Linked Life Data

7525073

Source:http://linkedlifedata.com/resource/pubmed/id/7525073

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1994-11-29
pubmed:abstractText
Trout pineal cells maintained in primary culture produce melatonin in high amounts during night time and low amounts during daytime. The dark-induced increase in melatonin production was enhanced, in a dose-dependent manner, by elevating extracellular calcium concentration. Low external calcium concentration reduced nocturnal and diurnal melatonin production. Bay K 8644 increased, in a dose-dependent manner, the dark-induced rise in melatonin output, and this effect was antagonized by nifedipine and verapamil. This suggests a role for the dihydropyridine calcium channels in the regulation of the melatonin output. To confirm this, patch-clamp recordings (whole-cell perforated) were run in a 20 mmol/l barium medium at different holding potentials from -80 mV. A voltage-dependent inward current was activated from -30 mV to +40 mV with a maximal amplitude being observed at 0 mV. This current was drastically increased in the presence of Bay K 8644. Nifedipine inhibited the current both in the absence or in the presence of Bay K 8644. Our results are consistent with the idea that extracellular calcium participates in the control of melatonin secretion by photoreceptor cells. It is suggested that activation of the voltage-dependent L-type channel may modulate this secretion.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0143-4160
pubmed:author
pubmed:issnType
Print
pubmed:volume
16
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
37-46
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Calcium and melatonin production in dissociated trout pineal photoreceptor cells in culture.
pubmed:affiliation
Laboratoire de Neurobiologie et de Neuroendocrinologie Cellulaires, URA CNRS 1869, Poitiers, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't