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Protective effect of Phellodendri Cortex against lipopolysaccharide-induced memory impairment in rats

  • Lee, Bom-Bi (Acupuncture and Meridian Science Research Center, College of Oriental Medicine, Kyung Hee University) ;
  • Sur, Bong-Jun (The Graduate School of Basic Science of Oriental Medicine, College of Oriental Medicine, Kyung Hee University) ;
  • Cho, Se-Hyung (Department of Physiology, Neurodegeneration Control Research Center, Kyung Hee University School of Medicine) ;
  • Yeom, Mi-Jung (Acupuncture and Meridian Science Research Center, College of Oriental Medicine, Kyung Hee University) ;
  • Shim, In-Sop (Acupuncture and Meridian Science Research Center, College of Oriental Medicine, Kyung Hee University) ;
  • Lee, Hye-Jung (Acupuncture and Meridian Science Research Center, College of Oriental Medicine, Kyung Hee University) ;
  • Hahm, Dae-Hyun (Acupuncture and Meridian Science Research Center, College of Oriental Medicine, Kyung Hee University)
  • Received : 2012.01.16
  • Accepted : 2012.05.29
  • Published : 2012.08.31

Abstract

The purpose of this study was to examine whether Phellodendri Cortex extract (PCE) could improve learning and memory impairments caused by lipopolysaccharide (LPS)-induced inflammation in the rat brain. The effect of PCE on modulating pro-inflammatory mediators in the hippocampus and its underlying mechanism were investigated. Injection of LPS into the lateral ventricle caused acute regional inflammation and subsequent deficits in spatial learning ability in the rats. Daily administration of PCE (50, 100, and 200 mg/kg, i.p.) for 21 days markedly improved the LPS-induced learning and memory disabilities in the Morris water maze and passive avoidance test. PCE administration significantly decreased the expression of pro-inflammatory mediators such as tumor necrosis factor-${\alpha}$, interleukin-$1{\beta}$, and cyclooxygenase-2 mRNA in the hippocampus, as assessed by RT-PCR analysis and immunohistochemistry. Together, these findings suggest that PCE significantly attenuated LPS-induced spatial cognitive impairment through inhibiting the expression of pro-inflammatory mediators in the rat brain. These results suggested that PCE may be effective in preventing or slowing the development of neurological disorders, including Alzheimer's disease, by improving cognitive and memory function because of its anti-inflammation activity in the brain.

Keywords

References

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