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Several recent reports describe a role of probiotics as a therapeutic approach for celiac disease (CD). Two undigested A-gliadin peptides, P31-43 and P57-68, are central to CD pathogenesis, inducing an innate and an adaptive immune response, respectively. They enter enterocytes and localize to vesicular compartment to induce their toxic/immunogenics effects. In this article, we tested the effect of probiotic Lactobacillus paracasei (LP) CBA L74 (International Depository Accession Number LMG P-24778), its supernatant and LP-fermented cereals on gliadin peptides, P31-43 and P57-68, entrance in Caco-2 cells. Both LP CBA L74 and its supernatant inhibit P31-43 (intensity of fluorescence; FI: 75%) and P57-68 (FI: 50%) entrance in Caco2 cells, indicating that this biological effect is due to some product included in LP CBA L74 supernatant. This effect was present also after fermentation of cereals. This study describes a novel effect of probiotics in the prevention of undigested gliadin peptides toxic effects.

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