Abstract：
:Arginine vasopressin mediates its effects through vasopressin receptor activation and second messenger production. Recent cloning of the V1a receptor provided the opportunity to investigate the possible signal transduction pathways associated with this single vasopressin receptor subtype. When stably expressed in CHO cells, vasopressin stimulated several signal transduction pathways simultaneously including calcium influx, phospholipase A2, phospholipase C, and phospholipase D. Vasopressin-stimulated release of arachidonic acid, IP3 formation, and phosphatidylethanol formation (in the presence of 1% ethanol) were used as indexes of phospholipase A2, phospholipase C, and phospholipase D activation, respectively. V1a receptor-activation stimulated a peak followed by a sustained plateau phase of intracellular calcium. The plateau phase was dependent on extracellular calcium, insensitive to blockers of voltage sensitive calcium channels, blocked by heavy metals, and quenched when MnCl2 was present in the extracellular media. Removal of extracellular calcium blunted the release of IP3, and blocked the release of arachidonic acid and phosphatidylethanol indicating that these responses were at least in part regulated by receptor-operated calcium influx. Vasopressin-stimulated release of arachidonic acid and phosphatidylethanol were augmented with the phorbol ester PMA, and this augmentation was blocked by inhibitors of protein kinase C and absent with long-term PMA treatment. Vasopressin-stimulated IP3 release was inhibited with PMA and the inhibition reversed with protein kinase C inhibitors.
journal_name
Neuropeptidesjournal_title
Neuropeptidesauthors
Briley EM,Lolait SJ,Axelrod J,Felder CCdoi
10.1016/0143-4179(94)90017-5subject
Has Abstractpub_date
1994-07-01 00:00:00pages
63-74issue
1eissn
0143-4179issn
1532-2785pii
0143-4179(94)90017-5journal_volume
27pub_type
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