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2014 ; 13
(19
): 3059-75
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Different effects of ZO-1, ZO-2 and ZO-3 silencing on kidney collecting duct
principal cell proliferation and adhesion
#MMPMID25486565
Qiao X
; Roth I
; Féraille E
; Hasler U
Cell Cycle
2014[]; 13
(19
): 3059-75
PMID25486565
show ga
Coordinated cell proliferation and ability to form intercellular seals are
essential features of epithelial tissue function. Tight junctions (TJs)
classically act as paracellular diffusion barriers. More recently, their role in
regulating epithelial cell proliferation in conjunction with scaffolding zonula
occludens (ZO) proteins has come to light. The kidney collecting duct (CD) is a
model of tight epithelium that displays intense proliferation during
embryogenesis followed by very low cell turnover in the adult kidney. Here, we
examined the influence of each ZO protein (ZO-1, -2 and -3) on CD cell
proliferation. We show that all 3 ZO proteins are strongly expressed in native CD
and are present at both intercellular junctions and nuclei of cultured CD
principal cells (mCCDcl1). Suppression of either ZO-1 or ZO-2 resulted in
increased G0/G1 retention in mCCDcl1 cells. ZO-2 suppression decreased cyclin D1
abundance while ZO-1 suppression was accompanied by increased nuclear p21
localization, the depletion of which restored cell cycle progression. Contrary to
ZO-1 and ZO-2, ZO-3 expression at intercellular junctions dramatically increased
with cell density and relied on the presence of ZO-1. ZO-3 depletion did not
affect cell cycle progression but increased cell detachment. This latter event
partly relied on increased nuclear cyclin D1 abundance and was associated with
altered ?1-integrin subcellular distribution and decreased occludin expression at
intercellular junctions. These data reveal diverging, but interconnected, roles
for each ZO protein in mCCDcl1 proliferation. While ZO-1 and ZO-2 participate in
cell cycle progression, ZO-3 is an important component of cell adhesion.