Identification of Macrophage Genotype and Key Biological Pathways in Circulating Angiogenic Cell Transcriptome

Overview

Journal Stem Cells Int

Publisher Wiley

Specialty Cell Biology

Date 2019 Jun 14

PMID 31191690

Citations 2

Authors

Bert R Everaert

Steven J Van Laere

Robrecht Lembrechts

Vicky Y Hoymans

Jean-Pierre Timmermans

Christiaan J Vrints

Affiliations

Soon will be listed here.

Abstract

Background: Circulating angiogenic cells (CAC) have been identified as important regulators of vascular biology. However, there is still considerable debate about the genotype and function of CAC.

Methods And Results: Data from publicly available gene expression data sets were used to analyse the transcriptome of in vitro cultured CAC (CAC). Genes and pathways of interest were further evaluated using qPCR comparing CAC versus CD14 monocytic cells. The CAC transcriptome strongly related to tissue macrophages, and more specifically to regulatory M2c macrophages. The cytokine expression profile of CAC was predominantly immune modulatory and resembled the cytokine expression of tumor-associated macrophages (TAM). Pathway analysis revealed previously unrecognized biological processes in CAC, such as riboflavin metabolism and liver X receptor (LXR)/retinoid X receptor (RXR) and farnesoid X receptor (FXR)/retinoid X receptor (RXR) pathways. Analysis of endothelial-specific genes did not show evidence for endothelial transdifferentiation.

Conclusions: CAC are genotypically similar to regulatory M2c macrophages and lack signs of endothelial differentiation.

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