Phase advances of circadian rhythms in somatostatin depleted rats: effects of cysteamine on rhythms of locomotor activity and electrical discharge of the suprachiasmatic nucleus

C. Fukuhara*, S. I.T. Inouye, K. Aoki, T. Hamada, S. Shibata, S. Watanabe

*この研究の対応する著者

研究成果: Article査読

20 被引用数 (Scopus)

抄録

Somatostatin is synthesized in the suprachiasmatic nucleus (SCN), a circadian pacemaker in mammals. To explore the functional significance of somatostatin in the circadian system, we examined rhythms of rat locomotor activity and electrical firing rate of SCN neurons in the brain slice after temporal depletion of somatostatin levels in the SCN. Intraperitoneal administration of cysteamine (200 mg/kg), a somatostatin depletor, significantly reduced somatostatin level in the in vivo SCN 5 min after injection and kept low level as long as 3 to 4 days. This administration, on the other hand, induced significant phase advances of about 51 min in the subsequent free-running rhythm of locomotor activity of the rat. A marked phase advance in the circadian rhythm of firing rate in the SCN was also observed after administration of cysteamine in coronal hypothalamic slices. These persistent phase shifts after administration of a somatostatin depletor may suggest that the change of somatostatin level in the SCN have a feedback influence on the circadian pacemaker.

本文言語English
ページ(範囲)677-685
ページ数9
ジャーナルJournal of Comparative Physiology A
175
6
DOI
出版ステータスPublished - 1994 12月
外部発表はい

ASJC Scopus subject areas

  • 生態、進化、行動および分類学
  • 生理学
  • 動物科学および動物学
  • 行動神経科学

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