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Updated: Feb 19, 2026
Anticancer Metal Complexes: Synthesis and Cytotoxicity Evaluation by the MTT Assay
Published on: November 10, 2013
Novel Gold and Silver Carbene Complexes Exert Antitumor Effects Triggering the Reactive Oxygen Species Dependent
Domenico Iacopetta1, Annaluisa Mariconda2, Carmela Saturnino3
1Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Via Pietro Bucci, 87036, Arcavacata di Rende, Italy.
Abstract:
Cisplatin and other platinum-based drugs are well-known valid anticancer drugs. However, during chemotherapy, the presence of numerous side effects and the onset of frequent phenomena of resistance has pushed many research groups to devise new metal-based compounds holding improved anticancer properties and fewer undesired effects. Amongst the variety of synthesized compounds, significant antiproliferative effects have been obtained by employing organometallic compounds, particularly those based on silver and gold. With this in mind, we synthesized four compounds, two silver complexes and two gold complexes, with good inhibitory effects on the in vitro proliferation of breast and ovarian cancer-cell models. The antitumor activity of the most active compound, that is, AuL4, was found to be ninefold higher than that of cisplatin, and this compound induced dramatic morphological changes in HeLa cells. AuL4 induced PARP-1 cleavage, caspases 3/7 and 9 activation, mitochondria disruption, cytochrome c release in cancer-cell cytoplasm, and the intracellular production of reactive oxygen species. Thus, AuL4 treatment caused cancer-cell death by the intrinsic apoptotic pathway, whereas no cytotoxic effects were recorded upon treating non-tumor cell lines. The reported outcomes may be an important contribution to the expanding knowledge of medicinal bio-organometallic chemistry and enlarge the available anticancer toolbox, offering improved features, such as higher activity and/or selectivity, and opening the way to new discoveries and applications.
Insights
New silver and gold organometallic compounds show potent anticancer activity against breast and ovarian cancer cells. The most effective compound, AuL4, demonstrated significantly higher efficacy than cisplatin and induced cancer cell death via apoptosis with no harm to healthy cells.
Area of Science:
- Medicinal chemistry
- Bioinorganic chemistry
- Cancer research
Background:
- Platinum-based chemotherapy drugs like cisplatin are effective but cause side effects and resistance.
- Research is exploring novel metal-based compounds for improved anticancer therapies.
- Organometallic compounds, especially those involving silver and gold, show promise for antiproliferative effects.
Purpose of the Study:
- To synthesize and evaluate novel silver and gold organometallic complexes for anticancer activity.
- To compare the efficacy of these new compounds against established chemotherapy drugs.
- To elucidate the mechanism of action of the most potent compound in cancer cells.
Main Methods:
- Synthesis of two silver and two gold organometallic complexes.
- In vitro antiproliferative assays on breast and ovarian cancer cell lines.
- Detailed mechanistic studies on the most active compound (AuL4) in HeLa cells, including apoptosis markers and cellular stress indicators.
Main Results:
- Four novel organometallic complexes were synthesized, exhibiting inhibitory effects on cancer cell proliferation.
- The gold complex AuL4 showed significantly higher antitumor activity (ninefold) compared to cisplatin.
- AuL4 induced apoptosis in cancer cells through the intrinsic pathway, involving PARP-1 cleavage, caspase activation, mitochondrial disruption, and reactive oxygen species production.
- AuL4 exhibited selectivity, with no cytotoxic effects observed on non-tumor cell lines.
Conclusions:
- The synthesized gold complex AuL4 represents a promising new anticancer agent with superior efficacy and selectivity.
- AuL4 triggers cancer cell death via the intrinsic apoptotic pathway.
- This study contributes to the field of medicinal bio-organometallic chemistry, offering a potential new tool for cancer therapy.
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