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Cardiac remodeling occurs after cardiac pressure/volume overload or myocardial injury during the development of heart failure and is a determinant of heart failure. Preventing or reversing remodeling is a goal of heart failure therapy. Human cardiomyocyte Na + /K + -ATPase has multiple α isoforms (1–3). The expression of the α subunit of the Na + /K + -ATPase is often altered in hypertrophic and failing hearts. The mechanisms are unclear. There are limited data from human cardiomyocytes. Abundant evidences from rodents show that Na + /K + -ATPase regulates cardiac contractility, cell signaling, hypertrophy and fibrosis. The α1 isoform of the Na + /K + -ATPase is the ubiquitous isoform and possesses both pumping and signaling functions. The α2 isoform of the Na + /K + -ATPase regulates intracellular Ca 2+  signaling, contractility and pathological hypertrophy. The α3 isoform of the Na + /K + -ATPase may also be a target for cardiac hypertrophy. Restoration of cardiac Na + /K + -ATPase expression may be an effective approach for prevention of cardiac remodeling. In this article, we will overview: (1) the distribution and function of isoform specific Na + /K + -ATPase in the cardiomyocytes. (2) the role of cardiac Na + /K + -ATPase in the regulation of cell signaling, contractility, cardiac hypertrophy and fibrosis  in vitro  and  in vivo . Selective targeting of cardiac Na + /K + -ATPase isoform may offer a new target for the prevention of cardiac remodeling.

Regulation of Cardiac Remodeling by Cardiac Na+/K+-ATPase Isoforms