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2012 ; 245
(1
): 113-31
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Innate immune signaling in defense against intestinal microbes
#MMPMID22168416
Kinnebrew MA
; Pamer EG
Immunol Rev
2012[Jan]; 245
(1
): 113-31
PMID22168416
show ga
The gastrointestinal system is a common entry point for pathogenic microbes to
access the inner environment of the body. Anti-microbial factors produced by the
intestinal mucosa limit the translocation of both commensal and pathogenic
microbes across the intestinal epithelial cell barrier. The regulation of these
host defense mechanisms largely depends on the activation of innate immune
receptors by microbial molecules. Under steady-state conditions, the microbiota
provides constitutive signals to the innate immune system, which helps to
maintain a healthy inflammatory tone within the intestinal mucosa and, thus,
enhances resistance to infection with enteric pathogens. During an acute
infection, the intestinal epithelial cell barrier is breached, and the detection
of microbial molecules in the intestinal lamina propria rapidly stimulates innate
immune signaling pathways that coordinate early defense mechanisms. Herein, we
review how microbial molecules shed by both commensal and pathogenic microbes
direct host defenses at the intestinal mucosa. We highlight the signaling
pathways, effector molecules, and cell populations that are activated by
microbial molecule recognition and, thereby, are involved in the maintenance of
homeostatic levels of host defense and in the early response to acute enteric
infection. Finally, we discuss how manipulation of these host defense pathways by
stimulating innate immune receptors is a potential therapeutic strategy to
prevent or alleviate intestinal disease.