Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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The Caudal-Related Homeodomain Proteins Upregulate catalase Expression in Drosophila Hindgut and Human Colorectal Carcinoma Cells

초파리 대장조직과 인간 대장암세포주에서의 caudal 단백질에 의한 catalase 발현 조절

  • Park, Jae-Hong (Department of Molecular Biology, Pusan National University) ;
  • Park, So-Young (Department of Molecular Biology, Pusan National University) ;
  • Lee, Dong-Ho (Department of Molecular Biology, Pusan National University) ;
  • Kim, Young-Shin (Department of Research Institute of Genetic Engineering, Pusan National University) ;
  • Yoo, Mi-Ae (Department of Molecular Biology, Pusan National University)
  • 박재홍 (부산대학교 분자생물학과) ;
  • 박소영 (부산대학교 분자생물학과) ;
  • 이동호 (부산대학교 분자생물학과) ;
  • 김영신 (부산대학교 유전공학연구소) ;
  • 유미애 (부산대학교 분자생물학과)
  • Received : 2010.12.07
  • Accepted : 2011.01.04
  • Published : 2011.02.28
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Abstract

Caudal-related homeodomain proteins play critical roles in intestine development and maintenance from Drosophila to humans. The loss or reduction of CDX1 and CDX2 are known to be associated with colon cancers. It has been well known that colorectal carcinogenesis is associated with serious oxidative stress and that catalase is decreased in colon carcinomas. However, the underlying molecular mechanisms remain elusive. Here, we report that Caudal-related homeodomain proteins positively regulate catalase expression in both Drosophila and humans. We found that Drosophila caudal heterozygotes have a decreased catalase expression and increased ROS generation in the hindgut, and that the overexpression of Caudal increases catalase promoter activity and catalase mRNA levels. We also found that CDX1 and CDX2 up-regulate catalase promoter activity and protein levels in HCT116 cells - human colorectal carcinoma cell lines. The level of catalase protein in several colorectal carcinoma cell lines was associated with CDX1 expression. These results suggest that CDX1 and CDX2 may be involved in intestinal homeostasis and tumorigenesis via regulation of catalase expression.

Caudal homeodomain 단백질은 초파리에서 사람에 이르기까지 보존되어 있으며, 장조직의 발생과 유지에 필수적인 역할을 한다. CDX1과 CDX2의 발현 감소 혹은 소실이 대장암과 연관되어 있음이 잘 알려져 있다. 대장암 발생은 산화성 스트레스와 밀접한 관련이 있으며, 대장암 조직에서 항산화효소인 catalase의 발현이 감소되어 있다. 하지만 그 분자적 기전은 잘 밝혀져 있지 않다. 본 연구에서는 초파리와 사람의 caudal homeodomain 단백질들이 catalase의 발현을 조절하는 것을 보여준다. 초파리 caudal heterozygous 돌연변이체의 대장조직에서 catalase의 발현이 감소되어 있고 ROS 생성이 증가되어 있음을 관찰하였다. 그리고 caudal 유전자의 과발현에 의해 catalase promoter의 활성과 mRNA 수준이 각각 증가함을 확인하였다. 또한 사람의 대장암 세포주인 HCT116 세포에서 CDX1과 CDX2가 catalase promoter의 활성과 단백질 수준에서 catalase를 상향 조절함을 관찰하였다. 이러한 결과들은 CDX1과 CDX2가 catalase 발현 조절을 통하여 장의 항상성 유지와 암발생 과정에 관여함을 시사한다.

Keywords

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