Abstract
Background/aims
The Nod-like receptor protein-3 (NLRP3) inflammasome signalling pathway is involved in the inflammatory reaction of myocardial ischaemia–reperfusion (I/R) injury. Our previous study showed that miR-330-5p was differentially expressed in both cerebral and myocardial I/R injury, and thus might be a biomarker for I/R injury-related diseases. Another study also indicated that miR-330-5p could promote NLRP3 inflammasome activation in renal IRI. However, the role of miR-330-5p in myocardial I/R injury-induced inflammatory responses is unknown. This study aimed to investigate the role of miR-330-5p in NLRP3 inflammasome-mediated myocardial I/R injury.
Methods
Myocardial I/R injury was induced in mice by occlusion of the left anterior descending coronary artery for 45 min followed by reperfusion. For NLRP3 inflammasome stimulation in vitro, cardiomyocytes were treated with 2 h of oxygen and glucose deprivation (OGD) or LPS (100 ng/ml). Myocardial miR-330-5p expression was examined by PCR at different treatment times. A miR-330-5p antagomir and an agomir were used to regulate miR-330-5p expression. To evaluate the role of miR-330-5p in myocardial I/R injury, 2,3,5-triphenyltetrazolium chloride (TTC) staining, echocardiography, and immunoblotting were used to assess infarct volume, cardiac function, and NLRP3 inflammasome activation respectively. A luciferase binding assay was used to examine whether miR-330-5p could directly bind to the T cell immunoglobulin domain and mucin domain-containing molecule-3 (TIM3). Finally, the role of the miR-330-5p/TIM3 axis in regulating apoptosis and NLRP3 inflammasome formation was evaluated with flow cytometry assays and immunofluorescence staining.
Results
Compared to that in the model group, the inhibition of miR-330-5p significantly aggravated myocardial I/R injury, resulting in increased infarct volume and more severe cardiac dysfunction. Moreover, inhibition of miR-330-5p significantly increased the levels of NLRP3 inflammasome-related proteins, including caspase-1, IL-1β, IL-18 and TNF-α, in both in-vivo and in-vitro models. Furthermore, TIM3 was confirmed as a potential target of miR-330-5p. As predicted, suppression of TIM3 by siRNA ameliorated the anti-miR-330-5p-mediated activation of the NLRP3 inflammasome induced by OGD and LPS, thus decreasing cardiomyocyte apoptosis.
Conclusions
Our study indicated that the miR-330-5p/TIM3 axis was involved in the regulatory mechanism of NLRP3 inflammasome-mediated myocardial inflammation.
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Funding
This work was supported by funding from by National Natural Science Foundation of China Grants No. 81974183, CAMS Innovation Fund for Medical Science (CAMS-2016-I2M-1-011), Wu Jieping Medical Foundation (320.6750.2020-04-16).
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Animal experiment: Wei Zuo and Lun Wang; Cell experiment: Hongmei Zhao and Jingyi Li; Echocardiography: Xinglin Yang; Biochemical experiment: Wei Zuo and Lihong Xu; Data analysis: Ran Tian and Qian Chen; Project administration, Zhenyu Liu; Supervision, Bo Zhang; Writing — original draft: Wei Zuo and Zhenyu Liu; Writing — review & editing: Ran Tian and Yingxian Liu.
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Zuo, W., Tian, R., Chen, Q. et al. miR-330-5p inhibits NLRP3 inflammasome-mediated myocardial ischaemia–reperfusion injury by targeting TIM3. Cardiovasc Drugs Ther 35, 691–705 (2021). https://doi.org/10.1007/s10557-020-07104-8
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DOI: https://doi.org/10.1007/s10557-020-07104-8