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Anti-Obesity Effects of Salted and Unsalted Doenjang Supplementation in C57BL/6J Mice Fed with High Fat Diet

식이유도 비만 Mice에서 된장 및 무염된장의 항비만 효과

  • Bae, Cho-Rong (Dept. of Food Science and Human Nutrition, Chonbuk National University) ;
  • Kwon, Dae Young (Food Functional Research Division, Korean Food Research Institutes) ;
  • Cha, Youn-Soo (Dept. of Food Science and Human Nutrition, Chonbuk National University)
  • Received : 2013.03.12
  • Accepted : 2013.04.10
  • Published : 2013.07.31

Abstract

The aim of the present study is to elucidate the anti-obesity effects of Doenjang with and without salt in C57BL/6J mice. For the analysis, a total of forty mice were randomly divided into four groups: normal diet group (ND), high-fat diet group (HD), high-fat diet supplemented with 20% Doenjang group (DJ), high-fat diet supplemented with 20% unsalted Doenjang group (NS). During the study period, food intake and body weight were measured daily and weekly, respectively. The animals were sacrificed after 12 weeks. Body weight gain, epididymal fat pad weight and serum triglyceride levels of DJ group were found to be significantly lower than those of the HD and NS groups. Serum total-cholesterol levels of DJ and NS groups were significantly lower as compared to the HD group. There were significant decreases in plasma insulin and leptin levels in DJ group compared with the HD and NS groups. We did not observe any significant changes in the expression of hepatic lipogenic-related gene $PPAR{\gamma}$ among the HD, DJ and NS groups. However, ACC expression was found to be significantly decreased in DJ group. Lipolysis-related gene ($PPAR{\alpha}$ and CPT-1) expression was significantly higher in the DJ group as compared to HD and NS groups. In conclusion, the results of this study showed that Doenjang supplementation lowers body weight gain and improves obesity-related parameters.

본 연구는 된장과 된장 제조시 염을 제거한 무염된장이 고지방식이로 비만/제2형 당뇨가 유도되는 C57BL/6J mice에 항비만 효과에 미치는 영향을 평가하고자 하였다. 체중 증가량 및 부고환지방은 된장첨가식이군(DJ)이 고지방식이군(HD) 및 무염된장첨가식이군(NS)과 비교하여 유의적으로 낮아졌다. 혈중 중성지방은 고지방식이군(HD)에 비해 된장첨가식이군(DJ) 및 무염된장첨가식이군(NS)에서 유의적으로 낮아졌고, 그중 된장첨가식이군(DJ)이 무염된장첨가식이군(NS)보다 28.12% 유의적으로 감소하였다. 총콜레스테롤 함량은 고지방식이군(HD)과 비교하여 된장첨가식이군(DJ) 및 무염된장첨가식이군(NS)에서 유의적으로 낮은 값을 나타냈다. 또한 HDL-콜레스테롤 비율(HDL-C/TC(%))은 된장첨가식이군(DJ)과 무염된장첨가식이군(NS)이 고지방식이군(HD)보다 유의적으로 높아졌다. 혈중 insulin 농도는 된장첨가식이군(DJ)이 무염된장첨가식이군(NS)보다 유의적으로 감소하였으며, leptin 농도는 고지방식이군(HD)과 비교시 된장첨가식이군(DJ) 및 무염된장첨가식이군(NS)에서 유의적으로 감소하였다. 간에서의 지방산 합성 및 산화 관련 유전자 발현 수준을 측정한 결과, $PPAR{\gamma}$ mRNA 발현수준은 모든 실험군(HD, DJ 및 NS)에서 증가하였으며, ACC mRNA 발현 수준은 무염된장첨가식이군(NS)보다 고지방식이군(HD) 및 된장첨가식이군(DJ)에서 유의적으로 낮아졌다. 또한 $PPAR{\alpha}$ mRNA 발현 수준은 된장첨가식이군(DJ)에서 고지방식이군(HD) 및 무염된장첨가식이군(NS)와 비교하여 유의적으로 증가하였으며, CPT-1 mRNA 발현수준은 고지방식이군(HD) 및 된장첨가식이군(DJ)이 무염된장첨가식이군(NS)보다 유의적으로 증가하였다. 결론적으로 본 실험결과, 된장이 무염된장보다 항비만 효과에 긍정적인 결과를 보였다. 하지만 된장이 무염된장보다 더 유의적인 결과를 보인 점은 미생물의 생육과 발효 시 무기질의 공급원이기도 한 염이 무염된장 제조 시 탈염과정에서 항비만에 관여하는 무기질과 함께 제거되면서 된장의 항비만 효능이 감소되었을 가능성이 있을 것으로 보인다. 따라서 향후 탈염과정 및 식염이 비만에 미치는 메커니즘을 심도 있게 연구하여 소금섭취를 줄이면서 기능성을 유지하는 연구가 필요하다.

Keywords

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