1
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Nelson HA, Banerjee D, Novis CL, Deane KD, Feser ML, Nandakumar V. A comparison of anti-cyclic citrullinated peptides (CCP3 and CCP3.1) autoantibody tests in rheumatoid arthritis. Pract Lab Med 2024; 41:e00420. [PMID: 39161944 PMCID: PMC11332063 DOI: 10.1016/j.plabm.2024.e00420] [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: 05/11/2024] [Revised: 06/21/2024] [Accepted: 07/17/2024] [Indexed: 08/21/2024] Open
Abstract
Background Anti-citrullinated protein antibodies (ACPA) are a specific serological biomarker used in the diagnosis of rheumatoid arthritis (RA). In clinical practice ACPA can be identified using immunoassays targeting synthetic cyclic citrullinated peptides (CCP). The 3rd generation anti-CCP IgG antibody (CCP3) offers improved sensitivity compared to the earlier versions. Recently, CCP3.1, capable of detecting both IgG and IgA antibodies, was introduced to enhance sensitivity, especially in patients with early RA. Methods We assessed serum CCP3.1 against CCP3 in 331 subjects undergoing RA panel serology, comprising 136 patients with RA and 195 patients without RA. Sera were tested for anti-CCP IgG (CCP3) and anti-CCP IgG/IgA (CCP3.1) antibodies. Clinical performance of these tests was compared at manufacturer-suggested cutoffs. A separate set of 81 patients with a diagnosis of RA by 2010 criteria and whose samples were obtained from within 1-year of RA diagnosis was similarly assessed to evaluate assay performance in an independent clinical RA cohort. Results Overall diagnostic accuracy was similar; CCP3 had an area under the curve (AUC) of 0.88, CCP3.1 had an AUC of 0.89. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for CCP3 were 79 %, 91 %, 86 %, and 86 %, respectively. For CCP3.1, sensitivity was 78 %, specificity 93 %, PPV 89 %, NPV 86 %. Both assays demonstrated excellent agreement; positive percent agreement of 94 % and negative percent agreement of 99 %. Conclusion Our findings indicate comparable diagnostic accuracy between CCP3 and CCP3.1 assays in these clinical cohorts.
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Affiliation(s)
- Heather A. Nelson
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, USA
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Dipanwita Banerjee
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, USA
| | - Camille L. Novis
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, USA
| | - Kevin D. Deane
- University of Colorado School of Medicine Anschutz Medical Campus, Aurora, CO, USA
| | - Marie L. Feser
- University of Colorado School of Medicine Anschutz Medical Campus, Aurora, CO, USA
| | - Vijayalakshmi Nandakumar
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, USA
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, USA
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2
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Mortazavi N, Abdolahi N, Saeidi M, Ali Vakili M, Mohebrad P. Salivary anti-cyclic citrullinated peptide as a screening tool for rheumatoid arthritis. Arch Rheumatol 2023; 38:95-100. [DOI: 10.46497/archrheumatol.2023.9032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 03/11/2022] [Indexed: 03/18/2023] Open
Abstract
Objectives: This study aims to evaluate the sensitivity and specificity of salivary anti-cyclic citrullinated peptide 3 (anti-CCP3) for the early diagnosis of rheumatoid arthritis.
Patients and methods: Between June 2017 and April 2019, a total of 63 patients with rheumatoid arthritis (10 males, 53 females; mean age: 50.4±9.5 years; range, 27 to 74 years) and 49 healthy controls (8 males, 41 females; mean age: 49.3±9.3 years; range 27 to 67 years) were included. Salivary samples were collected by passive drooling. Anti-cyclic citrullinated peptide analyses of salivary and serum samples were performed.
Results: The mean polyclonal immunoglobulin (Ig)G-IgA anti-CCP3 salivary levels were significantly different in patients (149.2±134.2) compared to healthy controls (28.5±23.9). The mean polyclonal IgG-IgA anti-CCP3 serum levels were measured as 254.0±169.5 in patients and 3.8±3.6 in healthy individuals. The diagnostic accuracy analysis of salivary IgG-IgA anti-CCP3 results in an area under the curve (AUC) of 0.818, as well as 91.84% specificity and 61.90% sensitivity.
Conclusion: Salivary anti-CCP3 may be considered as an additional screening test for rheumatoid arthritis.
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3
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Sieghart D, Konrad C, Swiniarski S, Haslacher H, Aletaha D, Steiner G. The diagnostic and prognostic value of IgG and IgA anti-citrullinated protein antibodies in patients with early rheumatoid arthritis. Front Immunol 2023; 13:1096866. [PMID: 36685579 PMCID: PMC9849943 DOI: 10.3389/fimmu.2022.1096866] [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: 11/12/2022] [Accepted: 12/09/2022] [Indexed: 01/07/2023] Open
Abstract
Objectives Anti-citrullinated peptide antibodies (ACPA) are specific markers for rheumatoid arthritis (RA) and typically measured by assays employing a cyclic citrullinated peptide (CCP) as antigen. This study was aimed at investigating the diagnostic performance of anti-CCP2 and anti-CCP3 IgG and IgA assays in patients with early RA with a particular focus on the potential prognostic value of IgA ACPA. Methods The anti-CCP3.1 assay (Inova Diagnostics) measuring IgG and IgA antibodies simultaneously was compared to anti-CCP2 IgG and IgA assays (Thermo Fisher Scientific) employing sera of 184 early RA patients, 360 disease controls and 98 healthy subjects. Results Anti-CCP2 IgG and IgA assays showed high specificity versus disease controls (98.9%; 99.4%). Sensitivity was 52.2% (IgG) and 28.8% (IgA), resulting in positive likelihood ratios (LR+) of 47.5 (IgG) and 48.0 (IgA). The anti-CCP3.1 assay proved slightly more sensitive than the anti-CCP2 IgG assay (56%) but specificity was markedly lower (90.8% versus disease controls). However, when using a threefold higher cut-off specificity of the anti-CCP3.1 assay increased (97.5%) while sensitivity (52.7%) became comparable to the anti-CCP2 IgG assay resulting in a LR+ of 21.5. Anti-CCP2 IgA antibodies did not increase the diagnostic sensitivity of ACPA testing, but IgA positive patients showed diminished responses to treatment with anti-TNF biologicals compared to patients who had only IgG antibodies. Conclusion Specificity of ACPA assays should be adjusted to reduce the risk of misclassification and a false positive diagnosis. Determination of ACPA IgA might provide important prognostic information concerning therapeutic responses.
