Investigating Cardiac Metabolism in the Isolated Perfused Mouse Heart with Hyperpolarized [1-13C]Pyruvate and13C/31P NMR Spectroscopy

David Shaul, Gal Sapir, Naama Lev-Cohain, Jacob Sosna, J. Moshe Gomori, Rachel Katz-Brull*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Metabolism is the basis of important processes in cellular life. Characterizing how metabolic networks function in living tissues provides crucial information for understanding the mechanism of diseases and designing treatments. In this work, we describe procedures and methodologies for studying in-cell metabolic activity in a retrogradely perfused mouse heart in real-time. The heart was isolated in situ, in conjunction with cardiac arrest to minimize the myocardial ischemia and was perfused inside a nuclear magnetic resonance (NMR) spectrometer. While in the spectrometer and under continuous perfusion, hyperpolarized [1-13C]pyruvate was administered to the heart, and the subsequent hyperpolarized [1-13C]lactate and [13C]bicarbonate production rates served to determine, in real-time, the rates of lactate dehydrogenase and pyruvate dehydrogenase production. This metabolic activity of hyperpolarized [1-13C]pyruvate was quantified with NMR spectroscopy in a model free-manner using the product selective saturating-excitations acquisition approach.31 P spectroscopy was applied in between the hyperpolarized acquisitions to monitor the cardiac energetics and pH. This system is uniquely useful for studying metabolic activity in the healthy and diseased mouse heart.

Original languageAmerican English
Article numbere63188
JournalJournal of Visualized Experiments
Volume2023
Issue number194
DOIs
StatePublished - 21 Apr 2023

Bibliographical note

Publisher Copyright:
© 2023 JoVE Journal of Visualized Experiments

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