Abstracts tagged "complement"

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…
Abstract Number: 0257 • ACR Convergence 2023
Activity of IgG4-related Disease Differs Depending on the Presence or Absence of Concomitant Hypocomplementemia
Risa Wakiya¹, Hiroki Ozaki², Hiromi Shimada¹, Shusaku Nakashima¹, Taichi Miyagi³, Yusuke Ushio⁴, Koichi Sugihara⁵, Mao Mizusaki¹, Rina Mino⁶, Kanako Chujo⁷, Ryoko Kagawa⁴, Hayamasa Yamaguchi⁴, Tomohiro Kameda¹ and Hiroaki Dobashi¹, ¹Division of Hematology, Rheumatology and Respiratory Medicine, Department of Internal Medicine, Faculty of Medicine, Kagawa University, Kagawa, Japan, ²Department of Rheumatology, KKR Takamatsu Hospital, Kagawa, Japan, ³Division of Hematology, Rheumatology and Respiratory Medicine, Department of Internal Medicine, Faculty of Medicine, Kagawa University, Kidagun, Japan, ⁴Division of Hematology, Rheumatology and Respiratory Medicine, Department of Internal Medicine, Faculty of Medicine, Kagawa University, Miki-cho, Kita-gun, Japan, ⁵Kagawa University, Miki-cho, Kita-gun, Japan, ⁶Kagawa University, Division of Hematology, Rheumatology and Respiratory Medicine, Department of Internal Medicine, Faculty of Medicine, Kagawa, Japan, ⁷Kagawa University, Miki, Kita District, Kagawa, Japan
Background/Purpose: Hypocomplementemia (HC) is often observed in IgG4-related diseases (IgG4-RD), but there are also IgG4-RD without HC. This study aimed to clarify the difference of…
Abstract Number: 0900 • ACR Convergence 2023
Complement Deposition on Extracellular Mitochondria Induces Platelet Activation in Vitro
Marina Barguil Macedo and Christian Lood, University of Washington, Seattle, WA
Background/Purpose: Mitochondria are extruded upon cell death and platelet activation, being elevated in several inflammatory conditions, including systemic lupus erythematosus (SLE). Mitochondria are immunogenic, with…
Abstract Number: 0556 • ACR Convergence 2023
Classical Complement Activation in Lupus Nephritis Correlates with Disease Biomarkers: Results from Two Observational Studies
Edmund Chang¹, Julian Low¹, Noosha Yousefpour¹, Min Bao¹, Jeannette Osterloh¹, Qing Chang¹, Dean Artis¹, Henk-Andre Kroon¹, Yaisa Andrews-Zwilling¹, Maria Dall'Era², Ted Yednock¹ and Ann Mongan¹, ¹Annexon Biosciences, Brisbane, CA, ²University of California San Francisco, San Francisco, CA
Background/Purpose: Lupus nephritis (LN) is an autoantibody-mediated disease that can activate C1q and the classical complement pathway. Pathogenic anti-C1q antibodies (PACAs) are often present, amplifying…
Abstract Number: 0924 • ACR Convergence 2023
Distinct Cell-Bound Complement Activation Products Associate with Disease Activity and Immune Transcriptional Signatures in SLE
Gabriel Arguelles, Lynne Mitchell, Dennis Hourcade, John Atkinson, Elisha Roberson and Alfred Kim, Washington University School of Medicine, St. Louis, MO
Background/Purpose: Complement plays a central role in SLE, generating an array of bioactive soluble and cell-bound complement activation products (CB-CAPs) during disease activity. Data are…
Abstract Number: 0562 • ACR Convergence 2023
HDL-Cholesterol Efflux and the Complement System Are Linked in Systemic Lupus Erythematosus
Ivan Ferraz Amaro¹, Maria García-González¹, Fuensanta Gómez-Bernal¹, Juan Carlos Quevedo-Abeledo², Yolanda Fernández-Cladera¹, Agustín F González-Rivero¹ and Miguel A Gonzalez-Gay³, ¹Hospital Universitario de Canarias, Santa Cruz de Tenerife, Spain, ²Hospital Doctor Negrín, Las Palmas de Gran Canaria, Spain, ³IDIVAL and School of Medicine, UC, Santander; Department of Rheumatology, IIS-Fundación Jiménez Díaz, Madrid, Santander, Spain
Background/Purpose: Cholesterol efflux capacity (CEC), the ability of high-density lipoprotein (HDL) cholesterol to accept cholesterol from macrophages, has been linked to cardiovascular events. Systemic lupus…
Abstract Number: 1591 • ACR Convergence 2023
Complement Factor D/Adipsin Knockout Mice Demonstrate Disparate Pain and Structural Damage Phenotypes in Obesity-induced Post Traumatic Osteoarthritis
Kelsey Collins¹, Kristin Lenz², Arin Oestreich², Luke Springer², Antonina Akk², Huimin Yan², Xiaobo Wu², John Atkinson³, Christine Pham⁴ and Farshid Guilak⁴, ¹University of California San Francisco, San Francisco, CA, ²Washington University in St. Louis, St. Louis, MO, ³Washington University School of Medicine, St. Louis, MO, ⁴Washington University, St. Louis, MO
