Machaerium cuspidatum 메탄올 추출물의 항산화 및 항암활성에 관한 연구
Anti-oxidative and Anti-cancer Activities of Methanol Extract of Machaerium cuspidatum
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초록
Machaerium cuspidatum은 Fabaceae과 legume속에 속하는 캐노피 덩굴식물(canopy liana)로, 열대 우림 지역에 분포하는 식물이다. 본 연구에서는 Machaerium cuspidatum 메탄올 추출물(MEMC)의 항산화능을 확인하고, 항암 활성 및그 기전을 인체 폐암세포 A549, 인체간암세포 HepG2를 사용하여 분석하였다. 먼저 DPPH를 이용하여 MEMC의 radical 소거능을 분석한 결과, 소거능 50%의 MEMC 농도(IC50)는 1.66 µg/ml이었으며, MEMC가 추출물인 것을 감안할 때 효과적인 항산화능을 보유하고 있음을 알 수 있었다. 또한 MEMC는 A549, HepG2 및 HT29에 대해 농도의존적으로 세포 사멸 효과를 보였으며, 세포 형태 변화를 유도하였다. A549와 HepG2를 사용하여 세포주기를 분석한 결과, MEMC 처리 농도가 증가할수록 apoptotic 세포를 의미하는subG1기의 세포가 증가하였다. 따라서 MEMC에 의한 A549 및 HepG2의 apoptosis 유도를 Annexin V/7AAD 염색으로확인한 결과, A549 및 HepG2에서 MEMC 농도의존적으로Annexin V 양성 세포의 비율이 증가하였으며, DAPI 염색결과 MEMC 농도의존적으로 A549와 HepG2의 apoptotic body가 증가하였다. 특히 MEMC에 의한 apoptosis는 p53과Bax의 발현증가 및 Bcl-2의 발현감소와 연관되어 있으며, caspase-3, -8, -9의 활성화와 poly ADP ribose polymerase (PARP)의 단편화를 일으키는 것을 확인하였다. 이러한 결과들로부터 MEMC는 외인성 및 내인성 경로를 통한 apoptosis 유도에 의해 A549와 HepG2의 증식을 억제시키는 것으로 사료된다.
Abstract
Machaerium cuspidatum, a canopy liana, is a species of genus legume in the Fabaceae family and contributes to the total species richness in the tropical rain forests. In the present study, we investigated the antioxidative and anti-cancer effects of M. cuspidatum and its mode of action. The methanol extract of M. cuspidatum (MEMC) exhibited anti-oxidative activity with an IC50 value of 1.66 μg/ml, and this was attributable to its 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging capacity. MEMC also exhibited a cytotoxic effect and induced morphological changes in a dose-dependent manner in several cancer cell lines including human lung adenocarcinoma A549 cells, human hepatocellular carcinoma HepG2 cells, and human colon carcinoma HT29 cells. Moreover, MEMC treatment induced the accumulation of subG1 population, which is indicative of apoptosis in A549 and HepG2 cells. MEMC-induced apoptosis was confirmed by the increase in Annexin V-positive apoptotic cells and apoptotic bodies using Annexin-V staining and DAPI staining, respectively. Further investigation showed that MEMC-induced apoptosis was associated with the increase in p53 and Bax expression, and the decrease in Bcl-2 expression. In addition, MEMC treatment led to proteolytic activation of caspase-3, 8, and 9 and degradation of poly-ADP ribose polymerase (PARP). Taken together, these results suggest that MEMC may exert a beneficial anti-cancer effect by inducing apoptosis via both the extrinsic and intrinsic pathways in A549 and HepG2 cells.
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