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Brunetta E, Ramponi G, Folci M, De Santis M, Morenghi E, Vanni E, Bredi E, Furlan R, Angelini C, Selmi C. Serum ANCA and Overall Mortality: A 10-Year Retrospective Cohort Study on 1,024 Italian Subjects. Front Immunol 2021; 12:714174. [PMID: 34566970 PMCID: PMC8461098 DOI: 10.3389/fimmu.2021.714174] [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: 05/24/2021] [Accepted: 08/17/2021] [Indexed: 11/14/2022] Open
Abstract
Background Antineutrophil cytoplasmic antibodies (ANCA) are primarily involved in the pathogenesis of ANCA-associated vasculitides (AAV). However, ANCA may also be present in healthy subjects and in patients with autoimmune disorders different from AAV. We hypothesized that serum ANCA are associated with a worse prognosis in disorders other than AAV. Objective We investigated the association between the overall survival and the presence of serum ANCA in 1,024 Italian subjects with various testing indications in a 10-year interval. Methods In this retrospective cohort study, a population of 6,285 patients (many of whom were subsequently excluded due to our criteria) who tested for ANCA at a single center in 10 years was considered, and life status and comorbidities of subjects were collected. We compared the overall survival of ANCA-positive and ANCA-negative patients by means of Kaplan-Meier curves, while a multivariable adjusted Cox regression was used to evaluate the association between the ANCA status and the outcome (death) in terms of hazard ratios (HR) with 95% confidence intervals (CI). Results The positivity of perinuclear ANCA (pANCA) increased significantly mortality (HR, 1.60; 95% CI, 1.10–2.32), while cytoplasmic ANCA (cANCA) positivity failed to show a significant association (HR, 1.43; 95% CI, 0.77–2.68). The increased mortality rate was observed for both pANCA and cANCA in patients suffering from rheumatic disorders. No association was found between mortality and anti-MPO (HR, 0.63; 95% CI, 0.20–2.00) or anti-PR3 (HR, 0.98; 95% CI, 0.24–3.96) after adjusting for confounders. Conclusions Serum pANCA and cANCA are independent negative prognostic factors in patients with concurrent autoimmune diseases.
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Affiliation(s)
- Enrico Brunetta
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | | | - Marco Folci
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Maria De Santis
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy.,Unit of Rheumatology and Clinical Immunology, IRCCS Humanitas Research Hospital, Rozzano, Italy
| | - Emanuela Morenghi
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Elena Vanni
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Elena Bredi
- IRCCS Humanitas Research Hospital, Rozzano, Italy
| | - Raffaello Furlan
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Claudio Angelini
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Carlo Selmi
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy.,Unit of Rheumatology and Clinical Immunology, IRCCS Humanitas Research Hospital, Rozzano, Italy
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Krischock L, Pannila P, Kennedy SE. Levamisole and ANCA positivity in childhood nephrotic syndrome. Pediatr Nephrol 2021; 36:1795-1802. [PMID: 33484340 DOI: 10.1007/s00467-020-04915-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/03/2020] [Accepted: 12/31/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND This study aimed to determine the prevalence of ANCA positivity in children managed with levamisole as a steroid-sparing agent for nephrotic syndrome (NS). METHODS Medical records of children with steroid-sensitive NS managed with levamisole therapy at Sydney Children's Hospital between 1/1/2000 and 31/12/2018 were retrospectively reviewed. Main outcome measure was side effects of levamisole therapy including ANCA positivity. RESULTS Seventy-one children, median age 3 years and 1 month (IQR 29-68 months) at first presentation, were subsequently managed with levamisole. 60.6% were male and 65% Caucasian. 47.9% had frequently relapsing (FR)NS and 52.1% steroid-dependent (SD)NS. Overall, there was a median reduction in relapses from 3 (IQR 1-5) to 0.4 relapses (IQR 0-1) per year after levamisole was commenced. Levamisole was successful in preventing relapse in 19 (29%) patients and was used for median 24 (22 to 25) months. Levamisole was discontinued due to relapse in 25 patients (38%) after median 12 (5-28) months. Side effects occurred in 28 patients (42.4%); the most common side effect was ANCA positivity in 12 patients. In eleven of these patients, levamisole was discontinued; in one patient, low-level titres were documented and spontaneously resolved without cessation of levamisole. Two patients developed ANCA-associated vasculitis. CONCLUSION ANCA positivity is a common side effect of levamisole and was seen in 18.2% of our patients. Monitoring is required to determine side effects including ANCA positivity and treatment modified accordingly.
