Exploration of metallized phthalocyanines as potential alternative photosensitizers in photodynamic therapy
Archives of Advances in Biosciences,
Vol. 16 No. 1 (2025),
2 March 2025
,
Page 1-16
https://doi.org/10.22037/aab.v16i1.50350
Abstract
Introduction: Photodynamic therapy (PDT) relies on the interaction of light, photosensitizers, and molecular oxygen to generate reactive oxygen species capable of inducing cytotoxic effects, particularly in cancer cells. Metallophthalocyanines have emerged as promising photosensitizers due to their strong absorption in the red region, chemical stability, and tunable photophysical properties. Understanding their coordination chemistry and interactions with biological systems is essential for optimizing their therapeutic performance. This study evaluates the behavior of various metal-bound phthalocyanines and their capacity to induce DNA photo-damage, which is central to their effectiveness in PDT.
Materials and Methods: Metallophthalocyanines containing Zn, Cu, Ni, Co, Fe, and Mn were synthesized or obtained in purified form. Their photosensitizing activity was assessed using pBR322 plasmid DNA exposed to controlled light irradiation. DNA photo-damage was analyzed using standard gel electrophoresis techniques. The photochemical reactivity of each metal-phthalocyanine complex was evaluated to determine its DNA-interaction pattern and ROS-generation potential.
Results: All tested metallophthalocyanines showed varying capacities to photosensitize and damage plasmid DNA under light exposure. Complexes containing Zn and Cu exhibited the highest DNA photo-cleavage efficiency, correlating with their favorable photophysical properties. Differences in coordination chemistry among the metal centers notably influenced ROS generation and the extent of DNA strand breaks. The results highlight structural-dependent variations in photoactivity, revealing candidates with strong potential for PDT applications.
Conclusion: Metallophthalocyanines, particularly those containing Zn and Cu, demonstrate significant potential as efficient photosensitizers for photodynamic therapy. Their ability to generate reactive oxygen species and induce DNA damage suggests promising applications in targeted cancer treatment. Further investigation into their in vitro and in vivo bioactivity will support the development of more effective PDT agents.
- Photodynamic therapy
- Photosensitizer
- Phthalocyanines
- Reactive oxygen species
- Multi epitope Peptide Vaccine
- NSCLC
- Immunotherapy
How to Cite
References
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