Effects of A Muscarinic Agonist on Octopamine-stimulated Cyclic AMP Production in American Cockroach (Periplaneta americana) Nerve Cords

Akinori Hirashima, Kazuhiko Oyama, Morifusa Eto

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

In the presence of 0.5 mM EGT A (a calcium chelator), the muscarinic agonist carbachol at 0.1 mM inhibited octopamine-stimulated cyclic AMP (cAMP) production in intact ventral nerve cords of Periplaneta americana. This effect was reduced by the addition of 0.1 mM atropine (a muscarinic antagonist), suggesting that the effect is mediated via muscarinic acetylcholine receptors (mAChR). This inhibitory effect of carbachol was not observed in the synaptosomes of nerve cords, suggesting that the inhibitory effect was not due to direct coupling of the mAChR to adenylate cyclase but mediated by other second messengers. The inhibitory effect seems to be due to an increase in the intracellular calcium level. In the presence of exogeneous extracellular 0.25 mM Ca2+ the octopamine-stimulated cAMP production was lower than that in the absence of extracellular Ca2+, and the cAMP levels were not further reduced by adding carbachol to the octopamine-stimulated cAMP production system. Washing did not remove all of the inhibitory activity of carbachol in intact nerve cords, indicating that carbachol modulated octopaminergic neurotransmission irreversibly.

本文言語英語
ページ(範囲)2547-2552
ページ数6
ジャーナルAgricultural and Biological Chemistry
55
10
DOI
出版ステータス出版済み - 1991

!!!All Science Journal Classification (ASJC) codes

  • 生化学、遺伝学、分子生物学(全般)
  • 農業および生物科学(全般)

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