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Affiliation(s)
- Daniela Sieghart
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | | | | | - Helmuth Haslacher
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Daniel Aletaha
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Günter Steiner
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria,Ludwig Boltzmann Institute for Arthritis and Rehabilitation, Vienna, Austria,*Correspondence: Günter Steiner,
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4
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Van Hoovels L, Studenic P, Sieghart D, Steiner G, Bossuyt X, Rönnelid J. Impact of autoimmune serology test results on RA classification and diagnosis. J Transl Autoimmun 2022; 5:100142. [PMID: 35036891 PMCID: PMC8749172 DOI: 10.1016/j.jtauto.2022.100142] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 12/29/2021] [Accepted: 01/03/2022] [Indexed: 12/04/2022] Open
Abstract
Rheumatoid arthritis (RA) is the most common systemic autoimmune disease and also the most severe arthritic disorder. The measurement of rheumatoid factor (RF) and anti-citrullinated protein antibodies (ACPA) in serum supports the diagnosis of RA, which gained increasing significance over the last 65 years. However, a high variability between RF and ACPA methods has been described, impacting the diagnostic performance of the current ACR/EULAR RA classification criteria. The great number of commercially available assays, often lacking traceability to an international standard, is a major factor attributing to this in-between assay variability. The adoption of an international standard for ACPA, as is since long available for rheumatoid factor, is therefore highly desirable. Further harmonization in clinical interpretation of RF/ACPA assays could be obtained by harmonization of the cut-offs, for both the low and high antibody levels, based on predefined specificity in disease controls. Reporting test result specific likelihood ratios (LR) adds value in the interpretation of autoantibody tests. However, a good understanding of the control population used to define antibody test result interval-associated LRs is crucial in defining the diagnostic performance characteristics of antibody serology. Finally, specificity in RA classification can be improved by refining serological weight scoring taking into account the nature of the antibody, the antibody level and double RF + ACPA positivity.
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Affiliation(s)
- Lieve Van Hoovels
- Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium.,Department of Laboratory Medicine, OLV Hospital, Aalst, Belgium
| | - Paul Studenic
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria.,Division of Rheumatology, Department of Medicine (Solna), Karolinska Institutet, Stockholm, Sweden
| | - Daniela Sieghart
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Günter Steiner
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria.,Ludwig Boltzmann Institute for Arthritis and Rehabilitation, Vienna, Austria
| | - Xavier Bossuyt
- Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium.,Department of Laboratory Medicine, University Hospital Leuven, Leuven, Belgium
| | - Johan Rönnelid
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
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5
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Citrullinated Antigens with Multiple Citrulline Similar Motif in the Diagnosis of Rheumatoid Arthritis: A Preliminary Single-Center Study. J Immunol Res 2021; 2021:1891519. [PMID: 34423050 PMCID: PMC8376434 DOI: 10.1155/2021/1891519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 07/24/2021] [Accepted: 08/01/2021] [Indexed: 11/18/2022] Open
Abstract
The presence of anti-citrullinated protein antibodies (ACPAs) in the serum is one of the immunological features of rheumatoid arthritis (RA). Anti-cyclic citrullinated peptide (CCP) assay has been widely used in clinic for the diagnosis of RA. However, up to 40% of RA patients are anti-CCP negative and the diagnostic sensitivity in this population needs to be improved for better clinical management. In this study, peptides with Multiple Citrulline Similar Motif (MCSM) were synthesized and a new ELISA system, which we called RA_CP, was developed to detect citrullinated antigens with MCSM present in the serum. 106 RA,48 other arthritis patients and 41 sex- and age-matched healthy controls (HCs) were included in this study. Patients with RA have a significantly higher amount of citrullinated antigens with MCSM than other arthritis patients and HCs. RA patients with positive anti-CCP are also MCSM positive, whereas 75% anti-CCP negative patients are positive for MCSM. The diagnostic sensitivity for anti-CCP and MCSM was 81.1% and 95.3%, while the specificity was 100% and 94.4%, respectively. ROC curve analyses showed that the area under the curve (AUC) values were 0.906 (95% CI: 0.860-0.951) for anti-CCP and 0.948 (95% CI: 0.912-0.985) for MCSM while the combination of MCSM and anti-CCP test has the highest AUC (0.971, 95% CI: 0.946-0.996). Our results suggest that detection of citrullinated antigens with MCSM has improved sensitivity compared with anti-CCP assay and could serve as a biomarker in diagnosis of RA patients.
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Rönnelid J, Turesson C, Kastbom A. Autoantibodies in Rheumatoid Arthritis - Laboratory and Clinical Perspectives. Front Immunol 2021; 12:685312. [PMID: 34054878 PMCID: PMC8161594 DOI: 10.3389/fimmu.2021.685312] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 04/20/2021] [Indexed: 01/03/2023] Open
Abstract
Measurement of two groups of autoantibodies, rheumatoid factor (RF) and anti-citrullinated protein/peptide antibodies (ACPA) have gained increasing significance in the diagnosis and classification of rheumatoid arthritis (RA) over the last 65 years. Despite this rising importance of autoimmune serology in RA, there is a palpable lack of harmonization between different commercial RF and ACPA tests. While a minimal diagnostic specificity has been defined for RF tests, which almost always are related to an international reference preparation, neither of this applies to ACPA. Especially assays with low diagnostic specificity are associated with very low positive predictive values or post-test probabilities in real world settings. In this review we focus on issues of practical bearing for the clinical physician diagnosing patients who potentially have RA, or treating patients diagnosed with RA. We advocate that all clinically used assays for RF and ACPA should be aligned to a common diagnostic specificity of 98-99% compared to healthy controls. This high and rather narrow interval corresponds to the diagnostic specificity seen for many commercial ACPA tests, and represents a specificity that is higher than what is customary for most RF assays. Data on antibody occurrence harmonized in this way should be accompanied by test result-specific likelihood ratios for the target diagnosis RA on an ordinal or interval scale, which will provide the clinical physician with more granular and richer information than merely relating numerical values to a single cut-off point. As many physicians today are used to evaluate autoantibodies as positive or negative on a nominal scale, the introduction of test result-specific likelihood ratios will require a change in clinical mindset. We also discuss the use of autoantibodies to prognosticate future arthritis development in at-risk patients as well as predict severe disease course and outcome of pharmacological treatment.
