Journal
BIOMATERIALS
Volume 114, Issue -, Pages 23-33Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2016.10.027
Keywords
MRI; Superparamagnetic iron oxide nanoparticles; Polymersome; Polymer vesicle; Antitumor drug delivery; Self-assembly
Funding
- NSFC [21374080, 21674081, 21611130175, 81502451]
- Shanghai 1000 Plan [SH01068]
- Shanghai International Scientific Collaboration Fund [15230724500]
- Fundamental Research Funds for the Central Universities [0500219211, 1500219107]
- Beijing National Laboratory for Molecular Sciences [BNLMS20140127]
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Improving the relaxivity of magnetic resonance imaging (MRI) contrast agents is an important challenge for cancer theranostics. Herein we report the design, synthesis, characterization, theoretical analysis and in vivo tests of a superparamagnetic polymersome as a new MRI contrast agent with extremely high T-2 relaxivity (611.6 mM(-1)s(-1)). First, a noncytotoxic cancer-targeting polymersome is synthesized based on a biodegradable diblock copolymer, folic acid-poly(L-glutamic acid)-block-poly(epsilon-caprolactone) [FA-PGA-b-PCL]. Then, ultra-small superparamagnetic iron oxide nanoparticles (SPIONs) are in situ generated in the hydrophilic PGA coronas of polymersomes to afford magnetic polymersomes. The in vivo MRI assay revealed prominent negative contrast enhancement of magnetic polymersomes at a very low Fe dose of 0.011 mmol/kg. Moreover, this cancer-targeting magnetic polymersome can effectively encapsulate and deliver anticancer drug to inhibit the tumor growth, demonstrating promising theranostic applications in biomedicine. (C) 2016 Elsevier Ltd. All rights reserved.
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