PLC β4-independent Ca2+ rise via muscarinic receptors in the mouse suprachiasmatic nucleus

Masayuki Ikeda*, Takashi Sugiyama, Kaoru Suzuki, Takahiro Moriya, Shigenobu Shibata, Motoya Katsuki, Charles N. Allen, Tohru Yoshioka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Cholinergic regulation of the suprachiasmatic nucleus (SCN) has been extensively studied although the intracellular signaling mechanisms are not well understood. We examined immunostaining for phospholipase C-β (PLC-β) families that couple to muscarinic acetylcholine receptors (mAChR) and demonstrated the expression of PLC-βI and β4 in the mouse SCN. Ca2+ imaging analysis indicated that the MI-mAChR antagonist, pirenzepine blocked carbachol-induced Ca2+ elevation in the SCN and the response was equivalent between the wild type and the PLC-β4-knockout mice. In addition, the knockout mice displayed locomotor and temperature rhythms coupling to 24 h light/dark cycles. Therefore, it was proposed that PLC-βI but not PLC-β4 was involved in the mAChR-mediated Ca2+ signaling in the SCN. (C) 2000 Lippincott Williams and Wilkins.

Original languageEnglish
Pages (from-to)907-912
Number of pages6
Issue number5
Publication statusPublished - 2000 Apr 7


  • Body temperature
  • Calcium imaging
  • Carbachol
  • Circadian rhythm
  • Immunostaining
  • Locomotor activity
  • Muscarinic acetylcholine receptor
  • Phospholipase C-β
  • Pirenzepine
  • Suprachiasmatic nucleus

ASJC Scopus subject areas

  • General Neuroscience


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