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Gastrointestinal Research Group, University of Calgary, Calgary, Alberta, Canada T2N 4N1
The BB rat spontaneously develops autoimmune
diabetes. Feeding these animals a hydrolyzed casein diet significantly
reduces the incidence of this disease, suggesting that a dietary
antigen is involved in the pathogenesis of this disease. In other
syndromes associated with luminal antigens, including celiac and
Crohn's disease, increased intestinal permeability has been suggested to play an etiological role. Therefore, the objective of this study was
to evaluate whether increased permeability was also present in BB rats
before disease development. By measuring gastrointestinal permeability,
in animals on a regular or hydrolyzed casein diet, we were able to
demonstrate that increased gastric and small intestinal permeability
appeared before the development of both insulitis and clinical
diabetes. Although hydrolysis of dietary protein significantly reduced
the incidence of diabetes, it did not alter the small intestinal
permeability abnormality, suggesting that this is an early event.
Increased permeability appears to have an early role in the genesis of
several immunological diseases and may represent a common event in
these diseases.
antigen delivery; Crohn's disease; celiac disease
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