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(Circulation. 2005;111:988-995.)
© 2005 American Heart Association, Inc.

Heart Failure

Increased Nitration of Sarcoplasmic Reticulum Ca²⁺-ATPase in Human Heart Failure

Andrew J. Lokuta, PhD; Nathan A. Maertz, BS; Sivan Vadakkadath Meethal, PhD; Katherine T. Potter, MS; Timothy J. Kamp, MD, PhD; Héctor H. Valdivia, MD, PhD; Robert A. Haworth, PhD

From the Departments of Physiology (A.J.L., N.A.M., H.H.V.), Surgery (S.V.M., K.T.P., R.A.H.), and Medicine (T.J.K.), University of Wisconsin, Madison.

Correspondence to Dr Robert A. Haworth, Department of Surgery, University of Wisconsin Clinical Sciences Center, 600 Highland Ave, Madison, WI 53792. E-mail haworth{at}surgery.wisc.edu

Received May 13, 2004; revision received November 17, 2004; accepted November 19, 2004.

Background— Reduced sarcoplasmic reticulum (SR) Ca²⁺-ATPase (SERCA2a isoform) activity is a major determinant of reduced contractility in heart failure. Ca²⁺-ATPase inactivation can occur through SERCA2a nitration. We therefore investigated the role of SERCA2a nitration in heart failure.

Methods and Results— We measured SERCA2a levels and nitrotyrosine levels in tissue from normal and failing human hearts using Western blots. We found that nitrotyrosine levels in idiopathic dilated cardiomyopathic (DCM) hearts were almost double those of control hearts in age-matched groups. Nitrotyrosine was dominantly present in a single protein with the molecular weight of SERCA2a, and immunoprecipitation confirmed that the protein recognized by the nitrotyrosine antibody was SERCA2a. There was a positive correlation between the time to half relaxation and the nitrotyrosine/SERCA2a content (P<0.01) in myocytes isolated from control and DCM hearts. In experiments with isolated SR vesicles from porcine hearts, we also showed that the Ca pump is inactivated by peroxynitrite exposure, and inactivation was prevented by protein kinase A pretreatment.

Conclusions— We conclude that SERCA2a inactivation by nitration may contribute to Ca pump failure and hence heart failure in DCM.

Key Words: heart failure • sarcoplasmic reticulum • calcium • nitric oxide

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