Abstract
Superparamagnetic iron oxide nanoparticles (IONPs) have been widely applied in numerous biomedical fields. The evaluation of the toxicity of IONPs to the environment and human beings is indispensable to guide their applications. IONPs are usually considered to have good biocompatibility; however, some literatures have reported the toxicity of IONPs in vitro and in vivo. The controversy surrounding the biocompatibility of IONPs prompted us to carefully consider the biological effects of IONPs, especially under stress conditions. However, the potential risks of IONPs under stress conditions have not yet been evaluated in depth. Acrolein is widespread in the environment and modulates stress-induced gene activation and cell death in many organs and tissues. In this study, we assessed the sensitivity of H9c2 cardiomyocyte cells embedded with IONPs to acrolein and investigated the possible molecular mechanisms involved in this sensitivity. IONPs, which alone exhibited no toxicity, sensitized the H9c2 cardiomyocytes to acrolein-induced dysfunction. The IONP/acrolein treatment induced a loss of viability, membrane disruption, reactive oxygen species (ROS) generation, Erk activation, mitochondrial and lysosomal dysfunction, and necrosis in H9c2 cells. Treatment with an ROS generation inhibitor (diphenyleneiodonium) or an iron chelator (deferoxamine) prevented the IONP/acrolein-induced loss of viability, suggesting that ROS and IONP degradation facilitated the toxicity of the IONP/acrolein treatment in H9c2 cells. Our data suggest that cells embedded in IONPs are more vulnerable to oxidative stress, which confirms the hypothesis that nanoparticles can sensitize cells to the adverse effects of external stimulation. The present work provides a new perspective from which to evaluate the interactions between nanoparticles and cells.
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Abbreviations
- AO:
-
Acridine orange
- ATP:
-
Adenosine 5′-triphosphate
- BCA:
-
Bicinchoninic acid assay
- BSA:
-
Bovine serum albumin
- DHE:
-
Dihydroethidium
- DLS:
-
Dynamic light scattering
- DMEM:
-
Dulbecco’s modified eagle medium
- DNPH:
-
2,4-Dinitrophenylhydrazine
- DPI:
-
Diphenyleneiodonium
- EGF:
-
Epidermal growth factor
- Erk:
-
Extracellular signal-regulated kinase
- ESCs:
-
Embryonic stem cells
- FBS:
-
Fetal bovine serum
- GSH:
-
Glutathione reduced
- HCM:
-
Human cardiac myocytes
- IONPs:
-
Superparamagnetic iron oxide nanoparticles
- JC-1:
-
CBIC2(3), 5,5′,6,6′-tetrachloro-1,1′,3,3′-tetra ethylbenzimidazolylcarbocyanine iodide
- JNK:
-
c-Jun N-terminal kinase
- LAMP1:
-
Lysosome-associated membrane protein 1
- LDH:
-
Lactate dehydrogenase
- MDC:
-
Monodansylcadaverine
- MTT:
-
3-(4,5)-Dimethylthiahiazo (-z-y1)-3,5-di-phenytetrazoliumromide
- MRI:
-
Magnetic resonance imaging
- NDA:
-
2,3-Naphthalenedicarboxaldehyde
- NOX:
-
Nicotinamide adenine dinucleotide phosphate oxidase
- PBS:
-
Phosphate-buffered saline
- PI:
-
Propidium iodide
- RIP:
-
Receptor-interacting protein
- ROS:
-
Reactive oxygen species
- tBHP:
-
Tert-butyl hydroperoxide
- TEM:
-
Transmission electron microscope
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Acknowledgments
This study was partially supported by the National Natural Science Foundation of China, Key Program 30930105, Foundation of Xi’an Jiaotong University, New Century Excellent Talents in University, the National Natural Science Foundation of China (Grant No. 31070740), and the 985 and 211 Projects of Xi’an Jiaotong University.
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The authors confirm that there are no known conflicts of interest associated with this publication and there has been no significant financial support for this work that could have influenced its outcome.
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Luo, C., Li, Y., Yang, L. et al. Superparamagnetic iron oxide nanoparticles exacerbate the risks of reactive oxygen species-mediated external stresses. Arch Toxicol 89, 357–369 (2015). https://doi.org/10.1007/s00204-014-1267-x
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DOI: https://doi.org/10.1007/s00204-014-1267-x