Shift of circadian rhythm of serotonin:acetyl coenzyme A N-acetyltransferase activity in pineal gland of rat in continuous darkness or in the blinded rat

1975 ◽  
Vol 25 (1) ◽  
pp. 91-93 ◽  
Author(s):  
T. Deguchi
Keyword(s):  
Circadian Rhythm ◽  
Pineal Gland ◽  
Coenzyme A ◽  
Continuous Darkness ◽  
Acetyltransferase Activity

Thymidine incorporation by cultured chick pineal glands is not subject to adrenergic regulation

1990 ◽  
Vol 68 (1) ◽  
pp. 145-147 ◽  
Author(s):  
S. D. Wainwright ◽  
Lillian K. Wainwright
Keyword(s):  
Circadian Rhythm ◽  
Circadian Rhythms ◽  
Pineal Gland ◽  
Thymidine Incorporation ◽  
Adrenergic Regulation ◽  
Acetyltransferase Activity

Norepinephrine is known to play a role in regulating the circadian rhythms of serotonin N-acetyltransferase activity and melatonin formation in the chick pineal gland. We have recently demonstrated that the cultured chick pineal exhibits a circadian rhythm in the incorporation of thymidine. In this study we show that this latter rhythm is not subject to adrenergic control.Key words: chick, pineal gland, thymidine incorporation, adrenergic regulation.

Circadian rhythms of enzyme and running activity under ultradian lighting schedule.

1977 ◽  
Vol 232 (4) ◽  
pp. E375
Author(s):  
T Deguchi
Keyword(s):  
Circadian Rhythm ◽  
Circadian Rhythms ◽  
Pineal Gland ◽  
Dark Period ◽  
Foster Mother ◽  
Lighting Condition ◽  
Acetyltransferase Activity ◽  
Lighting Conditions ◽  
Running Activity ◽  
Circadian Change

Serotonin N-acetyltransferase activity in the pineal gland and running acitvity of rats were measured under an ultradian lighting schedule (light/dark 6:6). When rats were moved from a diurnal lighting condition to the ultradian conditions, N-acetyltransferase activity showed a circadian rhythm, increasing once a day. N-acetyltransferase activity in the pups born and raised under the ultradian lighting conditions also exhibited a circadian change, the phase of which coincided with that of their mothers. When pups were raised by a foster mother with an inverted rhythmic phase from that of the original mother, the phase of the rhythm in N-acetyltransferase activity of the pups synchronized with that of the foster mother. When pups were separated from their mothers for 12 h/day, the circadian increase of N-acetyltransferase activity appeared during the dark period when they were separated from their mothers. The circadian rhythms of running acitvity were in phase with those of N-acetyltransferase activity in the pineal gland.

Retinal illumination phase shifts the circadian rhythm of serotonin N-acetyltransferase activity in the chicken pineal gland

2004 ◽  
Vol 360 (3) ◽  
pp. 153-156 ◽  
Author(s):  
Jolanta B. Zawilska ◽  
Małgorzata Berezińska ◽  
Anna Lorenc ◽  
Debra J. Skene ◽  
Jerzy Z. Nowak
Keyword(s):  
Circadian Rhythm ◽  
Pineal Gland ◽  
Phase Shifts ◽  
Acetyltransferase Activity
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