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Acid-responsive singlet oxygen nanodepots.

Zengwei Ran1, Maolin Wang1, Zhu Yuan2

  • 1Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research, Ministry of Education, Institute of Interdisciplinary Studies, College of Chemistry and Chemical Engineering, Hunan Normal University Changsha Hunan 410081 China ghliu@hunnu.edu.cn yangrh@pku.edu.cn.

Chemical Science
|December 13, 2024
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Summary
This summary is machine-generated.

This study introduces an acid-responsive singlet oxygen nanodepot (aSOND) for controlled cancer therapy. The aSOND releases singlet oxygen specifically in acidic tumor environments, enhancing treatment precision.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Cancer Therapy

Background:

  • Traditional photodynamic therapy (PDT) faces limitations due to oxygen dependence and poor light penetration in solid tumors.
  • Lack of control over singlet oxygen release hinders precise application in cancer treatment.
  • Existing methods struggle with oxygen supply and light penetration challenges in solid tumors.

Purpose of the Study:

  • To develop an acid-responsive singlet oxygen nanodepot (aSOND) for controlled and targeted cancer therapy.
  • To overcome the limitations of traditional PDT by enabling precise singlet oxygen release.
  • To create a nanocarrier for "OFF-ON" singlet oxygen therapy independent of external stimuli.

Main Methods:

  • Synthesized an acid-responsive singlet oxygen nanodepot (aSOND) using a diblock copolymer (PEG and pH-responsive block).
  • Investigated singlet oxygen release profiles in neutral/alkaline versus acidic environments.
  • Evaluated the aSOND system for controlled release of reactive oxygen species (ROS) in tumor-mimicking conditions.

Main Results:

  • The aSOND demonstrated slow singlet oxygen release in neutral/alkaline conditions, ensuring stability.
  • Rapid singlet oxygen release was triggered in acidic environments (tumor microenvironment, lysosomes) due to polymer hydration.
  • The system achieved "OFF-ON" singlet oxygen release, showing high spatiotemporal selectivity.

Conclusions:

  • The aSOND system offers a promising approach for targeted cancer therapy by enabling controlled singlet oxygen release.
  • This nanodepot overcomes oxygen supply and light penetration limitations of traditional PDT.
  • The developed aSOND provides a novel strategy for precise, stimulus-responsive cancer treatment.