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RNASeq profiles from two distinct F4/80+VCAM1+ sorted bone marrow populations are consistent with non-macrophage cells coated with macrophage fragments

ABSTRACT: RNASeq profiles from two distinct F4/80+VCAM1+ sorted bone marrow populations are consistent with non-macrophage cells coated with macrophage fragments

PROVIDER: PRJNA777345 | ENA |

REPOSITORIES: ENA

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RNASeq profiles from two distinct F4/80+VCAM1+ sorted bone marrow populations are consistent with non-macrophage cells coated with macrophage fragments

Project description:The objective of this study was to characterise macrophage subsets in bone marrow (BM) isolated from Csf1r-EGFP mice. A concurrent imaging flow cytometry study conducted by our team unexpectedly revealed macrophage surface marker staining emanates from membrane-bound subcellular remnants associated with unrelated cells. Expression data from sorted BM “macrophage” populations was found to be consistent with macrophage fragments associated with non-macrophage cells. Granulocyte-specific genes were enriched within the CD11b+ “macrophage” (CD11b+F4/80+Ly6G-GFPloVCAM1+) populations, whereas CD11b- “macrophages” (CD11b-F4/80+GFP+VCAM1+) were consistent with a mixed cell population including both plasma cells and erythroblasts. This data demonstrates how fragmentation of hematopoietic tissue macrophages can result in misattribution of macrophage identity to non-macrophage populations, thereby undermining accuracy of macrophage ex vivo molecular profiles.

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Project description:This experiment aims at comparing the transcriptomic profiles of two subpopulations of fetal human cardiac fibroblasts (HCF) defined by their relative expression of VCAM1. VCAM1-positive and VCAM1-negative populations were isolated from commercial fetal HCF by MACS against VCAM1. The RNA-seq procedure was outsourced to GENEWIZ (South Plainfield, NJ, USA), and subsequent analysis was performed in-house. Briefly, total mRNA was captured using the NEBNext Poly(A) mRNA Magnetic Isolation Module, and the library was constructed with the NEBNext Ultra RNA Library Prep Kit for Illumina. Sequencing was realized on an Illumina HiSeq 2500 System.

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Coated/Uncoated Tobacco Seeds

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Project description:In Alzheimer’s disease (AD), sensome receptor dysfunction impairs microglial danger-associated molecular pattern (DAMP) clearance and exacerbates disease pathology. While extrinsic signals including interleukin-33 (IL-33) can restore microglial DAMP clearance, it remains largely unclear how the sensome receptor(s) is regulated and interacts with DAMP during phagocytic clearance. Here, we show that IL-33 induces VCAM1 in microglia, which promotes microglial chemotaxis toward amyloid-beta (Aβ) plaque-associated ApoE, and leads to Aβ clearance. We show that IL-33 stimulates a chemotactic state in microglia, characterized by Aβ-directed migration. Functional screening identified that VCAM1 directs microglial Aβ chemotaxis by sensing Aβ plaque-associated ApoE. Moreover, we found that disrupting VCAM1–ApoE interaction abolishes microglial Aβ chemotaxis, resulting in decreased microglial clearance of Aβ. In patients with AD, higher cerebrospinal fluid levels of soluble VCAM1 were correlated with impaired microglial Aβ chemotaxis. Together, our findings demonstrate that promoting VCAM1–ApoE-dependent microglial functions ameliorates AD pathology.

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