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2015 ; 11
(ä): 1371-81
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Aldehyde dehydrogenase-2 protects against myocardial infarction-related cardiac
fibrosis through modulation of the Wnt/?-catenin signaling pathway
#MMPMID26392772
Zhao X
; Hua Y
; Chen H
; Yang H
; Zhang T
; Huang G
; Fan H
; Tan Z
; Huang X
; Liu B
; Zhou Y
Ther Clin Risk Manag
2015[]; 11
(ä): 1371-81
PMID26392772
show ga
BACKGROUND: Aldehyde dehydrogenase-2 (ALDH2) has a protective effect on ischemic
heart disease. Here, we examined the protective effects of ALDH2 on cardiac
fibrosis through modulation of the Wnt/?-catenin signaling pathway in a rat model
of myocardial infarction (MI). METHODS: Wistar rats were divided into the sham
(control), MI (model), and ALDH2 activator (Alda-1) groups. After 10 days of
treatment, the left ventricular (LV) remodeling parameters of each animal were
evaluated by echocardiography. Myocardial fibrosis was evaluated by Masson's
trichrome staining and Sirius Red staining. Expression levels of collagen types I
and III and ?-smooth muscle actin (?-SMA) were examined. Finally, the expression
and activity of ALDH2 and the levels of several Wnt-related proteins and genes,
such as phosphoglycogen synthase kinase (GSK)-3?, GSK-3?, ?-catenin, Wnt-1,
WNT1-inducible signaling-pathway protein 1, and tumor necrosis factor (TNF)-?,
were also analyzed. RESULTS: After MI, the heart weight/body weight ratio, LV
dimension at end diastole, and LV dimension at end systole were decreased, while
the LV ejection fraction and LV fractional shortening were increased in the
Alda-1 group. Myocardial fibrosis was also reduced in the Alda-1 group,
accompanied by decreased expression collagen types I and III and ?-SMA.
?-Catenin, phosphorylated GSK-3?, and Wnt-1 levels were significantly increased
in the model group. Interestingly, this alteration was partly reversed by Alda-1
treatment. Immunohistochemical staining showed that numerous WNT1-inducible
signaling-pathway protein 1 (WISP-1)- and TNF-?-positive cells were found in the
model group. However, few WISP-1- and TNF-?-positive cells were detected in the
Alda-1 group. CONCLUSION: The reduction of cardiac fibrosis and the
down-regulation of ?-catenin, phosphorylated GSK-3?, Wnt-1, and WISP-1 may be
mediated by increased ALDH2 activity, leading to reduction of MI-related cardiac
fibrosis.