Multifunctional Mn-Cu Bimetallic DNAsome for Photothermal-Assisted Chemodynamic Cancer Therapy

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Therapy

Background:

• Chemodynamic therapy (CDT) efficacy is limited by slow Fenton reaction kinetics in the tumor microenvironment (TME).
• Developing strategies to accelerate Fenton reactions is crucial for enhancing CDT effectiveness.

Purpose of the Study:

• To create a DNA-based agent (DNA1some/PDMn/DNA2) with dual Fenton reaction centers and a photothermal agent.
• To achieve targeted and enhanced chemodynamic cancer therapy through improved reaction kinetics and synergistic effects.

Main Methods:

• A supramolecular approach was used to construct the DNA-based nanoformulation.
• The nanoformulation facilitates targeted cellular uptake via receptor-mediated endocytosis and lysosomal disassembly.
• Dual Fenton reaction centers (Cu+, Mn2+) were generated intracellularly, producing hydroxyl radicals (•OH).
• Polydopamine within the nanoformulation enabled photothermal therapy (PTT) upon 808 nm laser irradiation.

Main Results:

• The nanoformulation successfully delivered its components, generating reactive oxygen species (ROS) via Fenton reactions.
• Photothermal irradiation enhanced both Fenton reaction efficiency and induced cellular apoptosis.
• The combination of PTT and CDT resulted in significantly improved therapeutic outcomes.

Conclusions:

• The developed DNA-based nanoagent effectively overcomes the limitations of traditional CDT by enhancing Fenton reaction kinetics.
• The synergistic combination of PTT and CDT offers a promising strategy for targeted and enhanced cancer therapy.