收稿日期: 2023-05-14
网络出版日期: 2023-12-19
基金资助
湖南省卫生健康委员会科研项目(20210278)
Molecular mechanism of Mettl14 mediated m6A modification in improving myocardial infarction
Received date: 2023-05-14
Online published: 2023-12-19
目的 探索甲基转移酶样14(METTL14)介导的N6-甲基腺苷(m6A)修饰在心肌梗死(MI)中的生物学作用。 方法 将小鼠随机分为4组,每组10只:Sham+AAV9-NC组、Sham+AAV9-METTL14组、MI+AAV9-NC组和MI+AAV9-METTL14组。各组小鼠分别在MI诱导前1周将AAV9-METTL14或AAV9-NC通过尾静脉注射到小鼠体内。通过经胸超声心动图无创测量心脏功能,并采用免疫荧光测定小鼠微血管损伤和内皮线粒体功能障碍。从小鼠心肌组织中分离CMECs,对细胞进行去氧葡萄糖(OGD)处理。 结果 METTL14在MI小鼠心脏组织以及OGD处理的CMECs中下调。与Sham+AAV9-NC组小鼠相比,MI +AAV9-NC组小鼠中VE-cadherin表达显著下调(P < 0.05),线粒体ROS水平显著增加(P < 0.05)。MI+AAV9-METTL14抑制了这些变化,并增强了小鼠的心脏功能。与NC组相比,在OGD组CMECs细胞中观察到线粒体ROS水平显著增加(P < 0.05)。CMECs细胞中METTL14敲低加剧了ROS水平(P < 0.05),当加入USP48过表达质粒则逆转了这些变化(P < 0.05)。 结论 METTL14在MI中低表达,并通过增加CMECs细胞USP48的m6A修饰水平以降低其稳定性,从而介导CMECs细胞线粒体功能障碍。
郑学斌 , 沙莎 , 杨慧琼 , 刘恋 . Mettl14介导的m6A修饰对改善心肌梗死的分子机制[J]. 实用医学杂志, 2023 , 39(21) : 2754 -2760 . DOI: 10.3969/j.issn.1006-5725.2023.21.011
Objective To investigate the biological role of methyltransferase-like 14 (METTL14)-mediated m6A modification in myocardial infarction (MI). Methods A total of 40 mice were randomly divided into 4 groups: Sham+AAV9-NC group (n = 10), Sham+AAV9-METTL14 group (n = 10), MI+AAV9-NC group (n = 10) and MI+AAV9-METTL14 group (n = 10). Mice in each group were injected with AAV9-METTL14 or AAV9-NC through the tail vein one week before MI induction. Cardiac function was measured non-invasively by transthoracic echocardiography, and microvascular injury were measured by immunofluorescence. CMECs were isolated from mouse myocardial tissue, and the cells were treated with oxygen-glucose deprivation (OGD). Results METTL14 was downregulated in MI mouse heart tissue as well as in OGD-treated CMECs. Compared with the Sham+AAV9-NC group, the expression of VE-cadherin was significantly down-regulated (P < 0.05), ROS levels increased significantly (P < 0.05) in the MI+AAV9-NC group. MI+AAV9-METTL14 suppressed these changes and enhanced cardiac function in mice. Compared with the NC group, a significant increase in mitochondrial ROS levels was observed in the OGD group (P < 0.05). Knockdown of METTL14 in CMECs exacerbated ROS levels (P < 0.05), and the addition of USP48 overexpression plasmid reversed these changes (P < 0.05). Conclusion METTL14 was lowly expressed in MI and mediates mitochondrial dysfunction in CMECs by increasing the m6A modification level of USP48 in CMECs to reduce its stability.
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