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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effects of Phytoestrogen on Cell Growth and Insulin-like Growth Factor-I (IGF-I) Production in MC3T3-El Cells

식물성 에스트로겐이 MC3T3-El 골아세포의 성장과 Insulin-like Growth Factor-1(IGF-1)생성에 미치는 영향

  • Kwon, Ji-Young (South Sea Fisheries Research Institute, NFRDI) ;
  • Nam, Taek-Jeong (Divison of Food Sciences and Biotechnology, Pukyong National University)
  • 권지영 (국립수산과학원 남해수산연구소) ;
  • 남택정 (부경대학교 식품생명공학부)
  • Published : 2005.07.01
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Abstract

Estrogen is known to play an important role in maintaining bone mass, since the concentration of serum estrogen decrease after menopause and the estrogen deficiency results in bone loss. Phytoestrogens are plant compounds with estrogen-like biological activity, In this study, to investigate the bioactivities of phytoestrogen, which act on bone metabolism, we examined the effect of selected food-borne phytoestrogens (genistein, daidzein and resveratrol) on osteoblast proliferation and IGF-I production using MC3T3-El cells, a mouse calvaria osteoblast-like cell line. Cells were cultured in a serum free medium for 48 hr in the presence of genistein $(10^{-5}\;M)$, daidzein $(10^{-5}\;M)$ and resveratrol $(10^{-5}\;M)$. The effects of genistein, daidzein and resveratrol on the cell proliferation and growth were evaluated by total cell numbers, MTS assay and cell migration assay. Their effect was compared with the $17\beta-estradiol$. Genistein, daidzein and resveratrol exhibited stimulatory effects on the growth of MC3T3-El cells, and the most pronounced effect was shown with daidzein. In addition, these phytoestrogen increased alkaline phosphatase activity of MC3T3-El cells. These effects were similar to that of $17\beta-estradiol$ effects. Moreover, treatment with genistein, daidzein and resveratrol increased production of insulin like growth factor-I (IGF-I) in conditioned media, indicating that the growth promoting effects of these phytoestrogen were related to the changes in production of IGF-I by MC3T3-El cells. These results show that genistein, daidzein and resveratrol have a stimulatory effect on osteoblast function, and that these findings in a cell model may prove relevant to protecting against the loss of bone mass and the development of osteoporosis in human subjects.

식물성 에스트로겐은 에스트로겐의 대체물질로서 골 형성을 촉진하며, 다른 부작용 없이 폐경기 이후 여성의 골다공증 예방에 효과적인 물질로 주목받고 있다. 본 연구에서는 식물성 에스트로겐의 골 형성과 관련된 생리학적 기능을 확인하고자 식물성 에스트로겐인 genistein, daidzein 및 resveratrol을 각각 $10^{-5}$ M 농도로 세포배양액 에 첨가하여 MC3T3-El 골아세포의 증식과 성장에 미치는 효과를 검토 하였다 그 결과 이들은 에스트로겐인 $17\beta$-estradiol과 마찬가지로 MC3T3-El 골아세포의 증식과 성장을 향상시켰으며, daidzein과 resveratrol의 효과는 genistein의 효과보다 큰 것으로 나타났다 골 형성 정도를 판단하는 생화학적 지표로 활용되고 골아세포의 증식과도 밀접한 관계를 가지는 alkaline phosphatase(ALP) 활성 또한 genistein, daidzein 및 resveratrol에 의해 증가하였다. 에스트로겐은 세포성장인자인 IGF-I의 국소적 생산과 분비를 촉진하며 간접적으로 골 대사 촉진 효과를 유도해낼 수 있다고 보고되어 있었지만 식물성 에스트로겐의 투여에 의해 IGF-I의 농도가 증가하였다는 보고는 없었다. 그러나 본 실험 결과, 식물성 에스트로겐인 genistein, daidzein 및 resveratrol은 IGF-I의 단백질과 mRNA 수준을 증가시키는 것으로 나타났다. 이상의 연구결과들은 식물성 에스트로겐의 골 형성 촉진 효과를 증명하는 것으로서 이들의 유용한 약리학적 기능을 뒷받침하는 하나의 근거로 활용될 수 있으리라 사료된다.

Keywords

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