Similar Datasets
Project description:ABCB5 is marker for Limbal epithilal stem cells. A comparison between ABCB5+ versus ABCB5- cultured human limbal epithelial cells was carried out to evaluate the properties of the limbal stem cell ABCB5+ with a special focus on their role in inflammation and angiogenesis.
2023-10-24 | PXD041004 | Pride
Project description:Single cell RNA-seq of human ABCB5-positive limbal stem cells
| PRJNA658246 | ENA
Project description:Expression data from ABCB5-positive and ABCB5-negative GBM cells
| PRJNA525717 | ENA
Project description:We analyzed, by HTA 2.0, the GBM cell lines LN-18, LN-229, and U-87 MG after fluoresence-activated cell sorting (FACS) into ABCB5+ and ABCB5- fractions. Poor prognosis associated with glioblastoma multiforme (GBM) results from tumor resistance to therapy and high rate of recurrence. Compelling evidence suggests this is driven by subpopulations of slow-proliferating cancer stem cells with tumor-initiating potential. ATP-binding cassette member B5 (ABCB5) has been identified as a molecular marker for distinct subsets of chemoresistant tumor-initiating cell populations in diverse human malignancies. In the current study, we examined the potential role of ABCB5 in growth and chemoresistance of GBM. We found ABCB5 to be preferentially expressed in clinical GBM tumors and co-expressed with the stem cell marker CD133 in subpopulations of human GBM cell lines U-87 MG, LN-18 and LN-229. Antibody-mediated functional ABCB5 blockade inhibited proliferation and survival of human GBM cells and sensitized them to temozolomide (TMZ)-induced apoptosis. Likewise, in an in vivo GBM xenograft study in immunodeficient mice, anti-ABCB5 monoclonal antibody treatment inhibited tumor growth and sensitized tumors to TMZ therapy. Mechanistically, we demonstrated that ABCB5 regulates cell cycle checkpoint molecules to revoke drug-induced G2-M arrest and augments drug-mediated cell death. Overall, our data establish ABCB5 as a marker of GBM chemoresistance and point to the potential of ABCB5 targeting in improvement of current GBM therapies.
2020-03-05 | GSE127895 | GEO
Project description:Limbal stem cells (LSCs), known as corneal epithelial stem cells, are located at the basal epithelial layer of the corneal limbus and serve an important function in maintaining the homeostasis of the corneal epithelium. Several putative molecular markers of LSCs have been previously identified. However, the specificity of these markers remains largely controversial. To address this gap in the current understanding of LSCs, we performed a transcriptome profiling of heterogeneous corneal limbal basal cells using single-cell transcriptomics technology to identify LSCs and their exclusive markers. We isolated limbal basal cells from two young donors, constructed scRNA-seq libraries, generated RNA-sequencing data using the 10x Genomics platform, and then finally obtained the transcriptome of about 18,000 individual single-cells using Cell ranger (https://10xgenomics.com). Next, we performed quality control, filtering and data integration using Seurat package (https://satijalab.org/seurat), about 16,400 cells were retained for further downstream analysis such as dimensional reduction, unsupervised clustering, and Differentially expressed gene selection, trajectory analysis and visualization. We identified 11 unique clusters of cells assigned to a putative cell type based on published known biomarkers for differentiation, proliferation and putative epithelial stem cells. As a results, we found 2 Terminally Differentiated Cell (TDC), 3 Post-Mitotic Cell (PMC), 1 Transient Amplifying Cell (TAC), 2 Limbal Progenitor Cell (LPC), Putative Limbal Stem Cell (LSC) and 2 Melanocyte (MC) sub-cell type clusters. Furthermore, we confirmed the trajectory order of LSC differentiation for 9 clusters using Pseudotemporal and Functional PCA analysis. Lastly, we validated each assigned cell subtypes and determined their location in human corneal limbus tissue with 9 markers using RNAscope We were able to reveal the heterogeneity of corneal limbal basal epithelium by defining novel dynamic trajectories for cell types in a pseudotemporal manner. This approach allowed us to identify the distinct clusters of LSCs and progenitors with exclusively expressed markers, and might apply for translational research on regenerating a normal corneal epithelium and restoring vision.
