A Glucose Receptive Field of Hepatic Vagal Afferent that Inhibits Gastric Acid Secretion in Rats

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Changes in gastric acid output induced by intra- and extrahepatic portal injections of glucose were examined in the liver using intact and hepatectomized (40 and 66%) rats under general anesthesia. Acid output was decreased in a dose-dependent fashion 3 min after a glucose injection into the intra- and extrahepatic portal vein in the intact liver. The acid decrease was blocked by hepatic branch vagotomy. The aci dresponse induced by the extrahepatic portal injection of glucose was not influenced by lidocaine anesthesia of the extrahepatic portal walls, but was diminished by a 40% hepatectomy, and completely blocked by a 66% hepatectomy. Hepatic branch splanchnicotomy failed to modify the acid response. Plasma glucose levels before and after the portal glucose injection and liver functional parameters in the blood under hepatectomy during the experiments were unchanged. Since it is known that there are no vagal receptors in the hepatic parenchyma, these results suggested that the receptive field of the hepatic vagal afferents which inhibits gastric acid secretion mainly originates in the intrahepatic portal structures.
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