생명과학회지 (Journal of Life Science)

  • 제27권1호
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  • Pages.8-14
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  • 2017
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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소교세포에서 heme oxygenase-1 발현 유도를 통한 치자(Gardenia jasminoides)의 항염증 효과

Gardenia jasminoides Exerts Anti-inflammatory Activity via Akt and p38-dependent Heme Oxygenase-1 Upregulation in Microglial Cells

  • 송지수 (부산대학교 자연과학대학 분자생물학과) ;
  • 신지은 (부산대학교 자연과학대학 분자생물학과) ;
  • 김지희 (부산대학교 자연과학대학 분자생물학과) ;
  • 김영희 (부산대학교 자연과학대학 분자생물학과)
  • Song, Ji Su (Department of Molecular Biology, College of Natural Sciences, Pusan National University) ;
  • Shin, Ji Eun (Department of Molecular Biology, College of Natural Sciences, Pusan National University) ;
  • Kim, Ji-Hee (Department of Molecular Biology, College of Natural Sciences, Pusan National University) ;
  • Kim, YoungHee (Department of Molecular Biology, College of Natural Sciences, Pusan National University)
  • 투고 : 2016.08.26
  • 심사 : 2016.09.22
  • 발행 : 2017.01.30
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초록

치자 열매는 아시아에서 음식과 옷의 염료로 사용되어 왔다. 본 연구에서는 BV-2 소교세포에서 치자열매 열수추출물(GJ)의 항염증 효과를 관찰하고 그 작용 기전을 연구하였다. GJ는 세포에 독성을 유도하지 않으면서 lipopolysaccharide로 인한 nitric oxide (NO) 분비와 inducible nitric oxide synthase (iNOS) 생성 및 활성산소 생성을 억제하였다. 또한 GJ는 농도의존적으로 heme oxygenase-1 (HO-1)의 발현을 유도하였다. 더군다나 HO-1 siRNA를 처리했을 때는 GJ가 iNOS의 발현을 억제하지 못하였다. GJ는 HO-1의 발현에 관여하는 전사인자인 nuclear factor E2-related factor 2를 핵으로 이동시켰다. 또한 GJ에 의한 HO-1의 발현은 phosphatidylinositol 3-kinase(PI-3K) 및 p38 kinase 억제제에 의해 감소되었으며, GJ가 Akt와 p38 kinase의 인산화를 유도하였다. 이상의 결과를 종합해보면, GJ는 PI3K/Akt 및 p38 신호전달과정을 통해 HO-1의 발현을 유도함으로써 NO와 같은 염증매개물질의 생성을 억제한다는 것을 알 수 있다. 이러한 연구결과는 치자열매가 신경염증을 억제하는 새로운 기전을 밝힌 것이다.

Died Gardenia jasminoides fruit is used as a dye in the food and clothes industries in Asia. The present study investigated the anti-inflammatory effects of aqueous extract of G. jasminoides fruits (GJ) in BV-2 microglial cells. GJ inhibited lipopolysaccharide-induced nitric oxide (NO) secretion, inducible nitric oxide synthase (iNOS) expression, and reactive oxygen species production, without affecting cell viability. Furthermore, GJ increased the expression of heme oxygenase-1 (HO-1) in a dose-dependent manner. Moreover, the inhibitory effect of GJ on iNOS expression was abrogated by small interfering RNA-mediated knock-down of HO-1. In addition, GJ induced nuclear translocation of nuclear factor E2-related factor 2 (Nrf2), a transcription factor that regulates HO-1 expression. GJ-mediated expression of HO-1 was suppressed by LY294002, a phosphoinositide 3-kinase (PI-3K) inhibitor, and SB203580, a p38 kinase inhibitor, but not by the extracellular signal-regulated kinase (ERK) inhibitor PD98059 or c-Jun N-terminal kinase (JNK) inhibitor SP600125. GJ also enhanced the phosphorylation of Akt and p38. These results suggest that GJ suppresses the production of NO, a pro-inflammatory mediator, by inducing HO-1 expression via PI-3K/Akt/p38 signaling. These findings illustrate a novel molecular mechanism by which extract from G. jasminoides fruits inhibits neuroinflammation.

키워드

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