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Origin and regulation of intraepithelial CD4+CD8a+ T-cells induction by Segmented Filamentous Bacteria
Pacáková, Iva ; Dobeš, Jan (advisor) ; Štěpánek, Ondřej (referee)
Segmented filamentous bacteria (SFB) are member of mice intestinal microbiota with very unique life strategy involving tight interaction with the host's intestinal epithelium. This association with intestinal epithelial cells (IECs) induces strong immune response characterized by Th17-mediated immune response. However, recent findings revealed that SFB induce also huge accumulation of CD4+ intraepithelial lymphocytes (IELs) by the upregulation of MHCII expression on IECs in an IFN-dependent manner. Likewise to SFB, Lactobacillus reuteri was recently found to have a similar capacity of IELs induction. In contrast to SFB, L.reuteri induces IELs through the activation of the Aryl hydrocarbon receptor (AhR) by its ligands, which originate from the metabolism of tryptophan amino acid. Moreover, L.reuteri cannot induce IELs by itself and needs a complex microbiota for this induction. However, if these two bacteria can cooperate in the induction of IELs remains unknown. This thesis focuses on the interaction of SFB and L.reuteri in the context of IELs induction and investigates the contribution of each bacteria to the IELs phenotype. Data presented in my thesis indicate that SFB induce accumulation of IELs, however, interaction of SFB and L.reuteri induce full cytotoxic activation and vesicle secretion...
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