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2016 ; 14
(5
): 4091-4098
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Glycogen synthase kinase?3? is required for epithelial?mesenchymal transition and
barrier dysfunction in mouse podocytes under high glucose conditions
#MMPMID27748847
Guo J
; Yang L
; Qiao Y
; Liu Z
Mol Med Rep
2016[Nov]; 14
(5
): 4091-4098
PMID27748847
show ga
Epithelial-mesenchymal transition (EMT) is important for diabetic nephropathy
(DN). Podocytes are specialized epithelial cells, which form a major component of
the glomerular filtration barrier. Podocyte damage has been suggested to be the
primary mechanism behind the albuminuria associated with DN. The present study
aimed to determine the function of glycogen synthase kinase (GSK)?3? in EMT and
barrier dysfunction of mouse podocytes exposed to high glucose (HG) conditions.
Matured and differentiated podocytes were treated with normal glucose (NG), HG or
NG + mannitol. Podocytes were also transfected with a small interfering RNA
(siRNA) against GSK?3? or a scrambled siRNA, or were treated with lithium
chloride (LiCl), a GSK?3? inhibitor, under NG or HG conditions. The expression
levels of the epithelial cell markers, nephrin and podocin, and the myofibroblast
cell markers, ??smooth muscle actin (SMA) and fibronectin, in podocytes by
western blot analysis and immunofluorescence staining, respectively. The
monolayer barrier function was assessed by albumin inflow. The phosphorylation
and activity levels of GSK?3? were also quantified. It was observed that HG
promotes EMT in podocytes, due to the increased levels of podocin and nephrin
expression and the reduced ??SMA and fibronectin expression levels. HG also
induced barrier dysfunction and increased the expression level of total GSK?3?,
Try216?phosphorylated?GSK?3? and the GSK?3? activity in podocytes. Transfection
of GSK?3? siRNA or treatment with LiCl reversed the HG?induced EMT and barrier
dysfunction in podocytes. In conclusion, the present study determined that GSK?3?
is required for EMT and barrier dysfunction in podocytes under HG conditions;
therefore, GSK?3? may be a novel target for the treatment of DN.