載脂蛋白E對實(shí)驗(yàn)性自身免疫腦脊髓炎血腦屏障通透性的影響
[Abstract]:Objective to investigate the effects of apolipoprotein E (ApoE) on metalloproteinase-9 (MMP-9) and blood-brain barrier permeability in (EAE) mice with experimental autoimmune encephalomyelitis. Methods the wild-type (WT) and ApoE knockout type (ApoE-/-) mice of C57BL/6J species were induced by myelin oligodendrocyte glycoprotein polypeptide (MOG35-55) as antigen to establish EAE model, E-WT group and E-ApoE-r- group, and normal control (C) C-WT group and C-ApoE-r-group respectively. The permeability of BBB was evaluated by intravenous injection of Evans blue (EB) and determination of EB osmotic content in brain tissue. The expression of matrix metalloproteinase-9 (MMP-9) and tissue inhibitor of matrix metalloproteinase-1 (TIMP-1) was detected by immunohistochemical method. The mRNA transcription and protein expression of MMP-9,TIMP-1 and Occludin,Claudin-5 in brain tissue were detected by real-time fluorescence quantitative RT-PCR,Western blot. The expression of MMP-9 activity was analyzed by gelatinase spectrum. Results compared with the E-WT group, the average score and peak score of the E-ApoE-r- group were significantly higher than those of the E-WT group (P0.05), but there was no significant statistical significance in the latency comparison (P0.05). At the same time, the content of EB in brain tissue was significantly higher than that in E-WT group (P0.05). Compared with normal group, the expression of mRNA and protein of occludin and claudin-5 in brain tissue of E-WT group and E-ApoE-r- group were significantly decreased (P0.05), while the mRNA and protein expression of occludin and claudin-5 in E-ApoE-r- group were lower than those in E-WT group (P0.05). In addition, compared with the normal group, the expression of MMP-9 mRNA, protein in the brain tissue of the E-ApoE-r-group and E-WT group was significantly higher than that of the normal group (P0.05), but the expression of mRNA, protein in E-ApoE-r-group was higher than that in the E-WT group (P0.05). Compared with the normal group, the mRNA and protein expression of TIMP-1 in the brain tissue of the E-ApoE-r-group and E-WT group were decreased (P0.05), and the expression of E-ApoE-r- group was slightly lower than that of the E-WT group (P0.05). Conclusion the deficiency of ApoE can aggravate the progression of EAE and aggravate the damage of the integrity of blood-brain barrier, thus promoting the infiltration of inflammatory cells. The mechanism of the damage of blood-brain barrier integrity may be closely related to the increase of MMP-9 expression and the enhancement of its activity. It is suggested that ApoE plays a protective role in maintaining the integrity of blood-brain barrier during the pathogenesis of EAE, which may be another therapeutic target for MS/EAE.
【學(xué)位授予單位】:廣西醫(yī)科大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:R744.3
【共引文獻(xiàn)】
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