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Affiliation(s)
- Johan Rönnelid
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden.,Department of Clinical Immunology and Transfusion Medicine, Uppsala University Hospital, Uppsala, Sweden
| | - Carl Turesson
- Rheumatology, Department of Clinical Sciences, Malmö, Lund University, Malmö, Sweden.,Department of Rheumatology, Skåne University Hospital, Malmö, Sweden
| | - Alf Kastbom
- Department of Rheumatology, Linköping University Hospital, Linköping, Sweden.,Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
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7
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Kamiya H, Panlaqui OM. Systematic review and meta-analysis of the risk of rheumatoid arthritis-associated interstitial lung disease related to anti-cyclic citrullinated peptide (CCP) antibody. BMJ Open 2021; 11:e040465. [PMID: 33789847 PMCID: PMC8016072 DOI: 10.1136/bmjopen-2020-040465] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
OBJECTIVE To clarify the risk of rheumatoid arthritis-associated interstitial lung disease (RA-ILD) related to anti-cyclic citrullinated peptide (CCP) antibody. ELIGIBILITY CRITERIA Patients with RA with and without ILD were eligible. The primary outcome was the prevalence or incidence of ILD. Primary studies of any design aside from a case report were eligible. INFORMATION SOURCES Medline, EMBASE, Science Citation Index Expanded and Cochrane Central Register of Controlled Trials were searched from the inception through 12 November 2019. DATA EXTRACTION AND RISK OF BIAS Two reviewers independently selected eligible reports, extracted relevant data and assessed risk of bias using a modified Quality in Prognostic Studies tool. DATA SYNTHESIS Meta-analysis was conducted using a random-effects model. QUALITY OF EVIDENCE The Grades of Recommendation, Assessment, Development and Evaluation system was applied. RESULTS Among 29 out of 827 records retrieved through electronic databases and four additional reports identified from other sources, 29 studies were focused for the review. A total of 10158 subjects were included and the mean age at inclusion was between 45.8 and 63.9 years. The mean RA duration was between 4.3 and 14.9 years. The positivity of anti-CCP antibody ranged from 50.7% to 95.8%. All studies except for two were deemed as high risk of bias. A pooled analysis of univariate results demonstrated that the presence of anti-CCP antibody was significantly associated with RA-ILD with an OR of 2.10 (95% CI: 1.59 to 2.78). Similarly, the titre of anti-CCP antibody was significantly higher for RA-ILD with a standardised mean difference of 0.42 (95% CI: 0.20 to 0.65). These results were confirmed by multivariate analysis in the majority of studies and consistent by any subgroup and sensitivity analyses. CONCLUSION The presence and higher titres of anti-CCP antibody were suggested to be significantly associated with an increased risk of RA-ILD. However, the quality of evidence was rated as low or very low.
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Affiliation(s)
- Hiroyuki Kamiya
- Department of Respiratory Medicine, Tatebayashi Kosei Hospital, Tatebayashi, Gunma, Japan
| | - Ogee Mer Panlaqui
- Department of Intensive Care Medicine, Northern Hospital, Epping, Victoria, Australia
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8
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Do anti-carbamylated protein antibodies in rheumatoid arthritis reflect local and systemic osteoporosis? A study of osteoprotegrin and receptor activator for nuclear factor kappa B ligand and radiological assessment. EGYPTIAN RHEUMATOLOGY AND REHABILITATION 2021. [DOI: 10.1186/s43166-021-00067-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
One of the most important and dangerous complications of rheumatoid arthritis (RA) is bone loss, which manifested by erosions and juxta-articular or systemic bone loss. Anti-carbamylated protein (anti-CarP) antibodies which are also called anti-homocitrulline antibodies have recently been found in RA. Increase anti-CarP antibody titres may lead to severe disease and increase the progression of bone loss. Osteoprotegrin and receptor activator for nuclear factor kappa B and its ligand (RANKL) are the main players in the pathogenesis of osteoporosis. Thus, we aimed to investigate and detect the presence and prevalence of anti-CarP in rheumatoid arthritis and their association with disease severity and osteoporosis, as well as with OPG/RANKL in 80 Egyptian RA patients to highlight this relationship which could be useful in managing RA patients with osteoporosis.
Results
Serum anti-CarP levels were significantly increased in the RA group compared with the control group (P< 0.001). We found a negative association between anti-CarP and anti-CCP and disease activity (r=−0.878, −0.534, respectively, P<0.001). We also found a positive correlation between anti-CarP and the Larsen score, DEXA score, RF, HAQ, and RANKL (r=0.646, 0.287, 0.243, 0.892, 0.671, 0.869 [respectively], P<0.001) and there was negative correlation between anti-CarP and OPG (r=−0.553, P<0.001).
Conclusion
Anti-CarP antibodies are associated with disease severity and disability in RA patients. They could play an important and significant role in the pathogenesis of osteoporosis in these patients.
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9
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Di Matteo A, Mankia K, Duquenne L, Mahler M, Corscadden D, Mbara K, Garcia‐Montoya L, Nam JL, Emery P. Third‐Generation Anti–Cyclic Citrullinated Peptide Antibodies Improve Prediction of Clinical Arthritis in Individuals at Risk of Rheumatoid Arthritis. Arthritis Rheumatol 2020; 72:1820-1828. [DOI: 10.1002/art.41402] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 05/15/2020] [Indexed: 12/13/2022]
Affiliation(s)
- Andrea Di Matteo
- University of Leeds NIHR Leeds Biomedical Research Centre Leeds Teaching Hospitals NHS Trust, Leeds, UK, and Polytechnic University of Marche Carlo Urbani Hospital Jesi Italy
| | - Kulveer Mankia
- University of Leeds NIHR Leeds Biomedical Research Centre Leeds Teaching Hospitals NHS Trust Leeds UK
| | - Laurence Duquenne
- University of Leeds NIHR Leeds Biomedical Research Centre Leeds Teaching Hospitals NHS Trust Leeds UK
| | - Michael Mahler
- Inova Diagnostics, Inc. San Diego California United States
| | - Diane Corscadden
- University of Leeds NIHR Leeds Biomedical Research Centre Leeds Teaching Hospitals NHS Trust Leeds UK
| | - Katie Mbara
- University of Leeds NIHR Leeds Biomedical Research Centre Leeds Teaching Hospitals NHS Trust Leeds UK
| | - Leticia Garcia‐Montoya
- University of Leeds NIHR Leeds Biomedical Research Centre Leeds Teaching Hospitals NHS Trust Leeds UK
| | - Jacqueline L. Nam
- University of Leeds NIHR Leeds Biomedical Research Centre Leeds Teaching Hospitals NHS Trust Leeds UK
| | - Paul Emery
- University of Leeds NIHR Leeds Biomedical Research Centre Leeds Teaching Hospitals NHS Trust Leeds UK
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10
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Aiman AQ, Nesrin M, Amal A, Nassar AD. A new tool for early diagnosis of rheumatoid arthritis using combined biomarkers; synovial MAGE-1 mRNA and serum anti-CCP and RF. Pan Afr Med J 2020; 36:270. [PMID: 33088399 PMCID: PMC7545977 DOI: 10.11604/pamj.2020.36.270.21827] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 06/27/2020] [Indexed: 11/15/2022] Open
Abstract
Introduction rheumatoid arthritis (RA) is a common autoimmune disease with unknown etiology and pathogenesis. Biomarkers have the potential to aid in the clinical diagnosis of the disease, or to provide means of detecting early signs of the disease. Evaluating Melanoma associated antigen genes (MAGE-1) mRNA expression rate in synovial fluid cells and serum levels of anti-cyclic citrullinated peptides (anti-CCP) and rheumatoid factor (RF) for RA early diagnosis. Methods a total of 213 subjects were enrolled in the study, 135 RA patients and 78 normal subjects with traumatic knee joints (control group). Serum RF and anti-CCP were estimated quantitatively using ELISA. MAGE-1 mRNA expression rate was analyzed by RT-PCR. Results a significant increase in serum levels of RF IgM and anti-CCP in RA patients compared to the controls. A positively significant correlation was found between serum anti-CCP and RF IgM. The expression rate of MAGE-1 mRNA was 100% in RA patients versus the controls (0%). The specificity and the sensitivity of the three biomarkers was 100%. Conclusion the high expression rate of MAGE-1 in synovial fluid cells of RA patients is encouraging its utilization as a diagnostic biomarker for RA. The combined use of MAGE-1 transcript in synovial fluid cells, serum RF and anti-CCP is recommended for improving early diagnostic ability of RA.
