Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Rehmannia glutinosa Ameliorates Scopolamine-Induced Learning and Memory Impairment in Rats

  • Lee, Bom-Bi (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 : 2011.04.11
  • Accepted : 2011.05.10
  • Published : 2011.08.28
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Abstract

Many studies have shown that the steamed root of Rehmannia glutinosa (SRG), which is widely used in the treatment of various neurodegenerative diseases in the context of Korean traditional medicine, is effective for improving cognitive and memory impairments. The purpose of this study was to examine whether SRG extracts improved memory defects caused by administering scopolamine (SCO) into the brains of rats. The effects of SRG on the acetylcholinergic system and proinflammatory cytokines in the hippocampus were also investigated. Male rats were administered daily doses of SRG (50, 100, and 200 mg/kg, i.p.) for 14 days, 1 h before scopolamine injection (2 mg/kg, i.p.). After inducing cognitive impairment via scopolamine administration, we conducted a passive avoidance test (PAT) and the Morris water maze (MWM) test as behavioral assessments. Changes in cholinergic system reactivity were also examined by measuring the immunoreactive neurons of choline acetyltransferase (ChAT) and the reactivity of acetylcholinesterase (AchE) in the hippocampus. Daily administration of SRG improved memory impairment according to the PAT, and reduced the escape latency for finding the platform in the MWM. The administration of SRG consistently significantly alleviated memory-associated decreases in cholinergic immunoreactivity and decreased interleukin-$1{\beta}$ (IL-$1{\beta}$) and tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$) mRNA expression in the hippocampus. The results demonstrated that SRG had a significant neuroprotective effect against the neuronal impairment and memory dysfunction caused by scopolamine in rats. These results suggest that SRG may be useful for improving cognitive functioning by stimulating cholinergic enzyme activities and alleviating inflammatory responses.

Keywords

References

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