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Affiliation(s)
- Leah Krischock
- Department of Nephrology, Sydney Children's Hospital, Randwick, NSW, Australia. .,School of Women's and Children's Health, UNSW Medicine, University of New South Wales, Sydney, NSW, Australia.
| | - Pasan Pannila
- School of Women's and Children's Health, UNSW Medicine, University of New South Wales, Sydney, NSW, Australia
| | - Sean E Kennedy
- Department of Nephrology, Sydney Children's Hospital, Randwick, NSW, Australia.,School of Women's and Children's Health, UNSW Medicine, University of New South Wales, Sydney, NSW, Australia
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Roitsch S, Gößwein S, Neurath MF, Leppkes M. Detection by flow cytometry of anti-neutrophil cytoplasmic antibodies in a novel approach based on neutrophil extracellular traps. Autoimmunity 2019; 51:288-296. [PMID: 30994385 DOI: 10.1080/08916934.2018.1527317] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Anti-neutrophil-cytoplasmic antibodies (ANCA) are auto-antibodies directed against components of neutrophil granulocytes and may be found in various inflammatory conditions, like small-vessel vasculitis or ulcerative colitis (UC). Routine ANCA screening is performed on ethanol-fixed neutrophils using indirect immunofluorescence technique. Yet, how neutrophil granule proteins become available to immunologic presentation is a matter of debate. In recent years, various studies have shown that neutrophils are able to extrude their chromatin decorated with granular proteins as neutrophil extracelullar traps (NETs). AIM We hypothesized that (I) ANCA immunoreactivity may be found on NETs and (II) NETs may serve as a useful tool in a novel approach for ANCA detection. METHODS Sera from patients suffering from either ANCA-associated vasculitis (n = 10), UC (n = 30) or sera from patients without diagnosed ANCA-associated diseases (n = 20), respectively, were subjected to indirect immunofluorescence and a newly developed method to detect ANCA by flow cytometry employing microbead technology. RESULTS ANCA-related immunofluorescence was readily detectable on ethanol-fixed NETs, establishing NETs as a structure carrying ANCA target antigens. Moreover, we observed that neutrophils form NETs in response to microbeads and stick to the surface of these beads. Using these NET-coated microbeads in flow cytometry, we were capable of reliably detecting p-ANCA, c-ANCA, and a-ANCA in tested patient sera. UC-related complex DNase-1-sensitive ANCA (NET-ANCA) antigens were also detected on NET-coated microbeads. CONCLUSION NET-coated microbeads may be commercially developed as a novel tool for automated ANCA screening assays using flow cytometry.
