• Brain research · Aug 1996

    Constant light induces persistent Fos expression in rat intergeniculate leaflet.

    • K Edelstein and S Amir.
    • Department of Psychology, Concordia University, Montreal, Canada.
    • Brain Res. 1996 Aug 26;731(1-2):221-5.

    AbstractFos protein expression in retinorecipient suprachiasmatic nucleus (SCN) neurons is a marker of photic entrainment of circadian rhythms. Light-induced Fos in neurons of the intergeniculate leaflet (IGL) is not well-characterized. We compared Fos immunoreactivity (Fos-IR) in SCN and IGL neurons of rats housed under various lighting conditions and sacrificed at different phases of the circadian period. IGL neurons of rats that received 1 h-3 weeks of light exposure prior to sacrifice displayed Fos-IR, whereas the IGL of animals exposed only to darkness displayed little if any staining. In contrast with light-induced Fos in SCN neurons, Fos-IR was observed in the IGL regardless of circadian time. This work supports the idea that the IGL is involved in transmission of photic information to the SCN in rats.

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