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Electrochemical modulation of plasma fibronectin surface conformation enables filament formation and control of endothelial cell-surface interactions

机译:血浆纤连蛋白表面构象的电化学调制可形成细丝并控制内皮细胞-表面相互作用

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摘要

The control of cell behavior to increase biocompatibility of implantable medical devices can be improved by protein coatings. Plasma fibronectin (FN) is a circulating soluble protein capable of assembling into insoluble filaments, fibrils and networks which promote various cellular processes and tissue integrity. FN fibrillogenesis is initiated by a conformational change, which has been proposed to involve charge-mediated opening of its structure. In this study, we have used a bare gold surface polarized electrochemically in the double-layer region to modulate its charge from highly positive to highly negative. The negatively charged surface promoted molecular extension and assembly of FN into beaded filaments and creation of a stable protein coating as examined by atomic force microscopy and electrochemical differential capacitance measurements. Gold surfaces with open and filamentous FN showed significantly improved endothelial cell adhesion while allowing formation of cell-cell contacts. Such surfaces may be used to promote rapid endothelialisation of cardiovascular stents.
机译:蛋白涂层可改善对细胞行为的控制,以增加可植入医疗设备的生物相容性。血浆纤连蛋白(FN)是一种循环可溶性蛋白,能够组装成不溶性细丝,原纤维和网络,从而促进各种细胞过程和组织完整性。 FN原纤维形成是由构象变化引发的,该构象变化被认为涉及电荷介导的结构开放。在这项研究中,我们在双层区域中使用了电化学极化的裸露金表面,以将其电荷从高度正向调制为高度负向。带负电的表面促进了FN的分子延伸和组装成串珠状细丝,并通过原子力显微镜和电化学差分电容测量来检测了稳定的蛋白质涂层的形成。带有开放性和丝状FN的金表面显示出明显改善的内皮细胞粘附性,同时允许形成细胞间接触。这样的表面可以用于促进心血管支架的快速内皮化。

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