Abstracts tagged "complement"

Abstract Number: 1490 • ACR Convergence 2024
Multi-centered Clinical Validation of T Cell-bound C4d (TC4d) and T Cell Autoantibodies (TIgG and TIgM): Sensitive and Specific Biomarkers of SLE with Enhanced Accuracy Compared to Conventional SLE Tests
Vasileios Kyttaris¹, Andrew Concoff², Touba Warsi³, Sepehr Taghavi³, Sudha Kumar³, Stanley Park³, Abigail Patalinghug³, Christine Schleif³, Brittany Partain⁴, Joseph Ahearn⁵, Nicole Wilson⁶, Chau-Ching Liu⁶, Susan Manzi⁶ and Tyler O'Malley⁷, ¹BIDMC, Boston, MA, ²Exagen, Inc., Los Angeles, CA, ³Exagen, Carlsbad, CA, ⁴Exagen, Boston, MA, ⁵Allegheny Health Network, Wexford, PA, ⁶Allegheny Health Network, Pittsburgh, PA, ⁷Exagen, Vista, CA
Background/Purpose: Conventional SLE diagnostic markers lack sensitivity and are biased towards severe disease, resulting in a subset of clinically ambiguous ANA-positive but specific autoantibody-negative patients.…
Abstract Number: 1607 • ACR Convergence 2024
Low Concentrations of Anti-C5a Complement Receptor Antibodies Are Associated with Relapse in Eosinophilic Granulomatosis with Polyangiitis (EGPA)
Sebastian Klapa¹, Sabrina Arnold², Antje Müller², Andreas Koch³, Anja Staehle⁴, Wataru Kähler³, Harry Heidecke⁵, Gabriela Riemekasten² and Peter Lamprecht², ¹University of Lübeck, Department of Rheumatology and Clinical Immunology, Lübeck, ²University of Lübeck, Department of Rheumatology and Clinical Immunology, Lübeck, Germany, ³Christian-Albrechts-University Kiel, Institute of Experimental Medicine, Kiel, Germany, ⁴University of Lübeck, Department of Rheumatology and Immunology, Lübeck, Germany, ⁵CellTrend GmbH, Luckenwalde, Germany
Background/Purpose: Complement activation has been shown to play an important role in the pathogenesis of the two major anti-neutrophil cytoplasmic autoantibody (ANCA)-associated vasculitis (AAV) variants,…
Abstract Number: 1703 • ACR Convergence 2024
Single Cell and Spatial Transcriptomics Implicate Vascular Cell Orchestration of Inflammatory Changes After Ultraviolet Light Exposure
Rachael Wasikowski¹, Erin Theisen², Jie An³, Lam C. Tsoi¹, Ksenia Anufrieva⁴, Kevin Wei⁵, Johann Gudjonsson⁶ and Keith Elkon³, ¹Michigan, Dept. of Dermatology, Ann Arbor, MI, ²Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, ³University of Washington, Seattle, WA, ⁴BWH, Cambridge, MA, ⁵Brigham and Women's Hospital at Harvard Medical School, Boston, MA, ⁶University of Michigan, Ann Arbor, MI
Background/Purpose: Skin sensitivity to sunlight affects ~70% of systemic lupus erythematosus (SLE). In addition, ultraviolet radiation (UVR) can stimulate systemic disease flares, but how this…
Abstract Number: 2065 • ACR Convergence 2024
Proposed Pathways Involved in the Pathogenesis of Juvenile Dermatomyositis (JDM)
Samantha Coss¹, Danlei Zhou¹, Rabheh Abdul Aziz², Katherine Miller³, Shoghik Akoghlanian⁴, Kyla Driest¹, Edward Oberle¹, Vidya Sivaraman⁵, Charles Spencer⁶, Stacy Ardoin¹ and Chack-Yung Yu⁷, ¹Nationwide Children's Hospital, Columbus, OH, ²University at Buffalo, Buffalo, NY, ³Nationwide Children's Hospital, Institute for Genomic Medicine, Columbus, OH, ⁴Nationwide Children�s Hospital, Columbus, OH, ⁵Nationwide Children's Hospital/ The Ohio State University, Columbus, OH, ⁶University of Mississippi Medical Center, Jackson, MS, ⁷Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, Ohio, OH
