کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1946833 | 1537286 | 2010 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Transcriptional upregulation of calcineurin Aβ by endothelin-1 is partially mediated by calcium/calmodulin-dependent protein kinase IIδ3 in rat cardiomyocytes Transcriptional upregulation of calcineurin Aβ by endothelin-1 is partially mediated by calcium/calmodulin-dependent protein kinase IIδ3 in rat cardiomyocytes](/preview/png/1946833.png)
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.
Journal: Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms - Volume 1799, Issues 5–6, May–June 2010, Pages 429–441