实验性过敏性脑脊髓炎豚鼠脊髓病理学及Bcl-2和Bax蛋白表达的研究

Pathology and the expression of Bcl- 2 and Bax in spinal cord of guinea pigs in experimental allergic encephalomyelitis

目的:通过观察实验性过敏性脑脊髓炎(EAE)豚鼠脊髓内的病理改变及Bcl-2和Bax蛋白的表达,探讨EAE发病中影响细胞凋亡的机制。方法:采用完全弗氏佐剂和豚鼠脊髓匀浆诱发实验性过敏性脑脊髓炎(EAE)豚鼠模型,动物分别存活14d和28d后取脊髓颈膨大和腰骶膨大段,石蜡切片,HE染色和免疫组化ABC法染色,光镜观察。结果:HE染色发现:除典型的脊髓白质小血管周围的炎性细胞浸润外,在脊髓腹侧静脉、脊髓背侧静脉和沟静脉等较大血管周围也有炎性细胞浸润,28d较14d严重。免疫组化染色发现:模型组脊髓病灶部位和非病灶部位Bcl-2阳性细胞的表达均高于正常组,第28d模型组Bcl-2阳性细胞的表达数目明显高于第14d,模型组Bax阳性细胞的表达比正常组高,在病灶部位Bax的表达第28d高于第14d,而在非病灶部位两个存活期差别不大。结论:实验提示与细胞凋亡密切相关的基因蛋白Bcl-2和Bax参与EAE的发病过程。

AIM: To elucidate the molecular mechanism of apoptosis in inflammatory cells occurring in the central nervous system during experimental allergic encephalomyelitis (EAE), the changes of pathology and the expression of apoptosis-related molecules Bcl-2 and Bax in the spinal cord of guinea pigs in EAE model were observed. METHODS: EAE model was induced in guinea pig. The cervical and lumbosacral enlargement of spinal cord was obmined during the 14 th and 28 th days after modeling. The H & E staining and ABC immunohistochemistry technique were used. RESULTS: HE staining: The lesion in the model was located in the inflammation of small veins, which were surrounded by inflammatory cells. It was specially noticed that inflammatory cells also infiltrated large veins. The lesions in the 28th day were more severe than that in the 14th day. ABC immunohistochemistry staining: The positive expression of Bcl-2 and Bax was obviously increased in the spinal cord of guinea pig with EAE. The number of Bcl-2 positive cells in the 28th day of model group was more than that of the 14th day. The number of Bax positive cells in the 28th day and 14th day of model group did not show obvious difference at un-lesion areas. CONCLUSION: These results suggest that Bcl-2 and Bax may play an important role in EAE.