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Phase delays to light and gastrin-releasing peptide require the protein kinase A pathway.

Neurosci. Lett.2014 Jan 24;559:24-9. Epub 2013 Nov 25
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摘要


Daily photic resetting of the circadian system relies on the transmission of light information from the retina to retinorecipient cells within the ventrolateral suprachiasmatic nucleus (SCN) core, and subsequent activation of rhythmic clock cells in the dorsolateral region. Some neurochemicals such as gastrin-releasing peptide (GRP) mimic the phase shifting effects of light and induce Ca(2+)-dependent gene expression in the SCN. Activation of the cAMP-response element binding protein (CREB) is necessary for Ca(2+)-dependent transcription to occur and accompanies behavioral phase shifting; however, several biochemical cascades are involved in this phenomenon. One pathway that has been implicated in photic responses involves protein kinase A It is not known if this pathway participates in mediating phase shifts to GRP. Here we show that preventing activation attenuates both light- and GRP-induced phase shifts in locomotor behavior, but only during the early-subjective night. This finding demonstrates that activation of duanyu1529 is an important component in the photic signaling pathway and may mediate GRP output signaling from the SCN core to the shell; however, this effect appears to be temporally dependent.

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