Circadian rhythms of hypothalamic norepinephrine and of some circulating substances in individually housed adult rats.
The circadian rhythms of hypothalamic norepinephrine (NE) and of circulating norepinephrine, epinephrine (E), corticosterone, aldosterone, and serotonin (5HT) were determined in group-housed and in individually housed male adult rats, adapted to a 12/12 light/dark cycle. After 5 weeks of individual housing, compared to group-housed animals, hypothalamic NE mesor decreased, while circulating NE, E, and corticosterone mesor increased. The circadian rhythms of aldosterone and 5HT were unaffected by individual housing.
Greco
A M
AM
Istituto di Scienze Fisiologiche Umane, II Facolta' di Medicina e Chirurgia, Universita degli Studi di Napoli Federico II, Italy.
Gambardella
P
P
Sticchi
R
R
D'Aponte
D
D
de Franciscis
P
P
D000324:Adrenocorticotropic Hormone / Q000502:physiology; D000450:Aldosterone / Q000502:physiology*; D000818:Animals; D001143:Arousal / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D003345:Corticosterone / Q000502:physiology*; D004837:Epinephrine / Q000502:physiology*; D005247:Feeding Behavior / Q000502:physiology*; D007031:Hypothalamus / Q000502:physiology*; D008297:Male; D009638:Norepinephrine / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D012701:Serotonin / Q000502:physiology*; D012931:Social Environment; D012934:Social Isolation
D012701:Serotonin; D000450:Aldosterone; D000324:Adrenocorticotropic Hormone; D003345:Corticosterone; D009638:Norepinephrine; D004837:Epinephrine