Effects of Aconitum Alkaloid Kobusine and Pseudokobusine Derivatives on Cutaneous Blood Flow in Mice; II.
作者:Koji WADA、Satoshi ISHIZUKI、Takao MORI、Eiichi FUJIHIRA、Norio KAWAHARA
DOI:10.1248/bpb.23.607
日期:——
Aconitum alkaloids of the C20-diterpenoid type, kobusine (1) and pseudokobusine (2), their anisoyl, veratroyl, p-nitrobenzoyl, nicotinoyl or pivaloyl derivatives, and dehydrokobusine and N, 6-seco-6-dehydro-pseudokobusine derivatives were examined for their peripheral vaso-activities by laser-flowmetrical measurement of the cutaneous blood flow in the hind foot of mice after intravenous administraiton. Kobusine 15-anisoate (4), 11-veratroate (5), 15-veratroate (6), 11-pivaloate (9) and 15-pivaloate (10)-were significantly effective at a low dose of 0.5 or 0.05 mg/kg. Pseudokobusine derivatives were all avtive at 1, 0.5 or 0.05 mg/kg, and the effects of pseudokobusine 15-anisoate (13), 15-veratroate (16) and 15-p-nitrobenzoate (19) at 0.1 mg/kg were remarkable. Yesoline (26) and alkaloid (28) were significantly effective at a low dose of 1 mg/kg, whereas yesonine (25) and N-acetyl-N, 6-seco-6-dehydropseudokobusine (27) were inactive. Dehydrokobusine derivatives (29, 30) were significantly effective at a low dose of 0.5 or 0.1 mg/kg. It is thought that the hydroxyl groups of alkaloids, espectially a free OH group of 2 at C-6, are important for action on the peripheral vasculature leading to dilatation, and the results indicated that esterificaiton of the hydroxyl group at C-15 with either anisoate, veratroate or p-nitrobenzoate may contribute to enhancement of the activity of the parent alkaloids.
检查了 C20-二萜类乌头生物碱、kobusine (1) 和 pseudokobusine (2)、它们的茴香酰基、藜芦酰基、对硝基苯甲酰基、烟酰基或新戊酰基衍生物,以及脱氢kobusine 和 N,6-seco-6-dehydro-pseudokobusine 衍生物通过激光流量计测量静脉注射后小鼠后足的皮肤血流量来检测其外周血管活性。 Kobusine 15-茴香酸酯 (4)、11-藜芦酸酯 (5)、15-藜芦酸酯 (6)、11-新戊酸酯 (9) 和 15-新戊酸酯 (10) - 在 0.5 或 0.05 mg/kg 的低剂量下显着有效。伪新碱衍生物在1、0.5或0.05mg/kg时均具有活性,其中伪新碱15-茴香酸酯(13)、15-藜芦酸酯(16)和15-对硝基苯甲酸酯(19)在0.1mg/kg时作用显着。叶索碱 (26) 和生物碱 (28) 在 1 mg/kg 的低剂量下显着有效,而叶索宁 (25) 和 N-乙酰基-N, 6-seco-6-脱氢伪科布辛 (27) 则无活性。脱氢科布辛衍生物 (29, 30) 在 0.5 或 0.1 mg/kg 的低剂量下显着有效。据认为,生物碱的羟基,特别是 C-6 处的 2 个游离 OH 基团,对于导致扩张的外周脉管系统的作用很重要,并且结果表明,C-15 处的羟基与任一酯化茴香酸酯、藜芦酸酯或对硝基苯甲酸酯可能有助于增强母体生物碱的活性。