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Differential gene expression of TLR7 overexpressing inflammatory hemophagocytes, Ly6Chi Monocytes, and Red Pulp Macrophages

ABSTRACT: Differential gene expression of TLR7 overexpressing inflammatory hemophagocytes, Ly6Chi Monocytes, and Red Pulp Macrophages

PROVIDER: PRJNA483011 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7608080.fastq.gz	Fastqsanger.gz
	SRR7608090.fastq.gz	Fastqsanger.gz
	SRR7608100.fastq.gz	Fastqsanger.gz
	SRR7608081.fastq.gz	Fastqsanger.gz
	SRR7608091.fastq.gz	Fastqsanger.gz

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Differential gene expression of TLR7 overexpressing inflammatory hemophagocytes, Ly6Chi Monocytes, and Red Pulp Macrophages

Project description:We have defined a novel population of monocyte-derived hemophagocytes (inflammatory hemophagocytes (iHPC)) found in situations of inflammation, such as TLR7.1 mice that overexpress TLR7. These iHPC are similar yet distinct from red pulp macrophages (RPM) and differentiate in response to chronic TLR7 signals. In vivo, iHPC phagocytose red blood cells and platelets causing anemia and thrombocytopenia. We performed this study to further understand iHPC and their relationship to RPM and monocytes and determine what gene signatures make them unique.

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Gene expression analysis of neutrophils, Ym1+Ly6Chi monocytes and Ym1-Ly6Chi monocytes

Project description:mRNA expression profiles between Ym1+Ly6Chi monocytes and Ym1-Ly6Chi monocytes from LPS-treated mice were analyzed by RNA-sequencing

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Project description:Gene expression analysis of neutrophils, Ym1+Ly6Chi monocytes and Ym1-Ly6Chi monocytes

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Transcription factor C/EBP⍺ is required for the development of Ly6Chi monocytes but not Ly6Clo monocytes

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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Treatment of human monocytes with TLR7 or TLR8 agonists

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Genome-wide analysis of tissue-specific gene expression by Ly6Chi inflammatory monocytes during Toxoplasma gondii infection

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. Ly6Chi inflammatory monocytes were sorted by FACS from the blood or small intestine lamina propria (SILP) of Toxoplasma gondii infected C57BL/6 mice. Cells were isolated at day 8 after infection and total RNA obtained from sorted populations. Three biological replicates were acquired for both blood and SILP from pooled animals.

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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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