Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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A Study on the Mechanisms by Which the Aqueous Extract of Inonotus obliquus Induces Apoptosis and Inhibits Proliferation in HT-29 Human Colon Cancer Cells

차가버섯 물추출물의 대장암세포 증식억제 및 Apoptosis 유도기전 연구

  • 김은지 (한림대학교 실버생물산업기술연구센터) ;
  • 이용진 ((재)춘천바이오산업진흥원) ;
  • 신현경 (한림대학교 실버생물산업기술연구센터) ;
  • 윤정한 (한림대학교 실버생물산업기술연구센터)
  • Published : 2006.06.01
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Abstract

The mushroom Inonotus obliquue (IO) has been traditionally used for the treatment of gastrointestinal cancer in Russia, Poland, and most of Baltic countries. To explore the possibility that IO has chemoprevention effects, we examined whether or not the aqueous extract of IO inhibits HT-29 cell growth and investigated tile mechanism for this effect. Cells were incubated in the presence of increasing concentrations of the aqueous extract of IO. The extract substantially inhibited the viable HT-29 cell number in a dose-dependent manner and inhibited 5-bromo-2'-deoxyuridine incorporation into DNA of HT-29 cells. Annexin-V staining followed by flow cytometry revealed that the extract induced apoptosis of HT-29 cells in a dose-dependent manner. Western blot analysis of total cell lysates revealed that the extract induced cleavage of caspase-8, -9 and -3 and poly (ADP-ribose) polymerase, but did not affect the protein levels of Bax and Bcl-2. In addition, the extract dose-dependently increased the activity of caspase-8, -9 and -3. We have demonstrated that the aqueous extract of IO inhibits cell proliferation and induces apoptosis in HT-29 cells, which may be mediated by its ability to activate the caspase pathway.

차가버섯(Inonotus obliquus)은 한랭한 삼림지대에서 자라는 자작나무에 자생하는 버섯으로, 항종양 및 항돌연변이 활성이 있는 것으로 보고되고 있으나, 차가버섯의 항암기전에 대해 밝혀진 바가 없어, 본 연구에서는 인체의 대장암에서 유래한 HT-29 세포를 사용하여 차가버섯 물추출물의 대장암세포 증식 억제기전을 밝히고자 하였다. 차가버섯을 열수추출하여 냉동 건조하여 얻은 물추출물을 HT-29 세포 배양액에 여러 농도($0{\sim}100{\mu}g/mL$)로 첨가하여 세포의 증식에 미치는 영향을 조사하였다. 세포의 증식은 차가버섯 추출물 농도가 증가할수록 현저히 감소하였다. 차가버섯 물추출물 처리 농도에 비례하여 세포의 DNA합성은 감소하였고, apoptotic cell의 수는 현저히 증가하였다. Apoptosis의 주요한 조절 인자인 Bcl-2 family 단백질 수준은 차가버섯에 의해 변화하지 않았으나, cleaved caspase-8, -9, -3의 단백질 수준은 차가버섯에 의해 증가하였다. Caspase-8, -9, -3의 활성도 모두 차가버섯에 의해 유의적으로 증가하였다. Caspase-3의 표적 단백질로 세포의 생존에 결정적인 역할을 하는 PARP단백질의 분해도 차가버섯에 의해 현저히 증가하였다. 이 결과로부터 차가버섯 물추출물이 DNA합성을 억제하고 apoptosis를 유도하여 대장암 세포의 증식을 억제하고, caspase 경로의 활성을 증가하므로써 apoptosis를 유도한다는 결론을 내릴 수 있다. 또한 이 결과는 차가버섯 물추출물을 대장암의 예방이나 치료에 사용할 수 있는 가능성을 제시한다.

Keywords

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