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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 PLoS+One
2017 ; 12
(11
): e0187459
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Apoptosis signal-regulating kinase 1 inhibition attenuates cardiac hypertrophy
and cardiorenal fibrosis induced by uremic toxins: Implications for cardiorenal
syndrome
#MMPMID29107962
Savira F
; Cao L
; Wang I
; Yang W
; Huang K
; Hua Y
; Jucker BM
; Willette RN
; Huang L
; Krum H
; Li Z
; Fu Q
; Wang BH
PLoS One
2017[]; 12
(11
): e0187459
PMID29107962
show ga
Intracellular accumulation of protein-bound uremic toxins in the setting of
cardiorenal syndrome leads to adverse effects on cardiorenal cellular functions,
where cardiac hypertrophy and cardiorenal fibrosis are the hallmarks. In this
study, we sought to determine if Apoptosis Signal-Regulated Kinase 1 (ASK1), an
upstream regulator of cellular stress response, mediates cardiac hypertrophy and
cardiorenal fibrosis induced by indoxyl sulfate (IS) and p-cresol sulfate (PCS)
in vitro, and whether ASK1 inhibition is beneficial to ameliorate these cellular
effects. PCS augmented cardiac myocyte hypertrophy and fibroblast collagen
synthesis (as determined by 3H-leucine and 3H-proline incorporation,
respectively), similar to our previous finding with IS. IS and PCS also increased
collagen synthesis of proximal tubular cells and renal mesangial cells.
Pro-hypertrophic (?-skeletal muscle actin and ?-MHC) and pro-fibrotic genes
(TGF-?1 and ctgf) were induced by both IS and PCS. Western blot analyses revealed
the activation of ASK1 and downstream mitogen activated protein kinases (MAPKs)
(p38MAPK and ERK1/2) as well as nuclear factor-kappa B (NF-?B) by IS and PCS.
ASK1, OAT1/3, ERK1/2 and p38MAPK inhibitors suppressed all these effects. In
summary, IS and PCS exhibit pro-hypertrophic and pro-fibrotic properties, at
least in part, via the activation of ASK1 and its downstream pathways. ASK1
inhibitor is an effective therapeutic agent to alleviate protein-bound uremic
toxin-induced cardiac hypertrophy and cardiorenal fibrosis in vitro, and may be
translated further for cardiorenal syndrome therapy.