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[The hormonal indices of the reactivity of the central links in the hypothalamo-hypophyseal-adrenocortical system of rats during postnatal ontogeny].

Radioimmunological assay has been made of the amount of ACTH in the adenohypophysis and blood plasma in adult male rats as well as in 1, 3, 5, 7, and 20 days old rat puppies 30 minutes after a surgical stress, i. e. cutting the skin at the back of the body. Reliable increase of ACTH level was originally observed in 7-day puppies, whereas in younger animals surgical stress resulted in the decrease of ACTH in the blood. Changes in vasopressin content of the blood and hypophysis exhibit significant variations, but on the whole mainly the decrease was observed in younger animals together with the increase from the 5-7th day of postnatal development of rats. Accumulation of vasopressin was noted in the median eminence after surgical stress in younger animals. The data obtained suggest that the early period of development of the hypothalamo-hypophyseal-adrenocortical system is characterized rather by paradoxal reaction than by non-reactivity, which may be associated with poor neurohormonal transport in the outer zone of the median eminence.