Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effects of Sea Tangle Extract on Formation of Collagen and Collagen Cross-link in Ovariectomized Rats

다시마 추출물이 갱년기 유도 흰쥐의 collagen 및 collagen 가교물질의 형성에 미치는 영향

  • Lee, Young-Ae (Department of Food Science and Nutrition, Silla University) ;
  • Kim, Mi-Hyang (Department of Food Science and Nutrition, Silla University)
  • 이영애 (신라대학교 자연과학대학 식품영양학과) ;
  • 김미향 (신라대학교 자연과학대학 식품영양학과)
  • Published : 2008.11.30
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Abstract

The purpose of this study was to investigate the effects of sea tangle (ST) extracts on formation of collagen and collagen cross-link in ovariectomized rats. From day 3 until 42 after the ovariectomy, Sprague-Dawley female rats were randomly assigned to the following groups: sham-operated rats(Sham), ovariectomized control rats (OVX-control), ovariectomized rats supplemented with ST at 50 mg/kg bw/day (OVX-ST50), 200 mg/kg bw/day (OVX-ST200). The ethanol extraxcr of ST was orally administrated at 1 ml/day. The change of collagen content was investigated in bone, cartilage and skin of ovariectomized rats. Effects of ST extract on the amount of collagen was examined by measuring the hydroxyproline, which is a specific amino acid existing in collagen. The ovariectomy resulted in a decrease in the levels of collagen content in bone and cartilage tissues. However, the supplementation with the sea tangle extract prevented the decrease in the collagen level in bone and cartilage tissues. Pyridinoline is pyridinium cross-link formed in the mature form of collagen from lysine and hydroxylysine residues. Although the pyridinoline content in bone collagen declined after ovariectomy, it was recovered to a normal level of Sham group by the supplementation with the ST extracts. In addition, the deoxypyridinoline content in bone collagen, which was reduced after ovariectomy was enhanced to normal level by the supplementation with the ST extract. These results was consistent with the conclusions based on estrogenic activities of ST.

폐경을 앞둔 여성에게는 폐경을 전후하여 지속되는 골 손실 가속화 등의 문제점을 가지고 있다. 그러므로 본 연구에서는 인위적 폐경을 유발시킨 난소 절제 쥐에서의 골 손실의 유무를 결합조직 중의 collagen 함량 변화를 통하여 그 효과를 검토하였다. 그 결과 생화학적 골 대사 지표인 혈 중 ALP 활성은 난소 절제(OVX-control)로 인하여 증가하는 반면, 난소 절제 후 다시마 추출물 투여(OVX-ST50, OVX-ST200)로 혈중 ALP 활성은 감소하는 경향을 보여 골 흡수를 저하시킬 수 있는 가능성을 나타내었다. 한편 난소 절제 후 collagen 함량이 감소하였으나, 다시마 추출물 투여에 의해 피부조직과 골.연골 조직에서 collagen 함량이 증가하는 경향을 보였고, 특히 OVX-ST200군은 각 조직 모두 OVX-control에 비하여 유의적으로 증가하였다(p<0.05). Collagen의 성숙 가교물질인 pyridinoline 함량 또한 난소 절제 후 골, 연골 조직 중에서 감소하였으나 다시마 추출물을 투여한 군에서 증가하는 경향을 나타내었다. 골에서의 deoxypylidinoline 함량은 난소를 절제하지 않은 Sham군이 OVX-control군에 비해서 유의적으로 높은 값을 나타냈고(p<0.05), 난소 절제 후 다시마 추출물을 농도별로 투여한 군(OVX-ST50 및 OVX-ST200)에서 유의 적으로 높은 값을 나타내어(p<0.05), 난소 절제 시 합성이 감소되는 deoxypyridinoline 생성량을증가시켰다. 에스트로겐 감소로 인한 결합조직 중 collagen 함량 저하가 다시마 추출물 투여에 의해 증가된 본 실험 결과로 미루어 보아 다시마 중의 phytoestrogen이 에스트로겐 유사효과를 나타냄을 알 수 있었다. 이상과 같이 폐경으로 인한 장애를 감소시키기 위하여 에스트로겐의 장기간 복용에 의한 부작용을 다시마 중의 phytoestrogen이 estrogen 대체 작용을 함으로써 그 부작용을 감소시켜 줄 것으로 사료되며, 이들의 구조 및 기전에 대해서는 앞으로 연구가 더 필요 한 것으로 생각된다.

Keywords

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