Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Microarray Analysis of Gene Expression by Rhei Rhizoma Water Extracts in a Hypoxia Model of Cultured Neurons

배양신경세포의 저산소증모델에서 대황 물추출물에 의한 유전자 표현 변화의 microarray 분석

  • Lee, Hyun-Sook (Department of Anatomy, College of Medicine, Dongguk University) ;
  • Song, Jin-Young (Department of Anatomy, College of Medicine, Dongguk University) ;
  • Moon, Il-Soo (Department of Anatomy, College of Medicine, Dongguk University)
  • 이현숙 (동국대학교 의과대학 해부학교실) ;
  • 송진영 (동국대학교 의과대학 해부학교실) ;
  • 문일수 (동국대학교 의과대학 해부학교실)
  • Published : 2009.01.30
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Abstract

In this study, we investigated the effect of Rhei Rhizoma (RR; 大黃) water extract on gene expression in a hypoxia model of cultured rat hippocampal neurons. RR water extract $(2.5{\mu}g/ml)$ was added to the culture media on day 10 in vitro (DIV10), and a hypoxic shock (2% $O_2$/5% $CO_2$, $37^{\circ}C$, 3 h) was given on DIV13. After maintaining the cultures in normoxia for 24 hr, total RNA was isolated and used for microarray analysis. The MA-plot indicated that most genes were up- or downregulated within 2-fold. There were more downregulated genes (725 ea) than upregulated ones (472 ea) when larger than Global M value 0.2 (i.e., >15% increase) or smaller than Global M value -0.2 (i.e., >15% decrease) were considered. Antiapoptosis genes such as Tegt (2.4-fold), Nfkb1 (2.4-fold) Veg (1.8-fold), Ngfr (1.6-fold) were upregulated, while pro-apoptosis genes such as Bad (-64%), Cstb (-66%) were downregulated. Genes for combating environmental stress (stress response genes) such as Defb3 (2.7-fold), Cygb (2.2-fold), Ahsg (2.18-fold), Alox5 (2-fold) were upregulated. Genes for cell proliferation (cell cycle-related genes) such as Erbb2 (1.84-fold), Mapk12 gene (1.8-fold) was upregulated. Therefore, RR water extracts upregulate many pro-survival genes while downregulating many pro-death genes. It is interpreted that these genes, in combination with other regulated genes, can promote neuronal survival in a stress such as hypoxia.

대황(Rhei Rhizoma; RR, 대황(大黃))은 Rheum officinale Baill.와 Rheum palmatum L.(polygonaceae)의 땅속부분으로 남아시아의 민속의학에서 간 및 신장의 손상을 치료하는데 널리 이용되고 있다. 본 연구에서는 배양한 흰쥐 해마신경세포의 저산소증모델을 이용하여 대황의 물추출물이 유전자 표현에 미치는 영향을 microarray 방법을 이용하여 조사하였다. 배양 후 10일 (DIV10)에 추출물을 배지에 $2.5{\mu}g/ml$ 농도로 첨가하고, DIV13에 저산소증(2% $O_2$/5% $CO_2$, $37^{\circ}C$, 3 h)을 유발한 후 24 시간 후에 total RNA를 분리하여 microarray에 사용하였다. MA-plot에 의하면 표현이 연화된 대부분의 유전자는 ${\pm}2$배 이내로 증감되었다. 이 가운데 Global M 값이 0.2(즉, 15%)보다 더 증가한 유전자는 472종, Global M 값이 -0.2(즉, -15%)보다 더 감소한 유전자는 725종이였다. 세포의 생존과 관련된 유전자 가운데 세포자연사 억제유전자인 Tegt(2.4배), Nfkb1 (2.4배), Veg (1.8배), Ngfr (1.6배) 등이 크게 증가하였으며, 반면에 자연사 촉진유전자인 Bad (-64%), Cstb (-66%)는 감소하였다. 스트레스를 극복하는데 필요한 유전자인 Defb3 (2.7배), Cygb (2.2배), Ahsg (2.18배), Alox5 (2배) 등도 크게 증가하였다. 그리고 세포 성장을 촉진하는 유전자인 Erbb2 (1.84배), Mapk12 (1.8배)도 크게 증가하였다. 따라서 대황의 물추출물은 세포생존에 필요한 유전자를 증가시키고, 세포사를 유도하는 유전자는 감소시킴으로서 저산소층 스트레스에서 신경세포의 사망을 억제하는 것으로 해석된다.

Keywords

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