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Hirschberg Y, Schildermans K, van Dam A, Sterck K, Boonen K, Nelissen I, Vermeiren Y, Mertens I. Characterizing extracellular vesicles from cerebrospinal fluid by a novel size exclusion chromatography method. Alzheimers Dement 2021. [DOI: 10.1002/alz.051264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Gallant J, Heunis T, Beltran C, Schildermans K, Bruijns S, Mertens I, Bitter W, Sampson SL. PPE38-Secretion-Dependent Proteins of M. tuberculosis Alter NF-kB Signalling and Inflammatory Responses in Macrophages. Front Immunol 2021; 12:702359. [PMID: 34276695 PMCID: PMC8284050 DOI: 10.3389/fimmu.2021.702359] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 06/07/2021] [Indexed: 11/17/2022] Open
Abstract
It was previously shown that secretion of PE-PGRS and PPE-MPTR proteins is abolished in clinical M. tuberculosis isolates with a deletion in the ppe38-71 operon, which is associated with increased virulence. Here we investigate the proteins dependent on PPE38 for their secretion and their role in the innate immune response using temporal proteomics and protein turnover analysis in a macrophage infection model. A decreased pro-inflammatory response was observed in macrophages infected with PPE38-deficient M. tuberculosis CDC1551 as compared to wild type bacteria. We could show that dampening of the pro-inflammatory response is associated with activation of a RelB/p50 pathway, while the canonical inflammatory pathway is active during infection with wild type M. tuberculosis CDC1551. These results indicate a molecular mechanism by which M. tuberculosis PE/PPE proteins controlled by PPE38 have an effect on modulating macrophage responses through NF-kB signalling.
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Affiliation(s)
- James Gallant
- Department of Science and Technology/National Research Foundation Centre of Excellence in Biomedical Tuberculosis Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
- Section Molecular Microbiology, Amsterdam Institute for Molecules, Medicines and Systems, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Tiaan Heunis
- Department of Science and Technology/National Research Foundation Centre of Excellence in Biomedical Tuberculosis Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Caroline Beltran
- Department of Science and Technology/National Research Foundation Centre of Excellence in Biomedical Tuberculosis Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | | | - Sven Bruijns
- Department of Molecular Cell Biology and Immunology, Cancer Center Amsterdam, Amsterdam Infection and Immunity Institute, Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, Netherlands
| | | | - Wilbert Bitter
- Section Molecular Microbiology, Amsterdam Institute for Molecules, Medicines and Systems, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
- Medical Microbiology and Infection Control, Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, Netherlands
| | - Samantha L. Sampson
- Department of Science and Technology/National Research Foundation Centre of Excellence in Biomedical Tuberculosis Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
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Budamgunta H, Maes E, Willems H, Menschaert G, Schildermans K, Kumar AA, Boonen K, Baggerman G. Multiple solvent elution, a method to counter the effects of coelution and ion suppression in LC-MS analysis in bottom up proteomics. J Chromatogr B Analyt Technol Biomed Life Sci 2019; 1124:256-264. [PMID: 31238262 DOI: 10.1016/j.jchromb.2019.06.017] [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: 03/01/2019] [Revised: 06/10/2019] [Accepted: 06/13/2019] [Indexed: 10/26/2022]
Abstract
On average a human cell type expresses around 10,000 different protein coding genes synthesizing all the different molecular forms of the protein product (proteoforms) found in a cell. In a typical shotgun bottom up proteomic approach, the proteins are enzymatically cleaved, producing several 100,000 s of different peptides that are analyzed with liquid chromatography-tandem mass spectrometry (LC-MSMS). One of the major consequences of this high sample complexity is that coelution of peptides cannot be avoided. Moreover, low abundant peptides are difficult to identify as they have a lower chance of being selected for fragmentation due to ion-suppression effects and the semi-stochastic nature of the precursor selection in data-dependent shotgun proteomic analysis where peptides are selected for fragmentation analysis one-by-one as they elute from the column. In the current study we explore a simple novel approach that has the potential to counter some of the effect of coelution of peptides and improves the number of peptide identifications in a bottom-up proteomic analysis. In this method, peptides from a HeLa cell digest were eluted from the reverse phase column using three different elution solvents (acetonitrile, methanol and acetone) in three replicate reversed phase LC-MS/MS shotgun proteomic analysis. Results were compared with three technical replicates using the same solvent, which is common practice in proteomic analysis. In total, we see an increase of up to 10% in unique protein and up to 30% in unique peptide identifications from the combined analysis using different elution solvents when compared to the combined identifications from the three replicates of the same solvent. In addition, the overlap of unique peptide identifications common in all three LC-MS analyses in our approach is only 23% compared to 50% in the replicates using the same solvent. The method presented here thus provides an easy to implement method to significantly reduce the effects of coelution and ion suppression of peptides and improve protein coverage in shotgun proteomics. Data are available via ProteomeXchange with identifier PXD011908.
