Abstract
Tight junction (TJ) proteins are integral factors involved in gut barrier function, and therapy with glucagon-like peptide-2 (GLP-2) enhances gut integrity. Our aim was to assess effects of GLP-2 treatment on mRNA expression of 8 TJ complex proteins in the intestine of dairy calves not infected or infected with Eimeria bovis at 11±3d of age. Mucosal epithelium from jejunum, ileum, and cecum was collected at slaughter from Holstein bull calves assigned to 4 groups: noninfected, buffer-treated (n=5); noninfected, GLP-2 treated (n=4); E. bovis-infected, buffer-treated (n=5); and E. bovis-infected, GLP-2-treated (n=4). Infected calves were orally dosed with 100,000 to 200,000 sporulated E. bovis oocysts on d 0; GLP-2-treated calves received 50 µg of GLP-2/kg of body weight subcutaneously twice daily for 10d beginning on d 18; and buffer-treated calves received an equal injection volume of 0.01 M Na bicarbonate buffer. All calves were killed on d 28. The mRNA expression of coxsackie and adenovirus receptor (CXADR), claudins 1, 2, and 4 (CLDN1, CLDN2, and CLDN4), F11 receptor (F11R), junction adhesion molecule 2 (JAM2), occludin (OCLN), and tight junction protein ZO-1 (TJP1) was determined by real-time quantitative PCR. In jejunum an...Continue Reading
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