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- W2085304489 abstract "Neoplastic transformation by oncogenes such as activated Src is known to suppress gap junctional, intercellular communication (GJIC). One of the Src effector pathways leading to GJIC suppression and transformation is the Ras/Raf/Mek/Erk, so that inhibition of this pathway in vSrc-transformed cells restores GJIC. A distinct Src downstream effector required for neoplasia is the signal transducer and activator of transcription-3 (Stat3). To examine the role of Stat3 upon the Src-mediated, GJIC suppression, Stat3 was downregulated in rat liver epithelial cells expressing activated Src through treatment with the CPA7, Stat3 inhibitor, or through infection with a retroviral vector expressing a Stat3-specific shRNA. GJIC was examined by electroporating the fluorescent dye, Lucifer yellow, into cells grown on two coplanar electrodes of electrically conductive, optically transparent, indium-tin oxide, followed by observation of the migration of the dye to the adjacent, nonelectroporated cells under fluorescence illumination. The results demonstrate that, contrary to inhibition of the Ras pathway, Stat3 inhibition in cells expressing activated Src does not restore GJIC. On the contrary, Stat3 inhibition in normal cells with high GJIC levels eliminated junctional permeability. Therefore, Stat3's function is actually required for the maintenance of junctional permeability, although Stat3 generally promotes growth and in an activated form can act as an oncogene." @default.
- W2085304489 created "2016-06-24" @default.
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- W2085304489 date "2009-07-01" @default.
- W2085304489 modified "2023-10-18" @default.
- W2085304489 title "Stat3 Activity Is Required for Gap Junctional Permeability in Normal Rat Liver Epithelial Cells" @default.
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- W2085304489 doi "https://doi.org/10.1089/dna.2008.0833" @default.
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