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Yin Yang-1 suppresses CD40 ligand-CD40 signaling mediated anti-inflammatory cytokine interleukin-10 expression in pulmonary adventitial fibroblasts by promoting histone H3 tri-methylation at lysine 27 modification on interleukin-10 promoter.

08:00 EDT 21st March 2020 | BioPortfolio

Summary of "Yin Yang-1 suppresses CD40 ligand-CD40 signaling mediated anti-inflammatory cytokine interleukin-10 expression in pulmonary adventitial fibroblasts by promoting histone H3 tri-methylation at lysine 27 modification on interleukin-10 promoter."

During the pathogenesis of early pulmonary arterial hypertension (PAH), pulmonary arterial adventitial fibroblast act as an initiator and mediator of inflammatory processes that predispose vessel walls to excessive vasoconstriction and pathogenic vascular remodeling. Emerging studies report that Yin Yang-1 (YY-1) plays important roles in inflammatory response and vascular injury. Our recent study finds that activation of CD40L-CD40 signaling promotes pro-inflammatory phenotype of pulmonary adventitial fibroblasts. However, whether YY-1 is involved in CD40L-CD40 signaling-triggered inflammatory response in pulmonary adventitial fibroblasts and its underlying mechanism is still unclear. Here, we show that soluble CD40L (sCD40L) stimulation promotes YY-1 protein expression and suppresses anti-inflammatory cytokine, IL-10 expression in pulmonary adventitial fibroblasts, while YY-1 knockdown prevents sCD40L-mediated reduction of IL-10 expression via enhancing IL-10 gene transactivation. Further, we find that sCD40L stimulation significantly increases H3K27me3 modification on IL-10 promoter in pulmonary adventitial fibroblasts, and YY-1 knockdown prevents the effect of sCD40L on IL-10 promoter through reducing interacting with EZH2, a histone methyltransferase, binding to IL-10 promoter. Moreover, we find that sCD40L stimulation promotes YY-1 protein, but not mRNA expression, via decreasing m6A methylation on YY-1 mRNA to suppress YTHDF2-medicated mRNA decay. Overall, this in-depth study shows that activation of CD40L-CD40 signaling upregulates YY-1 protein expression in pulmonary adventitial fibroblasts, which results in increasing YY-1 and EZH2 binding to the IL-10 promoter region to enhance H3K27me3 modification, eventually leading to suppress IL-10 transactivation. This study firstly uncovers the roles of YY-1 on CD40L-CD40 signaling-triggered inflammatory response in pulmonary adventitial fibroblasts. This article is protected by copyright. All rights reserved.

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Name: Cell biology international
ISSN: 1095-8355
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Medical and Biotech [MESH] Definitions

A membrane glycoprotein and differentiation antigen expressed on the surface of T-cells that binds to CD40 ANTIGENS on B-LYMPHOCYTES and induces their proliferation. Mutation of the gene for CD40 ligand is a cause of HYPER-IGM IMMUNODEFICIENCY SYNDROME, TYPE 1.

A member of the tumor necrosis factor receptor superfamily with specificity for CD40 LIGAND. It is found on mature B-LYMPHOCYTES and some EPITHELIAL CELLS, lymphoid DENDRITIC CELLS. Evidence suggests that CD40-dependent activation of B-cells is important for generation of memory B-cells within the germinal centers. Mutations of the gene for CD40 antigen result in HYPER-IGM IMMUNODEFICIENCY SYNDROME, TYPE 3. Signaling of the receptor occurs through its association with TNF RECEPTOR-ASSOCIATED FACTORS.

Members of the tumor necrosis factor receptor superfamily with specificity for CD40 LIGAND. They are found on mature B-LYMPHOCYTES, some EPITHELIAL CELLS; and lymphoid DENDRITIC CELLS. Evidence suggests that CD40-dependent activation of B-cells is important for generation of memory B-cells within the germinal centers. Mutations in the CD40 antigen gene result in HYPER-IGM IMMUNODEFICIENCY SYNDROME, TYPE 3. Signaling of the receptor occurs through its association with TNF RECEPTOR-ASSOCIATED FACTORS.

An X-linked hyper-IgM immunodeficiency subtype resulting from mutation in the gene encoding CD40 LIGAND.

A signal transducing tumor necrosis factor receptor associated factor that mediates signaling from CD27 ANTIGENS; CD40 ANTIGENS; and the LYMPHOTOXIN BETA RECEPTOR. It is involved in regulation of NF-KAPPA B signaling.

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