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.
中科院分区:
文献类型:
--
作者:
Nwe, K.;Bernardo, M.;Regino, C. A. S.;Williams, M.;Brechbiel, M. W.
关键词:
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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通讯作者:
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