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Updated: Apr 12, 2026
Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
Anticancer Agents: Does a Phosphonium Behave Like a Gold(I) Phosphine Complex? Let a "Smart" Probe Answer!
Moussa Ali1, Lucile Dondaine2,3, Anais Adolle2,3
1†Institut de Chimie Moléculaire de l'Université de Bourgogne, ICMUB UMR CNRS 6302, 9 Avenue Alain Savary, BP 47870, Dijon Cedex, 21078, France.
Abstract:
Gold phosphine complexes, such as auranofin, have been recognized for decades as antirheumatic agents. Clinical trials are now underway to validate their use in anticancer or anti-HIV treatments. However, their mechanisms of action remain unclear. A challenging question is whether the gold phosphine complex is a prodrug that is administered in an inactive precursor form or rather that the gold atom remains attached to the phosphine ligand during treatment. In this study, we present two novel gold complexes, which we compared to auranofin and to their phosphonium analogue. The chosen ligand is a phosphine-based smart probe, whose strong fluorescence depends on the presence of the gold atom. The in vitro biological action of the gold complexes and the phosphonium derivative were investigated, and a preliminary in vivo study in healthy zebrafish larvae allowed us to evaluate gold complex biodistribution and toxicity. The different analyses carried out showed that these gold complexes were stable and behaved differently from phosphonium and auranofin, both in vitro and in vivo. Two-photon microscopy experiments demonstrated that the cellular targets of these gold complexes are not the same as those of the phosphonium analogue. Moreover, despite similar IC50 values in some cancer cell lines, gold complexes displayed a low toxicity in vivo, in contrast to the phosphonium salt. They are therefore suitable for future in vivo investigations.
Insights
Novel gold phosphine complexes show promise as anticancer agents. These compounds are stable, exhibit distinct cellular targets, and demonstrate low toxicity in vivo, unlike phosphonium salts.
Area of Science:
- Inorganic Chemistry
- Medicinal Chemistry
- Biochemistry
Background:
- Gold phosphine complexes, like auranofin, are known antirheumatic drugs with potential anticancer and anti-HIV applications.
- The precise mechanism of action and in vivo behavior of gold phosphine complexes remain unclear, particularly regarding their stability and target interactions.
- Investigating whether gold complexes act as prodrugs or maintain gold-ligand integrity during treatment is crucial.
Purpose of the Study:
- To synthesize and characterize novel gold phosphine complexes with a fluorescent smart probe ligand.
- To compare the in vitro biological activity, in vivo biodistribution, and toxicity of these new gold complexes against auranofin and a phosphonium analogue.
- To elucidate the cellular targets and stability of the gold complexes using advanced imaging techniques.
Main Methods:
- Synthesis and characterization of novel gold phosphine complexes and a phosphonium analogue.
- In vitro biological assays to determine cytotoxicity (IC50 values) in cancer cell lines.
- In vivo studies in zebrafish larvae for biodistribution and toxicity assessment.
- Two-photon microscopy to visualize cellular localization and target interactions.
Main Results:
- The novel gold complexes demonstrated stability in vitro and in vivo, distinct from auranofin and the phosphonium analogue.
- Two-photon microscopy revealed different cellular targets for the gold complexes compared to the phosphonium analogue.
- Despite comparable in vitro anticancer activity in some cell lines, the gold complexes exhibited significantly lower in vivo toxicity than the phosphonium salt.
Conclusions:
- The studied gold phosphine complexes are stable and possess unique biological properties.
- Their distinct cellular targets and low in vivo toxicity suggest potential for development as therapeutic agents.
- These findings support further in vivo investigation of gold phosphine complexes for anticancer applications.
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