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Affiliation(s)
- Al-Qtaitat Aiman
- Department of Anatomy and Histology, Faculty of Medicine, Mutah University, Mutah, Jordan
| | - Mwafi Nesrin
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, Mutah University, Mutah, Jordan
| | - Albtoosh Amal
- Department of Anatomy and Histology, Faculty of Medicine, Mutah University, Mutah, Jordan
| | - Al-Dalaien Nassar
- Department of Orthopedic Surgery, Jordan University Hospital, The University of Jordan, Mutah, Jordan
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11
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Birkelund S, Bennike TB, Kastaniegaard K, Lausen M, Poulsen TBG, Kragstrup TW, Deleuran BW, Christiansen G, Stensballe A. Proteomic analysis of synovial fluid from rheumatic arthritis and spondyloarthritis patients. Clin Proteomics 2020; 17:29. [PMID: 32782445 PMCID: PMC7412817 DOI: 10.1186/s12014-020-09292-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Accepted: 07/29/2020] [Indexed: 01/03/2023] Open
Abstract
Background The aetiologies and pathogeneses of the joint diseases rheumatoid arthritis (RA) and spondyloarthritis (SpA) are still not fully elucidated. To increase our understanding of the molecular pathogenesis, we analysed the protein composition of synovial fluid (SF) from rheumatoid arthritis (RA) and spondyloarthritis (SpA) patients. Methods Fifty-six synovial fluid samples (RA, n = 32; SpA, n = 24) were digested with trypsin, and the resulting peptides were separated by liquid chromatography and analysed by tandem mass spectrometry. Additionally, the concentration of cell-free DNA (cfDNA) in the synovial fluid was measured, and plasma C-reactive protein (CRP) was determined. Results Three hundred thirty five proteins were identified within the SF. The more abundant proteins seen in RA SF were inflammatory proteins, including proteins originating from neutrophil granulocytes, while SpA SF had less inflammatory proteins and a higher concentration of haptoglobin. The concentration of cell-free DNA in the SF increased together with proteins that may have originated from neutrophils. Plasma CRP levels in both RA and SpA, correlated to other acute phase reactants. Conclusions The proteomic results underline that neutrophils are central in the RA pathology but not in SpA, and even though inhibitors of neutrophils (migration, proteinase inhibitors) were present in the SF it was not sufficient to interrupt the disease process.
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Affiliation(s)
- Svend Birkelund
- Department of Health Science and Technology, Aalborg University, 9200 Aalborg Ø, Denmark.,Department of Health Science and Technology, Medical Microbiology and Immunology, Aalborg University, Fredriks Bajers Vej 3b, 9200 Aalborg Ø, Denmark
| | - Tue Bjerg Bennike
- Department of Health Science and Technology, Aalborg University, 9200 Aalborg Ø, Denmark
| | - Kenneth Kastaniegaard
- Department of Health Science and Technology, Aalborg University, 9200 Aalborg Ø, Denmark.,Biogenity, 9200 Aalborg Ø, Denmark
| | - Mads Lausen
- Department of Health Science and Technology, Aalborg University, 9200 Aalborg Ø, Denmark
| | | | - Tue Wenzel Kragstrup
- Department of Biomedicine, Aarhus University, 8000 Aarhus C, Denmark.,Department of Rheumatology, Aarhus University Hospital, 8000 Aarhus C, Denmark
| | - Bent Winding Deleuran
- Department of Biomedicine, Aarhus University, 8000 Aarhus C, Denmark.,Department of Rheumatology, Aarhus University Hospital, 8000 Aarhus C, Denmark
| | - Gunna Christiansen
- Department of Health Science and Technology, Aalborg University, 9200 Aalborg Ø, Denmark
| | - Allan Stensballe
- Department of Health Science and Technology, Aalborg University, 9200 Aalborg Ø, Denmark
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12
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Abstract
Accurate diagnosis of inflammatory arthritides remains a challenge because of substantial clinical overlap. To achieve a granular classification for informing clinical decisions, numerous potential serologic biomarkers have been identified. Rheumatologists have settled on rheumatoid factor and anti-citrullinated protein antibodies for the diagnosis of rheumatoid arthritis (RA) based on specificity and sensitivity and their ability to be integrated into clinical algorithms. These biomarkers should be interpreted in their specific clinical context. This article discusses the serologic basis for the diagnosis of RA, how these biomarkers have framed conceptualization of the pathogenesis of RA, and the inherent limitations in their use.
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13
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Veigas B, Matias A, Calmeiro T, Fortunato E, Fernandes AR, Baptista PV. Antibody modified gold nanoparticles for fast colorimetric screening of rheumatoid arthritis. Analyst 2019; 144:3613-3619. [PMID: 31070614 DOI: 10.1039/c9an00319c] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Rheumatoid arthritis (RA) is a systemic autoimmune disease characterized by chronic joint inflammation and one of the main causes of chronic disability worldwide with high prevalence in the ageing population. RA is characterized by autoantibody production, synovial inflammation and bone destruction, and the most accepted biomarker is rheumatoid factor (RF) autoantibodies. In this work, we developed a low-cost approach for the detection and quantification of the RF marker. This colorimetric immunosensor is based on gold nanoprobe crosslinking that results in extensive aggregation in the presence of the pentameric IgM RF. Aggregation of the nanoconjugates yields a color change from red to purple that can be easily observed by the naked eye. The interaction between nanoconjugates and the specific target was confirmed via dynamic light scattering (DLS), Raman spectroscopy and atomic force microscopy (AFM) imaging. This conceptual system shows a LOD of 4.15 UA mL-1 IgM RF (clinical threshold is set for 20 IU mL-1). The one-step biosensor strategy herein proposed is much faster than conventional detection techniques, without the need for secondary antibodies, additional complex washing or signal amplification protocols. To the best of our knowledge this is the first report on target induced aggregation of gold nanoprobes for quantitative colorimetric autoantibody detection.
