Commensal Bacteria-Dependent CD8αß+ T Cells in the Intestinal Epithelium Produce Antimicrobial Peptides.
Front Immunol
; 9: 1065, 2018.
Article
en En
| MEDLINE
| ID: mdl-29868024
ABSTRACT
The epithelium of the intestine functions as the primary "frontline" physical barrier for protection from enteric microbiota. Intraepithelial lymphocytes (IELs) distributed along the intestinal epithelium are predominantly CD8+ T cells, among which CD8αß+ IELs are a large population. In this investigation, the proportion and absolute number of CD8αß+ IELs decreased significantly in antibiotic-treated and germ-free mice. Moreover, the number of CD8αß+ IELs was correlated closely with the load of commensal microbes, and induced by specific members of commensal bacteria. Microarray analysis revealed that CD8αß+ IELs expressed a series of genes encoding potent antimicrobial peptides (AMPs), whereas CD8αß+ splenocytes did not. The antimicrobial activity of CD8αß+ IELs was confirmed by an antimicrobial-activity assay. In conclusion, microbicidal CD8αß+ IELs are regulated by commensal bacteria which, in turn, secrete AMPs that have a vital role in maintaining the homeostasis of the small intestine.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Antígenos CD8
/
Linfocitos T CD8-positivos
/
Péptidos Catiónicos Antimicrobianos
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Microbioma Gastrointestinal
/
Mucosa Intestinal
Límite:
Animals
Idioma:
En
Revista:
Front Immunol
Año:
2018
Tipo del documento:
Article
País de afiliación:
China