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- W2016871192 abstract "Ca(2+) signaling through CaMKII is critical in regulating myocyte function with regard to excitation-contraction-relaxation cycles and excitation-transcription coupling. To investigate the role of nuclear CaMKII in cardiac function, transgenic mice were designed and generated to target the expression of a CaMKII inhibitory peptide, AIP (KKALRRQEAVDAL), to the nucleus. The transgenic construct consists of the murine alpha-myosin heavy chain promoter followed by the expression unit containing nucleotides encoding a four repeat concatemer of AIP (AIP(4)) and a nuclear localization signal (NLS). Western blot and immunohistochemical analyses demonstrate that AIP(4) is expressed only in the nucleus of cardiac myocytes of the transgenic mice (NLS-AIP(4)). The function of cytoplasmic CaMKII is not affected by the expression of AIP(4) in the nucleus. Inhibition of nuclear CaMKII activity resulted in reduced translocation of HDAC5 from nucleus to cytoplasm in NLS-AIP(4) mouse hearts. Loss of nuclear CaMKII activity causes NLS-AIP(4) mice to have smaller hearts than their nontransgenic littermates. Transcription factors including CREB and NFkappaB are not regulated by cardiac nuclear CaMKII. With physiological stresses such as pregnancy or aging (8 months), NLS-AIP(4) mice develop hypertrophy symptoms including enlarged atria, systemic edema, sedentariness, and morbidity. RT-PCR analyses revealed that the hypertrophic marker genes, such as ANF and beta-myosin heavy chain, were upregulated in pregnancy stressed mice. Our results suggest that absence of adequate Ca2+signaling through nuclear CaMKII regulated pathways leads to development of cardiac disease." @default.
- W2016871192 created "2016-06-24" @default.
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- W2016871192 date "2006-11-01" @default.
- W2016871192 modified "2023-09-25" @default.
- W2016871192 title "Nuclear Ca2+/calmodulin-dependent protein kinase II in the murine heart" @default.
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- W2016871192 doi "https://doi.org/10.1016/j.bbamcr.2006.09.029" @default.
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