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Chatterjee P, Saha S, Mukhopadhyay D. Cell-Based Assay to Detect the Autoantibody Serostatus in Patients with Neuromyelitis Optica Spectrum Disorder (NMOSD). Methods Mol Biol 2024; 2761:121-133. [PMID: 38427234 DOI: 10.1007/978-1-0716-3662-6_10] [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] [Indexed: 03/02/2024]
Abstract
Cell-based assay (CBA) is an immunofluorescence assay that is extensively used for the confirmatory diagnosis of inflammatory demyelinating diseases of the central nervous system, like neuromyelitis optica spectrum disorder (NMOSD). Detecting the type of autoantibody present in the sera of the patients is the primary goal. CBA is the most sensitive and recommended detection method among all similar tools. Briefly, serum autoantibody is screened by transfecting specific cells seeded on cover glasses with full-length specific antigen fused with green fluorescent protein (GFP), followed by treating them with the patient serum used here as the source of primary antibody. The autoantibody-treated cells are further labeled with a rhodamine-conjugated secondary antibody. The co-localization of GFP and rhodamine is visualized by confocal microscopy, and the intensity of fluorescence is evaluated to determine the presence of autoantibody. A detailed protocol to screen antibodies against AQP4 and MOG in human sera using this method is described.
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Affiliation(s)
- Pallavi Chatterjee
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, Kolkata, India
| | - Suparna Saha
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, Kolkata, India
- NINDS, NIH, Bethesda, MD, USA
| | - Debashis Mukhopadhyay
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, Kolkata, India.
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Campàs M, Leonardo S, Rambla-Alegre M, Sagristà N, Vaya R, Diogène J, Torréns M, Fragoso A. Cyclodextrin polymer clean-up method for the detection of ciguatoxins in fish with cell-based assays. Food Chem 2022; 401:134196. [PMID: 36115230 DOI: 10.1016/j.foodchem.2022.134196] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 08/09/2022] [Accepted: 09/08/2022] [Indexed: 12/26/2022]
Abstract
Ciguatoxins (CTXs) are marine toxins produced by microalgae of the genera Gambierdiscus and Fukuyoa, which are transferred through the food webs, reaching humans and causing a poisoning known as ciguatera. The cell-based assay (CBA) is commonly used for their detection because of its high sensitivity and the provided toxicological information. However, matrix effects may interfere in the CBA. In this work, γ-cyclodextrin-hexamethylene diisocyanate (γ-CD-HDI), γ-cyclodextrin-epichlorohydrin (γ-CD-EPI) and γ-CD-EPI conjugated to magnetic beads (γ-CD-EPI-MB) have been evaluated as clean-up materials for fish flesh extracts containing CTXs. The best results were achieved with γ-CD-HDI in column format, which showed a CTX1B recovery of 42% and 32% for Variola louti and Seriola dumerili, respectively, and allowed exposing cells to at least 400 mg/mL of fish flesh. This clean-up strategy provides at least 4.6 and 3.0-fold higher sensitivities to the assay for V.louti and S.dumerili, respectively, improving the reliability of CTX quantification.
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Affiliation(s)
- Mònica Campàs
- Marine and Continental Waters, IRTA, Ctra. Poble Nou km 5.5, 43540 La Ràpita, Spain.
| | - Sandra Leonardo
- Marine and Continental Waters, IRTA, Ctra. Poble Nou km 5.5, 43540 La Ràpita, Spain
| | - Maria Rambla-Alegre
- Marine and Continental Waters, IRTA, Ctra. Poble Nou km 5.5, 43540 La Ràpita, Spain
| | - Núria Sagristà
- Marine and Continental Waters, IRTA, Ctra. Poble Nou km 5.5, 43540 La Ràpita, Spain
| | - Raquel Vaya
- Marine and Continental Waters, IRTA, Ctra. Poble Nou km 5.5, 43540 La Ràpita, Spain
| | - Jorge Diogène
- Marine and Continental Waters, IRTA, Ctra. Poble Nou km 5.5, 43540 La Ràpita, Spain
| | - Mabel Torréns
- Departament d'Enginyeria Química, Universitat Rovira i Virgili, Av. Països Catalans 26, 43007 Tarragona, Spain
| | - Alex Fragoso
- Departament d'Enginyeria Química, Universitat Rovira i Virgili, Av. Països Catalans 26, 43007 Tarragona, Spain
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Campàs M, Leonardo S, Oshiro N, Kuniyoshi K, Tsumuraya T, Hirama M, Diogène J. A smartphone-controlled amperometric immunosensor for the detection of Pacific ciguatoxins in fish. Food Chem 2021; 374:131687. [PMID: 34891085 DOI: 10.1016/j.foodchem.2021.131687] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 08/18/2021] [Revised: 11/23/2021] [Accepted: 11/24/2021] [Indexed: 12/11/2022]
Abstract
Ciguatoxins (CTXs) are marine neurotoxins produced by microalgae of the genera Gambierdiscus and Fukuyoa. CTXs may reach humans through food webs and cause ciguatera fish poisoning (CFP). An immunosensor for the detection of Pacific CTXs in fish was developed using multiwalled carbon nanotube (MWCNT)-modified carbon electrodes and a smartphone-controlled potentiostat. The biosensor attained a limit of detection (LOD) and a limit of quantification (LOQ) of 6 and 27 pg/mL of CTX1B, respectively, which were 0.001 and 0.005 μg/kg in fish flesh. In the analysis of fish samples from Japan and Fiji, excellent correlations were found with sandwich enzyme-linked immunosorbent assays (ELISAs), a cell-based assay (CBA) and liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). Stability of at least 3 months at -20 °C was predicted. In just over 2 h, the biosensor provides reliable, accurate and precise Pacific CTX contents in fish extracts, being suitable for monitoring and research programs.
