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Andalucía C, Martínez-Prat L, Bentow C, Aure MA, Horn MP, Mahler M. Clinical Validity of Anti-Proteinase 3 Antibodies in Patients with Inflammatory Bowel Disease: A Short Meta-Analysis. Diagnostics (Basel) 2023; 13:3682. [PMID: 38132266 PMCID: PMC10742424 DOI: 10.3390/diagnostics13243682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/11/2023] [Accepted: 12/14/2023] [Indexed: 12/23/2023] Open
Abstract
Anti-neutrophil cytoplasmic antibodies (ANCA) directed to proteinase 3 (PR3) represent highly established markers for patients with ANCA-associated vasculitis (AAV). PR3-ANCA have also demonstrated utility in the management of inflammatory bowel disease (IBD). More specifically, PR3-ANCA discriminate individuals with ulcerative colitis (UC) from Crohn's disease (CD) patients and are associated with disease severity, activity, and treatment non-response. Here, we aim to summarize the current data on the diagnostic utility of PR3-ANCA in IBD. A structured, systematic literature review, including three electronic databases, was conducted on June 6th, 2023, to identify studies assessing the diagnostic accuracy of the QUANTA Flash® PR3 assay in UC vs. CD patients. Electronic searches were supplemented by hand searching. A hierarchical, bivariate, mixed-effect meta-analysis was conducted using the metandi function, as per the Cochrane collaboration recommendations. Study quality was assessed using the QUADAS-2 tool, which considers the risk of bias and applicability. Six out of a hundred and eleven citations met the inclusion criteria and reported QUANTA Flash® PR3 diagnostic accuracy in UC vs. CD (UC, n = 667, CD, n = 682 patients). The sensitivity/specificity point estimate for UC was 34.9%/95.9%. This resulted in a Diagnostic Odds Ratio (DOR) of 12.6. The risk of bias was low in the index test and reference standard domains. Four of the six studies (67%) showed an unclear risk of bias in patient selection and in flow and timing domains. All studies had low concerns about applicability in all the domains. PR3-ANCA measured with the QUANTA Flash® PR3 assay represent novel diagnostic markers in IBD and enables discrimination between UC and CD.
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Affiliation(s)
- Carmen Andalucía
- Research and Development, Headquarters & Technology Center Autoimmunity, Werfen, San Diego, CA 92121, USA; (C.A.); (L.M.-P.); (C.B.); (M.A.A.)
| | - Laura Martínez-Prat
- Research and Development, Headquarters & Technology Center Autoimmunity, Werfen, San Diego, CA 92121, USA; (C.A.); (L.M.-P.); (C.B.); (M.A.A.)
| | - Chelsea Bentow
- Research and Development, Headquarters & Technology Center Autoimmunity, Werfen, San Diego, CA 92121, USA; (C.A.); (L.M.-P.); (C.B.); (M.A.A.)
| | - Mary Ann Aure
- Research and Development, Headquarters & Technology Center Autoimmunity, Werfen, San Diego, CA 92121, USA; (C.A.); (L.M.-P.); (C.B.); (M.A.A.)
| | - Michael P. Horn
- Department of Clinical Chemistry, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland;
| | - Michael Mahler
- Research and Development, Headquarters & Technology Center Autoimmunity, Werfen, San Diego, CA 92121, USA; (C.A.); (L.M.-P.); (C.B.); (M.A.A.)
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Ahmed AA, El Shahawy AA, Kadry HM, Said NM. Performance of two multiplex flow cytometric assays for antibody detection in Egyptian patients. Afr J Lab Med 2023; 12:2099. [PMID: 37293321 PMCID: PMC10244819 DOI: 10.4102/ajlm.v12i1.2099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 03/22/2023] [Indexed: 06/10/2023] Open
Abstract
Background Autoantibodies are vital biomarkers for the diagnosis, assessment and prognostic determination of various autoimmune disorders. Objective This study aimed to evaluate the performance of the two AtheNA Multi-Lyte® systems for the detection of various autoantibodies. Methods A total of 105 systemic lupus erythematosus patients, 35 patients with other autoimmune diseases (diseased controls), and 30 healthy volunteers (healthy controls) at Zagazig University Hospitals, Zagazig city, Al Sharqia governorate were tested for anti-double-stranded DNA (anti-dsDNA) antibodies using indirect immunofluorescence (IIF) and the AtheNA Multi-Lyte® anti-nuclear antibodies-II system between May 2020 and April 2022. Seventy-five patients with clinically suspected autoimmune vasculitis (AIV) and 25 healthy volunteers were also tested for anti-myeloperoxidase and anti-proteinase 3 antibodies using IIF, the AtheNA Multi-Lyte® AIV system, and enzyme-linked immunosorbent assay (ELISA). Results The AtheNA anti-dsDNA test (98.5%) was more specific than IIF (96.9%) for diagnosing systemic lupus erythematosus, but both tests had the same sensitivity (38.1%). Combining both methods increased sensitivity to 47.6%, while increasing the cut-off of the AtheNA anti-dsDNA test to 134 international units/mL increased specificity to 100%. The AtheNA Multi-Lyte AIV system exhibited substantial agreement with IIF regarding anti-myeloperoxidase testing (κ = 0.65) and almost perfect agreement with ELISA (κ = 0.85). The AtheNA Multi-Lyte® AIV system exhibited perfect agreement with IIF (κ = 1) and substantial agreement with ELISA for anti-proteinase 3 testing (κ = 0.63). Conclusion AtheNA Multi-Lyte® systems appear to be reliable for anti-dsDNA, anti-myeloperoxidase, and anti-proteinase 3 screening and may be an optimal choice for monitoring anti-dsDNA levels. What this study adds It is necessary to evaluate various autoantibodies detection assays to increase both sensitivity and specificity of autoimmune diseases diagnostic approaches. AtheNA Multi-Lyte® systems appear to be reliable for anti-dsDNA, anti-myeloperoxidase, and anti-proteinase 3 screening and may be an optimal choice for monitoring anti-dsDNA levels.
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Affiliation(s)
- Alshymaa A Ahmed
- Department of Clinical Pathology, Faculty of Medicine, Zagazig University, Zagazig City, Egypt
| | - Alia A El Shahawy
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Zagazig University, Zagazig City, Egypt
| | - Heba M Kadry
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Zagazig University, Zagazig City, Egypt
| | - Nora M Said
- Department of Clinical Pathology, Faculty of Medicine, Zagazig University, Zagazig City, Egypt
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PR3-ANCAs Detected by Third-Generation ELISA Predicts Severe Disease and Poor Survival in Primary Sclerosing Cholangitis. Diagnostics (Basel) 2022; 12:diagnostics12112682. [PMID: 36359524 PMCID: PMC9689935 DOI: 10.3390/diagnostics12112682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 09/21/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022] Open
Abstract
A highly sensitive detection of anti-neutrophil cytoplasmic antibodies to serine proteinase-3 (PR3-ANCAs) aids in the serological diagnosis of autoimmune liver disorders and the prediction of severity in primary sclerosing cholangitis (PSC). Here, we evaluate a novel third-generation ELISA for the detection of PR3-ANCAs. In total, 309 patients with PSC, 51 with primary biliary cholangitis (PBC), and 120 healthy blood donors (BD) were analyzed. For the survival analysis in PSC, the outcome was defined as liver-transplantation-free survival during the follow-up. Positive PR3-ANCA levels were found in 74/309 (24.0%) of patients with PSC. No BDs and one patient with PBC demonstrated PR3-ANCA positivity. PR3-ANCAs were revealed as independent predictors for a poor PSC outcome (study endpoint: liver transplantation/death, log-rank test, p = 0.02). PR3-ANCA positivity, lower albumin levels, and higher bilirubin concentrations were independent risks of a poor survival (Cox proportional-hazards regression analysis, p < 0.05). The Mayo risk score for PSC was associated with PR3-ANCA positivity (p = 0.01) and the disease severity assessed with a model of end-stage liver disease (MELD) and extended MELD-Na (p < 0.05). PR3-ANCAs detected by a third-generation ELISA are diagnostic and prognostic markers for PSC. Their wider use could help to identify patients who are at-risk of a more severe disease.
