不同剂量羊瘙痒因子263K颅内感染仓鼠临床终末期脑中GFAP表达的研究

Analyses of the expressions of GFAP in the brain scrapie strain 263K at terminal stage

目的研究不同剂量羊瘙痒因子263K经颅内注射感染仓鼠后，在发病的终末期星形胶质细胞增生程度是否与注射剂量及潜伏期长短有关。方法以胶质纤维酸性蛋白（glial fibrillary acidic protein，GFAP）作为星形胶质细胞增生的分子标志物，采用Western Blot和免疫组化方法检测感染仓鼠终末期脑匀浆和脑组织病理切片中的GFAP表达，经定量分析比较各感染剂量组间是否存在差异。结果与正常对照相比，不同剂量感染仓鼠发病终末期脑组织GFAP阳性细胞数量和总GFAP含量均明显升高，但各感染剂量组间无显著差异。结论不同感染剂量羊瘙痒因子263K经颅内注射感染仓鼠在发病终末期脑中星形胶质细胞的增生程度相似，与感染剂量及潜伏期无关联性。

Objective To investigate whether gliosis in the brain tissues of the hamsters infected with various amounts of scrapie strain 263K is correlated with the inoculation doses or the incubation times. Methods The total values of glial fibrillary acidic protein （GFAP） in brains were evaluated by Western Blots and the GFAP- stained cells were detected by immunohistochemistry （ IHC ）. The characteristics of GFAP distributions among various groups were defined by quantitive and statistic analyses. Results Compared with the brain tissues of normal hamsters, remarkably higher total GFAP levels and more GFAP-stained cells were observed in the brain tissues of infected ones, howbeit, no significant difference was addressed among the infected groups. Conclusion Inoculations of various amounts of scrapie strain 263K into experimental hamsters intracerebrally induced the similar patterns of gliosis in the brains at the clinically terminal stage, regardless of infectious doses and incubation times.