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Monocytes transition to monocyte-macrophages within the inflamed vasculature via CCR2 on monocytes and endothelial TNFR2

ABSTRACT: Monocytes transition to monocyte-macrophages within the inflamed vasculature via CCR2 on monocytes and endothelial TNFR2

PROVIDER: PRJNA807800 | ENA |

REPOSITORIES: ENA

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Monocytes transition to monocyte-macrophages within the inflamed vasculature via CCR2 on monocytes and endothelial TNFR2

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Monocytes transition to monocyte-macrophages within the inflamed vasculature via CCR2 on monocytes and endothelial TNFR2

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Monocytes transition to monocyte-macrophages within the inflamed vasculature via CCR2 on monocytes and endothelial TNFR2

Project description:Monocytes transition to monocyte-macrophages within the inflamed vasculature via CCR2 on monocytes and endothelial TNFR2

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Transcriptome comparison between CCR2+ and CCR2- classical monocytes in SIV-infected Macaca nemestrina

Project description:Monocytes have been categorized in three main subpopulations based on CD14 and CD16 surface expression. Classical monocytes are the most abundant subset in the blood. They express a CD14+CD16-CCR2+ phenotype, which confers on them the ability to migrate to inflammatory sites by quickly responding to CCL2 signaling. Here we identified and characterized the surge and expansion of a novel monocyte subset during SIV and HIV infection. They were undistinguishable from classical monocytes regarding CD14 and CD16 expression, but did not express surface CCR2. Transcriptome analysis of sorted cells confirmed that they represent a distinct subpopulation that expresses lower levels of inflammatory cytokines and activation markers than their CCR2+ counterparts. They exhibited impaired phagocytosis and deficient chemotaxis in response to CCL2 and CCL7, besides being refractory to SIV infection. We named these cells atypical CCR2- classical (ACC) monocytes, and believe they play an important role in AIDS pathogenesis, possibly reflecting an anti-inflammatory response against the extreme immune activation observed during SIV and HIV infection. Antiretroviral therapy caused this population to decline in both macaque and human subjects, suggesting that this atypical phenotype may be induced by viral replication. Expression profiling by NanoString nCounter gene expression system. Classical monocytes (CD14++CD16-) from six SIV-infected macaques (day 14 post inoculation) were sorted in two groups according to CCR2 expression.

2012-03-01 | E-GEOD-27559 | biostudies-arrayexpress

Transcriptome comparison between CCR2+ and CCR2- classical monocytes in SIV-infected Macaca nemestrina

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Transcriptomic profiling of lung monocytes and macrophages in mice

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 Âµg CpG-DNA intratracheally.

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