Antiinflammatory Effects of Orientin-2″-<i>O</i>-Galactopyranoside on Lipopolysaccharide-Stimulated Microglia

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  • Zhou Xiang
    Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University
  • Gan Ping
    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
  • Jia Jia
    Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University
  • Gao Bo
    Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University
  • Liu Jiang-yun
    Department of Traditional Chinese Medicine, College of Pharmaceutical Sciences, Soochow University
  • Zheng Long Tai
    Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University
  • Zhen Xuechu
    Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University

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  • Antiinflammatory Effects of orientin 2"-O-Galactopyranoside on Lipopolysaccharide-Stimulated Microglia

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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.

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