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Morpholinoethoxy-Substituted Cationic Metal-Free and Metallo Phthalocyanines: In Vitro Photodynamic Therapy
Muge Serhatli1, Seyma Isik1,2, Ayfer Kalkan3
1Climate Change and Life Sciences, Biotechnology Research Group, TUBITAK Marmara Research Center, Kocaeli 41470, Turkey.
ACS Bio & Med Chem Au
|August 27, 2025
Summary
This study synthesized cationic phthalocyanines (Pcs) for photodynamic therapy (PDT). The zinc derivative (HQZnPc) showed high efficacy in killing cancer cells by inducing apoptosis and reactive oxygen species (ROS) production.
Area of Science:
- Materials Science
- Photochemistry
- Cancer Research
Background:
- Phthalocyanines (Pcs) are extensively studied for photodynamic therapy (PDT).
- Cationic Pcs with morpholinoethoxy substituents were synthesized to enhance water solubility and cellular uptake.
- Evaluating the efficacy of novel Pcs against various cancer cell lines is crucial for therapeutic development.
Purpose of the Study:
- To synthesize and characterize morpholinoethoxy-attached cationic tetra-substituted phthalocyanines (Pcs).
- To evaluate the photodynamic therapy (PDT) efficacy of these Pcs against head, neck, and colon cancer cell lines.
- To investigate the mechanisms of cell death and reactive oxygen species (ROS) generation induced by these Pcs.
Main Methods:
- Synthesis and spectroscopic characterization of metal-free (HQH2Pc), zinc (HQZnPc), and indium (HQInPc) phthalocyanines.
- Assessment of PDT efficacy and cytotoxicity against cancer cell lines.
- Quantification of ROS production using dichlorodihydrofluorescein diacetate.
- Analysis of apoptosis and necrosis using fluorescence staining (Apopxin Green, CytoCalcein Violet 450, 7-AAD).
Main Results:
- Synthesized Pcs exhibited minimal dark toxicity, confirming their safety as photosensitizers.
- Cationic Pcs, especially HQZnPc, demonstrated significant PDT-induced cytotoxicity and ROS generation.
- HQZnPc primarily induced apoptosis in cancer cell lines, with FaDu cells showing the highest sensitivity.
- ROS generation was observed at both immediate (30 min) and delayed (24 h) time points post-PDT.
Conclusions:
- HQZnPc exhibits strong potential as a photosensitizer for cancer therapy due to its high PDT efficacy and apoptosis-inducing properties.
- The study provides insights into the mechanisms of Pc-mediated PDT, including ROS generation and cell death pathways.
- Further research is warranted to explore HQZnPc's delivery and efficacy in more complex tumor models.