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Affiliation(s)
| | - Evelyne Maes
- Food & Bio-Based Products, AgResearch Ltd., 1365 Springs Road, Lincoln 7674, New Zealand
| | - Hanny Willems
- Unit Environmental Risk & Health, VITO, Mol, Belgium
| | - Gerben Menschaert
- BioBix Lab, Department of Mathematical Modelling, Statistics and Bio-informatics, Ghent University, Ghent, Belgium
| | | | | | - Kurt Boonen
- Centre for Proteomics, UAntwerp, Antwerp, Belgium; Unit Environmental Risk & Health, VITO, Mol, Belgium
| | - Geert Baggerman
- Centre for Proteomics, UAntwerp, Antwerp, Belgium; Unit Environmental Risk & Health, VITO, Mol, Belgium.
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Ahmed M, Broeckx G, Baggerman G, Schildermans K, Pauwels P, Van Craenenbroeck AH, Dendooven A. Next-generation protein analysis in the pathology department. J Clin Pathol 2019; 73:1-6. [DOI: 10.1136/jclinpath-2019-205864] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 06/12/2019] [Accepted: 06/20/2019] [Indexed: 02/06/2023]
Abstract
Traditionally, immunohistochemistry (IHC) is used by pathologists to localise specific proteins or peptides in tissue slides. In the era of personalised medicine, however, molecular tissue analysis becomes indispensable for correct diagnosis, prognosis and therapeutic decision, not only on the DNA or mRNA level but also on the protein level. Combining molecular information with imaging presents many advantages. Therefore, matrix-assisted laser desorption/ionisation imaging mass spectrometry (MALDI IMS) is a promising technique to be added to the armamentarium of the pathologist. Here, we focus on the workflow, advantages and drawbacks of both MALDI IMS and IHC. We also briefly discuss a few other protein imaging modalities and give examples of applications.
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Berghmans E, Van Raemdonck G, Schildermans K, Willems H, Boonen K, Maes E, Mertens I, Pauwels P, Baggerman G. MALDI Mass Spectrometry Imaging Linked with Top-Down Proteomics as a Tool to Study the Non-Small-Cell Lung Cancer Tumor Microenvironment. Methods Protoc 2019; 2:mps2020044. [PMID: 31164623 PMCID: PMC6632162 DOI: 10.3390/mps2020044] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 03/29/2019] [Revised: 05/10/2019] [Accepted: 05/22/2019] [Indexed: 02/06/2023] Open
Abstract
Advanced non-small-cell lung cancer (NSCLC) is generally linked with a poor prognosis and is one of the leading causes of cancer-related deaths worldwide. Since only a minority of the patients respond well to chemotherapy and/or targeted therapies, immunotherapy might be a valid alternative in the lung cancer treatment field, as immunotherapy attempts to strengthen the body’s own immune response to recognize and eliminate malignant tumor cells. However, positive response patterns to immunotherapy remain unclear. In this study, we demonstrate how immune-related factors could be visualized from single NSCLC tissue sections (Biobank@UZA) while retaining their spatial information by using matrix assisted laser desorption/ionization (MALDI) mass spectrometry imaging (MSI), in order to unravel the molecular profile of NSCLC patients. In this way, different regions in lung cancerous tissues could be discriminated based on the molecular composition. In addition, we linked visualization (MALDI MSI) and identification (based on liquid chromatography higher resolution mass spectrometry) of the molecules of interest for the correct biological interpretation of the observed molecular differences within the area in which these molecules are detected. This is of major importance to fully understand the underlying molecular profile of the NSCLC tumor microenvironment.
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Affiliation(s)
- Eline Berghmans
- Centre for Proteomics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium.
- Health Unit, VITO, Boeretang 200, 2400 Mol, Belgium.
| | - Geert Van Raemdonck
- Centre for Proteomics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium.
| | - Karin Schildermans
- Centre for Proteomics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium.
- Health Unit, VITO, Boeretang 200, 2400 Mol, Belgium.
| | - Hanny Willems
- Centre for Proteomics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium.
