"Alk1 acts in non-endothelial VE-cadherin+ perineurial cells to maintain nerve branching during hair homeostasis" and "Blood endothelial ALK1-BMP4 signaling axis regulates adult hair follicle stem cell activation"
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ABSTRACT:
PROVIDER: PRJNA870073 | ENA |
REPOSITORIES: ENA
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Project description:Purpose: To comprehensively characterize VE-cadherin expressing lineages during adult skin homeostasis, to dissect their population-specific transcriptomic heterogeneity, and to investigate role of Alk1 in these linegease in vivo. Methods: We performed 10x genomics single-cell RNA sequencing (scRNA-seq) of FACS sorted tdTomato+ cells from tdTomato;Cdh5-CreERT2;Krt14-H2BGFP mice (for WT) or Alk1 flox flox;tdTomato;Cdh5-CreERT2 (For Alk1KO) back skin at indicated stage/genotype. FACS purified tdTomato+ single-cell suspension was processed for the barcoded single-cell 3′ cDNA libraries generation using Chromium Single Cell 3′ gel bead and library Kit v3. The final libraries were quantified using Agilent Bioanalyzer high sensitivity DNA chip and sequenced using an Illumina NextSeq-500. The raw data files were demultiplexed to generate the sample-specific FASTQ files, which were aligned to the mouse reference genome (mm10-2020-A) using the 10x Genomics Cell Ranger pipeline (v6.0.1). The raw scRNA-seq data was processed using Cell Ranger from the 10x platform to generate expression matrix for each sample that was further analyzed in R using the Seurat package version 4.0. Only high-quality cells that had between 200 and 5000 genes expressed and had under 10% of the UMIs mapped to mitochondrial genes were retained for further analysis. Results: We obtained more than 2000 high quality cells at each stage/genotype for further analysis by Seurat pipeline Conclusions: Obtained high quality single cell transcriptomic data to dissect cellular and molecular heterogeneity of VE-cadherin expressing endothelial and non-endothelial lineages in adult mouse back skin.
2023-03-01 | GSE211381 | GEO
Project description:To investigate the gene expression changes in the hair follicle stem cells (bulge cells, HFSCs) after perturbing the vascular niche by knocking out Alk1 from the endothelial cells using Cdh5CreERT2 driver
2023-02-28 | GSE223723 | GEO
Project description:Blood endothelial Alk1-BMP4 signaling axis ensures adult hair follicle stem cell timely activation
| PRJNA927498 | ENA
Project description:Vascular endothelial (VE)-cadherin is a well-recognized endothelial cell marker. One of its interacting partners, the TGF-β receptor Alk1, is essential in endothelial cells for adult skin vasculature remodeling during hair homeostasis. Using single-cell transcriptomics, lineage tracing and gene targeting in mice, we characterize the cellular and molecular dynamics of skin VE-cadherin+ cells during hair homeostasis. We describe dynamic changes of VE-cadherin+ endothelial cells specific to blood and lymphatic vessels and uncover an atypical VE-cadherin+ cell population. The latter is not a predicted adult endovascular progenitor, but rather a non-endothelial mesenchymal perineurial cell type, which forms nerve encapsulating tubular structures that undergo remodeling during hair homeostasis. Alk1 acts in the VE-cadherin+ perineurial cells to maintain proper homeostatic nerve branching by enforcing basement membrane and extracellular matrix molecular signatures. Our work implicates the VE-cadherin/Alk1 duo, classically known as endothelial-vascular specific, in perineurial-nerve homeostasis. This has broad implications in vascular and nerve disease.
| S-EPMC10497554 | biostudies-literature
Project description:We generated recombinant human sVE-cadherin (extracellular domains EC1-5) which was applied to human dermal microvascular endothelial cells (HDMEC) to investigate it`s role in endothelial barrier function. In other experiments we observed that sVE-cadherin disrupted endothelial barrier function by dismantling the VE-cadherin complex at cell borders via VE-PTP-dependent RhoA activation. The sequencing project compares untreated HDMEC vs treated cells.
2025-10-01 | GSE210502 | GEO
Project description:Blood vessels can play dual roles in tissue growth by transporting gases and nutrients and by regulating tissue stem cell activity via signaling. Correlative evidence implicates skin endothelial cells (ECs) as signaling niches of hair follicle stem cells (HFSCs), but functional demonstration from gene depletion of signaling molecules in ECs is missing to date. Here, we show that depletion of the vasculature-factor Alk1 increases BMP4 secretion from ECs, which delays HFSC activation. Furthermore, while previous evidence suggests a lymphatic vessel role in adult HFSC activation possibly through tissue drainage, a blood vessel role has not yet been addressed. Genetic perturbation of the ALK1-BMP4 axis in all ECs or the lymphatic ECs specifically unveils inhibition of HFSC activation by blood vessels. Our work suggests a broader relevance of blood vessels, adding adult HFSCs to the EC functional repertoire as signaling niches for the adult stem cells.
