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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Commun+Integr+Biol
2015 ; 8
(4
): e982405
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Cell-based inhibitor screening identifies multiple protein kinases important for
circadian clock oscillations
#MMPMID26478783
Kon N
; Sugiyama Y
; Yoshitane H
; Kameshita I
; Fukada Y
Commun Integr Biol
2015[Jul]; 8
(4
): e982405
PMID26478783
show ga
Molecular oscillation of the circadian clock is based on E-box-mediated
transcriptional feedback loop formed with clock genes and their encoding
products, clock proteins. The clock proteins are regulated by post-translational
modifications such as phosphorylation. We investigated the effects of a series of
kinase inhibitors on gene expression rhythms in Rat-1 fibroblasts. The period of
the cellular circadian rhythm in culture was lengthened by treatment with
SB203580 (p38 MAPK inhibitor), SP600125 (JNK inhibitor), IC261 (CKI inhibitor)
and Roscovitine (CDK inhibitor). On the other hand, the period was shortened by
SB216763 (GSK-3 inhibitor) or KN93 (CaMKII inhibitor) treatment. Application of
20 ?M KN93 completely abolished the rhythmic gene expression. The activity of
CaMKII exhibited circadian variation in a phase close to the E-box-mediated
transcriptional rhythms. In vitro kinase assay revealed that CaMKII directly
phosphorylates N-terminal and Ser/Pro-rich domains of CLOCK, an activator of
E-box-mediated transcription. These results indicate a phosphorylation-dependent
tuning of the period length by a regulatory network of multiple kinases and
reveal an essential role of CaMKII in the cellular oscillation mechanism.