Cyclic AMP and cyclic GMP were measured in glandular stomach of rats subjected to saline administration, cold (4 degrees C), restraint and restraint+cold after 15, 30, 60, 90 and 120 minutes. All animals subjected to restraint+cold had gastric ulceration after 2 hours. A significant but transient decrease in cAMP was observed 15 minutes after restraint+cold. A marked, sustained and significant decrease of cGMP was observed in the same group of animals. It is concluded that it seems unlikely to be a correlation between cAMP and cGMP changes of the stomach and the restraint-induced gastric ulceration.
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