Unknown,Transcriptomics,Genomics,Proteomics

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Fatty Acid Amide Hydrolase regulates peripheral B cell receptor revision, polyreactivity and B1 cells in lupus

ABSTRACT: FAAH expresson is induced in Sle2 splenic B cells. Increased peripheral B cell receptor revision, or selective peripheral expansion of BCR-revised B-cells, may lead to systemic autoimmunity, and FAAH is a lupus susceptibility gene that could regulate this process in Sle2 mice. To determine the gene expression profile in peripheral B cells from Sle2 mice (compared to B6 mice), we isolated splenic B cells from these two strains of mice, extracted the total mRNA and performed the microarray analysis Please note that Sle2 mouse is a congenic strain that harbors the Sle2 locus from Chromosome 4 of NZM2410 strain in a B6 background and Sle2 is the name of the lupus susceptibility locus.

ORGANISM(S): Mus musculus

SUBMITTER: Simanta Pathak

PROVIDER: E-GEOD-73112 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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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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Fatty Acid Amide Hydrolase regulates peripheral B cell receptor revision, polyreactivity and B1 cells in lupus

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