大黄素对小肠运动的影响及其机制

目的　研究大黄素 (emodin)对便秘小鼠小肠运动的影响 ,并探讨其作用机制。方法　通过小肠炭末推进实验和木糖吸收实验 ,观察大黄素对便秘小鼠小肠运动的影响 ;通过小鼠离体翻转小肠囊的方法 ,观察大黄素对小肠葡萄糖 -钠转运电位 (PD)的影响 ,借以了解其对与PD关系密切的Na+ ,K+ ATP酶的影响。结果　大黄素 0 1和 0 2 g·kg- 1灌胃给药可以明显增强小鼠小肠炭末推进运动 ,影响小肠对木糖的吸收 ;高糖K H液配制的大黄素 0 2、0 4、0 8和 1 6g·L- 1均可明显降低小鼠离体小肠PD ,而无糖K H液配制的大黄素则无此作用。结论　大黄素可促进小肠蠕动 ,这一作用与其抑制Na+ ,K+ ATP酶的活性有关

Effect and mechanism of emodin on intestinal movement

AIM To examine the effect and mechanism of emodin on intestinal movement of constipation model. METHODS The movement of charcoal powder and the absorption of D-xylose into serum were observed. The electrical p otential difference(PD) related to Na + and glucose transport was measured across the wall of rev erted intestinal sacs. RESULTS Emodin 0 1, 0 2 g·kg -1 incr eased markedly the rate of charcoal powder moving and inhibited the absorption of D-xylose into serum. Emodin 0 2, 0 4, 0 8 and 1 6 g·L -1 decreased PD when ther e was glucose. However, emodin had little effect when glucose was free. CONCLUSION Emodin promotes intestinal movement and this effect is related to Na +,K +-ATPase.