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Published on: July 12, 2012
[Relationship between mRNA expression of MnSOD and manganese neurotoxicity]
Xiao-li Fan1, Yong-jian Yan, Shao-lei Cai
1Shandong Academy of Occupational Health and Occupational Medicine 250002, China.
Objective:
To investigate the relationship between mRNA expression of manganese superoxide dismutase (MnSOD) and manganese neurotoxicity.
Methods:
Thirty-one patients with occupational chronic manganese poisoning (case group), as well as 31 controls exposed to the same condition (control group), were included in the study. Whole blood RNA was extracted, and the mRNA expression of MnSOD was measured by RT-PCR; the two groups were compared in terms of the mRNA expression of MnSOD. PC12 cells were treated with 0, 100, 200, 400, 600, 800, and 1000 ümol/L MnCl₂ for l, 2, 3, and 4 d; the cell viability was determined by MTT assay, and the mRNA expression of MnSOD was measured by RT-PCR.
Results:
The case group had significantly lower mRNA expression of MnSOD than the control group (0.390 ± 0.080 vs 0.582 ± 0.219, P < 0.05). MnCl2 had a toxic effect on PC12 cells; the concentration of MnCl₂ was positively correlated with the toxic effect but negatively correlated with the mRNA expression of MnSOD.
Conclusion:
MnSOD mRNA may be involved in the manganese-induced damage of nerve cells. It is hypothesized that high mRNA expression of MnSOD may play an inhibitory effect on manganese neurotoxicity.
Insights
Occupational manganese exposure is linked to lower manganese superoxide dismutase (MnSOD) mRNA expression. Increased MnSOD mRNA may protect against manganese neurotoxicity.
Area of Science:
- Environmental toxicology
- Neuroscience
- Molecular biology
Context:
- Chronic manganese poisoning poses significant occupational health risks.
- Manganese neurotoxicity affects nerve cells, leading to potential neurological deficits.
- Manganese superoxide dismutase (MnSOD) is a critical antioxidant enzyme.
Purpose:
- To investigate the correlation between manganese superoxide dismutase (MnSOD) mRNA expression and manganese-induced neurotoxicity.
- To compare MnSOD mRNA levels in individuals with occupational manganese poisoning versus controls.
- To examine the effect of manganese chloride (MnCl₂) on MnSOD mRNA expression and cell viability in vitro.
Summary:
- Patients with chronic manganese poisoning exhibited significantly lower whole blood MnSOD mRNA expression compared to controls.
- In vitro studies demonstrated that manganese chloride (MnCl₂) exposure reduced MnSOD mRNA expression in PC12 cells in a dose-dependent manner.
- MnCl₂ exposure was found to be toxic to PC12 cells, with higher concentrations correlating with increased toxicity and decreased MnSOD mRNA levels.
Impact:
- Findings suggest MnSOD mRNA plays a role in mitigating manganese-induced nerve cell damage.
- Elevated MnSOD mRNA expression may offer a protective mechanism against manganese neurotoxicity.
- This research highlights a potential biomarker and therapeutic target for manganese-related neurological conditions.
