A specific inhibitor of cytosolic phospholipase A2 activity, AACOCF3, inhibits glucose-induced insulin secretion from isolated rat islets.
In pancreatic beta-cells, arachidonic acid accumulation results primarily from phospholipid hydrolysis by phospholipase A2, and activation of this enzyme has been shown to accompany glucose-induced insulin secretion. Inhibitors of phospholipase A2 attenuate the secretory response, although the compounds used to date have not discriminated between cytosolic and secretory isoforms of phospholipase A2. In this work, the specific cytosolic phospholipase A2 inhibitor, AACOCF3, caused a dose-dependent inhibition of glucose-induced insulin secretion from isolated rat islets and this response was significantly relieved by exogenous arachidonic acid. The results suggest that, despite the low levels of expression of cytosolic phospholipase A2 in rat islets, this enzyme contributes to the control of glucose-induced insulin secretion in rat pancreatic beta-cells.
Loweth
A C
AC
Department of Biological Sciences, Keele University, Staffordshire, UK.
Scarpello
J H
JH
Morgan
N G
NG
D000818:Animals; D016718:Arachidonic Acid / Q000494:pharmacology; D001095:Arachidonic Acids / Q000494:pharmacology*; D002478:Cells, Cultured; D003600:Cytosol / Q000201:enzymology; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005947:Glucose / Q000494:pharmacology; D006801:Humans; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000201:enzymology / Q000378:metabolism*; D010741:Phospholipases A / Q000037:antagonists & inhibitors*; D054467:Phospholipases A2; D051381:Rats; D017208:Rats, Wistar; D012636:Secretory Rate / Q000187:drug effects
D001095:Arachidonic Acids; D004791:Enzyme Inhibitors; D007328:Insulin; C081565:arachidonyltrifluoromethane; D016718:Arachidonic Acid; D010741:Phospholipases A; D054467:Phospholipases A2; D005947:Glucose