Document Detail

Control of Histone H3 Phosphorylation by CaMKII in Response to Hemodynamic Cardiac Stress.
MedLine Citation:
PMID:  25421395     Owner:  NLM     Status:  Publisher    
Heart failure is associated with the reactivation of a fetal cardiac gene program which has become a hallmark of cardiac hypertrophy and maladaptive ventricular remodeling. Yet the mechanisms that regulate this transcriptional reprogramming are not fully understood. Using mice with genetic ablation of calcium/calmodulin-dependent protein kinase II delta (CaMKIIδ), which are resistant to pathological cardiac stress, we show that CaMKIIδ regulates the phosphorylation of histone H3 at serine-10 during pressure overload hypertrophy. H3 S10 phosphorylation is strongly increased in the adult mouse heart in the early phase of cardiac hypertrophy and remains detectable during cardiac decompensation. This response correlates with up-regulation of CaMKIIδ and increased expression of transcriptional drivers of pathological cardiac hypertrophy and of fetal cardiac genes. Similar changes are detected in patients with end-stage heart failure where CaMKIIδ specifically interacts with phospho-H3. Robust H3 phosphorylation is detected in both adult ventricular myocytes and in non-cardiac cells in the stressed myocardium and these signals are abolished in CaMKIIδ deficient mice after pressure overload. Mechanistically, fetal cardiac genes are activated by increased recruitment of CaMKIIδ and enhanced H3 phosphorylation at hypertrophic promoter regions both in mice and in human failing hearts, and this response is blunted in CaMKIIδ deficient mice under stress. We also document that the chaperone protein 14-3-3 binds phosphorylated H3 in response to stress, allowing proper elongation of fetal cardiac genes by RNA polymerase II (RNAPII), as well as elongation of transcription factors regulating cardiac hypertrophy. These processes are impaired in CaMKIIδ-KO mice after pathological stress. The findings reveal a novel in vivo function of CaMKIIδ in regulating H3 phosphorylation and suggest a novel epigenetic mechanism by which CaMKIIδ controls cardiac hypertrophy.
Salma Awad; Kamar Mohamed Adib Al-Haffar; Qussay Marashly; Pearl Quijada; Muhammad Kunhi; Nadya Al-Yacoub; Fallou S Wade; Shamayel Faheem Mohammed; Fouad Al-Dayel; George Sutherland; Abdullah Assiri; Mark Sussman; Donald Bers; Waleed Al-Habeeb; Coralie Poizat
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-25
Journal Detail:
Title:  The Journal of pathology     Volume:  -     ISSN:  1096-9896     ISO Abbreviation:  J. Pathol.     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-25     Completed Date:  -     Revised Date:  2014-11-26    
Medline Journal Info:
Nlm Unique ID:  0204634     Medline TA:  J Pathol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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This article is protected by copyright. All rights reserved.
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