Abstract
Citrus peel extract has shown anti-inflammatory and anti-oxidative effects in several tissues. Therefore ，we investigated whether the ethanol extract from Fruit peel of Citrus unshiu MARC. suppresses brain insult-induced excessive microglial activation and neuronal oxidative stress. Releases of NO，the major inflammatory mediator in microglia，and iNOS mRNA expressions were markedly inhibited in a dose-dependent manner following treatment of the ethanol extract from Citrus unshiu MARC. in LPS-stimulated BV-2 microglia cells. In addition, the extract significantly suppressed LPS-induced mRNA expression of pro-inflammatory cytokine TNF-α IL-lβ and IL-6. On the other hand, the thanol extract exerted intracellular ROS scavenging activities in HT-22 neurons in a dose dependent manner (50-400 ug/ml)， suggesting the potent anti-oxidative stress effects in neurons. Taken together，these results suggest that Citrus unshiu MARC. peel extract has therapeutic potential against neuroinflammation and neurodegeneration via suppression of brain insult-induced microglial activation and neuronal oxidative stresses.
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