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- W2135012568 abstract "The molecular basis of common variable immunodeficiency (CVID) is unknown. To assess humoral immunity in CVID, we selected 24 patients with early or late onset of disease. X-linked agammaglobulinemia (XLA), X-linked hyper-IgM syndrome (XHIM), and non-XHIM were excluded based on clinical phenotype, assessment of the immune response, presence of Bruton's tyrosine kinase (Btk) in monocytes or platelets, and normal expression of CD40 ligand by activated T cells. The number of circulating B cells was within the normal range or reduced. IgD(-) CD27(+) memory B cells were markedly reduced or absent in all 24 patients and IgD(+) CD27(+) B cells were diminished in 8 patients. Circulating B cells from all 6 patients examined, including CVID patients with IgD(+) CD27(+) cells, failed to undergo somatic hypermutation in immunoglobulin-variable (V)-region genes, similar to cord blood B cells. B cells from CVID patients produced IgM and IgG, but not IgA upon the engagement of Ig receptor and CD40 in the presence of IL-2 and IL-10. B cells from all but 5 patients secreted IgE when stimulated by CD40 crosslinking in the presence of IL-4. The observation of defective memory B cells with abnormal cell marker expression and function demonstrates that naive CVID B cells including those expressing IgD(+) CD27(+), in analogy to cord blood and hyper-IgM syndrome B cells, may be responsible for their failure to differentiate into plasma cells and to produce high-affinity antibodies of different isotypes." @default.
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- W2135012568 date "2002-04-01" @default.
- W2135012568 modified "2023-10-09" @default.
- W2135012568 title "Absence of Memory B Cells in Patients with Common Variable Immunodeficiency" @default.
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- W2135012568 doi "https://doi.org/10.1006/clim.2001.5197" @default.
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