Role of Cyclic AMP in Prostaglandin-Induced Modulation of Acetylcholine Release from the Myenteric Plexus of Guinea Pig Ileum.
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概要
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Prostaglandins (PGs) have modulatory effects on spontaneous and nicotine-induced release of acetylcholine (ACh) from the myenteric plexus of guinea pig ileum. To determine whether cyclic AMP is involved in the mechanisms of these effects, we studied ACh release under conditions that inhibit PG synthesis. Indomethacin (IND), a cyclooxygenase inhibitor, inhibited ACh release concentration-dependently. The effect of the maximally inhibitory concentration of IND (2.8 μM) on nicotine-induced ACh release were reversed concentration-dependently by PGE<SUB>2</SUB>, forskolin, 3-isobutyl-1-methylxanthine (IBMX) and 8-bromo cyclic AMP. These compounds caused concentration-dependent reversal of the inhibition of spontaneous ACh release by IND, but their concentrations for restoration of spontaneous release were higher than those for restoration of nicotine-induced release. The effects of PGE<SUB>2</SUB> and forskolin or IBMX were not additive in reversing the inhibition of nicotine-induced ACh release by IND. Neither forskolin nor 8-bromo cyclic AMP alone had any significant effect on either release. These results showed that increase in the level of cyclic AMP in myenteric cholinergic neurons restored ACh release from the tissue whose PG level had been lowered by IND and indicated that endogenous PGs may modulate the level of intraneuronal cyclic AMP.
- 公益社団法人 日本薬理学会の論文
著者
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Takeuchi Tadayoshi
Department Of Veterinary Pharmacology Graduate School Of Agriculture And Life Sciences Osaka Prefect
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Yagasaki Osamu
Department Of Pharmacology College Of Agriculture
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HATA Fumiaki
Department of Pharmacology I, Osaka University School of Medicine
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TAKEUCHI Tadayoshi
Department of Veterinary Pharmacology, Faculty of Agriculture, University of Osaka Prefecture
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