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Affiliation(s)
- Stefan Roitsch
- a Department of Internal Medicine 1 - Gastroenterology, Pneumology and Endocrinology , Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Universitätsklinikum Erlangen , Erlangen , Germany
| | - Stefanie Gößwein
- a Department of Internal Medicine 1 - Gastroenterology, Pneumology and Endocrinology , Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Universitätsklinikum Erlangen , Erlangen , Germany
| | - Markus F Neurath
- a Department of Internal Medicine 1 - Gastroenterology, Pneumology and Endocrinology , Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Universitätsklinikum Erlangen , Erlangen , Germany
| | - Moritz Leppkes
- a Department of Internal Medicine 1 - Gastroenterology, Pneumology and Endocrinology , Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Universitätsklinikum Erlangen , Erlangen , Germany
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Prevalence and Clinical Significance of Antineutrophil Cytoplasmic Antibodies in North American Patients With Idiopathic Pulmonary Fibrosis. Chest 2019; 156:715-723. [PMID: 31181198 DOI: 10.1016/j.chest.2019.05.014] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 04/01/2019] [Accepted: 05/03/2019] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND Antineutrophil cytoplasmic antibodies (ANCAs) have been reported to occur in 7% to 10% of patients with idiopathic pulmonary fibrosis (IPF), but their clinical relevance remains unclear. The aim of this study was to estimate the prevalence of ANCAs in a North American population with IPF and evaluate their clinical significance. METHODS This was a retrospective study of two independent cohorts of patients diagnosed with IPF at the University of California San Francisco (discovery cohort) and the University of Chicago (replication cohort). Myeloperoxidase (MPO) and proteinase 3 (PR3) ANCAs were measured in all patients. Prevalence and associations of ANCAs with clinical characteristics and transplant-free survival were evaluated. RESULTS A total of 14 of 353 (4.0%; 95% CI, 2.2-6.5) and 20 of 392 (5.1%; 95% CI, 3.1-7.8) patients with IPF were positive for ANCAs at the time of diagnosis in the discovery and replication cohorts, respectively. Among those positive for MPO antibodies, two of six (33%) in the discovery cohort and three of 12 (25%) in the replication cohort developed vasculitis. None of the patients who were PR3-positive developed vasculitis. Patients who were ANCA-positive were more likely to be women than patients who were ANCA-negative, and were more likely to have some ground-glass opacities on CT scan. In the combined cohort of 745 patients, median transplant-free survival was not significantly different in patients who were ANCA-positive vs ANCA-negative (P = .57). CONCLUSIONS ANCA positivity is uncommon in North American patients with IPF and not associated with baseline disease severity or transplant-free survival; however, a significant proportion of patients who are MPO-positive with IPF develop clinical vasculitis.
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Majumder PD, Sudharshan S, George AE, Ganesh SK, Biswas J. Antineutrophil cytoplasmic antibody-positive scleritis: Clinical profile of patients from a tuberculosis-endemic region. Indian J Ophthalmol 2018; 66:1587-1591. [PMID: 30355867 PMCID: PMC6213669 DOI: 10.4103/ijo.ijo_777_18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Purpose: To report the clinical profile of a series of antineutrophil cytoplasmic antibody (ANCA)-associated scleritis in Indian population. Methods: We conducted a retrospective review of medical records of 33 eyes of 26 consecutive patients with scleritis, who tested positive for either antibody to proteinase 3 [anti-PR3/cytoplasmic antineutrophil cytoplasmic antibody (cANCA)] or myeloperoxidase [anti-MPO/perinuclear anti-neutrophil cytoplasmic antibody (pANCA)] between 2006 and 2015. Results: The mean age at presentation was 54.1 (11.1) years and 61.5% of the patients were female. Underlying systemic disorder was found in 46.2% of patients and includes granulomatosis with polyangitis (30.8%) and tuberculosis (15.4%). Necrotizing scleritis (48.5%) was the most common scleritis observed, followed by diffuse anterior scleritis (42.4%). Positive cANCA was found in 65.4% of patients and 34.6% was found positive for pANCA. Four of the six patients with positive Mantoux test were started on anti-tuberculosis treatment (ATT) by pulmonologist. Cyclophosphamide was the most common immunosuppressive and 11.5% of the patients required combination of two immunosuppressives. Seventeen eyes developed cataract and four eyes required patch graft. Female gender was more frequently associated with pANCA-associated scleritis than cANCA (P = 0.037). Incidence of necrotizing scleritis was higher in patients with positive cANCA, but this difference was not statistically significant (P = 0.806). cANCA-positive patients had statistically significant higher association with systemic rheumatic diseases (P = 0.021). Conclusion: Necrotizing scleritis is the most common subtype of scleritis in ANCA-positive individuals and even in the absence of systemic involvement. All patients with ANCA positivity should be thoroughly screened to rule out any evidence of tuberculosis, especially in tuberculosis-endemic region before planning aggressive immunomodulatory therapy.
