Enhancing Tumor Catalytic Therapy by Co-Catalysis

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Fenton reactions show promise in tumor catalytic therapy but are limited by slow Fe3+ to Fe2+ conversion kinetics.
• Developing efficient nanocatalysts is crucial for enhancing the efficacy of Fenton-based cancer treatments.

Purpose of the Study:

• To introduce a co-catalytic concept using two-dimensional molybdenum disulfide (MoS2) nanosheets with atomically dispersed iron species for tumor catalytic therapy.
• To improve the reaction kinetics of Fenton reactions and enhance anticancer efficacy.

Main Methods:

• Synthesized a two-dimensional MoS2 nanosheet atomically dispersed with single-atom Fe species.
• Investigated the role of sulfur vacancies in promoting electron capture by hydrogen peroxide.
• Evaluated the co-catalytic effect of MoS2 in accelerating Fe3+ to Fe2+ conversion.
• Assessed the catalytic performance and anticancer efficacy in vitro and in vivo.

Main Results:

• The single-atom Fe species served as active sites for Fenton reactions.
• Sulfur vacancies on MoS2 facilitated hydroxyl radical production.
• The MoS2 support acted as a co-catalyst, accelerating Fe3+ to Fe2+ conversion via Mo4+ oxidation.
• The developed nanocatalyst demonstrated enhanced catalytic performance and significant anticancer efficacy.

Conclusions:

• The co-catalytic concept using Fe-decorated MoS2 nanosheets effectively enhances Fenton reactions for tumor catalytic therapy.
• This approach significantly improves anticancer efficacy both in vitro and in vivo.
• The findings highlight the potential of this strategy for developing advanced cancer treatment modalities.