Immunity 2022; 55:2187-2205.e5. [PMID: 36351376 DOI: 10.1016/j.immuni.2022.10.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 07/19/2022] [Accepted: 10/12/2022] [Indexed: 11/09/2022]
Abstract
Bats are reservoir hosts of many zoonotic viruses with pandemic potential. We utilized single-cell transcriptome sequencing (scRNA-seq) to analyze the immune response in bat lungs upon in vivo infection with a double-stranded RNA virus, Pteropine orthoreovirus PRV3M. Bat neutrophils were distinguished by high basal IDO1 expression. NK cells and T cells were the most abundant immune cells in lung tissue. Three distinct CD8+ effector T cell populations could be delineated by differential expression of KLRB1, GFRA2, and DPP4. Select NK and T clusters increased expression of genes involved in T cell activation and effector function early after viral infection. Alveolar macrophages and classical monocytes drove antiviral interferon signaling. Infection expanded a CSF1R+ population expressing collagen-like genes, which became the predominant myeloid cell type post-infection. This work uncovers features relevant to viral disease tolerance in bats, lays a foundation for future experimental work, and serves as a resource for comparative immunology studies.
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Affiliation(s)
- Akshamal M Gamage
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore
| | - Wharton O Y Chan
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore
| | - Feng Zhu
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore
| | - Sandy Long
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore
| | - Matae Ahn
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore
| | - Chee Wah Tan
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore
| | - Randy Jee Hiang Foo
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore
| | - Wan Rong Sia
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore
| | - Xiao Fang Lim
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore
| | - Haopeng He
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P.R. China
| | - Weiwei Zhai
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P.R. China; Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming 650223, P.R. China; Human Genetics, Genome Institute of Singapore, Agency for Science, Technology and Research, 138672, Singapore, Singapore
| | - Danielle E Anderson
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore; Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne 3000, Victoria, Australia
| | - Radoslaw Mikolaj Sobota
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore
| | - Charles-Antoine Dutertre
- Institut National de la Santé Et de la Recherche Médicale (INSERM) U1015, Equipe Labellisée-Ligue Nationale contre le Cancer, Villejuif, France; Gustave Roussy Cancer Campus, Villejuif, France
| | - Lin-Fa Wang
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore, Singapore; Singhealth Duke-NUS Global Health Institute, Singapore, Singapore.
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11
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Abbasi M, Julner A, Lim YT, Zhao T, Sobota RM, Menéndez-Benito V. Phosphosites of the yeast centrosome component Spc110 contribute to cell cycle progression and mitotic exit. Biol Open 2022; 11:278077. [PMID: 36259662 PMCID: PMC9672857 DOI: 10.1242/bio.059565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 10/07/2022] [Indexed: 11/24/2022] Open
Abstract
Spc110 is an essential component of the spindle pole body (SPB), the yeast equivalent of the centrosome, that recruits the γ-tubulin complex to the nuclear side of the SPB to produce the microtubules that form the mitotic spindle. Here, we identified phosphosites S11 and S36 in maternally originated Spc110 and explored their functions in vivo. Yeast expressing non-phosphorylatable Spc110S11A had a distinct spindle phenotype characterised by higher levels of α-tubulin, which was frequently asymmetrically distributed between the two SPBs. Furthermore, expression of the double mutant Spc110S11AS36A had a delayed cell cycle progression. Specifically, the final steps of mitosis were delayed in Spc110S11AS36A cells, including expression and degradation of the mitotic cyclin Clb2, disassembling the mitotic spindle and re-localizing Cdc14 to the nucleoli, resulting in late mitotic exit and entry in G1. Thus, we propose that Spc110 phosphorylation at S11 and S36 is required to regulate timely cell cycle progression in budding yeast. This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Marjan Abbasi
- Department of Biosciences and Nutrition, Karolinska Institutet, SE-141 83, Huddinge, Sweden
| | - Alexander Julner
- Department of Biosciences and Nutrition, Karolinska Institutet, SE-141 83, Huddinge, Sweden
| | - Yan Ting Lim
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute for Molecular and Cell Biology (IMCB), Agency for Science, Technology, and Research (A*Star), 138 673 Proteos, Singapore
| | - Tianyun Zhao
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute for Molecular and Cell Biology (IMCB), Agency for Science, Technology, and Research (A*Star), 138 673 Proteos, Singapore
| | - Radoslaw Mikolaj Sobota
- Functional Proteomics Laboratory, SingMass National Laboratory, Institute for Molecular and Cell Biology (IMCB), Agency for Science, Technology, and Research (A*Star), 138 673 Proteos, Singapore
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12
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Goh J, Ruchti F, Poh SE, Koh WL, Tan KY, Lim YT, Thng ST, Sobota RM, Hoon SS, Liu C, O'Donoghue AJ, LeibundGut-Landmann S, Oon HH, Li H, Dawson TL. S1.3d The human pathobiont Malassezia furfur secreted protease MfSAP1 regulates cell dispersal and exacerbates skin inflammation. Med Mycol 2022. [PMCID: PMC9515860 DOI: 10.1093/mmy/myac072.s1.3d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
S1.3 Malassezia: genetics, genomics, and biology, September 21, 2022, 11:00 AM - 12:30 PM Objectives Malassezia forms the dominant eukaryotic microbial community on the human skin. The Malassezia genus possesses a repertoire of secretory hydrolytic enzymes involved in protein and lipid metabolism which alter the external cutaneous environment. The exact role of most Malassezia secreted enzymes, including those in interaction with the epithelial surface, is not well characterized. Methods and Results In this study, we compared the expression level of secreted proteases, lipases, phospholipases, and sphingomyelinases of M. globosa in healthy subjects and seborrheic dermatitis or atopic dermatitis patients. We observed upregulated gene expression of the previously characterized secretory aspartyl protease MgSAP1 in both the lesional and non-lesional skin sites of affected compared to healthy subjects. To explore the functional roles of MgSAP1 in skin disease, we generated a knockout mutant of the homologous protease MfSAP1 in the genetically tractable M. furfur. We observed the loss of MfSAP1 resulted in dramatic changes in the cell adhesion and dispersal in both culture and a human 3D reconstituted epidermis model. In a murine model of Malassezia colonization, we further demonstrated MfSAP1 contributes to inflammation as observed by reduced edema and myeloid pustule formation with the knockout mutant versus wildtype. Conclusion Taken together, we show that this dominant secretory M. aspartyl protease has an important role in enabling a planktonic cellular state that can potentially aid in colonization and additionally as a virulence factor in barrier-compromised skin, further highlighting the importance of considering the contextual relevance when evaluating the functions of secreted microbial enzymes.
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Affiliation(s)
- Joleen Goh
- A*STAR Skin Research Labs , Agency for Science, Technology and Research, Singapore , Singapore
| | - Fiorella Ruchti
- Section of Immunology , Vetsuisse Faculty, University of Zürich , Switzerland
| | - Si En Poh
- Molecular Engineering Lab , Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore , Singapore
| | - Winston L.C. Koh
- Molecular Engineering Lab , Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore , Singapore
| | - Kiat Yi Tan
- Functional Proteomics Laboratory , Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore , Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory , Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore , Singapore
| | - Steven T.G. Thng
- National Skin Centre , National Health Group, Singapore , Singapore
| | - Radoslaw M. Sobota
- Functional Proteomics Laboratory , Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore , Singapore
| | - Shawn S. Hoon
- Molecular Engineering Lab , Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore , Singapore
| | - Chenxi Liu
- Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California-San Diego, La Jolla , USA
| | - Anthony J. O'Donoghue
- Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California-San Diego, La Jolla , USA
| | | | - Hazel H. Oon
- National Skin Centre , National Health Group, Singapore , Singapore
| | - Hao Li
- Molecular Engineering Lab , Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore , Singapore
- Department of Chemistry , National University of Singapore, Singapore , Singapore
| | - Thomas L. Dawson
- A*STAR Skin Research Labs , Agency for Science, Technology and Research, Singapore , Singapore
- Department of Drug Discovery , School of Pharmacy, Medical University of South Carolina, Charleston , USA
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13
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Li GX, Zhao T, Wang LC, Choi H, Lim YT, Sobota RM. KOPI: Kinase inhibitOr Proteome Impact analysis. Sci Rep 2022; 12:13015. [PMID: 35906361 PMCID: PMC9338059 DOI: 10.1038/s41598-022-16557-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 07/12/2022] [Indexed: 11/10/2022] Open
Abstract
Kinase inhibitors often exert on/off-target effects, and efficient data analysis is essential for assessing these effects on the proteome. We developed a workflow for rapidly performing such a proteomic assessment, termed as kinase inhibitor proteome impact analysis (KOPI). We demonstrate KOPI’s utility with staurosporine (STS) on the leukemic K562 cell proteome. We identified systematically staurosporine’s non-kinome interactors, and showed for the first time that it caused paradoxical hyper- and biphasic phosphorylation.
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Affiliation(s)
- Ginny Xiaohe Li
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - Tianyun Zhao
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore.,School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Loo Chien Wang
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore
| | - Hyungwon Choi
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore.
| | - Radoslaw M Sobota
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore.
