Amnesic effect of cycloheximide in the mouse mediated by adrenocortical hormones.

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Abstract
The involvement of adrenocortical hormones in the amnesic effect of cycloheximide was examined in mice. Subcutaneous injection of cycloheximide shortly before a training trial of a passive avoidance task resulted in an amnesia of the avoidance response. However, amnesia was absent in the adrenalectomized animals in which cerebral protein synthesis was suppressed by cycloheximide. Injection of corticosteroids antagonized the amnesic effect, most effecively if the steroids were given immediately after training. The influence of the hormonal treatments upon the amnesic effect was not ascribable to a change in general activity level. The amnesic effect of subcutaneously injected cycloheximide appears to be mediated by hormonal deficiency, and not related to suppression of the cerebral protein synthesis.

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