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Relationship between Bone Morphological Microstructure and Inflammatory Markers in Growing Mice Fed a High Fat Diet

고지방식이 공급에 따른 성장기 마우스의 골의 형태학적 미세구조와 염증지표 변화

  • Kim, Mi-Sung (Department of Food and Nutrition, Wonkwang University) ;
  • Lee, Hyun-A (Center for Animal Resources Development, Wonkwang University) ;
  • Kim, Ok-Jin (Center for Animal Resources Development, Wonkwang University) ;
  • Sohn, Cheong-Min (Department of Food and Nutrition, Wonkwang University)
  • 김미성 (원광대학교 식품영양학과) ;
  • 이현아 (원광대학교 동물자원개발연구센터) ;
  • 김옥진 (원광대학교 동물자원개발연구센터) ;
  • 손정민 (원광대학교 식품영양학과)
  • Received : 2011.10.18
  • Accepted : 2011.11.17
  • Published : 2011.12.31

Abstract

Obesity not only reduces bone mineral density but also increases inflammatory markers. Therefore, we examined the change in inflammatory markers and morphological microstructure of the bones using a mouse model fed a high-fat diet. C57BL/6J 4-week-old male mice were divided into a control group (n = 6) and a experimental group (n = 6); the control group was provided with 10% Kcal fat diet, and the high-fat diet group was provided with 45% Kcal fat diet for 12 weeks using the free provision method. Blood was analyzed for inflammatory markers, and micro-computed tomography was used to measure the morphological microstructure of the femoral bone. The weight increases in the control group and high-fat diet group were $5.85{\pm}1.84g$ and $16.06{\pm}5.64g$, respectively (p < 0.01), glucose was $115.00{\pm}16.88mg/dL$ and $188.33{\pm}13.29mg/dL$ (p < 0.01), and triglycerides were $65.00{\pm}6.19mg/dL$ and $103.33{\pm}8.02mg/dL$ (p < 0.05) respectively. Leptin and interleukin (IL)-6 were significantly higher in the high-fat diet group than that in the control group (p < 0.01). As a result of a biochemical index analysis of bone metabolism, osteocalcin tended to be lower in the high-fat diet group, whereas CTx was significantly higher in the high-fat diet group compared to that in the control group (p < 0.01). The thickness of the bony trabecula was significantly narrower in the high-fat diet group than that in the control group (p < 0.05), and the gap in the bony trabecula was significantly wider in the high-fat diet group than that in the control group (p < 0.05). IL-6 and the gap in the bone trabecula, which was a morphological microstructure of the bones, showed a positive correlation (p < 0.05). Taken together, inducing obesity through a high-fat diet in mice during the growth phase caused a change in bone microstructure and was correlated with the inflammation index. Accordingly, restriction of excessive fat intake may be needed to suppress the inflammatory reactions and promote normal bone formation.

본 연구에서는 성장기 마우스 모델을 이용하여 고지방식 이를 제공한 후 이에 따른 염증지표와 골의 형태학적 미세구조의 변화를 살펴보았다. C57BL/6J 4주령 수컷 마우스를 난괴법에 의해 대조군 (n = 6)과 실험군 (n = 6)로 분류하여 대조군에는 10% Kcal fat 식이와 고지방식이군에는 45% Kcal fat 식이를 12주 동안 자유급식 방법으로 제공하였다. 혈액검사와 염증지표를 분석하였으며 micro-CT를 이용하여 대퇴부 뼈의 형태학적 미세구조를 측정하였다. 대조군과 고지방식이군의 체중 증가는 각각 $5.85{\pm}1.84g$, $16.06{\pm}5.64g$로 유의한 차이를 보였으며 (p < 0.01), 혈당은 각각 $115.00{\pm}16.88mg/dL$, $188.33{\pm}13.29mg/dL$ (p < 0.01), 중성지방은 각각 $65.00{\pm}6.19mg/dL$, $103.33{\pm}8.02mg/dL$ (p < 0.05)로 나타났다. 렙틴과 IL-6는 고지방식이군에서 유의적으로 높게 나타났다 (p < 0.01). 골대사의 생화학적지표 분석 결과 오스테오칼신은 고지방식이군에서 낮게 나타났으나 유의적이지 않았으며, CTx은 고지방식이군에서 유의적으로 높게 나타났다 (p < 0.01). 골밀도는 고지방식이군에서 낮게 나타났으나 유의적인 차이는 보이지 않았다. 그러나 골의 형태학적 미세구조 분석결과 골소주의 두께는 고지방식이 군이 대조군보다 유의적으로 좁게 나타났으며 (p < 0.05), 골소주의 간격은 고지방식이군이 유의적으로 넓게 나타났다 (p < 0.05). 골의 형태학적 미세구조인 골소주의 간격과 IL-6가 양의 상관성이 나타났다 (p < 0.05). 본 연구결과 최대골밀도가 형성되는 단계의 성장기 마우스에서 고지방식이 공급을 통한 비만 유도 현상은 골소주의 수와 골소주가 차지하는 비율의 변화를 유발하여 골 미세구조에 영향을 미치는 것으로 나타났으며, 염증지표와 상관성이 나타났다. 이에 성장기에 염증지표 증가를 억제하고 정상적인 골형성을 위하여 과잉의 지방섭취 제한이 필요할 것으로 사료된다.

Keywords

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