Light regulates expression of a Fos-related protein in rat suprachiasmatic nuclei
Department of Medicine, Division of Endocrinology and Metabolism; Department of Physiology; Department of Neurology
Animals; Cell Nucleus; Circadian Rhythm; DNA-Binding Proteins; Darkness; Gene Expression; Hela Cells; Humans; Immune Sera; Immunohistochemistry; *Light; Male; Proto-Oncogene Proteins; Proto-Oncogene Proteins c-fos; Rats; Rats, Inbred Strains; Suprachiasmatic Nucleus
Life Sciences | Medicine and Health Sciences
Mammalian circadian rhythmicity is endogenously generated by a pacemaker in the suprachiasmatic nuclei and precisely entrained to the 24-hr day/night cycle by periodic environmental light cues. We show that light alters the immunoreactive levels of a transcriptional regulatory protein, Fos, in the suprachiasmatic nuclei of albino rats. Photic regulation of Fos immunoreactivity does not occur in other retino-recipient brain areas except for the intergeniculate leaflet, which appears to be involved in mediating some of the complex effects of light on expressed circadian rhythms. Our results point to a promising new functional marker for the cellular effects of light and suggest that the expression of Fos or a related nuclear protein may be part of the mechanism for photic entrainment of the circadian clock to environmental light/dark cycles.
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Citation: Proc Natl Acad Sci U S A. 1990 Aug;87(15):5959-62.
Proceedings of the National Academy of Sciences of the United States of America
Aronin, Neil; Sagar, Stephen M.; Sharp, Frank R.; and Schwartz, William J., "Light regulates expression of a Fos-related protein in rat suprachiasmatic nuclei" (1990). Open Access Articles. 1829.