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14
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Lu Y, Sharma B, Soon WL, Shi X, Zhao T, Lim YT, Sobota RM, Hoon S, Pilloni G, Usadi A, Pervushin K, Miserez A. Complete Sequences of the Velvet Worm Slime Proteins Reveal that Slime Formation is Enabled by Disulfide Bonds and Intrinsically Disordered Regions. Adv Sci (Weinh) 2022; 9:e2201444. [PMID: 35585665 PMCID: PMC9218773 DOI: 10.1002/advs.202201444] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Revised: 04/24/2022] [Indexed: 06/02/2023]
Abstract
The slime of velvet worms (Onychophora) is a strong and fully biodegradable protein material, which upon ejection undergoes a fast liquid-to-solid transition to ensnare prey. However, the molecular mechanisms of slime self-assembly are still not well understood, notably because the primary structures of slime proteins are yet unknown. Combining transcriptomic and proteomic studies, the authors have obtained the complete primary sequences of slime proteins and identified key features for slime self-assembly. The high molecular weight slime proteins contain cysteine residues at the N- and C-termini that mediate the formation of multi-protein complexes via disulfide bonding. Low complexity domains in the N-termini are also identified and their propensity for liquid-liquid phase separation is established, which may play a central role in slime biofabrication. Using solid-state nuclear magnetic resonance, rigid and flexible domains of the slime proteins are mapped to specific peptide domains. The complete sequencing of major slime proteins is an important step toward sustainable fabrication of polymers inspired by the velvet worm slime.
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Affiliation(s)
- Yang Lu
- Centre for Sustainable Materials (SusMat)School of Materials Science and EngineeringNanyang Technological University (NTU)Singapore639798Singapore
| | - Bhargy Sharma
- Centre for Sustainable Materials (SusMat)School of Materials Science and EngineeringNanyang Technological University (NTU)Singapore639798Singapore
| | - Wei Long Soon
- Centre for Sustainable Materials (SusMat)School of Materials Science and EngineeringNanyang Technological University (NTU)Singapore639798Singapore
| | - Xiangyan Shi
- Department of BiologyShenzhen MSU‐BIT UniversityNo. 1 International University Park Road, Longgang DistrictShenzhenGuangdong Province518172P. R. China
| | - Tianyun Zhao
- Functional Proteomics LaboratoryInstitute for Molecular and Cell Biology (IMCB)Agency for Science, Technology, and Research (A*Star)ProteosSingapore138673Singapore
| | - Yan Ting Lim
- Functional Proteomics LaboratoryInstitute for Molecular and Cell Biology (IMCB)Agency for Science, Technology, and Research (A*Star)ProteosSingapore138673Singapore
| | - Radoslaw M. Sobota
- Functional Proteomics LaboratoryInstitute for Molecular and Cell Biology (IMCB)Agency for Science, Technology, and Research (A*Star)ProteosSingapore138673Singapore
| | - Shawn Hoon
- Molecular Engineering LabIMCBA*StarProteosSingapore138673Singapore
| | | | - Adam Usadi
- ExxonMobil Asia Pacific Pte LtdSingapore098633Singapore
| | - Konstantin Pervushin
- School of Biological ScienceNanyang Technological UniversitySingapore637551Singapore
| | - Ali Miserez
- Centre for Sustainable Materials (SusMat)School of Materials Science and EngineeringNanyang Technological University (NTU)Singapore639798Singapore
- School of Biological ScienceNanyang Technological UniversitySingapore637551Singapore
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15
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Xu T, Chen L, Lim YT, Zhao H, Chen H, Chen MW, Huan T, Huang Y, Sobota RM, Fang M. System Biology-Guided Chemical Proteomics to Discover Protein Targets of Monoethylhexyl Phthalate in Regulating Cell Cycle. Environ Sci Technol 2021; 55:1842-1851. [PMID: 33459556 DOI: 10.1021/acs.est.0c05832] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Chemical proteomics methods have been used as effective tools to identify novel protein targets for small molecules. These methods have great potential to be applied as environmental toxicants to figure out their mode of action. However, these assays usually generate dozens of possible targets, making it challenging to validate the most important one. In this study, we have integrated the cellular thermal shift assay (CETSA), quantitative proteomics, metabolomics, computer-assisted docking, and target validation methods to uncover the protein targets of monoethylhexyl phthalate (MEHP). Using the mass spectrometry implementation of CETSA (MS-CETSA), we have identified 74 possible protein targets of MEHP. The Gene Ontology (GO) enrichment integration was further conducted for the target proteins, the cellular dysregulated proteins, and the metabolites, showing that cell cycle dysregulation could be one primary change due to the MEHP-induced toxicity. Flow cytometry analysis confirmed that hepatocytes were arrested at the G1 stage due to the treatment with MEHP. Subsequently, the potential protein targets were ranked by their binding energy calculated from the computer-assisted docking with MEHP. In summary, we have demonstrated the development of interactomics workflow to simplify the redundant information from multiomics data and identified novel cell cycle regulatory protein targets (CPEB4, ANAPC5, and SPOUT1) for MEHP.
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Affiliation(s)
- Tengfei Xu
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
- Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, 637141 Singapore
| | - Liyan Chen
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, 61 Biopolis Drive, 138673 Singapore
| | - Yan Ting Lim
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, 61 Biopolis Drive, 138673 Singapore
| | - Haoduo Zhao
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
| | - Hongjin Chen
- Department of Pathology in the School of Basic Medical Sciences, Nanjing Medical University, Nanjing 211112, P. R. China
| | - Ming Wei Chen
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, 637551 Singapore
| | - Tao Huan
- Department of Chemistry, University of British Columbia, Vancouver Campus, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada
| | - Yichao Huang
- School of Environment, Jinan University, Guangzhou, Guangdong 511443, P. R. China
| | - Radoslaw Mikolaj Sobota
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, 61 Biopolis Drive, 138673 Singapore
| | - Mingliang Fang
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
- Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, 637141 Singapore
- Singapore Phenome Centre, Lee Kong Chian School of Medicine, Nanyang Technological University, 639798 Singapore
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16
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Xu T, Lim YT, Chen L, Zhao H, Low JH, Xia Y, Sobota RM, Fang M. A Novel Mechanism of Monoethylhexyl Phthalate in Lipid Accumulation via Inhibiting Fatty Acid Beta-Oxidation on Hepatic Cells. Environ Sci Technol 2020; 54:15925-15934. [PMID: 33225693 DOI: 10.1021/acs.est.0c01073] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Monoethylhexyl phthalate (MEHP) is one of the main active metabolites of the plasticizer di(2-ethylhexyl) phthalate. It has been known that MEHP has an impact on lipolysis; however, its mechanism on the cellular lipid metabolism remains largely unclear. Here, we first utilized global lipid profiling to fully characterize the lipid synthesis and degradation pathways upon MEHP treatment on hepatic cells. Meanwhile, we further identified the possible MEHP-targeted proteins in living cells using the cellular thermal shift assay (CETSA) method. The lipidomics results showed that there was a significant accumulation of fatty acids and other lipids in the cell. The CETSA identified 18 proteins and fatty acid β-oxidation inhibition pathways that were significantly perturbed. MEHP's binding with selected proteins HADH and HSD17B10 was further evaluated using molecule docking, and results showed that MEHP has higher affinities as compared to endogenous substrates, which was further experimentally confirmed in the surface plasma resonance interaction assay. In summary, we found a novel mechanism for MEHP-induced lipid accumulation, which was probably due to its inhibitive effects on the enzymes in fatty acid β-oxidation. This mechanism substantiates the public concerns on the high exposure level to plasticizers and their possible role as an obesogen.
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Affiliation(s)
- Tengfei Xu
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
- Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, Singapore 637141, Singapore
| | - Yan Ting Lim
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, 61 Biopolis Drive, Singapore 138673, Singapore
| | - Liyan Chen
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, 61 Biopolis Drive, Singapore 138673, Singapore
| | - Haoduo Zhao
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Jian Hui Low
- Lee Kong Chian School of Medicine, Nanyang Technological University Singapore, 11 Mandalay Road, Singapore 308232, Singapore
| | - Yun Xia
- Lee Kong Chian School of Medicine, Nanyang Technological University Singapore, 11 Mandalay Road, Singapore 308232, Singapore
| | - Radoslaw Mikolaj Sobota
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, 61 Biopolis Drive, Singapore 138673, Singapore
| | - Mingliang Fang
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
- Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, Singapore 637141, Singapore
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17
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Goh Y, Neo WT, Teo YM, Lim YT, Dewi M, Ganpathi IS, Bonney GK, Mali V, Krishnan P, Kapur J. Role of contrast-enhanced ultrasound in the evaluation of post-liver transplant vasculature. Clin Radiol 2020; 75:832-844. [PMID: 32553397 DOI: 10.1016/j.crad.2020.05.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 05/07/2020] [Indexed: 02/07/2023]
Abstract
Liver transplantation is a frequently used treatment for patients with end-stage liver disease and ultrasound is often the first-line imaging technique for detection of vascular complications after liver transplant. Although colour Doppler ultrasound is a good screening method for evaluation of post-liver transplant vasculature, it has limitations in evaluating small-calibre vessels and vessels in close proximity. Contrast-enhanced ultrasound (CEUS) has been proposed to overcome these limitations by improving visualisation of post-liver transplant vasculature and reducing the number of false-positive cases, which necessitate unnecessary additional investigations such as computed tomography or angiography. Liver transplant anatomy and the wide array of post-transplant imaging findings on colour Doppler have already been well described but literature on the use of CEUS and its image interpretation remain scarce. This review aims to discuss the indications for CEUS after liver transplant, to demonstrate CEUS technique and familiarise readers with the imaging appearances of post-transplant vascular complications on CEUS.
