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Am J Physiol Gastrointest Liver Physiol 283: G1310-G1319, 2002. First published August 28, 2002; doi:10.1152/ajpgi.00222.2002
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Vol. 283, Issue 6, G1310-G1319, December 2002

Cephalic phase of acid secretion involves activation of medullary TRH receptor subtype 1 in rats

Vicente Martínez, María Dolores Barrachina, Gordon Ohning, and Yvette Taché

CURE: Digestive Diseases Research Center, Veteran's Affairs Greater Los Angeles Healthcare System, Department of Medicine, Division of Digestive Diseases and Brain Research Institute, School of Medicine, University of California at Los Angeles, Los Angeles, California 90073

Mechanisms involved in the cephalic phase of gastric acid secretion were studied in awake fasted rats with chronic gastric fistula and exposed to the sight and smell of chow for 30 min. Acid secretion was monitored using constant intragastric perfusion and automatic titration. Sham feeding induced a peak acid response reaching 82 ± 7 µmol/10 min within 20 min compared with the average 22 ± 2 µmol/10 min in controls. The sham-feeding response was abolished by intracisternal pretreatment with the TRH1-receptor antisense oligodeoxynucleotides or subcutaneous injection of atropine, whereas TRH1 mismatch oligodeoxynucleotides had no effect. Serum gastrin was not altered by the sham feeding and increased by refeeding. Gastrin antibody did not block the rise in acid during sham feeding, although the net acid response was reduced by 47% compared with the control group. Glycine-gastrin antibody, indomethacin and nitro-L-arginine methyl ester had no effect. Atropine and gastrin antibody decreased basal acid secretion by 98 and 75%, respectively, whereas all other pretreatments did not. These results indicate that the cholinergic-dependent acid response to sham feeding is mediated by brain medullary TRH1 receptors in rats.

gastrin; atropine; nitro-L-arginine methyl ester, indomethacin; glycine-gastrin antibody; antisense oligodeoxynucleotides; 2-deoxy-D-glucose; histamine


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[Abstract] [Full Text] [PDF]


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