Linked Life Data

11082542

Source:http://linkedlifedata.com/resource/pubmed/id/11082542

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2001-1-26
pubmed:abstractText
To identify the characteristics of the oscillator located in the pineal organ, we examined the effects of temperature and light on melatonin secretion rhythm using pineal organs in cultures. At 20 degrees C, the melatonin rhythm was obvious: low secretion during the daytime and high during the nighttime. When the temperature was lowered from 20 to 10 degrees C, the melatonin rhythm disappeared. When the temperature was returned from 10 to 20 degrees C, the rhythm quickly reappeared. The plasma melatonin level was measured in living lampreys kept at 7 degrees C to establish the melatonin profile at low temperature in vivo: secretion was not significantly different between daytime and nighttime. Under continuous light conditions, the melatonin elevation normally seen during the subjective night became obscure after 72 h. When the LD cycle was shifted by 6 h (phase-advanced or phase-delayed), the melatonin rhythm shifted to remain in the same phase relation to the LD cycle. This re-synchronization took several LD cycles. The results indicate that, in cultures, the melatonin secretion rhythm in the pineal organ of the lamprey is both light- and temperature-sensitive, and that in vivo, the melatonin rhythm is not the critical factor maintaining the locomotor activity rhythm of the lamprey. The role of the pineal organ and melatonin in the circadian organization of the lamprey is discussed.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0021-521X
pubmed:author
pubmed:issnType
Print
pubmed:volume
50
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
437-42
pubmed:dateRevised
2007-3-21
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Light- and temperature-dependence of the melatonin secretion rhythm in the pineal organ of the lamprey, Lampetra japonica.
pubmed:affiliation
Department of Physiology, Hamamatsu University School of Medicine, Hamamatsu, 431-3192 Japan. samejima@hama-med.ac.jp
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't