Induction of apoptosis by melamine in differentiated PC12 cells
Yang-guang Han1, Shi-chang Liu, Tao Zhang
1Ministry of Education Nankai University, Tianjin, China.
Abstract:
Melamine (2, 4, 6-triamino-1, 3, 5-triazine) was found in milk powder as an additive to raise the measured protein content in 2008 and thereby resulted in the outbreak of renal failure in infants in China. Previous studies focused on the renal toxicity in dogs and in cats. However, the toxicity of melamine in the central nervous system (CNS) is of little concern. The purpose of this study was to assess the possibility of melamine toxicity in differentiated PC12 cells. MTT assay indicated that melamine (above 33 μg/ml and 12 h) inhibited the proliferation of differentiated PC12 cells in a concentration- and time-dependent manner. Hoechst 33258 staining and flow cytometry assay showed that melamine induced the apoptotic cell death rather than necrosis in a dose-dependent manner. Reduced superoxide dismutase activity indirectly indicated that melamine could cause oxidative damage in differentiated PC12 cells. These results suggest that melamine is able to cause cytotoxicity in differentiated PC12 cells with involvement of oxidative damage and will provide evidence for further research on the potential toxicity in CNS.
Insights
Melamine exposure can harm nerve cells. This study found melamine causes cell death and oxidative damage in differentiated PC12 cells, suggesting potential central nervous system toxicity.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Melamine, used to inflate protein content, caused infant renal failure in 2008.
- Previous research focused on melamine's renal toxicity in animals.
- Melamine's impact on the central nervous system (CNS) remains under-explored.
Purpose of the Study:
- To investigate melamine's potential toxicity in differentiated PC12 cells, a model for neuronal function.
- To assess melamine's effects on cell proliferation, cell death pathways, and oxidative stress.
Main Methods:
- PC12 cells were treated with varying concentrations and durations of melamine exposure.
- Cell proliferation was measured using MTT assay.
- Apoptosis and necrosis were assessed via Hoechst 33258 staining and flow cytometry.
- Oxidative damage was inferred from superoxide dismutase (SOD) activity.
Main Results:
- Melamine inhibited PC12 cell proliferation in a concentration- and time-dependent manner (above 33 μg/ml and 12 h).
- Melamine induced dose-dependent apoptotic cell death, not necrosis.
- Reduced SOD activity suggested melamine-induced oxidative damage.
Conclusions:
- Melamine exhibits cytotoxicity in differentiated PC12 cells.
- Oxidative damage is implicated in melamine's toxic effects on these neuronal cells.
- Findings support further investigation into melamine's potential neurotoxicity.
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