Background/Purpose: JDM is an autoimmune disease of skin and muscle. We investigated genetic factors, autoantibodies, and clinical features in JDM.Methods: Subjects came from 2 large…
Abstract Number: 0040 • ACR Convergence 2024
Targeting Complement Factor B (CFB) via a Novel siRNA Therapy (AZD6912) to Treat Inflammatory Arthritis
Gary Sims¹, Mia Collins², Natalie Pursell³, Teneema Kuriakose¹, Fanyi Jiang⁴, Kristi Moore⁵, Lucie Bertrand⁵, Melissa Lasaro⁵, Jessica Neisen⁶, Scott Manetz⁷, Gabriel Wong⁸, Patrick Riley⁵, Iain McInnes⁹, Kyriakos Konstantinidis¹⁰ and David Close⁸, ¹Immunology Biosciences, Research and Early Development, Respiratory and Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Gaithersburg, MD, ²Translational Science and Experimental Medicine, Research and Early Development, Respiratory and Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden, ³Dicerna, Lexington, ⁴Translation and Experimental Medicine, Research and Early Development, Respiratory and Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Cambridge, United Kingdom, ⁵Alexion, AstraZeneca Rare Disease, New Haven, CT, ⁶Translational Science and Experimental Medicine, Research and Early Development, Respiratory and Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Cambridge, United Kingdom, ⁷Clinical Pharmacology and Safety Science, Research and Early Development, Respiratory and Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Gaithersburg, MD, ⁸Early Clinical Development, Research and Early Development, Respiratory and Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Cambridge, United Kingdom, ⁹University of Glasgow, College of Medical Veterinary and Life Sciences, Glasgow, United Kingdom, ¹⁰Projects, Research and Early Development, Respiratory and Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Cambridge, United Kingdom
Background/Purpose: New precision medicine guided therapies targeting alternate disease driving processes are required to improve clinical outcomes in RA. The complement pathway has long been…
Abstract Number: 2177 • ACR Convergence 2024
CD59 Complement Membrane Regulator Deficiency: 12 Years of Clinical and Molecular Follow-up of 29 Patients
Dror Mevorach, Netanel Karbian, Marian Zeibak and Adi Tabib, Hadassah-University Hospital, Jerusalem, Israel
Background/Purpose: We have described in 2013, homozygous CD59-deficient children that manifest with recurrent peripheral neuropathy resembling Guillain-Barré syndrome (GBS), with hemolytic anemia and recurrent strokes.…
Abstract Number: 0045 • ACR Convergence 2024
Proteomic Analysis of the Rheumatoid Arthritis Citrullinome Reveals an Enrichment of Citrullinated Complement Proteins
Khushali Trivedi¹, Clarissa Klenke², Jun Kim¹, Jeba Atkia Maisha², Alina Sememenko¹, XIAOBO MENG², Mario Navarrete¹, Hani El-Gabalawy² and Liam O'Neil², ¹University of Manitoba, Winnipeg, Canada, ²University of Manitoba, Winnipeg, MB, Canada
Background/Purpose: Citrullination is a key physiological process that drives autoantibody formation in Rheumatoid Arthritis (RA). This irreversible post-translational modification of the amino acid arginine is…
Abstract Number: 2230 • ACR Convergence 2024
Relationship Between the Complement System and Serum Lipid Profile in Patients with Rheumatoid Arthritis
