생명과학회지 (Journal of Life Science)

  • 제21권7호
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  • Pages.997-1003
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  • 2011
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
권호 표지
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규칙적 운동이 고지방식이 난소절제흰쥐의 지방세포에서 미토콘드리아 생합성 유전자들의 변화

Change of Mitochondrial Biogenesis Genes on Regular Exercise Training in Adipocytes of Ovariectomized Rats Fed on High Fat Diet

  • 이진 (한양대학교 해부세포생물학교실)
  • Lee, Jin (Department of Anatomy and Cell Biology, Collage of Medicine, Han-Yang University)
  • 투고 : 2011.04.06
  • 심사 : 2011.05.18
  • 발행 : 2011.07.30
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초록

폐경과 비만은 여러 대사증후군과 관련되어 있다. 이에 본 연구는 난소절제로 폐경을 유도한 흰쥐에게 고지방식이로 비만을 유도하여 이들 지방세포에서 발현되는 PPAR${\gamma}$, PGC-$1{\alpha}$, -$1{\beta}$, NRf-1, TFAM 유전자들의 변화를 조사하고 6주간의 규칙적인 운동을 하여 그 차이에 따른 효과를 규명하는데 목적을 두고 조사하였다. 본 실험에서 사용한 암컷흰쥐는 3그룹으로 다음과 같이 구분하였다. (1) 일반식이군(C group, n=4), (2) 고지방식이 군(H group, n=4), (3) 고지방식이와 운동군(H+EX group, n=4)으로 나누었다. 규칙적인 운동은 수영운동을 하였으며, 방법은 주 5회, 총 6주간 점진적 시간증가로 수행하였다. 그 결과, 지방조직의 무게는 H 그룹에서 유의하게 높게 (p<0.01) 나타났으나 규칙적인 운동그룹은 확실히 감소되었다. 또한 규칙적인 운동은 PPAR-${\gamma}$ (p<0.05), PGC-$1{\alpha}$ (p<0.01), -$1{\beta}$ (p<0.05), NRf-1 (p<0.01), TFAM (p<0.05)의 유전자들은 모두 유의하게 증가시켰다. 이상의 결과를 종합하면 6주간의 규칙적인 수영운동은 지방세포 내 PPAR-${\gamma}$, PGC-$1{\alpha}$, -$1{\beta}$, NRf-1, TFAM의 mRNA 발현 증가와 미토콘드리아의 수 증가에 영향을 미친 것으로 추측된다. 따라서 규칙적인 운동은 폐경기 비만으로 비대해진 피하지방을 감소시키고 지방세포 내 미토콘드리아의 생합성기능을 개선시켜 미토콘드리아 수 감소를 개선할 수 있을 것으로 생각된다.

Menopause and obesity are associated with metabolism. The purpose of this study was to examine the changes of PPAR${\gamma}$, PGC-1(${\alpha},\;{\beta}$), NRf-1 and TFAM mRNA and mitochondria biogenesis in adipocytes and investigate the effect of swimming exercise for 6weeks on ovariectomized rats. Rats were randomly assigned to 3 groups: (1) ovariectomized rats fed with a control diet (C, n=4), (2) ovariectomized rats fed with high fat diet (H, n=4), and (3) ovariectomized rats trained to exercise and fed with high fat diet (H+EX, n=4). Exercise was performed by swimming for 5 days/wk, with a progressive increase in exercise over the course of 6 weeks. Results showed that the fat tissue weight in the H group was markedly increased (p<0.01) compared to other groups, however, regular exercise significantly decreased fat weight. The PPAR-${\gamma}$ (p<0.05), PGC-$1{\alpha}$ (p<0.01), -$1{\beta}$ (p<0.05), NRf-1 (p<0.01) and TFAM (p<0.05) mRNA expression in the adipocytes of H+EX were higher than in the H group. These results suggest that regular exercise for 6 weeks might exert positive effects by increasing PPAR-${\gamma}$, PGC-1 (${\alpha},\;{\beta}$), NRf-1 and TFAM mRNA expression and mitochondria in adipocytes. Thus, regular exercise may be helpful in the improvement of mitochondria biogenesis function in obese, ovariectomized rats.

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