In control group,the upregulation of MMP-9 began at ischemic reperfusion 6h,increased at 12h and reached a maximum at 2d,then subsided gradually at 3d to sham group level at 14d.

• 对照组缺血侧脑组织MMP-9阳性细胞于再灌注后6h开始出现,12h明显增高,至2d达高峰,3d开始减少,至14d时恢复至假手术组水平。