Background/Purpose: Osteoarthritis (OA) is the leading cause of musculoskeletal pain, which is a primary driver of care-seeking behavior. There is lack of mechanistic information detailing…
Abstract Number: 0565 • ACR Convergence 2023
Insulin Resistance and the Complement System Are Linked in Patients with Systemic Lupus Erythematosus
José María Viotti-Serra¹, Maria García-González¹, Fuensanta Gómez-Bernal¹, Juan Carlos Quevedo-Abeledo², Yolanda Fernández-Cladera¹, Agustín F González-Rivero¹, Miguel A Gonzalez-Gay³ and Ivan Ferraz Amaro¹, ¹Hospital Universitario de Canarias, Santa Cruz de Tenerife, Spain, ²Hospital Doctor Negrín, Las Palmas de Gran Canaria, Spain, ³IDIVAL and School of Medicine, UC, Santander; Department of Rheumatology, IIS-Fundación Jiménez Díaz, Madrid, Santander, Spain
Background/Purpose: Systemic lupus erythematosus (SLE) patients more commonly have insulin resistance (IR) than control subjects. Recent studies have revealed that the complement (C) system is…
Abstract Number: 1605 • ACR Convergence 2023
Complement Activation as a Marker of Thrombosis Risk in Antiphospholipid Antibody Positive Patients: Prospective Results from AntiPhospholipid Syndrome Alliance for Clinical Trials and InternatiOnal Networking (APS ACTION) Clinical Database and Repository (“Registry”)
Cecile Yelnik¹, Shruti Chaturvedi², Julien Labreuche¹, Xiang-Zuo Pan³, H Michael Belmont⁴, Kello Nina⁵, Paul R. Fortin⁶, D. Ware Branch⁷, Yu Zuo⁸, Rohan Willis⁹, Robert Brodsky¹⁰, Jane Salmon¹¹, Maria Laura Bertolaccini¹², Hannah Cohen¹³, Michelle Petri¹⁴, Doruk Erkan¹¹ and On Behalf Of APS ACTION¹⁵, ¹University of Lille, Lille, France, ²Johns Hopkins University School of Medicine, Baltimore, MD, ³John Hopkins University, Baltimore, MD, ⁴NYU School of Medicine, New York, NY, ⁵Northwell Health, Brooklyn, NY, ⁶Centre ARThrite - CHU de Québec - Université Laval, Quebec City, QC, Canada, ⁷University of Utah, Salt Lake City, UT, ⁸University of Michigan, Ann Arbor, MI, ⁹University of Texas Medical Branch, Galveston, TX, ¹⁰Johns Hopkins University, Baltimore, MD, ¹¹Hospital for Special Surgery, New York, NY, ¹²King's College London, London, United Kingdom, ¹³University College London Hospitals NHS Foundation Trust, London, United Kingdom, ¹⁴Department of Medicine, Division of Rheumatology, Johns Hopkins University School of Medicine, Timonium, MD, ¹⁵on behalf of APS ACTION, New York, NY
Background/Purpose: Recent studies implicate complement activation in the pathophysiology of antiphospholipid syndrome (APS), especially in patients with severe manifestations, such as catastrophic APS (CAPS). This…
Abstract Number: 0576 • ACR Convergence 2023
Enhancing Systemic Lupus Erythematosus Diagnosis: Comparative Performance Characteristics of TC4d and Anti-T-Cell Antibodies with Conventional Biomarkers
Andrew Concoff¹, Vasileios Kyttaris², Vaneet Sandhu³, Tyler O'Malley⁴, Giorgio Casaburi⁴, Sudha Kumar⁴, Chau Ching Liu⁵, Susan Manzi⁶ and Joeseph Ahearn⁵, ¹Exagen, Los Angeles, CA, ²BIDMC, Boston, MA, ³Loma Linda University, Loma Linda, CA, ⁴Exagen, Vista, CA, ⁵Allegheny Health Network, Pittsburgh, PA, ⁶Lupus Center of Excellence, Autoimmunity Institute, Allegheny Health Network, Pittsburgh, PA
Background/Purpose: Systemic Lupus Erythematosus (SLE) is a chronic, systemic autoimmune disease, affecting multiple organ systems with varying severity among patients. SLE presents a diagnostic challenge…
Abstract Number: 2273 • ACR Convergence 2023
Predicting SLE Disease Activity with Blood Biomarkers: A Step Towards Precision Medicine
Vasileios Kyttaris¹, Tyler O'Malley², Giorgio Casaburi², Sudha Kumar² and Andrew Concoff³, ¹BIDMC, Boston, MA, ²Exagen, Vista, CA, ³Exagen, Los Angeles, CA
Background/Purpose: Systemic lupus erythematosus (SLE) is the prototypical autoimmune disease with diverse clinical manifestations and variable treatment response. Conventional biomarkers of SLE activityprovide modest correlation…
Abstract Number: 0578 • ACR Convergence 2023
Prospective Observational Study of Microvascular C5b-9 Deposition in Non-lesional Skin in Systemic Lupus Erythematosus Patients and Its Correlation with Active Lupus Nephritis
Meghan Anderson¹, Cynthia Magro² and H Michael Belmont³, ¹New York University, New York, NY, ²Weill Cornell Medicine, New York, NY, ³NYU School of Medicine, New York, NY
Background/Purpose: Tissue damage in LN is mediated by immune complex activation of the classic complement pathway (PMID 23929771). In a study of LN, renal C5b-9…

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