Transcriptional and accessible chromatin profiles during conversion process of alternatively activated macrophages (RNA-Seq)
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE95002 | GEO | 2017/04/24
SECONDARY ACCESSION(S): PRJNA375115
REPOSITORIES: GEO
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Project description:Macrophages adopt an alternatively activated phenotype (AAM) when activated by IL-4. While these AAMs can be derived from local proliferation of resident tissue macrophages or recruited inflammatory monocytes, it is not known whether these different AAMs are phenotypically and functionally distinct. Using microarray analysis of gene expression, we demonstrated that while both monocyte- and tissue-derived AAM expressed high levels of Arg1, Chi3l3 and Retnla, only monocyte-derived AAM upregulated Raldh2 and PD-L2. The distinction between monocyte- and tissue-derived macrophages can, therefore, be made using different phenotypic markers.
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Project description:Mononuclear phagocytes promote injury and repair following myocardial infarction but discriminating functions within mixed populations remains challenging. We utilized fate mapping and single cell RNA-sequencing to delineate fate specification trajectories of heterogeneous cardiac macrophage subpopulations. In steady state, TIMD4 expression tracked with a dominant resident cardiac macrophage subset that persisted via in situ self-renewal with minimal monocyte input. Following ischemic injury, monocytes displayed significant plasticity, ultimately adopting transcriptional states similar to resident macrophages, but also multiple unique states. Ischemic injury reduced resident macrophage abundance within infarct tissue, and despite transcriptional similarity, TIMD4 expression distinguished resident from recruited macrophages. Specific lineage-based depletion of resident cardiac macrophages resulted in depressed cardiac function and adverse remodeling primarily within the peri-infarct zone, the only region of the myocardium where resident macrophages expanded numerically following injury. Together, these data highlight a non-redundant, cardioprotective role of resident cardiac macrophages, and the diverse transcriptional fates recruited monocytes can adopt.
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Project description:Tissue-resident macrophages have an embryonic origin, but are replenished under steady state conditions in some tissues by blood monocytes that can adopt genotypic and phenotypic features of the residents. However, little is known about the residency and functional properties of infiltrating macrophages after an inflammatory challenge. The meninges of the central nervous system (CNS) are populated by a dense network of specialized macrophages that act as resident immune sentinels. Here we show that following lymphocytic choriomeningitis virus infection resident meningeal macrophages become activated by innate inflammatory cytokines, acquire viral antigen, and interact directly with infiltrating cytotoxic T lymphocytes (CTL), which leads to their depletion. Concurrently, the meninges are heavily infiltrated by peripherally-derived inflammatory monocytes that engraft the meningeal niche and remain in situ for months after viral clearance. This engraftment leads to phenotypic and functional changes in the pool of resident meningeal macrophages that depends in part on IFNγ signaling. These changes include loss of bacterial and immunoregulatory sensors that impede subsequent CNS immune reactions. Collectively, these data indicate that peripheral monocytes can engraft the meninges after an inflammatory challenge, imprinting the compartment with long-term defects in immune function.
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