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ROS Scavenging Effect and Cell Viability of Opuntia humifusa Extract on Osteoblastic MC3T3-E1 Cells

천년초 추출물이 조골세포의 증식과 ROS소거능에 미치는 영향

  • Hwang, Hyun-Jung (Department Food and Nutrition, Silla University) ;
  • Jung, Bok-Mi (Major in Food Science and Nutrition, Chonnam National University) ;
  • Kim, Mi-Hyang (Department Food and Nutrition, Silla University)
  • 황현정 (신라대학교 식품영양학과) ;
  • 정복미 (전남대학교 식품영양학과) ;
  • 김미향 (신라대학교 식품영양학과)
  • Received : 2011.11.03
  • Accepted : 2011.12.14
  • Published : 2011.12.31

Abstract

In this study, the effect of the Opuntiahumifusa extracts on proliferation, alkaline phosphatase (ALP) activity, collagen synthesis and ROS level of a cell was investigated using an osteoblast. Opuntiahumifusawas separated intoOpuntiahumifusapeel (OH-P), seed (OH-Se) and stem (OH-St).These were subjected to extraction by using hot water and ethanol. The proliferation of the MC3T3-E1 osteoblastic cells that were treated with OH-Se water extract were increased by approximately 120%. Regarding the effects of OH-Se on ALP activity, the $50{\mu}g/ml$ ethanol extract group showed the highest activity. The synthesis of collagen increased significantly in response to treatment with OH-Se water extract. The ROS scavenging effects of Opuntiahumifusawere investigated for involvement of oxidativedamage, cell culture and staining. Also, when OH-Se water extract $100{\mu}g/ml$ was added, the ROS level decreased by 54%. These results indicate that Opuntiahumifusa extracts have an anabolic effect on bone through the promotion of osteoblastic differentiation, suggesting that it could be used for the treatment of common metabolic bone diseases.

우리나라에서 자생하고 있는 천년초는 새로운 생리활성 물질을 생산할 수 있는 소재로 각광받고 있으며, mouse calvaria 유래의 MC3T3-E1 세포는 골세포의 세포 활성과 관련된 연구에서 유용하게 이용되어 왔다. 따라서 본 연구에서는 MC3T3-E1 세포를 이용하여 천년초 추출물이 세포 증식에 미치는 영향과 ALP 활성, 조골세포의 골 형성을 위한 필수 인자인 collagen 합성에 대한 영향을 검토하고 세포사의 주요 인자인 ROS 에 미치는 영향에 대해 검토하였다. 각 추출물의 수율은 껍질 열수 추출물이 35.2%로 가장 수율이 높았고, 다음으로 줄기 열수 추출물, 껍질 에탄올 추출물, 씨 열수 추출물, 줄기 에탄올 추출물 순으로 나타났으며, 수율이 가장 낮은 씨 에탄올 추출물은 20.6%였다. 각 추출물의 농도(1, 10 50, $100{\mu}g/ml$)에 따른 조골세포 성장에 미치는 영향을 MTT assay로 분석한 결과, 모든 군에서 대조군과 비교하여 유의적인 증식률을 나타내었으며 특히, $100{\mu}g/ml$ 씨 열수 추출물을 첨가하였을 때, 대조군과 비교하여 가장 높은 120% 정도의 증식률을 나타내었다. 천년초 추출물이 ALP 활성에 미치는 영향을 조사한 결과, 천년초 추출물을 $10\sim50{\mu}g/ml$ 첨가하였을 때, 대조군과 비교하여 유의적으로 증가하였으며 특히, 씨 에탄올 추출물을 $50{\mu}g/ml$ 첨가하였을 때, 130% 이상의 ALP 활성을 증가시켜 조골세포의 분화에 영향을 줄 가능성이 제시 되었다. 천년초 추출물이 조골세포의 collagen 합성에 미치는 실험결과에서는 천년초 씨 열수 추출물과 씨 에탄올 추출물의 $50\sim100{\mu}g/ml$ 농도에서 높은 합성능을 나타내었으며 그 중 씨 열수 추출물 $100{\mu}g/ml$ 농도에서 가장 높은 collagen 합성능을 보였다. 천년초 추출물이 세포내 ROS생성에 미치는 영향을 실험한 결과에서는 모든 천년초 추출물 처리에 의해 농도 의존적으로 형광 강도가 감소하는 경향을 보였으며 특히, 씨 열수 추출물의 $100{\mu}g/ml$ 경우, 대조군에 비해 54% 정도 ROS가 감소되어 천년초씨 추출물이 세포 내에서 높은 항산화력이 있는 것을 확인할 수 있었다. 따라서 천년초 추출물이 조골세포의 증식, ALP 활성, collagen 합성 및 ROS 생성 저해를 촉진하여 골 생성에 영향을 줄 수 있는 것이 확인되었으며, 추출 용매와 관계없이 씨 추출물이 가장 높은 활성을 나타내었다. 천년초 씨 중의 활성 성분 구명을 위해 향후 구체적 기작 연구와 in vivo 연구가 병행된다면, 골다공증 예방과 관련된 기능성 식품의 천연소재 개발이 가능할 것이라 사료된다.

Keywords

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