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• W2002150080 abstract "The design, synthesis, characterization, and preliminary biological assessment of three dendrimers are reported. All three dendrimers, 1−3, present twelve paclitaxel groups linked by acylation of the 2′-hydroxyl group. The linker for dendrimers 2 and 3 also includes a disulfide. Installation of the paclitaxel group relies on reacting twelve primary amines of a second generation triazine dendrimer, a scaffold available on kilogram scale, with a dichlorotriazine bearing the drug. This dichlorotriazine is available in four steps by (i) reacting paclitaxel with glutaric anhydride, (ii) activating with N-hydroxysuccinimide (NHS), (iii) treating the resulting ester with either 1,3-diaminopropane (for 1) or cystamine (for 2 and 3), and (iv), finally, reacting with cyanuric chloride. After reaction with the dendrimer, the resulting monochlorotriazine groups are reacted with 4-aminomethylpiperidine (AMP) and then a poly(ethylene glycol) (PEG) group of molecular weight 2 kDa. Two different PEG-NHS esters are employed that differ in lability. For 1 and 2, the PEG incorporates an ester-linked succinic acid group. For 3, the PEG incorporates an ether-linked acetic acid group. Both mass spectrometry and 1H NMR spectroscopy prove valuable for determining the final ratios of dendrimer:paclitaxel:AMP:PEG. These values are typically 1:12:12:9. Cytotoxicity of these constructs using an MTT-based assay and PC-3 cells reveals IC50 values in the low nanomolar range with dithiothreitol and glutathione enhancing the toxicity of the disulfide-containing constructs 2 and 3. Preliminary toxicology assessment of 1 suggests that it is well tolerated in vivo with preferential renal clearance. The elimination half-lives of all of the dendrimers appear shorter than predicted from the previous results. Tumor localization is observed for all the three dendrimers." @default.
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• W2002150080 date "2009-10-30" @default.
• W2002150080 modified "2023-10-17" @default.
• W2002150080 title "Design, Synthesis, Characterization, and Biological Evaluation of Triazine Dendrimers Bearing Paclitaxel Using Ester and Ester/Disulfide Linkages" @default.
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• W2002150080 doi "https://doi.org/10.1021/bc900324z" @default.
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