Abstract
Matrix metalloproteinase-9 (MMP-9) plays a beneficial role in the sub-acute phase after ischemic stroke. However, unrestrained MMP-9 may disrupt the blood-brain barrier (BBB), which has limited its use for the treatment of brain ischemia. In the present study, we constructed lentivirus mediated hypoxia-controlled MMP-9 expression and explored its role after stroke. Hypoxia response element (HRE) was used to confine MMP-9 expression only to the hypoxic region of mouse brain after 120-min transient middle cerebral artery occlusion. Lentiviruses were injected into the peri-infarct area on day 7 after transient ischemia. We found hyperexpression of exogenous HRE-MMP-9 under the control of hypoxia, and its expression was mainly located in neurons and astrocytes without aggravation of BBB damage compared to the CMV group. Furthermore, mice in the HRE-MMP-9 group showed the best behavioral recovery compared with the normal saline, GFP, and SB-3CT groups. Therefore, hypoxia-controlled MMP-9 hyperexpression during the sub-acute phase of ischemia may provide a novel promising approach of gene therapy for stroke.
Electronic Supplementary Material
Supplementary material is available for this article at 10.1007/s12264-015-1533-1 and is accessible for authorized users.
Keywords: blood-brain barrier, hypoxia response element, matrix metalloproteinase 9, stroke
Electronic supplementary material
Footnotes
Electronic Supplementary Material
Supplementary material is available for this article at 10.1007/s12264-015-1533-1 and is accessible for authorized users.
Contributor Information
Guo-Yuan Yang, Email: gyyang0626@gmail.com.
Zhijun Zhang, Email: zhangzhij@gmail.com.
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