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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 J+Biol+Chem
2017 ; 292
(27
): 11388-11399
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Knockdown of sodium-calcium exchanger 1 induces epithelial-to-mesenchymal
transition in kidney epithelial cells
#MMPMID28550085
J Biol Chem
2017[Jul]; 292
(27
): 11388-11399
PMID28550085
show ga
Mesenchymal-to-epithelial transition (MET) and epithelial-to-mesenchymal
transition (EMT) are important processes in kidney development. Failure to
undergo MET during development leads to the initiation of Wilms tumor, whereas
EMT contributes to the development of renal cell carcinomas (RCC). The role of
calcium regulators in governing these processes is becoming evident. We
demonstrated earlier that Na(+)/Ca(2+) exchanger 1 (NCX1), a major calcium
exporter in renal epithelial cells, regulates epithelial cell motility. Here, we
show for the first time that NCX1 mRNA and protein expression was down-regulated
in Wilms tumor and RCC. Knockdown of NCX1 in Madin-Darby canine kidney cells
induced fibroblastic morphology, increased intercellular junctional distance, and
induced paracellular permeability, loss of apico-basal polarity in 3D cultures,
and anchorage-independent growth, accompanied by expression of mesenchymal
markers. We also provide evidence that NCX1 interacts with and anchors E-cadherin
to the cell surface independent of NCX1 ion transport activity. Consistent with
destabilization of E-cadherin, NCX1 knockdown cells showed an increase in
?-catenin nuclear localization, enhanced transcriptional activity, and
up-regulation of downstream targets of the ?-catenin signaling pathway. Taken
together, knockdown of NCX1 in Madin-Darby canine kidney cells alters epithelial
morphology and characteristics by destabilization of E-cadherin and induction of
?-catenin signaling.