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2018 ; 9
(3
): 342
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Podocyte-specific Rac1 deficiency ameliorates podocyte damage and proteinuria in
STZ-induced diabetic nephropathy in mice
#MMPMID29497040
Lv Z
; Hu M
; Fan M
; Li X
; Lin J
; Zhen J
; Wang Z
; Jin H
; Wang R
Cell Death Dis
2018[Mar]; 9
(3
): 342
PMID29497040
show ga
Activation of Ras-related C3 botulinum toxin substrate 1 (Rac1) has been
implicated in diverse kidney diseases, yet its in vivo significance in diabetic
nephropathy (DN) is largely unknown. In the present study, we demonstrated a
podocyte-specific Rac1-deficient mouse strain and showed that specific inhibition
of Rac1 was able to attenuate diabetic podocyte injury and proteinuria by the
blockade of Rac1/PAK1/p38/?-catenin signaling cascade, which reinstated the
integrity of podocyte slit diaphragms (SD), rectified the effacement of foot
processes (FPs), and prevented the dedifferentiation of podocytes. In vitro, we
showed Rac1/PAK1 physically bound to ?-catenin and had a direct phosphorylation
modification on its C-terminal Ser675, leading to less ubiquitylated ?-catenin,
namely more stabilized ?-catenin, and its nuclear migration under high-glucose
conditions; further, p38 activation might be responsible for ?-catenin nuclear
accumulation via potentiating myocyte-specific enhancer factor 2C (MEF2c)
phosphorylation. These findings provided evidence for a potential renoprotective
and therapeutic strategy of cell-specific Rac1 deficiency for DN and other
proteinuric diseases.