Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Cytotoxicity and Chemosensitizing Effect of Camellia(Camellia japonica) Tea Extracts

동백엽차와 화차의 세포독성 및 다제내성 극복효과

  • 황은주 (동신대학교 생물자원산업화지원센터) ;
  • 차영주 (동신대학교 산업용가속기 이용 생물연구센) ;
  • 박민희 (동신대학교 산업용가속기 이용 생물연구센) ;
  • 이장원 (동신대학교 산업용가속기 이용 생물연구센) ;
  • 이숙영 (동신대학교 산업용가속기 이용 생물연구센터)
  • Published : 2004.03.01
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Abstract

This study has been undertaken to increase availability of native camellia in Jeonnam as a medicinal resource and to isolate the effective components from them. Fresh leaf and flower of camellia, single camellia tea and camellia tea mixed with green tea, herbs were screened for cytotoxicity on MCF -7 (human breast adenocarcinoma pleual effusion), Calu-6 (human pulmonary carcinoma), SNU-601 (human gastric carcinoma) cells. Also their multidrug-resistance reversing activity were evaluated using drug sensitive AML-2/WT and multidrug-resistant AML-2/D100 cells. Among the camellia extracts, young leaf and camellia tea mixed with green tea had strong growth inhibitory effects in below 100 $\mu\textrm{g}$/mL against human cancer cells. In result, young leaf showed the strongest inhibitory effects on MCF -7 ($IC_{50}$/ = 100 $\mu\textrm{g}$/mL ↑), Calu-6 ($IC_{50}$/ = 79 $\mu\textrm{g}$/mL), and SNU -601 ($IC_{50}$/ = 39 $\mu\textrm{g}$/mL), and AML-2/WT ($IC_{50}$/ = 64 $\mu\textrm{g}$/mL). Chemosensitizing effect was the extracts of mature leaf ($IC_{50}$/ = 97 $\mu\textrm{g}$/mL, RF=3.0), roasted tea ($IC_{50}$/ = 76 $\mu\textrm{g}$/mL, RF = 2.6 ↑) and steam tea ($IC_{50}$/ = 70 $\mu\textrm{g}$/mL, RF=2.8 ↑) strongly potentiate vincristine cytotoxicity in AML-2/D100 cells. But their cytotoxicities to both sensitive AML-2/WT and resistant AML-2/D100 cells were in the same order of magnitude. This results indicate that crude extracts of camellia mature leaves would contain some principles which have chemosensitizing activity.

동백나무의 생엽과 생화, 그리고 이를 재료로 제다한 단일 동백엽차$.$화차 및 혼합 동백차의 세포독성과 다제 내성 극복을 규명하기 위하여, 4종의 인간암세포(MCF-7, Calu-5, SNU-601, AML-2/WT)와 1종의 다제내성 세포주(AML-2/ D100)를 이용하여 MTT방법으로 분석하였다. 동백의 어린엽 추출물은 Calu-6($IC_{50}$/: 79.8 $\mu\textrm{g}$/mL), SNU-601($IC_{50}$/: 39.0 $\mu\textrm{g}$/mL)에 대해 성엽과 꽃에 비해 세포독성 효과가 높았다. 단일 동백엽 차중, 찐차는 덜음차나 차차에 비해 상당한 생육 억제효과를 보였으며, 혼합 동백 차의 경우, Cahemix보다는 Catemix추출물이 MCF-7, Calu-6에 대한 $IC_{50}$/: 100 $\mu\textrm{g}$/mL 이하의 낮은 농도에서 세포 증식 억제 및 사멸 효과가 현저히 상승됨을 보여주었다. 특히 Catemix-2를 첨가하였을 때 MCF-7과 Calu-6 암세포에서 $IC_{50}$/값이 각각 75.3과 74.6으로 높은 억제효과를 나타내었다. 시료에 대하여 감수성 세포인 AML-2/WT에 대하여 세포독성을 측정하여 감수성 세포에 비하여 내성 세포에 대하여 선택적 세포독성 여부를 관찰한 결과, 대체적으로 $IC_{50}$/의 차이가 없거나 내성세포의 $IC_{50}$/이 높게 나타내어 그다지 선택적 세포독성을 나타내지 않는 것으로 보인다. 혼합 동백차의 경우, 내성세포에 대한 선택적 세포독성은 Catemix-2(녹차와 동백엽의 덜음차의 혼합)와 Catemix-3(녹차와 동백화차의 혼합)에서 0.9로 다소 효과를 보였으며, 내성 극복 효과는 Cahemix-1(CR: 1.7)에서 높게 관찰되었다.

Keywords

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