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Affiliation(s)
- Y Goh
- Department of Radiology, National University Hospital, Singapore.
| | - W T Neo
- Department of Radiology, National University Hospital, Singapore
| | - Y M Teo
- Department of Radiology, National University Hospital, Singapore
| | - Y T Lim
- Department of Radiology, National University Hospital, Singapore
| | - M Dewi
- Department of Radiology, National University Hospital, Singapore
| | - I S Ganpathi
- Division of Hepatobiliary & Pancreatic Surgery, National University Hospital, Singapore
| | - G K Bonney
- Division of Hepatobiliary & Pancreatic Surgery, National University Hospital, Singapore
| | - V Mali
- Department of Paediatric Surgery, National University Hospital, Singapore
| | - P Krishnan
- Department of Paediatric Surgery, National University Hospital, Singapore
| | - J Kapur
- Department of Radiology, National University Hospital, Singapore.
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18
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Dziekan JM, Wirjanata G, Dai L, Go KD, Yu H, Lim YT, Chen L, Wang LC, Puspita B, Prabhu N, Sobota RM, Nordlund P, Bozdech Z. Cellular thermal shift assay for the identification of drug-target interactions in the Plasmodium falciparum proteome. Nat Protoc 2020; 15:1881-1921. [PMID: 32341577 DOI: 10.1038/s41596-020-0310-z] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 01/13/2020] [Indexed: 02/06/2023]
Abstract
Despite decades of research, little is known about the cellular targets and the mode of action of the vast majority of antimalarial drugs. We recently demonstrated that the cellular thermal shift assay (CETSA) protocol in its two variants: the melt curve and the isothermal dose-response, represents a comprehensive strategy for the identification of antimalarial drug targets. CETSA enables proteome-wide target screening for unmodified antimalarial compounds with undetermined mechanisms of action, providing quantitative evidence about direct drug-protein interactions. The experimental workflow involves treatment of P. falciparum-infected erythrocytes with a compound of interest, heat exposure to denature proteins, soluble protein isolation, enzymatic digestion, peptide labeling with tandem mass tags, offline fractionation, and liquid chromatography-tandem mass spectrometry analysis. Methodological optimizations necessary for the analysis of this intracellular parasite are discussed, including enrichment of parasitized cells and hemoglobin depletion strategies to overcome high hemoglobin abundance in the host red blood cells. We outline an effective data processing workflow using the mineCETSA R package, which enables prioritization of drug-target candidates for follow-up studies. The entire protocol can be completed within 2 weeks.
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Affiliation(s)
- Jerzy Michal Dziekan
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Grennady Wirjanata
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Lingyun Dai
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore.,The Second Clinical Medical College of Jinan University, First Affiliated Hospital of Southern University of Science and Technology, Shenzhen People's Hospital, Shenzhen, China
| | - Ka Diam Go
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Han Yu
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Yan Ting Lim
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.,Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Liyan Chen
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.,Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Loo Chien Wang
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.,Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Brenda Puspita
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Nayana Prabhu
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Radoslaw M Sobota
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore. .,Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.
| | - Pär Nordlund
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore. .,Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore. .,Department of Oncology and Pathology, Karolinska Institutet, Stockholm, Sweden.
| | - Zbynek Bozdech
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore.
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19
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Sun W, Dai L, Yu H, Puspita B, Zhao T, Li F, Tan JL, Lim YT, Chen MW, Sobota RM, Tenen DG, Prabhu N, Nordlund P. Monitoring structural modulation of redox-sensitive proteins in cells with MS-CETSA. Redox Biol 2019; 24:101168. [PMID: 30925293 PMCID: PMC6439307 DOI: 10.1016/j.redox.2019.101168] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 03/07/2019] [Accepted: 03/10/2019] [Indexed: 12/31/2022] Open
Abstract
Reactive oxygen species (ROS) induce different cellular stress responses but can also mediate cellular signaling. Augmented levels of ROS are associated with aging, cancer as well as various metabolic and neurological disorders. ROS can also affect the efficacy and adverse effects of drugs. Although proteins are key mediators of most ROS effects, direct studies of ROS-modulated-protein function in the cellular context are very challenging. Therefore the understanding of specific roles of different proteins in cellular ROS responses is still relatively rudimentary. In the present work we show that Mass Spectrometry-Cellular Thermal Shift Assay (MS-CETSA) can directly monitor ROS and redox modulations of protein structure at the proteome level. By altering ROS levels in cultured human hepatocellular carcinoma cell lysates and intact cells, we detected CETSA responses in many proteins known to be redox sensitive, and also revealed novel candidate ROS sensitive proteins. Studies in intact cells treated with hydrogen peroxide and sulfasalazine, a ROS modulating drug, identified not only proteins that are directly modified, but also proteins reporting on downstream cellular effects. Comprehensive changes are seen on rate-limiting proteins regulating key cellular processes, including known redox control systems, protein degradation, epigenetic control and protein translational processes. Interestingly, concerted shifts on ATP-binding proteins revealed redox-induced modulation of ATP levels, which likely control many cellular processes. Collectively, these studies establish CETSA as a novel method for cellular studies of redox modulations of proteins, which implicated in a wide range of processes and for the discovery of CETSA-based biomarkers reporting on the efficacy as well as adverse effects of drugs.
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Affiliation(s)
- Wendi Sun
- School of Biological Sciences, Nanyang Technological University, 637551, Singapore
| | - Lingyun Dai
- School of Biological Sciences, Nanyang Technological University, 637551, Singapore
| | - Han Yu
- School of Biological Sciences, Nanyang Technological University, 637551, Singapore
| | - Brenda Puspita
- School of Biological Sciences, Nanyang Technological University, 637551, Singapore
| | - Tianyun Zhao
- School of Biological Sciences, Nanyang Technological University, 637551, Singapore
| | - Feng Li
- Cancer Science Institute of Singapore, National University of Singapore, Singapore 117599, Singapore
| | - Justin L Tan
- Cancer Science Institute of Singapore, National University of Singapore, Singapore 117599, Singapore; Genome Institute of Singapore, A*STAR, 138672, Singapore
| | - Yan Ting Lim
- School of Biological Sciences, Nanyang Technological University, 637551, Singapore
| | - Ming Wei Chen
- School of Biological Sciences, Nanyang Technological University, 637551, Singapore
| | | | - Daniel G Tenen
- Cancer Science Institute of Singapore, National University of Singapore, Singapore 117599, Singapore; Harvard Stem Cell Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Nayana Prabhu
- School of Biological Sciences, Nanyang Technological University, 637551, Singapore
| | - Pär Nordlund
- School of Biological Sciences, Nanyang Technological University, 637551, Singapore; Institute of Molecular and Cell Biology, A*STAR, 138673, Singapore; Department of Oncology and Pathology, Karolinska Institutet, Stockholm, 17177, Sweden.
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Lim YT, Prabhu N, Dai L, Go KD, Chen D, Sreekumar L, Egeblad L, Eriksson S, Chen L, Veerappan S, Teo HL, Tan CSH, Lengqvist J, Larsson A, Sobota RM, Nordlund P. An efficient proteome-wide strategy for discovery and characterization of cellular nucleotide-protein interactions. PLoS One 2018; 13:e0208273. [PMID: 30521565 PMCID: PMC6283526 DOI: 10.1371/journal.pone.0208273] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 11/14/2018] [Indexed: 12/03/2022] Open
Abstract
Metabolite-protein interactions define the output of metabolic pathways and regulate many cellular processes. Although diseases are often characterized by distortions in metabolic processes, efficient means to discover and study such interactions directly in cells have been lacking. A stringent implementation of proteome-wide Cellular Thermal Shift Assay (CETSA) was developed and applied to key cellular nucleotides, where previously experimentally confirmed protein-nucleotide interactions were well recaptured. Many predicted, but never experimentally confirmed, as well as novel protein-nucleotide interactions were discovered. Interactions included a range of different protein families where nucleotides serve as substrates, products, co-factors or regulators. In cells exposed to thymidine, a limiting precursor for DNA synthesis, both dose- and time-dependence of the intracellular binding events for sequentially generated thymidine metabolites were revealed. Interactions included known cancer targets in deoxyribonucleotide metabolism as well as novel interacting proteins. This stringent CETSA based strategy will be applicable for a wide range of metabolites and will therefore greatly facilitate the discovery and studies of interactions and specificities of the many metabolites in human cells that remain uncharacterized.
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Affiliation(s)
- Yan Ting Lim
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Nayana Prabhu
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Lingyun Dai
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Ka Diam Go
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Dan Chen
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Lekshmy Sreekumar
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Louise Egeblad
- Department of Anatomy, Physiology and Biochemistry, The Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Staffan Eriksson
- Department of Oncology and Pathology, Karolinska Institutet, Stockholm, Sweden
| | - Liyan Chen
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Saranya Veerappan
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Hsiang Ling Teo
- NTU Institute of Structural Biology, Nanyang Technological University, Singapore, Singapore
| | - Chris Soon Heng Tan
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore
| | - Johan Lengqvist
- Department of Oncology and Pathology, Karolinska Institutet, Stockholm, Sweden
| | - Andreas Larsson
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Radoslaw M. Sobota
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore
- * E-mail: (PN); (RMS)
| | - Pär Nordlund
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Department of Oncology and Pathology, Karolinska Institutet, Stockholm, Sweden
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore, Singapore
- * E-mail: (PN); (RMS)
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Dai L, Zhao T, Bisteau X, Sun W, Prabhu N, Lim YT, Sobota R, Kaldis P, Nordlund P. Abstract 4303: Modulation of protein interaction states through the cell cycle. Cancer Res 2018. [DOI: 10.1158/1538-7445.am2018-4303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Global profiling of protein expression through the cell cycle has revealed subsets of periodically expressed proteins. However, expression levels alone only give a partial view of processes determining cellular events. The cell cycle progression events are to a large extent controlled by the dynamic biochemical interactions of proteins with physiological ligands such as other proteins, metabolites, lipids, nucleic acids or low molecular weight effectors. Using a proteome-wide implementation of the Cellular Thermal Shift Assay (CETSA) to study specific cell cycle phases in K562 cell, we uncover modulations of interaction states for more than 750 proteins along the cell cycle. Notably, many protein complexes are modulated in specific cell cycle phases, reflecting their roles in processes such as DNA replication, chromatin remodeling, transcription, translation, and nuclear membrane decomposition. Surprisingly, only small differences in interaction states were seen between G1 and G2 phases, suggesting similar hardwiring of biochemical processes in these two phases. The present work reveals novel molecular details of the cell cycle. CETSA, therefore emerge as a novel approach to discover cellular modulations during cancer development and therapy.
