Abstract
White matter damage is an important contributor to long-term neurological deficit after stroke. Our previous study has shown that inhibition of CD147 ameliorates acute ischemic stroke in mice. In this study, we aimed to investigate whether inhibition of CD147 promotes white matter repair and long-term functional recovery after ischemic stroke.Male adult C57BL/6 mice were subjected to transient (1-h) middle cerebral artery occlusion (tMCAO). Anti-CD147 function-blocking antibody (αCD147) was injected intravenously once daily for 3 days beginning 4 h after onset of ischemia. Sensorimotor and cognitive functions were evaluated up to 28 days after stroke. We found that αCD147 treatment not only prevented neuronal and oligodendrocyte cell death in the acute phase, but also profoundly protected white matter integrity and reduced brain atrophy and tissue loss in the late phase, leading to improved sensorimotor and cognitive functions for at least 28 days after stroke. Mechanistically, we found that αCD147 treatment increased the number of proliferating NG2(+)/PDGFRα(+) oligodendrocyte precursor cells (OPCs) and newly generated mature APC(+)/Sox10(+) oligodendrocytes after stroke, possibly through upregulation of SDF-1/CXCR4 axis in OPCs. In conclusion, inhibition of CD147 promotes long-term functional recovery after stroke, at least in part, by enhancing oligodendrogenesis and white matter repair.