| First Author | Yamben IF | Year | 2013 |
| Journal | Dev Biol | Volume | 384 |
| Issue | 1 | Pages | 41-52 |
| PubMed ID | 24095903 | Mgi Jnum | J:204591 |
| Mgi Id | MGI:5532863 | Doi | 10.1016/j.ydbio.2013.09.027 |
| Citation | Yamben IF, et al. (2013) Scrib is required for epithelial cell identity and prevents epithelial to mesenchymal transition in the mouse. Dev Biol 384(1):41-52 |
| abstractText | The integrity and function of epithelial tissues depend on the establishment and maintenance of defining characteristics of epithelial cells, cell-cell adhesion and cell polarity. Disruption of these characteristics can lead to the loss of epithelial identity through a process called epithelial to mesenchymal transition (EMT), which can contribute to pathological conditions such as tissue fibrosis and invasive cancer. In invertebrates, the epithelial polarity gene scrib plays a critical role in establishing and maintaining cell adhesion and polarity. In this study we asked if the mouse homolog, Scrib, is required for establishment and/or maintenance of epithelial identity in vivo. To do so, we conditionally deleted Scrib in the head ectoderm tissue that gives rise to both the ocular lens and the corneal epithelium. Deletion of Scrib in the lens resulted in a change in epithelial cell shape from cuboidal to flattened and elongated. Early in the process, the cell adhesion protein, E-cadherin, and apical polarity protein, ZO-1, were downregulated and the myofibroblast protein, alphaSMA, was upregulated, suggesting EMT was occurring in the Scrib deficient lenses. Correlating temporally with the upregulation of alphaSMA, Smad3 and Smad4, TGFbeta signaling intermediates, accumulated in the nucleus and Snail, a TGFbeta target and transcriptional repressor of the gene encoding E-cadherin, was upregulated. Pax6, a lens epithelial transcription factor required to maintain lens epithelial cell identity also was downregulated. Loss of Scrib in the corneal epithelium also led to molecular changes consistent with EMT, suggesting that the effect of Scrib deficiency was not unique to the lens. Together, these data indicate that mammalian Scrib is required to maintain epithelial identity and that loss of Scrib can culminate in EMT, mediated, at least in part, through TGFbeta signaling. |
