| First Author | Manthey AL | Year | 2014 |
| Journal | Invest Ophthalmol Vis Sci | Volume | 55 |
| Issue | 8 | Pages | 5445-55 |
| PubMed ID | 25082886 | Mgi Jnum | J:230245 |
| Mgi Id | MGI:5755795 | Doi | 10.1167/iovs.14-14845 |
| Citation | Manthey AL, et al. (2014) The Zeb proteins deltaEF1 and Sip1 may have distinct functions in lens cells following cataract surgery. Invest Ophthalmol Vis Sci 55(8):5445-55 |
| abstractText | PURPOSE: Posterior capsular opacification (PCO), the most prevalent side effect of cataract surgery, occurs when residual lens epithelial cells (LECs) undergo fiber cell differentiation or epithelial-to-mesenchymal transition (EMT). Here, we used a murine cataract surgery model to investigate the role of the Zeb proteins, Smad interacting protein 1 (Sip1) and delta-crystallin enhancer-binding factor 1 (deltaEF1), during PCO. METHODS: Extracapsular extraction of lens fiber cells was performed on wild-type and Sip1 knockout mice. Protein expression patterns were assessed at multiple time points after surgery using confocal immunofluorescence. betaB1-Crystallin mRNA levels were measured using quantitative RT-PCR. We used Transfac searches to identify deltaEF1 binding sites in the betaB1-crystallin promoter and transfection analysis to test the ability of deltaEF1 to regulate betaB1-crystallin expression. RESULTS: deltaEF1, which, in other systems, can activate fibrotic genes (e.g., alpha-smooth muscle actin) and repress epithelial genes, upregulates by 48 hours after fiber cell removal. In culture, deltaEF1 repressed betaB1-crystallin promoter activity, suggesting that it may also turn off lens gene expression following surgery, contributing to "fibrotic PCO" development. Sip1 also upregulates in LECs by 48 hours, but analysis of Sip1 knockout lenses demonstrated that Sip1 does not play a major role in EMT or fiber cell differentiation after surgery. However, Sip1 knockout LECs do express the ectodermal marker keratin 8, suggesting that Sip1 may limit the reprogramming of residual LECs to an embryonic state. CONCLUSIONS: Zeb transcription factors likely play important, but distinct roles in PCO development after cataract surgery. |
