Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of human IMR-90 cells in response to TGF-I?1

ABSTRACT: Members of the NADPH oxidase (NOX) family of enzymes, which catalyze the reduction of O2 to reactive oxygen species, have increased in number during eukaryotic evolution. Seven isoforms of the NOX gene family have been identified in mammals; however, specific roles of NOX enzymes in mammalian physiology and pathophysiology have not been fully elucidated. The best established physiological role of NOX enzymes is in host defense against pathogen invasion in diverse species, including plants. The prototypical member of this family, NOX-2 (gp91phox), is expressed in phagocytic cells and mediates microbicidal activities. Here we report a role for the NOX4 isoform in tissue repair functions of myofibroblasts and fibrogenesis. Transforming growth factor-β1 (TGF-β1) induces NOX-4 expression in lung mesenchymal cells by a SMAD-3–dependent mechanism. NOX-4–dependent generation of hydrogen peroxide (H2O2) is required for TGF-β1–induced myofibroblast differentiation, extracellular matrix (ECM) production and contractility. NOX-4 is upregulated in lungs of mice subjected to noninfectious injury and in cases of human idiopathic pulmonary fibrosis (IPF). Genetic or pharmacologic targeting of NOX-4 abrogates fibrogenesis in two murine models of lung injury. These studies support a function for NOX4 in tissue fibrogenesis and provide proof of concept for therapeutic targeting of NOX-4 in recalcitrant fibrotic disorders. Experiment Overall Design: mRNA expression of genes in human fetal lung mesenchymal cells (IMR-90) treated with or without TGF-β1, as analyzed by Affymetrix (U133A) microarrays. Control (C0, C2, C3) = cells without TGF-β1 treatment (n=3). Experimental (T0, T5, T7) = cells treated with TGF-β1 (2ng/ml) (n=3). mRNA was collected for all 6 samples for 48 hours post treatment.

ORGANISM(S): Homo sapiens

SUBMITTER: Victor John Thannickal

PROVIDER: E-GEOD-17518 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Chronic liver injury promotes fibrosis, which can progress to cirrhosis, a major cause of morbidity and mortality worldwide. Resolving the cell-type-specific transcriptional changes orchestrating this transformation remains challenging. Recent advances in differentiation protocols allow the generation of multi-lineage human liver organoids (HLOs) from human pluripotent stem cells (hPSCs), providing a new model system to study evolving liver injury. We differentiated hPSCs into HLOs and defined optimal 3D culture conditions for liver injury induction. We modeled steatohepatitis through treatment with palmitic acid (PA) and fibrotic injury through treatment with transforming growth factor beta 1 (TGF-β1). For each injury type, we evaluated the development of fibrosis and inflammation by monitoring changes in morphology, gene expression, and histology. We then performed single-cell RNA-sequencing (scRNA-seq) to investigate cell-type diversity in healthy organoids at different time-points and to understand how TGF-β1- and PA-mediated injury affects each cell type. We observed transcriptional response signatures in injured HLOs to be both cell-type- and injury-specific. TGF-β1 treatment expanded hepatic stellate cell (HSC)-like populations and remodeled cell-cycle patterning. Gene set scoring revealed increased fibroblast activity with TGF-β1 treatment, while PA treatment was associated with inflammatory activity. Differential gene expression analysis at the subpopulation level showed induced profibrotic and extracellular matrix-remodeling pathways with TGF-β1 and non-alcoholic fatty liver disease (NAFLD) expression signatures with PA treatment. Evaluation of receptor and ligand expression defined hepatocyte-, cholangiocyte-, and HSC-like cell-cell interactions induced upon TGF-β1 treatment, an effect not observed with PA treatment. Tracing the changes at receptor-ligand pair resolution revealed specific COL1A1-Integrin complex interactions with TGF-β1 treatment and inflammation-specific interactions including CXCR7 and HLA-C with PA treatment. Treatment of HLOs with PA and TGF-β1 also demonstrated a sequential increase in expression of gene sets that predict clinical disease progression in non-alcoholic steatohepatitis (NASH). Our results demonstrate the applicability of hPSC-derived HLOs as a dynamic in vitro 3D human liver model system for the study of fibrotic and inflammatory liver injury.

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Transcription profiling of human IMR-90 cells in response to TGF-I?1

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