Celiac.com 08/10/2012 - A diagnosis of Celiac disease is measured mainly by an adverse response to gluten, yet there is very little in the way of data regarding gluten challenge in adults on a gluten-free diet.

Photo: CC--rprataA research team recently studied the kinetics of histological, serological, and symptomatic responses to gluten challenge in adults with celiac disease.

The research team included D. Leffler, D. Schuppan, K. Pallav, R. Najarian, J.D. Goldsmith, J. Hansen, T. Kabbani T, M. Dennis, and C.P. Kelly. They are affiliated with Beth Israel Deaconess Medical Center in Boston, Massachusetts.

For their study, the team wanted to address a lack of data regarding the kinetics of responses to gluten, which causes assessment issues in clinical practice and research when gluten-challenge is performed.

For their study, the researchers recruited twenty adults with biopsy-proven coeliac disease. For each participant, the team conducted two run-in visits followed by a 14-day gluten-challenge at a randomly assigned dose of 3 or 7.5 g of gluten/day.

Patients visited study team doctors at 3, 7, 14 and 28 days after the start of their gluten challenge.

The researchers performed duodenal biopsy during the run-in and at days 3 and 14 of gluten challenge.

The team used two pathologists to measure villous height to crypt depth ratio (Vh:Cd) and intraepithelial lymphocyte (IEL) count/100 enterocytes. Upon each visit, the team also assessed antibodies to tissue transglutaminase and deamidated gliadin peptides, lactulose to mannitol ratio (LAMA) and any physical symptoms.

Compared to the initial data, results after 14 days showed substantially lower Vh:Cd (2.2-1.1, p

Interestingly, gastrointestinal symptoms increased significantly after three days, but had returned to baseline by day 28. There were no differences between the higher and lower gluten doses.

The team concludes by noting that a 14-day gluten challenge at or above 3 g of gluten/day triggers cellular, tissue, and blood changes in most adults with celiac disease.

These findings will help researchers create more accurate clinical trials, and show that many individuals will meet celiac diagnostic criteria after a basic 2-week gluten challenge.

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