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Affiliation(s)
| | | | | | - Sudha K Ganesh
- Departments of Uvea, Sankara Nethralaya, Chennai, Tamil Nadu, India
| | - Jyotirmay Biswas
- Departments of Uvea, Sankara Nethralaya, Chennai, Tamil Nadu, India
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Ebrahimiadib N, Ma L, Modjtahedi BS, Davoudi S, Rahmani S, Syeda S, Stephenson A, Foster CS. Atypical Perinuclear Anti-Neutrophil Cytoplasmic Antibodies in Ocular Inflammatory Diseases. Ocul Immunol Inflamm 2018; 27:937-941. [DOI: 10.1080/09273948.2018.1502787] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Nazanin Ebrahimiadib
- Massachusetts Eye Research and Surgery Institution, Waltham, Massachusetts, USA
- Ocular Immunology and Uveitis Foundation, Waltham, Massachusetts, USA
| | - Lina Ma
- Massachusetts Eye Research and Surgery Institution, Waltham, Massachusetts, USA
- Ocular Immunology and Uveitis Foundation, Waltham, Massachusetts, USA
| | - Bobeck S. Modjtahedi
- Department of Ophthalmology, Southern California Permanente Medical Group, Baldwin Park, California, USA
| | - Samaneh Davoudi
- Department of Ophthalmology, University of Florida, Gainesville, Florida, USA
| | - Safa Rahmani
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
| | - Sarah Syeda
- Massachusetts Eye Research and Surgery Institution, Waltham, Massachusetts, USA
- Ocular Immunology and Uveitis Foundation, Waltham, Massachusetts, USA
| | - Andrew Stephenson
- Massachusetts Eye Research and Surgery Institution, Waltham, Massachusetts, USA
- Ocular Immunology and Uveitis Foundation, Waltham, Massachusetts, USA
| | - Charles Stephen Foster
- Massachusetts Eye Research and Surgery Institution, Waltham, Massachusetts, USA
- Ocular Immunology and Uveitis Foundation, Waltham, Massachusetts, USA
- Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
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7
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Rao DA, Wei K, Merola JF, O'Brien WR, Takvorian SU, Dellaripa PF, Schur PH. Myeloperoxidase-antineutrophil Cytoplasmic Antibodies (MPO-ANCA) and Proteinase 3-ANCA without Immunofluorescent ANCA Found by Routine Clinical Testing. J Rheumatol 2015; 42:847-52. [PMID: 25834211 DOI: 10.3899/jrheum.140941] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/23/2015] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Concurrent testing for serum antineutrophil cytoplasmic antibodies (ANCA) by indirect immunofluorescence (IF) and by antiproteinase 3 (PR3)/antimyeloperoxidase (MPO) antibody assays may identify patients with PR3-ANCA or MPO-ANCA despite a negative IF (IF-negative MPO/PR3-positive); however, the significance of this result is not clear. We sought to determine whether IF-negative, MPO/PR3-positive results identified any cases of clinically meaningful systemic vasculitis at our institution. METHODS We conducted a retrospective chart review of all IF-negative, MPO/PR3-positive patients identified at our institution over a 2-year period. RESULTS Of the 2345 samples tested over 2 years, 1998 were IF-negative. Among these IF-negative samples, 49 samples (2.5%) derived from 38 patients tested positive for MPO-ANCA or PR3-ANCA. Only 1 IF-negative, MPO/PR3-positive patient was subsequently diagnosed with ANCA-associated vasculitis (AAV). Eleven IF-negative, MPO/PR3-positive patients (29%) had been previously diagnosed and treated for AAV, all with positive IF and antibody tests prior to treatment. Four patients had evidence of cutaneous vasculitis not attributed to AAV, while several of the remaining IF-negative, MPO/PR3-positive patients had other immunologic disorders, including systemic lupus erythematosus (5 patients) and inflammatory bowel disease (3 patients). CONCLUSION In this real-life cohort assayed simultaneously by IF and multiplexed bead assays, the detection of MPO-ANCA or PR3-ANCA without a positive IF rarely led to a new diagnosis of systemic vasculitis, and was more likely to occur in the context of a non-vasculitic inflammatory condition. Our results suggest that concurrent IF and MPO/PR3 testing may be of limited use in preventing a missed diagnosis of new-onset AAV.
