目的观察移植小胶质细胞是否可聚集在大鼠脑内β淀粉样蛋白(Aβ)周围并吞噬Aβ颗粒。方法在大鼠左右侧海马内分别注射Aβ42与生理盐水,3d后经颈内动脉将体外培养的持续表达增强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)的小胶质细胞注入大鼠体内,小胶质细胞注射后3d分别计数双侧海马内荧光细胞并在共聚焦显微镜下观察移植小胶质细胞是否吞噬Aβ颗粒。结果移植小胶质细胞聚集在Aβ沉积物周围,荧光显微镜下计数Aβ注射侧的EGFP阳性细胞数明显高于生理盐水注射侧的细胞数(P<0.05)。部分移植小胶质细胞吞噬Aβ沉积物,细胞内出现Aβ信号。结论移植小胶质细胞聚集在大鼠海马区Aβ沉积物周围,并摄取部分Aβ。
OBJECTIVE There is a close correlation between interleukin-6 (IL-6) and malignant proliferation of gliomas. We investigated the effect of bradykinin on the expression of IL-6 in C6 glioma cells. METHODS Semi-quantitive RT-PCR and radioimmunoassay were used to examine the effect of bradykinin on the expression of IL-6 in C6 glioma cells and on the level of IL-6 in the culture medium. RESULTS Using semi-quantitive RT-PCR , the expression of IL-6 mRNA was examined in C6 glioma cells at 0, 5, 10,15, 30, 60 min following addition of 1 μmol/L bradykinin. There was no statistical difference in expression of IL-6 mRNA between the treatment and control groups (P>0.05) and IL-6 was not detected in the cell culture medium. CONCLUSION Within an hour, IL-6 expression in C6 glioma cells is not induced by bradykinin, suggesting that its clinical application may be useful as a potential therapeutic agent for tumors of the central nervous system.