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Ashraf A, Daloya J, Rana V, Ahmed A, Kaell A. Diagnosing and Managing Clinically Silent Lupus Nephritis and Anti-neutrophil Cytoplasmic Antibody-Associated Vasculitis Overlap Syndrome: A Clinical Challange. Cureus 2022; 14:e24624. [PMID: 35651411 PMCID: PMC9138203 DOI: 10.7759/cureus.24624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/30/2022] [Indexed: 11/05/2022] Open
Abstract
Lupus nephritis is typically associated with anti-nuclear antibodies and anti-double-stranded DNA antibodies resulting in the intrarenal immune complex deposition. Levels of anti-double-stranded DNA antibodies reflect disease activity in these patients. With negative anti-double-stranded DNA antibodies, establishing a diagnosis of lupus nephritis is difficult. Lupus nephritis overlapped with anti-neutrophil cytoplasmic antibody-associated vasculitis is both a diagnostic and therapeutic dilemma. Herein, we describe a case of an asymptomatic 41-year-old female who had incidental findings of low hemoglobin and elevated serum creatinine. Making a clinical diagnosis of lupus nephritis and anti-neutrophil cytoplasmic antibody-associated vasculitis in an asymptomatic patient can be challenging and must be made based on the interpretation of evolving serology, imaging studies, and histopathology. Based on extensive workup, the patient was diagnosed with concurrent lupus nephritis and anti-neutrophil cytoplasmic antibody-associated vasculitis overlap syndrome warranting immediate immunosuppressive therapy.
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Ramponi G, Folci M, De Santis M, Damoiseaux JGMC, Selmi C, Brunetta E. The biology, pathogenetic role, clinical implications, and open issues of serum anti-neutrophil cytoplasmic antibodies. Autoimmun Rev 2021; 20:102759. [PMID: 33476813 DOI: 10.1016/j.autrev.2021.102759] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 12/05/2020] [Indexed: 12/11/2022]
Abstract
Anti-neutrophil cytoplasmic antibodies (ANCA) are a group of autoantibodies, predominantly IgG, involved in the pathogenesis of several autoimmune disorders, detected either through indirect immunofluorescence or enzyme-linked immunosorbent assay. By means of indirect immunofluorescence, the main patterns are C-ANCA (cytoplasmic) and P-ANCA (perinuclear), while proteinase 3 (PR3) and myeloperoxidase (MPO) represent the main autoantigens in granulomatosis with polyangiitis and microscopic polyangiitis, both belonging to the family of ANCA-associated vasculitis (AAV). While several experiments established the pathogenicity of MPO-ANCA, evidence remains elusive for PR3-ANCA and an additional target antigen, i.e. LAMP2, has been postulated with specific clinical relevance. The presence of a subset of AAV without ANCA may be explained by the presence of further target antigens or the presence of molecules in blood which make ANCA undetectable. A rise in ANCA titers is not necessarily predictive of a flare of disease in AAV if not accompanied by clinical manifestations. ANCA may develop through variable mechanisms, such as autoantigen complementarity, apoptosis impairment, neutrophil extracellular traps dysfunction and molecular mimicry. We will provide herein a comprehensive review of the available evidence on the biological mechanisms, pathogenetic role, and clinical implications of ANCA testing and disease management. Further, we will address the remaining open challenges in the field, including the role of ANCA in inflammatory bowel disease and in cocaine-induced vasculitis.
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Affiliation(s)
- Giacomo Ramponi
- Humanitas Clinical and Research Center - IRCCS, 20089, Rozzano, Milan, Italy
| | - Marco Folci
- Humanitas Clinical and Research Center - IRCCS, 20089, Rozzano, Milan, Italy
| | - Maria De Santis
- Humanitas Clinical and Research Center - IRCCS, 20089, Rozzano, Milan, Italy
| | - Jan G M C Damoiseaux
- Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, Netherlands
| | - Carlo Selmi
- Humanitas Clinical and Research Center - IRCCS, 20089, Rozzano, Milan, Italy; Department of Biomedical Sciences, Humanitas University, Milan, Italy.
| | - Enrico Brunetta
- Humanitas Clinical and Research Center - IRCCS, 20089, Rozzano, Milan, Italy
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Romero-Sánchez C, Benavides-Solarte M, Galindo-Ibáñez I, Ospina-Caicedo AI, Parra-Izquierdo V, Chila-Moreno L, Villa A, Casas-Gómez MC, Angarita I, Bautista-Molano W, Romero-Álvarez V, Bello-Gualtero JM. Frequency of Positive ANCA Test in a Population With Clinical Symptoms Suggestive of Autoimmune Disease and the Interference of ANA in its Interpretation. REUMATOLOGIA CLINICA 2020; 16:473-479. [PMID: 30704921 DOI: 10.1016/j.reuma.2018.09.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 08/30/2018] [Accepted: 09/20/2018] [Indexed: 01/04/2023]
Abstract
BACKGROUND Antibodies against neutrophil cytoplasm (ANCA) are associated with vasculitis. There are different methods to determine their presence. The interference of antinuclear antibodies (ANA) in the differentiation between P-ANCA and C-ANCA patterns has been described. OBJECTIVE To determine the frequency of ANCA in a population with manifestations of autoimmune disease, and evaluate the interference of ANA in its interpretation. MATERIALS AND METHODS Retrospective, descriptive nonexperimental cross-sectional study, including 3,330 data. The presumptive diagnosis was autoimmune disease and a test for ANCA was requested. The ANCA and ANA determinations were made by indirect immunofluorescence, L-ANCA® and CytoBead® ANCA. Anti-proteinase 3 and anti-myeloperoxidase were detected by ELISA and CytoBead® ANCA. RESULTS ANCAs were positive in 10.21% and 12.64% of those positive for ANCA were positive for ANA. The inter-rater agreement statistic (Kappa) for anti-PR3 between CytoBead ANCA and ELISA was 100% (K=1.00; P<.05) and the agreement between anti- myeloperoxidase by ELISA and CytoBead® ANCA was high (K=0.94; P<.05). 30% of those with ANCAs had a diagnosis of a type of vasculitis; 20% of them had an autoimmune disease. CONCLUSIONS The results suggest an overestimated request for ANCAs as a diagnostic aid in primary care which was not addressed. For an adequate evaluation of ANCAs, the indirect immunofluorescence technique should be implemented for the control and confirmation with the determination of specific antigens for anti- proteinase 3 and anti- myeloperoxidase in any of the confirmatory assays. The high concordance shown by ANCA CytoBeads makes us consider the use of this alternative for the determination of ANCAs and the confirmation. Given the interference of ANAs, the ANA test by IFI in the presence of positive P-ANCA results is recommended in order to minimize "false positives".
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Affiliation(s)
- Consuelo Romero-Sánchez
- Servicio de Reumatología e Inmunología, Hospital Militar Central, Facultad de Medicina, Grupo de Inmunología Clínica Aplicada, Universidad Militar Nueva Granada, Bogotá, Colombia; Facultad de Medicina, Programa de Reumatología, Universidad de la Sabana, Chía, Colombia; Instituto de Referencia Andino, Bogotá, Colombia; Instituto UIBO, Universidad El Bosque, Bogotá, Colombia.
| | - Mario Benavides-Solarte
- Servicio de Reumatología e Inmunología, Hospital Militar Central, Facultad de Medicina, Grupo de Inmunología Clínica Aplicada, Universidad Militar Nueva Granada, Bogotá, Colombia
| | - Isabel Galindo-Ibáñez
- Facultad de Ciencias Básicas, Universidad Colegio Mayor de Cundinamarca, Bogotá, Colombia
| | - Ana Isabel Ospina-Caicedo
- Servicio de Reumatología e Inmunología, Hospital Militar Central, Facultad de Medicina, Grupo de Inmunología Clínica Aplicada, Universidad Militar Nueva Granada, Bogotá, Colombia
| | | | - Lorena Chila-Moreno
- Facultad de Ciencias Básicas, Universidad Colegio Mayor de Cundinamarca, Bogotá, Colombia
| | - Amanda Villa
- Instituto de Referencia Andino, Bogotá, Colombia
| | | | - Ignacio Angarita
- Facultad de Medicina, Programa de Reumatología, Universidad de la Sabana, Chía, Colombia
| | - Wilson Bautista-Molano
- Servicio de Reumatología e Inmunología, Hospital Militar Central, Facultad de Medicina, Grupo de Inmunología Clínica Aplicada, Universidad Militar Nueva Granada, Bogotá, Colombia; Instituto UIBO, Universidad El Bosque, Bogotá, Colombia
| | - Verónica Romero-Álvarez
- Servicio de Reumatología e Inmunología, Hospital Militar Central, Facultad de Medicina, Grupo de Inmunología Clínica Aplicada, Universidad Militar Nueva Granada, Bogotá, Colombia
| | - Juan Manuel Bello-Gualtero
- Servicio de Reumatología e Inmunología, Hospital Militar Central, Facultad de Medicina, Grupo de Inmunología Clínica Aplicada, Universidad Militar Nueva Granada, Bogotá, Colombia
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Nagy G, Csípő I, Tarr T, Szűcs G, Szántó A, Bubán T, Sipeki N, Szekanecz Z, Papp M, Kappelmayer J, Antal-Szalmás P. Anti-neutrophil cytoplasmic antibody testing by indirect immunofluorescence: Computer-aided versus conventional microscopic evaluation of routine diagnostic samples from patients with vasculitis or other inflammatory diseases. Clin Chim Acta 2020; 511:117-124. [PMID: 33002474 DOI: 10.1016/j.cca.2020.09.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 08/29/2020] [Accepted: 09/21/2020] [Indexed: 12/30/2022]
Abstract
BACKGROUND Detection of anti-neutrophil cytoplasmic antibodies (ANCA) by indirect immunofluorescence assays (IFA) is of diagnostic importance in vasculitides and some other inflammatory diseases. Automation of IFA may be beneficial in high-throughput clinical laboratories. An analytical appraisal of the EUROPattern (EPa) automated microscope and image analysis system has not been reported in a routine clinical laboratory setting testing samples from both vasculitis and non-vasculitis patients. METHODS Results of EPa and on-screen ANCA pattern recognition of 568 consecutive routine serum samples were compared to those of conventional visual evaluation. RESULTS Agreement of discrimination between negative and non-negative samples was 86.1% comparing EPa and conventional reading, and it increased to 96.7% after on-screen user validation. Importantly, from the 334 samples classified as negative by EPa 328 (98.2%) were also negative by conventional evaluation. Pattern recognition showed 'moderate' agreement between classical microscopic and EPa analysis (κ = 0.446) and 'very good' agreement after user validation (κ = 0.900). Misclassification by EPa was dominantly due to the presence of anti-nuclear/cytoplasmic antibodies (incorrect pattern, 80/568) and the lower fluorescence cut-off of the automated microscope (false positives, 73/568). CONCLUSIONS Automated ANCA testing by EPa is a reliable alternative of classical microscopic evaluation, though classification of sera needs correction by trained personnel during on-screen validation.
