Epigenetic regulation of cardiac muscle-specific genes in H9c2 cells by Interleukin-18 and histone deacetylase inhibitor m-carboxycinnamic acid bis-hydroxamide.

Abstract:

:Interleukin-18 (IL-18) elicited a robust hypertrophy response in H9c2 cardiomyocytes as judged by their accelerated rates of protein synthesis and increased cell size. Evidently, IL-18 treatment also induced a cardiac hypertrophy-specific program of gene expression in H9c2 cardiomyocytes since they elicited enhanced expression of atrial naturetic factor (ANF), desmin, and skeletal alpha-actin genes accompanied by a canonical switch in the transcription of alpha- and beta-myosin heavy chain (MyHC) genes. Co-treatment of H9c2 cells with m-carboxycinnamic acid bis-hydroxamide (CBHA), an inhibitor of histone deacetylases, significantly blocked both morphological and molecular manifestations of IL-18-induced cardiac hypertrophy in vitro. IL-18 treatment led to activation of phosphoinositide-3-kinase and phosphorylated Akt/protein kinase B, while CBHA blunted this pathway via inducing the expression of its upstream regulator, PTEN (phosphatase and tensin homolog). The architecture of bulk chromatin of H9c2 cells exposed to IL-18 and/or CBHA was significantly altered as judged by the extent of covalent modifications of its constituent histones. The chromatin immuno-precipitation (ChIP) assays revealed that IL-18-induced specific epigenetic changes in the chromatin of ANF, desmin, skeletal alpha-actin, and MyHC genes that were largely neutralized by CBHA. We demonstrate for the first time that 'histone code' of the entire approximately 50 kb genomic DNA encoding the alpha- and beta-MyHC genes and the intergenic DNA that generates anti-beta-MyHC RNA was uniquely modulated by pro- and anti-hypertrophy signals of IL-18 and CBHA, respectively.

journal_name

Mol Cell Biochem

authors

Majumdar G,Johnson IM,Kale S,Raghow R

doi

10.1007/s11010-008-9720-x

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

47-60

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

312

pub_type

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