title: Circadian rhythm photic phase shifts are not altered by histamine receptor antagonists.
abstract: Histamine may play a role in synchronizing endogenous circadian rhythms with exogenous photic cues. Direct application of histamine to the suprachiasmatic nucleus, the site of the mammalian circadian pacemaker, phase shifts the circadian rhythm in neural activity [7]. Intraventricular injections of histamine also phase shift circadian rhythms [14]. The magnitude and direction of the phase shifting effects of histamine depend on circadian phase in a manner similar to light [7,14]. Depletion of brain histamine levels by inhibition of histamine synthesis reduces phase shifts to light [10].
authors.affiliation: Department of Psychology, Smith College, Northampton, MA 01063, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: Eaton
authors.forename: S
authors.initials: S
authors.lastname: Eoh
authors.forename: J
authors.initials: J
authors.lastname: Meyer
authors.forename: S
authors.initials: S
authors.lastname: Hoque
authors.forename: M E
authors.initials: ME
authors.lastname: Harrington
mesh_terms: D000818:Animals; D052160:Benzothiazoles; D002927:Cimetidine / Q000494:pharmacology; D002940:Circadian Rhythm / Q000187:drug effects*; D006224:Cricetinae; D006633:Histamine Antagonists / Q000494:pharmacology*; D006634:Histamine H1 Antagonists / Q000494:pharmacology; D006635:Histamine H2 Antagonists / Q000494:pharmacology; D008297:Male; D008647:Mesocricetus; D050198:Phenoxypropanolamines; D017440:Photoperiod; D010880:Piperidines / Q000494:pharmacology; D011738:Pyrilamine / Q000494:pharmacology; D018100:Receptors, Histamine H3 / Q000187:drug effects; D013844:Thiazoles / Q000494:pharmacology
chemical_list: D052160:Benzothiazoles; D006633:Histamine Antagonists; D006634:Histamine H1 Antagonists; D006635:Histamine H2 Antagonists; D050198:Phenoxypropanolamines; D010880:Piperidines; D018100:Receptors, Histamine H3; D013844:Thiazoles; D002927:Cimetidine; D011738:Pyrilamine; C052075:thioperamide; C055302:zolantidine