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Affiliation(s)
- Deepak A Rao
- From the Division of Rheumatology, Immunology, Allergy, Brigham and Women's Hospital; Harvard Medical School, Boston, Massachusetts, USA.D.A. Rao, MD, PhD, Fellow in Rheumatology; K. Wei, MD, PhD, Fellow in Rheumatology; W.R. O'Brien, Fellow in Rheumatology; S.U. Takvorian, MD, Resident in Internal Medicine; P.F. Dellaripa, MD, Assistant Professor of Medicine; P.H. Schur, MD, Professor of Medicine, Brigham and Women's Hospital; J.F. Merola, MD, Instructor, Harvard Medical School
| | - Kevin Wei
- From the Division of Rheumatology, Immunology, Allergy, Brigham and Women's Hospital; Harvard Medical School, Boston, Massachusetts, USA.D.A. Rao, MD, PhD, Fellow in Rheumatology; K. Wei, MD, PhD, Fellow in Rheumatology; W.R. O'Brien, Fellow in Rheumatology; S.U. Takvorian, MD, Resident in Internal Medicine; P.F. Dellaripa, MD, Assistant Professor of Medicine; P.H. Schur, MD, Professor of Medicine, Brigham and Women's Hospital; J.F. Merola, MD, Instructor, Harvard Medical School
| | - Joseph F Merola
- From the Division of Rheumatology, Immunology, Allergy, Brigham and Women's Hospital; Harvard Medical School, Boston, Massachusetts, USA.D.A. Rao, MD, PhD, Fellow in Rheumatology; K. Wei, MD, PhD, Fellow in Rheumatology; W.R. O'Brien, Fellow in Rheumatology; S.U. Takvorian, MD, Resident in Internal Medicine; P.F. Dellaripa, MD, Assistant Professor of Medicine; P.H. Schur, MD, Professor of Medicine, Brigham and Women's Hospital; J.F. Merola, MD, Instructor, Harvard Medical School
| | - William R O'Brien
- From the Division of Rheumatology, Immunology, Allergy, Brigham and Women's Hospital; Harvard Medical School, Boston, Massachusetts, USA.D.A. Rao, MD, PhD, Fellow in Rheumatology; K. Wei, MD, PhD, Fellow in Rheumatology; W.R. O'Brien, Fellow in Rheumatology; S.U. Takvorian, MD, Resident in Internal Medicine; P.F. Dellaripa, MD, Assistant Professor of Medicine; P.H. Schur, MD, Professor of Medicine, Brigham and Women's Hospital; J.F. Merola, MD, Instructor, Harvard Medical School
| | - Samuel U Takvorian
- From the Division of Rheumatology, Immunology, Allergy, Brigham and Women's Hospital; Harvard Medical School, Boston, Massachusetts, USA.D.A. Rao, MD, PhD, Fellow in Rheumatology; K. Wei, MD, PhD, Fellow in Rheumatology; W.R. O'Brien, Fellow in Rheumatology; S.U. Takvorian, MD, Resident in Internal Medicine; P.F. Dellaripa, MD, Assistant Professor of Medicine; P.H. Schur, MD, Professor of Medicine, Brigham and Women's Hospital; J.F. Merola, MD, Instructor, Harvard Medical School
| | - Paul F Dellaripa
- From the Division of Rheumatology, Immunology, Allergy, Brigham and Women's Hospital; Harvard Medical School, Boston, Massachusetts, USA.D.A. Rao, MD, PhD, Fellow in Rheumatology; K. Wei, MD, PhD, Fellow in Rheumatology; W.R. O'Brien, Fellow in Rheumatology; S.U. Takvorian, MD, Resident in Internal Medicine; P.F. Dellaripa, MD, Assistant Professor of Medicine; P.H. Schur, MD, Professor of Medicine, Brigham and Women's Hospital; J.F. Merola, MD, Instructor, Harvard Medical School.
