Abstract
Atrial fibrillation (AF) is a condition that heart beats quaveringly or irregularly, which causes blood clots, heart failure, stroke, and other heart-related complications. Therefore, early diagnosis and timely preventions are necessary for AF treatment. Compelling evidence indicated that microRNAs (miRNAs) become emerging biomarkers of AF; thus, we aimed to investigate the possibility of miR-455-5p as an AF marker to provide a new strategy for early diagnosis of AF. A minipump containing angiotensin II was implanted into mice to induce AF, and adeno-associated virus (AAV) carrying anti-miR-negative control (NC) or anti-miR-455-5p was injected into the pericardial space of mice respectively. Next, myocytes isolated from wild-type newborn mice were stimulated with angiotensin II and anti-miR-NC or anti-miR-455-5p mimic. The results showed that the expression of miR-455-5p was positively correlated with the severity of AF, and miR-455-5p mimic accelerated the progression of AF by directly binding to its target gene suppressor of cytokines signaling 3 (SOCS3), leading to the activation of signal transducer and activator of transcription 3 (STAT3) signaling pathway. On the contrary, inhibition of miR-455-5p expression effectively ameliorated AF. In conclusion, miR-455-5p might serve as a biomarker of AF.
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Key Points
1. The expression of miR-455-5p was positively correlated with the severity of AF.
2. Inhibition of miR-455-5p expression effectively ameliorated AF.
3. miR-455-5p might serve as a biomarker of AF.
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Li, W., Qi, N., Wang, S. et al. miR-455-5p regulates atrial fibrillation by targeting suppressor of cytokines signaling 3. J Physiol Biochem 77, 481–490 (2021). https://doi.org/10.1007/s13105-021-00808-x
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DOI: https://doi.org/10.1007/s13105-021-00808-x