Induction of Apoptosis by Ursolic Acid in F9 Teratocarcinoma Cells

F9 기형암종세포에서 Ursolic acid의 apoptosis 유도기작

  • 강창모 (부산대학교 생물학과) ;
  • 백진현 (부산대학교 분자생물학과) ;
  • 김규원 (부산대학교 분자생물학과)
  • Published : 1998.02.01

Abstract

The apoptosis-inducing activity of ursolic acid (UA) was examined in mouse F9 teratocarcinoma cells on the bases of biochemical and morphological characteeristics. UA, pentacyclic trierpene acid, exhibits antitumor activities including inhibition of skin tumorigenesis, induction of tumor cell differentiation and antitumor promotion. Treatment with UA showed that the decrease of cell viability was dose-dependent. UA also induced genomic DNA fragmetation, a hallmark of apoptosis, indicating that the mechanism of UA-induced F9 cell death was through apoptosis. When the morphology of the F9 cells was examined by electron microscopy, the cells treated with UA showed the charcteristic morphological features of apoptosis such as chromatin condensation and nuclear fragmentation. DNA fragmentations by UA were inhibired by cycloheximide, which suggest that de novo protein synthesis was required for DNA fragmentation by UA. Inaddition, the expression of c-jun was increased, but those of c-myc and laminin B1 were decreased during apoptosis induced by UA in F9 cells. These results suggest that UA causes an apoptosis in F9 cells. Further, the increased expression of c-jun may be involved in the UA-induced apoptosis of f9 cells.

Ursolic acid(UA)의 apoptosis 유도능을 F9 생쥐 기형암종세포를 대상으로 조사하였다. UA는 피부암화의 억제, tumor의 분화유도, tumor promotion의 억제 등의 항암 효과를 나타내는 pentacyclic triterpene acid로 물질로 알려져 있다. UA를 F9세포에 처리하였을 때 농도비례로 성장억제를 나타냈다. 또한 apoptosis과정에서 관찰되는 전형적인 DNA 분절을 관찰할 수 있었고, 전자현미경을 이용한 세포의 미세구조를 관찰한 결과, 역시 apoptosis과정에서 관찰되는 전형적인 형태인 염색질 응축, 핵의 분절들을 관찰할 수 있어, UA에 의한 항암 효과는 apoptosis에 의한 것임을 시사한다. UA에 의한 apoptosis는 단백질 합성저해제인 cycloheximide에 의해 저해됨을 관찰할 수 있었다. UA를 F4쎄포에 처리한 후 oncogene의 발현양상을 조사한 결과, c-myc과 laminin B1은 apoptosis과정동안 점점 감소하고 c-jun은 증가함을 관찰할 수 있었다. 이상의 결과로서 UA에 의한 F9 세포의 apoptosis에는 새로운 단백질의 합성이 요구되며, c-myc 및 laminin의 발현 감소와 c-jumd의 발현 증가가 관여하고 있음을 시사한다.

Keywords

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