Abstract

Commensal bacteria live intimately and in constant dialogue with skin immune cells. Regulating our immune response to these bacteria is critical for skin homeostasis. Using a new murine model to track Staphylococcus epidermidis-specific T cells, we found that colonization during neonatal but not adult life led to S.epidermidis-specific immune tolerance. This tolerance protected against skin inflammation and was mediated by a wave of regulatory T cells entering neonatal skin. These findings provide new insight into how we establish a healthy symbiosis with commensal microbes and highlight avenues for future research to identify novel therapies for inflammatory skin disease.

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