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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Anti-Inflammatory Activity of Austroinulin from Stevia rebaudiana in LPS-induced RAW264.7 Cells

스테비아로부터 분리한 Austroinulin의 RAW264.7 세포에 대한 항염증 효과

  • 변명우 (우송대학교 외식조리영양학부)
  • Received : 2012.02.24
  • Accepted : 2012.03.15
  • Published : 2012.04.30
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Abstract

The leaves of $Stevia$ $rebaudiana$ are well-known in Japan, Korea, and China as a natural sweetener. Medicinal uses of this plant originated in Paraguay and Brazil in the form of aqueous decoctions of the leaves used as a contraceptive agent and for the treatment of hyperglycemia. In the present study, the antioxidant, anti-hypertension, and anti-inflammatory activities of $S.$ $rebaudiana$ extracts are investigated for their use in food. The biologically-active compound was isolated and purified from $S.$ $rebaudiana$. The isolated compound was identified as austroinulin ($C_{20}H_{34}O_3$; molecular weight 322) by mass, IR spectrophotometry, 1D, and 2D-NMR. Austroinulin was characterized as a diterpenoid possessing a 3-methylpenta-2,4-dienyl at C-9. When subjected to an inflammatory mediator inhibitory assay from lipopolysaccharide (LPS)-activated macrophages, the austroinulin inhibited the enhanced production of nitric oxide (NO) and inducible nitric oxide synthase (iNOS) expression (10 ${\mu}g$/mL＝67.9 and 45.1%, respectively). This was significant and dose-dependent. The results suggest that austroinulin from $S.$ $rebaudiana$ inhibited the NO and iNOS in RAW 264.7 cells.

본 연구에서는 스테비아는 이용성이 높은 식물임에도 불구하고 diterpene 성분에 대한 생리활성이 과학적으로 주로 연구된 바 없어 active-guided fractionation 방법을 이용하여 항염증 효과를 나타내는 지표화합물을 규명하기 위해 실리카겔 칼럼크로마토그래피 방법을 이용하여 분리 및 정제한 후, $^1H$와 $^{13}C$-NMR, COSY, DEPT, HMQC, HMBC spectrum(500 MHz, $CDCl_3$), MS, IR 분석을 통하여 분자량 322의 astroinulin임을 구조 동정하였다. 특히 HMBC spectrum을 통해 분리된 화합물이 decalin system에서 C-9에 3-methylpenta-2,4-dienyl 치환체를 가지고 있음을 알 수 있었다. 분리된 astroinulin을 RAW264.7 세포에 2.5, 5, 10 ${\mu}g$/mL 처리한 결과 농도 의존적으로 NO의 생성을 억제하였다. 마찬가지로 iNOS protein의 발현에서도 농도 의존적으로 저해 하였으며, 화합물을 2.5, 5, 10 ${\mu}g$/mL 처리한 결과 각각 11.4, 26.8, 45.1% 감소하였다. Astroinulin 화합물을 10 ${\mu}g$/mL의 낮은 농도에서 NO와 iNOS를 각각 67.9, 45.1%를 저해하는 결과를 나타내었다. 이와 같은 결과는 스테비아에서 분리된 astroinulin 화합물은 RAW264.7 세포에서 LPS에 의해 유도된 NO와 iNOS 단백질을 유의적으로 억제하는 것으로 확인되어 이를 이용한 기능성식품 및 의약품 개발 가능성을 지닌 약용 식물자원인 것으로 판단된다.

Keywords

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