職業(yè)性慢性錳中毒人群及染錳PC12細(xì)胞中MnSOD基因表達(dá)水平變化研究
[Abstract]:[background]
Manganese is an essential trace element of human body and an important environmental and industrial pollutant. Because of occupational, iatrogenic and environmental contact, manganese is absorbed mainly through the respiratory tract, and the content of manganese in the body increases. Manganese enters the brain through the blood-brain barrier and damages the central nervous system. Occupational chronic manganese poisoning has attracted more and more attention due to the increased incidence. The typical symptoms of manganese poisoning are tremor and increased muscle tone, similar to Parkinson's syndrome. Learning and memory can also occur. Significant impairments in function, cognitive function and spatial orientation, and symptoms of obvious emotional changes such as crying, irritability, timidity, fear of others, loneliness and autism.
The mechanism of neurotoxicity of manganese is still unclear, mainly involved in oxidative stress, mitochondrial damage, neurotransmitter metabolism and apoptosis. In oxidative stress and mitochondrial damage mechanism, the main antioxidant manganese superoxide dismutase (MnSOD) plays an important role. Gene polymorphism is associated with the susceptibility to occupational chronic manganese poisoning and may be a susceptible gene.
[research purposes]
The differences of MnSOD mRNA expression between the occupational chronic manganese poisoning patients and the control group were observed. The changes of cell proliferation inhibition and MnSOD mRNA expression in the in vitro cell model under the effect of different time and dose of manganese were investigated. The mechanism of action.
[research methods]
1. Thirty-one cases of occupational chronic manganese poisoning were selected as the case group. The case diagnosis was based on the national diagnostic standard of occupational chronic manganese poisoning GBZ3-2006. The patients were selected as the same sex, the same type of work, the same workshop, the same period of work, the working age (difference < 3 years), the age (difference < 5 years), the personal life history and the family genetic history were similar. The expression of MnSOD gene RNA was detected by semi-quantitative RT-PCR. The difference of gene expression between the case group and the control group was statistically analyzed. The relationship between MnSOD gene expression and occupational chronic manganese poisoning was analyzed.
2. Rat adrenal pheochromocytoma cells (PC12) were cultured in 0,100,200,400,600,800,1000 micromol/LMnCl 2 medium for 1,2,3,4 days respectively. The proliferation and morphological changes of PC12 cells were observed under light microscope. The cytotoxicity of manganese was determined by MTT. RNA was extracted and RNA expression was detected by RT-PCR. Horizontal variation.
[results]
There was no significant difference in sex composition, age and length of service between the control group and the case group; the expression level of MnSOD gene mRNA was significantly different between the occupational chronic manganese poisoning group and the control group (t=-4.589, P < 0.05), the 95% confidence interval between the two groups was [-0.277, -0.107], and the expression of MnSOD gene in the case group was lower than that in the control group.
The results of 2MTT assay showed that the inhibition of proliferation of PCl2 cells by manganese was time-dependent and concentration-dependent under certain concentration. With the increase of concentration and prolongation of action time, the inhibition of proliferation of PC12 cells by manganese gradually increased; the inhibition rate of growth of PCl2 cells was more than 50% after 3 days of 400 micromol/L MnCl2 treatment. The correlation coefficient between MnCl2 concentration and cell inhibition rate was 0.975, P < 0.05, while the correlation coefficient between MnCl2 action time and cell inhibition rate was 0.116, P > 0.05. MnSOD mRNA expression level in PC12 cells showed that at the same time, the expression level of MnSOD gene RNA in PC12 cells induced by MnCl2 concentration was significantly different (p < 0.05). The correlation coefficient between MnCl2 concentration and RNA relative expression was - 0.958, P < 0.05, and between MnCl2 action time and RNA relative expression was - 0.14, P > 0.05.
[Conclusion]
The expression level of 1MnSOD gene mRNA may be related to the occurrence of occupational chronic manganese poisoning, and the decrease of MnSOD expression may contribute to the occurrence of manganese poisoning.
The higher the concentration of 2MnCl2, the stronger the toxicity, and the less the expression of MnSOD gene mRNA. It is suggested that the expression of MnSOD mRNA may be involved in the process of manganese-induced neurotoxicity. It is speculated that the high expression of 2MnCl2 may inhibit the neurotoxicity of manganese.
【學(xué)位授予單位】:濟(jì)南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:R135.1
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