scholarly journals Light- and Temperature-Dependence of the Melatonin Secretion Rhythm in the Pineal Organ of the Lamprey, Lampetra japonica.

2000 ◽  
Vol 50 (4) ◽  
pp. 437-442 ◽  
Author(s):  
Michikazu Samejima ◽  
Shaik Shavali ◽  
Satoshi Tamotsu ◽  
Katsuhisa Uchida ◽  
Yukitomo Morita ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Pineal Organ ◽  
Melatonin Secretion ◽  
Lampetra Japonica

Regulation of melatonin secretion in the pineal organ of the domestic duck – an in vitro study

2015 ◽  
Vol 18 (3) ◽  
pp. 635-644 ◽  
Author(s):  
M. Prusik ◽  
B. Lewczuk ◽  
N. Ziółkowska ◽  
B. Przybylska-Gornowicz
Keyword(s):  
Pineal Organ ◽  
Continuous Light ◽  
In Vitro Study ◽  
Secretory Activity ◽  
High Amplitude ◽  
Diurnal Changes ◽  
Light Cycle ◽  
Melatonin Secretion ◽  
Dark Cycle

AbstractThe aim of study was to determine the mechanisms regulating melatonin secretion in the pineal organs of 1-day-old and 9-month-old domestic ducks. The pineals were cultured in a superfusion system under different light conditions. Additionally, some explants were treated with norepinephrine.The pineal glands of 1-day-old ducks released melatonin in a well-entrained, regular rhythm during incubation under a 12 hrs light : 12 hrs dark cycle and adjusted their secretory activity to a reversed 12 hrs dark : 12 hrs light cycle within 2 days. In contrast, the diurnal changes in melatonin secretion from the pineals of 9-month-old ducks were largely irregular and the adaptation to a reversed cycle lasted 3 days. The pineal organs of nestling and adult ducks incubated in a continuous light or darkness secreted melatonin in a circadian rhythm. The treatment with norepinephrine during photophases of a light-dark cycle resulted in: 1) a precise adjustment of melatonin secretion rhythm to the presence of this catecholamine in the culture medium, 2) a very high amplitude of the rhythm, 3) a rapid adaptation of the pineal secretory activity to a reversed light-dark cycle. The effects of norepinephrine were similar in the pineal organs of nestlings and adults.In conclusion, melatonin secretion in the duck pineal organ is controlled by three main mechanisms: the direct photoreception, the endogenous generator and the noradrenergic transmission. The efficiency of intra-pineal, photosensitivity-based regulatory mechanism is markedly lower in adult than in nestling individuals.

scholarly journals Roles of Direct Photoreception and the Internal Circadian Oscillator in the Regulation of Melatonin Secretion in the Pineal Organ of the Domestic Turkey: A Novel In Vitro Clock and Calendar Model

2019 ◽  
Vol 20 (16) ◽  
pp. 4022 ◽  
Author(s):  
Magdalena Prusik ◽  
Bogdan Lewczuk
Keyword(s):  
Pineal Organ ◽  
High Amplitude ◽  
Attractive Alternative ◽  
Melatonin Secretion ◽  
Continuous Darkness ◽  
Light Pulses ◽  
Acting Mechanism ◽  
Internal Oscillator ◽  
D 12

The regulation of melatonin secretion in the avian pineal organ is highly complex and shows prominent interspecies differences. The aim of this study was to determine the roles of direct photoreception and the internal oscillator in the regulation of melatonin secretion in the pineal organ of the domestic turkey. The pineal organs were collected from 12-, 13- and 14-week-old female turkeys reared under a 12 L:12 D cycle with the photophase from 07.00 to 19.00, and were incubated in superfusion culture for 3–6 days. The cultures were subjected to different light conditions including 12 L:12 D cycles with photophases between 07.00 and 19.00, 13.00 and 01.00 or 01.00 and 13.00, a reversed cycle 12 D:12 L, cycles with long (16 L:8 D) and short (8 L:16 D) photophases, and continuous darkness or illumination. The pineal organs were also exposed to light pulses of variable duration during incubation in darkness or to periods of darkness during the photophase. The secretion of melatonin was determined by direct radioimmunoassay. The turkey pineal organs secreted melatonin in a well-entrained diurnal rhythm with a very high amplitude. Direct photoreception as an independently acting mechanism was able to ensure quick and precise adaptation of the melatonin secretion rhythm to changes in light-dark conditions. The pineal organs secreted melatonin in circadian rhythms during incubation in continuous darkness or illumination. The endogenous oscillator of turkey pinealocytes was able to acquire and store information about the light-dark cycle and then to generate the circadian rhythm of melatonin secretion in continuous darkness according to the stored data. The obtained data suggest that the turkey pineal gland is highly autonomous in the generation and regulation of the melatonin secretion rhythm. They also demonstrate that the turkey pineal organ in superfusion culture is a valuable model for chronobiological studies, providing a highly precise clock and calendar. This system has several features which make it an attractive alternative to other avian pineal glands for circadian studies.

Regulation by Light and Darkness of Melatonin Secretion from the Superfused Masu Salmon (Oncorhynchus masou) Pineal Organ

1998 ◽  
Vol 29 (1) ◽  
pp. 86-97 ◽  
Author(s):  
Masayuki M. Iigo ◽  
Shoji S. Kitamurai ◽  
Kazumasa K. Ikuta ◽  
F. Javier F.J. Sánchez-Vázquezi ◽  
Ritsuko R. Ohtani-Kanekoi ◽  
...  
Keyword(s):  
Pineal Organ ◽  
Masu Salmon ◽  
Oncorhynchus Masou ◽  
Melatonin Secretion ◽  
Masu Salmon Oncorhynchus Masou

scholarly journals Regulation of melatonin secretion in a photoreceptive pineal organ: an in vitro study in the pike

1989 ◽  
Vol 9 (6) ◽  
pp. 1943-1950 ◽  
Author(s):  
J Falcon ◽  
JB Marmillon ◽  
B Claustrat ◽  
JP Collin
Keyword(s):  
Pineal Organ ◽  
In Vitro Study ◽  
Vitro Study ◽  
Melatonin Secretion

Dissociation of photoreceptor cells from the pineal organ of the lamprey, Lampetra japonica

1991 ◽  
Vol 263 (3) ◽  
pp. 589-592 ◽  
Author(s):  
M. Samejima ◽  
S. Tamotsu ◽  
Y. Muranaka ◽  
Y. Morita
Keyword(s):  
Pineal Organ ◽  
Photoreceptor Cells ◽  
Lampetra Japonica
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