[Role of various regulation factors of interrenal gland activity in response to stress in the green frog Rana esculenta L]

Abstract

The effects of an ether stress on the corticosterone levels were studied in variously experimented frogs. The removal of the distal lobe of the pituitary gland, with preservation of the intermediate lobe which contains also ACTH, suppresses, as total hypophysectomy, the increase of corticosterone level observed in normal frogs. The administration of dexamethasone reduces but not suppresses this increase. A second ether stress 20 minutes after the first is effective. The injection of frog plasma treated or not with an corticosteroid adsorbant do not alter the response to stress. These results suggest that modifications of corticosterone level, in some limits, do not disturb the effects of a stress.