Anti-citrullinated Protein Autoantibodies (ACPAs) Archives

Abstract Number: 2250 • ACR Convergence 2025
Clinical and Serological Predictors of Interstitial Lung Disease in Rheumatoid Arthritis: Are Anti-Citrullinated Protein Antibodies Truly Relevant?
Martí Aguilar-Coll¹, Javier Narváez², Montserrat Roig Kim¹, Laia De Daniel Bisbe¹, Pol Maymó-Paituvi¹, Judith Palacios-Olid¹ and Joan Miquel Nolla¹, ¹Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Spain, ²Hospital Universitario de Bellvitge, Barcelona, Spain
Background/Purpose: Evidence on which risk factors predict the development of interstitial lung disease (ILD) in patients with rheumatoid arthritis (RA) is scarce and of low…
Abstract Number: 2248 • ACR Convergence 2025
Elevated Anti-PAD Autoantibodies in a Singaporean Chinese Rheumatoid Arthritis (RA) Cohort with Rheumatoid Factor (RF) and Anti-Citrullinated Protein Antibodies (ACPA) Positivity: A Case-control Exploratory Study
Margaret Ma¹, Khai Pang Leong², ee tzun koh², Preeti Dhanasekaran³, janique peyper⁴, bermet abylova⁴, Anselm Mak³ and Peter Cheung¹, ¹National University Hospital, Singapore, Singapore, ²Tan Tock Seng Hospital, Singapore, Singapore, ³National University of Singapore, Singapore, Singapore, ⁴Standard BioTools, Singapore, Singapore
Background/Purpose: Autoantibody-based biomarkers including ACPA and RF are of established clinical use in rheumatoid arthritis (RA) and are ingrained in international classification criteria. However, other…
Abstract Number: 1701 • ACR Convergence 2025
Gene Editing of HLA-Class II DRB1*04:01 at Position 82 Abrogates Binding of Citrullinated Arthritogenic Peptides and Collagen
Vibha Jha¹, Brian Freed², Niyun Jin¹, Manjula Miglani¹ and Christina Roark², ¹University of Colorado, Aurora, CO, ²Clinimmune Labs Immunology, School of Medicine, Aurora, CO
Background/Purpose: Rheumatoid arthritis (RA) is a chronic autoimmune disease with a strong genetic association to Class II HLA-DRB1*04:01. Presentation of arthritogenic peptides bound to DRB1*04:01…
Abstract Number: 1678 • ACR Convergence 2025
Abatacept in individuals at risk of developing rheumatoid arthritis: results from the Arthritis Prevention in the Pre-clinical Phase of RA with Abatacept Long Term Outcomes (ALTO) Study
Andrew Cope¹, Joana Vasconcelos¹, Marianna Jasenecova², Andrew Filer³, Karim Raza⁴, Sumera Qureshi¹, Maria Antonietta D'Agostino⁵, Iain McInnes⁶, Stefan Siebert⁶, John Isaacs⁷, Arthur Pratt⁸, Benjamin A. Fisher⁹, Christopher Buckley¹⁰, Paul Emery¹¹, Kulveer Mankia¹¹, Pauline Ho¹², MAYA BUCH¹³, Coziana Ciurtin¹⁴, Dirkjan van Schaardenburg¹⁵, Tom Huizinga¹⁶, René Toes¹⁶, Caroline Murphy¹ and A. Toby Prevost¹, ¹King's College London, London, United Kingdom, ²King's College London, London, ³The University of Birmingham, Birmingham, United Kingdom, ⁴University of Birmingham, Birmingham, United Kingdom, ⁵Division of Rheumatology and Clinical Immunology - Università Cattolica del Sacro Cuore, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy, ⁶University of Glasgow, Glasgow, United Kingdom, ⁷Newcastle University, Newcastle upon Tyne, United Kingdom, ⁸University of Newcastle, Newcastle, United Kingdom, ⁹King’s College London, London, UK; Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK, Birmingham, United Kingdom, ¹⁰University of Oxford, Oxford, United Kingdom, ¹¹University of Leeds, Leeds, England, United Kingdom, ¹²The Kellgren Centre for Rheumatology, Manchester Royal Infirmary, Manchester, United Kingdom, ¹³UNIVERSITY OF MANCHESTER, MANCHESTER, United Kingdom, ¹⁴University College London, London, ¹⁵Amsterdam UMC, Amsterdam, Netherlands, ¹⁶Leiden University Medical Center, Leiden, Netherlands
