Abstract:
:In mammals, immediate-early transcription of the Period 1 (Per1) gene is crucial for resetting the mammalian circadian clock. Here, we show that CLOCK is a real signalling molecule that mediates the serum-evoked rapid induction of Per1 in fibroblasts through the Ca2+-dependent protein kinase C (PKC) pathway. Stimulation with serum rapidly induced nuclear translocation, heterodimerization and Ser/Thr phosphorylation of CLOCK just before the surge of Per1 transcription. Serum-induced CLOCK phosphorylation was abolished by treatment with PKC inhibitors but not by other kinase inhibitors. Consistently, the interaction between CLOCK and PKC was markedly increased shortly after serum shock, and the Ca2+-dependent PKC isoforms PKCalpha and PKCgamma phosphorylated CLOCK in vitro. Furthermore, phorbol myristic acetate treatment triggered immediate-early transcription of Per1 and also CLOCK phosphorylation, which were blocked by a Ca2+-dependent PKC inhibitor. These findings indicate that CLOCK activation through the Ca2+-dependent PKC pathway might have a substantial role in phase resetting of the circadian clock.
journal_name
EMBO Repjournal_title
EMBO reportsauthors
Shim HS,Kim H,Lee J,Son GH,Cho S,Oh TH,Kang SH,Seen DS,Lee KH,Kim Kdoi
10.1038/sj.embor.7400920subject
Has Abstractpub_date
2007-04-01 00:00:00pages
366-71issue
4eissn
1469-221Xissn
1469-3178pii
7400920journal_volume
8pub_type
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