Citation Format: Lingyun Dai, Tianyun Zhao, Xavier Bisteau, Wendi Sun, Nayana Prabhu, Yan Ting Lim, Radoslaw Sobota, Philipp Kaldis, Pär Nordlund. Modulation of protein interaction states through the cell cycle [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr 4303.
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Affiliation(s)
- Lingyun Dai
- 1Nanyang Technological University, Singapore, Singapore
| | - Tianyun Zhao
- 1Nanyang Technological University, Singapore, Singapore
| | - Xavier Bisteau
- 2Institute of Molecular and Cell Biology, A*STAR, Singapore, Singapore
| | - Wendi Sun
- 1Nanyang Technological University, Singapore, Singapore
| | - Nayana Prabhu
- 1Nanyang Technological University, Singapore, Singapore
| | - Yan Ting Lim
- 1Nanyang Technological University, Singapore, Singapore
| | - Radoslaw Sobota
- 2Institute of Molecular and Cell Biology, A*STAR, Singapore, Singapore
| | - Philipp Kaldis
- 2Institute of Molecular and Cell Biology, A*STAR, Singapore, Singapore
| | - Pär Nordlund
- 1Nanyang Technological University, Singapore, Singapore
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Dai L, Zhao T, Bisteau X, Sun W, Prabhu N, Lim YT, Sobota RM, Kaldis P, Nordlund P. Modulation of Protein-Interaction States through the Cell Cycle. Cell 2018; 173:1481-1494.e13. [PMID: 29706543 DOI: 10.1016/j.cell.2018.03.065] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 01/25/2018] [Accepted: 03/26/2018] [Indexed: 11/25/2022]
Abstract
Global profiling of protein expression through the cell cycle has revealed subsets of periodically expressed proteins. However, expression levels alone only give a partial view of the biochemical processes determining cellular events. Using a proteome-wide implementation of the cellular thermal shift assay (CETSA) to study specific cell-cycle phases, we uncover changes of interaction states for more than 750 proteins during the cell cycle. Notably, many protein complexes are modulated in specific cell-cycle phases, reflecting their roles in processes such as DNA replication, chromatin remodeling, transcription, translation, and disintegration of the nuclear envelope. Surprisingly, only small differences in the interaction states were seen between the G1 and the G2 phase, suggesting similar hardwiring of biochemical processes in these two phases. The present work reveals novel molecular details of the cell cycle and establishes proteome-wide CETSA as a new strategy to study modulation of protein-interaction states in intact cells.
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Affiliation(s)
- Lingyun Dai
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Tianyun Zhao
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Xavier Bisteau
- Institute of Molecular and Cell Biology, A(∗)STAR, Singapore 138673, Singapore
| | - Wendi Sun
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Nayana Prabhu
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Yan Ting Lim
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Radoslaw M Sobota
- Institute of Molecular and Cell Biology, A(∗)STAR, Singapore 138673, Singapore; Institute of Medical Biology, A(∗)STAR, Singapore 138648, Singapore
| | - Philipp Kaldis
- Institute of Molecular and Cell Biology, A(∗)STAR, Singapore 138673, Singapore; Department of Biochemistry, National University of Singapore, Singapore 117597, Singapore
| | - Pär Nordlund
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore; Institute of Molecular and Cell Biology, A(∗)STAR, Singapore 138673, Singapore; Department of Oncology and Pathology, Karolinska Institutet, 17177 Stockholm, Sweden.
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Tan CSH, Go KD, Bisteau X, Dai L, Yong CH, Prabhu N, Ozturk MB, Lim YT, Sreekumar L, Lengqvist J, Tergaonkar V, Kaldis P, Sobota RM, Nordlund P. Thermal proximity coaggregation for system-wide profiling of protein complex dynamics in cells. Science 2018; 359:1170-1177. [DOI: 10.1126/science.aan0346] [Citation(s) in RCA: 104] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 09/28/2017] [Accepted: 01/27/2018] [Indexed: 01/20/2023]
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Sreekumar LKU, Lim YT, Veerappan S, Nordlund P. Abstract 2045: Exploring the potential of cellular thermal shift assay (CETSA) to study drug resistance during cancer therapy. Cancer Res 2017. [DOI: 10.1158/1538-7445.am2017-2045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The aim of this project is to understand the various mechanisms contributing to drug resistance development in cancer therapy.
The efficacy of therapeutics is dependent on a drug binding to its target. We have developed a method that allows for the first time to directly evaluate drug binding to target proteins in cells and tissue samples the cellular thermal shift assay (CETSA) (Martinez Molina et al. Science, 341:84). CETSA is based on the biophysical principle of ligand-induced thermal stabilization of target proteins. By monitoring the drug occupancy in the target protein, CETSA can be used to study processes of drug transport and metabolism in cancer cells. We have used CETSA to study the acquired drug resistance of, antifolate and fluropyrimidine drugs in pairs of parental and resistant cell lines. CETSA shifts and isothermal dose response fingerprint (ITDRF) were used to study the relative drug target engagement in these cells. Quantitative mass spectrometry was used to monitor differences in protein expression levels across the cell lines.
Based on the CETSA measurements, resistant cells clearly showed a higher drug dose threshold as compared to the parent cell lines, typically requiring 8-50 times higher dose to establish similar target engagement. Several potential mechanism for drug resistant emerged - we, for example, observed up-regulation of thymidylate synthase and down regulation of reduced folate carrier (RFC) protein associated with antifolate transport, in some resistant cell lines.
The data supports that CETSA is a potential valuable tool to dissect various mechanisms those contribute to resistant development in cancer cells.
Citation Format: Lekshmy Kunjamma Usha Sreekumar, Yan Ting Lim, Saranya Veerappan, Par Nordlund. Exploring the potential of cellular thermal shift assay (CETSA) to study drug resistance during cancer therapy [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 2045. doi:10.1158/1538-7445.AM2017-2045
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Affiliation(s)
| | - Yan Ting Lim
- Nanyang Technological University, Singapore, Singapore
| | | | - Par Nordlund
- Nanyang Technological University, Singapore, Singapore
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Nordlund P, Lööf S, Laursen H, Öberg A, Lengqvist J, Jafari R, Dai L, Go KDI, Prabhu N, Sobota R, Larsson A, Jansson A, Soon CHT, Sreekumar L, Lim YT, Martines Molina D. Abstract 4386: CETSA as a new strategy to understand efficacy, adverse effects and resistance development of anticancer drugs. Cancer Res 2016. [DOI: 10.1158/1538-7445.am2016-4386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
A key step of the action of most drugs is their binding (engagement) of the target protein(s). However, limitations in the available methods for directly accessing this critical step have added uncertainties in many stages of drug development.
We have developed a generic method for evaluating drug binding to target proteins in cells and tissues (Martinez Molina et al. Science, 341:84). The technique is based on the physical phenomenon of ligand-induced thermal stabilization of target proteins; the method is therefore called the cellular thermal shift assay (CETSA). The technique allows for the first time to directly measure the biophysical interactions between a drug and protein target in non- engineered cells and tissues. We show that using CETSA a range of critical factors for drug development can be addressed at the target engagement level, including drug transport and activation, off-target effects, drug resistance as well as drug distribution in cells, patient and animal tissues. Using quantitative mass-spectrometry, proteome-wide CETSA has been established which allows for off-target effects as well as downstream biochemistry to be discovered (Savitsk et al. Science, 346, 6205:1255784). Together the data supports that CETSA is likely to become a valuable tool for developing and understanding the action of cancer drugs in the future.
Citation Format: Pär Nordlund, Sara Lööf, Henritte Laursen, Anette Öberg, Johan Lengqvist, Rozbeh Jafari, Lingyun Dai, Ka DIam Go, Nayana Prabhu, Radoslaw Sobota, Andreas Larsson, Anna Jansson, Chris Heng Tan Soon, Lekshmy Sreekumar, Yan Ting Lim, Daniel Martines Molina. CETSA as a new strategy to understand efficacy, adverse effects and resistance development of anticancer drugs. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 4386.
