title: Circadian rhythm and neural regulation of rat pineal angiotensin converting enzyme.
abstract: Angiotensin converting enzyme was detectable in rat pineal gland and exhibited a circadian rhythm in activity with maximum at the end of the light phase of daily photoperiod. Superior cervical ganglionectomy (SCGx) or exposure to light for 6 days increased enzyme activity and obliterated morning-evening differences, whereas injection of the beta-agonist isoproterenol depressed the high values observed in SCGx animals. These results indicate that angiotensin converting enzyme in the pineal gland is under negative control by the norepinephrine released from pineal sympathetic nerves.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm / Q000187:drug effects; D005728:Ganglia, Sympathetic / Q000502:physiology*; D007545:Isoproterenol / Q000494:pharmacology; D008027:Light; D008297:Male; D009638:Norepinephrine / Q000502:physiology; D007703:Peptidyl-Dipeptidase A / Q000378:metabolism*; D010870:Pineal Gland / Q000201:enzymology*; D051381:Rats; D011919:Rats, Inbred Strains; D011943:Receptors, Adrenergic, beta / Q000502:physiology; D013116:Spinal Cord / Q000502:physiology
chemical_list: D011943:Receptors, Adrenergic, beta; D007703:Peptidyl-Dipeptidase A; D007545:Isoproterenol; D009638:Norepinephrine