Effect of Polygala tenuifolia root extract on scopolamine-induced impairment of rat spatial cognition in an eight-arm radial maze task

Xiu Lan Sun, Hideyuki Ito, Takayoshi Masuoka, Chiaki Kamei, Tsutomu Hatano

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

The effects of Polygala tenuifolia root fractions and the acyl groups of its constituents on the retrieval process of spatial cognition in rats were studied using an eight-arm radial maze task. Oral administration of a precipitate fraction (PTB) obtained by concentration of the n-BuOH-soluble portion from the extract of the roots significantly decreased the number of total errors (TEs) and that of working memory errors (WMEs) at doses of 100 mg/kg and 200 mg/kg. However, it caused no significant decrease in the number of reference memory errors (RMEs). In addition, the saponin-rich fraction (PTBM) obtained by purification of PTB also showed significant decreases in TEs and WMEs at a dose of 100 mg/kg. Among the cinnamic acid derivatives present as the acyl groups in the P. tenuifolia constituents, sinapic acid (SNPA) significantly decreased TEs and WMEs at doses of 10 to 100 mg/kg. These results indicated that P. tenuifolia extracts, PTB and PTBM, and SNPA had a beneficial effect on the memory impairment induced by dysfunction of the cholinergic system in the brain. The memory improvement in the scopolamine-induced memory impairment seen in the radial maze performance was due to improvement in the short-term memory. A contribution of some constituents other than SNPA to the memory improvement was also suggested.

Original languageEnglish
Pages (from-to)1727-1731
Number of pages5
JournalBiological and Pharmaceutical Bulletin
Volume30
Issue number9
DOIs
Publication statusPublished - Sep 2007

Keywords

  • Eight-arm radial maze task
  • Polygala tenuifolia
  • Saponin
  • Sinapic acid
  • Spatial cognition

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science

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