Clinical and Experimental Pediatrics

The Korean Pediatric Society (대한소아청소년과학회)
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Capsaicin induced apoptosis and the enhanced anticancer effect of anticancer drugs in cancer cells

종양세포에서의 capsaicin에 의한 apoptosis 유도와 항암제의 항암효과의 증가

  • Kim, Sun Young (Research Institute of Clinical Medicine, Chonbuk National University) ;
  • Lee, You Jin (Research Institute of Clinical Medicine, Chonbuk National University) ;
  • Park, Eun Hye (Research Institute of Clinical Medicine, Chonbuk National University) ;
  • Yi, Ho Keun (Department of Biochemistry, School of Dentistry, Chonbuk National University) ;
  • Jo, Dae Sun (Department of Pediatrics, School of Medicine, Chonbuk National University) ;
  • Kim, Jung Soo (Department of Pediatrics, School of Medicine, Chonbuk National University) ;
  • Hwang, Pyoung Han (Department of Pediatrics, School of Medicine, Chonbuk National University)
  • 김선영 (전북대학교 임상의학연구소) ;
  • 이유진 (전북대학교 임상의학연구소) ;
  • 박은혜 (전북대학교 임상의학연구소) ;
  • 이호근 (전북대학교 치과대학 생화학교실) ;
  • 조대선 (전북대학교 의과대학 소아과학교실) ;
  • 김정수 (전북대학교 의과대학 소아과학교실) ;
  • 황평한 (전북대학교 의과대학 소아과학교실)
  • Received : 2007.09.16
  • Accepted : 2007.11.10
  • Published : 2008.03.15
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Abstract

Purpose : Capsaicin, the major pungent ingredient in red pepper, has long been used in spices and food additives. It has been recently shown to induce apoptosis in several cell lines through a not well known mechanism. The aim of this study was to investigate the apoptosis-inducing effect of capsaicin on gastric cancer cells, and to provide valuable information concerning the application of capsaicin for therapeutic purposes. Methods : Cultured SNU-668 cells were treated with capsaicin. We analyzed cell survival by trypan blue and crystal violet analysis, cell cytotoxicity by MTT assay, apoptosis by nuclear condensation and DNA fragmentation, bcl-2 and bax mRNA expression by RT-PCR, and the expression of apoptosis related proteins by Western immunoblot analysis. In order to assess whether the growth inhibitory effect of anticancer drugs is enhanced by capsaicin, we investigated the effects of cell cytotoxicity and the expression of apoptosis related proteins of etoposide and adriamycin treated with capsaicin in cells. Results : Capsaicin inhibited growth of SNU-668 cells in a dose-dependent manner. This inhibitory effect of capsaicin on cell growth was mainly due to the induction of apoptosis as evidenced by DNA fragmentation, nuclear condensation and the expression of apoptosis related proteins. Furthermore, capsaicin prominently reduced the ratio of anti-apoptotic Bcl-2 to pro-apoptotic Bax and consequently increased caspase-3 activity. The cells treated with capsaicin were more sensitive to death induced by etoposide and adriamycin than the cells without capsaicin. Conclusion : These results demonstrate that capsaicin efficiently induced apoptosis in SNU-668 cells through a caspase-3-dependent mechanism and sensitizes cancer cells to anticancer drugs toward apoptotic cell death, which may contribute to its anticancer effect and chemosensitizer function against gastric cancer.

목 적 : 한국인 음식에 널리 이용되고 있는 중요한 향신료인 고추에 많이 들어있는 capsaicin이 최근 많은 연구를 통해 암을 예방하고 더 나아가 치료할 수 있는 성분으로 밝혀지고 있다. 따라서 본 연구의 목적은 한국인이 많이 섭취하고 있는 식이성분인 capsaicin이 한국인에 많은 위암세포의 세포자멸사의 유도물질로 가능성을 알아보고 이를 항암치료의 일부분으로 시도하고자 하였다. 방 법 : 한국인의 위암세포주인 SNU-668 세포에 capsaicn를 처리한 후 세포 생존은 trypan blue 와 crystal violet 분석, 세포독성은 MTT 분석, 세포사 분석은 핵 응축과 DNA 분절화 실험, bcl-2와 bax의 mRNA 발현은 역전사 중합효소 연쇄반응, 세포사와 관련된 단백질 발현은 Western immunoblot analysis로 분석하였다. Capsaicin에 의해 항암제의 감수성이 증가되는 지를 알아보기 위하여 일정 농도의 capsaicin과 농도 별 각 항암제를 같이 처리하여 2일 간 배양 하고 MTT assay로 분석하였으며 이와 관련된 세포사와 관련된 단백질 발현을 분석하였다. 결 과 : capsaicin의 농도에 따라 SNU-668 위암세포의 증식을 현저히 억제하였으며, 이러한 capsaicin의 증식 억제는 DNA 단편화, 핵 응축과 caspase 활성화에 의해 세포자멸사의 유도에 의한 것으로 입증되었다. 더욱이 capsaicin에 의해 pro-apoptotic Bax에 대한 anti-apoptotic Bcl-2의 비율이 현저히 감소하고, caspase-3활성이 증가하였다. Capsaicin을 처리한 세포는 처리하지 않은 세포에 비하여 etoposide나 adriamycin에 의해 유도되는 세포사멸에 더욱 감수성을 보였다. 결 론 : 이상의 연구에서 capsaicin은 caspase-3 의존적 경로를 통하여 SNU-668 세포에서 세포자멸사를 유도하며 항암제의 감수성을 증가시키므로 위암의 효과적인 항암치료제와 항암제 민감성 유도제의 일환으로 가능성이 있다.

Keywords

Acknowledgement

Supported by : 전북대학교

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