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자료유형
학술저널
저자정보
Lim, Dong-Yoon (Department of Pharmacology, College of Medicine, Chosun University) Jang, Seok-Jeong (Department of Neurosurgery, College of Medicine, Chosun University) Kim, Kwang-Cheol (Department of Pharmacology, College of Medicine, Chosun University)
저널정보
대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제25권 제6호
발행연도
2002.1
수록면
932 - 939 (8page)

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The aim of the present study was to determine the characteristics of cytisine on the secretion of catecholamines (CA) in isolated perfused rat adrenal glands, and to clarify its mechanism of action. The release of CA evoked by the continuous infusion of cytisine ($1.5{\times}10^{-5} M$) was time-dependently reduced from 15 min following the initiation of cytisine infusion. Furthermore, upon the repeated injection of cytisine ($5{\times}10^{-5}$), at 30 min intervals into an adrenal vein, the secretion of CA was rapidly decreased following the second injection. Tachyphylaxis to the release of CA was observed by the repeated administration of cytisine. The cytisine-induced secretion of CA was markedly inhibited by pretreatment with chlorisondamine, nicardipine, TMB-8, and the perfusion of $Ca^{2+}$-free Krebs solution, while it was not affected by pirenzepine or diphenhydramine. Moreover, the secretion of CA evoked by ACh was time-dependently inhibited by the prior perfusion of cytisine ($5{\times}10^{-6} M$). Taken together, these experimental data suggest that cytisine causes secretion of catecholamines from the perfused rat adrenal glands in a calcium-dependent fashion through the activation of neuronal nicotinic ACh receptors located in adrenomedullary chromaffin cells. It also seems that the cytisine-evoked release of catecholamine is not relevant to the activation of cholinergic M$_1$-muscarinic or histaminergic receptors.

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