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Updated: Oct 15, 2025
Induction and Analysis of Epithelial to Mesenchymal Transition
Published on: August 27, 2013
Proteomic and phosphoproteomic analyses identify liver-related signaling in retinal pigment epithelial cells during
Joseph L Mertz1, Srinivasa R Sripathi1, Xue Yang1
1Department of Ophthalmology, Stem Cell Ocular Regenerative Medicine Center, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
Abstract:
Epithelial-mesenchymal transition (EMT) of the retinal pigment epithelium (RPE) is associated with several blinding retinal diseases. Using proteomics and phosphoproteomics studies of human induced pluripotent stem cell-derived RPE monolayers with induced EMT, we capture kinase/phosphatase signaling cascades 1 h and 12 h after induction to better understand the pathways mediating RPE EMT. Induction by co-treatment with transforming growth factor β and tumor necrosis factor alpha (TGNF) or enzymatic dissociation perturbs signaling in many of the same pathways, with striking similarity in the respective phosphoproteomes at 1 h. Liver hyperplasia and hepatocyte growth factor (HGF)-MET signaling exhibit the highest overall enrichment. We also observe that HGF and epidermal growth factor signaling, two cooperative pathways inhibited by EMT induction, regulate the RPE transcriptional profile.
