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Journal Article
Research Support, U.S. Gov't, P.H.S.
Anti-amnestic activity of E-p-methoxycinnamic acid from Scrophularia buergeriana.
Brain Research. Cognitive Brain Research 2003 July
We previously reported that phenylpropanoids isolated from the roots of Scrophularia buergeriana Miquel (Scrophulariaceae) protected cultured cortical neurons against glutamate-induced neurotoxicity [Kim and Kim, Phytochemistry, 54 (2000) 503-509; Kim et al., Br. J. Pharmacol. 135 (2002) 1281-1291]. In the present study, we examined the anti-amnestic activities of phenylpropanoids in mice with amnesia induced in vivo by scopolamine. Among the phenylpropanoids tested through passive avoidance tasks, buergeriside A1, buergeriside C1, E-p-methoxycinnamic acid (E-p-MCA) and E-isoferulic acid significantly improved the deficit of memory induced by scopolamine. This suggested that the alpha,beta-unsaturated carboxyl moiety and the para-methoxy group in phenylpropanoids (E-p-MCA) might be a crucial component in their cognition-enhancing activity. Indeed, E-p-MCA (0.01-2 mg/kg body weight, i.p.), given in pre- or post-treatment paradigms, significantly ameliorated scopolamine-induced amnesia as determined by passive avoidance tasks and prevented or aided in the recovery of memory to a level that was about 60% of control. In addition, E-p-MCA (0.1-1.0 mg/kg body weight, i.p.) significantly improved impairments of spatial learning and memory induced by scopolamine; the compound reduced deficits in both long- and short-term memories as measured by the Morris water maze test. We suggest, therefore, that E-p-MCA may ultimately hold significant therapeutic value in alleviating certain memory impairments observed in dementia.
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