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Affiliation(s)
- Gábor Nagy
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - István Csípő
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Tünde Tarr
- Institute of Internal Medicine, Department of Clinical Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Gabriella Szűcs
- Institute of Internal Medicine, Department of Rheumatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Antónia Szántó
- Institute of Internal Medicine, Department of Clinical Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Tamás Bubán
- Institute of Internal Medicine, Department of Gastroenterology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Nóra Sipeki
- Institute of Internal Medicine, Department of Gastroenterology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Zoltán Szekanecz
- Institute of Internal Medicine, Department of Rheumatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Mária Papp
- Institute of Internal Medicine, Department of Gastroenterology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - János Kappelmayer
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Péter Antal-Szalmás
- Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.
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Lopens S, Krawczyk M, Papp M, Milkiewicz P, Schierack P, Liu Y, Wunsch E, Conrad K, Roggenbuck D. The search for the Holy Grail: autoantigenic targets in primary sclerosing cholangitis associated with disease phenotype and neoplasia. AUTO- IMMUNITY HIGHLIGHTS 2020; 11:6. [PMID: 32178720 PMCID: PMC7077156 DOI: 10.1186/s13317-020-00129-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 03/06/2020] [Indexed: 12/22/2022]
Abstract
Unlike in other autoimmune liver diseases such as autoimmune hepatitis and primary biliary cholangitis, the role and nature of autoantigenic targets in primary sclerosing cholangitis (PSC), a progressive, chronic, immune-mediated, life threatening, genetically predisposed, cholestatic liver illness, is poorly elucidated. Although anti-neutrophil cytoplasmic antibodies (ANCA) have been associated with the occurrence of PSC, their corresponding targets have not yet been identified entirely. Genome-wide association studies revealed a significant number of immune-related and even disease-modifying susceptibility loci for PSC. However, these loci did not allow discerning a clear autoimmune pattern nor do the therapy options and the male gender preponderance in PSC support a pathogenic role of autoimmune responses. Nevertheless, PSC is characterized by the co-occurrence of inflammatory bowel diseases (IBD) demonstrating autoimmune responses. The identification of novel autoantigenic targets in IBD such as the major zymogen granule membrane glycoprotein 2 (GP2) or the appearance of proteinase 3 (PR3) autoantibodies (autoAbs) have refocused the interest on a putative association of loss of tolerance with the IBD phenotype and consequently with the PSC phenotype. Not surprisingly, the report of an association between GP2 IgA autoAbs and disease severity in patients with PSC gave a new impetus to autoAb research for autoimmune liver diseases. It might usher in a new era of serological research in this field. The mucosal loss of tolerance against the microbiota-sensing GP2 modulating innate and adaptive intestinal immunity and its putative role in the pathogenesis of PSC will be elaborated in this review. Furthermore, other potential PSC-related autoantigenic targets such as the neutrophil PR3 will be discussed. GP2 IgA may represent a group of new pathogenic antibodies, which share characteristics of both type 2 and 3 of antibody-mediated hypersensitive reactions according to Coombs and Gell.
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Affiliation(s)
| | - Marcin Krawczyk
- Department of Medicine II, Saarland University Hospital, Saarland University, Homburg/Saar, Germany
- Liver and Internal Medicine Unit, Medical University of Warsaw, Warsaw, Poland
| | - Maria Papp
- Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Piotr Milkiewicz
- Liver and Internal Medicine Unit, Medical University of Warsaw, Warsaw, Poland
| | - Peter Schierack
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany
| | - Yudong Liu
- Department of Laboratory Medicine, Peking University People's Hospital, Beijing, China
| | - Ewa Wunsch
- Translational Medicine Group, Pomeranian Medical University, Szczecin, Poland
| | - Karsten Conrad
- Institute of Immunology, Technical University Dresden, Dresden, Germany
| | - Dirk Roggenbuck
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany.
- Faculty of Health Sciences, Joint Faculty of the Brandenburg University of Technology Cottbus-Senftenberg, the Brandenburg Medical School Theodor Fontane and the University of Potsdam, Universitätsplatz 1, 01968, Senftenberg, Germany.
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9
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Deutschmann C, Sowa M, Murugaiyan J, Roesler U, Röber N, Conrad K, Laass MW, Bogdanos D, Sipeki N, Papp M, Rödiger S, Roggenbuck D, Schierack P. Identification of Chitinase-3-Like Protein 1 as a Novel Neutrophil Antigenic Target in Crohn's Disease. J Crohns Colitis 2019; 13:894-904. [PMID: 30753386 PMCID: PMC6657965 DOI: 10.1093/ecco-jcc/jjz012] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND AND AIMS There is an increasing incidence of inflammatory bowel disease [IBD]. Autoimmune responses are involved in the pathophysiology of IBD, but their underlying pathways and target antigens have not yet been fully elucidated. METHODS Autoantigenic targets in IBD were identified after separation of whole cell proteins isolated from neutrophils using two-dimensional electrophoresis and matrix assisted laser desorption ionization - time of flight mass spectrometry-based protein identification of the spots that displayed Western blotting signals with anti-neutrophil cytoplasmic antibody-positive sera. The prevalence of IgG, IgA and secretory IgA [sIgA] to chitinase 3-like protein 1 [CHI3L1] was analysed by enzyme-linked immunosorbent assays using recombinant CHI3L1 in 110 patients with Crohn's disease [CD], 95 with ulcerative colitis [UC], 126 with coeliac disease [CeD] and 86 healthy controls [HCs]. RESULTS The 18-glycosylhydrolase family member CHI3L1 was identified as a neutrophil autoantigenic target. CD patients displayed significantly higher levels of IgG to CHI3L1 than patients with UC and CeD (p < 0.0001, respectively). IgA and sIgA to CHI3L1 was significantly higher in CD than in UC, CeD and HCs [p < 0.0001, respectively]. IgA and sIgA to CHI3L1 demonstrated the highest prevalence in CD [25.5%, 28/110; and 41.8%%, 46/110] compared to HCs [2.3%, 2/86; and 4.7%%, 4/86; p = 0.0015 and p < 0.0001] and are associated with a more complicated progression of CD. CONCLUSION CHI3L1 is a novel neutrophil autoantigenic target in CD. IgA and sIgA to CHI3L1 may serve as novel markers for CD and may facilitate the serological diagnosis of IBD.
