Abstract
Circadian rhythms in locomotor activity, drinking, and pineal serotonin N-acetyltransferase were examined in female rats genetically deficient for vasopressin (Brattleboro strain). Rhythms of Brattleboro rats were compared with rhythms of normal Long-Evans rats, the strain from which Brattleboro rats derived. The suprachiasmatic nucleus, which has been shown to be an important component of central circadian oscillating systems, normally has vasopressin-containing neurons. No vasopressin-containing neurons are demonstrable in Brattleboro rats. The absence of vasopressin from the suprachiasmatic nucleus and the hypothalamoneurohypophysial system does not alter circadian aspects of the behavioral and endocrine rhythms studied. These results indicate that the presence of vasopressin-containing neurons in the suprachiasmatic nucleus is not essential for maintenance of circadian rhythmicity in the rat.
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