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Renal Integrin-Linked Kinase Depletion Induces Kidney cGMP-Axis Upregulation:
Consequences on Basal and Acutely Damaged Renal Function
#MMPMID26562149
Cano-Peñalver JL
; Griera M
; García-Jerez A
; Hatem-Vaquero M
; Ruiz-Torres MP
; Rodríguez-Puyol D
; Frutos S
; Rodríguez-Puyol M
Mol Med
2016[Mar]; 21
(1
): 873-885
PMID26562149
show ga
Soluble guanylyl cyclase (sGC) is activated by nitric oxide (NO) and produces
cGMP, which activates cGMP-dependent protein kinases (PKG) and is hydrolyzed by
specific phosphodiesterases (PDE). The vasodilatory and cytoprotective capacity
of cGMP-axis activation results in a therapeutic strategy for several
pathologies. Integrin-linked kinase (ILK), a major scaffold protein between the
extracellular matrix and intracellular signaling pathways, may modulate the
expression and functionality of the cGMP-axis-related proteins. We introduce ILK
as a novel modulator in renal homeostasis as well as a potential target for
cisplatin (CIS)-induced acute kidney injury (AKI) improvement. We used an adult
mice model of depletion of ILK (cKD-ILK), which showed basal increase of sGC and
PKG expressions and activities in renal cortex when compared with wildtype (WT)
littermates. Twenty-four h activation of sGC activation with NO enhanced the
filtration rate in cKD-ILK. During AKI, cKD-ILK maintained the cGMP-axis
upregulation with consequent filtration rates enhancement and ameliorated
CIS-dependent tubular epithelial-to-mesenchymal transition and inflammation and
markers. To emphasize the role of cGMP-axis upregulation due to ILK depletion, we
modulated the cGMP axis under AKI in vivo and in renal cultured cells. A
suboptimal dose of the PDE inhibitor ZAP enhanced the beneficial effects of the
ILK depletion in AKI mice. On the other hand, CIS increased contractility-related
events in cultured glomerular mesangial cells and necrosis rates in cultured
tubular cells; ILK depletion protected the cells while sGC blockade with ODQ
fully recovered the damage.