Abstract
Urotensin II (UII) is a neural hormone that induces cardiac hypertrophy and may be involved in the pathogenesis of cardiac remodeling and heart failure. Hypertrophy has been linked to histone deacetylase 5 (HDAC5) phosphorylation and nuclear factor κB (NF-κB) translocation, both of which are predominantly mediated by G protein-coupled receptor kinase 5 (GRK5). In the present study, we found that UII rapidly and strongly stimulated nuclear export of HDAC5 and nuclear import of NF-κB in H9c2 cells overexpressing the urotensin II receptor (H9c2UT). Hence, we hypothesized that GRK5 and its signaling pathway may play a role in UII-mediated cellular hypertrophy. H9c2UT cells were transduced with a GRK5 small hairpin RNA interference recombinant lentivirus, resulting in the down-regulation of GRK5. Under UII stimulation, reduced levels of GRK5 in H9c2UT cells led to suppression of UII-mediated HDAC5 phosphorylation and activation of the NF-κB signaling pathway. In contrast, UII-mediated activations of ERK1/2 and GSK3α/β were not affected by down-regulation of GRK5. In a cellular hypertrophy assay, down-regulation of GRK5 significantly suppressed UII-mediated hypertrophy of H9c2UT cells. Furthermore, UII-mediated cellular hypertrophy was inhibited by amlexanox, a selective GRK5 inhibitor, in H9c2UT cells and neonatal cardiomyocytes. Our results suggest that GRK5 may be involved in a UII-mediated hypertrophic response via activation of NF-κB and HDAC5 at least in part by ERK1/2 and GSK3α/β-independent pathways.
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This study was supported by the Bio & Medical Technology Development Program (2014-M3A9A9073788) of the National Research Foundation (NRF) funded by Korean government, Republic of Korea.
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Park, C.H., Lee, J.H., Lee, M.Y. et al. A novel role of G protein-coupled receptor kinase 5 in urotensin II-stimulated cellular hypertrophy in H9c2UT cells. Mol Cell Biochem 422, 151–160 (2016). https://doi.org/10.1007/s11010-016-2814-y
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DOI: https://doi.org/10.1007/s11010-016-2814-y