Abstract
The effects of intracerebroventricular administration of rat atrial natriuretic peptide (rANP-1-28) and porcine brain natriuretic peptide-32 (pBNP-32) on passive and active avoidance behavior and on electroconvulsive shock-induced amnesia were studied in rats. The dose range for both peptides was selected to lie between 0.016 and 0.32 nmol. The two peptides were found to facilitate consolidation of the passive avoidance response, to delay extinction of the active avoidance response, and to prevent electroconvulsive shock-induced amnesia in a similar way. It is suggested that some modulatory functions in the central nervous system of the rat, so far attributed to ANP, may in fact involve a dual control by both ANP and BNP, and there is no difference in the biological activity of the two peptides as far as fear-motivated learning behavior is concerned.
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