Synergism between thapsigargin and the phorbol ester 12-O-tetradecanoylphorbol 13-acetate on the release of [C]arachidonic acid and histamine from rat peritoneal mast cells
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Thapsigargin is a potent skin irritating sesquiterpene lactone isolated from the roots of Thapsia garganica L. (Apiaceae). In rat peritoneal mast cells thapsigargin induced a calcium-dependent non-cytotoxic [C]arachidonic acid and histamine release. A minor amount of the released [C]arachidonic acid was converted to [C]prostaglandin D. A potentiated effect was found between thapsigargin and 12--tetradecanoylphorbol 13-acetate, as well as between A23187 and the phorbol ester with respect to release of [C]arachidonic acid and histamine. It is suggested that the synergistic effect is due to activation of protein kinase C by 12-O-tetradecanoylphorbol 13-acetate and to increased intracellular calcium concentration mediated by A23187 as well as thapsigargin. [C]arachidonic acid was released mainly from phosphatidylcholine. It is suggested that this release may be due to an action of phospholipase A, and that protein kinase C is involved in activation of phospholipase A.
Originalsprog | Engelsk |
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Tidsskrift | Biochemical Pharmacology |
Vol/bind | 36 |
Udgave nummer | 5 |
Sider (fra-til) | 621-626 |
Antal sider | 6 |
ISSN | 0006-2952 |
Status | Udgivet - 1 mar. 1987 |
ID: 45561308