Endocytosis of commensal antigens by intestinal epithelial cells regulates mucosal T cell homeostasis

Mark S. Ladinsky, Leandro P. Araujo, Xiao Zhang, John Veltri, Marta Galan-Diez, Salima Soualhi, Carolyn Lee, Koichiro Irie, Elisha Y. Pinker, Seiko Narushima, Sheila Bandyopadhyay, Manabu Nagayama, Wael Elhenawy, Brian K. Coombes, Ronaldo P. Ferraris, Kenya Honda, Iliyan D. Iliev, Nan Gao, Pamela J. Bjorkman, Ivaylo I. Ivanov

研究成果: Article査読

40 被引用数 (Scopus)

抄録

Commensal bacteria influence host physiology, without invading host tissues. We show that proteins from segmented filamentous bacteria (SFB) are transferred into intestinal epithelial cells (IECs) through adhesion-directed endocytosis that is distinct from the clathrin-dependent endocytosis of invasive pathogens. This process transfers microbial cell wall–associated proteins, including an antigen that stimulates mucosal T helper 17 (T H 17) cell differentiation, into the cytosol of IECs in a cell division control protein 42 homolog (CDC42)–dependent manner. Removal of CDC42 activity in vivo led to disruption of endocytosis induced by SFB and decreased epithelial antigen acquisition, with consequent loss of mucosal T H 17 cells. Our findings demonstrate direct communication between a resident gut microbe and the host and show that under physiological conditions, IECs acquire antigens from commensal bacteria for generation of T cell responses to the resident microbiota.

本文言語English
論文番号eaat4042
ジャーナルScience
363
6431
DOI
出版ステータスPublished - 2019

ASJC Scopus subject areas

  • General

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