小鼠社會(huì)挫敗模型前額葉中谷氨酸能神經(jīng)遞質(zhì)的初步研究
[Abstract]:Background Depression is a serious complex mental disorder with high morbidity and mortality. The World Health Organization (WHO) reports that the number of depression patients in the world has reached 322 million. So far, the pathogenesis has been reported including HPA axis disorders, monoaminergic and GABA neurotransmitter disorders, and BDNF abnormal expression theory. Nevertheless, the pathogenesis of depression remains complex and unknown. Therefore, it is very important to actively search for the pathogenesis of depression. Previous studies have found that glutaminergic transmitters play an important role in the study of neuropsychiatric disorders, which is worthy of consideration as a new direction to reveal the pathogenesis of depression and drug targets. The prefrontal lobe, a key neurobrain region that regulates mood, memory and cognition, has been involved in the pathogenesis of depression for decades. Although previous studies have used screening metabolites to measure neurotransmitter changes in depression, the above non-quantitative methods cannot accurately quantify the changes in metabolic processes. To overcome this problem, we used the LC-MS / MS method to quantitatively detect 25 key neurotransmitters in three highly related metabolic pathways for depression. Objective based on the social frustration model of mice, the key neurotransmitters of the tryptophan pathway, GABA pathway and catecholamine pathway, were quantitatively detected by LC-MS / MS method in the prefrontal cortex. Furthermore, the related mechanism of different metabolites was verified and discussed. Method 1. The model of social frustration depression in mice was established, and its behavior was evaluated. The mice were divided into depression group, resistance group and control group according to the social interaction ratio. 2. The prefrontal lobe tissues of 10 mice in depression group, resistance group and control group were detected by LC-MS / MS. The results showed that the substance was the key neurotransmitter of the three pathways of tryptophan pathway, GABA pathway and catecholamine pathway. According to the LC-MS / MS results, the differential transporter glutamate was selected to perform the key enzyme, transporter and receptor for RT-Q PCR and Western blotting. Result 1. Social interaction test was used to evaluate the depression and resistance phenotype of thwarted mice. 13 (46.4%) mice showed depression resistance phenotype. The SI value of depression mice was lower than that of control group and resistance group, and the SI value of resistance group was significantly higher than that of control group and depression group. The levels of glutamate in depression and resistance group were significantly lower than those in control group and resistance group. The levels of L-DOPA and VMA in depression group were significantly higher than those in control group and resistance group. Glutamate metabolic pathway confirmed that the mRNA expression of Glulus Gad1Cad 2 and mGlu R1 in CSDS group was significantly different from that in the control group at the gene expression level. At protein level Glu A1 was changed in CSDS mice compared with control group but no significant change was found in EAAT2 and Glu1. Conclusion the results suggest that the metabolic pathway of excitatory neurotransmitter glutamate plays an important role in social frustration model. Quantitative metabonomics in this study revealed significant changes in L-DOPA and VMA levels in different phenotypes. The changes of glutamate were related to the molecular level of gene and protein in the protein metabolic pathway. While further research is needed to confirm these findings, the regulation of key glutamate transmitters may reveal the pharmacological application of depressive disorders and may help to identify more diagnostic tools and therapeutic targets for the disease.
【學(xué)位授予單位】:重慶醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:R749.4
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