Mustards-Derived Terpyridine-Platinum Complexes as Anticancer Agents: DNA Alkylation vs Coordination

Area of Science:

• Medicinal Chemistry
• Inorganic Chemistry
• Cancer Research

Background:

• Bifunctional platinum complexes are promising anticancer agents.
• Targeting DNA via multiple binding modes enhances therapeutic potential.
• Platinum(II) terpyridine complexes offer a scaffold for novel metallodrug design.

Purpose of the Study:

• To synthesize and characterize novel platinum(II) terpyridine complexes.
• To evaluate the in vitro antiproliferative activity of these complexes against human cancer cell lines.
• To investigate the mechanism of action and biomolecular interactions of the platinum complexes.

Main Methods:

• Synthesis of platinum(II) terpyridine complexes.
• In vitro antiproliferative assays against HCT116, SW480, NCI-H460, and SiHa cell lines.
• 1H NMR spectroscopy, ESI-MS, and protein crystallography to study stability, reactivity, and binding modes.

Main Results:

• Platinum complexes exhibited potent in vitro antiproliferative activity, though generally lower than their terpyridine ligands.
• Complex PtL3 rapidly bound to biomolecules via Pt coordination.
• Complex PtL4 demonstrated both Pt coordination and alkylation of 9-ethylguanine.
• Protein crystallography identified His15 (Nδ1 atom) as the binding site for PtL3 on hen egg white lysozyme.

Conclusions:

• The synthesized platinum(II) terpyridine complexes display significant antiproliferative effects.
• The complexes exhibit distinct DNA and protein interaction mechanisms, offering potential for targeted cancer therapy.
• Further investigation into these bifunctional metallodrugs could lead to new anticancer strategies.