Abstract Number: 2045 • ACR Convergence 2020
Resident Memory T Cells in Synovial Tissue Mediate Arthritis Flares
Background/Purpose: Resident memory T cells (TRM) are site-specific memory T cells that take up long-term residence in peripheral tissues and aid in local immune defense.…Abstract Number: 0302 • ACR Convergence 2020
Longitudinal Study of Acute SLE Flare Reveals Dynamic Changes in Multiple Immune Cell Subsets
Background/Purpose: In SLE, periods of relative quiescence are punctuated by flares in disease activity that can lead to extensive tissue damage and morbidity. Existing studies…Abstract Number: 0844 • ACR Convergence 2020
Rab4A Regulates Glomerulonephritis and Tryptophan Metabolism in Sle1.2.3. Lupus-prone Mice via Recycling of CD98
Background/Purpose: Systemic Lupus Erythematosus (SLE) is an autoimmune disease with an incompletely understood etiology. Previous work has identified Rab4A, a small GTPase responsible for endosomal…Abstract Number: 1415 • ACR Convergence 2020
Murine Roseolovirus Induces Autoimmune Disease and Development of Autoreactive T Cells and Autoantibodies
Background/Purpose: Murine roseolovirus (MRV) is a recently sequenced beta-herpesvirus that is a natural murine pathogen and is genetically highly related to HHV6 and HHV7. The…Abstract Number: 2046 • ACR Convergence 2020
Alterations in Circulating CD4+ T Cell Phenotypes in CCP+ Early RA and CCP+ At-risk Individuals by Mass Cytometry
Background/Purpose: The cyclic citrullinated peptide (CCP) autoantibody is a highly specific and predictive marker for the clinical diagnosis of RA. Elevation in CCP titers can be…Abstract Number: 0426 • ACR Convergence 2020
T-Cell Receptor (TCR) Sequencing Reveals Decreased Diversity and Clonotypic Expansion of T-cells in Relapsing Polychondritis (RP)
Background/Purpose: Relapsing polychondritis (RP) is a rare, systemic inflammatory disease characterized by recurrent inflammation of cartilaginous structures, including the nose/ears, joints, and trachea. The etiology of…Abstract Number: 0947 • ACR Convergence 2020
STING Gain-of-Function in Radio-resistant Cells Supports a Lymphocyte Dependent Auto-inflammatory Lung Disease
Background/Purpose: cGAS-STING is a cytosolic dsDNA sensing pathway whose regulation is vital to immune homeostasis. Pediatric patients with constitutively active STING mutations develop an autoinflammatory…Abstract Number: 1440 • ACR Convergence 2020
The Myeloperoxidase (MPO) Anti-Neutrophilic Cytoplasmic Antibody (ANCA) Binding Epitope, MPO447-459 Induces CD4 T-cell Proliferation in Patients with MPO-ANCA-associated Vasculitis
Background/Purpose: In Myeloperoxidase (MPO) Anti Neutrophilic Cytoplasmic Antibody (ANCA)-Associated Vasculitis (MPO-AAV), murine and human studies suggest that the MPO435-465 region, which includes ANCA-binding MPO447-459, the…Abstract Number: 2047 • ACR Convergence 2020
Synovial CD8 T Cells in Rheumatoid Arthritis Exhibit High Antigen-independent Cytokine Production and Low Cytotoxic Potential
Background/Purpose: T cell-derived pro-inflammatory cytokines are major drivers of RA pathogenesis, and these cytokines have traditionally been attributed to CD4 T cells. However, single-cell RNA-sequencing…Abstract Number: 0449 • ACR Convergence 2020
Cytotoxic T Cells with a Chronic Antigen Exposure Phenotype Drive Immune Checkpoint Inhibitor Sicca
Background/Purpose: Immune checkpoint inhibitors (ICI) have advanced the field of cancer therapeutics. By blocking the negative co-stimulation of T cells, ICI augment the anti-tumor immune…Abstract Number: 0948 • ACR Convergence 2020
Mass Cytometry Reveals Activation Heterogeneity of Circulating Neutrophils in Systemic Lupus Erythematosus
Background/Purpose: Neutrophils are important effector cells in systemic immune-mediated diseases. Neutrophil phenotypes vary depending on their age, maturity, activation state, and local environment; however, differences…Abstract Number: 1443 • ACR Convergence 2020
High-dimensional Analyses of Checkpoint-inhibitor Related Arthritis Synovial Fluid Cells Reveal a Unique, Proliferating CD38hi Cytotoxic CD8 T Cell Population Induced by Type I IFN
Background/Purpose: Checkpoint inhibitors (CI) used to treat cancer frequently trigger immune-related adverse events, including inflammatory arthritis. CI-related arthritis (CIrA) occurs in ~5% of treated patients,…Abstract Number: 0470 • ACR Convergence 2020
Th1 Polarization Defines the T Cell Compartment in the Joints of Oligoarticular Juvenile Idiopathic Arthritis Patients
Background/Purpose: Oligoarticular juvenile idiopathic arthritis (oligo JIA) is defined by limited joint involvement at disease onset. Some children achieve long-term remission while others continue to…Abstract Number: 0972 • ACR Convergence 2020
Mapping Oligoclonally Expanded T Cells Within the Peripheral and Synovial Immune Landscape of Untreated ACPA+ Rheumatoid Arthritis Patients at the Single Cell Level
Background/Purpose: Clonal T cell expansions – some large – have been identified in the peripheral blood (PB) and in synovial tissue (ST) of multiple joints…Abstract Number: 1480 • ACR Convergence 2020
Abatacept for the Treatment of IgG4-Related Disease
Background/Purpose: To assess the efficacy and safety of abatacept (ABA) for the treatment of IgG4-related disease (IgG4-RD). To date, there are no FDA-approved treatments available…