包有蓖麻毒蛋白的脂质体的制备、性质及毒性研究  被引量:19

Preparation, Characteristics and Toxicity of Ricin containing Galactosyl Ceramide Liposomes

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作  者:张今[1] 秦德安[1] 陈百先 鲁小青 李昊 李琳 杨慧萍 

机构地区:[1]华东师范大学生物系,上海200062 [2]甘泉医院,上海200070

出  处:《生物化学与生物物理学报》1999年第4期472-474,共3页

摘  要:以半乳糖神经酰胺(galactosylceramide,GC) 为材料, 采用冷冻干燥脱水再水化法(DRV 法)制成包裹有蓖麻毒蛋白的半乳糖神经酰胺脂质体(ricinGCLs), 并对其性质及体外细胞毒性和动物毒性做了研究。实验结果表明,ricinGCLs 的最大包封率可达74 .1 % , 粒度分布主要在0.5 ~0.8 μm 之间, 符合静脉注射液的标准。脂质体冻干粉在4 ℃储存近半年, 粒度分布几乎没有变化。体外细胞毒性实验结果表明,ricinGCLs 和游离蓖麻毒蛋白对人肝癌细胞7721 均有杀伤作用。RicinGCLs 的杀伤力比游离蓖麻毒蛋白更强;它们的细胞存活半数抑制浓度(IC50) 之比为1∶3 .89 。小鼠毒性试验中, 游离蓖麻毒蛋白的半数致死量(LD50) 为(30 .6 ±8 .49) μg/kg, 而ricinGCLs 的LD50 为(41.8 ±9.33) μg/kg, 高于游离蓖麻毒蛋白36 .29 % 。蓖麻毒蛋白经GCLs 包裹后, 提高了对人肝癌细胞7721 的杀伤力,Ricin containing galactosyl ceramide liposomes (ricin GCLs) lyophilized product was made by the dehydration rehydration vesicles(DRV) method and its toxicity to human heptocarcinoma cell line 7721 and to mice was investigated. The results indicated that the maximum encapsulation efficiency of ricin was 74.1%. The distribution of ricin GCLs' sizes accords with intravenous injection standard and changes little in half a year at 4 ℃. In the cytotoxicity assay, the ratio of ricin GCLs' to free ricin's IC 50 was 1.00∶3.89, which indicated that the ricin entrapped in GCLs was more effective than the free one in killing human heptocarcinoma cell line 7721. In vivo , the mice's LD 50 of ricin GCLs ((41.8±9.33) μg/kg)is more than that of free ricin ((30.6±8.49) μg/kg) by 36.29%. So, ricin entrapped in GCLs promotes its cytotoxicity and reduces its toxic side effect.

关 键 词:蓖麻毒蛋白 半乳糖神经酰胺 脂质体 细胞毒性 

分 类 号:R944.9[医药卫生—药剂学] R979.1[医药卫生—药学]

 

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