河北医科大学学报

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HERC2通过激活PI3K-AKT信号促进心肌细胞肥大

  

  1. 1.河北医科大学第二医院心脏大血管外科,河北 石家庄 050000;2.河北省石家庄市中医院心病一科,河北 石家庄 050051
  • 出版日期:2020-06-25 发布日期:2020-06-29
  • 作者简介:高伟年(1983-),男,河北秦皇岛人,河北医科大学第二医院主治医师,医学硕士,从事心胸外科疾病诊治研究。
  • 基金资助:
    河北省医学科学研究课题计划(20190058)

HERC2 promotes cardiomyocyte hypertrophy via activating PI3K-AKT pathway#br#

  1. 1.Department of Cardiac Macrovascular Surgery, the Second Hospital of Hebei Medical University,
    Shijiazhuang 050000, China; 2.First Department of Cardiology, Shijiazhuang Traditional Chinese
    Medicine Hospital, Hebei Province, Shijiazhuang 050051, China
  • Online:2020-06-25 Published:2020-06-29

摘要: 目的 探讨HECT和RLD结构域的E3连接酶2(HECT and RLD domain containing E3 ubiquitin protein ligase 2, HERC2)在心肌肥厚中的功能与机制。
方法 选取心肌肥厚患者和对照组心肌组织,实时荧光定量逆转录聚合酶链反应(quantitative reverse transcription-polymerase chain reaction,qRT-PCR)分析心肌肥厚标志基因及HERC2基因表达水平。在SD大鼠中用血管紧张素Ⅱ诱导心肌肥厚,qRT-PCR分析心肌组织中心肌肥厚标志基因与HERC2基因表达水平。取SD乳鼠心肌细胞,siRNA干扰HERC2表达后用血管紧张素Ⅱ诱导心肌细胞肥大,分析心肌细胞大小及心肌肥厚标志基因表达水平,Western blot分析磷脂肌醇-3激酶/AKT丝氨酸-苏氨酸激酶(phosphatidylinositol 3-kinase/AKT serine/threonine kinase,PI3K-AKT)信号活化水平。
结果 与对照组相比,心肌肥厚患者心肌组织中HERC2表达水平明显增加。在血管紧张素Ⅱ诱导的心肌肥厚大鼠心肌组织中,HERC2基因表达水平同样显著增加。在大鼠心肌细胞中干扰HERC2表达可以抑制血管紧张素Ⅱ诱导的心肌细胞面积增大,抑制心肌肥厚相关标志基因心房利钠肽、脑钠肽和肌球蛋白重链7的表达。
结论 HERC2在心肌肥厚过程中高表达,HERC2可以通过调控PI3K-AKT信号通路促进心肌细胞肥大。

关键词: 心肌病, 肥厚性, 血管紧张素Ⅱ, 磷酸肌醇3-激酶

Abstract: Objective To investigate the roles and mechanism of HECT and RLD domain containing E3 ubiquitin protein ligase 2(HERC2) in cardiac hypertrophy.
Methods The expression of hypertrophic genes and HERC2 were analyzed in the myocardial tissues from patients with hypertrophic cardiomyopathy and the controls by quantitative reverse transcription-polymerase chain reaction(qRT-PCR). Cardiac hypertrophy was induced in rat with angiotensin Ⅱ, and the expression of hypertrophic genes and HERC2 was analyzed. siRNA was used to knock down HERC2 in cardiomyocytes and cardiomyocyte hypertrophy was induced with angiotensin Ⅱ. Then, the cardiomyocyte size, expression of hypertrophic genes and activation of the phosphatidylinositol 3-kinase/AKT serine/threonine kinase(PI3K-AKT) signaling were analyzed.
Results The expressions of HERC2 were significantly upregulated in the myocardial tissues of patients with hypertrophic cardiomyopathy compared with the controls. The overexpression of HERC2 was also observed in rat cardiac hypertrophy induced by angiotensin Ⅱ. Knockdown of HERC2 with siRNA repressed angiotensin Ⅱ-induced increase in cardiomyocyte size and expression of hypertrophic genes natriuretic peptide A, natriuretic peptide B and myosin heavy chain 7.
Conclusion HERC2 is highly expressed in the process of cardiac hypertrophy. HERC2 can promote cardiac hypertrophy by regulating PI3K-Akt signaling pathway.

Key words: cardiomyopathy, hypertrophic, angiotensin Ⅱ, phosphatidylinositol 3-Kinase