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

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 CaMKII delta 3 activation enhances transcription of the CaN gene through activation of the CaN-A beta subunit (CnA beta) promoter in rat cultured cardiomyocytes. Co-immunoprecipitation assays showed that MEF2 forms a complex with GATA4 following transfection of an active CaMKII delta 3 (T278D) mutant in neonatal cardiomyocytes. Inversely, transfection of a dominant negative CaMKII delta 3 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 CaMKII delta 3 (T278D) transfection. These data demonstrate that CaMKII can enhance CnA beta 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. (C) 2010 Elsevier B.V. All rights reserved.