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2017 ; 8
(ä): 819
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Aliskiren Improves Ischemia- and Oxygen Glucose Deprivation-Induced Cardiac
Injury through Activation of Autophagy and AMP-Activated Protein Kinase
#MMPMID29184499
Chiang MH
; Liang CJ
; Liu CW
; Pan BJ
; Chen WP
; Yang YF
; Lee IT
; Tsai JS
; Lee CW
; Chen YL
Front Pharmacol
2017[]; 8
(ä): 819
PMID29184499
show ga
Aliskiren is a direct renin inhibitor that has been effective in
anti-hypertension. We investigated whether aliskiren could improve the
ischemia-induced cardiac injury and whether the autophagy was involved in this
effect. A myocardial infarction (MI) model was created by the ligation of the
left anterior coronary artery in C57J/BL6 mice. They were treated for 1, 3, 7,
and 14 days with vehicle or aliskiren (25 mg/kg/day via subcutaneous injection).
In vivo, the MI mice exhibited worse cardiac function by echocardiographic
assessment and showed larger myocardial scarring by light microscopy, whereas
aliskiren treatment reversed these effects, which were also associated with the
changes in caspase-3 and Bcl-2 expression as well as in the number of apoptotic
cells. Aliskiren increased autophagy, as demonstrated by LC3B-II expression and
transmission electron microscopy. Furthermore, H9c2 cardiomyocytes were employed
as an in vitro model to examine the effects of aliskiren on apoptosis and
autophagy under oxygen glucose deprivation (OGD)-induced injury. Aliskiren
significantly increased cell viability in a dose-dependent manner. The beneficial
effects of aliskiren were associated with decreased apoptosis and mitochondrial
membrane potential as well as increased autophagy via increased autophagosome
formation. We also found that aliskiren-induced cardiomyocyte survival occurred
via AMP-activated protein kinase (AMPK)-dependent autophagy. Taken together,
these results indicated that aliskiren increased cardiomyocyte survival through
increased autophagosomal formation and decreased apoptosis and necrosis via
modulating AMPK expression. AMPK-dependent autophagy may represent a novel
mechanism for aliskiren in ischemic cardiac disease therapy.