Regulation of cytosolic and mitochondrial oxidation via malate-aspartate shuttle: An observation using dynamic 13C NMR spectroscopy

Ming Lu, Suhanti Banerjee, Gerald M. Saidel, Xin Yu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

The malate-aspartate (M-A) shuttle provides an important mechanism of metabolic communication between the cytosol and the mitochondria. In this study, dynamic 13C NMR spectroscopy was combined with a multi-domain model of cardiacmetabolism for direct quantification ofmetabolic fluxes through the tricarboxylic acid (TCA) cycle (VTCA) and the M-Ashuttle (V M-A) in intact heart. The sensitivity of this approach to altered M-A shuttle activity was examined at different cytosolic redox states. Dynamic 13C NMR spectra were acquired from isolated rat hearts perfused with 13C labeled fatty acid at either low (fatty acid only) or high cytosolic redox state induced by exogenous glucose and lactate. VTCA and VM-A were determined by least-square fitting of the model to NMR data. Our results showed that while VTCA was similar, VM-A increased by 75% at high cytosolic redox state. Therefore, our proposed method provides the opportunity for direct quantification of metabolic communication between subcellular compartments via the M-A shuttle.

Original languageEnglish (US)
Title of host publicationOxygen Transport to Tissue XXXII
PublisherSpringer New York LLC
Pages185-192
Number of pages8
Volume701
ISBN (Print)9781441977557
DOIs
StatePublished - Aug 18 2011

Publication series

NameAdvances in Experimental Medicine and Biology
Volume701
ISSN (Print)0065-2598

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