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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 Am+J+Physiol+Renal+Physiol
2016 ; 311
(3
): F626-39
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Reducing mTOR augments parietal epithelial cell density in a model of acute
podocyte depletion and in aged kidneys
#MMPMID27440779
McNicholas BA
; Eng DG
; Lichtnekert J
; Rabinowitz PS
; Pippin JW
; Shankland SJ
Am J Physiol Renal Physiol
2016[Sep]; 311
(3
): F626-39
PMID27440779
show ga
Parietal epithelial cell (PEC) response to glomerular injury may underlie a
common pathway driving fibrogenesis following podocyte loss that typifies several
glomerular disorders. Although the mammalian target of rapamycin (mTOR) pathway
is important in cell homeostasis, little is known of the biological role or
impact of reducing mTOR activity on PEC response following podocyte depletion,
nor in the aging kidney. The purpose of these studies was to determine the impact
on PECs of reducing mTOR activity following abrupt experimental depletion in
podocyte number, as well as in a model of chronic podocyte loss and sclerosis
associated with aging. Podocyte depletion was induced by an anti-podocyte
antibody and rapamycin started at day 5 until death at day 14 Reducing mTOR did
not lead to a greater reduction in podocyte density, despite greater
glomerulosclerosis. However, mTOR inhibition lead to an increase in PEC density
and PEC-derived crescent formation. Additionally, markers of
epithelial-to-mesenchymal transition (platelet-derived growth factor receptor-?,
?-smooth muscle actin, Notch-3) and PEC activation (CD44, collagen IV) were
further increased by mTOR reduction. Aged mice treated with rapamycin for 1, 2,
and 10 wk before death at 26.5 mo (?75-yr-old human age) had increased the number
of glomeruli with a crescentic appearance. mTOR inhibition at either a high or
low level lead to changes in PEC phenotype, indicating PEC morphology is
sensitive to changes mediated by global mTOR inhibition.