The Journal of Immunology, Vol 157, Issue 5 1833-1839, Copyright © 1996 by American Association of Immunologists

ARTICLES

Analysis of low zone tolerance induction in normal and B cell-deficient mice

AM Baird and DC Parker
Department of Molecular Genetics, University of Massachusetts Medical Center, Worcester 01655, USA.

To investigate the role of B cells as APCs in acquired tolerance induced by low dose soluble protein Ags, normal and B cell-deficient adult mice were injected i.v. with repeated low doses (10 microgram) of deaggregated OVA, then challenged with OVA in CFA. In animals treated with deaggregated OVA, the in vitro proliferative responses of lymph node T cells to OVA were significantly reduced, and production of the Th1 cytokine, IFN-gamma, in response to OVA was reduced to undetectable levels. This occurred in both normal and B cell-deficient treated animals. B cells were also unnecessary for self tolerance of T cells to the transgenic self Ag, hen egg lysozyme, in a strain with a very low serum lysozyme concentration. Partial low zone tolerance induced by deaggregated, low dose OVA was selective for T cell responses as measured by in vitro proliferation and IL-2 and IFN-gamma production, because Ab responses of B cell-sufficient mice to this T cell-dependent Ag were largely unaffected. Both treated and untreated animals produced equivalent titers of anti-OVA Abs, predominantly of the IgG1 and IgG2b isotypes, following challenge with OVA in CFA.

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