Maria Garcia-Gonzalez¹, Fuensanta Gomez-Bernal², Juan Carlos Quevedo-Abeledo³, Miguel Angel Gonzalez-Gay⁴ and ivan Ferraz-Amaro⁵, ¹Hospital Universitario de Canarias, SC Tenerife, Canarias, Spain, ²Hospital Universitario de Canarias, Santa Cruz de Tenerife, Canarias, Spain, ³Hospital Universitario de Gran Canaria Dr Negrín, Las Palmas de GC, Canarias, Spain, ⁴University of Cantabria, Fundación Jimenez Díaz, Madrid, Madrid, Spain, ⁵Rheumatology, Hospital Universitario de Canarias, Santa Cruz de Tenerife, Canarias, Spain
Background/Purpose: The complement system has been linked to the etiopathogenesis of rheumatoid arthritis (RA). Patients with RA exhibit a dysregulated profile of lipid molecules, which…
Abstract Number: 0114 • ACR Convergence 2024
Rare Germline Variants in Complement Regulatory Genes in Antiphospholipid Antibody Positive Patients: Prospective Results from AntiPhospholipid Syndrome Alliance for Clinical Trials and InternatiOnal Networking (APS ACTION) Clinical Database and Repository (“Registry”)
Cécile Yelnik¹, shruti chaturvedi², Julien Labreuche³, Xiang-Zuo Pan², H Michael Belmont⁴, Nina Kello⁵, Paul Fortin⁶, David Branch⁷, Yu Zuo⁸, Rohan Willis⁹, Robert Brodsky², Jane Salmon¹⁰, Maria Laura Bertolaccini¹¹, Hannah Cohen¹², Michelle Petri¹³ and Doruk Erkan¹⁰, and on behalf of APS ACTION, ¹lille university, Lille, France, ²John Hopkins University, Baltimore, MD, ³Lille University Hospital, Lille, France, ⁴NYU Langone Health, New York, NY, ⁵Northwell Health, Brooklyn, NY, ⁶Centre ARThrite - CHU de Québec - Université Laval, Quebec, QC, Canada, ⁷University of Utah and Intermountain Healthcare, Salt Lake City, UT, ⁸University of Michigan, Ann Arbor, MI, ⁹University of Texas Medical Branch, Galveston, TX, ¹⁰Hospital for Special Surgery, New York, NY, ¹¹King's College London, London, United Kingdom, ¹²University College London Hospitals NHS Foundation Trust, London, United Kingdom, ¹³Johns Hopkins University School of Medicine, Timonium, MD
Background/Purpose: We previously reported that markers of complement activation, specifically elevated C4d levels and positive modified HAM (mHAM) test, are associated with a higher risk…
Abstract Number: 2401 • ACR Convergence 2024
A Novel Modeling Approach to Elucidate the Role of Autoantibodies in Complement Activation in SLE
David Pisetsky¹, Yuankang Zhao², Matthew Engelhard³, Amanda Eudy⁴, Philip Tedeschi⁵, Alex Verdone⁵, Megan Clowse⁶, Lisa Criscione-Schreiber², Jayanth Doss³, Mithu Maheswaranathan², Rebecca Sadun³, Kai Sun³ and Jennifer Rogers², ¹Duke University Medical Center, Durham, NC, ²Duke University, Durham, ³Duke University, Durham, NC, ⁴Duke University, Raleigh, NC, ⁵Immunovant, Inc, New York, NY, ⁶Duke University, Chapel Hill, NC
Background/Purpose: In SLE, ANAs can promote pathogenesis by forming immune complexes (ICs) that activate complement. While antibodies to DNA (anti-DNA) are known to be associated…
Abstract Number: 0736 • ACR Convergence 2023
Deciphering Complement System-dependent Cellular Pathways in Human Rheumatoid Arthritis Synovial Tissue Using Large Single-cell Computational Omics
