The role of beta-catenin signaling in regulating barrier vs. non-barrier gene expression programs in circumventricular organ and ocular vasculatures
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA503625 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:The mammalian brain, spinal cord, and retina are supplied by capillaries that do not permit free diffusion of molecules between serum and parenchyma, a property that defines the blood-brain and blood-retina barriers. Exceptions to this pattern are found in the circumventricular organs (CVOs), a set of small midline brain structures that are supplied by high permeability capillaries. In the eye and brain, high permeability capillaries are also present in the choriocapillaris, which supplies the retinal pigment epithelium and photoreceptors, and the ciliary body and choroid plexus, the sources of aqueous humor and cerebrospinal fluid, respectively. We show here that endothelial cells in these vascular systems exhibit a low level of beta-catenin signaling. By elevating beta-catenin signaling in endothelial cells, these vasculatures can be partially converted to a barrier state. In one CVO, the area postrema, high permeability is maintained, in part, by local production of Wnt inhibitory factor-1.
2019-03-26 | GSE122117 | GEO
Project description:The brain, spinal cord, and retina are supplied by capillaries that do not permit free diffusion of molecules between serum and parenchyma, a property that defines the blood-brain and blood-retina barriers. Exceptions to this pattern are found in circumventricular organs (CVOs), small midline brain structures that are supplied by high permeability capillaries. In the eye and brain, high permeability capillaries are also present in the choriocapillaris, which supplies the retinal pigment epithelium and photoreceptors, and the ciliary body and choroid plexus, the sources of aqueous humor and cerebrospinal fluid, respectively. We show here that (1) endothelial cells in these high permeability vascular systems have very low beta-catenin signaling compared to barrier-competent endothelial cells, and (2) elevating beta-catenin signaling leads to a partial conversion of permeable endothelial cells to a barrier-type state. In one CVO, the area postrema, high permeability is maintained, in part, by local production of Wnt inhibitory factor-1.
| S-EPMC6443350 | biostudies-literature
Project description:The intestinal ecosystem is balanced by dynamic interactions between resident and incoming microbes, the gastrointestinal barrier, and the mucosal immune system. However, in the context of inflammatory bowel diseases (IBD) where the integrity of the gastrointestinal barrier is compromised, resident microbes contribute to the development and perpetuation of inflammation and disease. In this context, probiotic bacteria exert beneficial effects enhancing epithelial barrier integrity. However, the mechanisms underlying these beneficial effects are only poorly understood. Here, we comparatively investigated the effects of four probiotic lactobacilli, namely L. acidophilus, L. fermentum, L. gasseri, and L. rhamnosus in a T84 cell epithelial barrier model. Results of DNA-microarray experiments indicating that lactobacilli modulate the regulation of genes encoding in particular adherence junction proteins such as E-cadherin and b-catenin were confirmed by qRT-PCR. Furthermore, we show that epithelial barrier function is modulated by Gram-positive probiotic lactobacilli via their effect on adherence junction protein expression and complex formation. In addition, incubation with lactobacilli differentially influences the phosphorylation of adherence junction proteins and of PKC isoforms such as PKCd which thereby positively modulates epithelial barrier function. Further insight into the underlying molecular mechanisms triggered by these probiotics might also foster the development of novel strategies for the treatment of gastrointestinal diseases (e.g. IBD).
2012-02-10 | E-MEXP-3445 | biostudies-arrayexpress
Project description:Critical shortage of donor organs for treating end-stage organ failure highlights the urgent need for generating organs from induced pluripotent stem cells (hiPSCs). Despite many reports describing functional cell differentiation, no studies have succeeded in generating a three-dimensional vascularised organ such as liver. Here, we show the generation of vascularised and functional human liver from hiPSCs by transplantation of liver buds created in vitro (hiPSC-LBs). Specified hepatic cells self-organised into three-dimensional hiPSC-LBs by recapitulating organogenetic interactions between endothelial and mesenchymal cells. Immunostaining and gene expression analyses revealed resemblance between in vitro grown hiPSC-LBs and in vivo liver buds. Human vasculatures in hiPSC-LB transplants became functional by connecting to the host vessels within 48 hours. The formation of functional vasculatures stimulated the maturation of hiPSC-LBs into tissue resembling the adult liver. Highly metabolic hiPSC-derived tissue performed liver-specific functions such as protein production and human-specific drug metabolism without recipient liver replacement. Comparison of liver developmental gene signatures among hiPSC-LB, hFLC-LB, human adult (30 years old) liver tissues (hALT) and mouse liver tissue (mLT) of various developmental stages (E9.5~P8weeks).
