Analysis of Lanthanide Complex Dendrimer Conjugates for Bimodal NIR and MRI Imaging.

Analysis of Lanthanide Complex Dendrimer Conjugates for Bimodal NIR and MRI Imaging.
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DOI:
10.1021/ma302206g
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发表时间:
2012-11-27
期刊:
影响因子:
5.5
通讯作者:
Raymond KN
Raymond KN
中科院分区:
化学1区
文献类型:
--
作者:
Andolina CM;Klemm PJ;Floyd WC 3rd;Fréchet JM;Raymond KN

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Advances in clinical diagnostic instrumentation have enabled some imaging modalities to be run concurrently. For diagnostic purposes, multimodal imaging can allow for rapid location and accurate identification of a patient’s illness. The paramagnetic and near Infra-red (NIR) properties of Dy(III) and Yb(III) are interesting candidates for the development of bimodal NIR and magnetic resonance imaging (MRI) contrast agents. To enhance their intrinsic bimodal properties, these lanthanides were chelated using the hexadentate-all-oxygen-donor-ligand TREN-bis-(1-Me)-3,2-HOPO-TAM-NX (NX, where X = 1, 2 or 3) and subsequently conjugated to the esteramide dendrimer (EA), to improve bioavailability, solubility, and relaxivity. Of these new complexes synthesized and evaluated, DyN1-EA had the largest ionic T1 relaxivity, 7.60 mM−1 s−1, while YbN3-EA had the largest ionic T2 relaxivity with a NIR quantum yield of 0.17 % when evaluated in mouse serum. This is the first Yb(III) bimodal NIR/T2 MRI contrast agent of its kind evaluated.
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