Background/Purpose: Clinical trials aimed at delaying or preventing rheumatoid arthritis (RA) in individuals at risk have been published with variable results. In the APIPPRA study,…
Abstract Number: 0914 • ACR Convergence 2025
Preclinical Expansion of Autoreactive Naive B cells Drives RA onset in ACPA+ individuals
Xiaohao Wu¹, Mengrui Zhang², Orr Sharpe³, V. Michael Holers⁴, Jane Buckner⁵, Gary Firestein⁵, Eddie James⁶, Kevin Deane⁷ and William H. Robinson⁸, ¹Stanford Uniersity, Stanford, ²Stanford University, Stanford, CA, ³Stanford University, Stanford, ⁴University of Colorado Anschutz Medical Campus, Aurora, ⁵Benaroya Research Institute, Seattle, ⁶Benaroya Research Institute, Benaroya Research Institute, ⁷University of Colorado Denver Anschutz Medical Campus, Aurora, CO, ⁸Stanford University, Palo Alto, CA
Background/Purpose: The cellular and molecular mechanisms underlying the progression from anti-citrullinated protein antibody (ACPA) positivity to clinical rheumatoid arthritis (RA) remain poorly understood. Defining these…
Abstract Number: 0833 • ACR Convergence 2025
Sputum Anti-CCP-IgA and NET-Associated Proteins Predict Risk and Timing of the Transition From Systemic Autoimmunity to Classified RA
Timothy Wilson¹, Claudia Lugo², Marie Feser³, Mark Gillespie⁴, Troy Torgerson⁵, Gary Firestein⁶, V. Michael Holers⁷, Kevin Deane⁸ and Kristen Demoruelle⁹, ¹Thomas Jefferson University, Philadelphia, PA, ²University of Colorado, Denver, CO, ³University of Colorado Anschutz Medical Campus, Aurora, CO, ⁴Allen Institute for Immunology, Seattle, WA, ⁵Allen Institute for Immunology, Enumclaw, WA, ⁶University of California, San Diego, San Diego, CA, ⁷University of Colorado Anschutz Medical Campus, Aurora, ⁸University of Colorado Denver Anschutz Medical Campus, Aurora, CO, ⁹University of Colorado Anschutz Medical Campus, Golden, CO
Background/Purpose: The presence of serum anti-CCP-IgG antibodies can predict the future development of clinically evident RA. Neutrophil extracellular trap (NET) formation can be a source…
Abstract Number: 0799 • ACR Convergence 2025
Citrullination of neutrophil serine proteases enhances proteolytic activity, stability and autoantigenicity in Rheumatoid Arthritis
Mario Navarrete Lagos, Ramiza Zaman, Jun Kim, Jeba Atkia Maisha, Hani El-Gabalawy and Liam O'Neil, University of Manitoba, Winnipeg, MB, Canada
Background/Purpose: In Rheumatoid Arthritis (RA), autoantibodies develop against endogenous proteins containing the amino acid citrulline, which results from a post-translational modification of arginine catalyzed by…
Abstract Number: 0471 • ACR Convergence 2025
An Open-label, Randomized, Controlled Phase 1/2 Study to Assess the Safety and Efficacy of KYV-101 Anti-CD19 CAR-T Cell Therapy in Active and Difficult-to-treat ACPA positive Rheumatoid Arthritis: Preliminary Results of the COMPARE Trial
Fredrik Albach¹, Ioanna Minopoulou¹, Artur Wilhelm², Robert Biesen¹, Arnd Kleyer¹, Norman Drzeniek³, Edgar Wiebe⁴, Anja Fleischmann³, Dominic Borie⁵, Vincent Casteleyn³, Tobias Alexander³, Christian Furth⁶, Jan Zernicke³, Burkhard Muche⁷, Sandra Hermann⁴, Pfeil Alexander⁸, Veronika Scholz³, Elpida Phithak³, Olaf Penack⁹, Kamran Movassaghi⁹, Eva Vanessa Schrezenmeier¹⁰, Udo Schneider³, Antonia Busse¹¹, Georg Schett¹², Ulrich Keller¹¹, Lars Bullinger⁹, Gerhard Krönke¹³, Marie Luise Hütter-Krönke¹⁴ and David Simon¹⁵, ¹Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany, Berlin, Germany, ²Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany; Deutsches