| | - Peter H Schur
- From the Division of Rheumatology, Immunology, Allergy, Brigham and Women's Hospital; Harvard Medical School, Boston, Massachusetts, USA.D.A. Rao, MD, PhD, Fellow in Rheumatology; K. Wei, MD, PhD, Fellow in Rheumatology; W.R. O'Brien, Fellow in Rheumatology; S.U. Takvorian, MD, Resident in Internal Medicine; P.F. Dellaripa, MD, Assistant Professor of Medicine; P.H. Schur, MD, Professor of Medicine, Brigham and Women's Hospital; J.F. Merola, MD, Instructor, Harvard Medical School.
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Kagiyama N, Takayanagi N, Kanauchi T, Ishiguro T, Yanagisawa T, Sugita Y. Antineutrophil cytoplasmic antibody-positive conversion and microscopic polyangiitis development in patients with idiopathic pulmonary fibrosis. BMJ Open Respir Res 2015; 2:e000058. [PMID: 25593704 PMCID: PMC4289718 DOI: 10.1136/bmjresp-2014-000058] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 11/22/2014] [Accepted: 12/01/2014] [Indexed: 12/22/2022] Open
Abstract
Background Increasing evidence indicates that antineutrophil cytoplasmic antibody (ANCA)-positive conversion occurs in patients initially diagnosed with idiopathic pulmonary fibrosis (IPF) and as a result, some of these patients develop microscopic polyangiitis (MPA). However, the incidence density of these patients is not well known. Objectives To explore the incidence of ANCA-positive conversion and development of MPA during the disease course in patients with IPF and to evaluate whether corticosteroid therapy reduces MPA development in patients with IPF with myeloperoxidase (MPO)-ANCA positivity at diagnosis or who later acquire MPO-ANCA positivity. Methods We retrospectively analysed the medical records of 504 Asian patients with IPF treated at our institution in Saitama, Japan. Results Of the 504 patients with IPF, 20 (4.0%) had MPO-ANCA and 16 (3.2%) had PR-3-ANCA when first evaluated. In 264 of 504 patients with IPF, ANCA was measured repeatedly and seroconversion to MPO-ANCA and PR3-ANCA occurred in 15 (5.7%) and 14 (5.3%) patients, respectively, and 9 of 35 patients who were either MPO-ANCA positive at IPF diagnosis or who subsequently seroconverted developed MPA. None of the nine patients who developed MPA had been previously treated with steroids. The incidence of MPA tended to be lower in patients treated than not treated with corticosteroids although this was not statistically significant. Conclusions Some patients with IPF with MPO-ANCA positivity at IPF diagnosis or with MPO-ANCA-positive conversion during follow-up developed MPA. Clinical trials to determine whether corticosteroid therapy can reduce MPA development and prolong survival in MPO-ANCA-positive patients with IPF should be considered.
