Nanostring analysis of the effect of administration of IL-4 on murine Ly6Chi blood monocytes
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE242265 | GEO | 2026/02/20
REPOSITORIES: GEO
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Project description:Analysis of Ly6Chi monocytes from small intestine lamina propria (SILP) and blood of day 8 Toxoplasma gondii infected mice at gene expression level. The hypothesis tested in the present study was that Ly6Chi monocytes from SILP have altered expression of regulatory factors to blood monocytes. Results provide important information on the regulatory to effector balance of genes expressed by Ly6Chi monocytes during an acute inflammatory response.
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Project description:Monocytes comprise two major subsets, Ly6Chi classical monocytes and Ly6Clo non-classical monocytes. Notch2 signaling in Ly6Chi monocytes triggers transition to Ly6Clo monocytes, which require Nr4a1, Bcl6, Irf2 and Cebpb. By comparison, less is known about transcriptional requirements for Ly6Chi monocytes. We find transcription factor CCAAT/enhancer-binding protein alpha (C/EBPα) is highly expressed in Ly6Chi monocytes, but down-regulated in Ly6Clo monocytes. A few previous studies described the requirement of C/EBPα in the development of neutrophils and eosinophils. However, role of C/EBPα for in vivo monocyte development has not been understood. We deleted the Cebpa +37 kb enhancer in mice, eliminating hematopoietic expression of C/EBPα, reproducing the expected neutrophil defect. Surprisingly, we also discovered a severe and selective loss of Ly6Chi monocytes, while preserving Ly6Clo monocytes. We find that BM progenitors from Cebpa +37–/– mice rapidly progress through the cMoP stage to develop directly into Ly6Clo monocytes even in the absence of Notch2 signaling. These results identify a previously unrecognized role for C/EBPα in maintaining Ly6Chi monocyte identity.
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Project description:Monocytes are integral cells of the innate immune system that play important roles in host defence and tissue repair. It is well established that monocytes are derived from the common monocyte progenitor (cMoP) in the bone marrow (BM) before giving rise to Ly6Chi mature monocytes that enter the circulation. However, our lab has discovered that BM Ly6Chi monocytes are not homogenous, and consist of two subpopulations (CXCR4hi and CXCR4lo) in both mice and humans. In particular, the CXCR4hi subset (termed transitional pre-monocyte (TpMo) population) actively proliferates in the BM and matures into the CXCR4lo subset, which represents mature Ly6Chi monocytes. Nevertheless, how this TpMo population may behave beyond their precursor role in the BM remains undefined. While TpMos have been shown to be strictly immobilized in the BM in the steady state, our preliminary data revealed the mobilization of TpMos into the circulation during sepsis. Furthermore, TpMos were found to give rise to more macrophages than mature Ly6Chi monocytes. Our data hence suggests a critical peripheral role for TpMos that may implicate the outcome of sepsis and possible potential implications in future therapies associated with monocytes. Based on our preliminary findings, we aim to have a better understanding of these monocyte subsets and how they are transcriptionally distinct when they have become macrophages. In particular, we would like to determine if TpMo-derived macrophages are less inflammatory compared to mature monocyte-derived macrophages.
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Project description:Hepatic macrophages play a central role in the initiation, progression and resolution of various liver diseases. Specifically, infiltrating Ly6Chi monocytes and their-derived macrophage (MoMFs) descendants prevail in acute or chronic liver injury, display marked transcriptional variance and provide crucial functional plasticity. A specific example of MoMFs are lipid associated macrophages (LAMs) involved in progression of metabolic liver disease (Remmerie et al., 2020). Recent studies have uncovered binary developmental trajectories of monocytes in the BM with Neutrophil-like (NeuMo) and dendritic cell (DC)-like (DCMo) monocytes (Weinreb et al., 2020; Yanez et al., 2017), hence further challenging our current comprehension of macrophage heterogeneity in the diseased liver. Yet, the molecular factors regulating their inflammatory versus restorative activity remains enigmatic. The COMMD (copper metabolism MURR1 domain) family includes 10 evolutionarily conserved proteins. Functions of COMMD proteins are still being defined, but they seem to play non-redundant roles in regulating transcription and protein trafficking. Utilizing conditional COMMD10 knockout mice we uncovered a role for COMMD10 in limiting inflammasome activation in Ly6Chi monocytes during experimental sepsis and colitis (Mouhadeb et al., 2018), and in supporting phagolysosomal biogenesis and maturation in KCs and BM-derived macrophages infected with Staphylococcus aureus (Ben Shlomo et al., 2019). Hence, these studies mark COMMD10 as a candidate mediator of monocyte and macrophage fate and immune responses. Here we studeid the effect of COMMD10-deficiency on Ly6Chi monocyte differentiation and inflammatory behaviour in the injured liver, using an acute model of acetaminophen-induced liver injury (AILI). Bulk RNAseq analysis of sorted Ly6Chi monocytes, comparing between COMMD10+ and COMMD10-deficient cells, revealed an increased differentiation bias of Ly6Chi monocytes towards NeuMo and LAM differentiation fates. Collectively, COMMD10 appears as an important regulator of Ly6Chi monocyte fate decisions and reparative behavior in the diseased liver.
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Project description:Hepatic macrophages play a central role in the initiation, progression and resolution of various liver diseases. Specifically, infiltrating Ly6Chi monocytes and their-derived macrophage (MoMFs) descendants prevail in acute or chronic liver injury, display marked transcriptional variance and provide crucial functional plasticity. A specific example of MoMFs are lipid associated macrophages (LAMs) involved in progression of metabolic liver disease (Remmerie et al., 2020). Recent studies have uncovered binary developmental trajectories of monocytes in the BM with Neutrophil-like (NeuMo) and dendritic cell (DC)-like (DCMo) monocytes (Weinreb et al., 2020; Yanez et al., 2017), hence further challenging our current comprehension of macrophage heterogeneity in the diseased liver. Yet, the molecular factors regulating their inflammatory versus restorative activity remains enigmatic. The COMMD (copper metabolism MURR1 domain) family includes 10 evolutionarily conserved proteins. Functions of COMMD proteins are still being defined, but they seem to play non-redundant roles in regulating transcription and protein trafficking. Utilizing conditional COMMD10 knockout mice we uncovered a role for COMMD10 in limiting inflammasome activation in Ly6Chi monocytes during experimental sepsis and colitis (Mouhadeb et al., 2018), and in supporting phagolysosomal biogenesis and maturation in KCs and BM-derived macrophages infected with Staphylococcus aureus (Ben Shlomo et al., 2019). Hence, these studies mark COMMD10 as a candidate mediator of monocyte and macrophage fate and immune responses. Here we studeis the effect of COMMD10-deficiency on Ly6Chi monocyte differentiation and inflammatory behaviour in the injured liver, using an acute model of acetaminophen-induced liver injury (AILI). Single cell RNAseq analysis of sorted Ly6Chi monocytes, comparing between COMMD10+ and COMMD10-deficient cells, revealed increased differentiation bias of Ly6Chi monocytes towards NeuMo and LAM differentiation fates. Collectively, COMMD10 appears as an important regulator of Ly6Chi monocyte fate decisions and reparative behavior in the diseased liver.
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