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Affiliation(s)
- Bruno Veigas
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal. and CENIMAT
- i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Ana Matias
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.
| | - Tomás Calmeiro
- CENIMAT
- i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Elvira Fortunato
- CENIMAT
- i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Alexandra R Fernandes
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.
| | - Pedro Viana Baptista
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.
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Comparative study of the diagnostic and prognostic value of antibodies against chimeric citrullinated synthetic peptides and CCP3/CCP3.1 assays. Clin Chem Lab Med 2019; 56:285-293. [PMID: 28850543 DOI: 10.1515/cclm-2017-0264] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 07/20/2017] [Indexed: 11/15/2022]
Abstract
BACKGROUND The objective of the study was to compare the diagnostic yield of home-made ELISA tests based on synthetic chimeric fibrin/filaggrin citrullinated peptides (CFFCPs) with CCP3 and CCP3.1 commercial tests to detect anti-citrullinated protein/peptide antibodies (ACPAs) in rheumatoid arthritis (RA) patients. The prognostic value is also studied in a cohort of patients with early RA. Moreover, we transfer immunological assays from microtiter plates to microarray formats to allow the simultaneous analysis of several peptide sequences and reduce the volume of serum from patients. METHODS The diagnostic study includes: 100 RA patients who fulfilled the 1987 ACR criteria; 100 healthy blood donors; 35 patients with SLE according ACR criteria; 35 patients with PsA fulfilling the Wright and Moll criteria and 30 patients with HCV infection. The prognostic value study includes 50 patients with early RA with follow-up data available. All samples are from outpatients attending the Rheumatology Department of the Hospital Clinic of Barcelona. RESULTS Similar sensitivity, specificity and predictive values for the diagnosis of RA of CCFCPs compared to CCP3/CCP3.1 were obtained. Although a high concordance is observed between anti-CFFCPs and anti-CCP3/CCP3.1 in the early patients that rendered Larsen radiographic progression, CFFCPs could be a better marker of radiographic outcome. Strong correlations between the microarray and ELISA results were found for individual CFFCPs peptides. CONCLUSIONS The development of multiplexing techniques combining a different spectrum of markers in a single analysis, including CFFCP peptides, could allow a more detailed analysis of the autoantibodies reactivity found in the sera of patients suffering of this heterogeneous disease.
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Soliman E, Abdelati A, Fahmy R, Helmy M. Periodontal microbiota in a cohort of Egyptian patients with rheumatoid arthritis and their relation to serum and gingival anticitrullinated peptide protein antibodies and different disease parameters. EGYPTIAN RHEUMATOLOGY AND REHABILITATION 2018. [DOI: 10.4103/err.err_29_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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16
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Martinez-Prat L, Nissen MJ, Lamacchia C, Bentow C, Cesana L, Roux-Lombard P, Gabay C, Mahler M. Comparison of Serological Biomarkers in Rheumatoid Arthritis and Their Combination to Improve Diagnostic Performance. Front Immunol 2018; 9:1113. [PMID: 29928272 PMCID: PMC5997814 DOI: 10.3389/fimmu.2018.01113] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 05/03/2018] [Indexed: 12/21/2022] Open
Abstract
Introduction The diagnosis of rheumatoid arthritis (RA) is based on a combined approach that includes serological markers such as rheumatoid factor (RF) and anti-citrullinated peptide/protein antibodies (ACPA). The goal of this study was to evaluate the clinical performance of several RF and ACPA immunoassays for the diagnosis of RA, as well as the diagnostic value of a combinatory approach with these markers. Methods The study cohort included 1,655 patients from the Swiss Clinical Quality Management registry with sera from 968 patients with RA and 687 disease controls, including patients with axial spondyloarthritis (n = 450) and psoriatic arthritis (n = 237). ACPA were determined by anti-CCP2 IgG enzyme-linked immunosorbent assay (ELISA), QUANTA Flash® CCP3 IgG [chemiluminescent immunoassay (CIA)], and QUANTA Lite® CCP3 IgG ELISA. RF was determined by ELISA (QUANTA Lite® RF IgM, RF IgA, and RF IgG) and with two research use only CIAs (QUANTA Flash® RF IgM and RF IgA). Results All three ACPA assays showed good discrimination between RA patients and controls and good clinical performance. Overall, CCP3 performed better than CCP2. More pronounced differences were observed between the RF assays. We observed that CIA platforms for both RF IgM and RF IgA showed better performance than the ELISA platforms. Excellent and good total agreements were found between ELISA and CIA for CCP3 (total agreement 95.3%, kappa = 0.90), and between CCP2 and CCP3 ELISA (total agreement 86.6%, kappa = 0.73), respectively. RF IgM CIA and ELISA had a good qualitative agreement (86.5%, kappa = 0.73); RF IgA CIA and ELISA showed a moderate total agreement (78.5%, kappa = 0.53). When combinatory analyses were performed, the likelihood of RA increased with dual positivity and triple positivity and combining different markers resulted in higher odds ratio than the individual markers in all cases. Conclusion ACPA and RF showed good clinical performance in this large Swiss cohort of RA patients and controls. Overall, the performance of CCP3 was superior to CCP2. The combination of these biomarkers in an interval model represents a potential tool for the diagnosis of RA patients.
