© 1999 American Heart Association, Inc.
Original Contribution |
Adenylate Kinase–Catalyzed Phosphotransfer in the Myocardium
Increased Contribution in Heart Failure
From the Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minn. The current affiliation for Dr K.T. Vitkevicius is Kaunas Medical University, Kaunas, Lithiuania.
Correspondence to A. Terzic, Guggenheim-7, Mayo Clinic, Rochester, MN 55905. E-mail terzic.andre{at}mayo.edu
Abstract—Although the downregulation of creatine kinase activity has been associated with heart failure, creatine kinase–deficient transgenic hearts have a preserved contractile function. This suggests the existence of alternative phosphotransfer pathways in the myocardium, the identity of which is still unknown. In this study, we examined the contribution of adenylate kinase–catalyzed phosphotransfer to myocardial energetics. In the isolated mitochondria/actomyosin system, which possesses endogenous adenylate kinase activity in both compartments, substrates for adenylate kinase promoted the rate and amplitude of actomyosin contraction that was further enhanced by purified adenylate kinase. Inhibition of adenylate kinase activity diminished both actomyosin contraction and mitochondrial respiration, which indicated reduced energy flow between mitochondria and myofibrils. In intact myocardium, the net adenylate kinase–catalyzed phosphotransfer rate was 10% of the total ATP turnover rate as measured by 18O-phosphoryl labeling in conjunction with gas chromatography and mass spectrometry. In pacing-induced failing heart, adenylate kinase–catalyzed phosphotransfer increased by 134% and contributed 21% to the total ATP turnover. Concomitantly, the contribution by creatine kinase dropped from 89% in normal hearts to 40% in failing hearts. These phosphotransfer changes were associated with reduced levels of metabolically active ATP but maintained overall ATP turnover rate. Thus, this study provides evidence that adenylate kinase facilitates the transfer of high-energy phosphoryls and signal communication between mitochondria and actomyosin in cardiac muscle, with an increased contribution to cellular phosphotransfer in heart failure. This phosphotransfer function renders adenylate kinase an important component for optimal myocardial bioenergetics and a compensatory mechanism in response to impaired intracellular energy flux in the failing heart.
Key Words: heart failure • bioenergetics • adenylate kinase • creatine kinase • mitochondria • actomyosin
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