괴각(Sophorae Fructus) 메탄올 추출물의 항불안 효과
Anxiolytic-like Effects of the Methanol Extract of Sophorae Fructus
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초록
괴각 추출물의 항불안 효능을 탐색하기 위하여 elevated plus-maze, horizontal wire test 및 open field test와 같은 동물 행동실험을 통하여 비교한 결과 다음과 같은 결론을 얻었다. Elevated plus-maze를 이용한 본 연구에서 괴각 추출물의 100 mg/kg, 200 mg/kg 및 400 mg/kg 투여군에서 대조군에 비하여 open arm에서 머무른 시간의 백분율이 증가하였고, open arm으로의 출입 백분율 또한 증가하였다. Elevated plus-maze를 이용한 길항실험에서는 benzodiazepine 수용체의 antagonist인 flumazenil에 의해 괴각 추출물 400 mg/kg의 항불안 효능이 차단되는 것이 관찰되었다. Locomotor activity 측정에서도 괴각 추출물의 모든 용량에서 총 이동거리의 변화가 없었으며, 또한 horizontal wire test에서도 대조군과 괴각 추출물 투여군 사이에 차이를 나타내지 않았다. 결론적으로, 본 연구의 결과에서 괴각의 메탄올 추출물이 elevated plus-maze test, horizontal wire test 및 open field test를 통하여 locomotor activity 및 근육이완이나 진정 등의 부작용이 없으면서 우수한 항불안 작용을 가지는 천연물이라고 생각되어지며 이러한 작용이 특히 GABA 신경계와 관련이 있음을 시사하고 있다. 향후 괴각의 항불안 작용의 평가를 위하여 다양한 실험모델의 개발이 필요할 것으로 생각되며 또한 이러한 작용에 대한 기전 연구가 포괄적이고 다각적으로 진행되어져야 할 필요성이 있다고 사료된다.
Abstract
The purpose of this study was to investigate the anxiolytic-like effect of the methanol extract of Sophorae fructus (MESF) using elevated plus-maze (EPM), open field test, and horizontal wire test in mice. MESF was orally administered at doses of 50, 100, 200, or 400 mg/kg to ICR mice 1 h before behavioral evaluation. The control group was given an equal volume of 10% Tween 80, and the positive control group was given diazepam (1 mg/kg, i.p.). The administration of MESF significantly increased the percentage of time spent in open arms and the entries into the open arms of the EPM compared with the 10% Tween 80-treated control group (p < 0.05). In addition, the anxiolytic-like activities of MESF were antagonized by flumazenil (a GABAA antagonist, 10 mg/kg) but not by WAY-100635 (a 5-HT1A antagonist, 0.3 mg/kg). Futhermore, there were no changes in the locomotor activity and myorelaxant effects of the experimental group, as opposed to the 10% Tween 80-treated control group. Therefore, these findings suggest that MESF promotes the anxiolytic-like activity mediated by the GABAergic nervous system in mice.
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