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Apoptosis caused by imidazolium-based ionic liquids in PC12 cells
Xiao-Yu Li1, Chang-Qin Jing, Wen-Long Lei
1College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China. lixiaoyu65@263.net
Ecotoxicology and Environmental Safety
|July 10, 2012
Summary
Alkylmethylimidazolium-based ionic liquids show dose-dependent cytotoxicity on PC12 cells, with longer chains increasing toxicity. 1-octyl-3-methylimidazolium bromide ([C(8)mim]Br) induces apoptosis via reactive oxygen species (ROS) and mitochondrial depolarization.
Area of Science:
- Environmental toxicology
- Cell biology
- Materials science
Background:
- Ionic liquids (ILs) are versatile solvents with potential applications.
- Understanding the toxicological profiles of ILs is crucial for safe usage.
- Alkylmethylimidazolium-based ILs are common but their cellular effects require detailed investigation.
Purpose of the Study:
- To evaluate the cytotoxicity of alkylmethylimidazolium-based ionic liquids on rat pheochromocytoma (PC12) cells.
- To elucidate the mechanisms underlying IL-induced cytotoxicity, focusing on apoptosis.
- To correlate structural features of ILs with their toxicological impact.
Main Methods:
- Cytotoxicity assessed using MTT assay, lactate dehydrogenase (LDH) release, and acridine orange staining.
- Mitochondrial depolarization, DNA fragmentation, reactive oxygen species (ROS) levels, and caspase-3 activity were quantified.
- PC12 cells were exposed to varying concentrations of different ILs, including 1-octyl-3-methylimidazolium bromide ([C(8)mim]Br).
Main Results:
- A dose-dependent cytotoxicity of alkylmethylimidazolium-based ILs was observed in PC12 cells.
- ILs with longer lateral alkyl chains exhibited stronger cytotoxicity.
- [C(8)mim]Br induced significant LDH release, mitochondrial depolarization, DNA fragmentation, increased ROS, and caspase-3 activity.
Conclusions:
- [C(8)mim]Br induces apoptosis in PC12 cells through a mechanism involving excessive ROS production and mitochondrial depolarization.
- The findings provide insights into the cytotoxicity mechanisms of alkylmethylimidazolium-based ILs.
- This research contributes to the safe application and risk assessment of these ionic liquids.
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