RESUMO
Objective To investigate protective effects of polysaccharides from Platycarya strobilacea Sieb.et Zucc on cerebral ischemia-reperfusion injury in rats.MethodsForty Wistar rats were randomly divided into four groups:sham group,model group,Rehmannia glutinosa polysaecharide low,and high dose groups.Each group was given oral administration for 7 days.After 1 h of last administration, the CIRI (cerebral ischemia-reperfusion injury) group was produced inserting 5-0 line into the internal carotid artery.Neurological functional score was evaluated according to the method of Zea longa's score, meanwhile,infarct size was detected by TTC staining.Levels of superoxide dismutase (SOD) activity,malondialdehyde (MDA), IL-10, IL-1β and TNF-α contents in cerebral tissues were measured.TUNEL staining was used to assess the number of TUNEL-positive cells of the ischemic cortex.Western blot was used to analyze the expressions of Nrf2 and HO-1 in cerebral tissues.ResultsCompared to model group, Platycarya strobilacea a polysaccharides could significantly improve neurogical functions,greatly decrease the contents of MDA, IL-10 and IL-1β in cerebral tissues,improve SOD activity and IL-10 content in cerebral tissues,and effectively reduce cerebral infarct range.Meanwhile Platycarya strobilacea polysaccharides could enhance the expressions of Nrf2 and HO-1 in cerebral tissues.ConclusionPlatycarya strobilacea polysaccharides have beneficial effects on rats with cerebral ischemia-reperfusion injury, which may be mediated at least in part by the Nrf2/HO-1 pathway.