Genomic analysis of microRNA time-course expression in liver of mice treated with genotoxic carcinogen N-ethyl-N-nitrosourea

BMC Genomics

Research Article

Lei Guo¹  Zhiguang Li²  Tao Chen²  Stacey L Dial²  Leming Shi³  William S Branham³  Yexun Wang⁴ 

[1] Division of Biochemical Toxicology, National Center for Toxicological Research, FDA, 72079, Jefferson, AR, USA;Division of Genetic and Molecular Toxicology, National Center for Toxicological Research, FDA, 72079, Jefferson, AR, USA;Division of Systems Biology, National Center for Toxicological Research, FDA, 72079, Jefferson, AR, USA;SABiosciences Corporation, 21703, Frederick, MD, USA;

关键词: miRNA Expression;    Ingenuity Pathway Analysis;    miRNA Expression Profile;    Carcinogen Exposure;    Genotoxic Carcinogen;   

DOI  :  10.1186/1471-2164-11-609

 received in 2010-08-04, accepted in 2010-10-28,  发布年份 2010

来源: Springer

【 摘 要 】

BackgroundDysregulated expression of microRNAs (miRNAs) has been previously observed in human cancer tissues and shown promise in defining tumor status. However, there is little information as to if or when expression changes of miRNAs occur in normal tissues after carcinogen exposure.ResultsTo explore the possible time-course changes of miRNA expression induced by a carcinogen, we treated mice with one dose of 120 mg/kg N-ethyl-N-nitrosourea (ENU), a model genotoxic carcinogen, and vehicle control. The miRNA expression profiles were assessed in the mouse livers in a time-course design. miRNAs were isolated from the livers at days 1, 3, 7, 15, 30 and 120 after the treatment and their expression was determined using a miRNA PCR Array. Principal component analysis of the miRNA expression profiles showed that miRNA expression at post-treatment days (PTDs) 7 and 15 were different from those at the other time points and the control. The number of differentially expressed miRNAs (DEMs) changed over time (3, 5, 14, 32, 5 and 5 at PTDs 1, 3, 7, 15, 30 and 120, respectively). The magnitude of the expression change varied with time with the highest changes at PTDs 7 or 15 for most of the DEMs. In silico functional analysis of the DEMs at PTDs 7 and 15 indicated that the major functions of these ENU-induced DEMs were associated with DNA damage, DNA repair, apoptosis and other processes related to carcinogenesis.ConclusionOur results showed that many miRNAs changed their expression to respond the exposure of the genotoxic carcinogen ENU and the number and magnitude of the changes were highest at PTDs 7 to 15. Thus, one to two weeks after the exposure is the best time for miRNA expression sampling.

【 授权许可】

Unknown   
© Li et al; licensee BioMed Central Ltd. 2010. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.