Abstract
The acute administration of anti-digoxin serum (ADS) caused a pronounced long-lasting blood pressure decrease in young DOCA-salt hypertensive rats. The decrease of blood pressure was only moderate in 1K-1C Goldblatt rats while there was no change of blood pressure after the ADS injection in spontaneously hypertensive rats. However, the blockade of endogenous digoxin-like factors lowered blood pressure only in those hypertensive rats which were treated with DOCA-saline from youth but not in animals treated in the same manner only in adulthood. The age period at which salt intake was increased, could be responsible for the susceptibility of animals to salt- and volume-dependent forms of experimental hypertension as well as for the participation of slow acting humoral pressor agents in the induction and/or maintenance of elevated blood pressure. It is evident that endogenous digoxin-like factor(s) participate in a greater response of young rats to the hypertensive stimuli.
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