Vitamin A Deficiency Impairs Induction of Oral Tolerance in Mice

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  • NAKAMOTO Akiko
    Department of Public Health and Applied Nutrition, Institution of Health Bioscience, The University of Tokushima Graduate School
  • SHUTO Emi
    Department of Public Health and Applied Nutrition, Institution of Health Bioscience, The University of Tokushima Graduate School
  • TSUTSUMI Rie
    Department of Public Health and Applied Nutrition, Institution of Health Bioscience, The University of Tokushima Graduate School
  • NAKAMOTO Mariko
    Department of Public Health and Applied Nutrition, Institution of Health Bioscience, The University of Tokushima Graduate School
  • NII Yoshitaka
    Food and Biotechnology Division, Tokushima Prefectural Industrial Technology Center
  • SAKAI Tohru
    Department of Public Health and Applied Nutrition, Institution of Health Bioscience, The University of Tokushima Graduate School

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Oral tolerance is a phenomenon of induction of systemic unresponsiveness to antigens ingested by the oral route and loss of immune response. Studies have shown the importance of vitamin A in oral tolerance in vitro but not in an in vivo experimental model. Therefore, we carried out experiments to determine how vitamin A deficiency affects tolerance induction and the ability of mesenteric lymph node (MLN) CD11c+ cells to induce regulatory T cells (Tregs). Immunological tolerance was induced by oral ovalbumin (OVA) administration in vitamin A-sufficient mice. OVA-specific antibody and cytokine production were significantly reduced. On the other hand, in vitamin A-deficient mice, both OVA-specific antibody and cytokine production were not suppressed by oral OVA administration. Regarding induction of Tregs, the conversion rate of Foxp3+ cells from naïve CD4+ cell by CD11c+ cells was decreased in vitamin A-deficient mice. Our study indicates that vitamin A deficiency causes the breakdown of oral tolerance in vivo.

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