实用医学杂志 ›› 2023, Vol. 39 ›› Issue (4): 423-429.doi: 10.3969/j.issn.1006⁃5725.2023.04.006

• 基础研究 • 上一篇    下一篇

胶原蛋白三螺旋重复序列1调控表皮生长因子受体信号通路促进高血压心肌重构形成及其机制

欧阳慎予 邵利辉 秦佩 卓晓军 牛培    

  1. 长沙市第四医院(湖南师范大学附属长沙医院)心血管内科(长沙 410006)

  • 出版日期:2023-02-25 发布日期:2023-02-25
  • 基金资助:
    湖南省卫生健康委科研课题(编号:202214012875)

CTHRC1 regulates EGFR signaling pathway to promote the formation of hypertensive myocardial remod⁃ eling and its mechanism 

OUYANG Shenyu,SHAO Lihui,QIN Pei,ZHUO Xiaojun,NIU Pei.   

  1. Department of Cardiovascular Medicine,Changsha No.4 Hospital(Changsha Hospital Affiliated to Hunan Normal University), Changsha 410006,China

  • Online:2023-02-25 Published:2023-02-25

摘要:

目的 探讨胶原蛋白三螺旋重复序列 1(CTHRC1)调控表皮生长因子受体(EGFR)信号通路 在高血压心肌重构形成中的作用及其机制。方法 SD 大鼠随机分为以下 3 组:野生型对照(WTC)组、 AngⅡ+ Stuffer 组和 AngⅡ+ CTHRC1 组,每组 10 只。AngⅡ+ Stuffer 组和 AngⅡ + CTHRC1 组大鼠分别以 1 × 1011 v.g. 的剂量通过尾静脉注射 Stuffer CTHRC1 进行预处理;注射 4 周后,大鼠接受渗透微型泵给药 AngⅡ[1.5 mg/(kg·d)]持续 4 周以发展高血压,通过经胸超声心动图无创测量心脏功能,并采用 Masson 三色染相比,AngⅡ+ stuffer 组高血压大鼠心脏组织纤维化显著增加(P < 0.05)。CTHRC1 给药进一步加 剧了高血压大鼠这些病理变化(P < 0.05)。心脏超声显示,AngⅡ+ CTHRC1 组大鼠左心室射血分数降低 和分数缩短程度较AngⅡ+ stuffer组更大(P < 0.05)。与对照组相比,AngⅡ色评估心脏纤维化。从2至3 SD 大鼠的心脏中分离出心脏成纤维细胞(CF),分为:Con 组、AngⅡ组、AngⅡ+ sh⁃NC 组、AngⅡ+ sh⁃ CTHRC1 组和 AngⅡ+ sh⁃CTHRC1 + Colivelin TFA 组。通过 CCK8 试验、伤口愈合试验评估细胞增殖、迁移, 二氢乙锭荧光染色检测活性氧(ROS)水平,蛋白质印迹分析 CTHRC1 蛋白和 EGFR/Stat3 信号通路表达。 结果 WTC 组比较,AngⅡ CF 的增殖,EGFR、Stat3 蛋白表达显著增加(P < 0.05),sh⁃CTHRC1 预处理 显著逆转了 AngⅡ诱导的 CF 增殖和 EGFR、Stat3 蛋白表达增加(P < 0.05)。AngⅡ组中 CF 迁移、ROS 水平 和纤维化相关信号(COL1A1、COL3A1、TGF⁃β)基因表达较对照组均显著增加(P < 0.05);sh⁃CTHRC1 预处 理显著逆转了 AngⅡ诱导的这些变化(P < 0.05)。此外,Colivelin TFA 加入很大程度降低了 sh⁃CTHRC1 处理对 AngⅡ诱导的有益作用(P < 0.05)。结论 CTHRC1 过表达导致高血压大鼠心脏纤维化、结构损伤 和功能障碍的增加,其作用机制与激活EGFR/Stat3信号通路介导的氧化应激有关。

关键词:

胶原蛋白三螺旋重复序列1, 高血压, 心肌重构, 表皮生长因子受体信号通路

Abstract:

Objective To investigate the role and mechanism of collagen triple helical repeat 1(CTHRC1 regulating epidermal growth factor receptor(EGFR)signaling pathway in the formation of hypertensive myocardial remodeling. Methods SD rats were randomLy divided into the following three groups:wild⁃type control(WTC group,AngⅡ + Stuffer group and AngⅡ + CTHRC1 group,10 rats in each group. Rats in the AngⅡ + Stuffer group and the AngⅡ + CTHRC1 group were pretreated by injecting Stuffer or CTHRC1 through the tail vein at a dose of 1 × 1011 v.g. respectively;after injection for 4 weeks,the rats were received AngⅡ[1.5 mg/(kg·d)]with an osmotic minipump for another 4 weeks. Cardiac function was measured non⁃invasively by transthoracic echocar⁃ diography,and the cardiac fibrosis was assessed by Masson′s trichrome staining. Cardiac fibroblasts(CF)were isolated from the hearts of 2⁃ to 3⁃day⁃old SD rats and divided into:Con group,Ang Ⅱ group,AngⅡ+ sh⁃NC group AngⅡ+ sh⁃CTHRC1 group and Ang Ⅱ group +sh⁃CTHRC1+Colivelin TFA group. Cell proliferation and migration were assessed by CCK8 assay and wound healing assay,reactive oxygen species(ROS)levels were detected by dihydroethidium fluorescence staining,and the expression of CTHRC1 protein and EGFR/Stat3 signaling pathway was analyzed by western blotting. Results Compared with the WTC group,the cardiac tissue fibrosis of the hyper⁃ tensive rats in the AngⅡ+ stuffer group significantly increased(P < 0.05). CTHRC1 administration further aggra⁃ vated these pathological changes in hypertensive rats(P < 0.05). Echocardiography showed that the left ventricularejection fraction decreased and the fractional shortening in the AngⅡ+ CTHRC1 group was greater than that in the AngⅡ+ stuffer group(P < 0.05). Compared with the control group,the proliferation of CF and the expression of EGFR and Stat3 in the Ang Ⅱ group significantly increased(P < 0.05). CF migration,ROS levels and fibrosis⁃ related signal(COL1A1,COL3A1,TGF ⁃ β)gene expression in Ang Ⅱ group significantly increased compared with those in the control group(P < 0.05);sh⁃CTHRC1 pretreatment significantly reversed these changes induced by AngⅡ(P < 0.05). Furthermore,Colivelin TFA addition largely reduced the beneficial effect of sh ⁃CTHRC1 pretreatment on Ang Ⅱ induction(P < 0.05). Conclusion CTHRC1 overexpression leads to increased cardiac fibrosis,structural damage and dysfunction in hypertensive rats,and its mechanism of action is related to oxidative stress mediated by activation of the EGFR/Stat3 signaling pathway.

Key words:

collagen triple helical repeat 1, hypertension, myocardial remodeling, EGFR signaling pathway