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GM-CSF Production by Non-Classical Monocytes Controls Antagonistic LPS-driven Functions In Allergic Inflammation

ABSTRACT: GM-CSF Production by Non-Classical Monocytes Controls Antagonistic LPS-driven Functions In Allergic Inflammation

PROVIDER: PRJNA773923 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16547727_1.fastq.gz	Fastqsanger.gz
	SRR16547727_2.fastq.gz	Fastqsanger.gz
	SRR16547728_1.fastq.gz	Fastqsanger.gz
	SRR16547728_2.fastq.gz	Fastqsanger.gz
	SRR16547729_1.fastq.gz	Fastqsanger.gz

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GM-CSF Production by Non-Classical Monocytes Controls Antagonistic LPS-driven Functions In Allergic Inflammation

Project description:Lipopolysaccharide (LPS) can either promote or prevent T helper-2 (Th2) cell-allergic responses. However, the underlying mechanism remains unknown. We show here that LPS activity switches from pro-pathogenic to protective depending on the production of GM-CSF by non-classical monocytes. In the absence of GM-CSF, LPS can favor pathogenic Th2 cell responses by supporting the trafficking of lung migratory dendritic cells (mDC2s) into the lung-draining lymph node. However, when non-classical monocytes produce GM-CSF, LPS and GM-CSF synergize to differentiate monocyte-derived DCs (moDCs) that instruct mDC2s for Th2 cell suppression. Importantly, only allergens with cysteine protease activity trigger GM-CSF production by non-classical monocytes. Hence, the therapeutic effect of LPS is restricted to allergens with this enzymatic activity. Treatment with GM-CSF, however, restores the protective effects of LPS. Thus, GM-CSF produced by non-classical monocytes acts as a rheostat that fine-tunes the pathogenic and therapeutic functions of LPS.

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Proteomic analysis of GM-CSF and M-CSF polarized bone marrow derived macrophages

Project description:Bone marrow cells were isolated, primed with M-CSF (M-BMDM) or GM-CSF (GM-BMDM) and cultured for 7 days. The proteomic difference between GM-BMDM and M-BMDM were analyzed to describe the phenotye and function of two types of macrophages.

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GM-CSF production by non-classical monocytes controls antagonistic LPS-driven functions in allergic inflammation.

Project description:Lipopolysaccharide (LPS) can either promote or prevent T helper 2 (Th2) cell allergic responses. However, the underlying mechanism remains unknown. We show here that LPS activity switches from pro-pathogenic to protective depending on the production of granulocyte-macrophage colony-stimulating factor (GM-CSF) by non-classical monocytes. In the absence of GM-CSF, LPS can favor pathogenic Th2 cell responses by supporting the trafficking of lung-migratory dendritic cells (mDC2s) into the lung-draining lymph node. However, when non-classical monocytes produce GM-CSF, LPS and GM-CSF synergize to differentiate monocyte-derived DCs from classical Ly6Chi monocytes that instruct mDC2s for Th2 cell suppression. Importantly, only allergens with cysteine protease activity trigger GM-CSF production by non-classical monocytes. Hence, the therapeutic effect of LPS is restricted to allergens with this enzymatic activity. Treatment with GM-CSF, however, restores the protective effects of LPS. Thus, GM-CSF produced by non-classical monocytes acts as a rheostat that fine-tunes the pathogenic and therapeutic functions of LPS.

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Project description:Human and murine studies showed that granulocyte macrophage colony-stimulating factor (GM-CSF) exerts beneficial effects in intestinal inflammation. To explore whether GM-CSF mediates its effects via monocytes, we analyzed effects of GM-CSF on monocytes in vitro and assessed the immunomodulatory potential of GM-CSF-activated monocytes (GMaM). We used microarray technology and functional assays to characterize GMaM in vitro and used a mouse model of colitis to study GMaM functions in vivo.

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Project description:Systemic GM-CSF promotes myelopoiesis and inflammation and GM-CSF blockade is being evaluated as treatment for COVID-19-associated hyperinflammation. Alveolar GM-CSF is however required for monocytes to differentiate into alveolar macrophages (AM) that control alveolar homeostasis and dampen inflammation. By mapping cross-species AM development stages to clinical lung samples, we discovered that COVID-19 is marked by defective GM-CSF-dependent AM instruction and accumulation of proinflammatory macrophages. In a multi-center, open-label, randomized, controlled trial in 81 non-ventilated COVID-19 patients with respiratory failure, we found that inhalation of rhu-GM-CSF did not improve mean oxygenation parameters compared with standard treatment. However, more patients on GM-CSF had a clinical response, and GM-CSF inhalation induced higher numbers of virus-specific CD8 effector lymphocytes and class-switched B cells, without exacerbating systemic hyperinflammation. This translational proof-of-concept study provides rationale for further testing of inhaled GM-CSF as non-invasive treatment to improve alveolar gas exchange and simultaneously boost anti-viral immunity in COVID-19

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