Juan Vargas¹, Ian Mantel², Nirmal Banda¹, Anna Helena Jonsson³, Kevin Wei⁴, Deepak Rao³, Susan Goodman⁵, Kevin Deane¹, The Accelerating Medicines Partnership SLE/RA¹, Jennifer Anolik⁶, Michael Brenner⁴, Soumya Raychaudhuri³, Jennifer Seifert⁷, Michael Holer¹, Laura Donlin⁵ and Fan Zhang⁸, ¹University of Colorado Anschutz Medical Campus, Aurora, CO, ²Weill Cornell Medicine, New York, NY, ³Brigham and Women's Hospital, Boston, MA, ⁴Brigham and Women's Hospital and Harvard Medical School, Boston, MA, ⁵Hospital for Special Surgery, New York, NY, ⁶University of Rochester Medical Center, Rochester, NY, ⁷the Accelerating Medicines Partnership (AMP) RA/SLE Network, Boston, MA, ⁸University of Colorado, Aurora, CO

Background/Purpose: The complement system is a major component of innate immunity and plays a vital role in autoimmune disease pathogenesis. In patients with rheumatoid arthritis…
Abstract Number: 0094 • ACR Convergence 2023
Granzyme K Elicits a New Pathway for Complement Activation in RA Synovium
Anna Helena Jonsson¹, Carlos Donado², Erin Theisen², Dominique Jones¹, Aparna Nathan³, Fan Zhang⁴, Accelerating Medicines Partnership (AMP): RA/SLE¹, Soumya Raychaudhuri¹ and Michael Brenner², ¹Brigham and Women's Hospital, Boston, MA, ²Brigham and Women's Hospital and Harvard Medical School, Boston, MA, ³Harvard Medical School, Boston, MA, ⁴University of Colorado, Aurora, CO
Background/Purpose: T cells are major drivers of rheumatoid arthritis (RA) pathogenesis. While most research has focused on CD4+ T cells, we have found that CD8+…
Abstract Number: 0857 • ACR Convergence 2023
Change in Albuminuria in Patients with ANCA-Associated Vasculitis Treated with Avacopan
Duvuru Geetha¹, Frank Cortazar², alexandre Karras³, Annette Bruchfeld⁴, Huibin Yue⁵, Peter Merkel⁶ and David Jayne⁷, ¹Johns Hopkins University, Baltimore, MD, ²New York Nephrology, Watervliet, NY, ³HEGP - APHP, Paris, France, ⁴Karolinska Institutet, Stockholm, Sweden, ⁵Amgen, Inc., Thousand Oaks, CA, ⁶University of Pennsylvania, Philadelphia, PA, ⁷University of Cambridge, Cambridge, United Kingdom
Background/Purpose: Urinary albumin:creatinine ratio (UACR) is an important biomarker of active glomerulonephritis, a common complication of antineutrophil cytoplasmic autoantibody (ANCA)-associated vasculitis (AAV). In most glomerular…
Abstract Number: 0099 • ACR Convergence 2023
Cell-bound Complement Activation Products in Antiphospholipid Antibody-positive Patients Without Other Systemic Autoimmune Diseases
Doruk Erkan¹, JoAnn Vega¹, Tyler O'Malley² and Andrew Concoff³, ¹Hospital for Special Surgery, New York, NY, ²Exagen, Vista, CA, ³Exagen, Los Angeles, CA
Background/Purpose: Based on animal models, complement activation is part of Antiphospholipid Syndrome (APS) pathogenesis. However, studies investigating complement activation in antiphospholipid antibody (aPL)-positive patients are…
Abstract Number: 0899 • ACR Convergence 2023
Complement Factor I (CFI) Gene Expression by Kidney Tubular Cells Is Increased in Lupus Nephritis Patients with Interstitial Fibrosis and Tubular Atrophy
Shudan Wang¹, John Greally², Masako Suzuki³, Jee-Young Moon², Tao Wang², Yvonne M Saenger², Brad Rovin⁴ and J. Michelle Kahlenberg⁵, ¹Albert Einstein College of Medicine / Montefiore Medical Center, New York, NY, ²Albert Einstein College of Medicine, Bronx, NY, ³Texas A&M University, College Station, TX, ⁴Ohio State University, Columbus, OH, ⁵University of Michigan, Ann Arbor, MI
Background/Purpose: Tubulointerstitial injury is a strong predictor of progression to kidney failure in lupus nephritis (LN). Prior animal studies suggest intrarenal complement activation has an…

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