A smart T(1)-weighted MRI contrast agent for uranyl cations based on a DNAzyme-gadolinium conjugate.

A smart T(1)-weighted MRI contrast agent for uranyl cations based on a DNAzyme-gadolinium conjugate.
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DOI:
10.1039/c3an01182h
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发表时间:
2013-11-07
期刊:
The Analyst
影响因子:
--
通讯作者:
Lu Y
Lu Y
中科院分区:
其他
文献类型:
--
作者:
Xu W;Xing H;Lu Y

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合理设计对金属离子具有高特异性的智能MRI造影剂仍然是一个挑战。在这里,我们报告了一个通用的策略,用于检测金属离子的基础上共轭的DNAzyme与钆配合物的智能MRI造影剂的设计。将对UO_(22+)具有高选择性的39E DNA酶与Gd(III)-DOTA和链霉亲和素偶联。UO 22+与其39E DNA酶的结合导致Gd(III)-DOTA从大量链霉亲和素上解离,导致T1相关时间缩短,MRI信号改变。
Rational design of smart MRI contrast agents with high specificity for metal ions remains to be a challenge. Here, we report a general strategy for the design of smart MRI contrast agents for detecting metal ions based on conjugation of a DNAzyme with a gadolinium complex. The 39E DNAzyme, which has high selectivity for UO22+, was conjugated to Gd(III)-DOTA and streptavidin. The binding of UO22+ to its 39E DNAzyme resulted in the dissociation of Gd(III)-DOTA from the massive streptavidin, leading to a decrease in T1 correlation time, and a change in MRI signal.
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