Augment of Oxidative Damage with Enhanced Photodynamic Process and MTH1 Inhibition for Tumor Therapy

Area of Science:

• Biomedical Engineering
• Nanomedicine
• Cancer Therapy

Background:

• Tumor cells utilize DNA repair mechanisms, like MTH1, to resist oxidative stress, limiting current oxidation therapies.
• Developing strategies to overcome tumor resistance is crucial for enhancing cancer treatment efficacy.

Purpose of the Study:

• To propose an amplified oxidative damage strategy by simultaneously enhancing ROS generation and inhibiting MTH1 activity.
• To develop an intelligent nanoplatform for targeted tumor therapy.

Main Methods:

• Mesoporous silica-coated Prussian blue nanoplatforms (PB@MSN) were synthesized and loaded with MTH1 inhibitor TH287.
• PB@MSN were modified with tetraphenylporphyrin zinc (Zn-Por) to create PMPT nanosystems for photodynamic therapy and imaging.
• The PMPT system utilizes H2O2 decomposition to increase singlet oxygen and releases TH287 to inhibit MTH1.

Main Results:

• The PMPT nanosystems effectively decomposed H2O2, alleviating tumor hypoxia and boosting singlet oxygen generation.
• Controllable release of TH287 inhibited MTH1-mediated DNA repair, leading to aggravated oxidative damage.
• The strategy demonstrated significant cellular toxicity and tumor growth inhibition.

Conclusions:

• The PMPT nanosystem offers a dual-action approach for amplified oxidative damage in tumor therapy.
• This strategy effectively overcomes MTH1-mediated resistance, showing promise for enhanced cancer treatment.
• The developed nanoplatform integrates therapeutic and imaging capabilities for potential clinical translation.