title: Signaling mediated by the dopamine D2 receptor potentiates circadian regulation by CLOCK:BMAL1.
abstract: Environmental cues modulate a variety of intracellular pathways whose signaling is integrated by the molecular mechanism that constitutes the circadian clock. Although the essential gears of the circadian machinery have been elucidated, very little is known about the signaling systems regulating it. Here, we report that signaling mediated by the dopamine D2 receptor (D2R) enhances the transcriptional capacity of the CLOCK:BMAL1 complex. This effect involves the mitogen-activated protein kinase transduction cascade and is associated with a D2R-induced increase in the recruiting and phosphorylation of the transcriptional coactivator cAMP-responsive element-binding protein (CREB) binding protein. Importantly, CLOCK:BMAL1-dependent activation and light-inducibility of mPer1 gene transcription is drastically dampened in retinas of D2R-null mice. Because dopamine is the major catecholamine in the retina, central for the neural adaptation to light, our findings establish a physiological link among photic input, dopamine signaling, and the molecular clock machinery.
authors.affiliation: Institut de Génétique et de Biologie Moléculaire et Cellulaire, 1 Rue Laurent Fries, 67404 Illkirch-Strasbourg, France.
authors.forename: Irene
authors.initials: I
authors.lastname: Yujnovsky
authors.forename: Jun
authors.initials: J
authors.lastname: Hirayama
authors.forename: Masao
authors.initials: M
authors.lastname: Doi
authors.forename: Emiliana
authors.initials: E
authors.lastname: Borrelli
authors.forename: Paolo
authors.initials: P
authors.lastname: Sassone-Corsi
mesh_terms: D056930:ARNTL Transcription Factors; D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000378:metabolism*; D056926:CLOCK Proteins; D050882:CREB-Binding Protein / Q000378:metabolism; D018797:Cell Cycle Proteins; D002940:Circadian Rhythm / Q000235:genetics*; D056931:Cryptochromes; D004298:Dopamine / Q000502:physiology*; D015536:Down-Regulation; D005420:Flavoproteins / Q000378:metabolism; D005786:Gene Expression Regulation; D008027:Light; D051379:Mice; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism; D009687:Nuclear Proteins / Q000235:genetics; D056950:Period Circadian Proteins; D010766:Phosphorylation; D011401:Promoter Regions, Genetic; D017448:Receptors, Dopamine D2 / Q000819:agonists / Q000235:genetics / Q000502:physiology*; D012160:Retina / Q000378:metabolism; D015398:Signal Transduction; D015534:Trans-Activators / Q000378:metabolism*; D014158:Transcription, Genetic; D015533:Transcriptional Activation
chemical_list: D056930:ARNTL Transcription Factors; D051792:Basic Helix-Loop-Helix Proteins; D056926:CLOCK Proteins; D050882:CREB-Binding Protein; D018797:Cell Cycle Proteins; D056931:Cryptochromes; D004298:Dopamine; D005420:Flavoproteins; D020929:Mitogen-Activated Protein Kinase Kinases; D009687:Nuclear Proteins; D056950:Period Circadian Proteins; D017448:Receptors, Dopamine D2; D015534:Trans-Activators; C538961:Bmal1 protein, mouse; C539023:Per1 protein, mouse; C538944:Clock protein, mouse; C494364:Crebbp protein, mouse