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Chirality-mediated enhancement of nitric oxide release and regulation of endothelial cells behaviors by cystine immobilization on Ti–O films

机译:手性介导的胱氨酸固定在Ti–O膜上的一氧化氮释放增强和内皮细胞行为调控

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Endogenous nitric oxide (NO), generated by endothelial cells (ECs), plays a critical role in the cardiovascular system. However, the effect of biomaterial-induced NO release on ECs is not clear. In this study, cystine with different chirality was immobilized on Ti–O films to catalyze endogenous S-nitrosothiol decomposition to generate NO. Chemiluminescence analysis showed that a stable, sustained release of NO at a speed similar to that in healthy ECs was achieved on both enantiomer immobilized surfaces. However, L-cystine-immobilized surfaces induced higher NO release than D-cystine-immobilized surfaces. Although BSA adsorption was enhanced on L-surfaces, according to QCM analysis, preadsorption of BSA on L-surface still had a significantly higher NO release than that on the D-surface, indicating that the adsorption of BSA on L-surfaces was reversible. Platelet activation on the L-surfaces was obviously inhibited because of induction of more NO release. The growth, migration, and NO secretion behaviors of ECs were promoted by increased NO release on the L-surfaces. These results show that L-cystine-immobilized surfaces are beneficial for the induction of NO release and regulation of the behaviors of ECs, providing a promising method for the endothelialization of vascular biomaterials.
机译:内皮细胞(EC)产生的内源性一氧化氮(NO)在心血管系统中起关键作用。但是,生物材料诱导的NO释放对EC的影响尚不清楚。在这项研究中,将具有不同手性的胱氨酸固定在Ti-O薄膜上,以催化内源性 S -亚硝基硫醇分解生成NO。化学发光分析表明,在两个对映体固定的表面上都以类似于健康EC的速度稳定,持续释放NO。然而,与 D -胱氨酸固定化的表面相比, L -胱氨酸固定化的表面诱导更高的NO释放。虽然QSA分析表明,虽然BSA在 L 表面上的吸附得到增强,但BSA在 L 表面上的预吸附仍比 L上的NO释放量高得多。 D -表面,表明BSA在 L -表面的吸附是可逆的。 L 表面的血小板活化明显受到抑制,这是因为诱导了更多的NO释放。 EC在 L 表面的释放增加,促进了EC的生长,迁移和NO分泌行为。这些结果表明, L -胱氨酸固定的表面有利于诱导NO释放和调节EC的行为,为血管生物材料的内皮化提供了有希望的方法。

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