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• W2066840282 endingPage "e67496" @default.
• W2066840282 startingPage "e67496" @default.
• W2066840282 abstract "The mechanisms that control intracellular adhesion are central to the process of invasion and metastasis. Claudin-3 (CLDN3) and claudin-4 (CLDN4) are major structural molecules of the tight junctions that link epithelial cells. Our prior work has demonstrated that knockdown of the expression of either CLDN3 or CLDN4 produces marked changes in the phenotype of ovarian carcinoma cells including increases in growth rate in vivo, migration, invasion, metastasis, and drug resistance, similar to those produced by the epithelial-to-mesenchymal transition (EMT). We postulated that these changes may result from the ability of CLDN3 or CLDN4 to suppress EMT. In this study we found that knockdown of either CLDN3 or CLDN4 increased cell size and resulted in flattened morphology. While knockdown of CLDN3 or CLDN4 did not alter the expression of vimentin, it significantly down-regulated the level of E-cadherin and up-regulated N-cadherin expression. Conversely, over-expression of CLDN3 or CLDN4 in a cell line that does not express endogenous CLDN3 or CLDN4 decreased N-cadherin expression. Re-expression of E-cadherin in the CLDN3 or CLDN4 knockdown cells reduced migration, invasion and tumor growth in vivo. Loss of either CLDN3 or CLDN4 resulted in activation of the PI3K pathway as evidenced by increased Akt phosphorylation, elevated cellular PIP3 content and PI3K activity as well as up-regulation of the mRNA and protein levels of the transcription factor Twist. Taken together, these findings suggest that CLDN3 and CLDN4 function to sustain an epithelial phenotype and that their loss promotes EMT." @default.
• W2066840282 created "2016-06-24" @default.
• W2066840282 creator A5018596419 @default.
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• W2066840282 creator A5077821675 @default.
• W2066840282 creator A5085431984 @default.
• W2066840282 date "2013-06-21" @default.
• W2066840282 modified "2023-10-09" @default.
• W2066840282 title "Regulation of the Epithelial-Mesenchymal Transition by Claudin-3 and Claudin-4" @default.
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• W2066840282 doi "https://doi.org/10.1371/journal.pone.0067496" @default.
• W2066840282 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3689737" @default.
• W2066840282 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23805314" @default.
• W2066840282 hasPublicationYear "2013" @default.
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