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Affiliation(s)
- Claudia Deutschmann
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Universitätsplatz, Senftenberg, Germany
| | - Mandy Sowa
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Universitätsplatz, Senftenberg, Germany,Medipan/GA Generic Assays GmbH, Ludwig-Erhard-Ring, Dahlewitz, Berlin, Germany
| | - Jayaseelan Murugaiyan
- Institute for Animal Hygiene and Environmental Health, Freie Universität Berlin, Centre for Infectious Medicine, Robert-von-Ostertag-Str., Berlin, Germany,Department of Biotechnology, SRM University-AP, Amaravati, India
| | - Uwe Roesler
- Institute for Animal Hygiene and Environmental Health, Freie Universität Berlin, Centre for Infectious Medicine, Robert-von-Ostertag-Str., Berlin, Germany
| | - Nadja Röber
- Institute of Immunology, Medical Faculty Carl Gustav Carus, Technical University Dresden, Fetscherstraße, Dresden, Germany
| | - Karsten Conrad
- Institute of Immunology, Medical Faculty Carl Gustav Carus, Technical University Dresden, Fetscherstraße, Dresden, Germany
| | - Martin W Laass
- Children’s Hospital, Medical Faculty Carl Gustav Carus, Technical University Dresden, Fetscherstraße, Dresden, Germany
| | - Dimitrios Bogdanos
- Department of Rheumatology, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Nora Sipeki
- Department of Internal Medicine, Division of Gastroenterology, Faculty of Medicine, University of Debrecen, Nagyerdei krt., Debrecen, Hungary
| | - Maria Papp
- Department of Internal Medicine, Division of Gastroenterology, Faculty of Medicine, University of Debrecen, Nagyerdei krt., Debrecen, Hungary
| | - Stefan Rödiger
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Universitätsplatz, Senftenberg, Germany
| | - Dirk Roggenbuck
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Universitätsplatz, Senftenberg, Germany,Medipan/GA Generic Assays GmbH, Ludwig-Erhard-Ring, Dahlewitz, Berlin, Germany
| | - Peter Schierack
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Universitätsplatz, Senftenberg, Germany,Corresponding author: Prof. Dr Peter Schierack, Faculty Environment and Natural Sciences, Brandenburg University of Technology, Universitätsplatz 1, 01968 Senftenberg, Germany. Tel: +49 (0) 3573 85 932; Fax: +49 (0) 3573 85 909;
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10
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Damoiseaux J, Heijnen I, Van Campenhout C, Eriksson C, Fabien N, Herold M, van der Molen RG, Egner W, Patel D, Plaza-Lopez A, Radice A, de Sousa MJR, Viander M, Shoenfeld Y. An international survey on anti-neutrophil cytoplasmic antibodies (ANCA) testing in daily clinical practice. Clin Chem Lab Med 2019; 56:1759-1770. [PMID: 28710880 DOI: 10.1515/cclm-2017-0306] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 05/29/2017] [Indexed: 12/22/2022]
Abstract
Abstract
Background:
Detection of anti-neutrophil cytoplasmic antibodies (ANCA) is important for the diagnosis of the ANCA-associated vasculitides (AAV). For AAV, especially ANCA directed against myeloperoxidase (MPO) and proteinase 3 (PR3) are most relevant. ANCA with less well-defined specificities may, however, also be detected in other inflammatory and non-inflammatory conditions.
Methods:
A questionnaire, initiated by the European Autoimmunity Standardisation Initiative (EASI), was used to gather information on methods and testing algorithms used for ANCA in clinical laboratories of 12 European countries (EASI survey).
Results:
Four hundred and twenty-nine responses were included in the EASI survey analysis which revealed differences within countries and between countries. Laboratories overall were poor in adherence to international consensus on ANCA testing. Substantial variation was observed with respect to the use of ANCA indirect immunofluorescence (IIF) in the algorithm, application of distinct methods for MPO- and PR3-ANCA, the daily availability of new ANCA results, and interpretation of test results.
Conclusions:
Awareness of these differences may stimulate further harmonization and standardization of ANCA testing. This may be promoted by an update of the international ANCA consensus and the introduction of international standards.
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Affiliation(s)
- Jan Damoiseaux
- Central Diagnostic Laboratory, Maastricht University Medical Center, P. Debyelaan 25, 6229 HX Maastricht, The Netherlands
| | - Ingmar Heijnen
- Medical Immunology, Laboratory Medicine, University Hospital Basel, Basel, Switzerland
| | | | - Catharina Eriksson
- Department of Clinical Immunology/Microbiology, Umeå University, Umeå, Sweden
| | - Nicole Fabien
- Department of Immunology, UF Autoimmunity, Hospices Civils de Lyon, CHLS, Pierre-Benite, France
| | - Manfred Herold
- Department of Internal Medicine/Rheumatology unit, Innsbruck Medical University, Innsbruck, Austria
| | - Renate G van der Molen
- Department of Laboratory Medicine, Laboratory of Medical Immunology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - William Egner
- UK NEQAS Immunology, Immunochemistry and Allergy, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Dina Patel
- UK NEQAS Immunology, Immunochemistry and Allergy, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Aresio Plaza-Lopez
- Department of Immunology, Hospital Universitario Puerta de Hierro, Majadahonda, Spain
| | - Antonella Radice
- Microbiology Institute, San Carlo Borromeo Hospital, Milan, Italy - on behalf of the Italian Forum on Autoimmune Disease Research (FIRMA)
| | - Marie José Rego de Sousa
- Immunopathology and Autoimmunity Department, Centro de Medicina Laboratorial Germano de Sousa, Lisbon, Portugal
| | - Markku Viander
- Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
| | - Yehuda Shoenfeld
- Zabludowicz Center for Autoimmune Diseases, Sheba Medical Center, Tel-Hashomer, Israel
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11
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van Beers JJBC, Vanderlocht J, Roozendaal C, Damoiseaux J. Detection of Anti-neutrophil Cytoplasmic Antibodies (ANCA) by Indirect Immunofluorescence. Methods Mol Biol 2019; 1901:47-62. [PMID: 30539567 DOI: 10.1007/978-1-4939-8949-2_4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The eventual presence of anti-neutrophil cytoplasmic antibodies (ANCA) can initially be screened with indirect immunofluorescence (IIF). The majority of laboratories that facilitate ANCA testing use commercial kits. Although in-house assays are not encouraged in routine clinical laboratories, knowledge on the methodological aspects of the assay remains of importance. These aspects include choice of substrate, choice of fixative, staining procedure, and interpretation procedure. In this paper details on the methodology are provided and discussed in the context of the clinical application.
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Affiliation(s)
- J J B C van Beers
- Central Diagnostic Laboratory, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - J Vanderlocht
- Central Diagnostic Laboratory, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - C Roozendaal
- Department of Laboratory Medicine, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands
| | - J Damoiseaux
- Central Diagnostic Laboratory, Maastricht University Medical Centre, Maastricht, The Netherlands.
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12
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Mahler M, Damoiseaux J, Ballet V, Dillaerts D, Bentow C, Cohen Tervaert JW, Blockmans D, Boeckxstaens G, Aguilera-Lizarraga J, Csernok E, Vermeire S, Bossuyt X. PR3-anti-neutrophil cytoplasmic antibodies (ANCA) in ulcerative colitis. Clin Chem Lab Med 2018; 56:e27-e30. [PMID: 28755529 DOI: 10.1515/cclm-2017-0346] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 06/21/2017] [Indexed: 12/27/2022]
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13
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Sowa M, Kolenda R, Baumgart DC, Pratschke J, Papp M, Tornai T, Suchanski J, Bogdanos DP, Mytilinaiou MG, Hammermann J, Laass MW, Conrad K, Schramm C, Franke A, Roggenbuck D, Schierack P. Mucosal Autoimmunity to Cell-Bound GP2 Isoforms Is a Sensitive Marker in PSC and Associated With the Clinical Phenotype. Front Immunol 2018; 9:1959. [PMID: 30233574 PMCID: PMC6127632 DOI: 10.3389/fimmu.2018.01959] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 08/08/2018] [Indexed: 12/12/2022] Open
Abstract
Introduction: Zymogen granule glycoprotein 2 (GP2) was demonstrated as first autoimmune mucosal target in primary sclerosing cholangitis (PSC) associated with disease severity. Autoantibodies to four GP2 isoforms (aGP21-4) were found in patients with inflammatory bowel diseases but reactivity against specific GP2 epitopes has not been investigated in PSC yet. Hence, the prevalence of aGP21-4 and their association with the PSC phenotype for risk prediction were examined. Methods: GP2 isoforms were stably expressed as glycosylphosphatidyl - inositol-anchored molecules in the membrane of HEp-2 cells and used as autoantigenic targets in indirect immunofluorescence assay (IFA). aGP21-4 IgA and IgG were detected by IFA in 212 PSC patients of four European university hospitals and 145 controls comprising 95 patients with cystic fibrosis and 50 healthy subjects. Results: Combined aGP21 and aGP24 IgA testing with a sensitivity of 66.0% and a specificity of 97.9% resulted in the best diagnostic performance (Youden index: 0.64) regarding all aGP2 and combinations thereof. aGP24 IgA positivity is significantly associated with the presence of cirrhosis in PSC (p = 0.0056). Logistic regression revealed the occurrence of aGP21 IgA (odds ratio [OR] 1.38, 95% confidence interval [CI]: 1.03-1.86) and aGP24 IgA (OR 1.52, 95%CI: 1.07-2.15) along with male gender (OR 0.51, 95%CI: 0.27-0.97) and older age (OR 1.03 95%CI: 1.01-1.05) as significant risks for the concomitant presence of cirrhosis in PSC. Conclusions: Combined aGP21 and aGP24 IgA analysis is preferred to single aGP2 isoform analysis for sensitive PSC autoantibody testing. Positivity for aGP21 and aGP24 IgA is associated with cirrhosis in PSC and could be used for risk stratification.