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Affiliation(s)
- Laura Martinez-Prat
- Research and Development, Inova Diagnostics, Inc., San Diego, CA, United States
| | - Michael J Nissen
- Division of Rheumatology, Geneva University Hospitals (HUG), Geneva, Switzerland
| | - Céline Lamacchia
- Division of Rheumatology, Geneva University Hospitals (HUG), Geneva, Switzerland
| | - Chelsea Bentow
- Research and Development, Inova Diagnostics, Inc., San Diego, CA, United States
| | - Laura Cesana
- Research and Development, Inova Diagnostics, Inc., San Diego, CA, United States.,Experimental Laboratory of Immunological and Rheumatologic Researches, Istituto Auxologico Italiano, Milan, Italy
| | - Pascale Roux-Lombard
- Division of Immunology and Allergy, Department of Internal Medicine Specialties, Geneva University Hospital (HUG), Geneva, Switzerland
| | - Cem Gabay
- Division of Rheumatology, Geneva University Hospitals (HUG), Geneva, Switzerland
| | - Michael Mahler
- Research and Development, Inova Diagnostics, Inc., San Diego, CA, United States
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Van Hoovels L, Jacobs J, Vander Cruyssen B, Van den Bremt S, Verschueren P, Bossuyt X. Performance characteristics of rheumatoid factor and anti-cyclic citrullinated peptide antibody assays may impact ACR/EULAR classification of rheumatoid arthritis. Ann Rheum Dis 2018; 77:667-677. [DOI: 10.1136/annrheumdis-2017-212365] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Revised: 11/07/2017] [Accepted: 11/28/2017] [Indexed: 11/04/2022]
Abstract
ObjectivesRheumatoid factor (RF) and anti-cyclic citrullinated protein/peptide antibodies (ACPA) are integrated in the 2010 American College of Rheumatology/European League Against Rheumatism (ACR/EULAR) classification criteria for rheumatoid arthritis (RA). The objectives of this study were to evaluate the technical and diagnostic performance of different RF and ACPA assays and to evaluate whether differences in performance impact RA classification.MethodsSamples from 594 consecutive patients who for the first time consulted a rheumatologist (44 of whom were diagnosed with RA) and 26 extra newly diagnosed patients with RA were analysed with six different RF assays (Menarini, Thermo Fisher, Inova, Roche, Abbott, Euroimmun) and seven different ACPA assays (Menarini, Thermo Fisher, Inova, Roche, Abbott, Euro Diagnostica, Euroimmun).ResultsWe found differences in analytical performance between assays. There was poor numerical agreement between the different RF and ACPA assays. For all assays, the likelihood ratio for RA increased with increasing antibody levels. The areas under the curve of receiver operating characteristic analysis of the RF (range 0.676–0.709) and ACPA assays (range 0.672–0.769) only differed between some ACPA assays. Nevertheless, using the cut-off proposed by the manufacturer, there was a large variation in sensitivity and specificity between assays (mainly for RF). Consequently, depending on the assay used, a subgroup of patients (13% for RF, 1% for ACPA and 9% for RF/ACPA) might or might not be classified as RA according to the 2010 ACR/EULAR criteria.ConclusionDue to poor harmonisation of RF and ACPA assays and of test result interpretation, RA classification according to 2010 ACR/EULAR criteria may vary when different assays are used.
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Vos I, Van Mol C, Trouw LA, Mahler M, Bakker JA, Van Offel J, De Clerck L, Huizinga TW. Anti-citrullinated protein antibodies in the diagnosis of rheumatoid arthritis (RA): diagnostic performance of automated anti-CCP-2 and anti-CCP-3 antibodies assays. Clin Rheumatol 2017; 36:1487-1492. [PMID: 28578492 PMCID: PMC5486477 DOI: 10.1007/s10067-017-3684-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 05/09/2017] [Accepted: 05/15/2017] [Indexed: 11/26/2022]
Abstract
This study compares the diagnostic performance of a second generation anti-cyclic citrullinated peptide antibody (CCP2) with a third generation anti-CCP antibodies assay (CCP3), as well as the combination of both tests. Serum samples of 127 patients were analyzed. IgG anti-CCP 2 and IgM rheumatoid factor were determined by EliA™ technique on a Phadia 250 instrument (Thermo Fisher Scientific), anti-CCP3 by the Quanta Flash™ anti-CCP3 IgG kit, BIO-FLASH Rapid Response Chemiluminscence Analyzer (INOVA Diagnostics). Diagnostic performance was compared using ROC-curves, sensitivity, specificity, likelihood ratios, and predictive values. Logistic regressions were used to investigate whether using both tests (anti-CCP2 and anti-CCP3) gives a better prediction of rheumatoid arthritis. At the manufacturer’s cut-offs sensitivity and specificity were 79.4 and 61.0% for CCP3 and 80.9 and 69.5% for CCP2. No significant differences could be observed regarding the areas under the curve (AUC) of both ROC-curves. The optimal cut-off point for CCP2 was 10.5 U/ml (sensitivity of 75.0% and specificity of 80.0%) and 5.6 U/ml for CCP3 (sensitivity of 86.9% and specificity of 61.0%). Binary logistic regressions indicated that the likelihood of having rheumatoid arthritis (RA) is significantly higher when testing positive on both CCP2 and CCP3 compared to CCP2 or CCP3 alone. In our cohort, comparable performance was found between the two CCP assays. Positivity for both CCP2 and CCP3 resulted in the most specific identification of RA patients. In patients with joint complaints suspected of having RA and with a weakly positive CCP 2 (≥7 and ≤16 U/ml) CCP3 testing could be of additive value for diagnosing RA.
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Affiliation(s)
- Ine Vos
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands.
- Department of Rheumatology, University Hospital of Antwerp, Edegem, Belgium.
| | - Christof Van Mol
- Netherlands Interdisciplinary Demographic Institute/KNAW/UG, The Hague, the Netherlands
| | - Leendert A Trouw
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | | | - Jaap A Bakker
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Jan Van Offel
- Department of Rheumatology, University Hospital of Antwerp, Edegem, Belgium
| | - Luc De Clerck
- Department of Rheumatology, University Hospital of Antwerp, Edegem, Belgium
| | - Tom W Huizinga
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
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Characterization of Autoantigens Targeted by Anti-Citrullinated Protein Antibodies In Vivo: Prominent Role for Epitopes Derived from Histone 4 Proteins. PLoS One 2016; 11:e0165501. [PMID: 27788229 PMCID: PMC5082836 DOI: 10.1371/journal.pone.0165501] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 10/12/2016] [Indexed: 01/10/2023] Open
Abstract
Anti-citrullinated protein antibodies (ACPA) have become an integral part of the clinical definition of rheumatoid arthritis, and are hypothesized to be important in the immunopathogenesis of this autoimmune disease. Several citrullinated proteins have been demonstrated to serve as candidate autoantigens for the ACPA, based on in vitro immune reactions between citrullinated peptides/proteins and RA sera. Yet it remains unclear whether the autoantigens identified in vitro are indeed directly and specifically targeted by the ACPA in vivo. Moreover, it is unclear whether ACPA present in RA sera are directed towards the same spectrum of autoantigens as the ACPA present within the synovial compartment. In this study, we isolated ACPA immune complexes from RA synovial fluids (SF) and sera by using immobilized cyclic citrullinated peptides (CCP3) based immune affinity, and characterized the proteins that are directly and specifically associated with them by mass spectrometry. The results demonstrate that four histone proteins are prominent ACPA autoantigens, with the frequency of detection being histone H4 (89%), H2B (63%), H3 (63%), and H2A (58%) in ACPA positive RA SF. We further demonstrate that a histone 4 peptide containing citrulline at position Cit39 was recognized by 100% of ACPA positive RA SF. An adjacent citrulline residue at Cit40 was recognized by 34% of ACPA positive RA SF. An H4 peptide containing Cit39-40 was recognized in the serum of 94% ACPA positive RA, 77% ACPA positive first-degree relatives (FDR) of RA patients, and 2.5% of healthy controls. The Cit39-40 peptide substantially blocked the ACPA reactivity in both SF and serum. Although the spectrum of ACPA we identified was limited to those isolated using immobilized CCP3 peptides, the findings indicate that H4 is a widely recognized RA autoantigen in both the synovial and serum compartments. The identification of this immunodominant ACPA epitope may be valuable in designing approaches to immune tolerance induction in RA.
