The Targeting Behavior of Folate-Nanohydrogel Evaluated by Near Infrared Imaging System in Tumor-Bearing Mouse Model
作者:Jian Zhang、Dawei Deng、Zhiyu Qian、Fei Liu、Xinyang Chen、Lianxiao An、Yueqing Gu
DOI:10.1007/s11095-009-0005-1
日期:2010.1
To synthesize P[(Folate-Allylamine)-co-(N-isopropylacrylamine)- co-Acrylamide] (P(FoAAn-co-NIPA-AAm), folate-NHG) with appropriate diameter and lower critical solution temperature (LCST) for targeting to folate receptor (FR) expressing tumors. Folate-NHG was synthesized by free-radical precipitation polymerization method reported in our previous work and other reports. LCST, diameter and morphology of folate-NHG were characterized by UV-vis spectrophotometer, laser particle size analyzer (LPSA) and transmission electron microscope (TEM), respectively. No.12 near infrared dye (NIRD-12) was entrapped into folate-NHG by hydrophobic association to trace the in vivo dynamic behavior of folate-NHG. This process was evaluated by a homemade near infrared (NIR) imaging system. Spherical folate-NHG with diameter of about 50 nm and LCST of about 40°C was successfully synthesized. The photo stability of NIRD-12 was strengthened after being entrapped into folate-NHG, which enabled NIRD-12 to better trace the in vivo dynamic process of folate-NHG. Folate-NHG showed good targeting capability for all three folate receptor expressing tumor models (SMMC-7721, Bel-7402 and HeLa) with different sizes, and this accumulation could last for more than 96 h. D-folate-NHG, synthesized with double amount of FoAAn, showed better targeting effect for SMMC-7721 tumor model than that of folate-NHG. Folate-NHG could actively accumulate in three models of folate receptor positive tumors with different sizes and keep retention for more than 96 h, which enables it to be used as a diagnostic reagent or anti-tumor drug carrier for tumor therapy.
合成具有适当直径和较低临界溶液温度(LCST)的 P[(叶酸-烯丙基胺)-共-(N-异丙基丙烯酰胺)-共丙烯酰胺](P(FoAAn-co-NIPA-AAm),叶酸-NHG),用于靶向叶酸受体(FR)表达的肿瘤。叶酸-NHG 是通过自由基沉淀聚合法合成的,这在我们之前的工作和其他报告中已有报道。紫外可见分光光度计、激光粒度分析仪(LPSA)和透射电子显微镜(TEM)分别对叶酸-NHG的LCST、直径和形态进行了表征。通过疏水作用将 12 号近红外染料(NIRD-12)包裹在叶酸-NHG 中,以追踪叶酸-NHG 在体内的动态行为。自制的近红外成像系统对这一过程进行了评估。成功合成了直径约为 50 nm 的球形叶酸-NHG,其 LCST 约为 40°C。NIRD-12被包裹在叶酸-NHG中后,其光稳定性得到了增强,这使得NIRD-12能够更好地追踪叶酸-NHG的体内动态过程。叶酸-NHG对三种不同大小的叶酸受体表达肿瘤模型(SMMC-7721、Bel-7402和HeLa)均表现出良好的靶向能力,这种积累可持续96 h以上。与叶酸-NHG相比,用双倍量的FoAAn合成的D-叶酸-NHG对SMMC-7721肿瘤模型的靶向效果更好。叶酸-NHG能在三种不同大小的叶酸受体阳性肿瘤模型中活性蓄积,并能保持96 h以上,可用作肿瘤治疗的诊断试剂或抗肿瘤药物载体。