“Click” Conjugation of Peptide on the Surface of Polymeric Nanoparticles for Targeting Tumor Angiogenesis
作者:Stéphanie Deshayes、Victor Maurizot、Marie-Claude Clochard、Cécile Baudin、Thomas Berthelot、Stéphane Esnouf、Didier Lairez、Michel Moenner、Gérard Déléris
DOI:10.1007/s11095-011-0398-5
日期:2011.7
Angiogenesis plays a critical role in tumor growth. This phenomena is regulated by numerous mediators such as vascular endothelial growth factor (VEGF). CBO-P11, a cyclo-peptide, has proven to specifically bind to receptors of VEGF and may be used as targeting ligand for tumor angiogenesis. We herein report the design of novel nanoparticles conjugated to CBO-P11 in order to specifically target tumor site. The conjugation of CBO-P11 on the surface of poly(vinylidene fluoride) (PVDF) nanoparticles was investigated using the copper(I)-catalyzed Huisgen 1,3-dipolar cycloaddition known as “click” reaction. CBO-P11 was modified with a near-infrared cyanine dye bearing an alkyne function, allowing both “click” coupling on azido-modified nanoparticles and fluorescence labelling. Each step of this nanodevice construction was judiciously performed in aqueous solution and successfully characterized. The cytotoxicity of nanoparticles was evaluated in human brain endothelial cell line and their affinity for VEGF receptors was determined via fluorescence-based uptake assays on porcine aortic endothelial cell line. Nanoparticles were found to be spherical, dense, monodisperse and stable. No cytotoxicity was observed after four days of incubation demonstrating the biocompatibility of nanoparticles. Fluorescence highlighted the specific interaction of these functionalized nanoparticles for VEGF receptors, suggesting that the targeting peptide bioactivity was retained. These results demonstrate the potential of these functionalized nanoparticles for targeting tumor angiogenesis and their possible use as multifunctional plateform for cancer treament if coupled with therapeutic agents.
血管生成在肿瘤生长中起着关键作用,这一现象受到多种介质的调控,如血管内皮生长因子(VEGF)。CBO-P11是一种环肽,已被证明能特异性地结合VEGF受体,并可能作为肿瘤血管生成的靶向配体。本文报告了我们将CBO-P11共价连接到新型纳米颗粒上的设计,以特异性地靶向肿瘤部位。通过铜(I)催化的Huisgen 1,3-偶极环加成反应(即“点击”反应),研究了CBO-P11在聚偏氟乙烯(PVDF)纳米颗粒表面的共价连接。CBO-P11被修饰上了一种具有炔基的近红外菁染料,使其既能与叠氮基修饰的纳米颗粒进行“点击”耦合,又能进行荧光标记。这一纳米装置构建的每一步都在水溶液中精心进行,并成功进行了表征。纳米颗粒的细胞毒性在人脑内皮细胞系中进行了评估,并通过基于荧光的摄取实验在猪主动脉内皮细胞系中测定了其与VEGF受体的亲和力。结果发现纳米颗粒为球形、致密、单分散且稳定。经过四天的培养,未观察到细胞毒性,表明纳米颗粒具有生物相容性。荧光显微镜强调了这些功能化纳米颗粒与VEGF受体的特异性相互作用,表明靶向多肽的生物活性得以保留。这些结果表明,这些功能化纳米颗粒具有靶向肿瘤血管生成的潜力,并且在结合治疗药物时,有可能作为癌症治疗的多功能平台。