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• W2001990936 abstract "1. Acid back-diffusion through a disrupted gastric mucosal barrier is known to increase gastric mucosal blood flow via a neural mechanism. The present study examined how the acid-evoked change in the gastric microcirculation compares with blood flow changes in the left gastric artery, one of the major arteries supplying the stomach, and whether the dilator mediators in the left gastric artery are identical to those in the gastric mucosa. 2. The experiments were performed on rats anaesthetized with urethane. Blood flow in the left gastric artery was measured by the ultrasonic transit time shift technique, and blood flow in the gastric mucosa was assessed by the hydrogen gas clearance method. 3. Gastric acid back-diffusion evoked by perfusion of the stomach with 15% ethanol in 0.15 M HCl increased blood flow in the left gastric artery by a factor of 4.7, which was significantly larger than the 2.9-fold increase in blood flow through the gastric mucosa. Blood pressure and heart rate were not altered appreciably. 4. The acid-evoked hyperaemia in the left gastric artery was left unaltered by atropine and the substance P receptor antagonist RP-67580. 5. The calcitonin gene-related peptide (CGRP) antagonist CGRP (8-37) had no effect on gastric blood flow but prevented the dilator action of CGRP and inhibited the acid-evoked hyperaemia in the gastric mucosa to a larger degree than the hyperaemia in the left gastric artery. 6. Blockade of nitric oxide synthesis by N omega-nitro-L-arginine methyl ester (L-NAME) caused constriction of the left gastric artery and the gastric mucosal microvessels. The acid-evoked vasodilatation in the gastric mucosa was blocked by L-NAME, whereas the dilator response in the left gastric artery was not significantly depressed. 7. The data show that the gastric hyperaemic response to acid back-diffusion results from dilatation of mucosal microvessels and extramural arteries. The dilator mechanisms, however, differ between the two vascular beds. CGRP and nitric oxide are important vasodilator mediators in the gastric mucosa but are of less relevance in the left gastric artery." @default.
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• W2001990936 date "1994-11-01" @default.
• W2001990936 modified "2023-10-17" @default.
• W2001990936 title "Vascular bed-dependent roles of the peptide CGRP and nitric oxide in acid-evoked hyperaemia of the rat stomach." @default.
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• W2001990936 doi "https://doi.org/10.1113/jphysiol.1994.sp020385" @default.
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