title: Modulation of the immune response by probiotic strains in a mouse model of gluten sensitivity.
abstract: Probiotic strains play an important role in modulating activities in the gut-associated lymphoid tissue. Elucidation of the mechanisms that mediate probiotic-driven immunomodulation may facilitate their therapeutic application for specific immune-mediated diseases or for prophylaxis. In this study, we explored the effect of different Lactobacillus spp. and Bifidobacterium lactis in transgenic mice expressing the human DQ8 heterodimer, a HLA molecule linked to Celiac Disease (CD). In vitro analysis on immature bone marrow-derived dendritic cells (iBMDCs) showed that all strains up-regulated surface B7-2 (CD86), indicative of DC maturation, however, with different intensity. No strain induced appreciable levels of IL-10 or IL-12 in iBMDCs, whereas TNF-alpha expression was essentially elicited by Lactobacillus paracasei and Lactobacillus fermentum. Interestingly, these strains were found also to increase the antigen-specific TNF-alpha secretion in vivo, following co-administration of probiotic bacteria in mice mucosally immunized with the gluten component gliadin. Together these findings highlighted the ability of probiotics to exert strain-specific inductive rather than suppressive effects both on the innate and adaptive immunity in a mouse model of food antigen sensitivity.
authors.affiliation: Institute of Food Sciences, CNR, Avellino, Italy.
authors.forename: Rossana
authors.initials: R
authors.lastname: D'Arienzo
authors.forename: Francesco
authors.initials: F
authors.lastname: Maurano
authors.forename: Paola
authors.initials: P
authors.lastname: Lavermicocca
authors.forename: Ezio
authors.initials: E
authors.lastname: Ricca
authors.forename: Mauro
authors.initials: M
authors.lastname: Rossi
mesh_terms: D056704:Adaptive Immunity; D000818:Animals; D002446:Celiac Disease / Q000235:genetics / Q000276:immunology* / Q000628:therapy*; D016207:Cytokines / Q000276:immunology; D003713:Dendritic Cells / Q000276:immunology; D004195:Disease Models, Animal; D005786:Gene Expression Regulation / Q000276:immunology; D005903:Gliadin / Q000276:immunology; D006683:HLA-DQ Antigens / Q000235:genetics; D006801:Humans; D007113:Immunity, Innate; D051379:Mice; D008822:Mice, Transgenic; D019936:Probiotics
chemical_list: D016207:Cytokines; D006683:HLA-DQ Antigens; C109756:HLA-DQ8 antigen; D005903:Gliadin