Mol. Cells 2011; 31(1): 33~38  DOI: 10.1007/s10059-011-0009-7
Murine Hepatic miRNAs Expression and Regula-tion of Gene Expression in Diet-Induced Obese Mice
Jae-Ho Park, Jiyun Ahn, Suna Kim, Dae Young Kwon, and Tae Youl Ha*
Korea Food Research Institute, Sungnam 463-746, Korea
*Correspondence: tyhap@kfri.re.kr
Received June 15, 2010; Accepted October 20, 2010.; Published online November 25, 2010.
© The Korean Society for Molecular and Cellular Biology. All rights reserved.

ABSTRACT
MicroRNAs are short, non-coding RNA molecules that regulate gene expression primarily by translational re-pression or by messenger RNA degradation. MicroRNAs play crucial roles in various biological processes. However, little is known regarding their role in obesity. We investigated differences of microRNA (miRNA) expression in liver tissue from diet-induced obese mice and potential effects of them on gene and protein expression. We used a miRNA microarray and quantitative RT-PCR to determine miRNA expression in murine liver tissue. Gene and protein expression were determined by qRT-PCR and Western blot analysis. Effects of miRNA by knock-down using RNAi or overexpression on putative target genes and/or proteins in a murine hepatic cell line were also investigated. MicroRNA array and qRT-PCR analsysis revealed that > 50 miRNAs were down- or upregulated more than 2-fold in the liver of diet-induced obese mice. While changes in expression of many genes were observed at the mRNA level, some were only altered at the protein level. Overexpression or knock-down of miR-107 in murine hepatic cells revealed that the expression of its putative target, fatty acid synthase, was dramatically decreased or increased, respectively. In conclusion, more than 50 he-patic miRNAs were dysregulated in diet-induced obese mice. Some of them regulate protein expression at translation level and others regulate mRNA expression at transcriptional level. MiR-107 is downregulated while FASN, a putative target of miR-107, was increased in diet-induced obese mice. These findings provide the evidence of the correlation of miRNAs and their targets in diet-induced obese mice.
Keywords: gene expression, high-fat diet, microRNA, miRNA array, obesity
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