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THE MATURATION OF THE CIRCADIAN RHYTHM OF BRAIN NOREPINEPHRINE AND SEROTONIN IN THE RAT Yutaka Asano 1 , Takashi Morozi 1 1Department of Psychiatry and Neurology, Hokkaido University School of Medicine pp.1445-1451
Published Date 1972/11/1
DOI https://doi.org/10.11477/mf.1406203216
  • Abstract
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Changes in the daily rhythm of norepinephrine and serotonin contents in the rat brain were examined for the period ranging from 8-9 to 56-66post-natal days. Both amines showed a common pattern of circadian changes up to day 15-17 exhibiting a peak in the dark and a reduction in the light periods. From day 35-37 on, new and mature forms of circadian rhythm were observed ; norepinephrine demonstrated a peak in the dark and serotonin in the light phases. It was confirmed also that a circadian rhythm of spontaneous motoractivity and accordingly of the sleep-and-wakeful-ness pattern is formed gradually 4 weeks after birth. A hypothesis was suggested that the maturation of the circadian rhythm of brain norepinephrine and serotonin contents is closely related that of spontaneous activity and the sleep-and-wakefulness mechanisms.


Copyright © 1972, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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