Relaxant effect induced by wogonin from Scutellaria baicalensis on rat isolated uterine smooth muscle

Huey Chuan Shih, Ling Ling Yang

研究成果: 雜誌貢獻文章同行評審

5 引文 斯高帕斯(Scopus)


Context: Wogonin is a flavone derivative isolated from Scutellaria baicalensis Georgi (Labiatae) root, which is a traditional Chinese drug used as an anti-inflammatory and for management of dysmenorrhea. Objective: The effect of wogonin on the uterus has not yet been examined. We investigated the relaxant effects of wogonin on contractile activity of isolated uterine strips of rats. Materials and methods: The effect of wogonin on spontaneous uterine contraction, and uterine contraction induced by agonists, K+-depolarization and oxytocin in Ca2+-free solution was observed. To clarify the type of potassium channel, we tested the effects of 4-aminopyridine, tetraethylammonium and glibenclamide. Results: Wogonin reduced the contractile amplitude of uterine strip smooth muscle of rats in a dose-dependent manner. The concentration of wogonin for reducing the contraction amplitude by 50% (IC50) on spontaneous contractions was 60.5 μM. Wogonin also inhibited the contraction induced by three agonists (oxytocin, prostaglandin F2α and acetylcholine). For the uterine strips pretreated with oxytocin in Ca 2+-free solution or K+-depolarization, wogonin showed relaxant effect on the induced uterine contractions. In addition, whereas the inhibitive effect of wogonin on the contraction of uterine smooth muscle in rats could be partly blocked by 4-aminopyridine and tetraethylammonium, it was not influenced by glibenclamide. Discussion and conclusion: Wogonin significantly inhibited the contraction of rat uterine smooth muscle probably through the inhibition of the inflow of extracellular calcium into cells via cell membrane, and intracellular release of calcium ions. In addition, the relaxant effect induced by wogonin might be due in part to the opening of voltage-dependent and large conductance Ca2-activated K+ channels.
頁(從 - 到)760-765
期刊Pharmaceutical Biology
出版狀態已發佈 - 六月 2012

ASJC Scopus subject areas

  • 藥物發現
  • 藥理
  • 藥學科學
  • 補充和替代醫學
  • 分子醫學


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