B cells and peritoneal macrophages RNA-seq
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA925426 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR23176420.fastq.gz | Fastqsanger.gz | |||
| SRR23176421.fastq.gz | Fastqsanger.gz | |||
| SRR23176422.fastq.gz | Fastqsanger.gz | |||
| SRR23176423.fastq.gz | Fastqsanger.gz | |||
| SRR23176424.fastq.gz | Fastqsanger.gz |
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Project description:The interaction of macrophages with apoptotic cells is required for efficient resolution of inflammation. While apoptotic cell removal prevents inflammation due to secondary necrosis, it also alters the macrophage phenotype to hinder further inflammatory reactions. The interaction between apoptotic cells and macrophages is often studied by chemical or biological induction of apoptosis, which may introduce artifacts by affecting the macrophages as well and/or triggering unrelated signaling pathways. Here, we set up a pure cell death system in which NIH 3T3 cells expressing dimerizable Caspase-8 were co-cultured with peritoneal macrophages in a transwell system. Phenotype changes in macrophages induced by apoptotic cells were evaluated by RNA sequencing, which revealed an unexpectedly dominant impact on macrophage proliferation. This was confirmed in functional assays with primary peritoneal macrophages and IC-21 macrophages. Moreover, inhibition of apoptosis during Zymosan-induced peritonitis in mice decreased mRNA levels of cell cycle mediators in peritoneal macrophages. Proliferation of macrophages in response to apoptotic cells may be important to increase macrophage numbers to allow efficient clearance and resolution of inflammation.
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Project description:Local factors produced in the tissue microenvironment play essential roles in promoting the ontogeny and phenotype of tissue resident macrophages (TRM). In the peritoneal cavity, large peritoneal macrophages (LPM) are the dominant TRMs that functionally mediate type 2 immunity, facilitate tissue repair of the mesothelium, and protect against peritoneal fibrosis. It is established that retinoic acid derived from the omentum induces transcription factor Gata6 expression in LPMs, which in turn regulates gene expression of factors that define peritoneal macrophages. It is still unclear whether retinoic acid is the sole local factor that regulates Gata6 expression in LPMs. Mesothelial cells line the entire peritoneal cavity and produce a protective, non-adhesive barrier against injury, at least in part by recruiting immune cells with secreted cytokines, such as M-CSF. We hypothesized that secreted factors from peritoneal mesothelial cells are also responsible for regulating LPM development including both ontogeny and function. Due to their immediate proximity to the peritoneal cavity, we propose that mesothelial cells can produce and secrete proteins into the peritoneum to maintain Gata6 expression by LPMs. To identify secreted factors that are highly and specifically expressed in mesothelial cells, we harvested primary mesothelial cells from 10-week-old C57BL/6 mice using FACS selection (CD45- PDPN+ GPM6a+). Total RNA was isolated from these cells and subjected to RNA-seq analysis after depletion of ribosomal RNA.
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