| S-EPMC10183823 | biostudies-literature
Project description:Inhibition of VE-PTP, an endothelial receptor type tyrosine phosphatase, triggers phosphorylation of the tyrosine kinase receptor Tie-2, which leads to the suppression of inflammation-induced vascular permeability. Analyzing the underlying mechanism, we show here that inhibition of VE-PTP and activation of Tie-2 induce tyrosine phosphorylation of FGD5, a GTPase exchange factor (GEF) for Cdc42, and stimulate translocation of this GEF to cell contacts. Interfering with the expression of FGD5 blocked the junction stabilizing effect of VE-PTP inhibition in vitro and in vivo. Likewise, FGD5 was required for strengthening of cortical actin bundles and inhibiting radial stress fiber formation, which were each stimulated by VE-PTP inhibition. We identified Y820 of FGD5 as the direct substrate for VE-PTP. Inhibition of VE-PTP could no longer stabilize endothelial junctions or activate Cdc42 if endothelial cells expressed a Y820F point mutated version of FGD5. In contrast, FGD5-Y820F was still recruited to endothelial cell contacts. Thus, activation of FGD5 is a two-step process that comprises membrane recruitment and phosphorylation of Y820. These steps are necessary for the junction stabilizing effect that is stimulated by VE-PTP inhibition and Tie-2 activation.
2019-05-04 | PXD010959 | Pride
Project description:Blood vessels can play dual roles in tissue growth by transporting gases and nutrients and by regulating tissue stem cell activity via signaling. Correlative evidence implicates skin endothelial cells (ECs) as signaling niches of hair follicle stem cells (HFSCs), but functional demonstration from gene depletion of signaling molecules in ECs is missing to date. Here, we show that depletion of the vasculature-factor Alk1 increases BMP4 secretion from ECs, which delays HFSC activation. Furthermore, while previous evidence suggests a lymphatic vessel role in adult HFSC activation possibly through tissue drainage, a blood vessel role has not yet been addressed. Genetic perturbation of the ALK1-BMP4 axis in all ECs or the lymphatic ECs specifically unveils inhibition of HFSC activation by blood vessels. Our work suggests a broader relevance of blood vessels, adding adult HFSCs to the EC functional repertoire as signaling niches for the adult stem cells.
| S-SCDT-10_15252-EMBJ_2022112196 | biostudies-other
Project description:Rationale: The mechanistic foundation of vascular maturation is still largely unknown. Several human pathologies are characterized by deregulated angiogenesis and unstable blood vessels. Solid tumours, for instance, get their nourishment from newly formed structurally abnormal vessels which present wide and irregular inter-endothelial junctions. Expression and clustering of the main endothelial-specific adherens junction protein, vascular endothelial (VE)-cadherin (VEC), upregulate genes with key roles in endothelial differentiation and stability. Objective: We aim at understanding the molecular mechanisms through which VEC triggers the expression of a set of genes involved in endothelial differentiation and vascular stabilization. Methods and Results: We compared a VEC-null cell line with the same line reconstituted with VEC wild type cDNA. VEC expression and clustering upregulated endothelial-specific genes with key roles in vascular stabilization including claudin-5, Vascular Endothelial-Protein Tyrosine Phosphatase (VE-PTP) and von Willebrand factor (vWf). Mechanistically VEC exerts this effect by inhibiting Polycomb protein activity on the specific gene promoters. This is achieved by preventing nuclear translocation of FoxO1 and β-catenin, which contribute to Polycomb repressive complex-2 (PRC2) binding to promoter regions of claudin-5, VE-PTP and vWf. VE-cadherin/β-catenin complex also sequesters a core subunit of PRC2 (Ezh2) at the cell membrane, preventing its nuclear translocation. Inhibition of Ezh2/VE-cadherin association increases Ezh2 recruitment to claudin-5, VE-PTP and vWf promoters, causing gene downregulation. RNAseq comparison of VEC-null and VEC-positive cells suggested a more general role of VE-cadherin in activating endothelial genes and triggering a vascular stability-related gene expression program. In pathological angiogenesis of human ovarian carcinomas, reduced VEC expression paralleled decreased levels of Claudin-5 and VE-PTP. Conclusions: These data extend the knowledge of Polycomb-mediated regulation of gene expression to endothelial cell differentiation and vessel maturation. The identified mechanism opens novel therapeutic opportunities to modulate endothelial gene expression and induce vascular normalization through pharmacological inhibition of the Polycomb-mediated repression system. Keywords: Polycomb, endothelial cells, VE-cadherin, vessel maturation, vascular biology, vascular permeability, cell signalling, epigenetics, gene regulation. Downloaded from http://circres.ahajour Conclusions: These data extend the knowledge of Polycomb-mediated regulation of gene expression to endothelial cell differentiation and vessel maturation. The identified mechanism opens novel therapeutic opportunities to modulate endothelial gene expression and induce vascular normalization through pharmacological inhibition of the Polycomb-mediated repression system
2019-10-19 | GSE139092 | GEO
Project description:Soluble VE-cadherin disrupts endothelial barrier function via VE-PTP/RhoA signalling
| PRJNA865806 | ENA