MAOB and cardiac hypertrophy: Data on MAO-dependent effects on myocardial hypertrophy are supported by the measured alterations in protein kinase activity; while PAB increased the activity of redox-sensitive protein kinases involved in hypertrophic growth [31,33], this effect of PAB was blunted in the myocardium from mice with the cardiomyocyte-specific knockout of MAO-B.