張娟娟 張慶琳 盧燕 陳道峰
[摘要] 為建立補體抑制活性魚腥草總多糖中內毒素的去除方法,將瓊脂糖疏水色譜及聚丙烯酰胺凝膠過濾色譜分別與多粘菌素親和吸附色譜聯用純化魚腥草多糖。以顯色基質比色法檢測純化前后內毒素的含量變化,細胞溶血法檢測純化前后體外抗補體活性變化。結果發現,疏水色譜與親和吸附色譜的聯用對內毒素的清除效果優于凝膠過濾色譜與親和吸附色譜的聯用,其清除率達42.85%。內毒素清除前后,抗補體活性沒有明顯變化。表明疏水色譜與親和吸附色譜聯用可用于清除魚腥草總多糖中的內毒素且不影響其抗補體活性。
[關鍵詞] 魚腥草總多糖; 內毒素; 抗補體; 疏水色譜; 親和吸附色譜
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為三白草科Saururaceae蕺菜屬植物蕺菜Houttuynia cordata Thunb.的新鮮全草和干燥的地上部分,具有利尿通淋、抗炎抗過敏、增強機體免疫力等功效[13]。補體系統(complement system)是將對病原體的識別有效地轉化為宿主對最初感染發揮防御功能的主要機制之一。補體的過度激活會引起人體免疫系統的過度反應,參與多種疾病的病理過程[4],臨床上目前尚無理想的治療藥物。近年來,本課題組致力于中藥補體抑制劑的研究,分離得到了一些高效、低毒的小分子化合物及大分子多糖類天然補體抑制劑[58]。其中,魚腥草總多糖抗補體活性較強[9],同時具有顯著的解熱和防治內毒素(lipopolysaccharides,LPS)誘導的急性肺損傷藥效[1011],臨床開發應用前景良好。
LPS是革蘭陰性細菌的細胞壁外層上的特有結構,在革蘭陰性細菌感染與疾病演化中起到重要作用。……