Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Anti-invasive Activity of Human Breast Carcinoma Cells by Genistein through Modulation of Tight Junction Function

인체유방암세포의 tight junction 기능 조절을 통한 genistein의 암세포 침윤 억제 효과

  • Kim, Sung-Ok (Department of Biomaterial Control (BK21 program), Graduate School, Dongeui University College of Oriental Medicine) ;
  • Jeang, Yang-Kee (Department of Biotechnology, College of Natural Resources and Life Science and BK21 Center for Silver-Bio Industrialization, Dong-A University) ;
  • Choi, Yung-Hyun (Department of Biomaterial Control (BK21 program), Graduate School, Dongeui University College of Oriental Medicine)
  • 김성옥 (동의대학교 대학원 바이오물질제어학과) ;
  • 정영기 (동아대학교 생명공학과) ;
  • 최영현 (동의대학교 대학원 바이오물질제어학과)
  • Published : 2009.09.30
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Abstract

Tight junctions (TJs) that act as paracellular permeability barriers play an essential role in regulating the diffusion of fluid, electrolytes and macromolecules through the paracellular pathway. In this study, we investigated the correlation between the tightening of TJs, permeability and the invasive activity of genistein - a bioactive isoflavone of soybeans - in human breast carcinoma MCF-7 and MDA-MB-231 cells. The inhibitory effects of genistein on cell proliferation, motility and invasiveness were found to be associated with the increased tightness of the TJs, which was demonstrated by an increase in transepithelial electrical resistance and a decrease in paracellular permeability. Additionally, the immunoblotting results indicated that genistein repressed the levels of the proteins that comprise the major components of TJ, claudin-3 and claudin-4, which play a key role in the control and selectivity of paracellular transport. Furthermore, genistein decreased the metastasis-related gene expressions of insulin like growth factor-1 receptor and snail, while concurrently increasing that of thrombospondin-1 and E-cadherin. In addition, we demonstrated that claudins play an important role in the anti-motility and invasiveness of genistein using claudin-3 small interfering RNA. Taken together, our results indicate a possible role for genistein as an inhibitor of cancer cell invasion through the tightening of TJs, which may counteract the up-regulation of claudins. In addition, our results indicate that this may be beneficial for the inhibition of tumor metastasis.

Tight junctions (TJs)은 인접된 세포 사이의 전해질 및 거대분자 확산 조절에 관여하는 paracellular permeability의 장벽 역할을 한다. 본 연구에서는 MCF-7 및 MDA-MB-231 인체유방암세포에서 대두의 대표적인 생리활성물인 genistein에 의한 암세포의 침윤 억제에서 TJs의 견고성 및 투과성과의 연관성을 조사하였다. 본 연구의 결과에 의하면 genistein에 의한 유방암세포의 증식 억제, 암세포 이동성의 저하 및 침윤성의 억제는 TJs의 증가된 견고성과 연관이 있었으며, 이를 transepithelial electrical resistance의 증가 및 paracellular permeability의 감소로 확인하였다. Genistein은 두 유방암세포에서 TJs의 주요 조절 단백질로서 paracellular transport 조절에 중요한 역할을 하는 claudin-3 및 claudin-4의 발현을 억제시켰다. 그리고 genistein은 암세포의 전이 조절 관련 유전자들인 like growth factor-1 receptor 및 snail의 발현을 억제하였으며, thrombospondin-1 및 E-cadherin의 발현은 증가시켰다. 또한 small interfering RNA를 이용하여 genistein의 유방암세포의 침윤 억제에서 claudin-3단백질의 중요성을 확인하였다. 결론적으로 genistein이 TJs의 견고성 증가를 통하여 암세포의 침윤성을 억제할 수 있었으며, 이 과정에서 아마도 claudin 단백질의 발현 증가가 중요한 역할을 하고 있음을 알 수 있었다. 본 연구의 결과는 genistein이 종양 전이억제를 효과적으로 차단할 수 있음을 보여주는 것이다.

Keywords

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