Abstract | PURPOSE: METHODS: STAT3 cardiomyocyte deficient mice (STAT3-KO) and wildtype littermates (STAT3-WT) were submitted to left coronary ligature and reperfused (IR) with or without injection of HDL. Infarct size (IS) was determined and cardiac miRNA expression was evaluated after reperfusion in sham, IR and IR+HDL hearts by microarray analysis. In vitro, neonatal rat ventricular cardiomyocytes were submitted to hypoxia with or without HDL incubation. Cell viability and miRNA expression were analysed. RESULTS: In vivo, HDL reduced IS from 40.5±4.3% to 24.4±2.1% (p<0.05) in STAT3-WT mice. HDL failed to protect in STAT3-KO mice. In STAT3-WT mice, both miR-34b and miR-337 were increased in IR compared to sham and IR+HDL groups (p<0.05). These miRNAs were not modulated in STAT3-KO mice. In vitro, incubation with HDL improved cell viability against hypoxia (p<0.05). The expression of miR-34b and miR-337 was increased by hypoxia and reduced by HDL treatment (p<0.05). In cardiomyocytes transfected with miRNA mimics, HDL failed to improve cell viability against hypoxia. CONCLUSIONS: Our study, performed both in vivo and in vitro, delineates a novel cardioprotective signalling pathway activated by HDL, involving STAT3-mediated decrease of miR-34b and miR-337 expression.
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Authors | Sarah Pedretti, Marie-Claude Brulhart-Meynet, Fabrizio Montecucco, Sandrine Lecour, Richard W James, Miguel A Frias |
Journal | PloS one
(PLoS One)
Vol. 14
Issue 6
Pg. e0218432
( 2019)
ISSN: 1932-6203 [Electronic] United States |
PMID | 31220137
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Lipoproteins, HDL
- MIRN337 microRNA, rat
- MIRN34 microRNA, rat
- MIRN34a microRNA, mouse
- MicroRNAs
- STAT3 Transcription Factor
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Topics |
- Animals
- Apoptosis
(drug effects)
- Cell Survival
(drug effects)
- Humans
- Lipoproteins, HDL
(metabolism, pharmacology)
- Mice
- MicroRNAs
(genetics)
- Myocardial Reperfusion Injury
(drug therapy, genetics, metabolism, pathology)
- Myocytes, Cardiac
(drug effects, pathology)
- Phosphorylation
(drug effects)
- Rats
- STAT3 Transcription Factor
(genetics)
- Signal Transduction
(drug effects)
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