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Updated: Jul 9, 2026

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Published on: May 28, 2014

A potent cytotoxic photoactivated platinum complex.

Fiona S Mackay¹, Julie A Woods, Pavla Heringová

¹School of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America

|December 21, 2007

Summary

A novel platinum(IV) complex (1) shows high toxicity and unique DNA damage after photoactivation, offering potential for new cancer therapies. It is more effective than cisplatin, even in resistant cells.

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Area of Science:

Inorganic Chemistry
Medicinal Chemistry
Cancer Research

Background:

Platinum(IV) complexes offer potential advantages over platinum(II) drugs like cisplatin due to their stability and redox properties.
Photoactivated chemotherapy (PACT) aims to improve drug selectivity and reduce side effects by activating drugs with light.
Understanding the mechanism of action and DNA interactions of novel platinum complexes is crucial for therapeutic development.

Purpose of the Study:

To characterize the structure and properties of a novel trans, trans, trans-[Pt(N3)2(OH)2(NH3)(py)] complex (1).
To evaluate the phototoxicity and mechanism of action of complex 1 in cancer cells.
To compare the DNA platination and repair profiles of complex 1 with cisplatin.

Main Methods:

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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

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X-ray crystallography to determine the structure of complex 1.

In vitro cytotoxicity assays on various cancer cell lines, including cisplatin-resistant cells.

DNA platination studies using HaCaT skin cells and plasmid DNA.

Single-cell electrophoresis and DNA repair synthesis assays.

Western blotting to assess p53 protein accumulation and caspase 3 pathway activation.

Main Results:

Complex 1, a Pt(IV) complex with linear azido ligands, is stable in the dark but undergoes photoinduced reactions.
Photoactivated complex 1 exhibits significantly higher cytotoxicity (13-80x) than cisplatin, including in cisplatin-resistant ovarian cancer cells.
Complex 1 induces DNA platination similar to cisplatin but forms unusual trans azido/guanine and trans diguanine Pt(II) adducts, along with DNA interstrand and DNA-protein cross-links.
DNA repair synthesis is markedly lower for DNA platinated by photoactivated complex 1 compared to cisplatin.
Cell death is not solely dependent on caspase 3 activation, and p53 protein does not accumulate post-photosensitization.

Conclusions:

The trans diazido Pt(IV) complex 1 possesses remarkable phototoxic properties and unique DNA interaction mechanisms.
Complex 1 represents a promising candidate for photoactivated cancer chemotherapy, offering advantages over existing platinum drugs.
The distinct DNA damage profile and reduced repair suggest a novel therapeutic strategy for overcoming cisplatin resistance.