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• W2912508223 abstract "Background: Pentraxin3 (PTX3) is overexpressed in kidneys of patients developing lupus nephritis (LN). Active LN is associated with reduced anti-PTX3 antibodies. However, abnormalities of B cell differentiation against PTX3 have not been characterized in systemic lupus erythematosus (SLE). Objective: Characterization of PTX3-specific (PTX3+) B cells in peripheral blood of SLE patients with or without LN and healthy donors (HD). Patients and Methods: SLE patients without LN, biopsy-proven LN and matched HD were analyzed. Active LN was defined as proteinuria>0.5 g/day or CrCl<60 ml/min/1.73 m2 with active urinary sediment. Peripheral B cells were analyzed for direct PTX3 binding by flow cytometry using PTX3 labeled with cyanine 5 (Cy5) and phycoerythrin (PE). Results: Initially, a flow cytometry based assay to identify PTX3+ B cells was developed by demonstrating simultaneous binding of PTX3-Cy5 and PTX3-PE. Specificity of B cells was validated by blocking experiments using unlabeled PTX3. We could identify circulating PTX3+ B-cells in HD and patients. Notably, LN patients showed a significantly diminished number of PTX3+ B cells (SLE vs. LN p = 0.033; HD vs. LN p = 0.008). This decrease was identified in naïve and memory B cell compartments (naïve: SLE vs. LN p = 0.028; HD vs. LN p = 0.0001; memory: SLE vs. LN p = 0.038, HD vs. LN p = 0.011). Conclusions: Decreased PTX3+ B cells in LN within the naïve and memory compartment suggest their negative selection at early stages of B cell development potentially related to a decreased regulatory function. PTX3+ B cells could candidate for autoantigen-defined regulatory B cells as a striking abnormality of LN patients." @default.
• W2912508223 created "2019-02-21" @default.
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• W2912508223 date "2019-01-25" @default.
• W2912508223 modified "2023-10-16" @default.
• W2912508223 title "Circulating Pentraxin3-Specific B Cells Are Decreased in Lupus Nephritis" @default.
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• W2912508223 doi "https://doi.org/10.3389/fimmu.2019.00029" @default.
• W2912508223 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6355680" @default.
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