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Ruthenium-arene assemblies loaded with porphyrin photosensitizers show promise for colorectal cancer photodynamic therapy (PDT). These novel agents enhance cancer cell uptake and phototoxicity, offering a potential new treatment avenue.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Oncology

Background:

  • Colorectal cancer (CRC) incidence is rising, with existing treatments facing challenges like side effects and resistance.
  • Photodynamic therapy (PDT) is a promising cancer treatment, but current photosensitizers (PS) suffer from poor solubility and tumor selectivity.
  • Developing improved PS is critical for enhancing PDT efficacy in cancer treatment.

Purpose of the Study:

  • To investigate ruthenium-arene assemblies as carriers for porphyrin photosensitizers for colorectal cancer PDT.
  • To evaluate the cellular uptake and photocytotoxicity of these novel PS delivery systems.
  • To assess the mechanism of cell death induced by the targeted PDT approach.

Main Methods:

  • Synthesis and characterization of two distinct arene-ruthenium assemblies encapsulating porphyrin PS.
  • Assessment of cellular internalization in HCT116 and HT-29 human CRC cell lines using fluorescence microscopy.
  • Evaluation of photocytotoxicity upon photoactivation, including analysis of apoptosis and cell cycle progression.

Main Results:

  • Confirmed cellular internalization of the porphyrin-loaded arene-Ru assemblies in CRC cell lines.
  • Demonstrated significant photocytotoxicity in both HCT116 and HT-29 cells post-photoactivation.
  • Observed induction of apoptosis via caspase activation and disruption of cell cycle progression.

Conclusions:

  • Arene-ruthenium assemblies effectively deliver porphyrin PS into colorectal cancer cells.
  • These systems exhibit potent photocytotoxicity, making them promising candidates for colorectal cancer PDT.
  • The targeted approach induces cancer cell death through apoptosis and cell cycle arrest.