Embodiments of the disclosure include methods and compositions related to treating or reducing the severity or delaying the onset of one or more cardiac conditions in a mammal. In particular embodiments, the compositions concern Park2 and its use for a cardiac medical condition. In specific cases, effective amounts of Park2 polynucleotide(s) and/or Park2 polypeptide(s) are provided to an individual in need thereof, including for heart failure, for example. The administration may be locally to the heart, for example.