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2017 ; 15
(4
): 1497-1506
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Intermedin1?53 enhances angiogenesis and attenuates adverse remodeling following
myocardial infarction by activating AMP?activated protein kinase
#MMPMID28259938
Chen K
; Yan M
; Li Y
; Dong Z
; Huang D
; Li J
; Wei M
Mol Med Rep
2017[Apr]; 15
(4
): 1497-1506
PMID28259938
show ga
Adverse ventricular remodeling is a maladaptive response to acute loss of
myocardium and an important risk factor for heart failure following myocardial
infarction (MI). Intermedin (IMD) is a novel member of the calcitonin/calcitonin
gene?related peptide family, which may possess potent cardioprotective
properties. The aim of the present study was to determine whether IMD1?53, a
mature bioactive form of IMD, may promote therapeutic angiogenesis within the
infarcted myocardium, therefore attenuating adverse ventricular remodeling
post?MI. The present study observed that treatment with IMD1?53 promoted
proliferation, migration and tube formation of primary cultured myocardial
microvascular endothelial cells (MMVECs). In a rat model of MI, chronic
administration of IMD1?53 increased capillary density in the peri?infarct zone,
attenuated ventricular remodeling and improved cardiac performance post?MI.
Treatment with IMD1?53 also significantly increased the expression levels of
phosphorylated?AMP?activated protein kinase (AMPK) and the subsequent activation
of endothelial nitric oxide synthase in MMVECs and post?MI rat myocardium,
without a significant influence on the expression of vascular endothelial growth
factor. Notably, the in vitro effects of IMD1?53 on angiogenesis and the in vivo
effects of IMD1?53 on post?MI ventricular remodeling were largely abrogated by
the co?administration of compound C, an AMPK inhibitor. In conclusion, the
present study demonstrated that IMD1?53 could attenuate adverse ventricular
remodeling post?MI via the promotion of therapeutic angiogenesis, possibly
through the activation of AMPK signaling.