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Affiliation(s)
| | - Sara Lööf
- 1Karolinska Institutet, Stockholm, Sweden
| | | | | | | | | | - Lingyun Dai
- 2Nanyang Technological University, Singapore, Singapore
| | - Ka DIam Go
- 2Nanyang Technological University, Singapore, Singapore
| | - Nayana Prabhu
- 2Nanyang Technological University, Singapore, Singapore
| | | | | | - Anna Jansson
- 2Nanyang Technological University, Singapore, Singapore
| | | | | | - Yan Ting Lim
- 2Nanyang Technological University, Singapore, Singapore
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26
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Lim YT, Jobichen C, Wong J, Limmathurotsakul D, Li S, Chen Y, Raida M, Srinivasan N, MacAry PA, Sivaraman J, Gan YH. Extended loop region of Hcp1 is critical for the assembly and function of type VI secretion system in Burkholderia pseudomallei. Sci Rep 2015; 5:8235. [PMID: 25648885 PMCID: PMC4650826 DOI: 10.1038/srep08235] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 01/13/2015] [Indexed: 11/09/2022] Open
Abstract
The Type VI Secretion System cluster 1 (T6SS1) is essential for the pathogenesis of Burkholderia pseudomallei, the causative agent of melioidosis, a disease endemic in the tropics. Inside host cells, B. pseudomallei escapes into the cytosol and through T6SS1, induces multinucleated giant cell (MNGC) formation that is thought to be important for bacterial cell to cell spread. The hemolysin-coregulated protein (Hcp) is both a T6SS substrate, as well as postulated to form part of the T6SS secretion tube. Our structural study reveals that Hcp1 forms hexameric rings similar to the other Hcp homologs but has an extended loop (Asp40-Arg56) that deviates significantly in position compared to other Hcp structures and may act as a key contact point between adjacent hexameric rings. When two residues within the loop were mutated, the mutant proteins were unable to stack as dodecamers, suggesting defective tube assembly. Moreover, infection with a bacterial mutant containing in situ substitution of these hcp1 residues abolishes Hcp1 secretion inside infected cells and MNGC formation. We further show that Hcp has the ability to preferentially bind to the surface of antigen-presenting cells, which may contribute to its immunogenicity in inducing high titers of antibodies seen in melioidosis patients.
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Affiliation(s)
- Yan Ting Lim
- 1] Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore [2] NUS Graduate School of Integrative Sciences and Engineering, National University of Singapore, Singapore [3] Life Sciences Institute, Immunology Program, National University of Singapore, Singapore
| | - Chacko Jobichen
- Department of Biological Sciences, National University of Singapore, Singapore
| | - Jocelyn Wong
- 1] Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore [2] NUS Graduate School of Integrative Sciences and Engineering, National University of Singapore, Singapore
| | - Direk Limmathurotsakul
- Department of Tropical Hygiene and Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Shaowei Li
- National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, China
| | - Yahua Chen
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Manfred Raida
- Life Sciences Institute, Singapore Lipidomics Incubator, National University of Singapore, Singapore
| | - Nalini Srinivasan
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Paul Anthony MacAry
- 1] Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore [2] Life Sciences Institute, Immunology Program, National University of Singapore, Singapore
| | - J Sivaraman
- Department of Biological Sciences, National University of Singapore, Singapore
| | - Yunn-Hwen Gan
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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Park HJ, Park M, Han M, Nam BH, Koh KN, Im HJ, Lee JW, Chung NG, Cho B, Kim HK, Yoo KH, Koo HH, Kang HJ, Shin HY, Ahn HS, Lim YT, Kook H, Lyu CJ, Hah JO, Park JE, Lim YJ, Seo JJ. Efficacy and safety of micafungin for the prophylaxis of invasive fungal infection during neutropenia in children and adolescents undergoing allogeneic hematopoietic SCT. Bone Marrow Transplant 2014; 49:1212-6. [PMID: 25000455 DOI: 10.1038/bmt.2014.136] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Revised: 05/12/2014] [Accepted: 05/18/2014] [Indexed: 11/09/2022]
Abstract
The objective of this study was to evaluate the efficacy and safety of micafungin for the prevention of invasive fungal infection (IFI) during the neutropenic phase of allogeneic hematopoietic SCT (allo-HSCT) in children and adolescents. This was a prospective, multicenter, open-label, single-arm study. Micafungin was administered i.v. at a dose of 1 mg/kg/day (max 50 mg) from the beginning of conditioning until neutrophil engraftment. Treatment success was defined as the absence of proven, probable, possible or suspected IFI through to 4 weeks after therapy. From April 2010 to December 2011, 155 patients were enrolled from 11 institutions in Korea, and 147 patients were analyzed. Of the 147 patients, 121 (82.3%) completed the protocol without premature interruption. Of the 132 patients in whom micafungin efficacy could be evaluated, treatment success was achieved in 119 patients (90.2%). There was no proven fungal infection in any patient. The number of patients with probable, possible and suspected IFI was two, two and nine, respectively. Thirty-five patients (23.8%) experienced 109 adverse events (AEs) possibly related to micafungin. No patients experienced grade IV AEs. Two patients (1.4%) discontinued micafungin administration due to adverse effects. None of the deaths were related to the study drug.
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Affiliation(s)
- H J Park
- Center for Pediatric Oncology, National Cancer Center, Goyang-si, Republic of Korea
| | - M Park
- Department of Pediatrics, Chungbuk National University College of Medicine, Cheongju, Republic of Korea
| | - M Han
- Clinical Research Center, National Cancer Center, Goyang-si, Republic of Korea
| | - B H Nam
- Clinical Research Center, National Cancer Center, Goyang-si, Republic of Korea
| | - K N Koh
- Department of Pediatrics, Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - H J Im
- Department of Pediatrics, Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - J W Lee
- Department of Pediatrics, Seoul St Mary's Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - N-G Chung
- Department of Pediatrics, Seoul St Mary's Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - B Cho
- Department of Pediatrics, Seoul St Mary's Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - H-K Kim
- Department of Pediatrics, Seoul St Mary's Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - K H Yoo
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - H H Koo
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - H J Kang
- Department of Pediatrics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - H Y Shin
- Department of Pediatrics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - H S Ahn
- Department of Pediatrics, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Y T Lim
- Department of Pediatrics, Pusan National University College of Medicine, Busan, Republic of Korea
| | - H Kook
- Department of Pediatrics, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - C J Lyu
- Department of Pediatrics, Yonsei University, College of Medicine, Seoul, Republic of Korea
| | - J O Hah
- Department of Pediatrics, Yeungnam University College of Medicine, Daegu, Republic of Korea
| | - J E Park
- Department of Pediatrics, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Y J Lim
- Department of Pediatrics, Chungnam National University School of Medicine, Daejon, Republic of Korea
| | - J J Seo
- Department of Pediatrics, Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, Seoul, Republic of Korea
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Jovanović V, Abdul Aziz N, Lim YT, Ng Ai Poh A, Jin Hui Chan S, Ho Xin Pei E, Lew FC, Shui G, Jenner AM, Bowen L, McKinney EF, Lyons PA, Kemeny MD, Smith KGC, Wenk MR, MacAry PA. Lipid anti-lipid antibody responses correlate with disease activity in systemic lupus erythematosus. PLoS One 2013; 8:e55639. [PMID: 23409013 PMCID: PMC3567138 DOI: 10.1371/journal.pone.0055639] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 12/28/2012] [Indexed: 12/17/2022] Open
Abstract
Systemic lupus erythematosus (SLE) is a chronic autoimmune disorder characterized by broad clinical manifestations including cardiovascular and renal complications with periodic disease flares and significant morbidity and mortality. One of the main contributing factors to the pathology of SLE is the accumulation and impaired clearance of immune complexes of which the principle components are host auto-antigens and antibodies. The contribution of host lipids to the formation of these autoimmune complexes remains poorly defined. The aim of the present study was to identify and analyze candidate lipid autoantigens and their corresponding anti-lipid antibody responses in a well-defined SLE patient cohort using a combination of immunological and biophysical techniques. Disease monitoring in the SLE cohort was undertaken with serial British Isles Lupus Assessment Group (BILAG) scoring. Correlations between specific lipid/anti-lipid responses were investigated as disease activity developed from active flares to quiescent during a follow up period. We report a significant negative correlation between anti-lipid antibodies for 24S-hydroxycholesterol, cardiolipin and phosphatidylserine with SLE disease activity. Taken together, these data suggest that lipid autoantigens represent a new family of biomarkers that can be employed to monitor disease activity plus the efficacy of therapeutic intervention in SLE.
