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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Intravenous immunoglobulin up-regulates the expression of the inhibitory FcgammaIIB receptor on B cells.
Immunology and Cell Biology 2009 October
Intravenous immunoglobulin (IVIg) preparations are known to modulate autoimmune/inflammatory diseases through several F(ab')(2)- and Fc-dependent mechanisms. In this study, we show that the in vitro and the in vivo exposure of B lymphocytes from lupus-prone and from healthy mice to IVIg results in an increased expression of their surface inhibitory FcgammaIIB receptors. Further, this exposure enhanced the ability of a chimeric antibody, cross-linking FcgammaRIIB and immunoglobulin receptors on DNA-specific B lymphocytes, to suppress IgG anti-DNA antibody production. F(ab')(2) fragments of IVIg had a similar activity as the intact preparation, whereas Fc fragments had no effect. This study describes a novel approach with clinical relevance for modulating B lymphocyte activity.
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