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神经元样 PC12 细胞在光活性自组装单层上的图案化。

Neuron-like PC12 cell patterning on a photoactive self-assembled monolayer.

机构信息

Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Ontario, Canada, K1N 6N5.

出版信息

J Biomed Mater Res A. 2013 Nov;101(11):3066-75. doi: 10.1002/jbm.a.34615. Epub 2013 Mar 18.

Abstract

A new approach to pattern cells using photochemistry and self-assembled monolayer (SAM) was described in this study. Photocleavable 4,5-dimethoxy-2-nitrobenzyl chloroformate (NVOC) protected amine on an alkanethiol-gold SAM was developed for cell patterning. The cleavage of NVOC and the deprotection of amines on the SAM were controlled spatially by two sequential UV exposures with a photomask. Biomolecule patterning was achieved by introducing cell nonadhesive poly(ethylene glycol) after the first exposure and subsequently cell adhesive protein laminin after the second exposure to create surface cell adhesiveness differential for cell patterning. UV-Vis spectrophotometry was used to determine the photolysis of caged self-assembled molecules; in addition, water contact angle, atomic force microscopy, cyclic voltammetry, and X-ray photoelectron spectroscopy were used to characterize properties of different surfaces. To test the efficacy of resulting surfaces in patterning cells, a neuron-like cell line, PC12 cell line, was used. The in vitro cell studies showed successful PC12 cell patterns on the photoactive SAM surfaces. This patterning technique is unique in that it does not rely on cell adhesive or nonadhesive properties of the starting base material as both cell adhesive and cell nonadhesive molecules were individually introduced onto the base material surface through photo-uncaging at preselected regions for the ultimate cell patterning.

摘要

本研究描述了一种使用光化学和自组装单分子层 (SAM) 对图案细胞的新方法。开发了一种用于细胞图案化的、在烷硫醇金 SAM 上带有光解保护胺的 4,5-二甲氧基-2-硝基苯甲酰氯甲酸酯 (NVOC)。通过使用光掩模进行两次顺序的 UV 曝光,可对 NVOC 的裂解和 SAM 上的胺脱保护进行空间控制。通过第一次曝光后引入非细胞黏附性聚乙二醇 (PEG),然后在第二次曝光后引入细胞黏附性蛋白层粘连蛋白,从而在表面上产生细胞黏附性差异,实现生物分子图案化。使用 UV-Vis 分光光度法测定笼状自组装分子的光解;此外,还使用水接触角、原子力显微镜、循环伏安法和 X 射线光电子能谱法来表征不同表面的性能。为了测试所得表面在细胞图案化中的效果,使用了一种类似于神经元的 PC12 细胞系。体外细胞研究表明,PC12 细胞在光活性 SAM 表面上成功图案化。这种图案化技术的独特之处在于,它不依赖于起始基底材料的细胞黏附或非黏附特性,因为通过光解笼,细胞黏附性和非黏附性分子都可以单独引入基底材料表面的预选区域,从而实现最终的细胞图案化。

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