2021-01-14 | GSE153515 | GEO
Project description:The rapid and effective regeneration of corneal epithelial cells depends on limbal stem cells (LSCs). The LSCs of mouse can be subdivided into quiescent LSCs (located on the outer limbus, qLSCs) and active LSCs (located on the inner limbus, aLSCs). Here, we used single-cell RNA sequencing to decipher the transcriptional changes in qLSCs and aLSCs and their niche regulations during the corneal wound healing, and reconstructed the pseudotime trajectory and differentiation of LSCs. Our comparative study identified a transcription factor Creb5, expressed in LSCs, that was significantly upregulated after corneal epithelial injury, and the loss-of-function experiments revealed that silencing Creb5 delayed the corneal epithelial healing. Besides, we predicted a significant increase in the number of ligand-receptor pairs for intercellular communications during corneal epithelial wound healing, especially between immune cells and LSCs, implying the participation of various niche cells in limbal stem cell kinetics during corneal epithelial regeneration. Overall, our research reveals numerous findings on the behavior and functionality of LSCs during corneal wound healing, providing reference for the discovery of mechanisms and potential clinical interventions of ocular surface reconstruction.
2024-07-10 | GSE247392 | GEO
Project description:To evaluate the potential impact of multiple passaging on the homogeneity of ex vivo-expanded, GMP-manufactured human skin-derived ABCB5+ mesenchymal stem cells, comparative gene expression profile analysis on cells from various passages was employed.
2020-02-21 | GSE145589 | GEO
Project description:Cancer stem cells (CSC) responsible for disease progression and therapeutic resistance have been identified in several human malignancies, including colorectal cancer (CRC). However, the molecular mechanisms through which CSC drive tumor growth are incompletely understood. ABCB5, a member of the ATP-binding cassette superfamily of active transporters, serves as a CSC-specific multidrug resistance mechanism in diverse human malignancies. Additionally, ABCB5 has recently been demonstrated to function as an anti-apoptotic gene in tissue-specific non-malignant stem cells. Here we demonstrate that ABCB5 also serves an anti-apoptotic role required for CSC maintenance in human cancer. Targeted inhibition of ABCB5, previously shown to be preferentially expressed on CD133-positive CRC stem cells, induced tumor cell apoptosis in vitro and in vivo and inhibited human CRC growth in NSG recipient mice. Mechanistically, ABCB5-positive tumor cell ablation through monoclonal antibody-mediated blockade or shRNA-mediated gene knockdown resulted in diminished production of the receptor tyrosine kinase AXL, a pro-tumorigenic molecule identified herein to be preferentially produced by CRC stem cells. Restoration of AXL expression through gene transfection in ABCB5 knockdown tumors partially restored tumor growth, demonstrating that ABCB5-positive CRC stem cells drive tumorigenicity at least in part through production of AXL. Our results establish a novel anti-apoptotic function of ABCB5 in human cancer and indicate that targeted blockade of ABCB5 represents a novel strategy for CSC eradication, independent of its previously established function as a multidrug resistance mediator.
2018-08-01 | GSE71670 | GEO
Project description:Functional analysis of ABCB5 in A375 and G3361 melanoma cells, by comparing stably-transfected controls to ABCB5-shRNA-targeted cells. 12 samples total. Replicates n=3 for the following 4 groups: A375 pSUPER-retro-puro-Vector vs. A375 pSUPER-retro-puro-ABCB5-KD; G3361 pSUPER-retro-puro-shCNTRL vs. G3361 pSUPER-retro-puro-ABCB5-KD.
2014-06-17 | E-GEOD-38290 | biostudies-arrayexpress
Project description:Comprehensive transcriptome analysis of four distinct human limbal compartments, including basal limbal crypts (BLCs), superficial limbal crypts (SLCs), cornea, and the supporting stroma, with the aid of laser capture microdissection and deep RNA sequencing.
2013-07-01 | E-MTAB-1498 | biostudies-arrayexpress