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Supramolecular Radiosensitizer Based on Hypoxia-Responsive Macrocycle.

Xiaoxue Hou1, Yu-Xuan Chang2, Yu-Xin Yue2

  • 1CAMS Key Laboratory of Radiopharmacokinetics for Innovative Drugs, Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 7, 2022
PubMed
Summary

This study introduces a novel supramolecular radiotherapy strategy using a hypoxia-responsive macrocycle to deliver a radiosensitizer. This approach enhances tumor destruction via radiotherapy with minimal toxicity.

Keywords:
calixarenedrug deliveryradiotherapysupramolecular chemistrytumor hypoxia

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Oncology

Background:

  • Radiotherapy (RT) is a primary cancer treatment, but tumor radioresistance limits its effectiveness.
  • Developing strategies to overcome radioresistance is crucial for improving patient outcomes.
  • Targeted drug delivery systems can enhance RT efficacy and reduce side effects.

Purpose of the Study:

  • To develop an innovative supramolecular radiotherapy strategy.
  • To create a hypoxia-responsive system for targeted radiosensitizer delivery.
  • To enhance tumor destruction and overcome radioresistance in cancer therapy.

Main Methods:

  • A supramolecular prodrug was synthesized by complexing banoxantrone dihydrochloride (AQ4N) with carboxylated azocalix[4]arene (CAC4A).
  • The system utilizes reversible host-guest interactions and hypoxia-responsive azo reduction for targeted release.
  • In vitro and in vivo studies were conducted to evaluate tumor accumulation, cellular internalization, and therapeutic efficacy.

Main Results:

  • The supramolecular prodrug CAC4A•AQ4N demonstrated high tumor accumulation and efficient cellular uptake in hypoxic environments.
  • This strategy significantly amplified radiation-mediated tumor destruction.
  • An exceptional sensitizer enhancement ratio (SER) of 2.349 was achieved, surpassing existing noncovalent methods.

Conclusions:

  • The developed supramolecular radiotherapy strategy effectively overcomes tumor radioresistance.
  • This hypoxia-responsive system offers a promising platform for enhancing cancer treatment outcomes.
  • The approach holds significant potential for clinical translation in radiotherapy.