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2016 ; 6
(ä): 32683
Nephropedia Template TP
Sci Rep
2016[Sep]; 6
(ä): 32683
PMID27604418
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Aberrant placentation generating placental oxidative stress is proposed to play a
critical role in the pathophysiology of preeclampsia. Unfortunately, therapeutic
trials of antioxidants have been uniformly disappointing. There is provisional
evidence implicating mitochondrial dysfunction as a source of oxidative stress in
preeclampsia. Here we provide evidence that mitochondrial reactive oxygen species
mediates endothelial dysfunction and establish that directly targeting
mitochondrial scavenging may provide a protective role. Human umbilical vein
endothelial cells exposed to 3% plasma from women with pregnancies complicated by
preeclampsia resulted in a significant decrease in mitochondrial function with a
subsequent significant increase in mitochondrial superoxide generation compared
to cells exposed to plasma from women with uncomplicated pregnancies. Real-time
PCR analysis showed increased expression of inflammatory markers TNF-?, TLR-9 and
ICAM-1 respectively in endothelial cells treated with preeclampsia plasma.
MitoTempo is a mitochondrial-targeted antioxidant, pre-treatment of cells with
MitoTempo protected against hydrogen peroxide-induced cell death. Furthermore
MitoTempo significantly reduced mitochondrial superoxide production in cells
exposed to preeclampsia plasma by normalising mitochondrial metabolism. MitoTempo
significantly altered the inflammatory profile of plasma treated cells. These
novel data support a functional role for mitochondrial redox signaling in
modulating the pathogenesis of preeclampsia and identifies mitochondrial-targeted
antioxidants as potential therapeutic candidates.