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 language | American English |
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Article number | e63188 |
Journal | Journal of Visualized Experiments |
Volume | 2023 |
Issue number | 194 |
DOIs | |
State | Published - Apr 2023 |
Bibliographical note
Funding Information:grant agreement No. 858149 (AlternativesToGd).
Funding Information:
Union's Horizon 2020 research and innovation program under
Funding Information:
This project received funding from the Israel Science Foundation under grant agreement No. 1379/18; the Jabotinsky Scholarship of the Israeli Ministry of Science and Technology for Applied and Engineering Sciences for Direct PhD Students No. 3-15892 for D.S.; and the European
Publisher Copyright:
© 2023 JoVE Journal of Visualized Experiments