New analogs of some neurohypophyseal hormones (oxypressin, hydrin, glumitocin, vasotocin) have been synthesized. Experiments with injection of these peptides to rats showed that substitution of C-terminal glycinamide on beta-ethanolamine (glycinol) or ethylamine in 1-deamino-arginine vasotocin resulted in loss of natriuretic but not antidiuretic activity. Analogs of oxypressin and hydrin exhibited neither natriuretic activity nor ability to affect water reabsorption. Glumitocin analog induced renal sodium ion excretion and did not influence potassium ion excretion.
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