Endothelial targeting of polymeric nanoparticles stably labeled with the PET imaging radioisotope iodine-124.

Endothelial targeting of polymeric nanoparticles stably labeled with the PET imaging radioisotope iodine-124.
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用 PET 成像放射性同位素碘 124 稳定标记的聚合物纳米颗粒的内皮靶向。

DOI:
10.1016/j.biomaterials.2012.04.036
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发表时间:
2012-07
期刊:
影响因子:
14
通讯作者:
Muzykantov, Vladimir R.
Muzykantov, Vladimir R.
中科院分区:
工程技术1区
文献类型:
--
作者:
Simone, Eric A.;Zern, Blaine J.;Chacko, Ann-Marie;Mikitsh, John L.;Blankemeyer, Eric R.;Muro, Silvia;Stan, Radu V.;Muzykantov, Vladimir R.

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靶向内皮细胞的治疗或显像剂有可能提高许多疾病治疗的特异性和有效性。实现这一目标的一种策略是使用纳米颗粒(NPs)靶向内皮细胞,通过存在于该组织上的蛋白质决定体,包括细胞粘附分子、肽酶和细胞受体。然而,从NPs分离放射性标记探针带来了重大问题。在这项研究中,我们设计了直接用放射性碘同位素(包括位置发射断层扫描(PET)同位素124I)标记的聚合物NPs,并表征了它们针对特定内皮决定因素的靶向性。这种方法为活体动物内皮表面决定因素的非侵入性特异性检测提供了相当大的、可靶向的探针。放射性标签与NPs的直接结合允许组织分布的稳定纵向跟踪,即使在侵略性蛋白水解环境中也不会出现标签脱离。此外,该方法允许在使用微pet成像的小鼠肺部实时和无创成像中跟踪NP药代动力学。该策略的使用将大大改善NP与靶细胞相互作用的研究和小动物的PET成像,最终有助于优化靶向药物递送。
Targeting of therapeutics or imaging agents to the endothelium has the potential to improve specificity and effectiveness of treatment for many diseases. One strategy to achieve this goal is the use of nanoparticles (NPs) targeted to the endothelium by ligands of protein determinants present on this tissue, including cell adhesion molecules, peptidases, and cell receptors. However, detachment of the radiolabel probes from NPs poses a significant problem. In this study, we devised polymeric NPs directly labeled with radioiodine isotopes including the position emission tomography (PET) isotope 124I, and characterized their targeting to specific endothelial determinants. This approach provided sizable, targetable probes for specific detection of endothelial surface determinants non-invasively in live animals. Direct conjugation of radiolabel to NPs allowed for stable longitudinal tracking of tissue distribution without label detachment even in an aggressive proteolytic environment. Further, this approach permits tracking of NP pharmacokinetics in real-time and non-invasive imaging of the lung in mice using micro-PET imaging. The use of this strategy will considerably improve investigation of NP interactions with target cells and PET imaging in small animals, which ultimately can aid in the optimization of targeted drug delivery.
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