Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Dependency on p53 in Expression Changes of ATF3 and NAG-1 Induced by EGCG, Genistein, and Resveratrol

EGCG, genistein, resveratrol 처리에 의한 ATF3와 NAG-1 유전자 발현변화의 p53 의존성 분석

  • Kim, Min-Jeong (Department of Biological Sciences, Andong National University) ;
  • Kim, Hyun-Ji (Department of Biological Sciences, Andong National University) ;
  • Seo, Yu-Mi (Department of Biological Sciences, Andong National University) ;
  • Lee, Eun-Joo (Department of Biological Sciences, Andong National University) ;
  • Kim, Jong-Sik (Department of Biological Sciences, Andong National University)
  • 김민정 (국립안동대학교 생명과학과) ;
  • 김현지 (국립안동대학교 생명과학과) ;
  • 서유미 (국립안동대학교 생명과학과) ;
  • 이은주 (국립안동대학교 생명과학과) ;
  • 김종식 (국립안동대학교 생명과학과)
  • Received : 2017.11.08
  • Accepted : 2018.05.14
  • Published : 2018.05.30
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Abstract

Epigallocatechin-3-gallate (EGCG), one of catechins of green tea, has been known to possess anti-oxidation, anti-inflammation, and anti-cancer effects. The present study analyzed global gene expression changes in EGCG-treated HCT116 cells and p53-null HCT116 cells by oligo DNA microarray analysis. Among the differentially expressed genes in EGCG-treated HCT116 cells, four were selected that are known as tumor suppressor genes (activating transcription factor 3 [ATF3], cyclin dependent kinase inhibitor 1A [CDKN1A], DNA damage-inducible transcript 3 [DDIT3] and non-steroidal anti-inflammatory drug activated gene [NAG-1]) and their expression was compared to the expression of genes in p53-null HCT116 cells. We found that the expression of these genes was not dependent on their p53 status except for NAG-1, which was only up-regulated in HCT116. The results of RT-PCR and Western blot analysis showed that ATF3 up-regulation by EGCG was not affected by the presence of p53, whereas NAG-1 expression was not induced in p53-null HCT116 cells. We also detected ATF3 and NAG-1 expression changes through genistein and resveratrol treatment. Interestingly, genistein could not up-regulate ATF3 regardless of p53 status, but genistein could induce NAG-1 only in HCT116 cells. Resveratrol could significantly induce NAG-1 as well as ATF3 independent of p53 presence. These results indicate that EGCG, genistein and resveratrol may have different anti-cancer effects. Overall, the results of this study may help to increase our understandings of molecular mechanisms on anti-cancer activities mediated by EGCG, genistein and resveratrol in human colorectal cancer cells.

EGCG는 녹차의 카테킨 중의 하나로서 항산화, 항염증 그리고 항암 활성 등 다양한 생리활성을 가지고 있는 물질로 알려져 있다. 본 연구에서는 EGCG를 처리한 HCT116 세포와 p53-null HCT116 세포에서 oligo DNA microarray 실험을 통하여 유전자 발현 변화를 분석하였다. Microarray 실험에서 EGCG를 처리한 HCT116 세포주에서 증가된 유전자 4개(ATF3, CDKN1A, DDIT3, NAG-1)를 선별하여, p53-null HCT116에서의 데이터와 비교하였다. NAG-1을 제외한 3개의 유전자는 p53의 상태와 관계없이 발현이 증가하였고, p53-null HCT116 세포주에서는 EGCG에 의해 NAG-1의 발현이 증가되지 않았다. EGCG의 처리에 의해 ATF3와 NAG-1의 유전자와 단백질의 발현을 확인한 경우 동일한 결과를 보여주었다. 또한, 파이토케미칼 genistein과 resveratrol을 처리한 후 ATF3와 NAG-1의 발현을 연구한 결과 genistein은 p53의 상태와 관계없이 ATF3 발현에 영향을 주지 못하는 반면, NAG-1 단백질은 p53 존재 하에서만 발현이 증가되었다. 이에 반해 resveratrol은 p53의 상태와는 관계없이 ATF3와 NAG-1 단백질의 발현을 증가시켰다. 따라서, 항암 활성을 가진 3 종류의 파이토케미칼이 각각 다른 기전으로 항암 유전자를 발현시키는 것으로 생각된다. 종합적으로 본 연구결과는 파이토케미칼 EGCG, genistein, resveratrol에 의해 매개되는 항암 활성의 기전을 이해하는데 도움을 줄 것으로 생각된다.

Keywords

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