생명과학회지 (Journal of Life Science)

  • 제28권5호
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  • Pages.509-516
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  • 2018
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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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노각나무 잎에서 분리된 플라보노이드에 의한 대식세포에서 산화질소 생성 억제효과

Inhibitory Effects of Flavonoids Isolated from the Leaves of Stewartia koreana on Nitric-oxide Production in LPS-stimulated RAW 264.7 Cells

  • 이승수 (경희대학교 피부생명공학센터) ;
  • 방면호 (경희대학교 피부생명공학센터) ;
  • 박세호 (계명대학교 자연과학연구소) ;
  • 정대균 (경희대학교 피부생명공학센터) ;
  • 양선아 (계명대학교 식품가공학전공)
  • Lee, Seung-Su (Skin Biotechnology Center, Kyung Hee University) ;
  • Bang, Myun-Ho (Skin Biotechnology Center, Kyung Hee University) ;
  • Park, Se-Ho (Institute of Natural Science, Keimyung University) ;
  • Chung, Dae-kyun (Skin Biotechnology Center, Kyung Hee University) ;
  • Yang, Seun-Ah (Department of Food Science and Technology, Keimyung University)
  • 투고 : 2018.02.22
  • 심사 : 2018.03.13
  • 발행 : 2018.05.30
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초록

노각나무(Stewartia koreana) 잎 에틸아세테이트 분획으로부터 quercetin (1), quercitrin (2), hyperin (3), quercetin-3-O-(6"-O-galloyl)-${\beta}$-D-galactopyranoside (4), kaempferol-3-o-[2",6"-di-o-(trans-p-coumaroyl)]-${\beta}$-D-glucopyranoside (5)의 5종의 플라보노이드를 분리하였으며, 이들 5종 성분의 염증 반응에 대한 활성을 분석하기 위하여 LPS를 처리한 대식세포에서 산화질소(NO) 생성 억제활성을 측정하였다. 이들 5종 성분 중 compound 4, 5는 노각나무에서 처음으로 분리된 것으로 항염증 활성에 대한 보고도 없다. 분광분석법으로 확인된 노각나무 잎 유래 성분들은 LPS 처리한 대식세포의 NO 생성을 유의적으로 저해하였으며, 특히 kaempferol-3-o-[2",6"-di-o-(transp-coumaroyl)]-${\beta}$-D-glucopyranoside (5)는 가장 강한 억제효과(17.17%, 5.0%, 3.92%, 6.32% and 63.35% inhibition of compound 1, 2, 3, 4 and 5 at $10{\mu}g/ml$)를 나타냈다. 또한, 이러한 NO 생성 억제효과는 inducible nitric oxide synthase(iNOS) 단백질 발현 억제를 통한 것으로 나타났다. 따라서, 본 연구에서 새로 분리된 플라보놀인 kaempferol-3-o-[2",6"-di-o-(trans-p-coumaroyl)]-${\beta}$-D-glucopyranoside (5)는 노각나무 잎의 항염증 활성을 나타내는 주요 물질로 사료된다.

Five phenolic compounds were isolated from the ethyl acetate fraction of leaves from Stewartia koreana, and their nitric-oxide (NO) inhibitory activities were measured to identify the major active constituents responsible for the efficacy of the extract against inflammatory reactions. These five compounds were quercetin (1), quercitrin (2), hyperin (3), quercetin-3-O-(6"-O-galloyl)-${\beta}$-D-galactopyranoside (4), and kaempferol 3-O-[2",6"-di-O-(trans-p-coumaroyl)]-${\beta}$-D-glucopyranoside (5). Among the separated compounds in the EtOAc fraction, compounds 4 and 5 were isolated for the first time, and no study has yet reported their anti-inflammatory effects. The compounds were identified by spectroscopic analysis, and the isolated compounds showed significant NO inhibitory effects in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells. Compound 5 showed the most potent inhibitory effect (63.35% inhibition) against LPS-induced NO production compared to that of compound 1 (17.17%), compound 2 (5.0%), compound 3 (3.92%), and compound 4 (6.32%) at $10{\mu}g/ml$ concentration. NO production was inhibited by suppressing the protein expression of inducible nitric-oxide synthase in LPS-stimulated RAW 264.7 macrophages. These results indicate that kaempferol 3-O-[2",6"-di-O-(trans-p-coumaroyl)]-${\beta}$-D-glucopyranoside might be the major active compound responsible for the anti-inflammatory effects of S. koreana.

키워드

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