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2018 ; 8
(1
): 5584
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Dual mTOR/PI3K inhibition limits PI3K-dependent pathways activated upon mTOR
inhibition in autosomal dominant polycystic kidney disease
#MMPMID29615724
Liu Y
; Pejchinovski M
; Wang X
; Fu X
; Castelletti D
; Watnick TJ
; Arcaro A
; Siwy J
; Mullen W
; Mischak H
; Serra AL
Sci Rep
2018[Apr]; 8
(1
): 5584
PMID29615724
show ga
Autosomal dominant polycystic kidney disease (ADPKD) is characterized by the
development of kidney cysts leading to kidney failure in adulthood. Inhibition of
mammalian target of rapamycin (mTOR) slows polycystic kidney disease (PKD)
progression in animal models, but randomized controlled trials failed to prove
efficacy of mTOR inhibitor treatment. Here, we demonstrate that treatment with
mTOR inhibitors result in the removal of negative feedback loops and up-regulates
pro-proliferative phosphatidylinositol 3-kinase (PI3K)-Akt and PI3K-extracellular
signal-regulated kinase (ERK) signaling in rat and mouse PKD models. Dual
mTOR/PI3K inhibition with NVP-BEZ235 abrogated these pro-proliferative signals
and normalized kidney morphology and function by blocking proliferation and
fibrosis. Our findings suggest that multi-target PI3K/mTOR inhibition may
represent a potential treatment for ADPKD.