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Genes Dev. 2000 Mar 15;14(6):645-9.

Involvement of the MAP kinase cascade in resetting of the mammalian circadian clock.

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  • 1Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.


Although the suprachiasmatic nucleus (SCN) is the major pacemaker in mammals, the peripheral cells or immortalized cells also contain a circadian clock. The SCN and the periphery may use different entraining signals-light and some humoral factors, respectively. We show that induction of the circadian oscillation of gene expression is triggered by TPA treatment of NIH-3T3 fibroblasts, which is inhibited by a MEK inhibitor, and that prolonged activation of the MAPK cascade is sufficient to trigger circadian gene expression. Therefore, such prolonged activation of MAPK by entraining cues may be involved in the resetting of the circadian clock.

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