Effects of Nitric Oxide Synthase Inhibitor on the Digestive System Measured by Simultaneous Monitoring of Gastric Motility, Gastric Emptying Activity and Postprandial Pancreaticobiliary Secretion in Dogs
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概要
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Relationships between the NO synthase inhibitor and gastric and pancreaticobiliary functions measured simultaneously in the digestive state have been little studied. The aim of this study was to estimate the effect of NO synthase inhibitor on integrated digestive function in conscious dogs. A strain gauge force transducer was implanted on the gastric antrum of 6 mongrel dogs to measure gastric contractile activity and two duodenal cannulas were inserted into the proximal and distal sites to measure the gastric emptying rate and the pancreaticobiliary output into the duodenum using our novel method. Postprandial pancreatic and biliary secretion were presented as amylase and bile acid activity, respectively. Furthermore, a cervical cannula was placed into the superior vena cava as a route for the administration of NO synthase inhibitor, Nω-nitro-L-arginine (L-NNA), at a dose of 2.5 mg/kg-h. In a group given L-NNA, gastric contractile activity after ingestion was significantly enhanced, but the emptying rates of gastric solids and liquids were significantly suppressed in comparison with the control. The mean 0-1 h amylase integrated output was significantly (P<0.05) decreased in comparison with the control, and the mean bile acid integration of 0-1 h output was also significantly (P<0.01) decreased. A possible explanation for this observation is that smaller volumes of nutrient are delivered into the duodenum; however, it could also be that postprandial pancreaticobiliary secretion is inhibited by an alteration of blood flow or by a change in contractions of the sphincter of Oddi after the administration of L-NNA.
- 社団法人 日本実験動物学会の論文
著者
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TANAKA Toshiyuki
Second Department of Surgery, Gunma University Faculty of Medicine
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MIZUMOTO AKIYOSHI
Gastrointestinal Laboratory, Institute or Molecular and Cellular Regulation, Gunma University
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ITOH ZEN
Gastrointestinal Laboratory, Institute or Molecular and Cellular Regulation, Gunma University
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Itoh Z
Gi Laboratories Institute For Molecular And Cellular Regulation Gunma University
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Mizumoto A
Gi Laboratories Institute For Molecular And Cellular Regulation Gunma University
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Tanaka T
Second Department Of Surgery Gunma University Faculty Of Medicine
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Itoh Zen
Gastrointestinal Laboratories, Institute of Endocrinology, Gunma University
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