Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Paclitaxel Induced Caspase-Independent Mitotic Catastrophe in Rabbit Articular Chondrocyte

Paclitaxel에 의한 관절연골 세포의 capase-비의존적 mitotic catastrophe 유도

  • Im, Jeong-Hee (Department of Biological Sciences, College of Natural Sciences, Kongju National University) ;
  • Kim, Song-Ja (Department of Biological Sciences, College of Natural Sciences, Kongju National University)
  • 임정희 (국립공주대학교 자연과학대학 생명과학과) ;
  • 김송자 (국립공주대학교 자연과학대학 생명과학과)
  • Received : 2010.01.06
  • Accepted : 2010.04.24
  • Published : 2010.04.30
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Abstract

Paclitaxel is known as a potent inhibitor of microtubule depolymerization. It leads to mitotic arrest and cell death by stabilizing the spindle in various cell types. Here, we investigated the effects of paclitaxel on the proliferation and cell death of rabbit articular chondrocytes. Paclitaxel inhibited proliferation in a dose- and time- dependent manner, determined by MTT assay in rabbit articular chondrocytes. We also established paclitaxel-induced G2/M arrest by fluorescent activated cell sorter (FACS) analysis. Paclitaxel increased expression of cyclin B, p53 and p21, while reducing expression of cdc2 and cdc25C in chondrocytes, as detected by Western blot analysis. Interestingly, paclitaxel showed the mitotic catastrophe that leads to abnormal nucleus division and cell death without DNA fragmentation through activation of caspase. Cell death by mitotic catastrophe in cells treated with paclitaxel was suppressed by inhibiting G1/S arrest with 2 mM thymidine. These results demonstrate that paclitaxel induces cell death via mitotic catastrophe without activation of casepase in rabbit articular chondrocytes.

Paclitaxel은 미세소관의 탈중합을 억제하는 시약으로 알려져 있다. Paclitaxel은 다양한 세포에서 세포 내 방추체를 안정화시킴으로써 유사분열 억제 및 세포사멸을 유도한다. 본 실험에서는 토끼 관절 연골세포에서 paclitaxel이 연골세포의 증식과 사멸에 미치는 효과에 대한 연구를 수행하였다. MTT assay를 수행한 결과 paclitaxel은 연골세포에서 농도 의존적으로 세포 증식을 억제한다는 것을 확인 할 수 있었으며, FACS analysis와 Western blot analysis를 수행한 결과, paclitaxel이 G2/M 정지를 유도하는 것을 확인하였다. 또한, paclitaxel이 비정상적인 세포 분열유도와 핵 단편분절 유도없이 일어나는 mitotic catastrophe 즉, caspase-3 비의존적인 세포사멸을 유도하였다. Paclitaxel을 처리한 세포에서 일어나는 이러한 mitotic catastrophe에 의한 세포 죽음은 G1/S기의 진행을 억제하는 시약인 thymidine을 처리하는 것에 의해 억제되는 것을 확인할 수 있었다. 이러한 결과를 종합해 볼 때, paclitaxel에 의한 토끼 관절 연골 세포에서의 세포 죽음은 caspase-3 비의존적인 mitotic catastrophe에 의해 일어나는 것으로 사료되어진다.

Keywords

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