Abstract
To investigate whether miR-124-3p influences cell apoptosis, inflammatory response, and oxidative stress in rats with acute myocardial infarction (AMI) by mediating the SIRT1/FGF21/CREB/PGC1α pathway. A dual-luciferase reporter gene assay was performed to verify the relationship between miR-124-3p and SIRT1. AMI rats were established via coronary artery ligation after injection with agomiR-124-3p, antagomiR-124-3p, and/or SIRT1 siRNA, and triphenyltetrazolium chloride (TTC), HE, and TUNEL stainings were performed. Bio-Plex rat cytokine assays were performed to determine proinflammatory factor levels. qRT-PCR and Western blotting were used to examine the mRNA and protein expression, respectively. The activity levels of antioxidant enzymes in myocardial tissues were also measured. miR-124-3p was confirmed to target SIRT1 in the H9C2 cells. AMI rats exhibited increased miR-124-3p expression and decreased SIRT1 expression in myocardial tissues. HE staining showed a disorganized cell arrangement and inflammatory cell infiltration in the myocardial tissues of the AMI rats, which was more severe in the rats injected with SIRT1 and agomiR-124-3p but was ameliorated in those treated with antagomiR-124-3p. Moreover, the AMI rats in the antagomiR-124-3p group presented with a reduction in infarct area with an increase in antioxidant enzyme activity, Bcl-2 expression, and activation of the FGF21/CREB/PGC1α pathway, as well as a decrease in cell apoptosis rate, Bax and Caspase-3 expression, and levels of proinflammatory factors, effects that were reversed by si-SIRT1. Inhibiting miR-124-3p expression may activate the FGF21/CREB/PGC1α pathway to reduce cell apoptosis, alleviate the inflammatory response, and attenuate oxidative stress in AMI rats by targeting SIRT1.
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We appreciate all the reviewers for their helpful suggestions in this work.
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Yun-Jie Wei and Jun-Feng Wang conceived the idea and designed the study. Fei Cheng analyzed the data. Hai-Jun Xu designed illustrations and figures. Jia-Juan Chen conducted the experiments. Jian Xiong and Jing Wang wrote the manuscript, with all authors contributing to writing and providing feedback. The authors declare that all data were generated in-house and that no paper mill was used.
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The experimental animals were housed under the regulations of animal protection and use as described by the International Association for the Study of Pain (IASP), and this study received the approval of the Animal Ethics Committee of our hospital.
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Key Points
1. AMI rats exhibited increased miR-124-3p and decreased SIRT1 levels in myocardial tissues.
2. miR-124-3p downregulation activated the SIRT1/FGF21/CREB/PGC1α pathway.
3. Inhibiting miR-124-3p reduced the myocardial cell apoptosis rate and attenuated oxidative stress and the inflammatory response in AMI rats.
4. Inhibiting SIRT1 exacerbated the severity of AMI in rats.
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Wei, YJ., Wang, JF., Cheng, F. et al. miR-124-3p targeted SIRT1 to regulate cell apoptosis, inflammatory response, and oxidative stress in acute myocardial infarction in rats via modulation of the FGF21/CREB/PGC1α pathway. J Physiol Biochem 77, 577–587 (2021). https://doi.org/10.1007/s13105-021-00822-z
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DOI: https://doi.org/10.1007/s13105-021-00822-z