White matter injury is the major pathological alteration of subcortical ischemic vascular dementia(SIVD)caused by chronic cerebral hypoperfusion.It is characterized by progressive demyelination,apoptosis of oligodendrocytes and microglial activation,which leads to impairment of cognitive function.Triptolide exhibits a variety of pharmacological activities including anti-inflammation,immunosuppression and antitumor,etc.In this study,we investigated the effects of triptolide on white matter injury and cognitive impairments in mice with chronic cerebral hypoperfusion induced by the right unilateral common carotid artery occlusion(rUCCAO).We showed that triptolide administration alleviated the demyelination,axonal injury,and oligodendrocyte loss in the mice.Triptolide also improved cognitive function in novel object recognition test and Morris water maze test.In primary oligodendrocytes following oxygen-glucose deprivation(OGD),application of triptolide(0.001-0.1 nM)exerted concentration-dependent protection.We revealed that the protective effect of triptolide resulted from its inhibition of oligodendrocyte apoptosis via increasing the phosphorylation of the Src/Akt/GSK3β pathway.Moreover,triptolide suppressed microglial activation and proinflammatory cytokines expression after chronic cerebral hypoperfusion in mice and in BV2 microglial cells following OGD,which also contributing to its alleviation of white matter injury.Importantly,mice received triptolide at the dose of 20 pg·kg-1·d-1 did not show hepatotoxicity and nephrotoxicity even after chronic treatment.Thus,our results highlight that triptolide alleviates whiter matter injury induced by chronic cerebral hypoperfusion through direct protection against oligodendrocyte apoptosis and indirect protection by inhibition of microglial inflammation.Triptolide may have novel indication in clinic such as the treatment of chronic cerebral hypoperfusion-induced SIVD.

Yu-shan Wan;Yi You;Qian-yun Ding;Yi-xin Xu;Han Chen;Rong-rong Wang;Yu-wen Huang;Zhong Chen;Wei-wei Hu;Lei Jiang

Department of Pharmacology and Department of Pharmacy of the Second Affiliated Hospital,NHC and CAMS Key Laboratory of Medical Neurobiology,Department of Anatomy,School of Basic Medical Science,Zhejiang University School of Medicine,Hangzhou 310058,China;College of Pharmaceutical Sciences,Zhejiang Chinese Medical University,Hangzhou 310053,China;Department of Clinical Pharmacy,The First Affiliated Hospital,College of Medicine,Zhejiang University,Hangzhou 310003,China

中国药理学报（英文版）

[1]Yu-shan Wan;Yi You;Qian-yun Ding;Yi-xin Xu;Han Chen;Rong-rong Wang;Yu-wen Huang;Zhong Chen;Wei-wei Hu;Lei Jiang-.Triptolide protects against white matter injury induced by chronic cerebral hypoperfusion in mice)[J].中国药理学报（英文版）,2022(01):15-25

SIVD,rUCCAO,whiter

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