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2015 ; 6
(37
): 39493-506
Nephropedia Template TP
gab.com Text
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English Wikipedia
The redox sensitive glycogen synthase kinase 3? suppresses the self-protective
antioxidant response in podocytes upon oxidative glomerular injury
#MMPMID26567873
Li C
; Ge Y
; Peng A
; Gong R
Oncotarget
2015[Nov]; 6
(37
): 39493-506
PMID26567873
show ga
The redox sensitive glycogen synthase kinase (GSK) 3 has been recently implicated
in the pathogenesis of proteinuric glomerulopathy. However, prior studies are
less conclusive because they relied solely on chemical inhibitors of GSK3, which
provide poor discrimination between the isoforms of GSK3 apart from potential off
target activities. In murine kidneys, the ? rather than the ? isoform of GSK3 was
predominantly expressed in glomeruli and distributed intensely in podocytes. By
employing the doxycycline-activated Cre-loxP site specific gene targeting system,
GSK3? was successfully knocked out (KO) selectively in podocytes in adult mice,
resulting in a phenotype no different from control littermates. Electron
microscopy of glomeruli in KO mice demonstrated more glycogen accumulation in
podocytes but otherwise normal ultrastructures. Upon oxidative glomerular injury
induced by protein overload, KO mice excreted significantly less albuminuria and
had much attenuated podocytopathy and glomerular damage. The anti-proteinuric and
glomerular protective effect was concomitant with diminished accumulation of
reactive oxygen species in glomeruli in KO mice, which was likely secondary to a
reinforced Nrf2 antioxidant response in podocytes. Collectively, our data suggest
that GSK3? is dispensable for glomerular function and histology under normal
circumstances but may serve as a therapeutic target for protecting from oxidative
glomerular injuries.