GATA4 and cardiac hypertrophy: KLF15 is expressed in cardiomyocytes and acts as a repressor of pathological cardiac hypertrophy (Wang et al., 2008, Fisch et al., 2007, Haldar et al., 2010, Leenders et al., 2012) through inhibition of the cardiac transcriptional factors GATA4 and MEF2 (Fisch et al., 2007).