A functional subdivision of the circadian clock is revealed by differential effects of melatonin administration.

Abstract:

:The biological clock of the suprachiasmatic nuclei drives numerous physiological and behavioural circadian rhythms. In this study, we addressed the question as to whether different components of the clock may control separately various circadian functions. Using the rat transpineal microdialysis tool, we analysed the effect of clock perturbation by exogenous melatonin injection on two hormonal clock outputs: pineal melatonin and adrenal corticosterone secretions. As already reported, a single melatonin injection at the light/dark transition induces a marked increase in the endogenous pineal melatonin peak for the two following days. In the same animals, by contrast, the amplitude of the corticosterone rhythm was not altered following melatonin injection. These data show that the melatonin injection does not display an overall effect on the circadian clock, but rather influences a subpopulation of melatonin-sensitive neurons involved, among other functions, in the circadian control of the pineal pathway.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Tritschler L,Saboureau M,Pévet P,Bothorel B

doi

10.1016/j.neulet.2005.11.007

keywords:

subject

Has Abstract

pub_date

2006-03-20 00:00:00

pages

73-6

issue

1

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(05)01287-5

journal_volume

396

pub_type

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