- Health Unit, VITO, Boeretang 200, 2400 Mol, Belgium.
| | - Kurt Boonen
- Centre for Proteomics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium.
- Health Unit, VITO, Boeretang 200, 2400 Mol, Belgium.
| | - Evelyne Maes
- Food & Bio-Based Products, AgResearch Ltd., 8140 Christchurch, New Zealand.
| | - Inge Mertens
- Centre for Proteomics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium.
- Health Unit, VITO, Boeretang 200, 2400 Mol, Belgium.
| | - Patrick Pauwels
- Department of Pathology, Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium.
| | - Geert Baggerman
- Centre for Proteomics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium.
- Health Unit, VITO, Boeretang 200, 2400 Mol, Belgium.
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Maes E, Oeyen E, Boonen K, Schildermans K, Mertens I, Pauwels P, Valkenborg D, Baggerman G. The challenges of peptidomics in complementing proteomics in a clinical context. Mass Spectrom Rev 2019; 38:253-264. [PMID: 30372792 DOI: 10.1002/mas.21581] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 10/01/2018] [Indexed: 06/08/2023]
Abstract
Naturally occurring peptides, including growth factors, hormones, and neurotransmitters, represent an important class of biomolecules and have crucial roles in human physiology. The study of these peptides in clinical samples is therefore as relevant as ever. Compared to more routine proteomics applications in clinical research, peptidomics research questions are more challenging and have special requirements with regard to sample handling, experimental design, and bioinformatics. In this review, we describe the issues that confront peptidomics in a clinical context. After these hurdles are (partially) overcome, peptidomics will be ready for a successful translation into medical practice.
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Affiliation(s)
- Evelyne Maes
- Flemish Institute for Technological Research (VITO), Mol, Belgium
- Centre for Proteomics, University of Antwerp, Antwerp, Belgium
- Food and Bio-Based Products, AgResearch Ltd., Lincoln, New Zealand
| | - Eline Oeyen
- Flemish Institute for Technological Research (VITO), Mol, Belgium
- Centre for Proteomics, University of Antwerp, Antwerp, Belgium
| | - Kurt Boonen
- Flemish Institute for Technological Research (VITO), Mol, Belgium
- Centre for Proteomics, University of Antwerp, Antwerp, Belgium
| | - Karin Schildermans
- Flemish Institute for Technological Research (VITO), Mol, Belgium
- Centre for Proteomics, University of Antwerp, Antwerp, Belgium
| | - Inge Mertens
- Flemish Institute for Technological Research (VITO), Mol, Belgium
- Centre for Proteomics, University of Antwerp, Antwerp, Belgium
| | - Patrick Pauwels
- Molecular Pathology Unit, Department of Pathology, Antwerp University Hospital, Edegem, Belgium
| | - Dirk Valkenborg
- Flemish Institute for Technological Research (VITO), Mol, Belgium
- Centre for Proteomics, University of Antwerp, Antwerp, Belgium
- Center for Statistics, Hasselt University, Diepenbeek, Belgium
| | - Geert Baggerman
- Flemish Institute for Technological Research (VITO), Mol, Belgium
- Centre for Proteomics, University of Antwerp, Antwerp, Belgium
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Van Looveren J, Van Gerwen V, Schildermans K, Laukens K, Baggerman G, Tassignon MJ. Proteomic analysis of posterior capsular plaques in congenital unilateral cataract. Acta Ophthalmol 2018; 96:e963-e969. [PMID: 30280517 DOI: 10.1111/aos.13782] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 03/12/2018] [Indexed: 12/31/2022]
Abstract
PURPOSE To obtain insights on the protein composition of posterior capsular plaques (PCP) in congenital unilateral cataract with anterior vitreolenticular interface dysgenesis (AVLID). METHODS Posterior capsular plaque's were collected during surgery in children presenting with congenital unilateral cataract. Surgeries were analysed focusing on the type of cataract, the integrity of the posterior capsule after peeling the PCP and the presence of vitreolenticular adherences when performing primary posterior capsulorhexis. Proteome analysis was performed on the collected PCPs. RESULTS Posterior capsular plaques collection and proteome analysis were feasible from four children presenting with unilateral idiopathic congenital cataract and AVLID. A large portion of the proteins found in the PCPs was similar to the proteins known to be present in lens epithelial cells and fibres. Proteins like vimentin, fibronectin, collagen type I, collagen type VI and lumican were also found, which typically are present in mesenchymal tissue but not in lens tissue or capsule. CONCLUSION Posterior capsular plaques in cases of unilateral idiopathic congenital cataract of the AVLID type present a protein composition of mainly proteins found in lens epithelial cells and fibres. Some proteins however are a specific for lens tissue and are typically seen in mesenchymal tissue.