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Affiliation(s)
- Mandy Sowa
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus–Senftenberg, Senftenberg, Germany
| | - Rafał Kolenda
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus–Senftenberg, Senftenberg, Germany
- Department of Biochemistry and Molecular Biology, Faculty of Veterinary Medicine, University of Environmental and Life Sciences, Wroclaw, Poland
| | - Daniel C. Baumgart
- Inflammatory Bowel Disease Center, Department of Gastroenterology and Hepatology, Charité Medical School, Humboldt-University of Berlin, Berlin, Germany
| | - Johann Pratschke
- Department of Surgery, Charité Medical School, Humboldt-University of Berlin, Berlin, Germany
| | - Maria Papp
- Department of Internal Medicine, Division of Gastroenterology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Tamas Tornai
- Department of Internal Medicine, Division of Gastroenterology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Jaroslaw Suchanski
- Department of Biochemistry and Molecular Biology, Faculty of Veterinary Medicine, University of Environmental and Life Sciences, Wroclaw, Poland
| | - Dimitrios P. Bogdanos
- Division of Transplantation Immunology and Mucosal Biology, King's College London School of Medicine at King‘s College Hospital, London, United Kingdom
- Department of Rheumatology and Clinical Immunology, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Maria G. Mytilinaiou
- Division of Transplantation Immunology and Mucosal Biology, King's College London School of Medicine at King‘s College Hospital, London, United Kingdom
- Department of Rheumatology and Clinical Immunology, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Jutta Hammermann
- Children's Hospital, Medical Faculty Carl Gustav Carus, Technical University Dresden, Dresden, Germany
| | - Martin W. Laass
- Children's Hospital, Medical Faculty Carl Gustav Carus, Technical University Dresden, Dresden, Germany
| | - Karsten Conrad
- Institute of Immunology, Technical University Dresden, Dresden, Germany
| | - Christoph Schramm
- I. Department of Medicine and Martin Zeitz Centre for Rare Diseases, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Andre Franke
- Institute of Clinical Molecular Biology, Christian-Albrechts-University, Kiel, Germany
| | - Dirk Roggenbuck
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus–Senftenberg, Senftenberg, Germany
- GA Generic Assays GmbH, Berlin, Germany
| | - Peter Schierack
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus–Senftenberg, Senftenberg, Germany
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14
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Bossuyt X, Cohen Tervaert JW, Arimura Y, Blockmans D, Flores-Suárez LF, Guillevin L, Hellmich B, Jayne D, Jennette JC, Kallenberg CGM, Moiseev S, Novikov P, Radice A, Savige JA, Sinico RA, Specks U, van Paassen P, Zhao MH, Rasmussen N, Damoiseaux J, Csernok E. Position paper: Revised 2017 international consensus on testing of ANCAs in granulomatosis with polyangiitis and microscopic polyangiitis. Nat Rev Rheumatol 2017; 13:683-692. [PMID: 28905856 DOI: 10.1038/nrrheum.2017.140] [Citation(s) in RCA: 231] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Anti-neutrophil cytoplasmic antibodies (ANCAs) are valuable laboratory markers used for the diagnosis of well-defined types of small-vessel vasculitis, including granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA). According to the 1999 international consensus on ANCA testing, indirect immunofluorescence (IIF) should be used to screen for ANCAs, and samples containing ANCAs should then be tested by immunoassays for proteinase 3 (PR3)-ANCAs and myeloperoxidase (MPO)-ANCAs. The distinction between PR3-ANCAs and MPO-ANCAs has important clinical and pathogenic implications. As dependable immunoassays for PR3-ANCAs and MPO-ANCAs have become broadly available, there is increasing international agreement that high-quality immunoassays are the preferred screening method for the diagnosis of ANCA-associated vasculitis. The present Consensus Statement proposes that high-quality immunoassays can be used as the primary screening method for patients suspected of having the ANCA-associated vaculitides GPA and MPA without the categorical need for IIF, and presents and discusses evidence to support this recommendation.
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Affiliation(s)
- Xavier Bossuyt
- Department of Microbiology and Immunology, University of Leuven and Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Herestraat 49, 3000 Leuven, Belgium
| | | | - Yoshihiro Arimura
- Kichijoji Asahi Hospital, 11-30-12 Kichijoji Honcho, Musashino, Tokyo 181-8611, Japan
| | - Daniel Blockmans
- Clinical Department of General Internal Medicine, Research Department of Microbiology and Immunology and Laboratory of Clinical Infectious and Inflammatory Disorders, University Hospitals Leuven, Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Luis Felipe Flores-Suárez
- Primary Systemic Vasculitides Clinic, Instituto Nacional de Enfermedades Respiratorias, Calzada de Tlalpan 4502, Colonia Sección XVI, CP 14080, Mexico City, Mexico
| | - Loïc Guillevin
- National Referral Centre for Necrotizing Vasculitides and Systemic Sclerosis, Université Paris Descartes, Hôpital Cochin, L'Assistance Publique-Hôpitaux de Paris, 27 Rue du Faubourg Saint-Jacques, Paris 75014, France
| | - Bernhard Hellmich
- Department of Internal Medicine, Rheumatology and Immunology, Vasculitis-Centre Tübingen-Kirchheim, Medius Klinik Kirchheim, University of Tübingen, Eugenstrasse 3, 73230 Kirchheim unter Teck, Germany
| | - David Jayne
- Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0SP, UK
| | - J Charles Jennette
- Department of Pathology and Laboratory Medicine, University of North Carolina, 160 Medical Drive, Chapel Hill, North Carolina 27599, USA
| | - Cees G M Kallenberg
- Department of Rheumatology and Clinical Immunology, AA21, University Medical Centre Groningen, University of Groningen, PO Box 30.001, 9700 RB Groningen, Netherlands
| | - Sergey Moiseev
- Clinic of Nephrology, Internal and Occupational Diseases, Sechenov First Moscow State Medical University, Rossolimo, 11/5, Moscow 119435, Russia
| | - Pavel Novikov
- Clinic of Nephrology, Internal and Occupational Diseases, Sechenov First Moscow State Medical University, Rossolimo, 11/5, Moscow 119435, Russia
| | - Antonella Radice
- Microbiology and Virology Institute, ASST Santi Paolo e Carlo, San Carlo Borromeo Hospital, Via Pio II 3, 20153 Milan, Italy
| | - Judith Anne Savige
- Department of Medicine, Melbourne Health, The University of Melbourne, Grattan Street, Parkville, Melbourne VIC 3050, Australia
| | - Renato Alberto Sinico
- Department of Medicine and Surgery, Università degli Studi di Milano-Bicocca, Via Cadore, 48, 20900 Monza MB, Italy
| | - Ulrich Specks
- Division of Pulmonary & Critical Medicine, Mayo Clinic, Rochester, 200 First Street, Rochester, Minnesota 55905, USA
| | - Pieter van Paassen
- Department of Internal Medicine, Section Nephrology and Immunology, Maastricht University Medical Centre, P. Debyelaan 25, 6229 HX Maastricht, Netherlands
| | - Ming-Hui Zhao
- Renal Division, Peking University First Hospital; Key Laboratory of Renal Disease, Ministry of Health of China; Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China; Peking-Tsinghua Centre for Life Sciences; 8 Xishiku Street, Xichengqu, Beijing Shi, China
| | - Niels Rasmussen
- Department of Autoimmunology and Biomarkers, Statens Seruminstitut, Artillerivej 5, 2300 Copenhagen S, Denmark
| | - Jan Damoiseaux
- Central Diagnostic Laboratory, Maastricht University Medical Centre, P. Debyelaan 25, 6229 HX Maastricht, Netherlands
| | - Elena Csernok
- Department of Internal Medicine, Rheumatology and Immunology, Vasculitis-Centre Tübingen-Kirchheim, Medius Klinik Kirchheim, University of Tübingen, Eugenstrasse 3, 73230 Kirchheim unter Teck, Germany
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15
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Sowa M, Hiemann R, Schierack P, Reinhold D, Conrad K, Roggenbuck D. Next-Generation Autoantibody Testing by Combination of Screening and Confirmation-the CytoBead® Technology. Clin Rev Allergy Immunol 2017; 53:87-104. [PMID: 27368807 PMCID: PMC5502073 DOI: 10.1007/s12016-016-8574-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Occurrence of autoantibodies (autoAbs) is a hallmark of autoimmune diseases, and the analysis thereof is an essential part in the diagnosis of organ-specific autoimmune and systemic autoimmune rheumatic diseases (SARD), especially connective tissue diseases (CTDs). Due to the appearance of autoAb profiles in SARD patients and the complexity of the corresponding serological diagnosis, different diagnostic strategies have been suggested for appropriate autoAb testing. Thus, evolving assay techniques and the continuous discovery of novel autoantigens have greatly influenced the development of these strategies. Antinuclear antibody (ANA) analysis by indirect immunofluorescence (IIF) on tissue and later cellular substrates was one of the first tests introduced into clinical routine and is still an indispensable tool for CTD serology. Thus, screening for ANA by IIF is recommended to be followed by confirmatory testing of positive findings employing different assay techniques. Given the continuous growth in the demand for autoAb testing, IIF has been challenged as the standard method for ANA and other autoAb analyses due to lacking automation, standardization, modern data management, and human bias in IIF pattern interpretation. To address these limitations of autoAb testing, the CytoBead® technique has been introduced recently which enables automated interpretation of cell-based IIF and quantitative autoAb multiplexing by addressable microbead immunoassays in one reaction environment. Thus, autoAb screening and confirmatory testing can be combined for the first time. The present review discusses the history of autoAb assay techniques in this context and gives an overview and outlook of the recent progress in emerging technologies.
