Document Detail

Photoreceptors regulating circadian behavior: a mouse model.
MedLine Citation:
PMID:  8274758     Owner:  NLM     Status:  MEDLINE    
Our recent studies have examined circadian photoreception in mice with hereditary retinal disorders (rd/rd and rds/rds). Despite the loss of visual function in these mice, circadian responses to light remain unaffected. Using c-fos expression within the suprachiasmatic nuclei (SCN) as a marker of neural activation of the circadian entrainment pathway, we have found identical levels of Fos in the SCN of rd/rd and +/+ mice in response to retinal illumination. On the basis of action spectrum studies, and measurements of photopigment retinoids using high-pressure liquid chromatography, we believe that the photopigment mediating circadian responses to light is based upon an opsin, and that 11-cis-retinaldehyde is the photopigment chromophore. Preliminary measurements of mouse rod opsin, blue cone, and green-red cone opsin messenger RNA in retinally degenerate mice suggest that none of these opsins is exclusively used to mediate circadian responses to light. Collectively, our data suggest that circadian photoreception can be maintained by a very small number of rod or cone cells without outer segments, or, alternatively, is performed by an unrecognized class of photoreceptive cell within the mammalian retina.
R G Foster; S Argamaso; S Coleman; C S Colwell; A Lederman; I Provencio
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.; Review    
Journal Detail:
Title:  Journal of biological rhythms     Volume:  8 Suppl     ISSN:  0748-7304     ISO Abbreviation:  J. Biol. Rhythms     Publication Date:  1993  
Date Detail:
Created Date:  1994-02-10     Completed Date:  1994-02-10     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8700115     Medline TA:  J Biol Rhythms     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  S17-23     Citation Subset:  IM    
Department of Biology, University of Virginia, Charlottesville 22901.
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MeSH Terms
Behavior, Animal / physiology*
Circadian Rhythm / physiology*
Mice, Neurologic Mutants
Models, Neurological
Photoreceptor Cells / physiology*
Retinal Degeneration / genetics,  physiopathology
Grant Support

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