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- W2059919855 abstract "Summary. CLL is typically characterized by acquired hypogammaglobulinemia. We report the case of a female patient suffering from B-CLL who developed polyclonal hypergammaglobulinaemia: 38-3 g/I polyclonal IgG, 0.97g/1 IgA and 0.33 g/1 IgM. Immunophenotyping showed a monoclonal lymphocytic population CD19+ CD5+ CD40+ CD23+, low slg+ (95%), K type in the great majority (96%). RT-PCR of immunoglobulin genes gave evidence of monoclonal rearrangement of the IgM type. Our tests showed that IL-2 was produced when leukaemic B cells were stimulated with phorbol myristate acetate, ionomycin and lipopoly-saccharide. In addition, transfections with the full IL-2 promoter or elements thereof revealed that IL-2 expression is inducible and mediated through the NF-kB-promoter element. Finally, the amount of IL-2 secreted by these cells is about 39ng/ml/106 cells, which is remarkably high for non-T cells. These results suggest that the large amounts of polyclonal IgG seen in this case of B-CLL are secreted by normal B cells which are in turn stimulated by IL-2 produced by proliferating monoclonal (leukaemic) B cells. Under cyclosporin A treatment, immunoglobulin secretion and B cell count remained low." @default.
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- W2059919855 date "1995-10-01" @default.
- W2059919855 modified "2023-09-27" @default.
- W2059919855 title "Polyclonal hypergammaglobulinemia in a case of B-cell chronic lymphocytic leukaemia: the result of IL-2 production by the proliferating monoclonal B cells?" @default.
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- W2059919855 doi "https://doi.org/10.1111/j.1365-2141.1995.tb05301.x" @default.
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