Journal
BIOMATERIALS
Volume 34, Issue 2, Pages 492-500Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2012.09.030
Keywords
Micelles; Drug delivery; Magnetic resonance imaging (MRI); Polymer-metal complex; Cancer diagnosis
Funding
- Japan Society for the Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Ministry of Education, Science, Sports and Culture (MEXT), Japan
- Grants-in-Aid for Scientific Research [23700526, 25670010, 23390009] Funding Source: KAKEN
Ask authors/readers for more resources
Nanodevices for magnetic resonance imaging of cancer were self-assembled to core-shell micellar structures by metal complex formation of K2PtCl6 with diethylenetriaminepentaacetic acid gadolinium (III) dihydrogen (Gd-DTPA), a T-1-contrast agent, and poly(ethylene glycol)-b-poly{N-[N'-(2-aminoethyl)-2-aminoethyl]aspartamide} (PEG-6-PAsp(DET)) copolymer in aqueous solution. Gd-DTPA-loaded polymeric micelles (Gd-DTPA/m) showed a hydrodynamic diameter of 45 nm and a core size of 22 nm. Confining Gd-DTPA inside the core of the micelles increased the relaxivity of Gd-DTPA more than 13 times (48 mM(-1) s(-1)). In physiological conditions Gd-DTPA/m sustainedly released Gd-DTPA, while the Pt(IV) complexes remain bound to the polymer. Gd-DTPA/m extended the circulation time in plasma and augmented the tumor accumulation of Gd-DTPA leading to successful contrast enhancement of solid tumors. mu-Synchrotron radiation-X-ray fluorescence results confirmed that Gd-DTPA was delivered to the tumor site by the micelles. Our study provides a facile strategy for incorporating contrast agents, dyes and bioactive molecules into nanodevices for developing safe and efficient drug carriers for clinical application. (C) 2012 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available