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

  • 제35권3호
  • /
  • Pages.335-343
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  • 2006
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  • 1226-3311(pISSN)
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  • 2288-5978(eISSN)
한국식품영양과학회 (The Korean Society of Food Science and Nutrition)
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식이급여형태가 고지방식이를 급여한 흰쥐 지방조직의 지방합성 및 지방합성 효소활성에 미치는 영향

Effect of Meal Pattern on Lipogenesis and Lipogenic Enzyme Activity in Rat Adipose Tissue Fed High Fat Diet

  • 이재준 (조선대학교 식품영양학과) ;
  • 최현숙 (조선대학교 식품영양학과) ;
  • 정은 (조선대학교 식품영양학과) ;
  • 최병대 (경상대학교 해양생물이용학부) ;
  • 이명렬 (조선대학교 식품영양학과)
  • 발행 : 2006.03.01
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초록

본 연구는 식이급여형태를 달리하면서 고지방식이를 급여한 흰쥐의 부고환지방조직과 장간막지방조직의 지방조직 부위별 지방합성량, 지방합성에 관여하는 주된 효소인 ME, G6PDH 및 6PGDH 활성 및 지방축적의 주된 효소인 LPL 활성에 미치는 영향을 구명하였다. Sprague-Dawley 계통 수컷 흰쥐 16마리를 체중에 따라 2군으로 나누어 4주간 실시하였고, ad libitum군은 실험 식이를 무제한 급여하였으며, meal-fed군은 1일 1회 3시간씩 제한 급여하였다. 지방조직의 지방합성량은 포도당이 총지방으로 변하는 양으로 측정하였고, 지방조직의 G6PDH, 6PGDH 및 ME 활성은 NADPH 생성량으로 측정하였다. 또한 지방조직의 LPL 활성과 혈청 지단백질, 중성지방 및 insulin 함량도 측정하였다. Meal-fed군이 ad libitum군에 비해 식이섭취량 저하로 인한 증체량 및 부고환지방조직과 장간막지방조직의 무게가 유의하게 저하되었다. 혈청 총콜레스테롤, HDL-콜레스테롤 및 LDL-콜레스테롤 함량은 식이급여형태에 따른 유의차가 없었으나, 혈청 중성지방 함량은 meal-fed군이 ad libitum군에 비해 유의하게 증가하였고, insulin 함량은 저하되었다. 지방합성량 및 G6PBH과 6PGDH 활성은 부고환지방조직과 장간막지방조직 모두 meal-fed군이 ad libitum군에 비해 증가하였으나, ME 활성은 식이급여형태에 따른 유의차가 없었다. 지방조직의 HR-LPL과 TE-LPL 활성은 meal-fed군이 ad libitum군에 비해 유의하게 높았다. 지방조직 부위에 따른 차이는 지방함량, 지방합성량 및 G6PDH와 LPL 활성은 부고환지방조직에 비해 장간막지방조직에서 낮은 경향이었다. 이와 같이 meal feeding시 섭취한 에너지를 체지방 형태로 더 많이 보유하도록 지방조직내 지방합성량과 지방합성 관련 효소들의 활성을 증가시켜 체내 대사에 영향을 미치는 것으로 사료된다. 또한 지방조직 부위에 따라 지방대사에 미치는 영향이 다르다는 것을 알 수 있었다.

This study was undertaken to investigate the effects of meal pattern on lipogenesis and activities of lipogenic enzyme in rats epididymal and mesenteric adipose tissues. A high fat diet was fed either ad libitum or in 1 meal during the last 3 h of the dark cycle for 4 weeks. Lipogenesis was measured as glucose conversion to total lipid and activities of glucose-6-phosphate dehydrogenase (G6PDH), 6-phophogluconate dehydrogenase (6PGDH) and NADP-malate dehydrogenase (ME) were determined by measuring NADPH production. Lipoprotein lipase (LPL) activity and serum lipoprotein concentrations were also measured. Meal-fed (3 h) rats had a decreased food intake, body weight and carcass fat compared with rats fed ad libitum. The serum triglyceride concentration of meal-fed rats tended to be higher than that of the ad libitum rats. However, there were no differences between meal-fed group and ad libitum group in serum concentrations of HDL-cholesterol, LDL-cholesterol and total-cholesterol. Rates of lipogenesis in both epididymal and mesenteric adipose tissues were significantly higher in the meal-fed group than that in the ad libitum group. In addition, meal-fed group showed higher G6PDH, 6PGDH and LPL activities in both epididymal and mesenteric adipose tissues, but exerted no significant effect on ME activity. These results suggest that meal-fed rats compared with ad libitum rats have marked lipogenic capacity, although such elevation probably does not result in increase in carcass fat concentration. Thus, meal-fed diet can be an important determinant of the alterations in adipose lipid metabolism.

키워드

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