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Affiliation(s)
- Jan Van Looveren
- Department of Ophthalmology; Antwerp University Hospital; Edegem Belgium
- Faculty of Medicine and Health Sciences; University of Antwerp; Antwerp Belgium
| | - Veerle Van Gerwen
- Faculty of Medicine and Health Sciences; University of Antwerp; Antwerp Belgium
| | | | - Kris Laukens
- Department of Mathematics and Computer Science; University of Antwerp; Antwerp Belgium
| | - Geert Baggerman
- Centre for Proteomics; University of Antwerp; Wilrijk Belgium
| | - Marie-José Tassignon
- Department of Ophthalmology; Antwerp University Hospital; Edegem Belgium
- Faculty of Medicine and Health Sciences; University of Antwerp; Antwerp Belgium
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8
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Oeyen E, Van Mol K, Baggerman G, Willems H, Boonen K, Rolfo C, Pauwels P, Jacobs A, Schildermans K, Cho WC, Mertens I. Ultrafiltration and size exclusion chromatography combined with asymmetrical-flow field-flow fractionation for the isolation and characterisation of extracellular vesicles from urine. J Extracell Vesicles 2018; 7:1490143. [PMID: 29988836 PMCID: PMC6032024 DOI: 10.1080/20013078.2018.1490143] [Citation(s) in RCA: 87] [Impact Index Per Article: 14.5] [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: 10/10/2017] [Accepted: 06/13/2018] [Indexed: 12/20/2022] Open
Abstract
Extracellular vesicles (EVs) have a great potential in clinical applications. However, their isolation from different bodily fluids and their characterisation are currently not optimal or standardised. Here, we report the results of examining the performance of ultrafiltration combined with size exclusion chromatography (UF-SEC) to isolate EVs from urine. The results reveal that UF-SEC is an efficient method and provides high purity. Furthermore, we introduce asymmetrical-flow field-flow fractionation coupled with a UV detector and multi-angle light-scattering detector (AF4/UV-MALS) as a characterisation method and compare it with current methods. We demonstrate that AF4/UV-MALS is a straightforward and reproducible method for determining size, amount and purity of isolated urinary EVs.
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Affiliation(s)
- Eline Oeyen
- Sustainable Health Department, Flemish Institute for Technological Research (VITO), Mol, Belgium.,Centre for Proteomics (CFP), University of Antwerp, Antwerp, Belgium
| | | | - Geert Baggerman
- Sustainable Health Department, Flemish Institute for Technological Research (VITO), Mol, Belgium.,Centre for Proteomics (CFP), University of Antwerp, Antwerp, Belgium
| | - Hanny Willems
- Sustainable Health Department, Flemish Institute for Technological Research (VITO), Mol, Belgium.,Centre for Proteomics (CFP), University of Antwerp, Antwerp, Belgium
| | - Kurt Boonen
- Sustainable Health Department, Flemish Institute for Technological Research (VITO), Mol, Belgium.,Centre for Proteomics (CFP), University of Antwerp, Antwerp, Belgium
| | - Christian Rolfo
- Phase I - Early Clinical Trials Unit, Oncology Department, Antwerp University Hospital (UZA) & Edegem & Center for Oncological Research, University of Antwerp, Antwerp, Belgium
| | - Patrick Pauwels
- Pathological Anatomy Department, Antwerp University Hospital (UZA), Edegem, Belgium
| | - An Jacobs
- Sustainable Health Department, Flemish Institute for Technological Research (VITO), Mol, Belgium
| | | | - William C Cho
- Department of Clinical Oncology, Queen Elizabeth Hospital, Kowloon, Hong Kong
| | - Inge Mertens
- Sustainable Health Department, Flemish Institute for Technological Research (VITO), Mol, Belgium.,Centre for Proteomics (CFP), University of Antwerp, Antwerp, Belgium
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Budamgunta H, Olexiouk V, Luyten W, Schildermans K, Maes E, Boonen K, Menschaert G, Baggerman G. Comprehensive Peptide Analysis of Mouse Brain Striatum Identifies Novel sORF-Encoded Polypeptides. Proteomics 2018; 18:e1700218. [DOI: 10.1002/pmic.201700218] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 03/30/2018] [Indexed: 11/10/2022]
Affiliation(s)
| | - Volodimir Olexiouk
- BioBix; Lab for Bioinformatics and Computational Genomics; Department of Mathematical Modelling; Statistics and Bio-informatics; Ghent University; Ghent Belgium
