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Biomimetically constructing a hypoxia-activated programmable phototheranostics at the molecular level.

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  • 1Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University Beijing 100871 P. R. China zhangjunlong@pku.edu.cn.

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Summary

This study developed a molecular strategy to combat tumor hypoxia and enhance photodynamic therapy (PDT). The approach uses a catalyst to generate oxygen, improving PDT efficacy and reducing tumor growth, as monitored by MRI.

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Area of Science:

  • Biomedical Engineering
  • Cancer Therapeutics
  • Molecular Oncology

Background:

  • Tumor hypoxia is a key driver of cancer progression, metastasis, and resistance to therapies like photodynamic therapy (PDT).
  • Hypoxia limits the effectiveness of oxygen-dependent treatments by creating an oxygen-depleted microenvironment.
  • Targeting the interplay between hypoxia, angiogenesis, and therapeutic outcomes is crucial for improving cancer treatment.

Purpose of the Study:

  • To develop a programmable molecular strategy to modulate tumor hypoxia, angiogenesis, and PDT outcomes.
  • To create a synergistic system combining a hydrogen peroxide (H2O2) scavenger, oxygen (O2) generator, and photosensitizer.
  • To enhance the efficacy of PDT in hypoxic tumor microenvironments.

Main Methods:

  • A modular system was designed, combining a catalase biomimetic (tri-manganese cryptand) with a photosensitizer (Ce6).
  • This system initiates a cascade reaction converting H2O2 to O2 under hypoxic conditions, enhancing photosensitization and photooxidation.
  • Vascular endothelial growth factor (VEGF) expression and blood vessel growth were assessed in chick chorioallantois membrane (CAM) models.

Main Results:

  • The H2O2-scavenging and O2-generating system successfully enhanced photosensitization and photooxidation under hypoxia.
  • A significant decrease in VEGF expression and reduced unwanted blood vessel growth were observed.
  • Tumor-bearing models demonstrated enhanced PDT efficacy, prolonged survival, and improved immunity, with outcomes monitored by MRI.

Conclusions:

  • The developed molecular strategy effectively addresses tumor hypoxia to improve PDT outcomes.
  • The synergistic combination of O2 generation and photosensitization offers a promising approach for cancer therapy.
  • This programmable system shows potential for enhancing cancer treatment efficacy and monitoring therapeutic responses.