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• W1569887154 abstract "Summary Autoantibodies inhibiting the activity of the metalloproteinase, ADAMTS13 (a disintegrin and metalloproteinase with a thrombospondin type 1 motif, member 13), underlie the pathogenesis of thrombotic thrombocytopenic purpura (TTP). Rituximab (RTX) combined with plasma-exchange (PEX) is an effective treatment in TTP. Patients can remain in remission for extended periods following PEX/RTX, and this is associated with continuing reduction in antibodies to ADAMTS13. Factors controlling B cell differentiation to autoantibody production, including stimulation through the B cell receptor and interactions with the B cell-activating factor (BAFF), may thus impact length of remission. In this cross-sectional study, we measured naive and memory B cell phenotypes [using CD19/immunoglobulin (Ig)D/CD27] following PEX/RTX treatment in TTP patients at B cell return (n = 6) and in 12 patients in remission 10–68 months post-RTX. We also investigated relationships among serum BAFF, soluble CD23 (sCD23– a surrogate measure of acquiring B memory (CD27+) phenotype) and BAFF receptor (BAFF-R) expression. At B cell return after PEX/RTX, naive B cells predominated and BAFF-R expression was reduced compared to healthy controls (P &lt; 0·001). In the remission group, despite numbers of CD19+ B cells within normal limits in most patients, the percentage and absolute numbers of pre-switch and memory B cells remained low, with sCD23 levels at the lower end of the normal range. BAFF levels were correlated inversely with BAFF-R expression and time after therapy. In conclusion, the long-term effects of RTX therapy in patients with TTP included slow regeneration of memory B cell subsets and persistently reduced BAFF-R expression across all B cell subpopulations. This may reflect the delay in selection and differentiation of potentially autoreactive (ADAMTS13-specific) B cells, resulting in relatively long periods of low disease activity after therapy." @default.
• W1569887154 created "2016-06-24" @default.
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• W1569887154 date "2015-02-16" @default.
• W1569887154 modified "2023-09-27" @default.
• W1569887154 title "Effect of rituximab on B cell phenotype and serum B cell-activating factor levels in patients with thrombotic thrombocytopenic purpura" @default.
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• W1569887154 doi "https://doi.org/10.1111/cei.12472" @default.
• W1569887154 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4337674" @default.
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