Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Inhibition of Apoptosis by Nitric Oxide in MCF-7 Cells

유방암 세포(MCF-7)에서 nitric oxide에 의한 apoptosis 억제

  • Kim, Kyun-Ha (Department of Biology, College of Natural Sciences, Pusan National University) ;
  • Roh, Sang-Geun (Department of Biology, College of Natural Sciences, Pusan National University) ;
  • Park, Hae-Ryun (Department of oral pathology, College of Dentistry, Pusan National University) ;
  • Choi, Won-Chul (Department of Biology, College of Natural Sciences, Pusan National University)
  • 김균하 (부산대학교 자연과학대학 생물학과) ;
  • 노상근 (부산대학교 자연과학대학 생물학과) ;
  • 박혜련 (부산대학교 치과대학 구강병리학) ;
  • 최원철 (부산대학교 자연과학대학 생물학과)
  • Published : 2009.02.28
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Abstract

Nitric oxide (NO) is a diffusible, multifunctional and transcellular messenger that has been implicated in numerous physiological and pathological conditions. It has been reported that NO induced apoptosis in tumor cells, macrophage cells and inhibited apoptosis in normal cells, endothelial cells. To examine whether NO could induce apoptosis in MCF-7 cells, cells were treated with SIN-1 (3-morpholinosydnonimine), NO donor. Cell viability did not change in SIN-1 treated cells for 48 h and there was no significantly changes in cell cycle progression or growth pattern by FACS analysis. But p53 protein, an apoptosis-related factor, increased SIN-1 treatment time dependently. Bcl-2, MDM2 and p21 were also accumulated. Bax level did not change. A major role of inhibiting apoptosis by NO in MCF-7 cells, cobalt chloride ($CoCl_2$) was added to cells preincubated with SIN-1. Whereas $CoCl_2$ treated cells underwent apoptosis, for 24 h SIN-1 preincubated cells were not induced apoptosis. Inactivated proteins, MDM2 and bcl-2, by $CoCl_2$ levels also increased in SIN-1 pre-treated cells. These results suggested that SIN-1 blocked p53 by MDM2 activation and inhibited apoptosis by inducing p21 and bcl-2 expression.

Nitric oxide (NO)는 세포 안의 다양한 생리학적, 병리학적 조건에서 확산, 세포 간 messenger와 같은 다양한 기능이 있으며, NO는 암세포나 macrophage 등과 같은 세포에서는 apoptosis를 유도하고, 정상세포나 내피 세포에서는 apoptosis를 억제한다고 보고되어져 있다. NO가 유방암 세포주인 MCF-7 세포에서는 apoptosis를 유도하는지 확인하기 위해 NO donor인 SIN-1을 처리하였다. SIN-1은 48시간 처리 시에도 세포 생존율에 영향을 주지 않았고, 세포주기나 성장 패턴에도 아무런 변화를 주지 않았다. 그러나 p53의 발현은 SIN-1 처리 시간에 따라 증가하였고, bcl-2, MDM2, p21의 발현도 함께 증가하였다. Bax의 발현은 SIN-1 처리 시에 변화가 없었다. MCF-7 세포에서 NO에 의한 apoptosis 억제를 보기 위하여, SIN-1을 선처리한 세포에 $CoCl_2$를 처리하였다. 세포에 $CoCl_2$ 만을 처리한 군에서는 확연한 apoptosis를 나타내었지만, SIN-1을 24 시간 선처리한 세포에서는 apoptosis를 관찰할 수 없었다. Cobalt Chloride에 의해 감소되었던 p53, MDM2, bcl-2 발현 역시 SIN-1을 24시간 선처리한 세포에서 증가하였다. 이런 결과들은 SIN-1에 의해 발현된 MDM2가 p53의 기능을 막으며, 또한 p21과 bcl-2의 발현이 유도되어 apoptosis를 억제함을 제시한다.

Keywords

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