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http://dx.doi.org/10.5352/JLS.2009.19.1.021

Microarray Analysis of Gene Expression by Rhei Rhizoma Water Extracts in a Hypoxia Model of Cultured Neurons  

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)
Publication Information
Journal of Life Science / v.19, no.1, 2009 , pp. 21-33 More about this Journal
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.
Keywords
Cell culture; hippocampal neuron; hypoxia; microarray; Rhei Rhizoma;
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