Cao, Yi Liu, Min Zhang, Kunchi Zu, Guangyue Kuang, Ye Tong, Xiaoyan Xiong, Dangsheng Pei, Renjun Poly(glycerol) Used for Constructing Mixed Polymeric Micelles as <i>T</i><sub>1</sub> MRI Contrast Agent for Tumor-Targeted Imaging There was much interest in the development of nanoscale delivery vehicles based on polymeric micelles to realize the diagnostic and therapeutic applications in biomedicine. Here, with the purpose of constructing a micellar magnetic resonance imaging (MRI) contrast agent (CA) with well biocompatibility and targeting specificity, two types of amphiphilic diblock polymers, mPEG–PG­(DOTA­(Gd))-<i>b</i>-PCL and FA-PEG-<i>b</i>-PCL, were synthesized to form mixed micelles by coassembly. The nanostructure of the resulting micellar system consisted of poly­(caprolactone) (PCL) as core and poly­(glycerol) (PG) and poly­(ethylene glycol) (PEG) as shell, simultaneously modified with DOTA­(Gd) chelates and folic acid (FA), which afforded functions of MRI contrast enhancement and tumor targeting. The mixed micelles in aqueous solution presented a hydrodynamic diameter of about 85 nm. Additionally, this mixed micelles exhibited higher <i>r</i><sub>1</sub> relaxivity (14.01 mM<sup>–1</sup> S<sup>1–</sup>) compared with commercial Magnevist (3.95 mM<sup>–1</sup> S<sup>1–</sup>) and showed negligible cytotoxicity estimated by WST assay. In vitro and in vivo MRI experiments revealed excellent targeting specificity to tumor cells and tissue. Furthermore, considerably enhanced signal intensity and prominent positive contrast effect were achieved at tumor region after tumor-bearing mice were intravenously injected with the mixed micelles. These preliminary results indicated the potential of the mixed micelle as <i>T</i><sub>1</sub> MRI CA for tumor-targeted imaging. signal intensity;PG;vivo MRI experiments;WST assay;amphiphilic diblock polymers;PCL;T 1 MRI CA;micelle;DOTA;MRI contrast enhancement;tumor-targeted imaging;folic acid;Tumor-Targeted Imaging;FA;PEG;Constructing Mixed Polymeric Micelles;hydrodynamic diameter;85 nm;tumor cells;contrast agent;nanoscale delivery vehicles;micellar system;tumor-bearing mice;tumor region;FA-PEG;T 1 MRI Contrast Agent;resonance imaging;contrast effect 2016-11-21
    https://acs.figshare.com/articles/journal_contribution/Poly_glycerol_Used_for_Constructing_Mixed_Polymeric_Micelles_as_i_T_i_sub_1_sub_MRI_Contrast_Agent_for_Tumor-Targeted_Imaging/4282169
10.1021/acs.biomac.6b01437.s001