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      저자 : Kaili Hu (검색결과 1 건)
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        Improved Antitumor Efficacy and Reduced Toxicity of Liposomes Containing Bufadienolides

        Kaili Hu,Fuqiang Hu,Jianfang Feng,Lin Zhu,Haiyuan Liang 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.9

        Long-circulating liposomes are used extensively nowadays for enhancing the therapeutic effect and reducing the toxicity of anticancer drugs. In this paper, a traditional Chinese medicine, toad venom, which has long been used in the clinic for tumor therapy with unpleasant side effects, was incorporated into poloxamer modified liposomes to increase its antitumor effect and reduce its toxicity. Our preparation of bufadienolides liposomes had a particle size of around 70 nm and an entrapment efficiency of about 87.6%. Lyophilized liposomes well retained their appearance, particle size and encapsulation efficiency for 3 months. The in vitro release results verified the sustained release properties of the bufadienolides liposomes. The concentration of bufadienolides in modified liposomes that caused 50% cell killing was much lower than that of free drug for both Lovo cells and NCI-H157 cells. Compared to the bufadienolides solution and the unmodified liposomes, the bufadienolides liposomes significantly prolonged the retention time and increased the area under the curve in vivo. The antitumor efficiency of the bufadienolides liposomes against mice bearing H22 liver cancer cells and Lewis pulmonary cancer cells were 2.15 and 2.96, respectively, times that of a bufadienolides solution at the same toxicity. The safety test results demonstrated that the bufadienolides liposomes had an LD_50 that was 3.5 times the LD_50 of bufadienolides solution and caused no allergen-related or blood vessel irritation effects. All these results proved that poloxamer modified bufadienolides liposomes have improved antitumor efficacy and safety.

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