Regulation of Vasoactive Intestinal Polypeptide Release in the Suprachiasmatic Nucleus Circadian Clock

Overview

Journal Neuroreport

Specialty Neurology

Date 2010 Sep 15

PMID 20838260

Citations 20

Authors

Jessica M Francl

Gagandeep Kaur

John David Glass

Affiliations

Soon will be listed here.

Abstract

Timing of the mammalian circadian clock of the suprachiasmatic nucleus (SCN) is regulated by photic input from the retina. Retinorecipient units entrain rhythmicity of SCN pacemaker cells in part through their release of vasoactive intestinal polypeptide (VIP). The underlying nature of this process is conjectural, however, as in-vivo SCN VIP release has never been measured. Here, SCN microdialysis was used to investigate mechanisms regulating VIP. Hamsters under light-dark cycle of 14:10 exhibited a daily peak in synaptic VIP release near midday. Under constant darkness, this output was arrhythmic. Light and the glutamatergic agonist, N-methyl-D-aspartate, stimulated VIP release at night, whereas the serotonin (1A,7) agonist, (±)8-hydroxy-2-(di-n-propylamino)tetralin hydrobromide, suppressed release at midday. Hence, SCN VIP activity is stimulated by photic input and inhibited by serotonin.

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