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Different effects of ZO-1, ZO-2 and ZO-3 silencing on kidney collecting duct principal cell proliferation and adhesion

Roth-Monnay, Isabelle
Published in Cell Cycle. 2014, vol. 13, no. 19, p. 3059-75
Abstract 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 β1-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.
Keywords AnimalsCell AdhesionCell Cycle CheckpointsCell ProliferationCellsCulturedCyclin D1/metabolismCyclin-Dependent Kinase Inhibitor p21/metabolismKidney TubulesCollecting/cytology/metabolismProliferating Cell Nuclear Antigen/metabolismRNA InterferenceRNAMessenger/metabolismRNASmall Interfering/metabolismRatsRatsSprague-DawleyZonula Occludens Proteins/antagonists & inhibitors/genetics/metabolismZonula Occludens-1 Protein/antagonists & inhibitors/genetics/metabolismZonula Occludens-2 Protein/antagonists & inhibitors/genetics/metabolism
PMID: 25486565
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Article (Published version) (1.6 MB) - document accessible for UNIGE members only Limited access to UNIGE
Research group Laboratoire de physiologie et pathophysiologie des cellules rénales (29)
FNS: 31003A_156736/1
Autre: NCCR Kidney.ch
(ISO format)
QIAO, Xiaomu et al. Different effects of ZO-1, ZO-2 and ZO-3 silencing on kidney collecting duct principal cell proliferation and adhesion. In: Cell Cycle, 2014, vol. 13, n° 19, p. 3059-75. doi: 10.4161/15384101.2014.949091 https://archive-ouverte.unige.ch/unige:98790

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Deposited on : 2017-11-08

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