期刊
SCIENCE IMMUNOLOGY
卷 1, 期 3, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciimmunol.aai7732
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资金
- NIH-National Institute of General Medical Sciences [1R01GM103593]
- Robertson Therapeutic Development Fund
- Center for Basic and Translational Research on Disorders of the Digestive System Pilot Award through Leona M. and Harry B. Helmsley Charitable Trust
- Lerner Trust
- David Rockefeller Graduate Program
- Helmsley Graduate Fellowship
Commensal intestinal bacteria can prevent pathogenic infection; however, limited knowledge of the mechanisms by which individual bacterial species contribute to pathogen tolerance has restricted their potential for therapeutic application. We examined how colonization of mice with a human commensal Enterococcus faecium protects against enteric infections. We show that E. faecium improves host intestinal epithelial defense programs to limit Salmonella enterica serotype Typhimurium pathogenesis in vivo in multiple models of susceptibility. E. faecium protection is mediated by a unique peptidoglycan hydrolase, secreted antigen A (SagA), and requires epithelial expression of pattern recognition receptor components and antimicrobial peptides. Ectopic expression of SagA in nonprotective and probiotic bacteria is sufficient to enhance intestinal barrier function and confer tolerance against S. Typhimurium and Clostridium difficile pathogenesis. These studies demonstrate that specific factors from commensal bacteria can be used to improve host barrier function and limit the pathogenesis of distinct enteric infections.
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