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Affiliation(s)
- Naho Kagiyama
- Department of Respiratory Medicine , Saitama Cardiovascular and Respiratory Center , Saitama , Japan
| | - Noboru Takayanagi
- Department of Respiratory Medicine , Saitama Cardiovascular and Respiratory Center , Saitama , Japan
| | - Tetsu Kanauchi
- Department of Radiology , Saitama Cardiovascular and Respiratory Center , Saitama , Japan
| | - Takashi Ishiguro
- Department of Respiratory Medicine , Saitama Cardiovascular and Respiratory Center , Saitama , Japan
| | - Tsutomu Yanagisawa
- Department of Respiratory Medicine , Saitama Cardiovascular and Respiratory Center , Saitama , Japan
| | - Yutaka Sugita
- Department of Respiratory Medicine , Saitama Cardiovascular and Respiratory Center , Saitama , Japan
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Simultaneous automated screening and confirmatory testing for vasculitis-specific ANCA. PLoS One 2014; 9:e107743. [PMID: 25225805 PMCID: PMC4166465 DOI: 10.1371/journal.pone.0107743] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 08/14/2014] [Indexed: 11/19/2022] Open
Abstract
Anti-neutrophil cytoplasmic antibodies (ANCA) are the serological hallmark of small vessel vasculitis, so called ANCA-associated vasculitis. The international consensus requires testing by indirect immunofluorescence (IIF) on human ethanol-fixed neutrophils (ethN) as screening followed by confirmation with enzyme-linked immunosorbent assays (ELISAs). This study evaluates the combination of cell- and microbead-based digital IIF analysis of ANCA in one reaction environment by the novel multiplexing CytoBead technology for simultaneous screening and confirmatory ANCA testing. Sera of 592 individuals including 118 patients with ANCA-associated vasculitis, 133 with rheumatoid arthritis, 49 with infectious diseases, 77 with inflammatory bowel syndrome, 20 with autoimmune liver diseases, 70 with primary sclerosing cholangitis and 125 blood donors were tested for cytoplasmic ANCA (C-ANCA) and perinuclear ANCA (P-ANCA) by classical IIF and ANCA to proteinase 3 (PR3) and myeloperoxidase (MPO) by ELISA. These findings were compared to respective ANCA results determined by automated multiplex CytoBead technology using ethN and antigen-coated microbeads for microbead immunoassays. There was a good agreement for PR3- and MPO-ANCA and a very good one for P-ANCA and C-ANCA by classical and multiplex analysis (Cohen's kappa [κ] = 0.775, 0.720, 0.876, 0.820, respectively). The differences between classical testing and CytoBead analysis were not significant for PR3-ANCA, P-ANCA, and C-ANCA (p<0.05, respectively). The prevalence of confirmed positive ANCA findings by classical testing (IIF and ELISA) compared with multiplex CytoBead analysis (IIF and microbead immunoassay positive) resulted in a very good agreement (κ = 0.831) with no significant difference of both methods (p = 0.735). Automated endpoint-ANCA titer detection in one dilution demonstrated a very good agreement with classical analysis requiring dilution of samples (κ = 0.985). Multiplexing by CytoBead technology can be employed for simultaneous screening and quantitative confirmation of ANCA. This novel technique provides fast and cost-effective ANCA analysis by automated digital IIF for the first time.
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Novel clinical and diagnostic aspects of antineutrophil cytoplasmic antibodies. J Immunol Res 2014; 2014:185416. [PMID: 24995343 PMCID: PMC4068101 DOI: 10.1155/2014/185416] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 03/06/2014] [Indexed: 12/18/2022] Open
Abstract
Antineutrophil cytoplasmic antibodies (ANCA) are the serological hallmark of some idiopathic systemic vasculitides. Besides the investigation of ANCA-associated vasculitis (AAV) and constant effort for a standardized nomenclature and classification of the AAV, a main focus of research during the last few years has been to constantly improve the performance of enzyme immunoassays. With the latest so called third generation ELISA, this goal seemed to be fulfilled. The International Consensus Statement on Testing and Reporting of ANCA gave recommendations for standardized strategies for the serological diagnosis of ANCA. New developments now target the system immanent drawbacks of the respective diagnostic methods, be it the need for batching and the long time to result for ELISA, or the high likelihood of error and subjectivity of indirect immunofluorescence (IIF). Random access technology and multiplexing for solid phase assays as well as digital imaging for IIF are tools which may help to expedite and simplify routine diagnostics in the lab and in emergency settings. Recent findings indicate that PR3-ANCA have clinical utility beyond the diagnosis of AAV. PR3-ANCA can also serve as an aid for the differentiation between ulcerative colitis (UC) and Crohn's disease (CrD) and the stratification of UC patients. This review provides a detailed review of what is known about ANCA and highlights the latest research and state-of-the-art developments in this area.
