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The transcriptional coactivator CAMTA2 stimulates cardiac growth by opposing class II histone deacetylases.

Cell. 2006 May 5;125(3):453-66
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摘要


Postnatal cardiac myocytes respond to diverse signals by hypertrophic growth and activation of a fetal gene program. In an effort to discover regulators of cardiac hypertrophy, we performed a eukaryotic expression screen for activators of the atrial natriuretic factor (ANF) gene, a cardiac-specific marker of hypertrophic signaling. We discovered that a family of transcriptional coactivators, called CAMTAs, promotes cardiomyocyte hypertrophy and activates the ANF gene, at least in part, by associating with the cardiac homeodomain protein Nkx2-5. The transcriptional activity of CAMTAs is governed by association with class II histone deacetylases (HDACs), which negatively regulate cardiac growth. Mice homozygous for a mutation in a CAMTA gene are defective in cardiac growth in response to pressure overload and neurohumoral signaling, whereas mice lacking HDAC5, a class II HDAC, are sensitized to the prohypertrophic actions of CAMTA. These findings reveal a transcriptional regulatory mechanism that modulates cardiac growth and gene expression by linking hypertrophic signals to the cardiac genome.

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