Melatonin secretion from goldfish pineal gland in organ culture
Identifieur interne : 001791 ( Main/Exploration ); précédent : 001790; suivant : 001792Melatonin secretion from goldfish pineal gland in organ culture
Auteurs : Hiroaki Kezuka [Japon] ; Katsumi Aida [Japon] ; Isao Hanyu [Japon]Source :
- General and Comparative Endocrinology [ 0016-6480 ] ; 1988.
Abstract
Pineal glands were removed from goldfish reared under 12L-12D at 25° for 2 weeks. These were incubated for 6 days under (1) normal 12L-12D (lights on 0600–1800 hr), (2) reversed 12L-12D (lights on 1800–0600 hr), (3) continuous dark, or (4) continuous light condition at 25°. The incubation medium was changed at 12-hr intervals (0600–1800 and 1800–0600 hr) and secreted melatonin (MLT) was measured by RIA. Under 12L-12D or reversed 12L-12D, MLT secretion was active in the dark phase and was suppressed in the light phase of a given photoperiod. Under a continuous dark condition, a large amount of MLT was secreted into the medium, although the amount gradually decreased. The MLT secretion was more active in the period corresponding to the dark phase of the acclimatory photoperiod than in the period corresponding to the light phase. This pattern in secretion remained for 4 days. Under a continuous light condition, MLT secretion was suppressed, but the secretion was rapidly increased after changing the photoperiod from the light to the dark condition. These findings clearly indicate that MLT secretion in the organ-cultured pineal gland is photosensitive. It is active under dark and inactive under light conditions. The existence of a circadian rhythm in MLT secretion is also suggested.
Url:
DOI: 10.1016/0016-6480(89)90073-7
Affiliations:
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These were incubated for 6 days under (1) normal 12L-12D (lights on 0600–1800 hr), (2) reversed 12L-12D (lights on 1800–0600 hr), (3) continuous dark, or (4) continuous light condition at 25°. The incubation medium was changed at 12-hr intervals (0600–1800 and 1800–0600 hr) and secreted melatonin (MLT) was measured by RIA. Under 12L-12D or reversed 12L-12D, MLT secretion was active in the dark phase and was suppressed in the light phase of a given photoperiod. Under a continuous dark condition, a large amount of MLT was secreted into the medium, although the amount gradually decreased. The MLT secretion was more active in the period corresponding to the dark phase of the acclimatory photoperiod than in the period corresponding to the light phase. This pattern in secretion remained for 4 days. Under a continuous light condition, MLT secretion was suppressed, but the secretion was rapidly increased after changing the photoperiod from the light to the dark condition. These findings clearly indicate that MLT secretion in the organ-cultured pineal gland is photosensitive. It is active under dark and inactive under light conditions. The existence of a circadian rhythm in MLT secretion is also suggested.</div></front></TEI><affiliations><list><country><li>Japon</li></country><region><li>Région de Kantō</li></region><settlement><li>Tokyo</li></settlement><orgName><li>Université de Tokyo</li></orgName></list><tree><country name="Japon"><region name="Région de Kantō"><name sortKey="Kezuka, Hiroaki" sort="Kezuka, Hiroaki" uniqKey="Kezuka H" first="Hiroaki" last="Kezuka">Hiroaki Kezuka</name></region><name sortKey="Aida, Katsumi" sort="Aida, Katsumi" uniqKey="Aida K" first="Katsumi" last="Aida">Katsumi Aida</name><name sortKey="Hanyu, Isao" sort="Hanyu, Isao" uniqKey="Hanyu I" first="Isao" last="Hanyu">Isao Hanyu</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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