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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Dye-Combination Micelles for Two-Photon Phototherapy.

Dong Joon Lee1, Vinayak Juvekar1, Yu Cao2

  • 1Department of Chemistry and Department of Energy Systems Research, Ajou University, Suwon, South Korea.

Advanced Healthcare Materials
|January 25, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new photosensitizer for two-photon excitation (TPE) phototherapy. This modular approach enhances antitumor activity and enables targeted cancer cell destruction with minimal invasiveness.

Keywords:
cellular‐organelles targetingcolon tumordye‐combination micelleself‐assembled nanoparticlestwo‐photon phototherapy

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Area of Science:

  • Photodynamic Therapy
  • Nanomedicine
  • Organic Chemistry

Background:

  • Two-photon excitation (TPE) phototherapy offers deep-tissue penetration and high spatial resolution.
  • Developing effective photosensitizers (PSs) for TPE remains a key challenge, especially for targeting specific cellular components and improving efficacy in hypoxic tumor environments.

Purpose of the Study:

  • To create a modular and scalable method for converting TPE imaging dyes into potent type-I photosensitizers.
  • To enhance antitumor efficacy through subcellular targeting and multi-organelle disruption.
  • To develop tumor-selective nanoparticles for targeted photodynamic therapy (PDT).

Main Methods:

  • Chemically modified a TPE imaging dye into a selenium-bridged type-I photosensitizer.
  • Conjugated organelle-specific functional groups for subcellular targeting.
  • Developed dye-combination micelles (DCMs) for self-assembly of targeted PSs into nanoparticles.
  • Surface-modified nanoparticles with RGD peptides for tumor-specific uptake.

Main Results:

  • The novel selenium-bridged dye exhibited strong two-photon absorption and efficient reactive oxygen species (ROS) generation.
  • Subcellularly targeted derivatives demonstrated localized ROS production and improved PDT efficacy.
  • DCM nanoparticles co-assembled membrane- and mitochondria-targeted PSs, enhancing phototoxicity.
  • RGD-modified DCM nanoparticles showed selective uptake via αvβ3 integrins, leading to cancer-specific phototoxicity.
  • The platform demonstrated spatially restricted, two-photon-triggered therapeutic effects in human colon tumor tissue.

Conclusions:

  • A modular strategy effectively transforms TPE dyes into potent type-I photosensitizers.
  • Subcellular targeting and multi-dye nanoparticle assembly enhance PDT efficacy.
  • RGD-functionalized nanoparticles provide tumor selectivity, suggesting significant potential for clinical translation in phototherapy.