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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Inhibitory Effects of Flavonoids on Growth of HT-29 Human Colon Cancer Cells

Flavonoid의 HT-29 대장암세포 증식 억제 효과

  • Cho, Young (Department of Home Economics, Korea National Open University) ;
  • Choi, Mi-Yong (Department of Home Economics, Korea National Open University)
  • 조영 (한국방송통신대학교 가정학과) ;
  • 최미용 (한국방송통신대학교 가정학과)
  • Received : 2014.10.13
  • Accepted : 2015.01.29
  • Published : 2015.03.31
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Abstract

This study was performed to elucidate the anti-proliferative and apoptotic mechanism of flavonoids in HT-29 human colon cancer cells. We investigated the anti-proliferative activity of flavonoids in HT-29 human colon cancer cells via cell viability assay (MTT assay), caspase-3 activity, RT-PCR, and western blotting. We cultured HT-29 cells in the presence of various flavonoids (apigenin, rutin, naringenin, and myricetin) at a concentration of $100{\mu}M$. In the MTT assay, naringenin showed the strongest effect on cell viability in HT-29 colon cancer cells. Caspase-3 activity, a marker of apoptosis, significantly increased upon naringenin treatment. For RT-PCR, myricetin significantly increased Bax protein levels, naringenin increased p53 protein levels, and rutin reduced expression of the anti-apoptotic protein Bcl-2. Western blotting of HT-29 colon cancer cells showed that myricetin increased cleaved caspase-3 protein levels, naringenin significantly increased poly (ADP-ribose) polymerase protein levels, and rutin increased E-cadherin protein levels. These results indicate that flavonoid exerts anticancer effects on human colon HT-29 cells through a caspase-dependent apoptotic pathway.

본 연구에서는 최근 식생활의 서구화로 인해 발병률이 급증하고 있는 대장암의 진행을 억제하거나 감소시키고 인체 대장암 세포인 HT-29의 증식을 억제하며, 세포사멸을 유도하는 천연소재를 알아보기 위해서 flavonoid가 HT-29 인체 대장암 세포의 apoptosis 유도 및 기전에 미치는 영향을 알아보았다. MTT assay 결과 apigenin, rutin, naringenin, myricetin을 $100{\mu}M$ 농도로 처리하였을 때 62.71, 75.78, 74.24, 77.61%로 이 중 naringenin이 대장암 세포 성장에 억제 효과가 가장 높은 실험 결과를 나타내었다. Caspase-3 activity에서는 naringenin이 241.46%로 가장 높은 활성을 나타내었다. 이를 바탕으로 세포사멸과 관련된 유전자를 확인하고자 대장암 세포에 flavonoid인 apigenin, rutin, naringenin, myricetin에 $100{\mu}M$ 농도로 처리한 후 RTPCR을 실시한 결과, 세포사멸의 주요한 조절인자인 Bcl-2 family 단백질 중 Bcl-2는 rutin에 의해 감소되었고 Bax는 myricetin에 의해 증가하였으며, p53은 naringenin이 높게 발현되었다. 또한 western blotting을 통해 flavonoid인 apigenin, rutin, naringenin, myricetin에 $100{\mu}M$ 농도로 처리한 결과, Bcl-2 family 단백질과 더불어 세포사멸 조절에 중요한 역할을 하는 활성형인 cleaved caspase-3은 모두 증가하였고, 그중 myricetin이, PARP은 naringenin, E-cadherin은 rutin이 각각 높은 발현 양상을 나타내었다. 이번 실험 결과를 통해 flavonoid가 세포사멸의 주요한 조절 인자인 Bcl-2 family 단백질의 발현이나 caspase의 활성 등을 조절하여 암세포 사멸인자인 Bcl-2의 발현은 감소시키고 Bax, p53, PARP의 발현을 증가시키는 것을 통해 대장암 세포의 apoptosis를 유도하였다. 또한 암세포의 전이와 관련된 E-cadherin의 발현도 조절하는 것을 관찰하였다. 이상의 연구를 통해 flavonoid가 대장암 세포의 증식을 억제하는 효과가 있음을 확인하였으며, 세포사멸과 관련된 기전을 규명하였다. 이를 기초자료로 일상에서 쉽게 섭취할 수 있는 식품에 많이 존재하며 비교적 독성과 부작용이 적은 flavonoid를 이용한 천연 항암제 개발 가능성을 제시하였고, 추후 대장암의 암예방제 및 암치료제로 개발될 수 있도록 추가 연구 수행이 필요할 것으로 사료된다.

Keywords

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