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Affiliation(s)
- Mònica Campàs
- IRTA, Ctra Poble Nou km 5.5, 43540 Sant Carles de la Ràpita, Spain.
| | - Sandra Leonardo
- IRTA, Ctra Poble Nou km 5.5, 43540 Sant Carles de la Ràpita, Spain
| | - Naomasa Oshiro
- Division of Biomedical Food Research, National Institute of Health Sciences, Kanagawa 210-9501, Japan
| | - Kyoko Kuniyoshi
- Division of Biomedical Food Research, National Institute of Health Sciences, Kanagawa 210-9501, Japan
| | - Takeshi Tsumuraya
- Department of Biological Sciences, Graduate School of Science, Osaka Prefecture University, Osaka 599-8570, Japan
| | - Masahiro Hirama
- Department of Biological Sciences, Graduate School of Science, Osaka Prefecture University, Osaka 599-8570, Japan
| | - Jorge Diogène
- IRTA, Ctra Poble Nou km 5.5, 43540 Sant Carles de la Ràpita, Spain
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Zoltowska Katarzyna M, Belaya K, Leite M, Patrick W, Vincent A, Beeson D. Collagen Q--a potential target for autoantibodies in myasthenia gravis. J Neurol Sci 2014; 348:241-4. [PMID: 25577314 DOI: 10.1016/j.jns.2014.12.015] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 12/08/2014] [Accepted: 12/11/2014] [Indexed: 01/11/2023]
Abstract
Myasthenia gravis (MG) is an autoimmune disorder caused by autoantibodies targeting proteins expressed at the neuromuscular junction (NMJ). In most cases the targets are acetylcholine receptor (AChR), muscle-specific tyrosine kinase (MuSK), or occasionally low-density lipoprotein receptor-related protein 4 (LRP4), but there is still a group of patients, often called seronegative MG (SNMG), with unknown antibody targets. One potential target is collagen Q (COLQ), which is restricted to the NMJ and is crucial for anchoring the NMJ-specific form of acetylcholinesterase (AChE). 415 serum samples with a clinical diagnosis of MG and 43 control samples were screened for the presence of COLQ autoantibodies using a cell-based assay (CBA) with HEK293 cells overexpressing COLQ at the cell surface. COLQ antibodies were detected in 12/415 MG sera and in one/43 control samples. Five of the COLQ-Ab+individuals were also positive for AChR-Abs and 2 for MuSK-Abs. Although the COLQ antibodies were only present at low frequency, and did not differ significantly from the small control cohort, further studies could address whether they modify the clinical presentation or the benefits of anti-cholinesterase therapy.
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Affiliation(s)
- Marta Zoltowska Katarzyna
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Weatherall Institute of Molecular Medicine, Neurosciences Group, OX3 9DS, Oxford, UK
| | - Katsiaryna Belaya
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Weatherall Institute of Molecular Medicine, Neurosciences Group, OX3 9DS, Oxford, UK
| | - Maria Leite
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Weatherall Institute of Molecular Medicine, Neurosciences Group, OX3 9DS, Oxford, UK
| | - Waters Patrick
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Weatherall Institute of Molecular Medicine, Neurosciences Group, OX3 9DS, Oxford, UK
| | - Angela Vincent
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Weatherall Institute of Molecular Medicine, Neurosciences Group, OX3 9DS, Oxford, UK
| | - David Beeson
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Weatherall Institute of Molecular Medicine, Neurosciences Group, OX3 9DS, Oxford, UK.
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Soliño L, Sureda FX, Diogène J. Evaluation of okadaic acid, dinophysistoxin-1 and dinophysistoxin-2 toxicity on Neuro-2a, NG108-15 and MCF-7 cell lines. Toxicol In Vitro 2014; 29:59-62. [PMID: 25238672 DOI: 10.1016/j.tiv.2014.09.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [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: 02/12/2014] [Revised: 05/21/2014] [Accepted: 09/06/2014] [Indexed: 10/24/2022]
Abstract
Marine dinoflagelates from the genus Dynophisis are important producers of Diarrhetic Shellfish Poisoning (DSP) toxins which are responsible for human intoxications. The present work is an approach to study the relative toxicity of DSP toxins effects on Neuro-2a, NG108-15 and MCF-7 cell-lines. Certified standards of okadaic acid (OA), dinophysistoxin-1 (DTX-1) and dinophysistoxin-2 (DTX-2) were used. Our results show that the three toxins exhibit similar cytotoxicity in Neuro-2a and NG108-15 cell lines. Conversely, MCF-7 cells were the least sensitive to these toxins. DTX-1 displayed the most toxic effect in the three tested cell lines.
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Affiliation(s)
- Lucia Soliño
- IRTA, Marine Monitoring Subprogram, Ctra. Poble Nou, Km 5.5, 43540 Sant Carles de la Ràpita, Tarragona, Spain; Universitat Rovira i Virgili, Faculty of Medicine & Health Sciences, Pharmacology Unit, c./ St. Llorenç 21, 43201 Reus, Tarragona, Spain
| | - Francesc X Sureda
- Universitat Rovira i Virgili, Faculty of Medicine & Health Sciences, Pharmacology Unit, c./ St. Llorenç 21, 43201 Reus, Tarragona, Spain
| | - Jorge Diogène
- IRTA, Marine Monitoring Subprogram, Ctra. Poble Nou, Km 5.5, 43540 Sant Carles de la Ràpita, Tarragona, Spain.
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