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Knütter I, Hiemann R, Brumma T, Büttner T, Großmann K, Cusini M, Pregnolato F, Borghi MO, Anderer U, Conrad K, Reinhold D, Roggenbuck D, Csernok E. Automated interpretation of ANCA patterns - a new approach in the serology of ANCA-associated vasculitis. Arthritis Res Ther 2012; 14:R271. [PMID: 23241527 PMCID: PMC3674631 DOI: 10.1186/ar4119] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Accepted: 12/11/2012] [Indexed: 12/19/2022] Open
Abstract
Introduction Indirect immunofluorescence (IIF) employing ethanol-fixed neutrophils (ethN) is still the method of choice for assessing antineutrophil cytoplasmic antibodies (ANCA) in ANCA-associated vasculitides (AAV). However, conventional fluorescence microscopy is subjective and prone to high variability. The objective of this study was to evaluate novel pattern recognition algorithms for the standardized automated interpretation of ANCA patterns. Methods Seventy ANCA-positive samples (20 antimyeloperoxidase ANCA, 50 antiproteinase3 ANCA) and 100 controls from healthy individuals analyzed on ethN and formalin-fixed neutrophils (formN) by IIF were used as a 'training set' for the development of pattern recognition algorithms. Sera from 342 patients ('test set') with AAV and other systemic rheumatic and infectious diseases were tested for ANCA patterns using the novel pattern recognition algorithms and conventional fluorescence microscopy. Results Interpretation software employing pattern recognition algorithms was developed enabling positive/negative discrimination and classification of cytoplasmic ANCA (C-ANCA) and perinuclear ANCA (P-ANCA). Comparison of visual reading of the 'test set' samples with automated interpretation revealed Cohen's kappa (κ) values of 0.955 on ethN and 0.929 on formN for positive/negative discrimination. Analysis of the 'test set' with regard to the discrimination between C-ANCA and P-ANCA patterns showed a high agreement for ethN (κ = 0.746) and formN (κ = 0.847). There was no significant difference between visual and automated interpretation regarding positive/negative discrimination on ethN and formN, as well as ANCA pattern recognition (P > 0.05, respectively). Conclusions Pattern recognition algorithms can assist in the automated interpretation of ANCA IIF. Automated reading of ethN and formN IIF patterns demonstrated high consistency with visual ANCA assessment.
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Autoimmunity in Rheumatic Diseases Is Induced by Microbial Infections via Crossreactivity or Molecular Mimicry. Autoimmune Dis 2012; 2012:539282. [PMID: 22454761 PMCID: PMC3290812 DOI: 10.1155/2012/539282] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Accepted: 11/01/2011] [Indexed: 12/12/2022] Open
Abstract
A general consensus supports fundamental roles for both genetic and environmental, mainly microbial, factors in the development of autoimmune diseases. One form of autoimmune rheumatic diseases is confined to a group of nonpyogenic conditions which are usually preceded by or associated with either explicit or occult infections. A previous history of clinical pharyngitis, gastroenteritis/urethritis, or tick-borne skin manifestation can be obtained from patients with rheumatic fever, reactive arthritis, or Lyme disease, respectively, whilst, other rheumatic diseases like rheumatoid arthritis (RA), ankylosing spondylitis (AS), and Crohn's disease (CD) are usually lacking such an association with a noticeable microbial infection. A great amount of data supports the notion that RA is most likely caused by Proteus asymptomatic urinary tract infections, whilst AS and CD are caused by subclinical bowel infections with Klebsiella microbes. Molecular mimicry is the main pathogenetic mechanism that can explain these forms of microbe-disease associations, where the causative microbes can initiate the disease with consequent productions of antibacterial and crossreactive autoantibodies which have a great impact in the propagation and the development of these diseases.
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