Abstract:
PURPOSE:The diseased myocardium lacks metabolic flexibility and responds to stimuli differently compared with healthy hearts. Here, we report the use of hyperpolarized 13C NMR spectroscopy to detect sudden changes in cardiac metabolism in isolated, perfused rat hearts in response to adrenergic stimulation. METHODS:Metabolism of hyperpolarized [1-(13)C]pyruvate was investigated in perfused rat hearts. The hearts were stimulated in situ by isoproterenol shortly after the administration of hyperpolarized [1-(13)C]pyruvate. The hyperpolarized 13C NMR results were corroborated with 1H NMR spectroscopy of tissue extracts. RESULTS:Addition of isoproterenol to hearts after equilibration of hyperpolarized [1-(13)C]pyruvate into the existing lactate pool resulted in a sudden, rapid increase in hyperpolarized [1-(13)C]lactate signal within seconds after exposure to drug. The hyperpolarized H(13)CO3 (-) and hyperpolarized [1-(13)C]alanine signals were not affected by the isoproterenol-induced elevated cardiac workload. Separate experiments confirmed that the new hyperpolarized [1-(13)C]lactate signal that arises after stimulation by isoproterenol reflects a sudden increase in total tissue lactate derived from glycogen. CONCLUSION:These results suggest that hyperpolarized pyruvate and 13C MRS may be useful for detecting abnormal glycogen metabolism in intact tissues.
journal_name
Magn Reson Medjournal_title
Magnetic resonance in medicineauthors
Khemtong C,Carpenter NR,Lumata LL,Merritt ME,Moreno KX,Kovacs Z,Malloy CR,Sherry ADdoi
10.1002/mrm.25419subject
Has Abstractpub_date
2015-08-01 00:00:00pages
312-9issue
2eissn
0740-3194issn
1522-2594journal_volume
74pub_type
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