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Published on: June 21, 2015
Three Noble Metal Nanoparticles Demonstrated Distinct Biological Interactions and Cell Death Pathways in Human
Kacper Wiktorowski1, Kamila Podsiadło1, Nasrin Abbasi Gharibkandi2
1Department of Medical Biophysics, Institute of Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, 90-236, Poland.
Purpose:
New, more effective therapies are needed for patients with liver tumors who are ineligible for surgical resection, transplantation, or local ablation. Noble metal nanoparticles (NPs) exhibit substantial biological reactivity toward liver cancer cells, yet their unpredictable nanotoxicity highlights the need for a deeper understanding of NP-cell interactions. The present study examined the in vitro toxicological properties of gold (Au), palladium (Pd), and Pd-Au NPs in three hepatocellular carcinoma cell lines (HepG2, Hep3B, and Huh7D-12).
Methods:
The cytotoxicity of noble-metal-based NPs was assessed using Alamar Blue and MTT colorimetric assays. Reactive oxygen species generation and oxidative stress markers were quantified by fluorometric, luminometric, and flow cytometry methods. Confocal microscopy combined with fluorescence readouts were used to evaluate mitochondrial homeostasis and programmed cell death pathways. Molecular markers of NP-induced cellular stress were further confirmed using qRT-PCR.
Results:
Distinct cellular differences were observed among the three NPs, particularly in terms of cytotoxicity and death modalities. Au NPs caused mild mitochondrial perturbations without significant cytotoxicity. Pd NPs induced necroptosis, primarily at high concentrations. In contrast, Pd-Au NPs induced oxidative stress, lipid peroxidation, glutathione depletion, and transcriptional changes in the genes regulating glutathione synthesis and metabolism. Pd-Au NPs also activated ferroptosis, which is a regulated cell death pathway increasingly recognized as a promising anticancer strategy.
Conclusion:
Among the tested formulations, Pd-Au NPs exhibited the strongest cytotoxic and antiproliferative effects that were driven by mitochondrial disruption and ferroptosis induction. These in vitro findings provided a mechanistic reason for advancing Pd-Au NP research efforts into in vivo studies and patient-derived preclinical models for hepatocellular carcinoma.
Insights
Palladium-gold nanoparticles (Pd-Au NPs) show significant potential for treating liver tumors by inducing cell death pathways like ferroptosis. Further research into Pd-Au NPs is warranted for hepatocellular carcinoma therapy.
Area of Science:
- Nanotechnology
- Biomedical Engineering
- Oncology
Background:
- Effective therapies for unresectable liver tumors are limited.
- Noble metal nanoparticles (NPs) show promise against cancer cells but require toxicity evaluation.
- Understanding NP-cell interactions is crucial for developing safe and effective nanomedicines.
Purpose of the Study:
- To investigate the in vitro toxicological profiles of gold (Au), palladium (Pd), and palladium-gold (Pd-Au) nanoparticles.
- To assess the cytotoxicity and cellular mechanisms of these NPs in hepatocellular carcinoma cell lines.
- To identify NPs with potent anticancer effects for further preclinical development.
Main Methods:
- Cytotoxicity assessed via Alamar Blue and MTT assays.
- Reactive oxygen species (ROS) and oxidative stress markers quantified.
- Mitochondrial homeostasis and cell death pathways analyzed using confocal microscopy.
- Gene expression changes related to cellular stress evaluated by qRT-PCR.
Main Results:
- Distinct cytotoxic effects observed among Au, Pd, and Pd-Au NPs.
- Pd-Au NPs induced significant oxidative stress, glutathione depletion, and ferroptosis.
- Au NPs showed minimal cytotoxicity, while Pd NPs induced necroptosis at high concentrations.
- Pd-Au NPs demonstrated the strongest antiproliferative effects, driven by mitochondrial disruption and ferroptosis.
Conclusions:
- Pd-Au NPs exhibit potent in vitro cytotoxic and antiproliferative effects against hepatocellular carcinoma cells.
- Ferroptosis induction by Pd-Au NPs presents a promising anticancer strategy.
- These findings support further investigation of Pd-Au NPs in preclinical models for liver cancer.
