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- W2041014501 abstract "Abstract The main mammalian circadian clock, localized in the suprachiasmatic nuclei can be synchronized not only with light, but also with serotonergic activation. Serotonergic agonists and serotonin reuptake inhibitors (e.g., fluoxetine) have a non‐photic influence (shifting effects during daytime and attenuation of photic resetting during nighttime) on hamsters’ and mice’ main clock. Surprisingly, in rats serotonergic modulation of the clock shows essentially photic‐like features in vivo (shifting effects during nighttime). To delineate this apparent paradox, we analyzed the effects of fluoxetine and serotonin agonists on rats’ clock. First, fluoxetine induced behavioral phase‐advances associated with down‐regulated expression of the clock genes Per1 and Rorβ and up‐regulated expression of Rev‐erbα during daytime. Moreover, fluoxetine produced an attenuation of light‐induced phase‐advances in association with altered expression of Per1 , Per2 and Rorβ during nighttime. Second, we showed that 5‐HT 1A receptors ‐maybe with co‐activation of 5‐HT 7 receptors‐ were implicated in non‐photic effects on the main clock. By contrast, 5‐HT 3 and 5‐HT 2C receptors were involved in photic‐like effects and, for 5‐HT 2C subtype only, in potentiation of photic resetting. Thus this study demonstrates that as for other nocturnal rodents, a global activation of the serotonergic system induces non‐photic effects in the rats’ clock during daytime and nighttime." @default.
- W2041014501 created "2016-06-24" @default.
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- W2041014501 creator A5059387028 @default.
- W2041014501 date "2009-06-15" @default.
- W2041014501 modified "2023-10-16" @default.
- W2041014501 title "New light on the serotonergic paradox in the rat circadian system" @default.
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- W2041014501 doi "https://doi.org/10.1111/j.1471-4159.2009.06128.x" @default.
- W2041014501 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19457131" @default.
- W2041014501 hasPublicationYear "2009" @default.
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