Abstract
In infant rats, kassinin exerts its antidipsogenic effect in the very early stages of neonatal life (2nd-3rd day). The inhibition of cell-dehydration drinking appears in rats of 2 days, and attains adult levels in pups of 9 days. Instead, the thirsts induced by suckling deprivation or by intracerebroventricular angiotensin II are inhibited by kassinin precociously (3rd day), but are unaffected by it in rats of 12-15 days. Kassinin also inhibits milk intake very early (3rd day) and this effect also disappears at 12 days of age. The pattern of ontogenetic results described here may be that of a brain kassinin-like tachykinin that, in the course of the development of the neural structures on which it acts, gains potent and selective control of cell-dehydration thirst.
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