PHOSPHOLIPASES AND MELATONIN SIGNAL-TRANSDUCTION IN THE OVINE PARS TUBERALIS

被引：29

作者：

MCNULTY, S ^{[1
]}

MORGAN, PJ ^{[1
]}

THOMPSON, M ^{[1
]}

DAVIDSON, G ^{[1
]}

LAWSON, W ^{[1
]}

HASTINGS, MH ^{[1
]}

机构：

[1] ROWETT RES INST,BUCKSBURN AB2 9SB,ABERDEEN,SCOTLAND

来源：

MOLECULAR AND CELLULAR ENDOCRINOLOGY | 1994年 / 99卷 / 01期

关键词：

PARS TUBERALIS; PHOSPHOLIPASE; SIGNAL TRANSDUCTION; MELATONIN; PHOSPHATIDIC ACID;

D O I：

10.1016/0303-7207(94)90148-1

中图分类号：

Q2 [细胞生物学];

学科分类号：

071009 ; 090102 ;

摘要：

The potential role of phospholipases in mediating melatonin-dependent inhibition of adenylyl cyclase was investigated in pars tuberalis (PT) cultures. The phorbol ester 12-0-tetradecanoylphorbol 13-acetate (TPA) stimulated the release of choline metabolites and increased the transphosphatidylation reaction. The calcium ionophore A23187 stimulated the release of arachidonic acid from cultures. These observations demonstrate phospholipase A and D activities within PT. Phosphatidic acid inhibited forskolin-stimulated production of cyclic AMP both in PT cells and in membrane preparations. This indicates that melatonin could inhibit adenylyl cyclase by increasing phosphatidic acid levels through activation of cellular phospholipases. Melatonin did not stimulate the release of arachidonic acid or choline from PT cultures, nor did it increase intracellular levels of hydrophobic second messengers or stimulate transphosphatidylation. Therefore melatonin does not stimulate phospholipase A and D pathways in PT cells. However, these pathways are present in the PT and their activation could potentially modulate the cellular actions of melatonin.

引用

页码：73 / 79

页数：7

共 34 条

[1] INOSITOL TRISPHOSPHATE AND DIACYLGLYCEROL AS 2ND MESSENGERS [J].