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MiRNAs expression in the splenic CD4+ T cells and B cells isolated from MRL/lpr mice at 5 and 16 weeks of age

ABSTRACT: To identify any differentially expressed miRNAs in the CD4+ T cells of lupus. MicroRNAs (miRNAs) have been implicated as fine-tuning regulators controlling diverse biological processes at the level of posttranscriptional repression. Dysregulation of miRNAs has been described in various disease states, including human lupus. By using high-throughput microRNA profiling analysis, we identified that two miRNAs (miR-21 and miR-148a) overexpressed in CD4+ T cells from both lupus patients and lupus-prone MRL/lpr mice,which promote cell hypomethylation by repressing DNA methyltransferase 1 (DNMT1) expression.

ORGANISM(S): Mus musculus

PROVIDER: GSE21220 | GEO | 2010/07/07

SECONDARY ACCESSION(S): PRJNA126533

REPOSITORIES: GEO

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Project description:Our previous study demonstrated a significant upregulation of a large set of miRNAs at the genomic imprinted Dlk1-Dio3 locus in lymphocytes of diverse murine lupus-prone strains. The upregulation of Dlk1-Dio3 miRNAs in lupus-prone mice is correlated with the global DNA hypomethylation. In this study, by performing genome-wide DNA methylation analysis, we reported that Dlk1-Dio3 genomic region in CD4+ T cells of MRL/lpr mice was hypomethylated, further linking hypomethylation to the increased expression of Dlk1-Dio3 miRNAs in lupus. Then, we assessed the gene expression levels of enzymes that either write (DNA methyltransferases, DNMTs) or erase DNA methylation (Ten-eleven translation proteins, TETs) to understand the molecular contributor to the DNA hypomethylation in MRL/lpr CD4+ T cells. The expression levels of Dnmt1, Dnmt3b, Tet1, and Tet2 were significantly increased in CD4+ T cells of MRL/lpr mice, as well as in B6/lpr and B6.sle123 mice, compared to their respective control mice. These data indicate the significant involvement of the TETs-mediated active demethylation pathway rather than reduced DNMTs-mediated passive demethylation pathway in the hypomethylation of murine lupus CD4+ T cells. The transcription factor, early growth response 2 (EGR2) is critically involved in regulating T cell functions and autoimmunity. In this research, we found that Egr2 deletion in B6/lpr mice notably reduced methylation-sensitive Dlk1-Dio3 cluster miRNAs expression in CD4+ T cells. Surprisingly, even though EGR2 has been shown to induce DNA demethylation by recruiting TET2, we found that deleting Egr2 in B6/lpr mice induced a higher number of hypomethylated DMRs than hypermethylated DMRs at either whole genome or the Dlk1-Dio3 locus in CD4+ T cells of B6/lpr mice. These data are the first finding on the positive role of EGR2 on the expression of Dlk1-Dio3 cluster miRNAs in lupus mice. Given that Dlk1-Dio3 miRNAs target the major signaling pathways in autoimmunity, these data provide a new perspective in understanding the potential pathogenic role of upregulated EGR2 in lupus.

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MiRNAs expression in the splenic CD4+ T cells and B cells isolated from MRL/lpr mice at 5 and 16 weeks of age

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