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1 Gastroenterology, Hepatology and Nutrition Section, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
2 USDA-ARS, Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
3 Surgery Section, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
* To whom correspondence should be addressed. E-mail: dburrin{at}bcm.tmc.edu.
GLP-2 is a gut hormone that is secreted in response to enteral feeding and stimulates small intestinal mucosal growth. We previously showed that GLP-2 infusion acutely increases portal venous blood flow in TPN-fed piglets. The aim of this study was to localize the vasoactive effect of GLP-2 within the gastrointestinal tissues and other visceral organs in TPN-fed piglets. Tissue blood flow rates were quantified using fluorescent microsphere deposition in anesthetized TPN-fed piglets given intravenous infusion of GLP-2 at either 500 pmol.kg-1..hr-1 (Low GLP-2, n = 7 pigs) or 2000 pmol.kg-1.hr-1 (High GLP-2, n= 8 pigs) for 2 h. Compared to baseline, the low and the high GLP-2 treatment significantly increased the blood flow rate in the duodenum (+77%) and jejunum (+40% and 80%), respectively, but blood flow to the distal small intestine and colon (-15%) was unchanged or slightly decreased. Baseline mucosal blood flow was 5-fold higher than serosal blood flow; however, high GLP-2 treatment increased serosal (+140%) to a larger degree than mucosal blood flow (+73%). The high GLP-2 dose increased pancreatic flow (+34%), but decreased blood flow in the kidneys (-14%), stomach (-12%), whereas the spleen and brain was unaffected. These findings suggest that the acute GLP-2-mediated stimulation of portal blood flow in TPN-fed piglets occurs principally via increased blood flow through the superior mesenteric artery to the proximal small intestine, a tissue region where the GLP-2R mRNA abundance and trophic GLP-2 effects are greatest.
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