Summary
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1.
The role of calcium for PGE release in the activation of phospholipase A2 by bradykinin and the divalent cation ionophore A 23187 was investigated in the isolated perfused rabbit ear.
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2.
PGE release induced by intra-arterial injection of phospholipase A2 was diminished during perfusion with calcium-free Tyrode's solution and abolished during perfusion with calcium-free, 1 mM EGTA-containing solution.
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3.
PGE release induced by intra-arterial injection of bradykinin remained unchanged in calcium-free and calcium-free, 1 mM EGTA-containing solution. Addition of 3 mM EGTA to calcium-free perfusion solution reduced PGE release evoked by bradykinin.
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4.
A 23187, dose-dependently released PGE. The release of PGE induced by a single intra-arterial dose lasted for more than 60 min, in contrast to the much more shortlasting release induced by bradykinin. Infusion of A 23187 caused a steadily increasing release of PGE.
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5.
A 23187-induced PGE release was not inhibited during perfusion with a calcium-free solution. Addition of 1 mM or 3 mM EGTA to the calcium-free solution reduced PGE release following injection of A 23187.
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6.
Basal release of PGE remained unchanged during perfusion with calcium-free (without or with EGTA) and “high” (9 mM) calcium-containing solution.
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7.
The results suggest that bradykinin appears to activate an endogenous phospholipase A2 only to a small part by increasing a transfer of extracellular calcium into the cell. The main part of phospholipase A2-activation by bradykinin remains unexplained. In contrast, A 23187 is assumed to activate a phospholipase A2 mainly by increasing a calcium-influx. The activated phospholipase A2, thereafter, initiates the release of PGE.
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This investigation was supported by the Grant No. 3092 from the Fond zur Förderung der wissenschaftlichen Forschung in Österreich
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Juan, H. Role of calcium in prostaglandin E release induced by bradykinin and the ionophore A 23187. Naunyn-Schmiedeberg's Arch. Pharmacol. 307, 177–183 (1979). https://doi.org/10.1007/BF00498461
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DOI: https://doi.org/10.1007/BF00498461