Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Inhibitory Effects of Extracts from Albizzia julibrissin on Gonadal Maturation in a Medaka (Oryzias latipes)

자귀나무 추출물이 송사리(Oryzias latipes) 생식소 성숙에 대한 억제효과

  • Lee, Eun-Hee (Department of Molecular Biology, Dong-eui University) ;
  • Oh, Sang-Pil (Division of Export promotion, Jeju Special Self-Governing Province) ;
  • Kim, Myong-Hee (Department of Molecular Biology, Dong-eui University) ;
  • Kim, Kwang-Hyun (Department of Life Science and Biotechnology, Dong-eui University) ;
  • Hong, Sang-Hoon (Department of Oriental Medicine, Dong-eui University) ;
  • Han, Chang-Hee (Department of Molecular Biology, Dong-eui University)
  • Received : 2013.01.09
  • Accepted : 2013.03.25
  • Published : 2013.03.30
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Abstract

This study was performed to determine whether stem bark extract containing saponin of Albizzia julibrissin in the diet influences gonadal maturation and spawning in medaka (Oryzias latipes). The crude extraction containing saponin (HaBC) was partially purified from n-BuOH extraction of A. julibrissin stem bark by Diaion HP-20, Silica gel and Sephadex LH-20 chromatographies. We fed diets supplemented with HaBC to medaka. We then studied the effects of the HaBC supplement on the suppression of gonadal maturation and spawning in female medaka that were reared in aquaria with recirculation systems. In the experiment with immature female medaka, the periods of initiation of gonadal maturation and spawning were delayed in the fish that were fed diets supplemented with at least HaBC 20 mg/g-feed. In the experiment with mature female medaka, the fish that were fed diets supplemented with at least HaBC 20 mg/g-feed had lower GSIs than the control diet group did. The results showed that the growth of the immature medaka was not correlated with the amount of supplementation of HaBC in the diet. However, the condition factors (CF) in the medaka that were fed diets supplemented with at least HaBC 20 mg/g-feed were higher than in the medaka fed on the control diet. We concluded that extracts containing saponin from the stem bark of A. julibrissin have the potential to inhibit gonadal maturation in female medaka, but they did not act as growth stimulation. Further studies are required to determine the mechanism of the action.

사료에 첨가된 saponin이 함유된 자귀나무(Albizzia julibrissin) 껍질 추출물이 송사리(Oryzias latipes)의 생식소 성숙과 산란에 미치는 영향을 조사하기 위하여 자귀나무(A. julibrissin) 껍질의 n-BuOH 추출물로부터 Diaion HP-20, Silica gel과 Sephadex LH-20 chromatography들을 이용하여 조 사포닌 분획물(HaBC)을 분리하였다. 실험 어류들은 순환여과 장치 시스템의 수조에서 사육하였으며, HaBC를 첨가한 사료를 급여하여 암컷의 생식소 성숙 억제 및 산란 억제 효과를 조사하였다. 미성숙 송사리들에 대한 실험에서 사료에 HaBC를 20 mg/g-feed 이상 첨가한 사료를 먹인 어류들은 생식소의 성숙과 산란을 개시하는 시기가 지연되었다. 또한 성숙한 암컷 송사리들도 HaBC를 20 mg/g-feed 이상 첨가한 사료를 먹었을 때 대조구에 비해 낮은 GSI 값을 보였다. 미성숙한 송사리에 대한 길이 성장이나 체중에 대한 변화는 HaBC의 첨가량에 관계가 없었으나, 비만도(CF)에서는 HaBC를 첨가한 사료를 먹인 어류들이 대조구에 비해 높은 값을 보였다. 이러한 결과로 자귀나무(A. julibrissin)의 껍질로부터 분리한 saponin 분획물은 송사리 암컷의 성숙을 억제할 수 있었지만, 성장 촉진에는 아무런 작용을 하지 않았다. 이들 작용 기전에 대해서는 더 많은 연구들이 있어야 할 것이다.

Keywords

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