Abstract
Background Cardiac injury is accompanied by dynamic changes in the expression of microRNAs (miRs), small non-coding RNAs that post-transcriptionally regulate target genes. MiR-125b-5p is downregulated in patients with end-stage dilated and ischemic cardiomyopathy, and has been proposed as a biomarker of heart failure. We previously reported that the β-blocker carvedilol promotes cardioprotection via β-arrestin-biased agonism of β1-adrenergic receptor while stimulating miR-125b-5p processing in the mouse heart. We hypothesize that β1-adrenergic receptor/β-arrestin1-responsive miR-125b-5p confers the improvement of cardiac function and structure after acute myocardial infarction. Methods and results Using cultured cardiomyocyte (CM) and in vivo approaches, we show that miR-125b-5p is an ischemic stress-responsive protector against CM apoptosis. CMs lacking miR-125b-5p exhibit increased susceptibility to stress-induced apoptosis, while CMs overexpressing miR-125b-5p have increased phospho-AKT pro-survival signaling. Moreover, we demonstrate that loss-of-function of miR-125b-5p in the mouse heart causes abnormalities in cardiac structure and function after acute myocardial infarction. Mechanistically, the improvement of cardiac function and structure elicited by miR-125b-5p is in part attributed to repression of the pro-apoptotic genes Bak1 and Klf13 in CMs. Conclusions In conclusion, these findings reveal a pivotal role for miR-125b-5p in regulating CM survival during acute myocardial infarction.
| Language | English (US) |
|---|---|
| Pages | 72-82 |
| Number of pages | 11 |
| Journal | Journal of Molecular and Cellular Cardiology |
| Volume | 114 |
| DOIs | |
| State | Published - Jan 1 2018 |
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Keywords
- Apoptotic genes
- Biased G protein-coupled receptor signaling
- Cardioprotection
- MicroRNAs
- β-arrestin
ASJC Scopus subject areas
- Molecular Biology
- Cardiology and Cardiovascular Medicine
Cite this
A carvedilol-responsive microRNA, miR-125b-5p protects the heart from acute myocardial infarction by repressing pro-apoptotic bak1 and klf13 in cardiomyocytes. / Bayoumi, Ahmed S.; Park, Kyoung mi; Wang, Yongchao; Teoh, Jian peng; Aonuma, Tatsuya; Tang, Yao Liang; Su, Huabo; Weintraub, Neal Lee; Kim, Il-man.
In: Journal of Molecular and Cellular Cardiology, Vol. 114, 01.01.2018, p. 72-82.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A carvedilol-responsive microRNA, miR-125b-5p protects the heart from acute myocardial infarction by repressing pro-apoptotic bak1 and klf13 in cardiomyocytes
AU - Bayoumi, Ahmed S.
AU - Park, Kyoung mi
AU - Wang, Yongchao
AU - Teoh, Jian peng
AU - Aonuma, Tatsuya
AU - Tang, Yao Liang
AU - Su, Huabo
AU - Weintraub, Neal Lee
AU - Kim, Il-man
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Background Cardiac injury is accompanied by dynamic changes in the expression of microRNAs (miRs), small non-coding RNAs that post-transcriptionally regulate target genes. MiR-125b-5p is downregulated in patients with end-stage dilated and ischemic cardiomyopathy, and has been proposed as a biomarker of heart failure. We previously reported that the β-blocker carvedilol promotes cardioprotection via β-arrestin-biased agonism of β1-adrenergic receptor while stimulating miR-125b-5p processing in the mouse heart. We hypothesize that β1-adrenergic receptor/β-arrestin1-responsive miR-125b-5p confers the improvement of cardiac function and structure after acute myocardial infarction. Methods and results Using cultured cardiomyocyte (CM) and in vivo approaches, we show that miR-125b-5p is an ischemic stress-responsive protector against CM apoptosis. CMs lacking miR-125b-5p exhibit increased susceptibility to stress-induced apoptosis, while CMs overexpressing miR-125b-5p have increased phospho-AKT pro-survival signaling. Moreover, we demonstrate that loss-of-function of miR-125b-5p in the mouse heart causes abnormalities in cardiac structure and function after acute myocardial infarction. Mechanistically, the improvement of cardiac function and structure elicited by miR-125b-5p is in part attributed to repression of the pro-apoptotic genes Bak1 and Klf13 in CMs. Conclusions In conclusion, these findings reveal a pivotal role for miR-125b-5p in regulating CM survival during acute myocardial infarction.
AB - Background Cardiac injury is accompanied by dynamic changes in the expression of microRNAs (miRs), small non-coding RNAs that post-transcriptionally regulate target genes. MiR-125b-5p is downregulated in patients with end-stage dilated and ischemic cardiomyopathy, and has been proposed as a biomarker of heart failure. We previously reported that the β-blocker carvedilol promotes cardioprotection via β-arrestin-biased agonism of β1-adrenergic receptor while stimulating miR-125b-5p processing in the mouse heart. We hypothesize that β1-adrenergic receptor/β-arrestin1-responsive miR-125b-5p confers the improvement of cardiac function and structure after acute myocardial infarction. Methods and results Using cultured cardiomyocyte (CM) and in vivo approaches, we show that miR-125b-5p is an ischemic stress-responsive protector against CM apoptosis. CMs lacking miR-125b-5p exhibit increased susceptibility to stress-induced apoptosis, while CMs overexpressing miR-125b-5p have increased phospho-AKT pro-survival signaling. Moreover, we demonstrate that loss-of-function of miR-125b-5p in the mouse heart causes abnormalities in cardiac structure and function after acute myocardial infarction. Mechanistically, the improvement of cardiac function and structure elicited by miR-125b-5p is in part attributed to repression of the pro-apoptotic genes Bak1 and Klf13 in CMs. Conclusions In conclusion, these findings reveal a pivotal role for miR-125b-5p in regulating CM survival during acute myocardial infarction.
KW - Apoptotic genes
KW - Biased G protein-coupled receptor signaling
KW - Cardioprotection
KW - MicroRNAs
KW - β-arrestin
UR - http://www.scopus.com/inward/record.url?scp=85033405069&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85033405069&partnerID=8YFLogxK
U2 - 10.1016/j.yjmcc.2017.11.003
DO - 10.1016/j.yjmcc.2017.11.003
M3 - Article
VL - 114
SP - 72
EP - 82
JO - Journal of Molecular and Cellular Cardiology
T2 - Journal of Molecular and Cellular Cardiology
JF - Journal of Molecular and Cellular Cardiology
SN - 0022-2828
ER -