MUC17 is an Essential Small Intestinal Glycocalyx Component That is Disrupted in Crohn's Disease

Overview

Journal bioRxiv

Date 2024 Feb 26

PMID 38405862

Authors

Elena Layunta

Sofia Javerfelt

Fleur C van de Koolwijk

Molly Sivertsson

Brendan Dolan

Liisa Arike

Sara Thulin

Bruce A Vallance

Thaher Pelaseyed

Affiliations

Soon will be listed here.

Abstract

Crohn's disease (CD) is the chronic inflammation of the ileum and colon triggered by bacteria, but insights into molecular perturbations at the bacteria-epithelium interface are limited. We report that membrane mucin MUC17 protects small intestinal enterocytes against commensal and pathogenic bacteria. In non-inflamed CD ileum, reduced MUC17 levels correlated with a compromised glycocalyx, allowing bacterial contact with enterocytes. deletion in mice rendered the small intestine prone to atypical infection while maintaining resistance to colitis. The loss of Muc17 resulted in spontaneous deterioration of epithelial homeostasis and extra-intestinal translocation of bacteria. Finally, Muc17-deficient mice harbored specific small intestinal bacterial taxa observed in CD. Our findings highlight MUC17 as an essential line of defense in the small intestine with relevance for early epithelial defects in CD.

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