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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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Pyrophosphate-bridged complexes with picomolar toxicity.

Oluwatayo F Ikotun1, Elizabeth M Higbee, Wayne Ouellette

  • 1Department of Chemistry, Syracuse University, NY 13244-4100, United States.

Journal of Inorganic Biochemistry
|August 12, 2009
PubMed
Summary

New pyrophosphate-bridged metal complexes show potent anticancer activity against drug-resistant ovarian cancer. The cobalt complex exhibits remarkable efficacy, highlighting potential as novel cancer prodrugs.

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Anticancer Metal Complexes: Synthesis and Cytotoxicity Evaluation by the MTT Assay
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Area of Science:

  • Coordination Chemistry
  • Medicinal Inorganic Chemistry
  • Cancer Therapeutics

Background:

  • Pyrophosphate-bridged coordination complexes are a newly emerging class of compounds.
  • Their cytotoxicity has not been previously investigated.
  • Overcoming pyrophosphate hydrolysis is key to their synthesis.

Purpose of the Study:

  • To synthesize and evaluate the cytotoxicity of novel pyrophosphate-bridged metal complexes.
  • To investigate the mechanism of action of these complexes against cancer cells.
  • To explore their potential as prodrugs for drug-resistant cancers.

Main Methods:

  • Synthesis of three pyrophosphate-bridged complexes: {[Ni(phen)(2)](2)(mu-P(2)O(7))}.27H(2)O, {[Cu(phen)(H(2)O)](2)(mu-P(2)O(7))}.8H(2)O, and {[Co(phen)(2)](2)(mu-P(2)O(7))}.6MeOH.
  • Cytotoxicity assays using the adriamycin-resistant ovarian cancer cell line A2780/AD.
  • Mechanistic studies including DNA interaction, topoisomerase I inhibition, oxidative stress analysis (glutathione levels), and hydrolysis investigation (spectroscopy, NMR, microscopy).

Main Results:

  • The cobalt complex demonstrated highly significant cytotoxicity, with IC50 values as low as 160pM at 72h.
  • Mechanistic investigations revealed interactions with DNA, inhibition of topoisomerase I, and induction of oxidative stress.
  • Hydrolysis played a role in cellular uptake and toxicity, with comparisons made to cisplatin.

Conclusions:

  • Pyrophosphate-bridged metal complexes represent a novel class of potent anticancer agents.
  • The cobalt complex shows exceptional efficacy against drug-resistant ovarian cancer cells.
  • These complexes hold significant promise as a new generation of prodrugs for cancer treatment.