Translatomes of monocytes and macrophages
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ABSTRACT:
PROVIDER: PRJNA879755 | ENA |
REPOSITORIES: ENA
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Project description:RNA modifications are essential for the establishment of cellular identity. Although increasing evidence indicates that RNA modifications control the innate immune response, their role in monocyte-to-macrophage differentiation and polarisation is unclear. We profile translatomes of monocytes and macrophages at resting, pro- and anti-inflammatory states.
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Project description:We developed a simplified flow cytometry strategy in order to discriminate monocytes and macrophages in the lung of C57BL/6 mice. Using this strategy, we identified autofluorescent F4/80+ CD11c+ alveolar macrophages, non-autofluorescent CD64+Ly-6C- interstitial macrophages and Ly-6Chi monocytes residing in the lung of WT mice. A fraction of these Ly-6Chi monocytes corresponded to classical blood monocytes associated with the lung vasculature, but another fraction did not depend on CCR2, the chemokine receptor required for monocytes to egress from the bone marrow, as a population of lung Ly-6Chi monocytes was also present in the lung of Ccr2-/- mice. A remaining question was whether lung monocytes represented a particular population of monocytes that could be distinguishable from the classical CCR2-dependent blood monocytes. To address this issue, we performed a transcriptomic comparison of Ly-6Chi monocytes recovered from flushed lung of WT mice (â60% of CCR2- dependent classical blood monocytes and â40% of lung monocytes) and Ccr2-/- mice (more than 95% of lung monocytes). In addition, we tested whether exposure to TLR ligands would affect interstitial macrophages, and we compared to transcriptome of IM at steady-state and IM 1 week after administration of 50 µg CpG-DNA intratracheally.
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Project description:Macrophages play a key role in both innate and adaptive immunity, but our knowledge on the changes in transcription regulation that occurs during their differentiation from monocytes is still limited. In this study, we used a meta-analysis followed by a systems biology approach for the identification of differentially expressed genes between monocytes and macrophages and possible regulators of these changes in transcription. Based on the pattern of gene expression change, transcription regulator analysis predicted a decrease in Enhancer of Zeste homolog 2 (EZH2), a histone 3 lysine 27 methyl transferase, activity after differentiation of monocytes into macrophages. This inhibition was validated by a significant decrease in trimethylated H3K27 during differentiation of both human primary monocytes into macrophages and the THP-1 cell line into macrophage-like cells. Overexpressing EZH2 during differentiation of monocytes and THP-1 cells obstructs cellular adhesion, thus preventing the first step in differentiation. Another facet of macrophage differentiation is the cessation of proliferation, and inhibition of EZH2 by the small molecule inhibitor GSK126 in THP-1 cells indeed impedes proliferation. This study shows an important part for epigenetic changes during monocyte differentiation. It highlights the role of EZH2 activity behind the changes needed in adhesion and proliferation mechanisms for macrophage formation. Monocytes isolated from human peripherial mononuclear cells were differentiated in monocyte derived macrophages by M-CSF stimulation
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Project description:microRNA profiling data includes biological replicates of primary monocytes and macrophages from three human donors Dye swap hybridization arrays were performed for total RNA isolated from fresh monocytes and 7-day monocyte-derived macrophages from each of three human donors
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Project description:Expression profiles at different time points during dendritic cell differentiation (induced by specific culture conditions) including monocytes as well as expression profiles between monocytes and completely differentiated cells (macrophages at day7 and dendritic cells at day7, respectively) were compared. Monocyte-derived dendritic cells (DC) were obtained by culturing elutriated monocytes with 20U/ml IL-4, 280U/ml GM-CSF and 10% FCS; monocyte-derived macrophages (MAC) were obtained by culturing elutriated monocytes with 2% AB serum. Three to seven biological replicates that are derived from independent healthy donors were included. One-color based gene expression. 2 datasets: dendritic cell kinetic study and comparison of monocyte, macrophage, and dendritic cells
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