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Prolyl-Endopeptidase Enzymes (PEP) Not Practical in the Detoxification of Gliadin Peptides in Celiac Disease
In 1994 I was diagnosed with celiac disease, which led me to create Celiac.com in 1995. I created this site for a single purpose: To help as many people as possible with celiac disease get diagnosed so they can begin to live happy, healthy gluten-free lives. Celiac.com was the first site on the Internet dedicated solely to celiac disease. In 1998 I foundedÂ The Gluten-Free Mall, Your Special Diet Superstore!, and I am the co-author of the book Cereal Killers, and founder and publisher of Journal of Gluten Sensitivity.View all articles by Scott Adams
Celiac.com 09/14/2005 - Researchers have long thought that the resistance of gliadin prolamines to digestive enzymes is a primary contributor to celiac disease—which leads to the intestinal permeability and inflammation in those who are at risk. Taking prolyl-endopeptidase enzymes (PEP) orally has been proposed and explored as a possible treatment for celiac disease (including extensive research done at Stanford Universitys Celiac Sprue Research Foundation – CSRF). In an effort to determine the feasibility of such a treatment, researchers in France conducted both in vitro (outside a living organism) and ex vivo—using biopsy specimens of active celiac disease patients—studies on the effects of PEP on gliadin peptides.
For the in vitro studies the researchers used radio-reverse-phase high-performance liquid chromatography and mass spectrometry to analyze the degradation by PEP of 3H-labeled gliadin peptides 56-88 (33-mer). In the ex vivo studies the researchers added PEP and 3H-peptides together onto the mucosal side of duodenal biopsy specimens that were mounted in Using chambers, and the peptide transport and digestion were analyzed using radio-reverse-phase high-performance liquid chromatography.
The results indicate that in both in vitro and ex vivo studies the gliadin peptides were only partly degraded by 20 mu/ml of PEP. This concentration of PEP decreased the quantity of intact gliadin peptides (31-49 and 56-88) that crossed the intestinal biopsy specimens, but did not prevent the intestinal passage of toxic or immunostimulatory metabolites—for this the researchers determined that PEP concentrations of at least 500 mu/ml for at least 3 hours was required to achieve full detoxification of gliadin peptides, and thus prevent intestinal transport of active fragments—unfortunately this finding virtually eliminates PEP as a possible treatment option for those with celiac disease.
The researchers conclude optimistically, however: "After prolonged exposure to high concentrations of PEP, the amount of immunostimulatory gliadin peptides reaching the local immune system in celiac patients is decreased. These results provide a basis to establish whether such conditions are achievable in vivo (in living organisms)."
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