Journal
ADVANCED SCIENCE
Volume 7, Issue 7, Pages -Publisher
WILEY
DOI: 10.1002/advs.201903512
Keywords
chemodynamic therapy; FeS@BSA nanoclusters; reactive oxygen species (ROS)-based therapy; synergetic therapy; synergetic tumor treatment; tumor theranostics
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Funding
- National Natural Science Foundation of China [51672247]
- 111 Program - Education Ministry of China
- Sate Bureau of Foreign Experts Affairs [B16043]
- Fundamental Research Funds for the Central Universities [2019XZZX005-3-01]
- Provincial Key Research Program of Zhejiang Province [2020C04005]
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Therapeutic systems to induce reactive oxygen species (ROS) have received tremendous success in the research of tumor theranostics, but suffered daunting challenges in limited efficacy originating from low presence of reactants and reaction kinetics within cancer cells. Here, ferrous sulfide-embedded bovine serum albumin (FeS@BSA) nanoclusters, in an amorphous nature, are designed and synthesized via a self-assembly approach. In acidic conditions, the nanoclusters degrade and simultaneously release H2S gas and Fe2+ ions. The in vitro study using Huh7 cancer cells reveals that Fe2+ released from FeS@BSA nanoclusters induces the toxic hydroxyl radical (center dot OH) effectively via the Fenton reaction. More interestingly, H2S gas released intracellularly presents the specific suppression effect to catalase activity of cancer cells, resulting in the promoted presence of H2O2 that facilitates the Fenton reaction of Fe2+ and consequently promotes ROS induction within the cells remarkably. After intravenous administration, the nanoclusters accumulate in the tumors of mice via the enhanced permeability and retention effect and present strong magnetic resonance imaging (MRI) signals. The findings confirm this therapeutic system can enable superior anti-tumor performance with MRI guidance and negligible side effects. This study, therefore, offers an alternative gas-amplified ROS-based therapeutic platform for synergetic tumor treatment.
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