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遵义医科大学附属医院心脏大血管外科,遵义 563000
黄德荣,Email:hdr110828@163.com, 研究方向:病理性心肌肥厚和纤维化。
收稿:2024-10-24,
修回:2024-11-27,
录用:2024-12-12,
纸质出版:2025-05-28
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黄德荣,文庆,苏宇辰.转录因子E4BP4通过AMPK-TGF-β1/SMAD3信号转导途径调控病理性心肌纤维化[J].重庆医科大学学报,2025,50(5):640-648.
Huang Derong,Wen Qing,Su Yuchen.Regulatory effect of transcription factor E4BP4 on pathological myocardial fibrosis through the AMPK-TGF-β1/SMAD3 signaling pathway[J].Journal of Chongqing Medical University,2025,50(5):640-648.
黄德荣,文庆,苏宇辰.转录因子E4BP4通过AMPK-TGF-β1/SMAD3信号转导途径调控病理性心肌纤维化[J].重庆医科大学学报,2025,50(5):640-648. DOI: 10.13406/j.cnki.cyxb.003762.
Huang Derong,Wen Qing,Su Yuchen.Regulatory effect of transcription factor E4BP4 on pathological myocardial fibrosis through the AMPK-TGF-β1/SMAD3 signaling pathway[J].Journal of Chongqing Medical University,2025,50(5):640-648. DOI: 10.13406/j.cnki.cyxb.003762.
目的
2
探讨转录因子腺病毒E4启动子结合蛋白(adenovirus E4 promoter-binding protein,E4BP4)通过腺苷酸活化蛋白激酶(adenosine monophosphate-activated protein kinase,AMPK)-转化生长因子(transforming growth factor,TGF)-β1/SMAD同源物3(Smad homolog 3,SMAD3)通路在调控病理性心肌纤维化的作用。
方法
2
建立小鼠心脏纤维化模型,分别于模型组和假手术组中检测E4BP4的表达差异。分离和培养原代心脏成纤维细胞,血管紧张素Ⅱ(angiotensin Ⅱ,Ang Ⅱ)刺激增殖活化,分别转染E4BP4过表达质粒(Ang Ⅱ+E4BP4组)、E4BP4干扰质粒(Ang Ⅱ+siE4BP4组)、Ang Ⅱ组和未经Ang Ⅱ处理的对照组。免疫荧光检测α-肌动蛋白(α-smooth muscle actin,α-SMA)荧光强度,细胞增殖检测试剂盒测定细胞活力,聚合酶链式反应检测E4BP4、α-SMA、Ⅰ型胶原蛋白(collagen type Ⅰ,Collagen Ⅰ)和Ⅲ型胶原蛋白(collagen type Ⅲ,Collagen Ⅲ)的表达,蛋白质印迹检测TGF-β1、AMPK和SMAD3的蛋白表达。
结果
2
与假手术组比较,模型组心肌纤维化程度(38.46±1.21 vs. 3.39±0.39,
t
=-78.564,
P
=0.000)、E4BP4蛋白表达量(0.96±0.03 vs. 0.75±0.03,
t
=-11.480,
P
=0.000)均明显增加。体外实验发现,与Ang Ⅱ+E4BP4组比较,Ang Ⅱ+siE4BP4组在平均荧光强度(0.05±0.01 vs. 0.42±0.03,
F
=677.591,
P
=0.000)、细胞活力(91.30±2.39 vs. 123.74±2.60,
F
=132.696,
P
=0.000)、α-SMA(1.26±0.09 vs. 3.59±0.86,
F
=52.274,
P
=0.000)、Collagen Ⅰ(1.16±0.11 vs. 3.79±0.89,
F
=55.336,
P
=0.000)、Collagen Ⅲ(1.23±0.13 vs. 2.92±0.36,
F
=119.929,
P
=0.000)、TGF-β1(0.66±0.04 vs. 0.96±0.02,
F
=142.954,
P
=0.000)和p-SMAD3/SMAD3(0.81±0.03 vs. 1.37±0.02,
F
=739.609,
P
=0.000)的水平明显降低,而p-AMPK/AMPK的表达量在Ang Ⅱ+siE4BP4组明显高于Ang Ⅱ+E4BP4组(0.89±0.01 v
s. 0.58±0.02,
F
=284.541,
P
=0.000)。
结论
2
E4BP4是纤维化调控的关键因子,抑制其表达可通过激活AMPK进而抑制TGF-β1/SMAD3通路发挥抗纤维化作用。
Objective
2
To explore the effects of transcription factor adenovirus E4 promoter-binding protein(E4BP4) in regulating pathological myocardial fibrosis through the adenosine monophosphate-activated protein kinase(AMPK)-transforming growth factor (TGF)-β1/Smad homolog 3(SMAD3) pathway.
Methods
2
A mouse model of myocardial fibrosis was established,and the expression of E4BP4 was determined in the model group and the sham-operation group. Primary cardiac fibroblasts were isolated,cultured,activated by angiotensin Ⅱ(Ang Ⅱ),and divided into the following groups:Ang Ⅱ+E4BP4 group (transfected with E4BP4 overexpression plasmids),Ang Ⅱ+siE4BP4 group (transfected with E4BP4 interfering plasmids),Ang Ⅱ group,and control group(without Ang Ⅱ treatment). The fluorescence intensity of ɑ-smooth muscle actin(α-SMA) was determined by the immunofluorescence assay,the cell viability by the cell counting kit,the expression of E4BP4,α-SMA,collagen type Ⅰ(collagen Ⅰ),and collagen type Ⅲ(collagen Ⅲ) by polymerase chain reaction,and the protein expression of TGF-β1,AMPK,and SMAD3 by Western blot.
Results
2
Compared with the sham-operation group,the model group showed significantly increased myocardial fibrosis degree(38.46±1.21 vs. 3.39±0.39,
t
=-78.564,
P
=0.000) and E4BP4 protein expression(0.96±0.03 vs. 0.75±0.03,
t
=-11.480,
P
=0.000).
In vitro
experiments found that the mean fluorescence intensity(0.05±0.01 vs. 0.42±0.03,
F
=677.591,
P
=0.000),cell viability(91.30±2.39 vs. 123.74±2.60,
F
=132.696,
P
=0.000),and the levels of α-SMA(1.26±0.09 vs. 3.59±0.86,
F
=52.274,
P
=0.000),collagen Ⅰ(1.16±0.11 vs. 3.79±0.89,
F
=55.336,
P
=0.000),collagen Ⅲ(1.23±0.13 vs. 2.92±0.36,
F
=119.929,
P
=0.000),TGF-β1(0.66±0.04 vs. 0.96±0.02,
F
=142.954,
P
=0.000),and p-SMAD3/SMAD3(0.81±0.03 vs. 1.37±0.02,
F
=739.609,
P
=0.000) in the Ang Ⅱ+siE4BP4 group were significantly lower than those in the Ang Ⅱ+E4BP4 group. The expression of p-AMPK/AMPK in the Ang Ⅱ+siE4BP4 group was significantly higher than that in the Ang Ⅱ+E4BP4 group(0.89±0.01 vs. 0.58±0.02,
F
=284.541,
P
=0.000).
Conclusion
2
E4BP4 plays a crucial role in the regulation of fibrosis. Inhibition of E4BP4 expression exerts an anti-fibrotic effect by activating AMPK and inhibiting TGF-β1/SMAD3 pathway.
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