Comparison of MRI properties between derivatized DTPA and DOTA gadolinium-dendrimer conjugates.

Comparison of MRI properties between derivatized DTPA and DOTA gadolinium-dendrimer conjugates.
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DOI:
10.1016/j.bmc.2010.06.086
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发表时间:
2010-08-15
影响因子:
3.5
通讯作者:
Brechbiel, M. W.
Brechbiel, M. W.
中科院分区:
医学3区
文献类型:
--
作者:
Nwe, K.;Bernardo, M.;Regino, C. A. S.;Williams, M.;Brechbiel, M. W.

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在本报告中,我们直接比较了衍生的无环二乙烯三胺 - N,N’,N’,N’’,N’’ - 五乙酸(1B4M - DTPA)和大环1,4,7,10 - 四氮杂环十二烷 - N,N’,N’’,N’’’ - 四乙酸(C - DOTA)的钆 - 树枝状大分子偶联物的体内和体外磁共振成像(MRI)特性。在与第4代聚酰胺 - 胺树枝状大分子(G4D)偶联之前,金属 - 配体螯合物在酒精中预先形成,并且基于树枝状大分子的试剂通过葡聚糖凝胶®G - 25柱纯化。分析和尺寸排阻高效液相色谱(SE - HPLC)数据表明螯合物与树枝状大分子的比例分别为30∶1和28∶1。在pH值为7.4、22°C和3T条件下测量的摩尔弛豫率具有可比性(29.5对26.9 mM⁻¹s⁻¹),并且根据所获得的图像,两种偶联物作为MRI造影剂具有同等的可行性。然而,大环试剂在体内表现出更快的清除速率(半衰期t₁/₂ = 16对29分钟)。我们的结论是,基于大环的试剂由于这些原因以及与钆(III) - DOTA配合物稳定性相关的动力学惰性,更适合用于体内。
In this report we directly compare the in vivo and in vitro MRI properties of gadolinium-dendrimer conjugates of derivatized acyclic diethylenetriamine-N,N’,N’,N’’, N’’-pentaacetic acid (1B4M-DTPA) and macrocyclic 1,4,7,10-tetraazacyclododecane-N,N’,N’’,N’’’-tetraacetic acid (C-DOTA). The metal-ligand chelates were pre-formed in alcohol prior to conjugation to the generation 4 PAMAM dendrimer (G4D), and the dendrimer-based agents were purified by Sephadex® G-25 column. The analysis and SE-HPLC data indicated chelate to dendrimer ratios of 30:1 and 28:1 respectively. Molar relaxivity measured at pH 7.4, 22°C, and 3T are comparable (29.5 vs. 26.9 mM−1s−1), and both conjugates are equally viable as MRI contrast agents based on the images obtained. The macrocyclic agent however exhibits a faster rate of clearance in vivo (t1/2 = 16 vs. 29 min.). Our conclusion is that the macrocyclic-based agent is the more suitable agent for in vivo use for these reasons combined with kinetic inertness associated with the Gd(III) DOTA complex stability properties.
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