Rheuma-Forschungszentrum Berlin, Berlin, Germany, Berlin, ³Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany, Berlin, ⁴Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany, Berlin, Berlin, Germany, ⁵Kyverna Therapeutics, Emeryville, CA, ⁶Department of Nuclear Medicine, Charité-Universitätsmedizin Berlin, Berlin, Germany, Berlin, ⁷Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany, ⁸Department of Internal Medicine III, Jena University Hospital - Friedrich Schiller University Jena, Jena, Germany, ⁹Department of Hematology, Oncology and Tumor Immunology, Charité - Universitätsmedizin Berlin, Campus Virchow Klinikum, Berlin, Germany, Berlin, ¹⁰Department of Nephrology, Charité - Universitätsmedizin Berlin, Berlin, Germany, Berlin, ¹¹Department of Hematology, Oncology and Cancer Immunology, Charité - Universitätsmedizin Berlin, Campus Steglitz, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine, Berlin, Germany; German Cancer Consortium (DKTK) partner site Charité Berlin and German Cancer Research Center (DKFZ), Heidelberg, Germany, Berlin, ¹²Uniklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany, Erlangen, Germany, ¹³Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany; Deutsches Rheuma-Forschungszentrum Berlin, Berlin, Germany, Berlin, Berlin, Germany, ¹⁴Department of Hematology, Oncology and Cancer Immunology, Charité - Universitätsmedizin Berlin, Campus Steglitz, Berlin, Germany, Berlin, ¹⁵Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany; Deutsches Rheuma-Forschungszentrum Berlin, Berlin, Germany, Berlin, Germany
Background/Purpose: Rheumatoid Arthritis (RA) is a chronic autoimmune disease characterized by autoreactive B cells that produce anti-citrullinated protein antibodies (ACPA), contributing to sustained synovial inflammation…
Abstract Number: 0078 • ACR Convergence 2025
Citrullinated Serum Albumin Is Not an Autoantigen in Rheumatoid Arthritis
Farheen Sultan Shaikh, cecilia mustelin, Xiaoxing Wang and Tomas Mustelin, University of Washington, Seattle, WA
Background/Purpose: Autoantibodies against citrullinated proteins (ACPAs) are diagnostic of rheumatoid arthritis (RA), an autoimmune disease primarily affecting synovial joints. Proteomic analyses have identified human serum…
Abstract Number: 0073 • ACR Convergence 2025
HLA-DQA1*01:02 Is Associated With IgG Multi-Reactivity With Citrulline-Containing Type II Collagen Epitopes While HLA-DRB*04:01 Is Associated With More Private Reactivity With Citrulline-Containing IgG Epitopes In Rheumatoid Arthritis
S. Janna Bashar¹, Courtney Myhr¹, Adam Titi¹, Zihao Zheng¹ and Miriam Shelef², ¹University of Wisconsin-Madison, Madison, ²University of Wisconsin-Madison, Madison, WI
Background/Purpose: Anti-citrullinated protein antibodies (ACPAs) in rheumatoid arthritis (RA) can be promiscuous, with cross-reactive binding to many antigens containing short motifs, or more private with…
Abstract Number: 0033 • ACR Convergence 2025
Development and Internal Validation of Two Human Leukocyte Antigen Genetic Risk Scores for Predicting Rheumatoid Arthritis Progression and Anti-Citrullinated Protein Antibody-Positivity
Lauren Vanderlinden¹, Jun Inamo², Jennifer Seifert³, V. Michael Holers⁴, Joel Guthridge⁵, Kevin Deane⁶ and Fan Zhang⁷, ¹University of Colorado Anschutz Medical Campus, Monument, CO, ²University of Colorado School of Medicine, Aurora, CO, ³University of Colorado and Oklahoma Medical Research Foundation, Aurora, CO, ⁴University of Colorado, Denver, CO, ⁵Oklahoma Medical Research Foundation, Oklahoma City, OK, ⁶University of Colorado Denver Anschutz Medical Campus, Aurora, CO, ⁷The University of Colorado, Aurora, CO
