Effect of peripherally-injected glucagon-like peptide-1 on gastric mucosal blood flow.
The aim of this study was to investigate the mechanisms involved in the effect of glucagon-like peptide-1 (GLP-1) on the decrease in gastric mucosal blood flow (GMBF) induced by intragastric ethanol. After preparation of the stomach for GMBF recording, a probe was placed to the gastric mucosa and basal GMBF recordings were obtained by a laser Doppler flowmeter after a 30-minute stabilization period. Following GLP-1 (1000 ng/kg; i.p.) injection, 1 ml of absolute ethanol was applied to the gastric chamber and GMBF was recorded continuously during a 30-minute period. GLP-1 (1000 ng/kg; i.p.) prevented the decrease in GMBF induced by ethanol. Nitric oxide (NO) synthase inhibitor L-NAME, (30 mg/kg; s.c.), calcitonine gene-related peptide (CGRP) receptor antagonist CGRP-(8-37) (10 microg/kg; i.p.), and cyclooxygenase inhibitor indomethacin (5 mg/kg; i.p.) all inhibited the GMBF-improving effect of GLP-1. We concluded that, NO, CGRP and prostaglandins may be involved in the effect of peripherally-injected GLP-1 on GMBF reduction induced by intraluminal ethanol.
Isbil-Buyukcoskun
Naciye
N
Uludag University Medical Faculty, Department of Physiology, 16059, Gorukle, Bursa, Turkey. nisbil@uludag.edu.tr
Cam-Etoz
Betul
B
Gulec
Guldal
G
Ozluk
Kasim
K
D000818:Animals; D015740:Calcitonin Gene-Related Peptide / Q000494:pharmacology; D000431:Ethanol / Q000008:administration & dosage / Q000494:pharmacology; D005753:Gastric Mucosa / Q000098:blood supply* / Q000187:drug effects; D052216:Glucagon-Like Peptide 1 / Q000008:administration & dosage / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D007274:Injections, Intraperitoneal; D008297:Male; D009569:Nitric Oxide / Q000378:metabolism; D019001:Nitric Oxide Synthase / Q000378:metabolism; D010446:Peptide Fragments / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D012039:Regional Blood Flow / Q000187:drug effects*; D013997:Time Factors
D010446:Peptide Fragments; C058636:calcitonin gene-related peptide (8-37); D009569:Nitric Oxide; D000431:Ethanol; D052216:Glucagon-Like Peptide 1; D019001:Nitric Oxide Synthase; D015740:Calcitonin Gene-Related Peptide