Paeoniflorin ameliorates acquisition impairment of a simple operant discrimination performance caused by unilateral nucleus basalis magnocellularis lesion in rats

The effect of paeoniflorin on learning impairment of operant brightness discrimination performance　was investigated in rats with unilateral nucleus basalis magnocellularis（NBM）lesion. The animals　with unilateral NBM lesion exhibited a significant acquisition impairment of brightness discrimination task during the early phase of a training period（1-5days after starting the training session). When　administered daily during a training period，paeoniflorin significantly improved the learning impairment　of unilateral NBM-lesioned rats at 0.01 but not 0.1mg／kg／day（p.o.）. Tacrine （0.3mg／kg／day，p.o.）， a　cholinesterase inhibitor，also significantly ameliorated the learning deficit. These results suggest that　paeoniflorin improves the impairment of non-spatial learning performance caused by cholinergic　dysfunction in rats and that it may have a beneficial effect on senile dementia

DNA array analysis of gene expression changes by Choto-san in the ischemic rat brain

The effects of Choto-san on gene expression in the dementia model rat brain were studied using a DNA microarray system. Choto-san inhibited the expression of 181 genes that has been enhanced by permanent occlusion of the bilateral common carotid arteries (2VO). Choto-san also reversed the expression inhibition of 32 genes induced by 2VO. These results may suggest that Choto-san, which has been therapeutically used as an antidementive drug, shows therapeutic effects through gene expression changes痴呆モデル動物である両側総頸動脈永久結紮ラット脳中での釣藤散による遺伝子発現変化をDNAマイクロアレイ法により検討した。被検4,277種の遺伝子中181種類の発現が脳虚血4日後の脳中で上昇し,釣藤散1g/kg 1日1回3日間経口投与により回復することが明らかとなった。また,32種類の発現が,脳虚血により減少し,釣藤散で回復することもわかった。この結果より,釣藤散は関連遺伝子の発現変化を介して抗痴呆効果をあらわしている可能性が考えられる

Protective effect of Choto-san and its related constituents on hydrogen peroxide-induced cell damage in NG108-15 cells

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