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Affiliation(s)
- Mandy Sowa
- GA Generic Assays GmbH, Dahlewitz, Berlin, Germany
| | - Rico Hiemann
- Institute of Biotechnology, Faculty of Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany
| | - Peter Schierack
- Institute of Biotechnology, Faculty of Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany
| | - Dirk Reinhold
- Institute of Molecular and Clinical Immunology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Karsten Conrad
- Institute of Immunology, Medical Faculty, Technical University Dresden, Dresden, Germany
| | - Dirk Roggenbuck
- GA Generic Assays GmbH, Dahlewitz, Berlin, Germany.
- Institute of Biotechnology, Faculty of Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany.
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16
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Comparison of enzyme-linked immunosorbent assay and rapid chemiluminescent analyser in the detection of myeloperoxidase and proteinase 3 autoantibodies. Pathology 2017; 49:413-418. [DOI: 10.1016/j.pathol.2017.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 02/19/2017] [Accepted: 02/26/2017] [Indexed: 11/29/2022]
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17
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Csernok E, Kempiners N, Hellmich B. [Paradigm shift in ANCA diagnostics : New international consensus recommendations]. Z Rheumatol 2017; 76:143-148. [PMID: 28058500 DOI: 10.1007/s00393-016-0240-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND Up to now indirect immunofluorescence (IIF) followed by an antigen-specific assay specific for proteinase 3 (PR3) or myeloperoxidase (MPO) has been the standard method for the detection of antineutrophil cytoplasmic antibodies (ANCA). The development of more sensitive and highly specific PR3-ANCA and MPO-ANCA immunoassays for the diagnosis of ANCA-associated vasculitis (AAV) has raised doubts about the two-stage diagnostic strategy currently recommended for ANCA detection. OBJECTIVE Presentation and discussion of the new international consensus recommendations on ANCA testing in AAV. METHODS This article presents the new guidelines for ANCA testing that have been developed based on the results of a recent large multicenter study by the European Vasculitis Society (EUVAS). The draft of the author committee was revised by each contributor and subsequently distributed to 12 experts on 4 continents. After further revision the final document was returned for ratification and submitted for publication. RESULTS/CONCLUSION The current study results confirm the superiority of the diagnostic value of antigen-specific immunoassays compared to IIF. The current consensus recommendations support the primary use of PR3-ANCA and MPO-ANCA immunoassays for diagnostic evaluation of patients with AAV without the categorical need for additional IIF.
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Affiliation(s)
- E Csernok
- Referenzlabor für Vaskulitis-Immundiagnostik, Vaskulitiszentrum Süd, Klinik für Innere Medizin, Rheumatologie und Immunologie, Kreiskliniken Esslingen gGmbH, Klinik Kirchheim, Akademisches Lehrkrankenhaus der Universität Tübingen, Eugenstr. 3, 73230, Kirchheim unter Teck, Deutschland.
| | - N Kempiners
- Referenzlabor für Vaskulitis-Immundiagnostik, Vaskulitiszentrum Süd, Klinik für Innere Medizin, Rheumatologie und Immunologie, Kreiskliniken Esslingen gGmbH, Klinik Kirchheim, Akademisches Lehrkrankenhaus der Universität Tübingen, Eugenstr. 3, 73230, Kirchheim unter Teck, Deutschland
| | - B Hellmich
- Referenzlabor für Vaskulitis-Immundiagnostik, Vaskulitiszentrum Süd, Klinik für Innere Medizin, Rheumatologie und Immunologie, Kreiskliniken Esslingen gGmbH, Klinik Kirchheim, Akademisches Lehrkrankenhaus der Universität Tübingen, Eugenstr. 3, 73230, Kirchheim unter Teck, Deutschland
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18
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Sowa M, Trezzi B, Hiemann R, Schierack P, Grossmann K, Scholz J, Somma V, Sinico RA, Roggenbuck D, Radice A. Simultaneous comprehensive multiplex autoantibody analysis for rapidly progressive glomerulonephritis. Medicine (Baltimore) 2016; 95:e5225. [PMID: 27858870 PMCID: PMC5591118 DOI: 10.1097/md.0000000000005225] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Rapidly progressive glomerulonephritis (RPGN) is mainly caused by anti-glomerular basement membrane (GBM) antibody-mediated glomerulonephritis, immune-complex or anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitides and leads to rapid loss of renal function. Detection of ANCA and autoantibodies (autoAbs) to GBM and dsDNA enables early diagnosis and appropriate treatment of RPGN aiding in preventing end-stage renal disease.Determination of ANCA on neutrophils (ANCA) as well as autoAbs to myeloperoxidase (MPO-ANCA), proteinase 3 (PR3-ANCA), GBM, and dsDNA was performed by the novel multiplex CytoBead technology combining cell- and microbead-based autoAb analyses by automated indirect immunofluorescence (IIF). Forty patients with granulomatosis with polyangiitis (GPA), 48 with microscopic polyangiitis (MPA), 2 with eosinophilic GPA, 42 with systemic lupus erythematosus (SLE), 43 with Goodpasture syndrome (GPS), 57 with infectious diseases (INF), and 55 healthy subjects (HS) were analyzed and findings compared with classical single testing.The CytoBead assay revealed for GPA, MPA, GPS, and SLE the following diagnostic sensitivities and for HS and INF the corresponding specificities: PR3-ANCA, 85.0% and 100.0%; MPO-ANCA, 77.1% and 99.1%; anti-GBM autoAb, 88.4% and 96.4%; anti-dsDNA autoAb, 83.3% and 97.3%; ANCA, 91.1% and 99.1%, respectively. Agreement with classical enzyme-linked immunosorbent assay and IIF was very good for anti-GBM autoAb, MPO-ANCA, PR3-ANCA, and ANCA, respectively. Anti-dsDNA autoAb comparative analysis demonstrated fair agreement only and a significant difference (P = 0.0001).The CytoBead technology provides a unique multiplex reaction environment for simultaneous RPGN-specific autoAb testing. CytoBead RPGN assay is a promising alternative to time-consuming single parameter analysis and, thus, is well suited for emergency situations.
