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首页> 外文期刊>Biomaterials >Mediating specific cell adhesion to low-adhesive diblock copolymers by instant modification with cyclic RGD peptides.
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Mediating specific cell adhesion to low-adhesive diblock copolymers by instant modification with cyclic RGD peptides.

机译:通过立即用环状RGD肽修饰,介导特定细胞对低粘附性二嵌段共聚物的粘附。

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摘要

One promising strategy to control the interactions between biomaterial surfaces and attaching cells involves the covalent grafting of adhesion peptides to polymers on which protein adsorption, which mediates unspecific cell adhesion, is essentially suppressed. This study demonstrates a surface modification concept for the covalent anchoring of RGD peptides to reactive diblock copolymers based on monoamine poly(ethylene glycol)-block-poly(D,L-lactic acid) (H(2)N-PEG-PLA). Films of both the amine-reactive (ST-NH-PEG(2)PLA(20)) and the thiol-reactive derivative (MP-NH-PEG(2)PLA(40)) were modified with cyclic alphavbeta3/alphavbeta5 integrin subtype specific RGD peptides simply by incubation of the films with buffered solutions of the peptides. Human osteoblasts known to express these integrins were used to determine cell-polymer interactions. The adhesion experiments revealed significantly increased cell numbers and cell spreading on the RGD-modified surfaces mediated by RGD-integrin-interactions.
机译:控制生物材料表面与附着细胞之间相互作用的一种有前途的策略涉及将粘附肽共价接枝到聚合物上,在该聚合物上基本上抑制了介导非特异性细胞粘附的蛋白质吸附。这项研究表明RGD肽共价锚定到基于单胺聚(乙二醇)-嵌段-聚(D,L-乳酸)(H(2)N-PEG-PLA)的反应性二嵌段共聚物的表面修饰概念。胺反应性(ST-NH-PEG(2)PLA(20))和硫醇反应性衍生物(MP-NH-PEG(2)PLA(40))的膜都被环状alphavbeta3 / alphavbeta5整联蛋白亚型修饰通过将膜与肽的缓冲溶液一起温育即可轻松获得特定RGD肽。已知表达这些整联蛋白的人类成骨细胞被用于确定细胞-聚合物相互作用。粘附实验显示,在RGD-整联蛋白相互作用介导的RGD修饰的表面上,细胞数量显着增加,并且细胞扩散。

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