Department of Chemistry
Hollow superparamagnetic iron oxide nanoshells as a hydrophobic anticancer drug carrier: Intracelluar pH-dependent drug release and enhanced cytotoxicity
With curcumin and doxorubicin (DOX) base as model drugs, intracellular delivery of hydrophobic anticancer drugs by hollow structured superparamagnetic iron oxide (SPIO) nanoshells (hydrodynamic diameter: 191.9 ± 2.6 nm) was studied in glioblastoma U-87 MG cells. SPIO nanoshell-based encapsulation provided a stable aqueous dispersion of the curcumin. After the SPIO nanoshells were internalized by U-87 MG cells, they localized at the acidic compartments of endosomes and lysosomes. In endosome/lysosome-mimicking buffers with a pH of 4.5-5.5, pH-dependent drug release was observed from curcumin or DOX loaded SPIO nanoshells (curcumin/SPIO or DOX/SPIO). Compared with the free drug, the intracellular curcumin content delivered via curcumin/SPIO was 30 fold higher. Increased intracellular drug content for DOX base delivered via DOX/SPIO was also confirmed, along with a fast intracellular DOX release that was attributed to its protonation in the acidic environment. DOX/SPIO enhanced caspase-3 activity by twofold compared with free DOX base. The concentration that induced 50% cytotoxic effect (CC
Source Publication Title
Royal Society of Chemistry
Link to Publisher's Edition
Zhu, Xiao-Ming, Jing Yuan, Ken Cham-Fai Leung, Siu-Fung Lee, Kathy W. Y. Sham, Christopher H. K. Cheng, Doris W. T. Au, Gao-Jun Teng, Anil T. Ahuja, and Yi-Xiang J. Wang. "Hollow superparamagnetic iron oxide nanoshells as a hydrophobic anticancer drug carrier: Intracelluar pH-dependent drug release and enhanced cytotoxicity." Nanoscale 4.18 (2012): 5744-5754.