Multivalent, high-relaxivity MRI contrast agents using rigid cysteine-reactive gadolinium complexes.

Multivalent, high-relaxivity MRI contrast agents using rigid cysteine-reactive gadolinium complexes.
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DOI:
10.1021/ja204516p
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发表时间:
2011-09-21
影响因子:
15
通讯作者:
Francis, Matthew B.
Francis, Matthew B.
中科院分区:
化学1区
文献类型:
--
作者:
Garimella, Praveena D.;Datta, Ankona;Romanini, Dante W.;Raymond, Kenneth N.;Francis, Matthew B.

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提供非常高弛豫率值的MRI造影剂可以通过将多个钆(III)络合物附着到无基因组的病毒衣壳的内表面来获得。在先前的研究中,预测对比度增强取决于将MRI试剂连接到蛋白质表面的连接体的刚性。为了检验这一假设,制备了一组新的基于Gd-羟基吡啶酮的MRI试剂,并通过柔性和刚性接头连接到遗传引入的半胱氨酸残基上。对于通过刚性连接体连接的MRI试剂,观察到更大的对比度增强,验证了设计概念并概述了纳米级MRI造影剂未来改进的路径。
MRI contrast agents providing very high relaxivity values can be obtained through the attachment of multiple gadolinium(III) complexes to the interior surfaces of genome-free viral capsids. In previous studies, the contrast enhancement was predicted to depend on the rigidity of the linker attaching the MRI agents to the protein surface. To test this hypothesis, a new set of Gd-hydroxypyridonate based MRI agents was prepared and attached to genetically introduced cysteine residues through flexible and rigid linkers. Greater contrast enhancements were seen for MRI agents that were attached via rigid linkers, validating the design concept and outlining a path for future improvements of nanoscale MRI contrast agents.
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