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2015 ; 16
(8
): 19170-83
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English Wikipedia
Cdc42-Interacting Protein 4 Represses E-Cadherin Expression by Promoting
?-Catenin Translocation to the Nucleus in Murine Renal Tubular Epithelial Cells
#MMPMID26287173
Xu C
; Zhou Q
; Liu L
; Liu P
; Pei G
; Zeng R
; Han M
; Xu G
Int J Mol Sci
2015[Aug]; 16
(8
): 19170-83
PMID26287173
show ga
Renal fibrosis is an inevitable outcome of end-stage chronic kidney disease.
During this process, epithelial cells lose E-cadherin expression. ?-Catenin may
act as a mediator by accumulation and translocation to the nucleus. Studies have
suggested that CIP4, a Cdc42 effector protein, is associated with ?-catenin.
However, whether CIP4 contributes to E-cadherin loss in epithelial cells by
regulating ?-catenin translocation is unclear. In this study, we investigated the
involvement of CIP4 in ?-catenin translocation. Expression of CIP4 was
upregulated in renal tissues of 5/6 nephrectomized rats and mainly distributed in
renal tubular epithelia. In TGF-?1-treated NRK-52E cells, upregulation of CIP4
expression was accompanied by reduced expression of E-cadherin. CIP4
overexpression promoted the translocation of ?-catenin to the nucleus, which was
accompanied by reduced expression of E-cadherin even without TGF-?1 stimulation.
In contrast, CIP4 depletion by using siRNA inhibited the translocation of
?-catenin to the nucleus and reversed the decrease in expression of E-cadherin.
The interaction between CIP4 and ?-catenin was detected. We also show that
?-catenin depletion could restore the expression of E-cadherin that was
suppressed by CIP4 overexpression. In conclusion, these results suggest that CIP4
overexpression represses E-cadherin expression by promoting ?-catenin
translocation to the nucleus.