腦源性神經(jīng)營(yíng)養(yǎng)因子對(duì)皮層神經(jīng)元的保護(hù)作用及其機(jī)制
[Abstract]:Part one: morphological observation of cortical neurons in vitro and microscopic observation objective: to study the methods of cortical neurons culture in vitro and to understand the ultrastructural characteristics of cortical neurons. The cortical tissue was removed by mechanical separation, the tissue was shredded and digested by trypsin, the cell suspensions were obtained by centrifugation and cultured with 10% fetal bovine serum for 12 hours with 27 serum-free culture. The morphological and structural characteristics of the cells were observed under microscope: the cortical neurons began to grow into axons 4 hours after inoculation, but the axons were a little short, and the axons were longer at 12 hours and had a strong sense of stereosome. Transparent and shiny. By the 4th day, the primary connection between axons was established, and on the 7th day, the connections between axons were fully established and closely intertwined into networks. Conclusion: under the condition of stable culture environment and no pollution, the neurons could be cultured successfully by using 2% B27 in 12 hours. Part two the protective effect of brain-derived neurotrophic factor (BDNF) on cortical neurons injured by glutamate objective: to investigate the protective effect of brain-derived neurotrophic factor (BDNF) on cortical neurons injured by glutamate. Methods: normal control group was established respectively. The glutamate group and the BDNF group, the normal control group, cultured cortical neurons in the same way until the seventh day. Glutamic acid group added 50 渭 mol/L glutamate to cortical neurons for 30 minutes after culture. BDNF group continued to culture for 1 day. BDNF group added 50 ng/ml BDNF into the culture medium of cortical neurons on the 5th day. After 24 hours of exposure, BDNF was added to the culture medium of cortical neurons. The glutamate medium containing 50 渭 mol/L was used for 30 minutes and the original medium was cultured for 24 hours. AO/EB immunofluorescence staining was used to observe the changes of cell morphology under fluorescence microscope and MTT was used to detect the change of apoptosis rate. Results: in Glutamic acid group, the processes were crumpled, broken, apoptotic cells were produced, and the permeability of cell membrane was destroyed. The nuclei were pyknotic or segmented by EB staining (fig. 3C) .BDNF group: the number of damaged cells was relatively small. MTT showed that the apoptosis of cells in the WBDNF group was significantly lower than that in the glutamic acid group. Compared with the control group (1.26 鹵0.06), the cell viability of glutamate group (0.72 鹵0.10) was significantly decreased (P0.05), while that of MTT group (1.14 鹵0.06) was significantly higher than that of glutamate group (P0.01). Apoptosis in glutamate group was significantly higher than that in BDNF group (P0. 05). Study on the mechanism of BDNF protecting cortical neurons from glutamic acid damage part 3: objective: to explore the protective effects of BDNF on cortical neuron immunity Mechanism of Glutamic Acid injury: cultured cells were divided into normal control group and BDNF group. In the glutamate group, the cells of each group were ground, the protein was extracted, the low affinity receptor p75NTR of BDNF was detected by western-blot, and the downstream signal molecule JNKN ERK was detected. Results there was no significant difference in the expression of p75NTR between the two groups. The expression of JNK in the BDNF group was significantly lower than that in the glutamate group. It is discussed that: BDNF can protect cerebral cortical neurons from glutamic acid-induced damage by regulating the ratio of neuron receptors, upregulating ERK and down-regulating JNKs, thus promoting cell survival and reducing cell apoptosis.
【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】:2010
【分類號(hào)】:R33
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