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Affiliation(s)
- Vojislav Jovanović
- Immunology Programme and Department of Microbiology, National University of Singapore, Singapore
| | - Nurhuda Abdul Aziz
- Immunology Programme and Department of Microbiology, National University of Singapore, Singapore
| | - Yan Ting Lim
- Immunology Programme and Department of Microbiology, National University of Singapore, Singapore
| | - Amanda Ng Ai Poh
- Immunology Programme and Department of Microbiology, National University of Singapore, Singapore
| | - Sherlynn Jin Hui Chan
- Immunology Programme and Department of Microbiology, National University of Singapore, Singapore
| | - Eliza Ho Xin Pei
- Immunology Programme and Department of Microbiology, National University of Singapore, Singapore
| | - Fei Chuin Lew
- Immunology Programme and Department of Microbiology, National University of Singapore, Singapore
| | - Guanghou Shui
- Department of Biochemistry, National University of Singapore, Singapore
| | - Andrew M. Jenner
- School of Biological Sciences, Illawara Health and Medical Research Institute, University of Wollongong, Australia
| | - Li Bowen
- Department of Biochemistry, National University of Singapore, Singapore
| | - Eoin F. McKinney
- Cambridge Institute for Medical Research, Cambridge, United Kingdom
- Department of Medicine, University of Cambridge, School of Clinical Medicine, Addenbrooke’s Hospital, Cambridge, United Kingdom
| | - Paul A. Lyons
- Cambridge Institute for Medical Research, Cambridge, United Kingdom
- Department of Medicine, University of Cambridge, School of Clinical Medicine, Addenbrooke’s Hospital, Cambridge, United Kingdom
| | - Michael D. Kemeny
- Immunology Programme and Department of Microbiology, National University of Singapore, Singapore
| | - Kenneth G. C. Smith
- Cambridge Institute for Medical Research, Cambridge, United Kingdom
- Department of Medicine, University of Cambridge, School of Clinical Medicine, Addenbrooke’s Hospital, Cambridge, United Kingdom
| | - Markus R. Wenk
- Department of Biochemistry, National University of Singapore, Singapore
| | - Paul A. MacAry
- Immunology Programme and Department of Microbiology, National University of Singapore, Singapore
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Cooney MT, Reiner Z, Sheu W, Ryden L, Sutter JD, De Bacquer D, DeBacker G, Mithal A, Chung N, Lim YT, Dudina A, Reynolds A, Dunney K, Graham I. SURF – SUrvey of Risk Factor management: first report of an international audit. Eur J Prev Cardiol 2012; 21:813-22. [DOI: 10.1177/2047487312467870] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- MT Cooney
- Adelaide Meath Hospital, Dublin, Ireland
| | - Z Reiner
- University Hospital Centre, Zagreb, Croatia
| | - W Sheu
- Taichung Veterans General Hospital, Taiwan
| | - L Ryden
- Karolinska Institute, Stockholm, Sweden
| | - J de Sutter
- AZ Maria Middelares Hospital, Ghent, Belgium
| | | | | | | | - N Chung
- Yonsei Cardiovascular Research Institute, Seoul, Korea
| | - YT Lim
- Parkway Mount Elizabeth Hospital, Singapore
| | - A Dudina
- Adelaide Meath Hospital, Dublin, Ireland
| | - A Reynolds
- Adelaide Meath Hospital, Dublin, Ireland
| | - K Dunney
- Adelaide Meath Hospital, Dublin, Ireland
| | - I Graham
- Adelaide Meath Hospital, Dublin, Ireland
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Jovanovic V, Ng Ai Poh A, Ho Xin Pei E, Lim YT, Abdul Aziz N, McKinney E, Lyons P, Smith K, MacAry P, Kemeny M, Wenk M. Anti-lipid response in Systemic Lupus Erythematosus (44.4). The Journal of Immunology 2011. [DOI: 10.4049/jimmunol.186.supp.44.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Systemic Lupus Erythematosus (SLE) is a chronic, multisystem, autoimmune disorder with a broad range of clinical presentations. One of the main factors, proposed to contribute to the development of clinical manifestations of SLE is accumulation and impaired clearance of immune complexes. The aim of the present study was to investigate lipid and anti-lipid antibody profiles in SLE patients’ plasma using ELISA and gas chromatography-mass spectrometry (GC-MS). The SLE cohort employed in this study is composed of 24 subjects and disease monitoring was undertaken with serial BILAG disease scoring. The blood was collected at three time points: at the moment of flare; and 3-months/12-months after treatment had started. For oxysterols (7α-hydroxycholesterol, 7β-hydroxycholesterol, 7-ketocholesterol) we report a trend where lipid levels and corresponding anti-lipid IgG concentrations are significantly reduced during the course of treatment. For phospholipids (oxidized phosphatidylcholine, cardiolipin) we also show high levels of anti-lipid IgG during flare or active disease. Using GC-MS and ELISA we have confirmed an association of high lipid levels and high anti-lipid IgG level with disease flare in comparison to 12 months after the commencement of treatment. We propose that auto anti-lipid IgGs should now be considered a component of the accumulated immune complexes in SLE and thus may contribute to disease pathogenesis.
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Affiliation(s)
- Vojislav Jovanovic
- 1Microbiology Department, National University of Singapore, Singapore, Singapore
| | - Amanda Ng Ai Poh
- 1Microbiology Department, National University of Singapore, Singapore, Singapore
| | - Eliza Ho Xin Pei
- 1Microbiology Department, National University of Singapore, Singapore, Singapore
| | - Yan Ting Lim
- 1Microbiology Department, National University of Singapore, Singapore, Singapore
| | - Nurhuda Abdul Aziz
- 1Microbiology Department, National University of Singapore, Singapore, Singapore
| | - Eoin McKinney
- 2Cambridge Institute for Medical Research, Cambridge, United Kingdom
- 3Department of Medicine, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom
| | - Paul Lyons
- 2Cambridge Institute for Medical Research, Cambridge, United Kingdom
- 3Department of Medicine, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom
| | - Kenneth Smith
- 2Cambridge Institute for Medical Research, Cambridge, United Kingdom
- 3Department of Medicine, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom
| | - Paul MacAry
- 1Microbiology Department, National University of Singapore, Singapore, Singapore
| | - Michael Kemeny
- 1Microbiology Department, National University of Singapore, Singapore, Singapore
| | - Markus Wenk
- 4Department of Biochemistry, National University of Singapore, Singapore, Singapore
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Zhou Y, Gan SU, Lin G, Lim YT, Masilamani J, Mustafa FB, Phua ML, Rivino L, Phan TT, Lee KO, Calne R, MacAry PA. Characterization of human umbilical cord lining-derived epithelial cells and transplantation potential. Cell Transplant 2011; 20:1827-41. [PMID: 21439131 DOI: 10.3727/096368910x564085] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
In this study we describe the derivation and immunological characterization of a primary epithelial cell type from the human umbilical cord membrane. These cord lining epithelial cells (CLECs) expressed and/or secreted isoforms of the nonclassical human leukocyte antigen class I (HLA-1b) glycoproteins, HLA-G and E. Conditioned media from CLECs inhibited mitogen-stimulated T-lymphocyte responses, and in a mixed leukocyte reaction (MLR) assay, cocultured CLECs inhibited allogeneic responses with a concomitant reduction in proinflammatory cytokines. Using a transwell coculture system, it was demonstrated that these immunoregulatory effects were mediated by soluble factors secreted by CLECs, in a dose-dependent manner. Functional studies using HLA-G blocking antibody showed that the effects of CLEC-secreted products could be inhibited, thus demonstrating a significant and important role for soluble HLA-G. In vivo, we show that transplanted CLECs could be maintained for extended periods in immunocompetent mice where xenorejection rapidly destroyed primary keratinocytes, a control human epithelial cell type. Additionally, CLECs delayed the rejection of keratinocytes and extended their survival when cotransplanted, indicating an ability to protect adjacent human cell types that would otherwise be rejected if transplanted alone. We also show that CLECs transduced with a modified human proinsulin gene were transplanted intraperitoneally into streptozotocin (STZ)-induced diabetic mice, resulting in significantly lower levels of serum glucose compared to control mice. This study has characterized the immunological properties of CLECs and tested a potential therapeutic application in the treatment of a type 1 diabetes mouse model.
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Affiliation(s)
- Yue Zhou
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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Harewood GC, Murray F, Patchett S, Garcia L, Leong WL, Lim YT, Prabakaran S, Yeen KF, O'Flynn J, McNally E. Assessment of colorectal cancer knowledge and patient attitudes towards screening: is Ireland ready to embrace colon cancer screening? Ir J Med Sci 2008; 178:7-12. [PMID: 18584273 DOI: 10.1007/s11845-008-0163-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2007] [Accepted: 04/14/2008] [Indexed: 02/08/2023]
Abstract
INTRODUCTION The level of awareness among the Irish public regarding colorectal cancer (CRC) remains uncertain. This study aimed to characterise CRC knowledge levels among a cohort of Irish patients. METHODS A survey evaluating CRC knowledge levels was distributed among outpatients at a gastroenterology clinic in a Dublin teaching hospital. RESULTS In total, 472 surveys were distributed of which 465 (98.5%) were returned. Twenty-nine percent of respondents correctly judged CRC to be the commonest cause of cancer death among the options provided while 26% correctly judged the lifetime risk of CRC; 59% underestimated and 15% overestimated the risk. Most patients (91%) were willing to pay 300 euros for a prompt colonoscopy if recommended by their physician while 7% opted to wait 6 months for a free colonoscopy. CONCLUSIONS There is a willingness to embrace CRC screening and to shoulder some of the financial burden that this entails.
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Affiliation(s)
- G C Harewood
- Department of Gastroenterology, Beaumont Hospital Dublin, Dublin, Ireland.
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Tan IL, Tan HC, Teo SG, Lim YT. Simultaneous thromboses of multiple coronary arteries in acute myocardial infarction. Singapore Med J 2006; 47:240-2. [PMID: 16518562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Simultaneous thrombotic occlusion of multiple coronary arteries in acute myocardial infarction is a well-recognised phenomenon. Studies have reported diffuse destabilisation of atherosclerotic plaques in patients with acute myocardial infarction, leading to the concept of "pan-coronaritis". The putative mechanism is attributed to a systemic thrombophilic and inflammatory state. We report the occurrence of this phenomenon in two middle-aged male patients.
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Affiliation(s)
- I L Tan
- Cardiac Department, National University Hospital, 5 Lower Kent Ridge Road, Singapore 119074
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Poh KK, Tan HC, Yip JWL, Lim YT. ReoPro Observational Registry (RAPOR): insights from the multicentre use of abciximab in Asia. Singapore Med J 2005; 46:407-13. [PMID: 16049611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
INTRODUCTION The pattern of use of abciximab in real-life clinical patients undergoing percutaneous coronary intervention (PCI) in 11 high-volume centres in Singapore, Malaysia, Thailand, Philippines, India, Pakistan and Korea was prospectively examined. METHODS These centres enrolled 224 consecutive patients over eight months to receive abciximab during PCI for the study. The cohort consisted of 82.1 percent males, with mean age of 55 (+/- 11) years and mean weight of 67 (+/- 17) kg. RESULTS The use of abciximab during PCI ranged between 6.2 percent and 21.6 percent. The indications for the use of abciximab were: acute coronary syndromes (34.3 percent), complex coronary lesions (17.9 percent) and multivessel PCI (17.7 percent). Based on a risk scoring system devised for this registry, majority (60.0 percent) of the patients was considered high risk when abciximab was used. Among the patients enrolled, 36.6 percent received abciximab as a "bail-out". The overall in-hospital ischaemic event rates were low at 4.0 percent. The complication rates included major bleeding 0.7 percent, thrombocytopenia 2.7 percent and need for blood transfusion 2.8 percent. There was a trend towards a higher incidence of in-hospital non-Q myocardial infarction in the "bail-out" group (2.1 percent versus 7.3 percent, p-value equals 0.07). CONCLUSION Abxicimab was uncommonly used among patients (9.4 percent) undergoing PCI in this Asian region, with the operators reserving it mainly for high-risk patients.
