Abstract
The incidence of gastric ulceration induced by acute emotional stress in Wistar rats is 3 times higher than in August rats, and the mean number of gastric ulcers in Wistar rats 6.3-fold surpassed that in August rats. Wistar rats predisposed to stress-induced ulceration displayed suppressed locomotor and exploratory activities in the open field test, while August rats had more stable behavioral patterns and enhanced exploratory activity after stress. Short-term preadaptation to hypobaric hypoxia for 6 days attenuated stress-induced gastric ulceration, whereas long-term adaptation (40 days) aggravated the severity of gastric ulcers in August and Wistar rats. The interstrain differences in stress-induced ulceration persisted after adaptation. The data suggest that these differences are related to genetically determined peculiarities of production and metabolism of NO and glucocorticoids in August and Wistar rats.
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