Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Analysis of Differentially Expressed Genes by Sulindac Sulfide in Human Colorectal Cells

인간 대장암 세포주에서 sulindac sulfide 처리에 의해 차별적으로 발현되는 유전자 군의 분석

  • Shin, Seung-Hwa (Dept. of Biological Sciences, Andong National University) ;
  • Kim, Jong-Sik (Dept. of Biological Sciences, Andong National University)
  • 신승화 (안동대학교 자연과학대학 생명과학과) ;
  • 김종식 (안동대학교 자연과학대학 생명과학과)
  • Published : 2007.07.30
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Abstract

To investigate whether sulindac, sulindac sulfone, and sulindac sulfide could affect cancer cell viabilities, human colorectal HCTl16 cells were treated with 10 ${\mu}M$ of each NSAID. Among treated NSAms, sulindac sulfide dramatically decreased the cell viabilities detected by MTS and the cytotoxic effect showed dose-dependent manner. To understand the molecular mechanism of cell death in response to sulindac sulfide treatment, we performed oligo DNA microarray analysis. We found that 23 genes were up-regulated more than 2 folds, whereas 33 genes were down-regulated more than 2 folds by treatment of 10 ${\mu}M$ sulindac sulfide. Among the up-regulated genes, we selected 3 genes (NAG-1, DDIT3, PCK2) and performed RT-PCR and quantitative real-time PCR to cofirm microarray data. The results of RT-PCR and real-time PCR were highly accorded with those of microarray experiment. As NAG-1 is well-known gene as tumor suppressor, we detected changes of NAG-1 expression by 10 ${\mu}M$ of sulindac, sulindac sulfone, and sulindac sulfide. The results of RT-PCR and quantitacve real-time PCR indicated that sulindac sulfide was the strongest inducer of NAG-1 among treated NSAIDS. This result implies that induction of NAG-1 by sulindac sulfide plays important role in cell death of colorectal cancer. Overall, we speculate that these results may be helpful in understanding the molecular mechanism of the cancer chemoprevention by sulindac sulfide in human colorectal cancer.

본 연구에서는 NSAID계 약물인 sulindac, sulindac sulfone, 그리고 sulindac sulfide 처리에 의한 암세포 생존율에 미치는 영향을 확인하기 위하여, 인간 대장암 세포주인 HCTl16에 각각 10 ${\mu}M$의 NSAID들을 처리하였다. 처리한약물 중 sulindac sulfide에 의한 암세포 생존율이 가장 높게 감소하는 것으로 MTS assay 결과 확인되었다. 또한 sulindac sulfide의 처리 농도가 증가됨에 따라 세포 생존율이 감소하는 것으로 확인되었다. Sulindac sulfide의 처리에 따른 이러한 암 세포 사멸의 분자생물학적 기전을 이해하기 위하여, oligo DNA microarray 실험을 수행하였다. 그 결과, 10 ${\mu}M$의 sulindac sulfide의 처리에 의해 2배 이상 발현이 증가되는 유전자가 23개 확인되었고, 반대로 2배 이상 발현이 감소되는 유전자가 33개 확인되었다. 증가되는 유전자중 3개(NAG-1, DDIT3, PCK2)를 선택하여, RT-PCR과 real-time PCR을 수행하였다. 그 결과 두 실험 모두 DNA microarray 실험결과와 동일하게 발현이 증가되었다. 이 중 sulindac, sulindac sulfone, sulindac sulfide에 의 한 NAG-1 유전자의 발현변화를 RT-PCR과 real-time PCR 방법으로 확인한 결과, sulindac sulfide에 의한 암 억제유전자인 NAG-1의 발현이 가장 많이 발현되었다. 이러한 연구결과는 세포생존율 결과와 비교하였을 때, NAG-1의 높은 발현과 암 세포 생존율의 감소가 관련이 있음을 간접적으로 시사한다. 따라서 이들 연구결과는 sulindac sulfide에 의한 화학적 암 예방법의 분자생물학적 기전을 이해하는데 도움을 줄 것으로 생각한다.

Keywords

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