흰쥐 기관지평활근에 대한 황련류의 이완효능

• 영문명: Bronchodilatory Effects of Coptidis Rhizomas in Isolated Rat Trachea
• 발행기관: 대한약학회
• 저자명: 이동웅(Dong Ung Lee) 장기철(Ki Churl Chang)
• 간행물 정보: 『약학회지』제41권 제6호 (1997년), 797~801쪽, 전체 5쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 1997.12.31

영문 초록

Recently we reported that water extracts of Coptidis Rhizomas showed calcium antagonistic action and alpha-adrenoceptor inhibitory action in the vascular smooth muscle. Since calcium antagonistic properties are important in the treatment of various diseases including asthma. In the present study, the bronchodilatory effects of crude extract of three kinds of Coptidis Rhizoma (Coptidis chinensis, Coptis japonica and root hair of Coptis japonica) was investigated using rat isolated trachea. The result showed that all extracts relaxed carbachol-contracted tracheal smooth muscle. Concentration-dependently, in which the root hair of Coptis japonica was the least potent. The inhibitory potency expressed in terms of IC50 against carbachol contraction was 1.8mcg/ml and 2.7mcg/ml for Coptidis chinensis and Coptis japonica, respectively. These extracts also inhibited KCI-contracted tracheal smooth muscle. But the relative potency (IC50) was 3.5 and 4.1 folds weaker than carbachol-induced contraction for Coptidics chinenesis and Coptis japonica, respectively. Pretreatment of crude extracts also inhibited carbachol- or KCI-induced contraction, non-competitively. These findings indicate that the extracts have muscarinic blocking as well as Ca2+ channel blocking action. When provoked intracellular stored Ca2+ release by carbachol in Ca2+-free conditions, initial phasic contraction due to Ca2+ release was significantly inhibited by the extracts. As taken together, we conclude that water extracts of Coptidis Rhizoma may be beneficial in bronchospasm or other broncheal tube narrowing conditions such as asthma.

키워드

Coptidis rhizoma Ca2+ antagonist carbachol rat trachea intracellular Ca2+.