Intestinal commensal bacteria promote T cell hyporesponsiveness and down-regulate the serum antibody responses induced by dietary antigen

Immunology Letters
Masato TsudaShuichi Kaminogawa

Abstract

Colonization of the gut by commensal bacteria modulates the induction of oral tolerance and allergy. However, how these intestinal bacteria modulate antigen-specific T cell responses induced by oral antigens remains unclear. In order to investigate this, we used germ-free (GF) ovalbumin (OVA)-specific T cell receptor transgenic (OVA23-3) mice. Conventional (CV) or GF mice were administered an OVA-containing diet. Cytokine production by CD4(+) cells from spleen (SP), mesenteric lymph nodes (MLN) and Peyer's patches (PP) was evaluated by ELISA, as was the peripheral antibody titer. T cell phenotype was assessed by flow cytometry. CD4(+) cells from the SP and MLN of CV and GF mice fed an OVA diet for 3 weeks produced significantly less IL-2 than the corresponding cells from mice receiving a control diet, suggesting that oral tolerance could be induced at the T cell level in the systemic and intestinal immune systems of both bacterial condition of mice. However, we also observed that the T cell hyporesponsiveness induced by dietary antigen was delayed in the systemic immune tissues and was weaker in the intestinal immune tissues of the GF mice. Intestinal MLN and PP CD4(+) T cells from these animals also produced lower levels of IL...Continue Reading

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