Active suppression of intestinal CD4(+)TCRαβ(+) T-lymphocyte maturation during the postnatal period.

Abstract:

:Priming of the mucosal immune system during the postnatal period substantially influences host-microbial interaction and susceptibility to immune-mediated diseases in adult life. The underlying mechanisms are ill defined. Here we show that shortly after birth, CD4 T cells populate preformed lymphoid structures in the small intestine and quickly acquire a distinct transcriptional profile. T-cell recruitment is independent of microbial colonization and innate or adaptive immune stimulation but requires β7 integrin expression. Surprisingly, neonatal CD4 T cells remain immature throughout the postnatal period under homeostatic conditions but undergo maturation and gain effector function on barrier disruption. Maternal SIgA and regulatory T cells act in concert to prevent immune stimulation and maintain the immature phenotype of CD4 T cells in the postnatal intestine during homeostasis. Active suppression of CD4 T-cell maturation during the postnatal period might contribute to prevent auto-reactivity, sustain a broad TCR repertoire and establish life-long immune homeostasis.

journal_name

Nat Commun

journal_title

Nature communications

authors

Torow N,Yu K,Hassani K,Freitag J,Schulz O,Basic M,Brennecke A,Sparwasser T,Wagner N,Bleich A,Lochner M,Weiss S,Förster R,Pabst O,Hornef MW

doi

10.1038/ncomms8725

subject

Has Abstract

pub_date

2015-07-21 00:00:00

pages

7725

issn

2041-1723

pii

ncomms8725

journal_volume

6

pub_type

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