Abstract Number: 0987 • ACR Convergence 2025
S-4321, a novel dual-cell bifunctional PD-1:FcγRIIb selective agonist antibody for autoimmune disease, maintains expression of PD-1 on target cells and enhances inhibitory receptor expression on T cells in vivo
Background/Purpose: S-4321 is a novel antibody that agonizes the inhibitory PD-1 checkpoint receptor on T cells without competing for binding with its natural ligand, PD-L1,…Abstract Number: 0911 • ACR Convergence 2025
A Novel FcRn × Albumin Bispecific Antibody Demonstrates Extended Half-life and Deep IgG Reduction in Preclinical Mouse Models
Background/Purpose: Autoimmune diseases such as rheumatoid arthritis, systemic lupus erythematosus, and Sjögren’s syndrome are characterized by elevated levels of pathogenic autoantibodies that drive inflammation. The…Abstract Number: 0907 • ACR Convergence 2025
Cross-Species Cellular Mapping and Humanization of Fcγ Receptors to Advance Antibody Modeling
Background/Purpose: Fc receptors mediate the effector functions of antibodies by linking adaptive and innate immunity. Immunoglobulin G (IgG), the most abundant antibody in circulation and…Abstract Number: 0040 • ACR Convergence 2025
Identification Of A Novel, Expressed, Alternatively Spliced FCER1G Protein That Inhibits Receptor Function
Background/Purpose: The Tyrosine Activation Motif (ITAM)-containing FcRg chain, encoded by FCER1G, non-covalently couples with the immunoglobulin binding receptors, -- FcγRI (CD64), FcγRIIIa (CD16), and FcaRI…Abstract Number: 0041 • ACR Convergence 2025
A genetically determined, serine-based and phosphorylation-dependent molecular switch regulates the inflammatory potential of human IgA
Background/Purpose: Human serum IgA can paradoxically inhibit immune cell activation. Inhibition of such activation, mediated by the inhibitory configuration of the immunoreceptor tyrosine-based activation motif…Abstract Number: 1864 • ACR Convergence 2024
S-4321, a Novel Dual-cell Bidirectional PD-1:FcγRIIb Selective Agonist Antibody for the Treatment of Autoimmune Disease
Background/Purpose: The dysregulation of immune checkpoint receptors on T cells and antigen presenting cells (APCs) drives autoimmunity while receptor agonism is expected to restore immune…Abstract Number: 1978.5 • ACR Convergence 2024
Post-Hoc Analysis of Clinically Relevant Anti-Vaccine Antibodies in Participants with Rheumatoid Arthritis Treated with Nipocalimab
Background/Purpose: Nipocalimab is a fully human, high affinity, aglycosylated, effectorless IgG1 monoclonal antibody designed to selectively block neonatal fragment crystallizable receptor (FcRn), thereby lowering IgG…Abstract Number: 1988 • ACR Convergence 2024
A Randomized, Open-Label Study on the Effect of Nipocalimab on Vaccine Responses in Healthy Participants
Background/Purpose: Nipocalimab is a human IgG1 monoclonal antibody targeting the neonatal Fc receptor (FcRn) that selectively reduces IgG levels without impacting antigen presentation, T- and…Abstract Number: 2254 • ACR Convergence 2024
A Phase 1 Single Ascending Dose Study to Evaluate the Safety and Pharmacokinetics of ZB004, a CTLA-4-Ig Fusion Protein Designed for Increased Binding Affinity and Extended Half-life, in Healthy Volunteers
Background/Purpose: ZB004 is a bioengineered cytotoxic T-lymphocyte-associated antigen 4 ‑immunoglobulin (CTLA-4-Ig) fusion protein. Its mechanism of action is selective inhibition of T lymphocyte (T cell)…Abstract Number: 2527 • ACR Convergence 2024
Efficacy and Safety of Nipocalimab, an Anti-FcRn Monoclonal Antibody, in Primary Sjogren’s Disease: Results from a Phase 2, Multicenter, Randomized, Placebo-Controlled, Double-Blind Study (DAHLIAS)
Background/Purpose: Sjögren’s disease (SjD) is a chronic, systemic autoimmune disease characterized by the presence of specific autoantibodies (AAb) and lymphocytic infiltration of exocrine glandular tissues.…Abstract Number: 0006 • ACR Convergence 2024
NX-5948, a Clinical-Stage BTK Degrader, Achieves Deep Suppression of BCR, TLR, and FcR Signaling in Immune Cells and Demonstrates Efficacy in Preclinical Models of Arthritis and Other Inflammatory Diseases
Background/Purpose: Bruton’s tyrosine kinase (BTK) mediates signaling downstream of the B cell receptor (BCR), toll-like receptors (TLRs), and Fc receptors (FcRs). This makes BTK an…Abstract Number: 0808 • ACR Convergence 2024
Confirmation of Second Trimester Trophoblast Transport of Maternal Anti-SSA/Ro52 and 60kD Autoantibodies in Cardiac Neonatal Lupus: Implications for FcRn Blockade
Background/Purpose: The nearly invariant finding of anti-SSA/Ro52/60kD autoantibodies in pregnancies complicated by cardiac neonatal lupus (cardiac-NL), which manifests as fetal atrioventricular block and endocardial fibroelastosis…Abstract Number: 0840 • ACR Convergence 2024
The Platelet Adenosinergic Axis as a Novel Therapeutic Target for Thrombotic APS
Background/Purpose: How to most effectively inhibit antiphospholipid antibodies (aPL)-mediated platelet activation remains incompletely understood. CD73 is an ectoenzyme expressed on the platelet surface that generates…Abstract Number: 1795 • ACR Convergence 2024
Immune Complexes-Mediated Activation of Neutrophils in Systemic Lupus Erythematosus Is Dependent on RNA Recognition by TLR8
Background/Purpose: Neutrophil activation has been implicated to contribute to the systemic lupus erythematosus (SLE) pathogenesis. However, factors and mechanisms promoting neutrophil activation in SLE have…Abstract Number: 0051 • ACR Convergence 2023
CD14+CD64+ Classical Monocytes Are the Main Producers of IL-23 at the Enthesis
Background/Purpose: IL-23 is a key cytokine involved in diseases such as psoriasis, psoriatic arthritis and spondyloarthropathies (SpA) and inflammatory bowel disease.IL-23 is produced by activated…
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