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논문 기본 정보

자료유형
학술저널
저자정보
Park, Hyeon-Gyoon (Department of Pharmacology, College of Medicine, Chosun University) Lee, Byung-Rai (Department of Molecular and Biochemistry, College of Medicine, Chosun University) Lim, Dong-Yoon (Department of Pharmacology, College of Medicine, Chosun University)
저널정보
한국응용약물학회 The journal of applied pharmacology : the official journal of the Korean Society of Applied Pharmacology The journal of applied pharmacology : the official journal of the Korean Society of Applied Pharmacology 제11권 제1호
발행연도
2003.1
수록면
33 - 40 (8page)

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The present study was designed to investigate the effects of green tea extract (CUMC6335) and epigallocatechin gallate (EGCG) on secretion of catecholamines (CA) in the isolated perfused rat adrenal gland. ill the presence of CUMC6335 (100 $\mu\textrm{g}$/mL) into an adrenal vein for 60 min, CA secretory responses evoked by ACh(5.32 mM), high $K^+$ (56 mM) and Bay-K-8644 (10$\mu$M for 4 min) from the isolated perfused rat adrenal glands were greatly inhibited in a time-dependent fashion. However, EGCG (8 $\mu\textrm{g}$/mL) did not affect CA release evoked by ACh, high $K^+$ and Bay-K-8644. CUMC6335 itself did fail to affect basal catecholamine output. Taken together, these results demonstrate that CUMC6335 inhibits greatly CA secretion evoked by stimulation of cholinergic nicotinic receptors as well as by the direct membrane deplarization from the isolated perfused rat adrenal gland. It is felt that this inhibitory effect of CUMC6335 may be due to blocking action of the L-type dihydropyridine calcium channels in the rat adrenal medullary chromaffin cells, which is relevant to the cholinergic nicotinic blockade. It seems that there is a big difference in mode of action between CUMC6335 and EGCG.

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