肝靶向去甲斑蝥素微乳的研究

Studies on the liver targeting of norcantharindin microemulsion

目的 考察去甲斑蝥素 (NCTD)微乳的形态、粒径分布及生物安全性 ,研究去甲斑蝥素微乳及其注射液在小鼠体内的组织分布、药代动力学和体外药效学。方法 用气相法测定小鼠体内去甲斑蝥素含量。数据用 3P87处理 ,得到各主要药代动力学参数。采用体外细胞毒性和体内全身急性毒性试验方法 ,评价去甲斑蝥素微乳的抗肿瘤活性及其生物安全性。结果 微乳平均粒径为 (4 4± 9)nm。血浆中成分及制剂中辅料不干扰去甲斑蝥素测定。小鼠静脉注射去甲斑蝥素微乳及其去甲斑蝥素注射液后的药 时曲线均符合二室模型。去甲斑蝥素微乳的药代动力学研究表明 ,在同剂量条件下 ,NCTD微乳可在体内较长时间保持较高浓度 ,即可在一定程度上延长体内循环时间 ;微乳及注射液的AUC ,MRT ,T1 2 分别为 (2 9 7± 0 9) ,(9 2 5± 0 0 9)mg·h·L- 1 ,(110± 11) ,(86 7± 0 8) ,(10 3± 12 ) ,(4 2±4 )h ,NCTD微乳改变NCTD注射剂在小鼠体内的药时曲线和血药浓度的高低 ,其消除T1 2 和MRT比其注射剂分别增加了 2 4 8和 1 2 7倍 ,AUC增加了 3 2 1倍 ;NCTD微乳在肝、肾中的靶向指数分别为 0 4 3和 0 12。去甲斑蝥素微乳的生物安全性与其市售注射液比较无显著性差异。结论 去甲斑蝥素微乳较去甲斑蝥素注射液增强了药物的肝靶?

Aim To study the morphology, particle size distribution and biological reliability of the norcantharindin (NCTD)-loaded microemulsion and pharmacokinetics of the W/O norcantharidin-loaded microemulsion in mice. Methods The concentration of NCTD in plasma and tissues were determined by GC method. The data obtained were processed using 3P87 program. Results The mean particle diameter of microemulsion was (44±9) nm. The concentration-time curve of NCTD-loaded microemulsion and NCTD injection was fitted to a two-compartment model. At the same dosage, the pharmacokinetic study for NCTD-loaded microemulsion showed the NCTD microemulsion had relatively longer circulating time in mice. Area under the curve of concentration versus time (AUC), mean residence time (MRT) and half life (T 1/2) for microemulsion and injection were (29.7±0.9) mg·h·L -1, (9.25±0.09) mg·h·L -1, (110±11) h, (86.7±0.8) h, (103±12) h, (42±4) h, respectively. Targeting index of NCTD microemulsion in liver and kidney in mice were 0.43 and 0.12 after iv NCTD-loaded microemulsion. The effects of biological reliability was not significantly different between NCTD microemulsion and NCTD injection in vivo and in vitro.Conclusion The liver targeting absorptive capability of NCTD-loaded microemulsion was enhanced and the release time was extended compared with NCTD injection. While the microemulsion vehicles could decrease the kidney distribution of NCTD.