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  • Title: Circadian rhythms of vasopressin content in the suprachiasmatic nucleus of the rat.
    Author: Tominaga K, Shinohara K, Otori Y, Fukuhara C, Inouye ST.
    Journal: Neuroreport; 1992 Sep; 3(9):809-12. PubMed ID: 1421139.
    Abstract:
    The suprachiasmatic nucleus (SCN) of the anterior hypothalamus contains a circadian pacemaker in mammals. We determined the circadian profiles of arginine-vasopressin (AVP), a major peptide in the dorsomedial SCN, in rats under light-dark (LD), constant dark (DD) and constant light (LL) conditions. Under LD conditions, AVP levels in the SCN showed circadian rhythmicity with a peak at early light phase and a broad trough during the dark phase. This rhythm in the AVP contents was maintained even after 14 days of free-running under DD conditions and 3 days under LL conditions. These circadian patterns of AVP are similar to those of somatostatin, another peptide in the dorsomedial SCN. This indicates a common mode of regulation for peptides in this subfield of the SCN.
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