Extracellular vesicles enriched with miR-150 released by macrophages regulates the TP53-IGF-1 axis to alleviate myocardial infarction
| Autor: | Maolei Gong, Jing Chen, Suxia Zheng |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Male Physiology Myocardial Infarction Apoptosis Cell Line 03 medical and health sciences chemistry.chemical_compound Extracellular Vesicles Mice 0302 clinical medicine Downregulation and upregulation Western blot Physiology (medical) Lactate dehydrogenase medicine PTEN Tensin Animals Insulin-Like Growth Factor I TUNEL assay biology medicine.diagnostic_test Chemistry Macrophages Myocardium Isolated Heart Preparation Cell biology Rats Mice Inbred C57BL Disease Models Animal MicroRNAs 030104 developmental biology Real-time polymerase chain reaction RAW 264.7 Cells Gene Expression Regulation 030220 oncology & carcinogenesis biology.protein Tumor Suppressor Protein p53 Cardiology and Cardiovascular Medicine Signal Transduction |
| Zdroj: | American journal of physiology. Heart and circulatory physiology. 320(3) |
| ISSN: | 1522-1539 |
| Popis: | Myocardial infarction (MI) is recognized as a major cause of death and disability around the world. Macrophage-derived extracellular vesicles (EVs) have been reportedly involved in the regulation of cellular responses to MI. Thus, we sought to clarify the mechanism by which macrophage-derived EVs regulate this process. Reverse transcription quantitative polymerase chain reaction (RT-qPCR) was performed to determine microRNA-150 (miR-150) expression in an MI mouse model with ligation of the left anterior descending coronary artery (LAD) and in hypoxia/reoxygenation (H/R)-exposed cardiomyocytes. Bioinformatics analysis and dual luciferase reporter gene assay were adopted to identify the correlation of miR-150 with tumor protein 53 (TP53) expression in cardiomyocytes. Gain- and loss-of-function experiments were conducted in H/R-induced cardiomyocytes, cardiomyocytes incubated with EVs from miR-150 mimic-transfected macrophages, or MI-model mice treated with EVs from miR-150 mimic-transfected macrophages. hematoxylin-eosin (HE) and terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling (TUNEL) staining assays were used for detecting inflammatory infiltration and cell apoptosis. The release of lactate dehydrogenase (LDH) by dead cardiomyocytes was measured with an LDH kit, and the apoptosis-related proteins, Bax, and cleaved-caspase 3 were determined by Western blot analysis. miR-150 expression was downregulated in the infarcted cardiac tissues of MI mice. Macrophage-derived EVs could transfer miR-150 into cardiomyocytes, where it directly targeted and suppressed TP53. Furthermore, miR-150 suppressed phosphatase and tensin homology (PTEN) and activated p-Akt to upregulate IGF-1 expression. Furthermore, increased expression of EV-derived miR-150 prevented cardiomyocyte apoptosis in vitro, as evidenced by downregulated Bax and cleaved-caspase 3 and upregulated Bcl2 and alleviated MI in vivo. In conclusion, our study demonstrates the cardioprotective effect of macrophage-derived EV-miR-150 on MI-induced heart injury through negatively regulating the TP53-IGF-1 signaling pathway.NEW & NOTEWORTHY miR-150 is expressed at a low level in cardiac tissues after myocardial infarction. Macrophages-derived EVs transfer miR-150 to cardiomyocytes. miR-150 directly targets TP53. miR-150 elevation regulates TP53-IGF-1 axis to reduce cardiomyocyte apoptosis. EV-derived miR-150 could be a potential therapeutic target for myocardial infarction. |
| Databáze: | OpenAIRE |
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