Abstract
A multizinc finger protein, FOG-2, associates with a cardiac transcription factor, GATA-4, and represses GATA-4-dependent transcription. GATA-4 is required not only for normal heart development but is also involved in hypertrophic responses in cardiac myocytes; however, the effects of FOG-2 on these responses are unknown. The interaction of GATA-4 with a transcriptional coactivator p300 is required for its full transcriptional activity and the activation of the embryonic program during myocardial cell hypertrophy. We show here that exogenous FOG-2 represses phenylephrine-induced hypertrophic responses such as myofibrillar organization, increases in cell size, and hypertrophy-associated gene transcription. Using immunoprecipitation Western blotting, we demonstrate that FOG-2 physically interacted with p300 and reduced the binding of GATA-4 to p300. In addition, in COS7 cells, in which the function of endogenous p300 is disrupted, FOG-2 is unable to repress the GATA-4-dependent transcriptional activities; however, FOG-2 markedly repressed the p300-mediated increase in the DNA-binding and transcriptional activities of GATA-4 in these cells. Similarly, FOG-2 inhibited a phenylephrine-induced increase in the p300/GATA-4 interaction,...Continue Reading
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