title: Forskolin induces circadian gene expression of rPer1, rPer2 and dbp in mammalian rat-1 fibroblasts.
abstract: Mammalian culture cells have the potential for periodicity, since high concentrations of serum can elicit the circadian expression of clock genes in rat-1 fibroblasts. However, the mechanism by which serum affects circadian gene expression remains unclear. In the present study, we incubated rat-1 cells with forskolin and successfully induced the rhythmic expression of Per1, Per2 and dbp. In the initial step of the circadian gene expression, a marked transient induction of Per1 was observed accompanied with CREB phosphorylation. Thus the present study strongly suggests that CREB activation through the cAMP/PKA pathway is involved in the generation of circadian rhythm in rat-1 cells
authors.affiliation: Department of Anatomy and Brain Science, Kobe University School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yagita
authors.forename: H
authors.initials: H
authors.lastname: Okamura
mesh_terms: D051698:Activating Transcription Factor 2; D000818:Animals; D002352:Carrier Proteins / Q000096:biosynthesis / Q000235:genetics*; D018797:Cell Cycle Proteins; D002478:Cells, Cultured; D002940:Circadian Rhythm / Q000235:genetics; D005576:Colforsin / Q000494:pharmacology*; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism; D029382:Dicarboxylic Acid Transporters; D015870:Gene Expression; D009687:Nuclear Proteins / Q000096:biosynthesis / Q000235:genetics*; D056950:Period Circadian Proteins; D010766:Phosphorylation; D051381:Rats; D014157:Transcription Factors / Q000378:metabolism
chemical_list: D051698:Activating Transcription Factor 2; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D017362:Cyclic AMP Response Element-Binding Protein; D029382:Dicarboxylic Acid Transporters; D009687:Nuclear Proteins; C539023:Per1 protein, mouse; C539024:Per1 protein, rat; C513312:Per2 protein, mouse; C513311:Per2 protein, rat; D056950:Period Circadian Proteins; D014157:Transcription Factors; D005576:Colforsin