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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
2014 ; 306
(11
): F1372-80
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Mpv17 in mitochondria protects podocytes against mitochondrial dysfunction and
apoptosis in vivo and in vitro
#MMPMID24598802
Casalena G
; Krick S
; Daehn I
; Yu L
; Ju W
; Shi S
; Tsai SY
; D'Agati V
; Lindenmeyer M
; Cohen CD
; Schlondorff D
; Bottinger EP
Am J Physiol Renal Physiol
2014[Jun]; 306
(11
): F1372-80
PMID24598802
show ga
Mitochondrial dysfunction is increasingly recognized as contributing to
glomerular diseases, including those secondary to mitochondrial DNA (mtDNA)
mutations and deletions. Mitochondria maintain cellular redox and energy
homeostasis and are a major source of intracellular reactive oxygen species (ROS)
production. Mitochondrial ROS accumulation may contribute to stress-induced
mitochondrial dysfunction and apoptosis and thereby to glomerulosclerosis. In
mice, deletion of the gene encoding Mpv17 is associated with glomerulosclerosis,
but the underlying mechanism remains poorly defined. Here we report that Mpv17
localizes to mitochondria of podocytes and its expression is reduced in several
glomerular injury models and in human focal segmental glomerulosclerosis (FSGS)
but not in minimal change disease. Using models of mild or severe nephrotoxic
serum nephritis (NTSN) in Mpv17(+/+) wild-type (WT) and Mpv17(-/-) knockout mice,
we found that Mpv17 deficiency resulted in increased proteinuria (mild NTSN) and
renal insufficiency (severe NTSN) compared with WT. These lesions were associated
with increased mitochondrial ROS generation and mitochondrial injury such as
oxidative DNA damage. In vitro, podocytes with loss of Mpv17 function were
characterized by increased susceptibility to apoptosis and ROS injury including
decreased mitochondrial function, loss of mtDNA content, and change in
mitochondrial configuration. In summary, the inner mitochondrial membrane protein
Mpv17 in podocytes is essential for the maintenance of mitochondrial homeostasis
and protects podocytes against oxidative stress-induced injury both in vitro and
in vivo.