The intestinal peptide transporter PEPT1 has been described as a susceptibility gene in inflammatory bowel diseases (IBD). It was proposed that increased levels of PEPT1 during colonic inflammation could further promote inflammation by the transporters capability to mediate uptake of bacteria-derived peptides. Employing specific antibodies, PEPT1 was detected in epithelial cells of normal distal colon and rectum of mice, rats and humans but not in proximal colon. Colonic PEPT1 was functional. During intestinal inflammation, as studied in four different animal models of IBD and in human intestinal tissue samples obtained from IBD patients, PEPT1 expression levels declined with severity of inflammation and tissue damage. The totality of the data collected, unequivocally demonstrate that PEPT1 is expressed in normal healthy distal colon and that the protein is not associated with the development or severity of intestinal inflammation.
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The intestinal peptide transporter PEPT1 has been described as a susceptibility gene in inflammatory bowel diseases (IBD). It was proposed that increased levels of PEPT1 during colonic inflammation could further promote inflammation by the transporters capability to mediate uptake of bacteria-derived peptides. Employing specific antibodies, PEPT1 was detected in epithelial cells of normal distal colon and rectum of mice, rats and humans but not in proximal colon. Colonic PEPT1 was functional. Du...
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