The involvement of calmodulin and Ca2+/calmodulin-dependent protein kinase II in the circadian rhythms controlled by the suprachiasmatic nucleus

Tatsuto Fukushima, Takao Shimazoe*, Shigenobu Shibata, Akihito Watanabe, Michiko Ono, Toshiyuki Hamada, Shigenori Watanabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


We investigated the involvement of calmodulin and Ca2+/calmodulin- dependent protein kinase II (CaMKII) in the photic entrainment of circadian rhythms using calmodulin inhibitors such as calmidazolium (CMZ) and trifluoperazine (TFP), and a CaMKII inhibitor, KN-62, in rats. Fos expression in the suprachiasmatic nucleus (SCN) of rats induced by photic stimulation (300 lux, 1 h) during the early subjective night of the rats was inhibited by treatment with CMZ (10 mg/kg i.p.) or TFP (20 mg/kg i.p.) 30 min before photic stimulation. With respect to the neuronal firing rate in the rat SCN slice, KN-62 and CMZ application during the early subjective night attenuated the glutamate (10 μM)-induced phase shift. The present results suggest that calmodulin and CaMKII are involved in the photic entrainment mechanism in the rodent SCN.

Original languageEnglish
Pages (from-to)45-48
Number of pages4
JournalNeuroscience Letters
Issue number1
Publication statusPublished - 1997 May 9


  • Ca/calmodulin-dependent protein kinase II
  • Calmodulin
  • Circadian rhythm
  • Photic entrainment
  • Suprachiasmatic nucleus

ASJC Scopus subject areas

  • Neuroscience(all)


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