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2016 ; 6
(ä): 26226
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Cell-cell contact and matrix adhesion promote ?SMA expression during
TGF?1-induced epithelial-myofibroblast transition via Notch and MRTF-A
#MMPMID27194451
O'Connor JW
; Mistry K
; Detweiler D
; Wang C
; Gomez EW
Sci Rep
2016[May]; 6
(ä): 26226
PMID27194451
show ga
During epithelial-mesenchymal transition (EMT) epithelial cells lose cell-cell
adhesion, exhibit morphological changes, and upregulate the expression of
cytoskeletal proteins. Previous studies have demonstrated that complete
disruption of cell-cell contact can promote transforming growth factor
(TGF)-?1-induced EMT and the expression of the myofibroblast marker alpha smooth
muscle actin (?SMA). Furthermore, increased cell spreading mediates TGF?1-induced
?SMA expression during EMT. Here, we sought to examine how the presence of
partial cell-cell contacts impacts EMT. A microfabrication approach was employed
to decouple the effects of cell-cell contact and cell-matrix adhesion in
TGF?1-induced EMT. When cell spreading is controlled, the presence of partial
cell-cell contacts enhances expression of ?SMA. Moreover, cell spreading and
intercellular contacts together control the subcellular localization of activated
Notch1 and myocardin related transcription factor (MRTF)-A. Knockdown of Notch1
or MRTF-A as well as pharmacological inhibition of these pathways abates the
cell-cell contact mediated expression of ?SMA. These data suggest that the
interplay between cell-matrix adhesion and intercellular adhesion is an important
determinant for some aspects of TGF?1-induced EMT.