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      Efficient degradation of gluten by a prolyl endoprotease in a gastrointestinal model: implications for coeliac disease.

      Gut
      Aspergillus niger, enzymology, Celiac Disease, etiology, Female, Glutens, metabolism, Humans, Male, Models, Immunological, Serine Endopeptidases, physiology, Stomach

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          Abstract

          Coeliac disease is caused by an immune response to gluten. As gluten proteins are proline rich they are resistant to enzymatic digestion in the gastrointestinal tract, a property that probably contributes to the immunogenic nature of gluten. This study determined the efficiency of gluten degradation by a post-proline cutting enzyme, Aspergillus niger prolyl endoprotease (AN-PEP), in a dynamic system that closely mimics the human gastrointestinal tract (TIM system). Two experiments were performed. In the first, a slice of bread was processed in the TIM system with and without co-administration of AN-PEP. In the second, a standard fast food menu was used. Samples of the digesting meals were taken from the stomach, duodenum, jejunum and ileum compartments at time zero until 4 hours after the start of the experiment. In these samples the levels of immunogenic peptides from gliadins and glutenins were assessed by monoclonal antibody-based competition assays, Western blot analysis and proliferation T-cell assays. AN-PEP accelerated the degradation of gluten in the stomach compartment to such an extent that hardly any gluten reached the duodenum compartment. AN-PEP is capable of accelerating the degradation of gluten in a gastrointestinal system that closely mimics in-vivo digestion. This implies that the co-administration of AN-PEP with a gluten-containing meal might eliminate gluten toxicity, thus offering patients the possibility of abandoning (occasionally) their strict gluten-free diet.

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          Author and article information

          Journal
          17494108
          10.1136/gut.2006.111609

          Chemistry
          Aspergillus niger,enzymology,Celiac Disease,etiology,Female,Glutens,metabolism,Humans,Male,Models, Immunological,Serine Endopeptidases,physiology,Stomach

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