Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Growth Inhibition of Human Hepatoma and Bladder Carcinoma Cells by DNA Topoisomerae Inhibitor β-lapachone

DNA topoisomerase 억제제인 β-lapachone에 의한 인체 간암 및 방광암세포 증식억제에 관한 연구

  • Choi Da Yean (R&E Program, Busan Science Academy) ;
  • Lee Jae Il (R&E Program, Busan Science Academy) ;
  • Chung Hyun Sup (R&E Program, Busan Science Academy) ;
  • Seo Han Gyeol (R&E Program, Busan Science Academy) ;
  • Woo Hyun Joo (Department of Biochemistry, Dongeui University College of Oriental Medicine Busan) ;
  • Choi Yung Hyun (Department of Biochemistry, Dongeui University College of Oriental Medicine Busan)
  • 최다연 (부산과학고등학교) ;
  • 이재일 (부산과학고등학교) ;
  • 정협섭 (부산과학고등학교) ;
  • 서한결 (부산과학고등학교) ;
  • 우현주 (동의대학교 한의과대학 생화학교실) ;
  • 최영현 (동의대학교 한의과대학 생화학교실)
  • Published : 2005.06.01
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Abstract

The objective of the present study was to investigate the effect of $\beta-lapachone$, a quinone obtained from the bark of the lapacho tree (Tabebuia avellanedae) in South America, on the cell growth of human hepatoma (HepG2) and bladder (T24) carcinoma cells. Exposure of cancer cells to $\beta-lapachone$ resulted in growth inhibition, morphological changes and apoptosis in a concentration-dependent manner, which could be proved by MTT assay and flow cytometry analysis. Reverse transcription-polymerase chain reaction (RT-PCR) and Western blot analyses revealed that $\beta-lapachone$ did not affect the levels of tumor suppressor p53 and cyclin-dependent kinase (Cdk) inhibitor p21 (WAFl/CIPl) expression. However, the transcriptional factor Sp-l and proliferating cell nuclear antigen (PCNA) protein levels were significantly down-regulated by $\beta-lapachone$ in both cell lines. Moreover, $\beta-lapachone$ treatment caused a dose-dependent inhibition of the expression of telomere regulatory gene products such as human telomere reverse transcriptase (hTERT) and telomerase-associated protein-l (TEP-l). Taken together, these findings suggest that $\beta-lapachone$-induced inhibition of human hepatoma and bladder carcinoma cell proliferation is associated with the induction of apoptotic cell death via modulation of several major growth regulatory gene products, and provide important new insights into the additional mechanisms of the anti-cancer activity of $\beta-lapachone$.

남미지역에서 자생하는 Tabebuia avellanedae라는 나무의 수피에서 동정된 quinone계 물질이며, DNA topoisomeras억제제로 알려진 $\beta-lapachone$의 항암작용에 관한 부가적인 자료를 얻기 위하여 인체 간암(HepG2) 및 방광암(T24)세포를 대상으로 조사한 결과 다음과 같은 결과를 얻게 되었다. MTT assay 및 flow cytometry 분석 등의 결과에서, $\beta-lapachone$의 처리에 따라 조사된 두 가지 암세포에서 $\beta-lapachone$처리 농도의존적으로 암세포의 심한 형태적 변형이 동반되면서 암세포의 증식이 억제되었으며, 생존율이 저하되었고 이는 apoptosis유발과 상관성이 있음을 알 수 있었다. $\beta-lapachone$처리에 의한 두 암세포의 증식억제는 종양억제 유전자 p53 및 Cdk inhibitor p21의 발현과는 큰 연관성이 없음을 RT-PCR 및 Western blot analysis를 통하여 확인하였다. 그러나 전사조절인자 Sp-1 및 세포증식 주요조절인자인 PCNA의 단백질 발현은 $\beta-lapachone$처리에 따라 매우 감소되었으며, telomere조절에 중요한 인자들의 선택적 발현 저하 현상도 관찰되었다. 이상의 결과들은 인체 암세포에서 $\beta-lapachone$의 항암작용을 이해하는 중요한 자료가 될 것이며, $\beta-lapachone$과 유사한 화학적 구조 및 성질을 가지는 항암제 후보물질들의 항암기전 비교 및 항암제 개발을 위한 기초 자료로서 응용될 것이다.

Keywords

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