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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Hum+Mol+Genet
2014 ; 23
(18
): 4919-31
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An mTOR anti-sense oligonucleotide decreases polycystic kidney disease in mice
with a targeted mutation in Pkd2
#MMPMID24847003
Ravichandran K
; Zafar I
; He Z
; Doctor RB
; Moldovan R
; Mullick AE
; Edelstein CL
Hum Mol Genet
2014[Sep]; 23
(18
): 4919-31
PMID24847003
show ga
Autosomal dominant polycystic kidney disease (ADPKD) is the most common
life-threatening hereditary disease in the USA. In human ADPKD studies,
sirolimus, a mammalian target of rapamycin complex 1 (mTORC1) inhibitor, had
little therapeutic effect. While sirolimus robustly inhibits mTORC1, it has a
minimal effect on mTOR complex 2 (mTORC2). Polycystic kidneys of Pkd2WS25/- mice,
an orthologous model of human ADPKD caused by a mutation in the Pkd2 gene, had an
early increase in pS6 (marker of mTORC1) and pAktSer(473) (marker of mTORC2). To
investigate the effect of combined mTORC1 and 2 inhibition, Pkd2WS25/- mice were
treated with an mTOR anti-sense oligonucleotide (ASO) that blocks mTOR expression
thus inhibiting both mTORC1 and 2. The mTOR ASO resulted in a significant
decrease in mTOR protein, pS6 and pAktSer(473). Pkd2WS25/- mice treated with the
ASO had a normalization of kidney weights and kidney function and a marked
decrease in cyst volume. The mTOR ASO resulted in a significant decrease in
proliferation and apoptosis of tubular epithelial cells. To demonstrate the role
of mTORC2 on cyst growth, Rictor, the functional component of mTORC2, was
silenced in Madin-Darby canine kidney cell cysts grown in 3D cultures. Silencing
Rictor significantly decreased cyst volume and expression of pAktSer(473). The
decreased cyst size in the Rictor silenced cells was reversed by introduction of
a constitutively active Akt1. In vitro, combined mTORC1 and 2 inhibition reduced
cyst growth more than inhibition of mTORC1 or 2 alone. In conclusion, combined
mTORC1 and 2 inhibition has therapeutic potential in ADPKD.