Background/Purpose: Human leukocyte antigen (HLA) class II genes play a central role in antigen presentation and immune modulation. The shared epitope (SE) region within HLA-DRB1…
Abstract Number: 0046 • ACR Convergence 2024
Impaired Neutrophil Extracellular Trap (NET) Degradation in Rheumatoid Arthritis (RA) and Pre-clinical RA Is Mediated by Anti-NET Antibodies
Jeba Atkia Maisha¹, Alina Sememenko², Jun Kim², Mario Navarrete², XIAOBO MENG¹, Hani El-Gabalawy¹ and Liam O'Neil¹, ¹University of Manitoba, Winnipeg, MB, Canada, ²University of Manitoba, Winnipeg, Canada
Background/Purpose: Rheumatoid Arthritis (RA) begins after a prolonged preclinical phase which is marked by the development of RA antibodies, typically against citrullinated proteins (ACPA). The…
Abstract Number: 2247 • ACR Convergence 2024
Pro-inflammatory Monocytes and CD11c Expression in ACPA Positive Individuals with Arthralgia and Their Associations with Subclinical Synovitis Preceding the Onset of Arthritis
Klára Prajzlerová¹, Olga Kryštufková², Petra Hánová¹, Nora Růžičková², Hana Hulejová¹, Jiří Vencovský², Ladislav Šenolt² and Mária Filková², ¹Institute of Rheumatology, Prague, Czech Republic, ²Institute of Rheumatology and Department of Rheumatology, First Faculty of Medicine, Charles University, Prague, Czech Republic
Background/Purpose: Autoantibodies, e.g., against citrullinated proteins (ACPA), increase the risk of clinical arthritis and can be detected years before rheumatoid arthritis (RA) onset. EULAR's definition…
Abstract Number: 0056 • ACR Convergence 2024
Association of Soluble Immune Checkpoint Proteins with the Risk of Developing RA in ACPA-positive At-risk Individuals
Ryo Motoyama¹, Shohei Nakamura¹, Eisuke Inoue², Hideto Takada³, Masayoshi Harigai⁴ and Yuko okamoto¹, ¹Tokyo Women's Medical University, Tokyo, Japan, ²Showa University, Tokyo, Japan, ³Tokyo Women's Medical University, Denver, CO, ⁴International University of Health and Welfare, Tokyo, Japan
Background/Purpose: ACPA+ individuals without inflammatory arthritis are considered as being in an at-risk state of RA, although further factors are needed to identify individuals with…
Abstract Number: 2671 • ACR Convergence 2024
Subcutaneous Abatacept vs Adalimumab Head-to-Head Comparison in Adults with Early, Dual Seropositive Rheumatoid Arthritis, Positive for the Shared Epitope HLA Class II Risk Alleles, and an Inadequate Response to Methotrexate: Results from a Phase 3 Trial
Michael Weinblatt¹, Paul Emery², Vivian Bykerk³, Andrew Cope⁴, Gerd Burmester⁵, Yoshiya Tanaka⁶, Gustavo Citera⁷, Peter Nash⁸, Quentin Dornic⁹, Sheila Kelly¹⁰ and Michael Maldonado⁹, ¹Brigham and Women's Hospital/ Harvard Medical School, Waban, MA, ²University of Leeds, Leeds, United Kingdom, ³Hospital For Special Surgery, New York, NY, ⁴King's College London, London, United Kingdom, ⁵Department of Rheumatology and Clinical Immunology, Charité – Universitätsmedizin Berlin, Berlin, Germany, ⁶Department of Internal Medicine, University of Occupational and Environmental Health, Kitakyushu, Fukuoka, Japan, ⁷Instituto de Rehabilitación Psicofísica, Buenos Aires, Argentina, ⁸Griffith University, Brisbane, Australia, ⁹Bristol Myers Squibb, Princeton, NJ, ¹⁰Bristol Myers Squibb, Doylestown, PA
Background/Purpose: For patients (pts) early in their RA disease course, with a clinical profile characterized by inadequate response to MTX (MTX-IR), high titers of ACPA…

