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Small bowel resection decreases brush border membrane (BBM) glucose uptake kinetics. Oral epidermal growth factor (EGF) returns net glucose transport across intact tissue to control levels despite persistence of a defect in BBM glucose uptake. The purpose of this study was to examine the effects of resection and EGF treatment on sodium-dependent glucose cotransporter 1 (SGLT-1) expression in distal remnant tissue. New Zealand White rabbits (1 kg) underwent 70% small bowel resection (R). One group of resected animals (R-EGF) received oral EGF (40 microg/kg, days 3-8). Distal remnant tissue was harvested 10 d after surgery, and compared with controls (C). Mucosal SGLT-1 mRNA was measured by Northern blot, BBM SGLT-1 content by Western blot, and villus distribution of SGLT-1 protein and mRNA by immunofluorescence and in situ hybridization. Western blot indicated BBM from both resected and EGF-treated tissue had decreased SGLT-1 content (C, 0.55 +/- 0.04; R, 0.35 +/- 0.04; R-EGF, 0.35 +/- 0.03 trace OD; n = 5; p &lt; 0.05). Northern blot revealed no alterations in mucosal SGLT-1 mRNA content in any group. SGLT-1 protein and mRNA localization in control tissues was characterized by a gradual increase in stain intensity from the base of the villus to the villus tip. Resection altered SGLT-1 protein and mRNA expression along the villus axis with intensity being strongest in the mid-villus region and little expression at the tip of the villus. Oral EGF normalized SGLT-1 protein and mRNA expression to control patterns. Resection alters SGLT-1 protein and mRNA expression along the villus axis, despite no change in total mucosal SGLT-1 mRNA content. EGF normalized villus SGLT-1 protein and mRNA distribution, without altering overall BBM SGLT-1 content or mucosal mRNA levels.

The Effect of Massive Small Bowel Resection and Oral Epidermal Growth Factor Therapy on SGLT-1 Distribution in Rabbit Distal Remnant