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Travers TS, Harlow L, Rosas IO, Gochuico BR, Mikuls TR, Bhattacharya SK, Camacho CJ, Ascherman DP. Extensive Citrullination Promotes Immunogenicity of HSP90 through Protein Unfolding and Exposure of Cryptic Epitopes. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2016; 197:1926-36. [PMID: 27448590 PMCID: PMC5061338 DOI: 10.4049/jimmunol.1600162] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 06/16/2016] [Indexed: 12/29/2022]
Abstract
Post-translational protein modifications such as citrullination have been linked to the breach of immune tolerance and clinical autoimmunity. Previous studies from our laboratory support this concept, demonstrating that autoantibodies targeting citrullinated isoforms of heat shock protein 90 (HSP90) are associated with rheumatoid arthritis complicated by interstitial lung disease. To further explore the relationship between citrullination and structural determinants of HSP90 immunogenicity, we employed a combination of ELISA-based epitope profiling, computational modeling, and mass-spectrometric sequencing of peptidylarginine deiminase (PAD)-modified protein. Remarkably, ELISAs involving selected citrullinated HSP90β/α peptides identified a key epitope corresponding to an internal Arg residue (R502 [HSP90β]/R510 [HSP90α]) that is normally buried within the crystal structure of native/unmodified HSP90. In vitro time/dose-response experiments reveal an ordered pattern of PAD-mediated deimination events culminating in citrullination of R502/R510. Conventional as well as scaled molecular dynamics simulations further demonstrate that citrullination of selected Arg residues leads to progressive disruption of HSP90 tertiary structure, promoting exposure of R502/R510 to PAD modification and subsequent autoantibody binding. Consistent with this process, ELISAs incorporating variably deiminated HSP90 as substrate Ag indicate a direct relationship between the degree of citrullination and the level of ex vivo Ab recognition. Overall, these data support a novel structural paradigm whereby citrullination-induced shifts in protein structure generate cryptic epitopes capable of bypassing B cell tolerance in the appropriate genetic context.
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Affiliation(s)
- Timothy S. Travers
- Department of Computational and Systems Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - Lisa Harlow
- Department of Medicine, Division of Rheumatology, University of Miami Miller School of Medicine, Miami, Florida 33136
| | - Ivan O. Rosas
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital, Boston, Massachusetts 02115
| | | | - Ted R. Mikuls
- Department of Medicine, Division of Rheumatology, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Sanjoy K. Bhattacharya
- Department of Ophthalmology, University of Miami Miller School of Medicine, Miami, Florida 33136
| | - Carlos J. Camacho
- Department of Computational and Systems Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - Dana P. Ascherman
- Department of Medicine, Division of Rheumatology, University of Miami Miller School of Medicine, Miami, Florida 33136
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Bertin D, Dubucquoi S, Lakomy D, Deleplancque AS, Desplat-Jégo S. Diagnostic performance of a new vimentin-derived ACPA (CCP high sensitive) in patients with rheumatoid arthritis. Immunol Res 2016; 64:455-60. [DOI: 10.1007/s12026-015-8690-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Pozsgay J, Szarka E, Huber K, Babos F, Magyar A, Hudecz F, Sarmay G. Synthetic Peptide-Based ELISA and ELISpot Assay for Identifying Autoantibody Epitopes. Methods Mol Biol 2016; 1352:223-233. [PMID: 26490479 DOI: 10.1007/978-1-4939-3037-1_17] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Enzyme-linked immunosorbent assay (ELISA) is an invaluable diagnostic tool to detect serum autoantibody binding to target antigen. To map the autoantigenic epitope(s), overlapping synthetic peptides covering the total sequence of a protein antigen are used. A large set of peptides synthesized on the crown of pins can be tested by Multipin ELISA for fast screening. Next, to validate the results, the candidate epitope peptides are resynthesized by solid-phase synthesis, coupled to ELISA plate directly, or in a biotinylated form, bound to neutravidin-coated surface and the binding of autoantibodies from patients' sera is tested by indirect ELISA. Further, selected epitope peptides can be applied in enzyme-linked immunospot assay to distinguish individual, citrullinated peptide-specific autoreactive B cells in a pre-stimulated culture of patients' lymphocytes.
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Affiliation(s)
- Judit Pozsgay
- Department of Immunology, Eötvös Loránd University, Pázmány Péter sétány 1/c, Budapest, 1117, Hungary
| | - Eszter Szarka
- Department of Immunology, Eötvös Loránd University, Pázmány Péter sétány 1/c, Budapest, 1117, Hungary
| | - Krisztina Huber
- Department of Immunology, Eötvös Loránd University, Pázmány Péter sétány 1/c, Budapest, 1117, Hungary
| | - Fruzsina Babos
- MTA-ELTE Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Budapest, Hungary
| | - Anna Magyar
- MTA-ELTE Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Budapest, Hungary
| | - Ferenc Hudecz
- Department of Organic Chemistry, Eötvös Loránd University, Budapest, Hungary
- MTA-ELTE Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Budapest, Hungary
| | - Gabriella Sarmay
- Department of Immunology, Eötvös Loránd University, Pázmány Péter sétány 1/c, Budapest, 1117, Hungary.
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Th-17 cells and serum IL-17 in rheumatoid arthritis patients: Correlation with disease activity and severity. EGYPTIAN RHEUMATOLOGIST 2016. [DOI: 10.1016/j.ejr.2015.01.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Martin L, Steber WA, Lupton TL, Mahler M, Fitch CM, McMillan JD, Schmidt DR, Fritzler MJ. Clinical and serological analysis of patients with positive anticyclic citrullinated Peptide antibodies referred through a Rheumatology Central Triage System. J Rheumatol 2015; 42:771-7. [PMID: 25641884 DOI: 10.3899/jrheum.141054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/12/2014] [Indexed: 01/14/2023]
Abstract
OBJECTIVE Anticitrullinated protein antibodies (ACPA) are a highly specific and sensitive biomarker for the diagnosis of rheumatoid arthritis (RA). Some patients who were found to have a positive ACPA test were referred to our Rheumatology Central Triage (CT; Calgary, Alberta, Canada) for assessment by a rheumatologist. The objectives of our study were to determine the clinical accuracy of ACPA in establishing a diagnosis of RA in a real-time clinical setting. METHODS Cases that met 3 criteria were included in the study: (1) referred to the CT over 3 calendar years (n = 20,389), (2) reason for referral was a positive ACPA test (n = 568), and (3) evaluated by a certified rheumatologist (n = 314). An administrative serological database was used to retrieve specific ACPA results. RESULTS Of patients referred through our CT for evaluation of a positive ACPA test, 57.6% received a diagnosis of RA; the remainder had a variety of other diagnoses, some of which might be considered early RA (9%). The predictive values of ACPA for the diagnosis of RA were increased when rheumatoid factor (RF) results were included in the analysis. When definite and possible RA were combined and the prevalence of moderate/high ACPA was compared to all other individuals, the positive and negative predictive values for moderate/high ACPA for RA were 74.3% and 68.4%, respectively. CONCLUSION About 58% of patients with a positive ACPA referred through a triage system for a rheumatologist opinion received a diagnosis of RA at their first visit. RF provides additional useful information to guide the diagnosis and urgency of referral.
