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Genetic mutations that result in loss-of-function of the protein A20 result in an early-onset autoinflammatory disease-haploinsufficiency of A20 (HA20). The reported clinical presentations of HA20 include a Behcet's disease-like phenotype and a more lupus-like phenotype. We have identified a novel mutation in the gene encoding A20 in a pediatric patient with chronic lymphadenopathy, lupus-like symptoms, and progressive hypogammaglobulinemia. This case illustrates the wide range of clinical symptoms, including immunodeficiency, that can occur in patients with HA20.
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http://dx.doi.org/10.3389/fimmu.2021.629457 | DOI Listing |
Front Pediatr
July 2025
Department of Pediatric Allergy and Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.
Haploinsufficiency of A20 (HA20), caused by mutations, is a rare autoinflammatory syndrome characterized by highly variable, multisystem manifestations that often delay recognition and definitive care. The A20 protein restrains NF-κB-mediated pro-inflammatory signaling; therefore, loss-of-function variants unleash widespread inflammation that can involve virtually any organ. Fewer than 200 cases have been reported worldwide; thus, clinicians have limited phenotype-specific guidance.
View Article and Find Full Text PDFArthritis Rheumatol
August 2025
Department of Internal Medicine, Division of Rheumatology, University of Michigan, Ann Arbor, Michigan, United States.
Objective: Keratinocyte-derived interferon kappa (IFN-κ) is chronically overexpressed in human non-lesional systemic lupus erythematosus (SLE) skin. Recent evidence suggests that epidermal signals instruct the immune system in SLE, but whether epidermal IFN-κ alone is sufficient to drive lupus phenotypes has not been investigated. This study aimed to identify whether epidermal-specific overexpression of Interferon kappa (Ifnk) results in lupus-like cutaneous and systemic inflammation.
View Article and Find Full Text PDFInt J Mol Sci
June 2025
The Rheumatism Research Center, Catholic Research Institute of Medical Science, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea.
Systemic lupus erythematosus (SLE) is a prototypical autoimmune disease that affects various organs, including the kidneys. Despite recent advancements, effective treatment options for renal involvement in SLE remain limited. Rebamipide, originally developed as a gastroprotective agent, has been reported to exert immunomodulatory effects in rheumatic diseases.
View Article and Find Full Text PDFXi Bao Yu Fen Zi Mian Yi Xue Za Zhi
April 2025
Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing 210008, China. *Corresponding author, E-mail:
Objective To explore the effects of S100 calcium-binding protein A9 (S100A9) gene knockout on the phenotype of systemic lupus erythematosus (SLE) in mice and to clarify the role of S100A9 in the pathogenesis of SLE. Methods Ten female C57BL/6 wild-type and S100A9 knockout (S100A9-KO ) mice were selected, with five wild-type and five S100A9-KO B6 mice receiving imiquimod (IMQ) cream to establish SLE mouse model. The other five wild-type and five S100A9-KO B6 mice were treated as control groups by wiping the skin of the right ear with a cotton swab.
View Article and Find Full Text PDFBrain Behav Immun
August 2025
Department of Inflammation & Immunity, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH, USA; Cleveland Clinic Lerner College of Medicine at Case Western Reserve University, Cleveland, OH, USA. Electronic address:
Objective: To investigate the role of Toll-like Receptor 7 (TLR7) in the development of neuropsychiatric lupus (NPSLE) in the B6.Nba2 murine model of SLE.
Methods: TLR7-deficient B6.