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

Genomic analysis of microRNA time-course expression in liver of mice treated with genotoxic carcinogen N-ethyl-N-nitrosourea - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

BMC Genomics

, 11:609

Human and rodent genomics


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.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2164-11-609 contains supplementary material, which is available to authorized users.

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Autor: Zhiguang Li - William S Branham - Stacey L Dial - Yexun Wang - Lei Guo - Leming Shi - Tao Chen


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