| Increased late night response to light controls the circadian pacemaker in a nocturnal primate. | |
| | |
MedLine Citation:
|
PMID: 20484690 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The mammalian endogenous circadian clock, the suprachiasmatic nuclei, receives environmental inputs, namely the light-dark cycle, through photopigments located in the eye and from melanopsin-expressing retinal ganglion cells. The authors investigated the influence of light wavelength and intensity on the synchronization of the rest-activity rhythm of the gray mouse lemur, a nocturnal Malagasy primate. Animals were tested at different irradiance levels (320, 45, 13, and 6 nmol x m(-2) x s(- 1)) under several light wavelengths (from 400 to 610 nm). Several parameters including circadian period, activity, and body temperature waveforms were used to assess synchronization to a 12:12 light-dark cycle in comparison to control treatments (12:12 white light or continuous darkness). Entrainment of the circadian rest-activity cycle increased with light intensity. It was more efficient for mid wavelengths relative to shorter or longer wavelengths but not coincident with melanopsin maximal sensitivity, suggesting other photoreceptors are likely involved in lemurs' photoentrainment. The authors obtained a novel synchronization pattern characterized by a clear synchronization to lights-on only without phasing to lights-off. Changes in photo-responsiveness at dusk and dawn highlight differential responses of evening and morning oscillators in the circadian clock. |
| | |
Authors:
|
Martine Perret; Doris Gomez; Alexandra Barbosa; Fabienne Aujard; Marc Théry |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Journal of biological rhythms Volume: 25 ISSN: 1552-4531 ISO Abbreviation: J. Biol. Rhythms Publication Date: 2010 Jun |
Date Detail:
|
Created Date: 2010-05-20 Completed Date: 2010-08-12 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8700115 Medline TA: J Biol Rhythms Country: United States |
Other Details:
|
Languages: eng Pagination: 186-96 Citation Subset: IM |
Affiliation:
|
UMR 7179 Centre National de la Recherche Scientifique, Muséum National d'Histoire Naturelle, Département d'Ecologie et Gestion de la Biodiversité, Brunoy, France. martine.perret@wanadoo.fr |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Activity Cycles
/
physiology,
radiation effects Animals Body Temperature Cheirogaleidae Circadian Rhythm / physiology*, radiation effects* Female Light* Male Motor Activity / physiology, radiation effects Photic Stimulation Photoperiod* Photoreceptor Cells, Vertebrate / physiology Rod Opsins |
| Chemical | |
Reg. No./Substance:
|
0/Rod Opsins; 0/melanopsin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Photoperiod and reproductive condition are associated with changes in RFamide-related peptide (RFRP)...
Next Document: Two components of nocturnal locomotor suppression by light.