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ω3-Polyunsaturated Fatty Acids-induced Inhibition of Tumorigenicity and Invasion by Suppression of COX-2/MMPs/VEGF through NF-kB in Colon Cancer Cells

오메가-3 지방산에 의한 COX-2/MMPs/VEGF 억제에 따른 대장암세포의 종양 형성 및 침윤 억제

  • Shin, Soyeon (Department of Biochemistry, Chungnam National University) ;
  • Kim, Yong-Jo (Department of Biochemistry, Chungnam National University) ;
  • Han, Seung-Hyeon (Department of Biochemistry, Chungnam National University) ;
  • Silwal, Prashanta (Department of Biochemistry, Chungnam National University) ;
  • Heo, Jun-Young (Department of Biochemistry, Chungnam National University) ;
  • Jeon, Young-Joo (Department of Biochemistry, Chungnam National University) ;
  • Park, Seung-Kiel (Department of Biochemistry, Chungnam National University) ;
  • Kweon, Gi-Ryang (Department of Biochemistry, Chungnam National University) ;
  • Park, Jong-Il (Department of Biochemistry, Chungnam National University) ;
  • Lim, Kyu (Department of Biochemistry, Chungnam National University)
  • 신소연 (충남대학교 의과대학 생화학교실) ;
  • 김용조 (충남대학교 의과대학 생화학교실) ;
  • 한승현 (충남대학교 의과대학 생화학교실) ;
  • 프라산타 (충남대학교 의과대학 생화학교실) ;
  • 허준영 (충남대학교 의과대학 생화학교실) ;
  • 전영주 (충남대학교 의과대학 생화학교실) ;
  • 박승길 (충남대학교 의과대학 생화학교실) ;
  • 권기량 (충남대학교 의과대학 생화학교실) ;
  • 박종일 (충남대학교 의과대학 생화학교실) ;
  • 임규 (충남대학교 의과대학 생화학교실)
  • Received : 2017.06.07
  • Accepted : 2017.07.24
  • Published : 2017.09.30

Abstract

Epidemiology studies have reported a reduced incidence of colon cancer among populations that consume a large quantity of ${\omega}3-polyunsaturated$ fatty acids (${\omega}3-PUFAs$) of marine origin. Herein, we demonstrated a mechanism of anticancer action of ${\omega}3-PUFAs$, showing that they suppressed invasion and tumorigenicity in colon cancer cells. Docosahexaenoic acids (DHA) inhibited the cell growth of HT29 cells. This action likely involved apoptosis, given that the DHA treatment increased the cleaved form of PARP and sub G1 cells. Moreover, the invasiveness of HT29 cells was inhibited following DHA treatment, whereas arachidonic acid (AA) had no effect. The levels of Matrix-metalloproteinase-9 (MMP-9) and MMP-2 mRNA decreased after DHA pretreatment. DHA treatment inhibited MMP-9 and MMP-2 promoter activities and reduced VEGF promoter activity. DHA pretreatment also inhibited the activities of prostaglandin-2 (PGE2)-induced MMPs and the VEGF promoter. Cyclooxygenase-2 (COX-2) overexpression increased the activity of MMPs and that of the Vascular endotherial growth factor (VEGF) promoter in HT29 cells, and DHA inhibited NF-kB and COX-2 promoter reporter activities. As shown by in vivo experiments, when mouse colon cancer cells (MCA38) were implanted into Fat-1 and wild-type mice, both the tumoral size and volume were dramatically inhibited in Fat-1 transgenic mice. Furthermore, TUNEL-positive cells increased in tumors from Fat-1 mice compared with wild mice. In immunohistochemistry, the intensity of CD31 in Fat-1 tumors was weaker. These findings suggest that ${\omega}3-PUFAs$ may inhibit tumorigenicity and angiogenesis as well as cancer cell invasion by suppression of COX-2, MMPs and VEGF via the reduction of NF-kB in colon cancer.

대장암은 미국 등 서양 국가뿐만 아니라 국내에서도 2번째로 많이 발병이 되는 암으로 알려져 있다. 역학조사에 의하면 오메가-3를 많이 섭취한 인종에서 대장암 발생빈도가 감소하고 최근 오메가-3는 수종의 암에 대해 항암작용을 나타낸다고 한다. 이에 본 연구에서는 대장암에서 DHA의 항침윤, 항혈관 신생 및 항종양 형성능 억제의 기전을 규명하여 다음과 같은 결과를 얻었다. DHA는 인체 대장암 세포주 HT29 의 증식을 농도 의존적으로 억제하였으나 AA는 거의 영향이 없었다. FACS 분석에서 DHA 처리했을 때 Sub G1 phase의 세포가 DHA의 농도 의존적으로 증가 하였다. DHA 처리 후 cleaved PARP가 증가하고, uncelaved caspase-3가 감소 하였다. HT29 세포의 침윤능은 DHA 처리에 의해 억제 되었다. DHA 처리 후 MMP-9 및 MMP-2 mRNA양이 감소 되었을 뿐만 아니라 그 promoter의 reporter 활성도 억제하였으며 VEGF promoter 활성도 DHA에 의해 억제 되었다. NF-kB promoter 활성 및 핵으로의 이동도 DHA에 의해 억제 되었다. In vivo 동물실험에서 생쥐 대장암 세포주인 MCA38에 대한 Fat-1 transgenic mice에서의 종양 형성능은 현저히 억제 되었다. 면역형광염색법을 이용한 Fat-1 transgenic mice의 종양 조직에서의 TUNEL 양성세포는 wild type mice에 비해 현저히 증가하였으나 CD31의 형광강도는 감소 되었다. 이상의 결과로 오메가-3는 대장암 세포에서 NF-kB 억제에 따른 COX-2, MMP-2 및 MMP-9 등 matrix matalloproteinase의 억제를 통한 침윤능의 억제, VEGF 억제를 통한 혈관신생의 억제등 복합적 기전에 의해 항암작용을 나타내리라 생각되며, 따라서 오메가-3는 대장암의 예방 및 치료에 유용하게 사용될 수 있으리라 생각된다.

Keywords

References

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