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Ruscogenin,an important steroid sapogenin derived from Ophiopogon japonicus,has been shown to inhibit cerebral ischemic injury.However,its potential molecular action on blood-brain barrier(BBB)dysfunction after stroke remains unclear.This study aimed to investigate the effects of ruscogenin on BBB dysfunction and the underlying mechanisms in middle cerebral artery occlusion/reperfusion(MCAO/R)-injured mice and oxygen–glucose deprivation/reoxygenation(OGD/R)-injured mouse brain microvascular endothelial cells(bEnd.3).