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2016 ; 37
(3
): 679-89
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HMGB1 induces apoptosis and EMT in association with increased autophagy following
H/R injury in cardiomyocytes
#MMPMID26847839
Ouyang F
; Huang H
; Zhang M
; Chen M
; Huang H
; Huang F
; Zhou S
Int J Mol Med
2016[Mar]; 37
(3
): 679-89
PMID26847839
show ga
Hypoxia/reoxygenation (H/R) is a critical factor in the pathogenesis of tissue
injury following myocardial infarction (MI) which can lead to tissue damage and
pathological remodeling. Therefore, it is necessary to try and prevent myocardial
H/R injury in order to optimize the treatment of MI. This study aimed to explore
the functions and molecular mechanisms of action of high mobility group box 1
(HMGB1) and its role in H/R injury to H9c2 cells. The mRNA expression of levels
genes were detected by RT-qPCR. The protein levels were examined by western blot
analysis. The Beclin 1 expression level was further determined by
immunocytochemistry (ICC). In addition, an HMGB1 overexpression vector and a
shRNA lentiviral vector were constructed in order to induce the overexpression
and silencing of HMGB1, respectively. The apoptotic rate of the H9c2 cells was
determined by flow cytometry. The expression of miR-210 was markedly increased
following the exposure of the cells to H/R, thus indicating that the cell model
of H/R injury was successfully established. In addition, an in vivo model of MI
was also created using rats. The mRNA and protein level of HMGB1 was found to be
upregulated in the myocardial tissue of the rats with MI and in the H9c2 cells
subjected to H/R injury. HMGB1 promoted apoptosis by increasing the expression of
cleaved caspase-3 and the apoptotic rate of the cells, while decreasing the
expression of Bcl-2 during H/R in the H9c2 cells. HMGB1 promoted
epithelial-to-mesenchymal transition (EMT) by reducing the protein level of the
epithelial marker, E-cadherin, while increasing the expression of the mesenchymal
markers, vimentin and fibroblast-specific protein (FSP), during H/R in the H9c2
cells. HMGB1 induced the apoptosis of the H9c2 cells and EMT following H/R in
association with the induction of autophagy. HMGB1 induced autophagy by
upregulating the expression of discoidin domain receptor 1 (DDR1) and
downregulating the phosphorylation levels of mammalian target of rapamycin
(mTOR). In conclusion, the findings of our study suggest that HMGB1 promotes
apoptosis and EMT in association with the induction of autophagy through the
upregulation of the expression of DDR1 and the downregulation of the
phosphorylation of mTOR following H/R injury in H9c2 cells.