Vasopressin potentiation of the melatonin synthetic pathway via specific V1a receptors in the rat pineal gland

Details

Serval ID
serval:BIB_54C7C3231E0E
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Vasopressin potentiation of the melatonin synthetic pathway via specific V1a receptors in the rat pineal gland
Journal
Regulatory Peptides
Author(s)
Simonneaux  V., Kozak  R., Arsenijevic  Y., Pevet  P.
ISSN
0167-0115 (Print)
Publication state
Published
Issued date
01/1996
Volume
61
Number
1
Pages
63-9
Notes
Journal Article --- Old month value: Jan 16
Abstract
The pineal gland releases the "time-keeping' hormone melatonin following a rhythmic sympathetic input which translates light information. The aim of this work was to study the role and mechanism of action of the central vasopressinergic input on pineal cAMP-dependent melatonin synthesis in the rat. The pineal was found to display vasopressin receptors of the V1a subtype, as the V1a antagonist [125I]HO-LVA bound in a saturable manner to pineal membranes with a high affinity (kd = 10 pM) and a maximal binding capacity (B(max)) of 13 fmol/mg protein. Vasopressin was able to displace [125I]HO-LVA binding in a dose-dependent manner (k(i) = 1.9 nM). Vasopressin had no effect on the basal cAMP level and melatonin secretion in cultured rat pinealocytes. However, it clearly and dose-dependently (EC50 = 7 nM) potentiated by 2-3 times cAMP accumulation and by 1.5-2.5 times melatonin secretion induced by moderate noradrenergic stimulation. On strongly stimulated pinealocytes, however, vasopressin could potentiate cAMP accumulation, but not melatonin secretion. The potentiatory effect of vasopressin was inhibited in the presence of the V1a antagonist. These results indicate that vasopressin is a potent modulator of rat pineal synthetic activity.
Keywords
Amino Acid Sequence Animals Cells, Cultured Cyclic AMP/metabolism Male Melatonin/*biosynthesis/secretion Molecular Sequence Data Pineal Gland/cytology/*drug effects/metabolism Rats Rats, Wistar Receptors, Vasopressin/*metabolism Vasopressins/*pharmacology
Pubmed
Web of science
Create date
28/01/2008 12:31
Last modification date
20/08/2019 14:09
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