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  • Title: Proteomic and phosphoproteomic analyses identify liver-related signaling in retinal pigment epithelial cells during EMT.
    Author: Mertz JL, Sripathi SR, Yang X, Chen L, Esumi N, Zhang H, Zack DJ.
    Journal: Cell Rep; 2021 Oct 19; 37(3):109866. PubMed ID: 34686321.
    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.
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