Transcriptional upregulation of calcineurin Aβ by endothelin-1 is partially mediated by calcium/calmodulin-dependent protein kinase IIδ3 in rat cardiomyocytes

Ying Mei Lu, Norifumi Shioda, Yui Yamamoto, Feng Han, Kohji Fukunaga

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Ca2+/calmodulin-dependent protein kinase II (CaMKII) and calcineurin (CaN) are positive regulators of cardiac hypertrophy, but the nature of cross-talk between CaMKII and CaN signaling pathways in hypertrophic cardiomyocytes remains unclear. Here we documented that CaMKIIδ3 activation enhances transcription of the CaN gene through activation of the CaN-Aβ subunit (CnAβ) promoter in rat cultured cardiomyocytes. Co-immunoprecipitation assays showed that MEF2 forms a complex with GATA4 following transfection of an active CaMKIIδ3 (T278D) mutant in neonatal cardiomyocytes. Inversely, transfection of a dominant negative CaMKIIδ3 mutant failed to promote a MEF2-GATA4 complex. Consistent with these observations, immunocytochemistry indicated nuclear co-localization of MEF2 with GATA4 after hypertrophic agonist stimulation or CaMKIIδ3 (T278D) transfection. These data demonstrate that CaMKII can enhance CnAβ promoter activity by enhancing MEF2-GATA4 synergy, suggesting a novel mechanism for CaMKII-mediated hypertrophic signaling, which contributes to induction and development of the hypertrophic response through CaN activation.

Original languageEnglish
Pages (from-to)429-441
Number of pages13
JournalBiochimica et Biophysica Acta - Gene Regulatory Mechanisms
Volume1799
Issue number5-6
DOIs
Publication statusPublished - 2010

Keywords

  • CaMKII
  • Calcineurin
  • GATA4
  • Hypertrophy
  • MEF2c

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics

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