Glucagon-like peptide-2 acutely increases proximal small intestinal blood flow in TPN-fed neonatal piglets.
Glucagon-like peptide-2 (GLP-2) is a gut hormone that is secreted in response to enteral feeding and stimulates small intestinal mucosal growth. We have previously shown 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 x kg(-1) x h(-1) (low GLP-2, n = 7 pigs) or 2,000 pmol x kg(-1) x h(-1) (high GLP-2, n = 8 pigs) for 2 h. Compared with 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 five-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%) and stomach (-12%), whereas the spleen and brain were 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.
Stephens
John
J
Gastroenterology, Hepatology and Nutrition Section, U.S.Department of Agriculture-Agricultural Research Service, USA.
Stoll
Barbara
B
Cottrell
Jeremy
J
Chang
Xiaoyan
X
Helmrath
Michael
M
Burrin
Douglas G
DG
D000818:Animals; D001921:Brain / Q000098:blood supply / Q000187:drug effects; D003106:Colon / Q000098:blood supply / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D053767:Glucagon-Like Peptide 2; D004763:Glucagon-Like Peptides / Q000097:blood / Q000494:pharmacology*; D007421:Intestine, Small / Q000098:blood supply* / Q000187:drug effects*; D007668:Kidney / Q000098:blood supply / Q000187:drug effects; D010179:Pancreas / Q000098:blood supply / Q000187:drug effects; D010289:Parenteral Nutrition, Total; D013154:Spleen / Q000098:blood supply / Q000187:drug effects; D013270:Stomach / Q000098:blood supply / Q000187:drug effects; D013552:Swine / Q000502:physiology*
D053767:Glucagon-Like Peptide 2; D004763:Glucagon-Like Peptides