Abstract:
:Previous research on the ontogeny of sodium appetite in the rat has shown that sodium deficit first engenders sodium intake at 12 days of age, whereas direct stimulation of the brain renin--angiotensin system by intracranial injection of renin increases intake of NaCl solution as early as 3 days postnatally. Similar activation of brain angiotensin also increases thirst, so that the specificity of the precocious sodium intake remains undetermined. In this article we report experiments that dissociate neonatal renin-evoked sodium appetite and thirst, and establish the specificity of the appetite. Our findings confirm that sodium appetite can first be discerned at 3 days of age, and show that it rapidly develops until 12 days of age. During this developmental window, renin-evoked sodium appetite is dissociated from thirst because (a) NaCl is preferred to water, (b) the appetite develops faster than thirst, and (c) 3-day-old renin-stimulated pups will avidly lick dry NaCl. These results show that activation of brain angiotensin in the 3-day-old rat pup evokes a precocious and specific sodium appetite.
journal_name
Dev Psychobioljournal_title
Developmental psychobiologyauthors
Leshem M,Del Canho S,Epstein ANdoi
10.1002/dev.420270305subject
Has Abstractpub_date
1994-04-01 00:00:00pages
185-93issue
3eissn
0012-1630issn
1098-2302journal_volume
27pub_type
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