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The gastrointestinal tract comes into direct contact with environmental agents, including bacteria, viruses, and foods. Intestine-specific subsets of immune cells maintain gut homeostasis by continuously sampling luminal antigens and maintaining immune tolerance. CD11c(+)CX3CR1(+) cells sample luminal antigens in the small intestine and contribute to the trafficking of bacteria to lymph nodes under dysbiotic conditions. The molecular mechanisms crucial for the differentiation of CD11c(+)CX3CR1(+) cells remain unclear. Here we demonstrate that the Notch1- or Notch2-Rbpj axis is essential for the development of CD11c(+)CX3CR1(+) cells. In mice in which Rbpj or Notch1 and Notch2 were deleted from CD11c(+) cells, there was a deficit of CD11c(+)CX3CR1(+) cells and an accumulation of CD11c(low)CX3CR1(+) cells. The CD11c(low)CX3CR1(+) cells could not differentiate to CD11c(+)CX3CR1(+) cells, suggesting that CD11c(low)CX3CR1(+) cells represent a lineage distinct from CD11c(+)CX3CR1(+) cells. These data indicate that Notch signaling is essential for lineage fixation of intestinal CD11c(+)CX3CR1(+) cells.

Differentiation of CD11c + CX 3 CR1 + cells in the small intestine requires Notch signaling

Differentiation of CD11c ⁺ CX ₃ CR1 ⁺ cells in the small intestine requires Notch signaling