尿酸酶-过氧化氢酶脂质体的特性分析及药效学研究

摘要

Aim To observe the optimal temperature and optimal pH of uricase-catalase liposomes(UCALP) and free uricase(UAE), and study the abilities of UCALP to reduce uric acid and hydrogen peroxide in mice with hyperuricemia.Methods UCALP were prepared by reverse phase evaporation, optimal temperature and optimal pH of UCALP and UAE were determined, respectively.Mouse model of hyperuricemia was established by intraperitoneally injection of uric acid, and the model mice were intravenously injected UCALP and UAE, respectively, then the serum concentration of uric acid and hydrogen peroxide in mice at different time points were measured by the assay kits, respectively.Results Optimal temperature of UCALP and UAE was 40℃, and optimal pH was 8.0 and 8.5, respectively.UCALP could more significantly lower uric acid level of hyperuricemia mice than that of UAE, and the concentration of hydrogen peroxide in UCALP group was lower than in UAE group.Conclusion UCALP can effectively decrease the level of uric acid and control the level of hydrogen peroxide in mice with hyperuricemia.%目的 考察尿酸酶-过氧化氢酶脂质体(uricase and catalase liposome, UCALP)、游离尿酸酶(uricase, UAE)的最适温度和最适pH,并探究UCALP降低高尿酸血症小鼠的尿酸水平和过氧化氢水平的能力.方法 采用逆向蒸发法制备UCALP,并分别测定UCALP和UAE的最适温度和最适pH;小鼠腹腔注射尿酸建立高尿酸血症模型后,分别静脉注射UCALP和UAE,用测试盒分别测定不同时间点小鼠血清中尿酸浓度和过氧化氢的浓度.结果 UCALP和UAE的最适温度均为40℃,最适pH分别为8.0和8.5;在高尿酸血症的小鼠体内,UCALP比UAE降尿酸水平更明显,且UCALP组小鼠体内的过氧化氢浓度较UAE组低.结论 UCALP能有效降低高尿酸血症小鼠的尿酸水平,且能在一定程度上降低过氧化氢的浓度.