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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Green Tea Products on Bone Metabolism Marker in Ovariectomized Rats with High Cholesterol Diet Intake

고콜레스테롤 식이를 섭취한 난소절제 흰쥐에서 녹차가공품이 골 대사 지표에 미치는 효과

  • Noh, Kyung-Hee (BK21 Center of Smart Foods and Drugs, Food Science Institute, and Biohealth Product Research Center, Inje University) ;
  • Jang, Ji-Hyun (BK21 Center of Smart Foods and Drugs, Food Science Institute, and Biohealth Product Research Center, Inje University) ;
  • Cho, Mi-Kyung (BK21 Center of Smart Foods and Drugs, Food Science Institute, and Biohealth Product Research Center, Inje University) ;
  • Song, Young-Sun (BK21 Center of Smart Foods and Drugs, Food Science Institute, and Biohealth Product Research Center, Inje University)
  • 노경희 (인제대학교 BK21 식의약생명공학과, 식품과학연구소 및 바이오헬스 소재 연구센터) ;
  • 장지현 (인제대학교 BK21 식의약생명공학과, 식품과학연구소 및 바이오헬스 소재 연구센터) ;
  • 조미경 (인제대학교 BK21 식의약생명공학과, 식품과학연구소 및 바이오헬스 소재 연구센터) ;
  • 송영선 (인제대학교 BK21 식의약생명공학과, 식품과학연구소 및 바이오헬스 소재 연구센터)
  • Published : 2008.12.31
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Abstract

This study was designed to evaluate the effect of green tea products (GTP) on bone metabolism marker in ovariectomized (OVX) rats fed high cholesterol diet. Forty Sprague-Dawley female rats, 10 weeks of age ($279{\pm}2g$), were divided into 4 groups and fed on the experimental diets for 6 weeks: sham operated control (Sham-C) and OVX-control (OVX-C) groups treated high cholesterol diet. OVX-GTP 5% (OVX-G5) and OVX-GTP 20% (OVX-G20) groups were treated with high cholesterol diet containing 5% GTP and 20% GTP, respectively. Food efficient ratio was significantly (p<0.05) lower in OVX-G20 than in the other OVX groups. Bone mineral density of femur was not significantly different among the experimental groups in the order of Sham-C>OVX-G5 and OVX-G20>OVX-C. Alkaline phosphatase activities on serum was lower in the GTP supplement groups than in the OVX-C. Estradiol levels of serum were higher in the GTP supplement groups than in the OVX-C. Osteocalcin levels of serum was the lowest in the OVX-G20. Deoxypyridinoline crosslink values of urine, indicator of bone absorption, was the lowest in the OVX-G20 group. The GTP supplemented groups had a lower bone resorption ratio than in the OVX-C group. From the above results, these findings suggest the possibility of using GTP as a functional food materials related to bone metabolism in menopause.

본 연구는 폐경 후 녹차잎 함유 건강기능성 제품으로 녹차가루(15%)와 녹차잎 추출물(35%), 두충추출물(15%), 감잎추출물(15%), 검정콩 가루(18%) 및 찹쌀 풀과 꿀(2%) 등을 배합하여 조제된 녹차가공품(이하 GTP)이 고콜레스테롤 식이를 섭취시킨 난소절제 흰쥐의 골 대사에 미치는 효과를 알아보았다. 실험동물은 10주령의 Sprague-Dewley 암컷 흰쥐(평균 체중 $279{\pm}2g$)로 완전임의배치로 한 군당 10마리씩 4군으로 나누어 사육하였으며 양쪽 난소를 절제(ovariectomy: OVX)하였다. Sham 대조군은 실험군과 동일한 스트레스를 주기 위해 난소를 절제하지 않고 개복수술만 실시한 후 2주간 배합사료를 급여한 후 Sham-대조군(Sham-C)과 OVX-대조군(OVX-C)은 AIN' 76에 기초해서 제조한 콜레스테롤 첨가 식이를, OVX 실험군은 콜레스테롤 첨가 식이에 GTP 5%(OVX-G5)와 20%(OVX-G20)를 함유한 실험 식이를 조제하여 6주간 급여하였다. 식이 조제 시 Ca 함량은 총 식이의 0.4% 수준으로 조정하였으며 Sham-C, OVX-C와 OVX-G5는 $CaCO_3$를 첨가하여 조정하였고 OVX-G20은 Ca 함량이 0.4%였으므로 별도의 $CaCO_3$를 첨가하지 않았다. OVX군에서의 식이효율은 OVX-G5가 유의적으로 낮았으며 Sham-C과 유사한 수준을 보였다. 대퇴골의 골밀도는 각 군 간에 유의적인 차이는 없었으나 Sham-C> OVX-G5와 OVX-G20> OVX-대조군의 순으로 나타났다. 골격 형성의 생화학적 지표인 alkaline phosphatase 활성은 OVX군 간에 유의적인 차이는 나타내지 않았으나 GTP를 첨가한 식이를 섭취한 군에서는 다소 감소되는 경향을 보였다. Estradiol의 농도는 각 군 간의 유의적인 차이를 보이지 않았으나 Sham-C> OVX-G20> OVX-G5> OVX-C의 순으로 나타나 GTP 20%를 첨가한 군과 Sham-C가 유사한 수준을 보였다. Osteocalcin 농도는 OVX-C에 비해 GTP를 첨가한 군에서 유의적으로 감소하였으며 GTP의 첨가량이 많을수록 혈청 osteocalcin 수준이 감소하였고 OVX-G20에서는 Sham-C와 유사한 수준으로 나타났다. 본 연구의 결과는 ALP 활성이 증가될수록 osteocalcin의 농도도 증가되는 경향을 보였다. DPD crosslink value는 OVX-G20이 OVX-C 에 비해 유의적으로 낮은 수준이었다. 폐경기에 ALP 활성과 osteocalcin의 농도가 높은 것은 골 교체율이 빠른 것을 나타내므로 난소절제 흰쥐에서 GTP가 골 교체율을 감소시켜 골흡수를 억제함으로써 골 보호 효과를 나타내는 것으로 사료된다. 그러나 GTP 5%와 20%의 첨가량에 따른 차이는 보이지 않았다. 이상의 결과들로 미루어 볼 때 난소절제 흰쥐모델의 골 대사 지표에 다소 유리하게 영향을 미치는 것으로 나타나 녹차가공품이 골다공증 예방을 위한 기능성식품으 로서의 가능성을 보여주었으며, 골다공증 예방을 위한 녹차 가공품의 효과적인 섭취량은 계속적으로 연구가 진행되어야 할 것으로 사료된다.

Keywords

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