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Gluten-degrading Enzyme Shows Promise for Treating Celiac Disese

Celiac.com 10/14/2013 - A team of researchers recently set out to assesses the safety and efficacy of Aspergillus niger prolyl endoprotease (AN–PEP) to mitigate the effects of gluten in celiac patients.

Photo: CC--R.VoreFor their study, the researchers included celiac patients with positive serology and subtotal or total villous atrophy on duodenal biopsies, who follow a strict gluten-free diet (GFD) resulting in normalised antibodies and mucosal healing classified as Marsh 0 or I were included.

Prior to this randomized double-blind placebo-controlled pilot study, the team measured complaints, quality-of-life, serum antibodies, immunophenotyping of T-cells and duodenal mucosa immunohistology.

They then had patients consume approximately 7 grams of gluten per day as toast, along with AN-PEP for a two week safety phase. The team put subjects through a two week washout phase where they followed their usual gluten-free diets. The team then randomly assigned 14 patients to receive gluten, with either AN-PEP or placebo, for a two week efficacy phase.

They also collected patient questionnaires on serum and quality of life during and after the safety, washout and efficacy phase. They conducted duodenal biopsies after both the safety phase and the efficacy phase. Change in histological evaluation according to the modified Marsh classification served as the primary endpoint.

In all, 16 adults participated in the study. No serious adverse events occurred during the trial and no patients withdrew during the trial. The average score for the gastrointestinal subcategory of the celiac disease quality (CDQ) was relatively high throughout the study, indicating that AN-PEP was well tolerated.

In the efficacy phase, the team saw no significant deterioration in the CDQ scores of patients consuming gluten with placebo or gluten with AN-PEP, nor did they observe any other differences between the groups. During the efficacy phase, neither the placebo nor the AN-PEP group showed significant antibody titers. IgA-EM concentrations remained negative in both groups.

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The team excluded two patients from entering the efficacy phase because their mucosa showed an increase of two Marsh steps after the safety phase, yet with undetectable serum antibodies. A total of 14 patients were considered histologically stable on gluten with AN-PEP.

Also, after the efficacy phase, the team saw no significant deterioration in immunohistological and flow cytometric evaluation in the group consuming placebo compared to the group receiving AN-PEP.

Furthermore, in four out of seven patients on placebo, IgA-tTG deposit staining increased after two weeks of gluten intake compared to baseline.

In the seven patients receiving AN-PEP, one patient showed increased and one showed decreased IgA-tTG deposits.

AN–PEP appears to be well tolerated. However, the primary endpoint was not met due to lack of clinical deterioration upon placebo, impeding an effect of AN–PEP.

The research team included Greetje J Tack, Jolanda MW van de Water, Chris J Mulder of the Department of Gastroenterology and Hepatology, VU University Medical Centre in Amsterdam, The Netherlands; Engelina MC Kooy-Winkelaar, Jeroen van Bergen, and Frits Koning of the Department of Immunohematology and Blood Transfusion, Leiden University Medical Centre in Leiden, The Netherlands; Petra Bonnet, B Mary E von Blomberg, and Marco WJ Schreurs from the Department of Pathology, VU University Medical Centre, in Amsterdam, The Netherlands; Anita CE Vreugdenhil, with Department of Paediatrics, University Hospital Maastricht in Maastricht, The Netherlands; and Ilma Korponay-Szabo, with the Department of Paediatrics, University of Debrecen in Hungary, and the Paediatric Research Centre, University of Tampere, in Tampere, Finland.

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1 Response:

 
Mark
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said this on
23 Oct 2013 11:05:00 AM PDT
Great article!




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Just watch out. I just went to the expo in Schaumburg, IL, and ended up getting glutened. I realized afterward that I ate all these samples thinking they were gluten free, and they weren't. One company was advertising some sugar, and had made some cake, but then I realized.... How do I know if this contains any other ingredients that might have gluten? Did they make it with a blender or utensils that had gluten contamination? Makes me realize the only safe things would be packaged giveaways with gluten free labeling. My fault for not thinking things through. It was just too exciting thinking i could try it all and enjoy without worry.

No fasting required for a celiac blood test unless they were checking your blood glucose levels during the same blood draw.

I wish! I got the flu this winter as well as a couple of colds. I do have 3 lids, the youngest in preschool, so there's always a lot of germs around. Lol

Hey again ? It's a start, but I so wish they'd done the whole panel. Some of us, myself included, test negative to the TTG-IgA. I was positive on the DGP only. I wonder if your insurance will only cover those 2? Regardless, get them done as soon as you can! Do you have a walk in lab where you live? If so, go tomorrow. Then you'll be a step closer to getting answers. Good luck and keep us posted!

I totally agree...this board is awesome! The people on here have been there for me through everything and it has helped so much! I don't think antihistamines would affect the test at all. I take an antihistamine daily as well for horrendous allergies.