Abstracts tagged "Anti-citrullinated Protein Autoantibodies (ACPAs)"

Clinical and Serological Predictors of Interstitial Lung Disease in Rheumatoid Arthritis: Are Anti-Citrullinated Protein Antibodies Truly Relevant?

Elevated Anti-PAD Autoantibodies in a Singaporean Chinese Rheumatoid Arthritis (RA) Cohort with Rheumatoid Factor (RF) and Anti-Citrullinated Protein Antibodies (ACPA) Positivity: A Case-control Exploratory Study

Gene Editing of HLA-Class II DRB1*04:01 at Position 82 Abrogates Binding of Citrullinated Arthritogenic Peptides and Collagen

Abatacept in individuals at risk of developing rheumatoid arthritis: results from the Arthritis Prevention in the Pre-clinical Phase of RA with Abatacept Long Term Outcomes (ALTO) Study

Preclinical Expansion of Autoreactive Naive B cells Drives RA onset in ACPA+ individuals

Sputum Anti-CCP-IgA and NET-Associated Proteins Predict Risk and Timing of the Transition From Systemic Autoimmunity to Classified RA

Citrullination of neutrophil serine proteases enhances proteolytic activity, stability and autoantigenicity in Rheumatoid Arthritis

An Open-label, Randomized, Controlled Phase 1/2 Study to Assess the Safety and Efficacy of KYV-101 Anti-CD19 CAR-T Cell Therapy in Active and Difficult-to-treat ACPA positive Rheumatoid Arthritis: Preliminary Results of the COMPARE Trial

Citrullinated Serum Albumin Is Not an Autoantigen in Rheumatoid Arthritis

HLA-DQA101:02 Is Associated With IgG Multi-Reactivity With Citrulline-Containing Type II Collagen Epitopes While HLA-DRB04:01 Is Associated With More Private Reactivity With Citrulline-Containing IgG Epitopes In Rheumatoid Arthritis

Development and Internal Validation of Two Human Leukocyte Antigen Genetic Risk Scores for Predicting Rheumatoid Arthritis Progression and Anti-Citrullinated Protein Antibody-Positivity

Impaired Neutrophil Extracellular Trap (NET) Degradation in Rheumatoid Arthritis (RA) and Pre-clinical RA Is Mediated by Anti-NET Antibodies

Pro-inflammatory Monocytes and CD11c Expression in ACPA Positive Individuals with Arthralgia and Their Associations with Subclinical Synovitis Preceding the Onset of Arthritis

Association of Soluble Immune Checkpoint Proteins with the Risk of Developing RA in ACPA-positive At-risk Individuals

Subcutaneous Abatacept vs Adalimumab Head-to-Head Comparison in Adults with Early, Dual Seropositive Rheumatoid Arthritis, Positive for the Shared Epitope HLA Class II Risk Alleles, and an Inadequate Response to Methotrexate: Results from a Phase 3 Trial