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Protoporphyrin IX-Derived Ruthenium(II) Complexes for Photodynamic Therapy in Gastric Cancer Cells.

Andrés Restrepo-Acevedo1, María Isabel Murillo1, Christophe Orvain2

  • 1Universidad Nacional Autonoma de México, Instituto de Química UNAM, Circuito Exterior s/n Ciudad Universitaria, 04510 Ciudad de México, Mexico.

Inorganic Chemistry
|May 2, 2025
PubMed
Summary
This summary is machine-generated.

Ruthenium(II) complexes derived from porphyrin and chlorin were developed as photosensitizers for photodynamic therapy (PDT). These complexes show low toxicity in the dark but high cytotoxicity upon light activation, inducing cancer cell death via apoptosis.

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Area of Science:

  • Photodynamic Therapy
  • Cancer Treatment
  • Medicinal Chemistry

Background:

  • Photodynamic therapy (PDT) offers a promising alternative to chemotherapy for cancer treatment.
  • Photosensitizers (PS) are nontoxic prodrugs activated by light to generate cytotoxic reactive oxygen species (ROS) within tumors.
  • Metal-containing conjugated compounds, like porphyrins and chlorins, enhance ROS generation for improved PDT efficacy.

Purpose of the Study:

  • To design and synthesize novel tetrapyrrole-ruthenium(II) complexes as photosensitizers for PDT.
  • To evaluate the phototoxicity and mechanisms of action of these novel ruthenium derivatives.
  • To investigate their efficacy against human gastric cancer cells.

Main Methods:

  • Synthesis of tetrapyrrole-ruthenium(II) complexes from protoporphyrin IX and verteporfin.
  • Assessment of cytotoxicity on human gastric cancer cells under dark and light irradiation conditions.
  • Detection of reactive oxygen species (ROS), including singlet oxygen and superoxide radicals.
  • Analysis of cell death pathways, including caspase-3 mediated apoptosis and endoplasmic reticulum stress (CHOP).

Main Results:

  • The synthesized ruthenium complexes exhibited negligible dark toxicity but potent photocytotoxicity against gastric cancer cells.
  • Ruthenium incorporation enabled dual ROS generation (singlet oxygen and superoxide radicals) and activity under hypoxia.
  • Cell death was induced via caspase-3 mediated apoptosis and endoplasmic reticulum stress-associated CHOP pathway.

Conclusions:

  • Tetrapyrrole-ruthenium(II) complexes are effective photosensitizers for PDT, demonstrating potent anti-cancer activity.
  • The dual ROS generation and hypoxic activity highlight their potential for enhanced therapeutic outcomes.
  • These complexes induce cancer cell death through well-defined apoptotic and stress-related pathways.