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Abstract
Background: Since intestinal inflammation is correlated with impaired barrier functions, transgenic HLA-B27/human β2-microglobulin rats that spontaneously develop intestinal inflammation were used to investigate whether onset of inflammation or impaired barrier function was the initial event. Methods: During the age period of 9–14 weeks, transgenic and non-transgenic (control) rats were gavaged weekly with the marker molecules, 51Cr-ethylenediaminetetraacetic acid, 1-deamino-8-D-arginine vasopressin, and albumin, which were quantified in blood or urine. Results: At 12 weeks of age the first signs of inflammation appeared with decreased body weight gain, decreased urine production, and onset of diarrhea. By 14–15 weeks of age all transgenic rats had developed intestinal inflammation, as confirmed by histology and increased myeloperoxidase content, whereas no inflammation was observed in controls. Intestinal passage of the markers did, however, not differ between transgenic and control rats over the studied period. Conclusions: The results suggest that intestinal inflammation precedes altered intestinal barrier function in this inflammation model.