通过空间受限的多价基于 DNA 的纳米粒子选择性整合素 αβ 靶向。
Selective Integrin αβ Targeting through Spatially Constrained Multivalent DNA-Based Nanoparticles.
机构信息
Programmable Biomaterials Laboratory, Institute of Materials, School of Engineering, Ecole Polytechnique Fédérale Lausanne, 1015 Lausanne, Switzerland.
Interfaculty Bioengineering Institute, School of Engineering, Ecole Polytechnique Fédérale Lausanne, 1015 Lausanne, Switzerland.
出版信息
Molecules. 2022 Aug 4;27(15):4968. doi: 10.3390/molecules27154968.
Targeting cells specifically based on receptor expression levels remains an area of active research to date. Selective binding of receptors cannot be achieved by increasing the individual binding strength, as this does not account for differing distributions of receptor density across healthy and diseased cells. Engaging receptors above a threshold concentration would be desirable in devising selective diagnostics. Integrins are prime target candidates as they are readily available on the cell surface and have been reported to be overexpressed in diseases. Insights into their spatial organization would therefore be advantageous to design selective targeting agents. Here, we investigated the effect of activation method on integrin αβ clustering by immunofluorescence and modeled the global neighbor distances with input from an immuno-staining assay and image processing of microscopy images. This data was used to engineer spatially-controlled DNA-scaffolded bivalent ligands, which we used to compare trends in spatial-selective binding observed across HUVEC, CHO and HeLa in resting versus activated conditions in confocal microscopy images. For HUVEC and CHO, the data demonstrated an improved selectivity and localisation of binding for smaller spacings ~7 nm and ~24 nm, in good agreement with the model. A deviation from the mode predictions for HeLa was observed, indicative of a clustered, instead of homogeneous, integrin organization. Our findings demonstrate how low-technology imaging methods can guide the design of spatially controlled ligands to selectively differentiate between cell type and integrin activation state.
基于受体表达水平靶向特定细胞仍然是目前活跃的研究领域。通过增加单个结合强度来实现受体的选择性结合是不可能的,因为这不能解释受体密度在健康细胞和患病细胞之间的不同分布。在设计选择性诊断方法时,希望能够达到超过阈值浓度的受体结合。整合素是主要的靶标候选物,因为它们在细胞表面很容易获得,并且据报道在疾病中过度表达。因此,深入了解它们的空间组织将有利于设计选择性靶向药物。在这里,我们通过免疫荧光研究了激活方法对整合素 αβ 聚集的影响,并使用免疫染色测定和显微镜图像的图像处理输入来模拟全局邻居距离。利用这些数据设计了空间控制的 DNA 支架二价配体,我们使用这些配体在共聚焦显微镜图像中比较了在静止和激活条件下,HUVEC、CHO 和 HeLa 中观察到的空间选择性结合的趋势。对于 HUVEC 和 CHO,数据表明,在较小的间隔7nm 和24nm 处,结合的选择性和定位得到了改善,与模型一致。HeLa 出现了偏离模式预测的情况,表明整合素组织呈簇状,而不是均匀分布。我们的研究结果表明,低技术成像方法如何指导空间控制配体的设计,以选择性地区分细胞类型和整合素激活状态。