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Affiliation(s)
- K K Poh
- Cardiac Department, National University Hospital, 5 Lower Kent Ridge Road, Singapore 119074.
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Omar AR, Ping C, Tan HC, Lim YT. Clinical predictors of a positive troponin T test in patients presenting with probable acute coronary syndromes. Med J Malaysia 2005; 60:50-3. [PMID: 16250280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Acute coronary syndrome (ACS) patients with positive troponin T (TnT) test are at higher risk for death and myocardial reinfarction. They would significantly benefit from early aggressive pharmacologic and invasive therapy. However, TnT test is not widely available. This retrospective study of 173 patients with ACS showed: that prolonged or repetitive episodes of angina at rest in the previous 24 hours (p = 0.01) and evidence of myocardial ischaemia on ECG (p < 0.001) were associated with positive TnT tests (> or = 0.1 ng/mL). The two variables in combination showed 100% positive predictive value, facilitating early identification and streamlining of therapy.
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Affiliation(s)
- A R Omar
- Cardiac Department, National University Hospital, The Heart Institute, National University Hospital, The Heart Institute, 5 Lower Kent Ridge, Road Level 3, Main Building, Singapore 119074
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Lee CH, Wong HB, Tan HC, Jun JZ, Teo SG, Ong HY, Low A, Sutandar A, Lim YT. Impact of reversibility of no-reflow phenomenon on 30-day mortality following percutaneous revascularisation for acute myocardial infarction--insights from a 1328-patient registry. Ann Acad Med Singap 2004; 33:S79-81. [PMID: 15651223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Affiliation(s)
- C H Lee
- Cardiac Department, National University Hospital, The Heart Institute, Singapore.
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Law PK, Haider K, Fang G, Jiang S, Chua F, Lim YT, Sim E. Human VEGF165-myoblasts produce concomitant angiogenesis/myogenesis in the regenerative heart. Mol Cell Biochem 2004; 263:173-8. [PMID: 15524178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Bioengineering the regenerative heart may provide a novel treatment for heart failure. On May 14, 2002, a 55-year-old man suffering from ischemic myocardial infarction received 25 injections carrying 465 million cGMP-produced pure myoblasts into his myocardium after coronary artery bypass grafting. As on August 28, 2002, his EKG was normal and showed no arrhythmia. His ejection fraction increased by 13%. He no longer experienced shortness of breath and angina as he did before the treatment. Three myogenesis mechanisms were elucidated with 17 human/porcine xenografts using cyclosporine as immunosuppressant. Some myoblasts developed to become cardiomyocytes. Others transferred their nuclei into host cardiomyocytes through natural cell fusion. As yet others formed skeletal myofibers with satellite cells. De novo production of contractile filaments augmented the heart contractility. Human myoblasts transduced with VEGF165 gene produced six times more capillaries in porcine myocardium than in placebo. Xenograft rejection was not observed for up to 20 weeks despite cyclosporine discontinuation at 6 weeks. Pros and cons of autografts vs. allografts are compared to guide future development of heart cell therapy.
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Affiliation(s)
- Peter K Law
- Cell Therapy Research Foundation, Memphis, TN, USA.
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Low AF, Seow SC, Yeoh KG, Lim YT, Tan HC, Yeo TC. High-sensitivity C-reactive protein is predictive of medium-term cardiac outcome in high-risk Asian patients presenting with chest pain syndrome without myocardial infarction. Ann Acad Med Singap 2004; 33:407-12. [PMID: 15329749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
INTRODUCTION High-sensitivity C-reactive protein (hs-CRP) has been shown to be predictive of cardiac events but data among Asians is comparatively few. We evaluated the role of hs-CRP in the prediction of adverse cardiac outcome in a cohort of high-risk patients presenting with chest pain syndrome without myocardial infarction (MI). MATERIALS AND METHODS Three hundred and forty-seven patients were prospectively recruited over an 18-month period and patients with MI as documented by serial electrocardiogram abnormalities, and creatinine kinase or troponin elevation were excluded. Mean follow-up duration was 901 +/- 306 days. Kaplan-Meier and Cox proportional hazards modelling were used to evaluate outcome and determine association with predictor variables. RESULTS The composite primary endpoint of cardiac mortality, non-fatal MI, cardiac failure or coronary revascularisation procedure (coronary artery bypass grafting or angioplasty) unrelated to the index admission was reached in 37 patients. History of previous MI (P = 0.002), presence of at least 1 coronary artery with > or =50% stenosis (P = 0.028) and elevated hs-CRP levels were associated with an adverse cardiac outcome (P = 0.001 for CRP in the upper quartile, and 0.002 for CRP > or = 1mg/L, respectively). None of the traditional cardiovascular risk factors (hypertension, diabetes mellitus, dyslipidaemia, significant family history, smoking, male gender and increased age) was predictive. Multivariate modelling showed elevated hs-CRP to confer the highest risk for an adverse cardiac outcome (P <0.001). CONCLUSION Hs-CRP is useful in further stratifying high-risk multi-ethnic patients presenting with chest pain despite no evidence of MI. Close follow-up and aggressive management of these patients may be warranted.
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Affiliation(s)
- A F Low
- The Heart Institute, National University Hospital, 5 Lower Kent Ridge Road, Singapore 119074
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Low AF, Ng WL, Lim YT, Yeo TC. The impact of diabetes mellitus on the prognostic value of a normal dobutamine stress echocardiogram in patients with intermediate to high cardiovascular risk. Singapore Med J 2004; 45:161-5. [PMID: 15094984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
INTRODUCTION There is currently limited data on the prognostic value of a normal dobutamine stress echocardiogram (DSE) in patients with intermediate to high cardiovascular risk. The impact of diabetes mellitus, recently recognised as a cardiovascular risk-equivalent, has not been previously evaluated. This study aims to determine the prognostic value of a normal DSE in these patients. METHODS The study population includes all patients with two cardiovascular risk factors or diabetes mellitus and a normal DSE (baseline and peak stress) with three months follow-up. A total of 122 patients (47 females, 75 males; mean age 59.6 years) were recruited. Impact of diabetes mellitus on subsequent cardiovascular events was determined. RESULTS Diabetes mellitus was present in 32.8 percent, hypertension in 72.1 percent, smoking in 27.0 percent, family history of premature coronary artery disease in 15.6 percent, and hypercholesterolemia in 66.4 percent. On follow-up until 6.4 years (mean 4.1 years), there were four myocardial infarctions (0.8 percent per patient/year) and five revascularisation procedures (1.0 percent per patient/year). The majority of adverse events occurred among patients with diabetes mellitus (three out of four myocardial infarctions; four out of five revascularisations). Diabetes mellitus independently predicted subsequent cardiac events on both univariate and multivariate analyses (p value is equal to 0.015 and 0.011, respectively). Presence of diabetes mellitus also conferred a worse outcome on survival analysis (p value is equivalent to 0.0046). CONCLUSION The presence of diabetes mellitus adversely affects clinical outcome despite a normal DSE. Patients without diabetes mellitus, but with intermediate to high cardiovascular risk, and a normal DSE have a better medium term outcome.
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Affiliation(s)
- A F Low
- Cardiac Department, National University of Singapore, National University Hospital, Singapore.
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Abstract
Prior electromyographic (EMG) analyses of the tennis serve have focused on the muscles in the hitting arm and shoulder region. This preliminary study aimed to examine the muscle activation patterns of selected lower trunk muscles during three different types of tennis serve--flat, topspin, and slice. Five male highly skilled tennis players completed 10 trials for each type of serve. Surface EMG electrodes were used to monitor the rectus abdominis (RA), external oblique (EO), internal oblique (IO), and lumbar erector spinae (ES) muscles. For each subject, the two trials with the highest self-reported ratings were analysed. Average EMG levels during each phase of a tennis serve for each muscle were analysed using a non-parametric ANOVA design. No major differences in muscle activation pattern were found across different serve types, and bilateral differences in muscle activation were more pronounced in RA and EO than in IO and ES muscles. The abdominal muscles were more active in the topspin than in the other two types of serves during the upward swing of the racket. An appreciable amount of abdominal/low back and bilateral co-activation was observed during certain phases of the serve. The co-activation of lower trunk muscles may help to stabilise the lumbar spine during the arch back and forward swing phases of the serve. The results reinforce the importance of abdominal and low back exercises in the strength and rehabilitation programs designed for tennis players.
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Affiliation(s)
- J W Chow
- Department of Exercise and Sport Sciences, University of Florida, Gainesville, Florida, USA
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Tan HC, Low A, Ng KS, Budiono B, Sutandar A, Chia BL, Lim YT. Fatal pulmonary haemorrhage with the combined use of abciximab and fibrinolytic agent. Singapore Med J 2002; 43:587-9. [PMID: 12680530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
The increased bleeding risk associated with the use of abciximab has been well reported. The risk appears to be amplified when abciximab is administered concurrently with a fibrinolytic agent. We report and review the literature on the occurrence of a case of fatal pulmonary haemorrhage, a rare bleeding complication, in a patient who received both these drugs.
