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Alloxazine derivatives as multifunctional agents for photodynamic therapy, cancer cell imaging, and cell

Rubej R Khan1, Sourav Kanti Seth1, Reshma Mathew1

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Photochemistry and Photobiology
|September 5, 2025
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Summary

Researchers developed new alloxazine-based photosensitizers for image-guided photodynamic therapy. These compounds show strong fluorescence, generate reactive oxygen species, and inhibit cancer cell growth, offering a promising tool for cancer treatment.

Keywords:
TCSPCcancer cell inhibitionfluorescence lifetimesimage‐guided PDTorganic photosensitizerphotodynamic therapysinglet oxygen yieldsynthesistransient absorption spectroscopytriplet state

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Biomedical Engineering
  • Cancer Therapy

Background:

  • Development of biocompatible organic photosensitizers is crucial for advancing image-guided photodynamic therapy.
  • There is a high demand for photosensitizers with strong photodynamic activity, fluorescence for bioimaging, and cancer cell proliferation inhibition.
  • Synthetic accessibility of such agents is also a key consideration.

Purpose of the Study:

  • To synthesize and characterize a novel class of alloxazine-based photosensitizers.
  • To engineer these photosensitizers through sugar conjugation and modification at C7/C8 positions with methoxy groups.
  • To tune their photochemistry and photobiology for enhanced therapeutic and imaging applications.

Main Methods:

  • Synthesis and characterization of alloxazine derivatives (ANOMe, A8OMe, A7OMe).
  • Spectroscopic analysis: steady-state, time-correlated single-photon counting, and nanosecond transient absorption spectroscopy.
  • Computational studies: Density Functional Theory (DFT) and Time-Dependent DFT (TD-DFT) for electronic relaxation mechanisms.
  • In vitro cellular assays to evaluate cellular uptake, reactive oxygen species generation, fluorescence, and antiproliferative effects.

Main Results:

  • The synthesized alloxazine photosensitizers exhibit efficient population of long-lived triplet states and high singlet oxygen quantum yields.
  • These compounds possess fluorescence properties suitable for bioimaging.
  • In vitro studies confirmed cellular uptake, light-activated generation of cytotoxic reactive oxygen species, and significant inhibition of cancer cell proliferation.
  • Computational and experimental data elucidated their electronic relaxation pathways.

Conclusions:

  • Rationally designed alloxazine derivatives are effective multifunctional agents for image-guided photodynamic therapy.
  • Sugar conjugation and methoxy group modifications successfully tuned the photophysical and photobiological properties.
  • These novel photosensitizers demonstrate potential for combined cancer imaging and therapy.