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Affiliation(s)
- Liam Martin
- From the Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada; and Inova Diagnostics Inc., San Diego, California, USA.L. Martin, MB, MRCPI, FRCPC, Professor of Medicine; W.A. Steber, BPE, BSc, Clinical Research Manager; T.L. Lupton, RN, Clinical Coordinator; C.M. Fitch, RN; J.D. McMillan, Research Assistant; D.R. Schmidt, Research Assistant; M.J. Fritzler, PhD, MD, FRCPC, Professor of Medicine, Faculty of Medicine, University of Calgary; M. Mahler, PhD, Vice-President, Research and Development, Inova Diagnostics Inc
| | - Whitney A Steber
- From the Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada; and Inova Diagnostics Inc., San Diego, California, USA.L. Martin, MB, MRCPI, FRCPC, Professor of Medicine; W.A. Steber, BPE, BSc, Clinical Research Manager; T.L. Lupton, RN, Clinical Coordinator; C.M. Fitch, RN; J.D. McMillan, Research Assistant; D.R. Schmidt, Research Assistant; M.J. Fritzler, PhD, MD, FRCPC, Professor of Medicine, Faculty of Medicine, University of Calgary; M. Mahler, PhD, Vice-President, Research and Development, Inova Diagnostics Inc
| | - Terri L Lupton
- From the Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada; and Inova Diagnostics Inc., San Diego, California, USA.L. Martin, MB, MRCPI, FRCPC, Professor of Medicine; W.A. Steber, BPE, BSc, Clinical Research Manager; T.L. Lupton, RN, Clinical Coordinator; C.M. Fitch, RN; J.D. McMillan, Research Assistant; D.R. Schmidt, Research Assistant; M.J. Fritzler, PhD, MD, FRCPC, Professor of Medicine, Faculty of Medicine, University of Calgary; M. Mahler, PhD, Vice-President, Research and Development, Inova Diagnostics Inc
| | - Michael Mahler
- From the Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada; and Inova Diagnostics Inc., San Diego, California, USA.L. Martin, MB, MRCPI, FRCPC, Professor of Medicine; W.A. Steber, BPE, BSc, Clinical Research Manager; T.L. Lupton, RN, Clinical Coordinator; C.M. Fitch, RN; J.D. McMillan, Research Assistant; D.R. Schmidt, Research Assistant; M.J. Fritzler, PhD, MD, FRCPC, Professor of Medicine, Faculty of Medicine, University of Calgary; M. Mahler, PhD, Vice-President, Research and Development, Inova Diagnostics Inc
| | - Christie M Fitch
- From the Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada; and Inova Diagnostics Inc., San Diego, California, USA.L. Martin, MB, MRCPI, FRCPC, Professor of Medicine; W.A. Steber, BPE, BSc, Clinical Research Manager; T.L. Lupton, RN, Clinical Coordinator; C.M. Fitch, RN; J.D. McMillan, Research Assistant; D.R. Schmidt, Research Assistant; M.J. Fritzler, PhD, MD, FRCPC, Professor of Medicine, Faculty of Medicine, University of Calgary; M. Mahler, PhD, Vice-President, Research and Development, Inova Diagnostics Inc
| | - Jacob D McMillan
- From the Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada; and Inova Diagnostics Inc., San Diego, California, USA.L. Martin, MB, MRCPI, FRCPC, Professor of Medicine; W.A. Steber, BPE, BSc, Clinical Research Manager; T.L. Lupton, RN, Clinical Coordinator; C.M. Fitch, RN; J.D. McMillan, Research Assistant; D.R. Schmidt, Research Assistant; M.J. Fritzler, PhD, MD, FRCPC, Professor of Medicine, Faculty of Medicine, University of Calgary; M. Mahler, PhD, Vice-President, Research and Development, Inova Diagnostics Inc
| | - Danielle R Schmidt
- From the Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada; and Inova Diagnostics Inc., San Diego, California, USA.L. Martin, MB, MRCPI, FRCPC, Professor of Medicine; W.A. Steber, BPE, BSc, Clinical Research Manager; T.L. Lupton, RN, Clinical Coordinator; C.M. Fitch, RN; J.D. McMillan, Research Assistant; D.R. Schmidt, Research Assistant; M.J. Fritzler, PhD, MD, FRCPC, Professor of Medicine, Faculty of Medicine, University of Calgary; M. Mahler, PhD, Vice-President, Research and Development, Inova Diagnostics Inc
| | - Marvin J Fritzler
- From the Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada; and Inova Diagnostics Inc., San Diego, California, USA.L. Martin, MB, MRCPI, FRCPC, Professor of Medicine; W.A. Steber, BPE, BSc, Clinical Research Manager; T.L. Lupton, RN, Clinical Coordinator; C.M. Fitch, RN; J.D. McMillan, Research Assistant; D.R. Schmidt, Research Assistant; M.J. Fritzler, PhD, MD, FRCPC, Professor of Medicine, Faculty of Medicine, University of Calgary; M. Mahler, PhD, Vice-President, Research and Development, Inova Diagnostics Inc.
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Webb T, Lakos G, Swart A, Gürtler I, Favalli EG, Schioppo T, Mahler M. Clinical evaluation of a novel chemiluminescent immunoassay for the detection of anti-citrullinated peptide antibodies. Clin Chim Acta 2014; 437:161-7. [DOI: 10.1016/j.cca.2014.07.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 07/23/2014] [Accepted: 07/23/2014] [Indexed: 11/29/2022]
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26
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Anti-citrullinated peptide antibodies and rheumatoid factor isotypes in the diagnosis of rheumatoid arthritis: an assessment of combined tests. Clin Chim Acta 2014; 436:237-42. [DOI: 10.1016/j.cca.2014.05.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 05/17/2014] [Accepted: 05/23/2014] [Indexed: 12/31/2022]
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HLA-DRB1 and HLA-DQB1 allele associations in an Albanian patient population with rheumatoid arthritis: correlations with the specific autoantibody markers and inter-population DRB1 allele frequency variability. Rheumatol Int 2014; 34:1065-71. [DOI: 10.1007/s00296-013-2932-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2013] [Accepted: 12/18/2013] [Indexed: 10/25/2022]
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