title: Radix Angelica Sinensis extracts ameliorate scopolamine- and cycloheximide-induced amnesia, but not p-chloroamphetamine-induced amnesia in rats.
abstract: The effects of the methanolic extract of Radix Angelica Sinensis (Umbellifera) (abbreviated as RAS extract) and n-hexane fraction of RAS extract (RAS(H) fraction) on the various drugs-induced amnesia in rats were studied by using passive avoidance task. RAS extract (1 g/kg) significantly prolonged the shortened step-through latency induced by SCOP and CXM, but not PCA. Furthermore, RAS(H) fraction (1 g/kg) also significantly prolonged the shortened step-through latency induced by SCOP and CXM but not PCA. RAS extract at any dose alone did not influence the step-through latency in the training trial produced by non-shocked rats, but it plus PCA prolonged the latency compared with PCA alone. However, RAS(H) fraction (1 g/kg) prolonged the latency in the training trial produced by non-shocked rats, but it plus any induced drugs did not differ from any induced drugs alone. These results suggest that the attenuating effects of RAS extract on the various drugs-induced amnesia were related to the memory processes. n-Hexane fraction of RAS extract might be one of the active fractions of RAS extract in the treatment of amnesia.
authors.affiliation: Institute of Chinese Pharmaceutical Sciences, China Medical College, Taichung, Taiwan.
authors.forename: M T
authors.initials: MT
authors.lastname: Hsieh
authors.forename: Y T
authors.initials: YT
authors.lastname: Lin
authors.forename: Y H
authors.initials: YH
authors.lastname: Lin
authors.forename: C R
authors.initials: CR
authors.lastname: Wu
mesh_terms: D000647:Amnesia / Q000139:chemically induced / Q000517:prevention & control*; D000818:Animals; D019661:Apiaceae; D001522:Behavior, Animal / Q000187:drug effects; D003513:Cycloheximide / Q000633:toxicity; D004195:Disease Models, Animal; D004365:Drugs, Chinese Herbal / Q000494:pharmacology* / Q000627:therapeutic use*; D008297:Male; D010936:Plant Extracts / Q000494:pharmacology / Q000627:therapeutic use; D051381:Rats; D017207:Rats, Sprague-Dawley; D012601:Scopolamine / Q000633:toxicity; D010133:p-Chloroamphetamine / Q000633:toxicity
chemical_list: D004365:Drugs, Chinese Herbal; D010936:Plant Extracts; D010133:p-Chloroamphetamine; D003513:Cycloheximide; D012601:Scopolamine