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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Invest+Ophthalmol+Vis+Sci
2016 ; 57
(13
): 5736-5747
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?-Catenin/CBP-Dependent Signaling Regulates TGF-?-Induced Epithelial to
Mesenchymal Transition of Lens Epithelial Cells
#MMPMID27787561
Taiyab A
; Korol A
; Deschamps PA
; West-Mays JA
Invest Ophthalmol Vis Sci
2016[Oct]; 57
(13
): 5736-5747
PMID27787561
show ga
PURPOSE: Transforming growth factor-?-induced epithelial-mesenchymal transition
(EMT) is one of the main causes of posterior capsular opacification (PCO) or
secondary cataract; however, the signaling events involved in TGF-?-induced PCO
have not been fully characterized. Here, we focus on examining the role of
?-catenin/cyclic AMP response element-binding protein (CREB)-binding protein
(CBP) and ?-catenin/T-cell factor (TCF)-dependent signaling in regulating
cytoskeletal dynamics during TGF-?-induced EMT in lens epithelial explants.
METHODS: Rat lens epithelial explants were cultured in medium M199 in the absence
of serum. Explants were treated with TGF-?2 in the presence or absence of the
?-catenin/CBP interaction inhibitor, ICG-001, or the ?-catenin/TCF interaction
inhibitor, PNU-74654. Western blot and immunofluorescence experiments were
carried out and analyzed. RESULTS: An increase in the expression of fascin, an
actin-bundling protein, was observed in the lens explants upon stimulation with
TGF-?, and colocalized with F-actin filaments. Inhibition of ?-catenin/CBP
interactions, but not ?-catenin/TCF interactions, led to a decrease in
TGF-?-induced fascin and stress fiber formation, as well as a decrease in the
expression of known markers of EMT, ?-smooth muscle actin (?-SMA) and matrix
metalloproteinase 9 (MMP9). In addition, inhibition of ?-catenin/CBP-dependent
signaling also prevented TGF-?-induced downregulation of epithelial cadherin
(E-cadherin) in lens explants. CONCLUSIONS: We show that ?-catenin/CBP-dependent
signaling regulates fascin, MMP9, and ?-SMA expression during TGF-?-induced EMT.
We demonstrate that ?-catenin/CBP-dependent signaling is crucial for
TGF-?-induced EMT in the lens.