Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Anti-inflammatory effects of mulberry twig extracts on dextran sulfate sodium-induced colitis mouse model

상지추출물이 Dextran Sulfate Sodium으로 유도된 대장염 마우스 모델에 미치는 항염증 효능

  • Cui, Xuelei (Department of Food Science and Nutrition, Daegu Catholic University) ;
  • Kim, Eunjung (Department of Food Science and Nutrition, Daegu Catholic University)
  • 최설뢰 (대구가톨릭대학교 식품영양학과) ;
  • 김은정 (대구가톨릭대학교 식품영양학과)
  • Received : 2019.03.01
  • Accepted : 2019.03.18
  • Published : 2019.04.30
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Abstract

Purpose: Ulcerative colitis is a common inflammatory bowel disease. Prolonged colitis can be a risk factor for the development of colorectal cancer. Mulberry twig (MT, Sangzhi), a dry branch of Morus alba L., which is widely distributed throughout East Asia, has been shown to have anti-inflammatory activities in the cells. However, the effects of MT extracts on colitis in in vivo are limited. Therefore, in this study, we investigated the anti-inflammatory effects of MT extracts in the dextran sulfate sodium (DSS)-induced mouse colitis model. Methods: Six week-old, male ICR mice were divided into 3 groups: Control (n = 5), DSS (n = 7), and DSS+MT (n = 7) groups. Mice in the DSS and DSS+MT groups were administrated 3% DSS in drinking water for 5 days to induce colitis. At the same time, water extracts of MT (5 g/kg body weight/day) were orally administered to mice in the DSS+MT groups for 5 days. Results: The MT extracts significantly reduced the clinical and pathological characteristics of colitis. Disease activity index, mucosal thickness, and colonocyte proliferation were significantly reduced in the DSS+MT group compared with the DSS group. Furthermore, MT administration reduced the levels of plasma $TNF-{\alpha}$, IL-6, and the colonic myeloperoxidase activity as well as mRNA expression of $TNF-{\alpha}$, IL-6, Cox-2, and iNOS. Conclusion: Taken together, these results suggest that MT water extracts have potent anti-colitis activities in the mouse colitis model.

본 연구는 DSS 유도 대장염 마우스 모델에서 MT열수 추출물의 항대장염 효능을 확인하고자 ICR 마우스에 5일 동안 3% DSS와 함께 MT추출물을 경구투여한 후 대장염의 임상적 증상 및 염증 지표들을 분석하였다. 그 결과 MT추출물의 투여는 DSS에 의해 유도된 마우스 대장염 증상의 지표들, 즉 체중 감소와 혈성 설사를 포함한 질병 활성도, 대장점막증식, 그리고 $TNF-{\alpha}$와 IL-6를 포함한 염증성 사이토카인량 증가를 개선시키는 것으로 나타났다. 또한 DSS에 의해 증가된 Cox-2, iNOS, p-Erk 등 염증 지표 단백질의 발현도 MT추출물 투여군에서 감소되었다. 이러한 결과들은 MT추출물이 항대장염 효능이 있음을 제시하며 향후 MT추출물에 포함되어 있는 생리활성물질의 효능과 관련기작이 규명된다면 상지를 물로 우려내어 섭취하는 상지차 형태의 대장염 예방 혹은 개선용 건강식품으로의 개발을 기대해 볼 수 있을 것으로 사료된다.

Keywords

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