Synovial B cells of rheumatoid arthritis express ZAP-70 which increases the survival and correlates with the inflammatory and autoimmune phenotype

Abstract B cells have acquired an important role in the pathogenesis of rheumatoid arthritis (RA) since B cell depletion allowed to rescue patients poorly responders to TNFα blockers. This study focused on the involvement of ZAP-70 as a bio-marker of B cells immune activation in RA. ZAP-70 expressio...

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Veröffentlicht in:Clinical immunology (Orlando, Fla.) Fla.), 2009-04, Vol.131 (1), p.98-108
Hauptverfasser: Tolusso, Barbara, De Santis, Maria, Bosello, Silvia, Gremese, Elisa, Gobessi, Stefania, Cuoghi, Ilaria, Totaro, Michele C, Bigotti, Giulio, Rumi, Carlo, Efremov, Dimitar G, Ferraccioli, Gianfranco
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container_end_page 108
container_issue 1
container_start_page 98
container_title Clinical immunology (Orlando, Fla.)
container_volume 131
creator Tolusso, Barbara
De Santis, Maria
Bosello, Silvia
Gremese, Elisa
Gobessi, Stefania
Cuoghi, Ilaria
Totaro, Michele C
Bigotti, Giulio
Rumi, Carlo
Efremov, Dimitar G
Ferraccioli, Gianfranco
description Abstract B cells have acquired an important role in the pathogenesis of rheumatoid arthritis (RA) since B cell depletion allowed to rescue patients poorly responders to TNFα blockers. This study focused on the involvement of ZAP-70 as a bio-marker of B cells immune activation in RA. ZAP-70 expression in synovial fluid (SF) B cells obtained from RA patients was increased compared to SF B cells of osteoarthritis (OA) patients. Moreover we found that ZAP-70 positive/CD38 positive and ZAP-70 positive/CD5 positive B cells were enriched in SF. The analysis of B cell apoptosis in vitro showed that the percentage of ZAP-70 negative B cells spontaneously undergoing apoptosis was significantly higher than ZAP-70 positive B cells. The ZAP-70 positive B cell ratio (SF/peripheral blood (PB)) showed a positive correlation with SF autoantibody levels and with local levels of BAFF and IL6. ZAP-70 positive B cells seem to define a subset characterized by increased survival and high relationship with local inflammation and autoimmunity.
doi_str_mv 10.1016/j.clim.2008.11.011
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This study focused on the involvement of ZAP-70 as a bio-marker of B cells immune activation in RA. ZAP-70 expression in synovial fluid (SF) B cells obtained from RA patients was increased compared to SF B cells of osteoarthritis (OA) patients. Moreover we found that ZAP-70 positive/CD38 positive and ZAP-70 positive/CD5 positive B cells were enriched in SF. The analysis of B cell apoptosis in vitro showed that the percentage of ZAP-70 negative B cells spontaneously undergoing apoptosis was significantly higher than ZAP-70 positive B cells. The ZAP-70 positive B cell ratio (SF/peripheral blood (PB)) showed a positive correlation with SF autoantibody levels and with local levels of BAFF and IL6. 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subjects Allergy and Immunology
Antigens, CD - biosynthesis
Antigens, CD - immunology
Apoptosis - immunology
Arthritis, Rheumatoid - enzymology
Arthritis, Rheumatoid - immunology
Arthritis, Rheumatoid - pathology
Autoantibodies - immunology
B cells
B-Cell Activating Factor - blood
B-Cell Activating Factor - immunology
B-Lymphocytes - enzymology
B-Lymphocytes - immunology
B-Lymphocytes - pathology
BAFF
Biological and medical sciences
Diseases of the osteoarticular system
Female
Flow Cytometry
Fundamental and applied biological sciences. Psychology
Fundamental immunology
Gene Expression
Humans
IL6
Immunohistochemistry
Inflammatory joint diseases
Interleukin-6 - blood
Interleukin-6 - immunology
Male
Medical sciences
Middle Aged
Osteoarthritis - immunology
Reverse Transcriptase Polymerase Chain Reaction
Rheumatoid arthritis
RNA, Messenger - biosynthesis
RNA, Messenger - genetics
Synovial fluid
Synovial Fluid - cytology
Synovial Fluid - immunology
ZAP-70
ZAP-70 Protein-Tyrosine Kinase - biosynthesis
ZAP-70 Protein-Tyrosine Kinase - genetics
ZAP-70 Protein-Tyrosine Kinase - immunology
title Synovial B cells of rheumatoid arthritis express ZAP-70 which increases the survival and correlates with the inflammatory and autoimmune phenotype
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