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논문 상세정보

동충하초 열수 추출물에 의한 인체 간암세포 성장억제 및 apoptosis 유발에 관한 연구

Induction of Apaopotis by Water Extract of Cordyceps militaris (WECM) in Human Hepatocellular Carcinoma HepG2 Cells.

초록

본 연구에서는 전통 민간의학에서 많이 사용되는 동충하초(C. militaris)의 항암 작용에 관한 근거 자료의 제시를 위하여 동충하초 열수 추출물(WECM)의 항암 기전 해석을 시도하였다. 이를 위하여 HepG2 인체 간암세포를 사용하였으며, WECM의 처리에 의하여 HepG2 세포의 증식은 처리 농도의 증가에 따라 매우 억제되었다. WECM 처리에 의한 HepG2 세포의 증식 억제는 암세포의 심한 형태적 변형을 수반하였고, 이는 apoptosis 유도와 연관성이 있음을 DAPI 염색을 통한 apoptotic body 출현의 증가 및 flow cytometry 분석에 의한 sub-G1 기에 속하는 세포 빈도의 증가로 확인하였다. WECM 처리에 의한 HepG2 세포의 증식 억제는 또한 종양 억제 유전자 p53 및 CDKI p21의 발현 증가와도 연관성이 있음을 알 수 있었다. WECM 처리에 의한 apopotosis 유도에서 pro-apoptotic 인자인 Bax의 발현이 전사 및 번역 수준에서 매우 증가하였으며, caspase-3의 활성이 매우 높게 증가되었다. 특히 caspase-3 특이적 억제제인 z-DEVD-fmk로 caspase-3의 활성을 인위적으로 차단시켰을 경우, WECM에 의한 HepG2 세포의 apoptosis 유발에 caspase-3이 중심적인 역할을 하고 있음을 알 수 있었다. 본 연구 결과는 WECM의 생화학적 항암기전 해석을 이해하고 향후 수행될 추가 실험을 위한 기초 자료로서 그 가치가 매우 높은 것으로 생각된다.

Abstract

Cordyceps militaris, the Chinese medicinal fungal genus Cordyceps, is reported to possess many pharmacological activities including immunological stimulating, anti-cancer, anti-virus and anti-infection activities. However, the molecular mechanisms of C. militaris on biochemical actions in cancer have not been clearly elucidated yet. In the present study, we investigated the anti-proliferative activity of the water extract of C. militaris (WECM) in human hepatocellular carcinoma HepG2 cells. It was found that WECM could inhibit the cell growth in a dose-dependent manner, which was associated with morphological changes and apoptotic cell death such as formation of apoptotic bodies and increased populations of apoptotic sub-G1 phase. Apoptotic cell death of HepG2 cells by WECM was connected with a up-regulation of pro-apoptotic Bax expression, tumor suppressor p53 and cyclin-dependent kinase inhibitor p21 (WAF1/CIP1). In addition, WECM treatment induced the proteolytic activation of caspase-3 and a concomitant degradation and/or inhibition of poly (ADP-ribose) polymerase (PARP), ${\beta}-catenin$ and phospholipase $(PLC)-{\gamma}1$ protein. Furthermore, caspase-3 inhibitor, z-DEVD-fmk, significantly inhibited WECM-induced apoptosis demonstrating the important role of caspase-3 in the observed cytotoxic effect. Taken together, these findings provide important new insights into the possible molecular mechanisms of the anti-cancer activity of C. militaris.

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  1. Park, Young-Mi ; Jeong, Jin-Boo ; Seo, Joo-Hee ; Lim, Jae-Hwan ; Jeong, Hyung-Jin ; Seo, Eul-Won 2011. "Inhibitory Effect of Red Bean (Phaseolus angularis) Hot Water Extracts on Oxidative DNA and Cell Damage" 韓國資源植物學會誌 = Korean journal of plant resources, 24(2): 130~138 
  2. Park, Young Mi ; Lim, Jae Hwan ; Lee, Jong Eun ; Seo, Eul Won 2013. "Effect of Hydropsyche kozhantschikovi Extracts on Oxidative Stress" 생명과학회지 = Journal of life science, 23(1): 31~37 
  3. Park, Young Mi ; Lim, Jae Hwan ; Lee, Jong Eun ; Seo, Eul Won 2014. "Inhibitory Effect of Extract from Acanthocoris sordidus on Oxidative Damage" 생명과학회지 = Journal of life science, 24(10): 1078~1084 

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