2013-07-01 | E-GEOD-46631 | biostudies-arrayexpress
Project description:Sepsis is a life-threatening condition triggered by a dysregulated host response to microbial infection resulting in vascular dysfunction, organ failure and death. Here we provide a semi-quantitative atlas of the murine vascular cell-surface proteome at the organ level, and how it changes during sepsis. Using in-vivo chemical labeling, multi-dimensional liquid chromatography, and high-resolution mass spectrometry, we demonstrate the presence of a vascular proteome that is perfusable and shared across multiple organs. This proteome was enriched in membrane-anchored proteins, including multiple regulators of endothelial barrier functions and the innate immunity. Further, we automated our workflows and applied them to a murine model of methicillin-resistant Staphylococcus aureus sepsis to unravel changes during systemic inflammatory responses. We provide an organ-specific atlas of both systemic and local changes of the vascular proteome triggered by sepsis. The data indicates that upon a septic challenge, the different organ vasculatures undergo unique and extensive remodeling.
2019-04-15 | MSV000083690 | MassIVE
Project description:To investigate heterogeneity of murine nasal Prox1+ vasculatures, GFP+ cells from Prox1-GFP mouse nasal tissue were FACS sorted and single-cell RNA seq was performed
2022-07-12 | GSE207085 | GEO
Project description:Each organ of the human body requires locally-adapted blood vessels1–3. The gain of such organotypic vessel specializations is often deemed molecularly unrelated to the process of organ vascularization. Opposing this model, we reveal a molecular mechanism for brain-specific angiogenesis that operates under the control of Wnt7a/b ligands, well-known blood-brain barrier maturation signals4–6. The control mechanism relies on Wnt7a/b-dependent expression of Mmp25 in brain endothelial cells. This hitherto poorly characterized GPI-anchored matrix metalloproteinase is selectively required in endothelial tip cells to enable their initial migration across the pial basement membrane which lines the brain surface, and whose distinctive molecular composition is controlled by embryonic pial fibroblasts. Mechanistically, Mmp25 confers brain invasive competence by cleaving the pial basement membrane-enriched Col4a5/6 within a short non-collagenous region of the central helical part of the heterotrimer. Upon genetic interference with pial basement membrane composition, the Wnt/β-catenin-dependent organotypic control of brain angiogenesis is lost, resulting in a properly patterned, yet blood-brain barrier-defective cerebrovasculature. This work reveals an organ-specific angiogenesis mechanism, sheds light on tip cell mechanistic angiodiversity, and thereby illustrates how organs, by imposing local constraints on angiogenic tip cells, can select vessels matching their distinctive physiological requirements.
2024-02-08 | PXD042613 | Pride
Project description:To investigate heterogeneity of nasal environments and vasculatures, and their changes in allergic rhinitis (AR) model, nasal cells and endothelial cells (EC)s from Ctrl and AR model mouse were FACS sorted and single-cell RNA seqs were performed
2022-07-12 | GSE207084 | GEO
Project description:Critical shortage of donor organs for treating end-stage organ failure highlights the urgent need for generating organs from induced pluripotent stem cells (hiPSCs). Despite many reports describing functional cell differentiation, no studies have succeeded in generating a three-dimensional vascularised organ such as liver. Here, we show the generation of vascularised and functional human liver from hiPSCs by transplantation of liver buds created in vitro (hiPSC-LBs). Specified hepatic cells self-organised into three-dimensional hiPSC-LBs by recapitulating organogenetic interactions between endothelial and mesenchymal cells. Immunostaining and gene expression analyses revealed resemblance between in vitro grown hiPSC-LBs and in vivo liver buds. Human vasculatures in hiPSC-LB transplants became functional by connecting to the host vessels within 48 hours. The formation of functional vasculatures stimulated the maturation of hiPSC-LBs into tissue resembling the adult liver. Highly metabolic hiPSC-derived tissue performed liver-specific functions such as protein production and human-specific drug metabolism without recipient liver replacement.
2013-07-01 | GSE46631 | GEO
Project description:Interactions among neuroglial and vascular components are crucial for retinal angiogenesis and blood-retinal barrier (BRB) maturation. Neuronal synaptic dysfunctions precede vascular abnormalities in many retinal pathologies. However, whether neuronal activity, specifically glutamatergic activity, regulates retinal angiogenesis and BRB maturation remains unclear. Using in vivo genetic studies in mice, single-cell RNA-sequencing and functional validation, we found that deep plexus angiogenesis and paracellular BRB maturation are delayed in Vglut1-/- retinas, where neurons fail to release glutamate. In contrast, deep plexus angiogenesis and paracellular BRB maturation are accelerated in Gnat1-/- retinas, where constitutively depolarized rods release excess glutamate. Mechanistically, Norrin expression and endothelial Norrin/b-catenin signaling are downregulated in Vglut1-/- retinas, and upregulated in Gnat1-/- retinas. Pharmacological activation of endothelial Norrin/ b-catenin signaling in Vglut1-/- retinas rescued both deep plexus angiogenesis and paracellular BRB integrity. Thus, our findings demonstrate that glutamatergic neuronal activity regulates retinal angiogenesis and BRB maturation by modulating Norrin/b-catenin signaling.
2024-06-27 | GSE235993 | GEO