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补体抑制活性物质鱼腥草总多糖中内毒素的去除

2017-09-23张娟娟张庆琳卢燕陈道峰

中国中药杂志 2017年17期

张娟娟 张庆琳 卢燕 陈道峰

[摘要] 为建立补体抑制活性鱼腥草总多糖中内毒素的去除方法,将琼脂糖疏水色谱及聚丙烯酰胺凝胶过滤色谱分别与多粘菌素亲和吸附色谱联用纯化鱼腥草多糖。以显色基质比色法检测纯化前后内毒素的含量变化,细胞溶血法检测纯化前后体外抗补体活性变化。结果发现,疏水色谱与亲和吸附色谱的联用对内毒素的清除效果优于凝胶过滤色谱与亲和吸附色谱的联用,其清除率达42.85%。内毒素清除前后,抗补体活性没有明显变化。表明疏水色谱与亲和吸附色谱联用可用于清除鱼腥草总多糖中的内毒素且不影响其抗补体活性。

[关键词] 鱼腥草总多糖; 内毒素; 抗补体; 疏水色谱; 亲和吸附色谱

Removal of lipopolysaccharides from anticomplementary crude

polysaccharides of Houttuynia Herba

ZHANG Juanjuan, ZHANG Qinglin, LU Yan*, CHEN Daofeng

(School of Pharmacy, Fudan University, Shanghai 201203, China)

[Abstract] An AffiPrep Polymyxin column was combined with a Phenyl Sepharose column and a Sephacryl S300 column, respectively, to remove the lipopolysaccharides(LPS) in the anticomplementary crude polysaccharides of Houttuynia Herba. The contents of LPS in the polysaccharides were determined by chromogenic tachypleus amebocyte lysate(TAL)method during the procedure of purifying. The anticomplementary activities of the polysaccharides were also compared before and after the removal of LPS. Less remanent LPS was detected after purified using Penyl Sepharose combined with polymyxin column, with the clearance rate of 42.85%. All the columns had no effect on the anticomplementary activity of the polysaccharides. Penyl Sepharose combined with polymyxin column would be sound for LPS removal of the anticomplementary polysaccharides without reducing their bioactivity.

[Key words] crude polysaccharides of Herba Houttuynia; LPS; anticomplementary; Penyl Sepharose; polymyxin

魚腥草Houttuynia Herba为三白草科Saururaceae蕺菜属植物蕺菜Houttuynia cordata Thunb.的新鲜全草和干燥的地上部分,具有利尿通淋、抗炎抗过敏、增强机体免疫力等功效[13]。补体系统(complement system)是将对病原体的识别有效地转化为宿主对最初感染发挥防御功能的主要机制之一。补体的过度激活会引起人体免疫系统的过度反应,参与多种疾病的病理过程[4],临床上目前尚无理想的治疗药物。近年来,本课题组致力于中药补体抑制剂的研究,分离得到了一些高效、低毒的小分子化合物及大分子多糖类天然补体抑制剂[58]。其中,鱼腥草总多糖抗补体活性较强[9],同时具有显著的解热和防治内毒素(lipopolysaccharides,LPS)诱导的急性肺损伤药效[1011],临床开发应用前景良好。

LPS是革兰阴性细菌的细胞壁外层上的特有结构,在革兰阴性细菌感染与疾病演化中起到重要作用。……

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