| | - Walter Luyten
- Animal Physiology and Neurobiology; KULeuven; Leuven Belgium
| | | | - Evelyne Maes
- Centre for Proteomics; UAntwerp; Antwerp Belgium
- Proteins and Biomaterials; AgResearch; Christchurch New Zealand
| | - Kurt Boonen
- Centre for Proteomics; UAntwerp; Antwerp Belgium
- Unit Environmental Risk and Health; VITO; Mol Belgium
| | - Gerben Menschaert
- BioBix; Lab for Bioinformatics and Computational Genomics; Department of Mathematical Modelling; Statistics and Bio-informatics; Ghent University; Ghent Belgium
| | - Geert Baggerman
- Centre for Proteomics; UAntwerp; Antwerp Belgium
- Unit Environmental Risk and Health; VITO; Mol Belgium
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10
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Van Looveren J, Van Gerwen V, Schildermans K, Laukens K, Baggerman G, Tassignon M. Protein analysis of the plaques in congenital cataracts. Acta Ophthalmol 2017. [DOI: 10.1111/j.1755-3768.2017.03164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - V. Van Gerwen
- University Hospital Antwerp, Ophthalmology; Edegem Belgium
| | - K. Schildermans
- University of Antwerp, Centre for Proteomics; Wilrijk Belgium
| | - K. Laukens
- University of Antwerp, Centre for Proteomics; Wilrijk Belgium
| | - G. Baggerman
- University of Antwerp, Centre for Proteomics; Wilrijk Belgium
| | - M.J. Tassignon
- University Hospital Antwerp, Ophthalmology; Edegem Belgium
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11
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Rogé S, Van Reet N, Odiwuor S, Tran T, Schildermans K, Vandamme S, Vandenberghe I, Vervecken W, Gillingwater K, Claes F, Devreese B, Guisez Y, Büscher P. Recombinant expression of trypanosome surface glycoproteins in Pichia pastoris for the diagnosis of Trypanosoma evansi infection. Vet Parasitol 2013; 197:571-9. [PMID: 23747105 DOI: 10.1016/j.vetpar.2013.05.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2012] [Revised: 02/26/2013] [Accepted: 05/09/2013] [Indexed: 11/18/2022]
Abstract
Serodiagnosis of surra, which causes vast economic losses in livestock, is still based on native antigens purified from bloodstream form Trypanosoma (T.) evansi grown in rodents. To avoid the use of laboratory rodents in antigen preparation we expressed fragments of the invariant surface glycoprotein (ISG) 75, cloned from T. brucei gambiense cDNA, and the variant surface glycoprotein (VSG) RoTat 1.2, cloned from T. evansi gDNA, recombinantly in Pichia (P.) pastoris. The M5 strain of this yeast has an engineered N-glycosylation pathway resulting in homogenous Man5GlcNAc2 N-glycosylation which resembles the predominant Man9-5GlcNAc2 oligomannose structures in T. brucei. The secreted recombinant antigens were affinity purified with yields of up to 10mg and 20mg per liter cell culture of rISG 7529-465-E and rRoTat 1.223-385-H respectively. In ELISA, both recombinant proteins discriminated between pre-immune and immune serum samples of 25 goats experimentally infected with T. evansi. The diagnostic potential of rRoTat 1.223-385-H but not of rISG 7529-465-E was confirmed with sera of naturally infected and control dromedary camels. The results suggest that rRoTat 1.223-385-H expressed in P. pastoris requires further evaluation before it could replace native RoTat 1.2 VSG for serodiagnosis of surra, thus eliminating the use of laboratory animals for antigen production.
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Affiliation(s)
- S Rogé
- Department of Biomedical Sciences, Unit of Parasite Diagnostics, Institute of Tropical Medicine, Nationalestraat 155, B-2000 Antwerp, Belgium; Laboratory for Molecular Plant Physiology and Biotechnology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
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Owsianik G, Schildermans K, Waelkens E, Voets T, Nilius B. Lipid and protein interactions at the C‐terminal part of TRPM4. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.1000.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | - Thomas Voets
- Dept. of Molecular Cell Biology, KU LeuvenLeuvenBelgium
| | - Bernd Nilius
- Dept. of Molecular Cell Biology, KU LeuvenLeuvenBelgium
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