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Article

LDH and PDH Activities in the Ischemic Brain and the Effect of Reperfusion—An Ex Vivo MR Study in Rat Brain Slices Using Hyperpolarized [1-13C]Pyruvate

1
Department of Radiology, Hadassah Medical Organization and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem 9112001, Israel
2
The Wohl Institute for Translational Medicine, Jerusalem 9112001, Israel
*
Author to whom correspondence should be addressed.
Academic Editor: Martin Maly
Metabolites 2021, 11(4), 210; https://doi.org/10.3390/metabo11040210
Received: 2 March 2021 / Revised: 25 March 2021 / Accepted: 28 March 2021 / Published: 30 March 2021
(This article belongs to the Special Issue Thrombosis and Metabolism)
Ischemic stroke is a leading cause for neurologic disability worldwide, for which reperfusion is the only available treatment. Neuroimaging in stroke guides treatment, and therefore determines the clinical outcome. However, there are currently no imaging biomarkers for the status of the ischemic brain tissue. Such biomarkers could potentially be useful for guiding treatment in patients presenting with ischemic stroke. Hyperpolarized 13C MR of [1-13C]pyruvate is a clinically translatable method used to characterize tissue metabolism non-invasively in a relevant timescale. The aim of this study was to utilize hyperpolarized [1-13C]pyruvate to investigate the metabolic consequences of an ischemic insult immediately during reperfusion and upon recovery of the brain tissue. The rates of lactate dehydrogenase (LDH) and pyruvate dehydrogenase (PDH) were quantified by monitoring the rates of [1-13C]lactate and [13C]bicarbonate production from hyperpolarized [1-13C]pyruvate. 31P NMR of the perfused brain slices showed that this system is suitable for studying ischemia and recovery following reperfusion. This was indicated by the levels of the high-energy phosphates (tissue viability) and the chemical shift of the inorganic phosphate signal (tissue pH). Acidification, which was observed during the ischemic insult, has returned to baseline level following reperfusion. The LDH/PDH activity ratio increased following ischemia, from 47.0 ± 12.7 in the control group (n = 6) to 217.4 ± 121.3 in the ischemia-reperfusion group (n = 6). Following the recovery period (ca. 1.5 h), this value had returned to its pre-ischemia (baseline) level, suggesting the LDH/PDH enzyme activity ratio may be used as a potential indicator for the status of the ischemic and recovering brain. View Full-Text
Keywords: ischemic stroke; reperfusion; lactate dehydrogenase; pyruvate dehydrogenase; dissolution dynamic nuclear polarization; brain slices ischemic stroke; reperfusion; lactate dehydrogenase; pyruvate dehydrogenase; dissolution dynamic nuclear polarization; brain slices
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MDPI and ACS Style

Sapir, G.; Shaul, D.; Lev-Cohain, N.; Sosna, J.; Gomori, M.J.; Katz-Brull, R. LDH and PDH Activities in the Ischemic Brain and the Effect of Reperfusion—An Ex Vivo MR Study in Rat Brain Slices Using Hyperpolarized [1-13C]Pyruvate. Metabolites 2021, 11, 210. https://doi.org/10.3390/metabo11040210

AMA Style

Sapir G, Shaul D, Lev-Cohain N, Sosna J, Gomori MJ, Katz-Brull R. LDH and PDH Activities in the Ischemic Brain and the Effect of Reperfusion—An Ex Vivo MR Study in Rat Brain Slices Using Hyperpolarized [1-13C]Pyruvate. Metabolites. 2021; 11(4):210. https://doi.org/10.3390/metabo11040210

Chicago/Turabian Style

Sapir, Gal, David Shaul, Naama Lev-Cohain, Jacob Sosna, Moshe J. Gomori, and Rachel Katz-Brull. 2021. "LDH and PDH Activities in the Ischemic Brain and the Effect of Reperfusion—An Ex Vivo MR Study in Rat Brain Slices Using Hyperpolarized [1-13C]Pyruvate" Metabolites 11, no. 4: 210. https://doi.org/10.3390/metabo11040210

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