Article ID Journal Published Year Pages File Type
2190634 Journal of Molecular and Cellular Cardiology 2012 12 Pages PDF
Abstract

It is well established that inositol 1,4,5-trisphosphate (IP3) dependent Ca2 + signaling plays a crucial role in cardiomyocyte hypertrophy. However, it is not yet known whether nuclear IP3 represents a Ca2 + mobilizing pathway involved in this process. The goal of the current work was to investigate the specific role of nuclear IP3 in cardiomyocyte hypertrophic response. In this work, we used an adenovirus construct that selectively buffers IP3 in the nuclear region of neonatal cardiomyocytes. We showed for the first time that nuclear IP3 mediates endothelin-1 (ET-1) induced hypertrophy. We also found that both calcineurin (Cn)/nuclear factor of activated T Cells (NFAT) and histone deacetylase-5 (HDAC5) pathways require nuclear IP3 to mediate pathological cardiomyocyte growth. Additionally, we found that nuclear IP3 buffering inhibited insulin-like growth factor-1 (IGF-1) induced hypertrophy and prevented reexpression of fetal gene program. Together, these results demonstrated that nuclear IP3 is an essential and a conserved signal for both pathological and physiological forms of cardiomyocyte hypertrophy.

Research highlights► Nuclear IP3 activates calcineurin/NFAT pathway during cardiomyocyte hypertrophy. ► Cardiomyocyte hypertrophy requires CAMKII and HDAC-5 activation by nuclear IP3. ► Nuclear IP3 is required for pathological and physiological cardiomyocyte hypertrophy.

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Life Sciences Biochemistry, Genetics and Molecular Biology Cell Biology
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