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Affiliation(s)
- Mandy Sowa
- Research and Development Department, GA Generic Assays GmbH, Dahlewitz/Berlin, Germany
- Correspondence: Mandy Sowa, Medipan GmbH, Ludwig-Erhard-Ring 3, 15827 Dahlewitz, Germany (e-mail: )
| | - Barbara Trezzi
- Clinical Immunology, San Carlo Borromeo Hospital, Milan, Italy
| | - Rico Hiemann
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg
| | - Peter Schierack
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg
| | - Kai Grossmann
- Research and Development Department, GA Generic Assays GmbH, Dahlewitz/Berlin, Germany
| | - Juliane Scholz
- Research and Development Department, GA Generic Assays GmbH, Dahlewitz/Berlin, Germany
| | - Valentina Somma
- Research and Development Department, Medipan GmbH, Dahlewitz/Berlin, Germany
| | - Renato Alberto Sinico
- Department of Medicine and Surgery, Università degli Studi di Milano - Bicocca (School of Medicine and Surgery), via Cadore, 48 - 20900 Monza (MB)
| | - Dirk Roggenbuck
- Research and Development Department, GA Generic Assays GmbH, Dahlewitz/Berlin, Germany
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg
| | - Antonella Radice
- Microbiology Institute, San Carlo Borromeo Hospital, Milan, Italy
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19
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Damoiseaux J, Csernok E, Rasmussen N, Moosig F, van Paassen P, Baslund B, Vermeersch P, Blockmans D, Cohen Tervaert JW, Bossuyt X. Detection of antineutrophil cytoplasmic antibodies (ANCAs): a multicentre European Vasculitis Study Group (EUVAS) evaluation of the value of indirect immunofluorescence (IIF) versus antigen-specific immunoassays. Ann Rheum Dis 2016; 76:647-653. [PMID: 27481830 DOI: 10.1136/annrheumdis-2016-209507] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 07/12/2016] [Indexed: 12/22/2022]
Abstract
OBJECTIVE This multicentre study was performed to evaluate the diagnostic accuracy of a wide spectrum of novel technologies nowadays available for detection of myeloperoxidase (MPO) and proteinase 3 (PR3)-antineutrophil cytoplasmic antibodies (ANCAs). METHODS Sera (obtained at the time of diagnosis) from 251 patients with ANCA-associated vasculitis (AAV), including granulomatosis with polyangiitis and microscopic polyangiitis, and from 924 disease controls were tested for the presence of cytoplasmic pattern/perinuclear pattern and atypical ANCA (A-ANCA) by indirect immunofluorescence (IIF) (at two sites) and for the presence of PR3-ANCA and MPO-ANCA by eight different immunoassays. RESULTS The area under the curve (AUC) of the receiver operating characteristic curve to discriminate AAV from controls was 0.923 (95% CI 0.902 to 0.944) and 0.843 (95% CI 0.814 to 0.871) for the two IIF methods. For the antigen-specific immunoassays, the AUC varied between 0.936 (95% CI 0.912 to 0.960) and 0.959 (95% CI 0.941 to 0.976), except for one immunoassay for which the AUC was 0.919 (95% CI 0.892 to 0.945). CONCLUSIONS Our comparison of various ANCA detection methods showed (i) large variability between the two IIF methods tested and (ii) a high diagnostic performance of PR3-ANCA and MPO-ANCA by immunoassay to discriminate AAV from disease controls. Consequently, dual IIF/antigen-specific immunoassay testing of each sample is not necessary for maximal diagnostic accuracy. These results indicate that the current international consensus on ANCA testing for AAV needs revision.
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Affiliation(s)
- Jan Damoiseaux
- Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Elena Csernok
- Department of Rheumatology and Immunology, Klinikum Bad Bramstedt, Bad Bramstedt, Germany
| | - Niels Rasmussen
- Department of Autoimmune Serology, Statens Seruminstitute, Copenhagen, Denmark
| | - Frank Moosig
- Rheumazentrum Schleswig-Holstein Mitte, Neumünster, Germany
| | - Pieter van Paassen
- Department of Internal Medicine, Section Nephrology and Immunology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Bo Baslund
- Department of Rheumatology, Rigshospitalet, Copenhagen, Denmark
| | - Pieter Vermeersch
- Clinical Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium.,Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Daniel Blockmans
- Clinical Department of General Internal Medicine, Research Department of Microbiology and Immunology, Laboratory of Clinical Infectious and Inflammatory Disorders, University Hospitals Leuven, Leuven, Belgium
| | | | - Xavier Bossuyt
- Department of Microbiology and Immunology, KU Leuven, Leuven, Belgium.,Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
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Csernok E, Damoiseaux J, Rasmussen N, Hellmich B, van Paassen P, Vermeersch P, Blockmans D, Cohen Tervaert JW, Bossuyt X. Evaluation of automated multi-parametric indirect immunofluorescence assays to detect anti-neutrophil cytoplasmic antibodies (ANCA) in granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA). Autoimmun Rev 2016; 15:736-41. [DOI: 10.1016/j.autrev.2016.03.010] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 03/03/2016] [Indexed: 01/03/2023]
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21
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Avery TY, Bons J, van Paassen P, Damoiseaux J. Diagnostic ANCA algorithms in daily clinical practice: evidence, experience, and effectiveness. Lupus 2016; 25:917-24. [DOI: 10.1177/0961203316640921] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Detection of antineutrophil cytoplasmic antibodies (ANCA) for ANCA-associated vasculitides (AAV) is based on indirect immunofluorescence (IIF) on ethanol-fixed neutrophils and reactivity toward myeloperoxidase (MPO) and proteinase 3 (PR3). According to the international consensus for ANCA testing, presence of ANCA should at least be screened for by IIF and, if positive, followed by antigen-specific immunoassays. Optimally, all samples are analyzed by both IIF and quantitative antigen-specific immunoassays. Since the establishment of this consensus many new technologies have become available and this has challenged the positioning of IIF in the testing algorithm for AAV. In the current paper, we summarize the novelties in ANCA diagnostics and discuss the possible implications of these developments for the different ANCA algorithms that are currently applied in routine diagnostic laboratories. Possible consequences of replacing ANCA assays by novel methods are illustrated by our data obtained in daily clinical practice. Eventually, it is questioned if there is a need to change the consensus, and if so, whether IIF can be discarded completely, or be used as a confirmation assay instead of a screening assay. Both alternative options require that ANCA requests for AAV can be separated from ANCA requests for gastrointestinal autoimmune diseases.
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Affiliation(s)
- T Y Avery
- Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, The Netherlands
| | - J Bons
- Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, The Netherlands
| | - P van Paassen
- Department of Internal Medicine, Maastricht University Medical Center, Maastricht, The Netherlands
| | - J Damoiseaux
- Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, The Netherlands
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Karlon WJ, Naides SJ, Crosson JT, Ansari MQ. Variability in Testing for Antineutrophil Cytoplasmic Antibodies: A Survey of Participants in the College of American Pathologists Proficiency Testing Program. Arch Pathol Lab Med 2016; 140:524-8. [PMID: 27232346 DOI: 10.5858/arpa.2015-0221-cp] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
CONTEXT -Variability in testing for antineutrophil cytoplasmic antibodies (ANCAs) contributes to confusion and controversy related to testing for vasculitis and other ANCA-associated diseases. OBJECTIVES -To survey laboratory testing practices regarding ANCA testing and to investigate differences in testing algorithms. DESIGN -Supplemental questions were sent to the 333 laboratories participating in the College of American Pathologists proficiency testing program for ANCA as part of the Special Immunology S2 Survey. RESULTS -A total of 315 laboratories submitted responses to the supplemental questions. Only 88 of 315 participants (28%) reported using a combination of indirect immunofluorescence (IFA) and enzyme immunoassay (EIA) techniques as recommended by current guidelines, with a few additional labs using IFA and multiplex bead assay as an acceptable alternative to EIA. Other labs reported using only IFA, EIA, or multiplex bead assays. CONCLUSIONS -A wide variety of testing algorithms are in use for ANCA testing despite evidence to suggest that a combination of IFA and EIA testing provides the most comprehensive information. Laboratories should inform clinicians clearly about testing practices and utility of testing in specific disease states.
