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Virulence. 2013 Apr 1;4(3):207-12. doi: 10.4161/viru.23354. Epub 2013 Jan 18.

Toll-like receptor signaling and regulation of intestinal immunity.

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1
Department of Microbiology and Immunology, University of Southern California, Keck School of Medicine, Los Angeles, CA, USA.

Abstract

The intestine is a complex organ that must maintain tolerance to innocuous food antigens and commensal microbiota while being also able to mount inflammatory responses against invading pathogenic microorganisms. The ability to restrain tolerogenic responses while permitting inflammatory responses requires communication between commensal bacteria, intestinal epithelial cells and immune cells. Disruption or improper signaling between any of these factors may lead to uncontrolled inflammation and the development of inflammatory diseases. Toll-like receptors (TLR) recognize conserved molecular motifs of microorganisms and, not surprisingly, are important for maintaining tolerance to commensal microbiota, as well as inducing inflammation against pathogens. Perturbations in individual TLR signaling can lead to a number of different outcomes and illustrate a system of regulation within the intestine in which each TLR plays a largely non-redundant role in mucosal immunity. This review will discuss recent findings on the roles of individual TLRs and intestinal homeostasis.

KEYWORDS:

TLR; commensal microbiota; inflammation; intestine; mucosal immunity; tolerance

PMID:
23334153
PMCID:
PMC3711978
DOI:
10.4161/viru.23354
[Indexed for MEDLINE]
Free PMC Article
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