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Affiliation(s)
- H C Tan
- Cardiac Department, National University Hospital, 5 Lower Kent, Ridge Road, Singapore 119074.
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Poh KK, Tan HC, Chia BL, Lim YT. A case of broken heart from blunt trauma. Singapore Med J 2002; 43:423-5. [PMID: 12507030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
A young man with blunt chest trauma presented acutely in shock as a result of cardiac rupture causing acute bloody tamponade. We discuss the clinical presentation, the importance of rapid and accurate diagnosis and management of such cases.
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Affiliation(s)
- K K Poh
- Cardiac Department, National University Hospital, 5 Lower Kent Ridge Road, Singapore 119074.
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Chang CL, Park TH, Lee EY, Lim YT, Son HC. Recurrent self-limited fungemia caused by Yarrowia lipolytica in a patient with acute myelogenous leukemia. J Clin Microbiol 2001; 39:1200-1. [PMID: 11230460 PMCID: PMC87906 DOI: 10.1128/jcm.39.3.1200-1201.2001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Yarrowia lipolytica is a weakly pathogenic yeast that is rarely isolated from the blood. We observed transient recurrent catheter-related fungemia attributable to this organism in a leukemic patient. The fungemia and accompanying fever subsided spontaneously. The data suggest that it might be possible to withhold specific treatment for Y. lipolytica fungemia even in an immunocompromised patient.
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Affiliation(s)
- C L Chang
- Departments of Clinical Pathology, College of Medicine, Pusan National University, #10 1 -Ga Ami-Dong Seo-Gu, Pusan 602-739, Korea.
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Lee YM, Seol YJ, Lim YT, Kim S, Han SB, Rhyu IC, Baek SH, Heo SJ, Choi JY, Klokkevold PR, Chung CP. Tissue-engineered growth of bone by marrow cell transplantation using porous calcium metaphosphate matrices. J Biomed Mater Res 2001; 54:216-23. [PMID: 11093181 DOI: 10.1002/1097-4636(200102)54:2<216::aid-jbm8>3.0.co;2-c] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In this study we investigated not only osteoblastic cell proliferation and differentiation on the surface of calcium metaphosphate (CMP) matrices in vitro but also bone formation by ectopic implantation of these cell-matrix constructs in athymic mice in vivo. Interconnected porous CMP matrices with pores 200 microm in size were prepared to use as scaffolds for rat-marrow stromal-cell attachment. Cell-matrix constructs were cultured in vitro, and cell proliferation and ALPase activities were monitored for 56 days. In addition to their being cultured in vitro, cell-matrix constructs were implanted into subcutaneous sites of athymic mice. In vitro these porous CMP matrices supported the proliferation of osteoblastic cells as well as their differentiation, as indicated by high ALPase activity. In vivo the transplanted marrow cells gave rise to bone tissues in the pores of the CMP matrices. A small amount of woven bone formation was detected first at 4 weeks; osteogenesis progressed vigorously with time, and thick lamellar bones that had been remodeled were observed at 12 weeks. These findings demonstrate the potential for using a porous CMP matrix as a biodegradable scaffold ex vivo along with attached marrow-derived mesenchymal cells for transplantation into a site for bone regeneration in vivo.
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Affiliation(s)
- Y M Lee
- Department of Periodontology, College of Dentistry, Seoul National University, 28-2 Yongon-Dong, Chongno-Ku, Seoul 110-749, Korea
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Chung KW, Kim MR, Yoo SW, Kwon DJ, Lim YT, Kim JH, Lee JW. Can bone turnover markers correlate bone mass at the hip and spine according to menopausal period? Arch Gynecol Obstet 2000; 264:119-23. [PMID: 11129509 DOI: 10.1007/s004040000093] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Changes in bone turnover with years since menopause (YSM) are responsible for bone loss and play a major role in osteoporosis. Although single measurements of the bone turnover marker appear unlikely to be clinically useful in predicting bone mineral density, the usefulness of these measurements in relation to the YSM has not been well established. The establishment of this relationship was the aim of this study. To address this issue, we have measured a battery of sensitive and specific markers of bone turnover in 272 women postmenopausal from -5 to 15 a, and the data was correlated with bone mineral density (BMD) at different skeletal sites measured utilizing dual-energy X-ray absorptiometry (DXA). Bone formation was assessed by serum osteocalcin (OC), and bone resorption by Pyr and D-pyr. The three markers and BMD were compared between the groups (YSM). Among the three markers, only Pyr exhibited a significant difference between pre and postmenopausal groups. In the aspect of correlation between bone turnover marker and BMD according to the groups (YSM), we found negative strong correlations between the BMD of lumbar spine (L2-4) vs. Pyr (P=0.01, r=-0.75) in the premenopausal group (-5 approximately 0 YSM), and we found negative correlation between the BMD of L2-4 vs. osteocalcin (P=0.05, r=-0.2 and P=0.01, r=-4).44) in the postmenopause groups (0 approximately 5 and 5 approximately 10 YSM). We concluded that Pyr in women -5 approximately 0 YSM and osteocalcin in women 0 approximately 10 YSM displayed negative correlation with BMD of L2-4.
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Affiliation(s)
- K W Chung
- Department of Obstetrics and Gynecology, College of Medicine, The Catholic University of Korea, KangNam St Mary's Hospital, Seoul.
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Chia BL, Yip JW, Tan HC, Lim YT. Usefulness of ST elevation II/III ratio and ST deviation in lead I for identifying the culprit artery in inferior wall acute myocardial infarction. Am J Cardiol 2000; 86:341-3. [PMID: 10922448 DOI: 10.1016/s0002-9149(00)00929-2] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
In a study of 92 patients presenting with inferior wall acute myocardial infarction, the infarct-related artery was the right coronary artery in 72 patients (78%) and the left circumflex artery in 20 (22%). An ST II/III ratio of 1 or an isoelectric ST in lead I are sensitive and specific markers of left circumflex artery occlusion, whereas an ST II/III ratio <1 (ST elevation in lead III >II) or ST depression in lead I are sensitive and specific markers of right coronary artery occlusion.
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Affiliation(s)
- B L Chia
- Cardiac Department, National University Hospital, Singapore
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Ooi SB, Lim YT, Lau TC, Chia BL, Pillai S, Liu T. Value of troponin-T rapid assay, cardiac enzymes, electrocardiogram and history of chest pain in the initial diagnosis of myocardial infarction in the emergency department. Eur J Emerg Med 2000; 7:91-8. [PMID: 11132084 DOI: 10.1097/00063110-200006000-00002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We conducted a prospective study of 152 adult patients presenting to an emergency department with chest pain or symptoms suggestive of acute myocardial infarction (AMI) to evaluate the first electrocardiogram (ECG), creatine kinase (CK)-MB and Troponin-T Rapid Assay (TnT) alone or in combination with chest pain in the initial diagnosis of AMI. A provisional diagnosis was made after the history, physical examination and the first ECG reading. Blood specimens were taken for TnT, CK and CK-MB mass. A final discharge diagnosis of AMI was made according to World Health Organization criteria. Seventy-six (50%) of patients had a final diagnosis of AMI. The sensitivities of the first ECG, first CK-MB mass and first TnT were 76.3% (95% confidence interval (CI), 66.8-85.9), 38.2% (95% CI, 27.2-49.1) and 31.6% (95% CI, 21.2-42.0) respectively. The area under the curve for a combination of ECG, CK-MB mass, TnT and chest pain was the highest at 0.937 when compared with chest pain with varying combinations of tests. A combination of the first ECG, CK-MB mass and TnT had a negative predictive value (NPV) of 87.9% (95% CI, 80.0-95.8). The first ECG was the most sensitive test while the combination of chest pain, ECG, cardiac enzymes and TnT gave the best results in the initial diagnosis of AMI. If the first ECG, CK-MB mass and TnT are all negative, the probability of having an AMI is 12%.
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Affiliation(s)
- S B Ooi
- Emergency Medicine Department, National University Hospital, Singapore
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Abstract
A reduction in glomerular filtration rate (GFR) is a primary characteristic of ischemic acute renal failure. The present study was undertaken to examine the roles of angiotensin II, tubuloglomerular-feedback (TGF) mechanism, and tubular obstruction for the GFR reduction in the post-ischemic kidney. Renal ischemia was induced by occlusion of the bilateral renal arteries for 60 min, and renal function was examined at 2 and 24 h after the onset of reflow. After the end of 2-h reflow, the GFR was not significantly changed, but the urine flow increased significantly. On the other hand, at the end of 24-h reflow, the GFR and urine flow decreased markedly along with increased filtration fraction. The renal blood flow significantly decreased at 24 h, but not 2 h, after reflow, which was accompanied by increased total renal vascular resistance. Furosemide infusion (1 mg/min/kg) after 24 h of reflow prevented the reduction in GFR and filtration fraction without no changes in renal blood flow and total renal vascular resistance. Pretreatment of enalapril and losartan did not prevent the reduction in GFR, indicating that angiotensin II was not involved. In morphological examinations, tubular obstruction was seen in the proximal and distal tubules of kidneys both at 2 and 24 h after the onset of reflow. In two rabbits subjected to 48 h of reflow, the tubular obstruction was not observed, despite GFR remained depressed. These results suggest that the late reduction in GFR in postischemic kidneys is not mediated by angiotensin II, but is mediated, at least in part, by the TGF mechanism. The tubular obstruction may be not prerequisite for the GFR reduction in rabbits.
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Affiliation(s)
- S J Kim
- Department of Pediatrics, College of Medicine, Pusan, National University, Korea
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