Cu(II) flavonoids as potential photochemotherapeutic agents

Area of Science:

• Coordination Chemistry
• Materials Science
• Cancer Biology

Background:

• Flavonoids are natural polyphenols with significant health benefits.
• Copper(II) complexes are explored for their cytotoxic properties.
• Photodynamic therapy offers targeted cancer treatment.

Purpose of the Study:

• Synthesize and characterize novel copper(II) flavonoid complexes.
• Evaluate their in vitro photo-triggered cytotoxicity in cancer cells.
• Investigate their interaction with biomolecules like DNA and proteins.

Main Methods:

• Synthesis of six [Cu(L1)(L2)](ClO4) complexes using various flavonoids and ligands.
• Characterization using single-crystal X-ray diffraction and cyclic voltammetry.
• In vitro cytotoxicity assays on A549, MCF-7 cancer cells, and HPL1D normal cells under visible light and in darkness.

Main Results:

• Successfully synthesized and characterized six Cu(II) flavonoid complexes.
• Complexes exhibited dose-dependent photocytotoxicity against A549 and MCF-7 cells, with low dark toxicity.
• Demonstrated significant binding to human serum albumin (HSA) and calf thymus DNA (ct-DNA).
• Visible light exposure led to reactive oxygen species generation and apoptosis induction.
• Complex 6 showed preferential localization in mitochondria of A549 cells.

Conclusions:

• The synthesized copper(II) flavonoid complexes are effective photocytotoxic agents against cancer cells.
• Their mechanism involves ROS generation and induction of apoptosis, with selectivity towards cancer cells.
• These complexes hold promise for developing novel photodynamic cancer therapies.