Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Reversal of persistent wound-induced retinal pigmented epithelial-to-mesenchymal transition by the TGFb pathway inhibitor, A-83-01.

ABSTRACT: Age-related macular degeneration (AMD) is a leading cause of blindness. Most vision loss occurs following the transition from a disease of deposit formation and inflammation to a disease of neovascular fibrosis and/or cell death. Here, we investigate how repeated wound stimulus leads to seminal changes in gene expression and the onset of a perpetual state of stimulus-independent wound response in retinal pigmented epithelial (RPE) cells, a cell-type central to the etiology of AMD. Using a human fetal RPE cell culture model that considers monolayer disruption and subconfluent culture as a proxy for wound stimulus, we have shown that prolonged wound stimulus leads to terminal acquisition of a mesenchymal phenotype post-confluence and altered expression of more than 40% of the transcriptome (see GEO:GSE62224). In contrast, at subconfluence fewer than 5% of expressed transcripts have 2-fold or greater expression differences after repeated passage. Protein-protein and pathway interaction analysis of the genes with passage-dependent expression levels in subconfluent cultures reveals a 158-node interactome comprised of two interconnected modules with functions pertaining to wound response and cell division. Among the wound response genes are the TGFb pathway activators: TGFB1, TGFB2, INHBA, INHBB, GDF6, CTGF, and THBS1. Significantly, inhibition of TGFBR1/ACVR1B mediated signaling using receptor kinase inhibitors both forestalls and reverses the passage-dependent loss of epithelial potential. In this RNA-Seq based transcriptome analysis we show that the TGFb receptor kinase inhibitor, A-83-01, largely reverses the effects of passage and restores the transcriptome profile of Passage 4 RPE highly similar to that seen in differentiated Passage 0 RPE. Examination of mRNA expression in three different primary fetal RPE donor lines in 32 day old passage 0, passage 3, and passage 3 treated with 500 nM A-83-01 cultures

ORGANISM(S): Homo sapiens

SUBMITTER: Monte Radeke

PROVIDER: E-GEOD-67898 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Restoration of mesenchymal retinal pigmented epithelial cells by TGFβ pathway inhibitors: implications for age-related macular degeneration.

Radeke Monte J MJ Radeke Carolyn M CM Shih Ying-Hsuan YH Hu Jane J Bok Dean D Johnson Lincoln V LV Coffey Pete J PJ

Genome medicine 20150619 1

<h4>Background</h4>Age-related macular degeneration (AMD) is a leading cause of blindness. Most vision loss occurs following the transition from a disease of deposit formation and inflammation to a disease of neovascular fibrosis and/or cell death. Here, we investigate how repeated wound stimulus leads to seminal changes in gene expression and the onset of a perpetual state of stimulus-independent wound response in retinal pigmented epithelial (RPE) cells, a cell-type central to the etiology of ...[more]

PMID: 26150894

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Project description:Age-related macular degeneration (AMD) is a leading cause of blindness. Most vision loss occurs following the transition from a disease of deposit formation and inflammation to a disease of neovascular fibrosis and/or cell death. Here, we investigate how protracted wound stimulus leads to seminal changes in gene expression and the onset of a self-sustained state of wound response in retinal pigmented epithelial (RPE) cells. Using a human fetal RPE cell culture model and a systems level transcriptome analysis, we show that prolonged subconfluent culture resulting from repeated passage, leads to terminal acquisition of a mesenchymal-like phenotype post-confluence accompanied by altered expression of >40% of the transcriptome. In contrast, at subconfluence <5% of transcripts have >2-fold expression changes after repeated passage. Protein-protein interaction analysis reveals a core set of genes comprising two interconnected modules with functions pertaining to wound response and cell division. Among the wound response genes are the TGF-beta pathway activators: TGFB1, TGFG2, INHBA, INHBB, GDF6, CTGF, and THBS1. Small molecule inhibition of TGFBR1/ACVR1B mediated signaling both forestalls and reverses the passage-dependent loss of epithelial potential. Moreover, a disproportionate number of RPE wound response genes have altered expression in neovascular and geographic AMD; including key members of the TGF-beta pathway. In conclusiton, in RPE cells the switch to a terminal mesenchymal-like state following protracted or repeated wound stimulus is driven by activation of a self-perpetuating TGF-beta feedback loop. Targeted inhibition of TGF-beta signaling may be an effective approach towards retarding AMD progression and producing RPE cells in quantity for research and cell based therapies. Transcriptome profiles were determined from 44 human fetal RPE cultures of varying passage number, seeding density, culture maturity, and/or growth factor or small molecule treatment. Probes were labeled with Cy3 or Cy5 and Agilent whole genome microarrays were hybridized with a pair of Cy3 and Cy5 probes. After background subtraction and LOWESS correction to adjust for dye-dependent effects the net intensity values were determined as described in the Data Processing section and the entire data set was quantile normalized. The values reported in the Series Matrix are the quantile normalized net intensity values of the gene specific probes.

Dataset Information

Reversal of persistent wound-induced retinal pigmented epithelial-to-mesenchymal transition by the TGFb pathway inhibitor, A-83-01.

Publications

Restoration of mesenchymal retinal pigmented epithelial cells by TGFβ pathway inhibitors: implications for age-related macular degeneration.

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