This invention is generally related to novel compositions for treating or preventing heart failure. Specifically, the disclosure provides a composition comprising an amino-terminal domain of Beta.adrenergic receptor kinase-1 (Beta.ARKnt) peptide, or a nucleic acid encoding Beta.ARKnt. Further disclosed are methods of using the compositions for treating or preventing heart failure in a subject or for altering Beta.-adrenergic receptor (Beta.AR) density in a subject.