Antiinflammatory Effects of Orientin-2″-O-Galactopyranoside on Lipopolysaccharide-Stimulated Microglia

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概要

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• Microglia activation-mediated neuroinflammation plays an important role in the pathogenesis of neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease, multiple sclerosis, and human immunodeficiency virus (HIV)-associated dementia. Inhibition of microglia activation may alleviate neurodegeneration under neuroinflammatory conditions. In the present study, we compared three flavone C-glycosides extracted from Trollius chinensis BUNGE using a cell-based assay to evaluate their antiinflammatory effects on microglial cells. The results showed that orientin-2″-O-galactopyranoside (OGA) significantly inhibited the production of nitric oxide and tumor necrosis factor (TNF)-α in lipopolysaccharide (LPS)-stimulated microglial cells. OGA also markedly inhibited the LPS-induced expression of TNF-α, interleukin-1β, inducible nitric oxide (NO) synthase, and cyclooxygenase-2, which was accompanied by suppression of the activation of nuclear factor (NF)-κB and the extracellular signal-regulated kinase (ERK) signal pathway. In addition, OGA decreased LPS-induced reactive oxygen species generation, which appears to be related to the activation of the NF-E2-related factor2 (NRF2)/ heme oxygenase-1 (HO-1) pathway in BV-2 microglial cells. Furthermore, OGA reduced the cytotoxicity of activated microglia toward HT-22 neuroblastoma cells in a co-culture system. Taken together, the present study demonstrated that the induction of HO-1-mediated inhibition of the NF-κB and ERK pathways contributes significantly to the antineuroinflammatory and neuroprotective effects elicited by OGA.

著者

• Gao Bo

  Department Of Public Health Hua Xi Medical Center Of Sichuan University

• Jia Jia

  Department Of Mechanical Engineering Shandong Jiaotong University

• Zhou Xiang

  Department of Cardiology, The Second Affiliated Hospital of Soochow University, China

• Liu Jiang-yun

  Department of Traditional Chinese Medicine, College of Pharmaceutical Sciences, Soochow University

• Gan Ping

  Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University

• Zheng Long

  Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University

• Hao Lili

  Department of Traditional Chinese Medicine, College of Pharmaceutical Sciences, Soochow University

• Tao Li

  Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University

• Zhen Xuechu

  Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University

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