Heart failure and angiotensin II modulate atrial Pitx2c promotor methylation

Yu Hsun Kao, Yao Chang Chen, Chen Chih Chung, Gi Shih Lien, Shih Ann Chen, Ching Chuan Kuo, Yi Jen Chen

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Heart failure (HF) can increase atrial fibrillation and induce cardiac hypermethylation. The homeobox gene Pitx2c plays important roles in the genesis of atrial fibrillation and the promoter region of Pitx2c contains cytosine-phosphate-guanine islands. Therefore, epigenetic modification by hypermethylation may reduce Pitx2c expression in atrial myocytes. The aim of the present study were to evaluate whether HF can modulate DNA methylation of Pitx2c and the potential mechanisms involved. We used real-time polymerase chain reaction, immunoblotting and pyrosequencing to investigate RNA and protein expression, as well as the methylation of Pitx2c, in isoproterenol-induced HF, healthy rat left atria and in HL-1 cells with and without (control) exposure to angiotensin (Ang) II (0.1 and 1 μmol/L) or isoproterenol (1 or 10 μmol/L) for 24 h. The HF atrium exhibited increased Pitx2c promoter methylation with increased DNA methyltransferase (DNMT) 1 and decreased Pitx2c protein levels compared with the normal atrium. Angiotensin II (0.1 and 1 μmol/L), increased Pitx2c promoter methylation in HL-1 cells with increased DNMT1 and decreased Pitx2c and Kir2.1 protein levels compared with control cells. These effects were attenuated by the methylation inhibitor 5-aza-2′-deoxycytidine (0.1 μmol/L) and by the AngII receptor blocker losartan (10 μmol/L). However, isoproterenol (1 and 10 μmol/L) did not change the expression of the Pitx2c, DNMT1 and Kir2.1 proteins. In conclusion, HF induces Pitx2c promoter hypermethylation and AngII may contribute to the hypermethylation in HF.

Original languageEnglish
Pages (from-to)379-384
Number of pages6
JournalClinical and Experimental Pharmacology and Physiology
Volume40
Issue number6
DOIs
Publication statusPublished - Jun 2013

Keywords

  • Angiotensin II
  • Atrial fibrillation
  • Epigenetics
  • Heart failure
  • Pitx2c

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)
  • Pharmacology

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