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Affiliation(s)
- William J Karlon
- From the Department of Laboratory Medicine, University of California, San Francisco (Dr Karlon); Quest Diagnostics Nichols Institute, San Juan Capistrano, California (Dr Naides); the Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis (Dr Crosson); and the Department of Clinical Pathology, Cleveland Clinic, Cleveland, Ohio (Dr Ansari)
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Grossmann K, Röber N, Hiemann R, Rödiger S, Schierack P, Reinhold D, Laass MW, Conrad K, Roggenbuck D. Simultaneous detection of celiac disease-specific IgA antibodies and total IgA. AUTOIMMUNITY HIGHLIGHTS 2016; 7:2. [PMID: 26831868 PMCID: PMC4733812 DOI: 10.1007/s13317-016-0073-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 12/09/2015] [Indexed: 12/19/2022]
Abstract
Purpose Celiac disease (CD) serology requires analysis of tissue transglutaminase type-2 (TG2autoAbs), deamidated gliadin (DGAbs), and as reference endomysial autoantibodies (EmA). Total IgA assessment helps to determine IgA-deficient CD patients. The novel multiplex indirect immunofluorescence (IIF) technique CytoBead was used to develop the first quantitative one-step serological CD assay comprising both simultaneous IgA autoAb and total IgA testing. Methods CytoBead CeliAK detecting TG2autoAb, DGAb, EmA, and simultaneously total IgA uses fluorescent microparticles for antigen and antibody immobilization along with monkey-esophagus tissue sections on glass slides. The assay was interpreted visually by classical fluorescent microscopy and digital IIF using AKLIDES®. Overall, 380 samples (155 CD patients, 5 with IgA deficiency, 68 with cystic fibrosis, 59 with eye disease, 93 blood donors) were run for performance analysis. Data were compared with classical IgA autoAb analysis by ELISA and IIF. Results Comparing CD-specific IgA autoAb testing by CytoBead with classical IIF and ELISA, very good agreements for EmA, TG2autoAb, and DGAb were determined (Cohen’s κ = 0.98, 0.96, 0.85, respectively). The difference between multiplex and single testing revealed a significant difference for TG2autoAb testing only (McNemar, p = 0.0078). Four CD patients and 4 controls demonstrated TG2autoAb positivity by ELISA but were negative by CytoBead. Further, 140/155 (90.9 %) CD patients demonstrated TG2autoAb levels above ten times the upper normal and all five IgA-deficient samples IgA levels <0.2 g/L by CytoBead. Conclusions The novel multiplex CytoBead CeliAK enables simultaneous CD-specific autoAb and IgA deficiency analyses comparable with classical testing by single-parameter assays. Thus, comprehensive CD serology by CytoBead can alleviate the workload in routine laboratories. Electronic supplementary material The online version of this article (doi:10.1007/s13317-016-0073-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | - Nadja Röber
- Institute of Immunology, Medical Faculty, Technical University Dresden, Dresden, Germany
| | - Rico Hiemann
- Faculty of Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Großenhainer Str. 57, 01968, Senftenberg, Germany
| | - Stefan Rödiger
- Faculty of Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Großenhainer Str. 57, 01968, Senftenberg, Germany
| | - Peter Schierack
- Faculty of Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Großenhainer Str. 57, 01968, Senftenberg, Germany
| | - Dirk Reinhold
- Institute of Molecular and Clinical Immunology, Otto-von-Guericke-University, Magdeburg, Germany
| | - Martin W Laass
- Children's Hospital, Medical Faculty Carl Gustav Carus, Technical University Dresden, Dresden, Germany
| | - Karsten Conrad
- Institute of Immunology, Medical Faculty, Technical University Dresden, Dresden, Germany
| | - Dirk Roggenbuck
- GA Generic Assays GmbH, Dahlewitz, Germany. .,Faculty of Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Großenhainer Str. 57, 01968, Senftenberg, Germany.
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Villalta D, Mytilinaiou MG, Elsner M, Hentschel C, Cuccato J, Somma V, Schierack P, Roggenbuck D, Bogdanos DP. Autoantibodies to asialoglycoprotein receptor (ASGPR) in patients with autoimmune liver diseases. Clin Chim Acta 2015. [PMID: 26220739 DOI: 10.1016/j.cca.2015.07.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND The liver asialoglycoprotein receptor (ASGPR) is the only organ-specific autoantigenic target in autoimmune hepatitis (AIH) patients and corresponding autoantibodies (Abs) have been suggested aiding in the serology of autoimmune liver diseases (ALD). METHODS A novel enzyme-linked immunosorbent assay (ELISA) employing purified rabbit ASGPR was used to detect ASGPR Abs in patients with ALD and controls. ASGPR Ab was determined in sera from 172 patients with AIH type 1, AIH type 2 (n=42), primary biliary cirrhosis (PBC) (n=113), cryptogenic liver disease (n=30), toxic liver disease (n=11), primary sclerosing cholangitis (PSC) (n=27), HCV infection (n=25), non-alcoholic steatohepatitis (n=43) and 100 blood donors. ASGPR Ab positivity was compared with AIH-related Abs (ANA, ASMA, Abs to LKM-1, LC-1, and SLA/LP) in patients with AIH. RESULTS Patients with AIH-1 and AIH-2 demonstrated an ASGPR Ab prevalence of 29.1% and 16.7%, respectively. ASGPR Ab positivity in patients with AIH-1 and AIH-2 was not significantly different to those in patients with PSC and HCV (p>0.05, respectively). ASGPR Ab levels in all study cohorts were significantly different with the highest medians in patients with AIH, PSC, and HCV infection (p<0.0001). ASGPR Ab can be found as only AIH-specific Ab determined by LIA and ELISA in 24.4% of AIH patients (48/197). CONCLUSIONS The novel ASGPR Ab ELISA is a specific diagnostic tool for ASGPR Ab detection in AIH. In addition to AIH, patients with PSC can demonstrate elevated ASGPR Ab amongst those with ALD suggesting a tolerance break to ASGPR in PSC.
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Affiliation(s)
- Danilo Villalta
- Allergologia e Immunologia Clinica, A.O. S. Maria degli Angeli, Pordenone, Italy
| | - Maria G Mytilinaiou
- Division of Transplantation Immunology and Mucosal Biology, King's College London School of Medicine at King's College Hospital, London, UK
| | | | | | | | | | - Peter Schierack
- Faculty of Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany
| | - Dirk Roggenbuck
- GA Generic Assays GmbH, Dahlewitz, Germany; Faculty of Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany.
| | - Dimitrios P Bogdanos
- Division of Transplantation Immunology and Mucosal Biology, King's College London School of Medicine at King's College Hospital, London, UK; Department or Rheumatology, School of Health Sciences, University of Thessaly, Larissa, Greece
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Automation, consolidation, and integration in autoimmune diagnostics. AUTOIMMUNITY HIGHLIGHTS 2015; 6:1-6. [PMID: 26138781 PMCID: PMC4536237 DOI: 10.1007/s13317-015-0067-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 06/01/2015] [Indexed: 12/18/2022]
Abstract
Over the past two decades, we have witnessed an extraordinary change in autoimmune diagnostics, characterized by the progressive evolution of analytical technologies, the availability of new tests, and the explosive growth of molecular biology and proteomics. Aside from these huge improvements, organizational changes have also occurred which brought about a more modern vision of the autoimmune laboratory. The introduction of automation (for harmonization of testing, reduction of human error, reduction of handling steps, increase of productivity, decrease of turnaround time, improvement of safety), consolidation (combining different analytical technologies or strategies on one instrument or on one group of connected instruments) and integration (linking analytical instruments or group of instruments with pre- and post-analytical devices) opened a new era in immunodiagnostics. In this article, we review the most important changes that have occurred in autoimmune diagnostics and present some models related to the introduction of automation in the autoimmunology laboratory, such as automated indirect immunofluorescence and changes in the two-step strategy for detection of autoantibodies; automated monoplex immunoassays and reduction of turnaround time; and automated multiplex immunoassays for autoantibody profiling.
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Sowa M, Grossmann K, Knütter I, Hiemann R, Röber N, Anderer U, Csernok E, Bogdanos DP, Borghi MO, Meroni PL, Schierack P, Reinhold D, Conrad K, Roggenbuck D. Correction: Simultaneous Automated Screening and Confirmatory Testing for Vasculitis-Specific ANCA. PLoS One 2015; 10:e0127933. [PMID: 25970179 PMCID: PMC4430479 DOI: 10.1371/journal.pone.0127933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Ghanadan A, Saghazadeh A, Jahanzad I, Rezaei N. Clinical aspects of indirect immunofluorescence for autoimmune diseases. Expert Rev Clin Immunol 2015; 11:597-616. [PMID: 25786676 DOI: 10.1586/1744666x.2015.1027152] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Because the most common term used in conversations considering autoimmunity is autoantibodies, it is well-expected that the indirect immunofluorescence assay, which detects antibodies directed against various antigens, is one of our most impressive techniques for investigating autoimmune diseases (AIDs). Roughly speaking, the current literature corroborates that this immunopathologic investigation means that autoantibodies detection makes a considerable contribution to both diagnostic and prognostic aspects of AIDs in the clinical setting. However, it varies between different AIDs, autoantibodies, ethnicities or detection methodologies. Directly focusing on the indirect immunofluorescence assay, we present evidence to support this multidimensional variation regarding the subject via reviewing briefly the best-investigated autoantibodies in the well-documented AIDs, including vasculitis, inflammatory bowel disease, scleroderma, autoimmune hepatitis, primary biliary cirrhosis, systemic lupus erythematosus and Sjögren's syndrome.
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Affiliation(s)
- Alireza Ghanadan
- Department of Pathology, Imam Khomeini Complex Hospital, School of Medicine, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
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28
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Correction: simultaneous automated screening and confirmatory testing for vasculitis-specific ANCA. PLoS One 2015; 10:e0120626. [PMID: 25763594 PMCID: PMC4357523 DOI: 10.1371/journal.pone.0120626] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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29
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Toubi E. Diagnostics and environmental factors. Immunol Res 2015; 61:104-6. [PMID: 25550084 DOI: 10.1007/s12026-014-8611-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Elias Toubi
- Division of Allergy and Clinical Immunology, Faculty of Medicine, Technion, Haifa, Israel,
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