Magneto-plasmonic Janus vesicles (JVs) integrated with gold nanoparticles (AuNPs) and magnetic NPs (MNPs) were prepared asymmetrically in the membrane for in vivo cancer imaging. The hybrid JVs were produced by coassembling a mixture of hydrophobic MNPs, free amphiphilic block copolymers (BCPs), and AuNPs tethered with amphiphilic BCPs. Depending on the size and content of NPs, the JVs acquired spherical or hemispherical shapes. Among them, hemispherical JVs containing 50 nm AuNPs and 15 nm MNPs showed a strong absorption in the near-infrared (NIR) window and enhanced the transverse relaxation (T2) contrast effect, as a result of the ordering and dense packing of AuNPs and MNPs in the membrane. The magneto-plasmonic JVs were used as drug delivery vehicles, from which the release of a payload can be triggered by NIR light and the release rate can be modulated by a magnetic field. Moreover, the JVs were applied as imaging agents for in vivo bimodal photoacoustic (PA) and magnetic resonance (MR) imaging of tumors by intravenous injection. With an external magnetic field, the accumulation of the JVs in tumors was significantly increased, leading to a signal enhancement of approximately 2–3 times in the PA and MR imaging, compared with control groups without a magnetic field.
|Original language||English (US)|
|Number of pages||4|
|Journal||Angewandte Chemie International Edition|
|State||Published - Nov 10 2016|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): CRG-2015
Acknowledgements: Z.N. gratefully acknowledges the financial support of the National Science Foundation (grants: DMR-1255377, CHE-1505839) and 3M Non-tenured Faculty Award. N.M.K. and Z.N. further acknowledge support provided by a King Abdullah University of Science and Technology CRG-2015 grant. The work was also supported by the Intramural Research Program of the National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health. P.H. acknowledges financial support from National Science Foundation of China (81401465, 51573096). We acknowledge Maryland NanoCenter and its NispLab. NispLab is supported, in part, by the NSF in partnership with MRSEC Shared Experimental Facilities.