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2016 ; 27
(7
): 1943-57
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Mammalian Target of Rapamycin Mediates Kidney Injury Molecule 1-Dependent Tubule
Injury in a Surrogate Model
#MMPMID26538632
Yin W
; Naini SM
; Chen G
; Hentschel DM
; Humphreys BD
; Bonventre JV
J Am Soc Nephrol
2016[Jul]; 27
(7
): 1943-57
PMID26538632
show ga
Kidney injury molecule 1 (KIM-1), an epithelial phagocytic receptor, is markedly
upregulated in the proximal tubule in various forms of acute and chronic kidney
injury in humans and many other species. Whereas acute expression of KIM-1 has
adaptive anti-inflammatory effects, chronic expression may be maladaptive in
mice. Here, we characterized the zebrafish Kim family, consisting of Kim-1,
Kim-3, and Kim-4. Kim-1 was markedly upregulated in kidney after
gentamicin-induced injury and had conserved phagocytic activity in zebrafish.
Both constitutive and tamoxifen-induced expression of Kim-1 in zebrafish kidney
tubules resulted in loss of the tubule brush border, reduced GFR, pericardial
edema, and increased mortality. Kim-1-induced kidney injury was associated with
reduction of growth of adult fish. Kim-1 expression led to activation of the
mammalian target of rapamycin (mTOR) pathway, and inhibition of this pathway with
rapamycin increased survival. mTOR pathway inhibition in KIM-1-overexpressing
transgenic mice also significantly ameliorated serum creatinine level,
proteinuria, tubular injury, and kidney inflammation. In conclusion, persistent
Kim-1 expression results in chronic kidney damage in zebrafish through a
mechanism involving mTOR. This observation predicted the role of the mTOR pathway
and the therapeutic efficacy of mTOR-targeted agents in KIM-1-mediated kidney
injury and fibrosis in mice, demonstrating the utility of the Kim-1 renal tubule
zebrafish models.
|*Kidney Tubules
[MESH]
|Animals
[MESH]
|Disease Models, Animal
[MESH]
|Hepatitis A Virus Cellular Receptor 1/*physiology
[MESH]