Normal immunoglobulin G protects against experimental allergic encephalomyelitis by inducing transferable T cell unresponsiveness to myelin basic protein

European Journal of Immunology
A PashovB Bellon

Abstract

Normal human IgG for intravenous use (IVIg), administered intraperitoneally, protected Lewis rats against experimental allergic encephalomyelitis (EAE) induced by immunization with myelin basic protein (MBP). We demonstrate that protection was associated with an acquired unresponsiveness of lymphocytes to MBP and a decreased ability of the cells to produce IL-2, IFN-gamma and TNF-alpha and, to a lesser degree, IL-4 and IL-10, in the presence of the antigen. Lymph node (LN) cells of protected rats failed to passively transfer EAE to naive syngeneic animals. Our observations indicate that, rather than inducing selective immune deviation, IVIg induces preferential MBP unresponsiveness of Th1 cells. Whereas LN and splenic cells of IVIg-treated rats did not proliferate nor secrete IL-2 in the presence of the antigen, proliferation was restored by adding exogeneous recombinant IL-2. In contrast, LN cells of IVIg-treated rats proliferated normally and produced IL-2 in the presence of concanavalin A, indicating the selectivity for MBP of the anergy induced by IVIg when given at the time of immunization with the antigen. Treatment with IVIg also allowed a resistance to the secondary induction of EAE, indicating that IVIg protects from E...Continue Reading

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Citations

Jun 17, 2005·Journal of Neurology·Namita MisraSrini V Kaveri
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