MicroRNA-214 Inhibits Left Ventricular Remodeling in an Acute Myocardial Infarction Rat Model by Suppressing Cellular Apoptosis via the Phosphatase and Tensin Homolog (PTEN)
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- Yang Xingwei
- Department of Emergency, The First Hospital of Qinhuangdao
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- Qin Yanjun
- Department of Emergency, The Third Hospital of Hebei Medical University
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- Shao Suxia
- Department of Histology and Embryology, Hebei Medical University
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- Yu Yueqing
- Clinical Laboratory, The General Hospital of Hebei Province
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- Zhang Chongyang
- Department of Emergency, The First Hospital of Qinhuangdao
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- Dong Hua
- Department of Emergency, The First Hospital of Qinhuangdao
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- Lv Guangwei
- Department of Emergency, Cangzhou Central Hospital
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- Dong Shimin
- Department of Emergency, The Third Hospital of Hebei Medical University
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抄録
The aims of the present study were to determine the role of miR-214 on left ventricular remodeling of rat heart with acute myocardial infarction (AMI) and to further investigate the underlying mechanism of miR-214-mediated myocardial protection. AMI was induced in which adenovirus-expressing miR-214 (Ad-miR-214), anti-miR-214, or Ad-GFP had been delivered into rats hearts 4 days prior, while a phosphatase and tensin homolog (PTEN) inhibitor was administered via intra-peritoneal injection 30 minutes prior to AMI. Changes in hemodynamic parameters were detected and recorded. Left ventricular (LV) dimensions and LV/BW were measured. Quantitative RT-PCR was used to determine the miR-214 expression levels of the myocytes in the infarcted, border, and non-infarcted areas of the LV. Myocardial infarct size was also measured. Flow cytometry analysis was performed to examine cellular apoptosis. Western blot analysis was performed to examine PTEN expression. The results showed that miR-214 was upregulated in both border and infarcted areas. Myocardial cell apoptosis was decreased in the Ad-miR-214 group, but was increased in the anti-miR-214 group, while there were no differences among the Ad-GFP-group, PTEN-ad-miR-214 group, or PTEN-anti-miR-214 group. Myocardial infarct size, LV dimensions, heart rate (HR), and LV end-diastolic pressure (LVEDP) were decreased while the maximal rates of rise or decline in blood pressure in the ventricular chamber (± dp/dt) and LV systolic pressure (LVSP) were increased in the Ad-miR-214 group, all of which exhibited opposite changes in the anti-miR-214 group. PTEN was downregulated in the Ad-miR-214 group and upregulated in the anti-miR-214 group. PTEN was decreased in both the border and infarcted areas compared with non-infarcted areas. The study results suggest that Ad-miR-214 improves LV remodeling and decreases the apoptosis of myocardial cells through PTEN, suggesting a possible mechanism by which Ad-miR-214 functions in protecting against AMI injury.
収録刊行物
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- International Heart Journal
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International Heart Journal 57 (2), 247-250, 2016
一般社団法人 インターナショナル・ハート・ジャーナル刊行会