Summary of time-limited events in early life promoting tolerance to gut bacterial antigens. Summary of time-limited events in early life promoting tolerance.

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Presentation transcript:

Summary of time-limited events in early life promoting tolerance to gut bacterial antigens. Summary of time-limited events in early life promoting tolerance to gut bacterial antigens. (Top) Events controlling exposure to bacterial antigens that define phases in early life in mice. Left: DOL0 to DOL10 bacterial antigens are largely not encountered by the gut immune system due to the low abundance of gut bacteria and the inhibition of GAPs by high levels of luminal EGF. Middle: DOL11 to DOL20, luminal EGF levels fall, allowing GAPs to form, and bacterial antigens are encountered by the colonic immune system to induce the development of a population of bacterial antigen-specific Tregs. Right: After weaning, the abundant gut microbiota inhibits colonic GAPs, and the gut immune system has limited encounters with bacterial antigens. (Bottom) Left: The stable population of colonic Tregs that develop in early life persist and can limit effector responses to bacterial antigens encountered later in life during inflammation. Middle: Inhibition of bacterial antigen encounter before weaning does not allow bacterial antigen-specific Treg development and does not restrain inflammatory responses upon encounter of bacterial antigens later in life in the setting of inflammation. Right: Extending bacterial antigen encounter beyond weaning by inappropriately inducing colonic GAPs hampers Treg stability and the ability to restrain effector responses to bacterial antigens when encountered later in life in the setting of inflammation. Kathryn A. Knoop et al. Sci. Immunol. 2017;2:eaao1314 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works