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AJP - Regulatory, Integrative and Comparative Physiology, Vol 264, Issue 3 630-R637, Copyright © 1993 by American Physiological Society
ARTICLES |
G. J. Schwartz, G. Berkow, P. R. McHugh and T. H. Moran
Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
A role for the vagus nerve in the emptying of intragastric nutrients and the gastric inhibitory actions of the brain-gut peptide cholecystokinin (CCK) has been proposed. To directly assess the role of the gastric vagal branches in these actions, we compared the emptying of 5-ml nutrient and nonnutrient gastric loads in male rats in which both branches of the gastric vagus nerves were cut (GVX, n = 7) with emptying in surgical control (n = 8) rats. Gastric emptying of saline was also examined in both groups after intraperitoneal administration of 8 micrograms/kg CCK. In control rats, high osmolarity, low pH, and caloric density all significantly decreased gastric emptying compared with the emptying of physiological saline. In addition, fat (oleic acid) and protein (peptone) loads emptied significantly more slowly than isocaloric carbohydrate (glucose) loads. Gastric branch vagotomy completely blocked the suppression of emptying produced by fat, protein, carbohydrate, and acid loads. In addition, GVX attenuated the ability of hyperosmotic nutrient and nonnutrient loads to inhibit emptying to the same degree, irrespective of their caloric content. Finally, in intact rats, CCK significantly inhibited the emptying of physiological saline, and gastric vagotomy abolished this suppression. Taken together, these results are consistent with the proposals that 1) the controlled emptying of caloric, hyperosmotic, and acidic solutions is dependent on gastric vagal branches, and 2) exogenous CCK relies on an intact vagal pathway in the control of gastric emptying.
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Y. Li, J. Zhu, and C. Owyang Electrical physiological evidence for highand low-affinity vagal CCK-A receptors Am J Physiol Gastrointest Liver Physiol, August 1, 1999; 277(2): G469 - G477. [Abstract] [Full Text] [PDF]
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T. H. Moran, J. B. Wirth, G. J. Schwartz, and P. R. McHugh Interactions between gastric volume and duodenal nutrients in the control of liquid gastric emptying Am J Physiol Regulatory Integrative Comp Physiol, April 1, 1999; 276(4): R997 - R1002. [Abstract] [Full Text] [PDF]
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R. J. Phillips and T. L. Powley Gastric volume detection after selective vagotomies in rats Am J Physiol Regulatory Integrative Comp Physiol, June 1, 1998; 274(6): R1626 - R1638. [Abstract] [Full Text] [PDF]
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G. J. Schwartz and T. H. Moran Duodenal nutrient exposure elicits nutrient-specific gut motility and vagal afferent signals in rat Am J Physiol Regulatory Integrative Comp Physiol, May 1, 1998; 274(5): R1236 - R1242. [Abstract] [Full Text] [PDF]
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J. M. Kaplan, W. H. Siemers, U. Smedh, G. J. Schwartz, and H. J. Grill Gastric branch vagotomy and gastric emptying during and after intragastric infusion of glucose Am J Physiol Regulatory Integrative Comp Physiol, November 1, 1997; 273(5): R1786 - R1792. [Abstract] [Full Text] [PDF]
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