title: Effect of short-term constant light or constant darkness on the nyctohemeral rhythm of type-II iodothyronine 5'-deiodinase activity in rat anterior pituitary and pineal.
abstract: Type-II iodothyronine 5'-deiodinase activity (5'-D) in both anterior pituitary and pineal was significantly elevated at 2400 h, approximately 0.5- and 20-fold higher than the noon value, respectively. The nocturnal rise in both organs was abolished by 6 h additional light. Short-term constant darkness did not alter 5'-D rhythmicity in either organ. These data suggest that environmental lighting plays an important role in the control of the 5'-D nyctohemeral rhythm in both anterior pituitary and pineal.
authors: Department of Medicine, Oregon Health Sciences University, Portland 97201.
authors: M
authors: M
authors: Murakami
authors: M A
authors: MA
authors: Greer
authors: S E
authors: SE
authors: Greer
authors: S
authors: S
authors: Hjulstad
authors: K
authors: K
authors: Tanaka
mesh_terms: D000818:Animals; D002940:Circadian Rhythm / Q000528:radiation effects*; D003624:Darkness; D007453:Iodide Peroxidase / Q000378:metabolism*; D008027:Light; D008297:Male; D010870:Pineal Gland / Q000201:enzymology*; D010903:Pituitary Gland, Anterior / Q000201:enzymology*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D007453:Iodide Peroxidase