PMID: 15240662Jul 9, 2004Paper

Role of gut-associated lymphoreticular tissues in antigen-specific intestinal IgA immunity

The Journal of Immunology : Official Journal of the American Association of Immunologists
Masafumi YamamotoHiroshi Kiyono

Abstract

This study assessed the roles of the postnatal lymphotoxin-beta receptor (LTbetaR)-mediated signals in the gut-associated lymphoreticular tissues of mice for subsequent regulation of Ag-specific intestinal IgA responses. Blockade of LTbetaR-dependent events by postnatal administration of the fusion protein of LTbetaR and IgG Fc (LTbetaR-Ig) reduced both the size and numbers of Peyer's patches (PP) without influencing the PP microarchitecture. Interestingly, inhibition of LTbetaR-dependent signaling revealed significant reductions in the formation of follicular dendritic cell clusters in mesenteric lymph nodes (MLN). Furthermore, these postnatal signaling events controlled the development of isolated lymphoid follicles (ILF) because treatment with LTbetaR-Ig eliminated the formation of ILF. LTbetaR-Ig-treated mice with altered microarchitecture of MLN and lacking ILF were still able to produce significant Ag-specific mucosal IgA responses after oral immunization; however, the levels were significantly lower than those seen in control mice. These results imply the importance of ILF for Ag-specific intestinal immunity. However, mice treated with both TNFR55-Ig and LTbetaR-Ig in utero, which lack PP and MLN, but retain intact ILF, ...Continue Reading

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