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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
2015 ; 309
(6
): F540-50
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Simultaneous deletion of Bax and Bak is required to prevent apoptosis and
interstitial fibrosis in obstructive nephropathy
#MMPMID26180237
Jang HS
; Padanilam BJ
Am J Physiol Renal Physiol
2015[Sep]; 309
(6
): F540-50
PMID26180237
show ga
Proximal tubular injury and apoptosis are key mediators of the development of
kidney fibrosis, a hallmark of chronic kidney disease. However, the molecular
mechanism by which tubular apoptotic cell death leads to kidney fibrosis is
poorly understood. In the present study, we tested the roles of Bcl-2-associated
X (Bax) and Bcl-2 antagonist/killer (Bak), two crucial proteins involved in
intrinsic apoptotic cell death, in the progression of kidney fibrosis. Mice with
proximal tubule-specific Bax deletion, systemic deletion of Bak, and dual
deletion of Bax and Bak were subjected to unilateral ureteral obstruction (UUO).
Dual deficiency of Bax and Bak inhibited tubular apoptosis and atrophy.
Consistent with decreased tubular injury, dual ablation of Bax and Bak suppressed
UUO-induced inflammation and kidney fibrosis with decreased tubular cell cycle
arrest, expression of fibrogenic and inflammatory cytokines, and oxidative stress
in the kidney. Bax or Bak deficiency was insufficient to prevent apoptosis and
all other aforementioned malevolent effects, suggesting compensatory mediation by
each other in the respective signaling pathways. These data suggest that dual
ablation of Bax and Bak in the kidney is required to prevent UUO-induced tubular
apoptosis and the consequent kidney inflammation and fibrosis.