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1.福建医科大学附属第一医院麻醉科,福建 福州 350000
2.福建医科大学麻醉学研究所,福建 福州 350000
林博,E-mail:linbo2472@163.com
收稿日期:2024-09-05,
纸质出版日期:2025-06-25
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林博,叶馨怡,李羽茜.沉默METTL3促进脓毒症小鼠脑微血管内皮细胞线粒体自噬的机制研究[J].局解手术学杂志,2025,34(06):465-470.
LIN Bo,YE Xin-yi,LI Yu-qian.Mechanism of silencing METTL3-mediated mitophagy in cerebral microvascular endothelial cells of mice with sepsis[J].JOURNAL OF REGIONAL ANATOMY AND OPERATIVE SURGERY,2025,34(06):465-470.
林博,叶馨怡,李羽茜.沉默METTL3促进脓毒症小鼠脑微血管内皮细胞线粒体自噬的机制研究[J].局解手术学杂志,2025,34(06):465-470. DOI: 10.11659/jjssx.09E024027.
LIN Bo,YE Xin-yi,LI Yu-qian.Mechanism of silencing METTL3-mediated mitophagy in cerebral microvascular endothelial cells of mice with sepsis[J].JOURNAL OF REGIONAL ANATOMY AND OPERATIVE SURGERY,2025,34(06):465-470. DOI: 10.11659/jjssx.09E024027.
目的
2
探讨甲基转移酶样3(METTL3)对脓毒症小鼠脑微血管内皮细胞中Sigma-1受体(Sigma-1R)mRNA的m6A甲基化和线粒体自噬的调控作用。
方法
2
将12只成年雄性C57BL/6J小鼠随机分为假手术组(不进行盲肠结扎穿孔)和脓毒症组(进行盲肠结扎穿孔术),每组6只。分别使用m6A Dot blot、RT-qPCR和Western blot检测脑微血管组织中的m6A甲基化水平、METTL3和Sigma-1R mRNA及蛋白相对表达量。体外培养bEnd.3细胞株,分为对照组(正常培养)、模型组[脂多糖(LPS)诱导体外脓毒症]、si-NC组(LPS处理联合转染si-NC)、si-METTL3组(LPS处理联合转染si-METTL3)。使用m6A Dot blot检测各组细胞中m6A甲基化水平;RT-qPCR检测METTL3和Sigma-1R mRNA的表达;Western blot检测METTL3、Sigma-1R以及自噬相关蛋白Bnip3、LC3B和Beclin1的表达。用m6A 免疫共沉淀-qPCR检测各组细胞中Sigma-1R的m6A甲基化水平。用JC-1探针法检测各组细胞线粒体膜电位,ATP检测试剂盒检测线粒体ATP含量。
结果
2
与假手术组比较,脓毒症组小鼠脑微血管组织中m6A甲基化水平和METTL3的表达增加(
P
<
0.05),而Sigma-1R的表达降低(
P
<
0.05)。与对照组比较,模型组和si-NC组细胞中m6A甲基化水平、METTL3表达和Sigma-1R mRNA的m6A甲基化水平增加,Sigma-1R表达、线粒体膜电位正常率和增加率降低,ATP含量减少,Bnip3、LC3B、Beclin1蛋白表达均下调,差异均有统计学意义(
P
<
0.05)。与si-NC组比较,si-METTL3组细胞中m6A甲基化水平、METTL3表达和Sigma-1R mRNA的m6A甲基化水平降低,Sigma-1R表达、线粒体膜电位正常率和增加率升高,ATP含量增加,Bnip3、LC3B、Beclin1蛋白表达均上调,差异均有统计学意义(
P
<
0.05)。
结论
2
沉默METTL3抑制Sigma-1R mRNA的m6A甲基化并促进脓毒症小鼠脑微血管内皮细胞的线粒体自噬。
Objective
2
To explore the regulatory effect of methyltransferase-like 3 (METTL3) on m6A methylation of Sigma-1 receptor (Sigma-1R) mRNA and mitophagy in cerebral microvascular endothelial cells of sepsis mice.
Methods
2
Twelve adult male C57BL/6J mice were randomly divided into the Sham group (without cecal ligation or puncture) and the sepsis group (received cecal ligation and puncture),with 6 mice in each group. m6A methylation levels,and relative expression of METTL3 and Sigma-1R mRNA and protein in cerebral microvascular tissues were detected by m6A Dot blot,RT-qPCR,and Western blot,respectively.The bEnd.3 cells were cultured in vitro and divided into the control group (normal culture),model group [lipopolysaccharide (LPS)-induced in vitro sepsis],si-NC group (LPS treatment combined with si-NC transfection ),and si-METTL3 group (LPS treatment combined with si-METTL3 transfection). m6A Dot blot was used to detect m6A methylation levels of cells in each group;RT-qPCR was used to detect the mRNA expression of METTL3 and Sigma-1R;and Western blot was used to detect the expression of METTL3,Sigma-1R,and autophagy-related proteins of Bnip3,LC3B,and Beclin1. m6A chromatin immunoprecipitation-qPCR was used to detect m6A methylation level of Sigma-1R of cells in each group. JC-1 probe was used to detect the mitochondrial membrane potential,and the ATP assay kit was used to detect the mitochondrial ATP content.
Results
2
Compared with the Sham group,the sepsis group showed increased m6A methylation level and METTL3 expression (
P
<
0.05),and decreased Sigma-1R expression in cerebral microvascular tissues(
P
<
0.05). Compared with the control group,m6A methylation level,METTL3 expression and m6A methylation level of Sigma-1R mRNA increased,the expression of Sigma-1R,the normal rate and increase rate of mitochondrial membrane potential,and the ATP content decreased,and the protein expression of Bnip3,LC3B and Beclin1 downregulated in the model group and the si-NC group,with statistically significant differences (
P
<
0.05). Compared w
ith the si-NC group,m6A methylation level,METTL3 expression and m6A methylation level of Sigma-1R mRNA decreased,the expression of Sigma-1R,the normal rate and increase rate of mitochondrial membrane potential elevated,the ATP content increased,and the protein expression of Bnip3,LC3B and Beclin1 upregulated in the si-METTL3 group,with statistically significant differences (
P
<
0.05).
Conclusion
2
Silencing METTL3 can inhibit m6A methylation of Sigma-1R mRNA and promote the mitophagy in cerebral microvascular endothelial cells of septic mice.
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