Preparation and characterization of MRI-active gadolinium nanocomposite particles for neutron capture therapy
作者:Heui Kyoung Cho、Hyun-Jong Cho、Saifullah Lone、Dae-Duk Kim、Jeong Hyun Yeum、In Woo Cheong
DOI:10.1039/c1jm11608h
日期:——
We demonstrate the synthesis and characteristics of MRI-active Gd2O3 core/SiO2 shell/poly(2-methacryloyloxyethyl phosphorylcholine) corona composite nanoparticles (Gd2O3@SiO2@PMPC NPs). The prepared NPs have a number of attractive features in cancer diagnosis and neutron capture therapy (NCT): biocompatibility, colloidal stability, low cytotoxicity, nucleus affinity, passive targeting, etc. Monodisperse and highly crystalline Gd2O3 NPs were prepared using a polyol protocol to control the average particle size and surface properties. The Gd2O3 NPs were then functionalized with SiO2 and a biomimetic layer of PMPC, to achieve reduced toxicity and enhanced nucleus affinity, for use as an MRI-active Gd-NCT agent. The size of the NPs was tailored to be from 50 to 100 nm for passive accumulation in tumor tissue through loosened capillary vessels. The morphologies and structures of Gd2O3, Gd2O3@SiO2–Br, and Gd2O3@SiO2@PMPC NPs were studied by FT-IR, XRD, HR-TEM, and TGA. In vitro cytotoxicity was investigated with three kinds of normal and cancer cells, and in vitro and in vivo MRI analyses were performed to confirm the contrast ability, accumulation, and sustentation of NPs in tumor tissues.
我们展示了MRI活性Gd2O3核心/SiO2壳/聚(2-甲基丙烯酰氧基乙基磷脂胆碱)冠状复合纳米粒子(Gd2O3@SiO2@PMPC NPs)的合成及其特征。所制备的纳米粒子具有在癌症诊断和中子俘获疗法(NCT)中若干吸引人的特性:生物相容性、胶体稳定性、低细胞毒性、亲核性、被动靶向等。采用聚醇法制备了单分散且高度结晶的Gd2O3纳米粒子,以控制平均粒径和表面特性。随后,这些Gd2O3纳米粒子被功能化以SiO2和生物仿生的PMPC层,以降低毒性并增强亲核性,从而作为MRI活性Gd-NCT剂使用。纳米粒子的尺寸被调整为50到100纳米,以便通过松弛的毛细血管实现被动累积于肿瘤组织。通过傅立叶变换红外光谱(FT-IR)、X射线衍射(XRD)、高分辨透射电子显微镜(HR-TEM)和热重分析(TGA)研究了Gd2O3、Gd2O3@SiO2–Br和Gd2O3@SiO2@PMPC纳米粒子的形态和结构。使用三种正常和癌症细胞进行了体外细胞毒性研究,并进行了体外和活体MRI分析,以确认纳米粒子在肿瘤组织中的对比能力、累积及维持。