The Na,K-ATPase is a heterodimer composed of an alpha-catalytic and a beta-glycoprotein subunit. At present, three different alpha-polypeptides (alpha1, alpha2, alpha3) and two distinct beta-isoforms (beta1 and beta2) have been detected in human heart. The aim of the present study was to determine whether or not the beta3-isoform of the Na,K-ATPase can be detected in human heart. Using the highly sensitive method of RT-PCR, we here show that human heart expresses the beta3-isoform of the Na,K-ATPase. Given the differences in pharmacological properties of the nine different Na,K-ATPase isoenzymes (containing all combinations of the subunit isoforms), the study of beta3-isoform regulation in human heart may be of interest in understanding the altered response of human myocardium to digitalis therapy during heart failure.
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