A Polyoxyethylene-Substituted Bimetallic Europium Helicate for Luminescent Staining of Living Cells
作者:Anne-Sophie Chauvin、Steve Comby、Bo Song、Caroline D. B. Vandevyver、Frédéric Thomas、Jean-Claude G. Bünzli
DOI:10.1002/chem.200700883
日期:2007.11.26
[Eu2(LC3)3] is observed on the viability of several cancerous cell lines (MCF-7, HeLa, Jurkat, and 5D10). The cell imaging properties of the EuIII helicate are demonstrated for the HeLa cell line by luminescence microscopy. Bright EuIII emission is seen for helicate concentration>50 microM and after 20-30 min loading time. The helicate stains the cytoplasm and the permeation mechanism is likely to be
设计了同位异位配体H2LC3以形成整体组成为[Ln2(LC3)3]的中性三链双金属螺旋。聚氧乙烯片段的接枝确保水溶性并且还有利于细胞渗透,同时易于进一步衍生。配体pKa值已通过分光光度滴定法确定,范围为3.5(前两个值之和)至10.3。在生理pH值下(logbeta23在22-23范围内),螺旋体的热力学稳定性很大。配体三重态具有足够的能量(在约20,800 cm(-1)处有0声子跃迁),用于激发EuIII的发光(Q = 11%)。EuIII发射光谱的分析指向金属环境的总体伪D3对称性。没有观察到[Eu2(LC3)3]对几种癌细胞系(MCF-7,HeLa,Jurkat和5D10)的存活率没有显着影响。通过发光显微镜对HeLa细胞系证明了EuIII螺旋体的细胞成像特性。螺旋浓度> 50 microM且加载时间为20-30分钟后,可以看到明亮的EuIII发射。螺旋线对细胞质染色,渗透机制可能是内吞作用。