Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 18, Issue 16, Pages 5925-5931Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2010.06.086
Keywords
2-(p-Isothiocyanato benzyl)-6-methyl-diethylenetriaminepentaacetic acid (1B4M-DTPA); Polyamidoamine (PAMAM) generation; 4 dendrimer (G4D); 2-(4-Isothiocyanatobenzyl)-1,4,7,10-tetraazacyclododecane-N,N '; N '',N '''-tetraacetic acid gadolinium complex; (p-SCN-C-DOTA[Gd])
Funding
- National Institute of Health, National Cancer Institute, Center for Cancer Research
- United States Department of Health and Human Services
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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 (R) 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 degrees C, and 3T are comparable (29.5 vs 26.9 mM (1) s (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 (t(1/2) = 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. Published by Elsevier Ltd.
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