Direct observation of lactate and alanine by proton double quantum spectroscopy in rat hearts supplied with [3-13C]pyruvate

Piyu Zhao, A. Dean Sherry, Craig R. Malloy, Evelyn E. Babcock

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The 13C-fractional enrichments in the lactate and alanine methyl carbon positions were determined by 1H NMR spectroscopy of extracts of rat hearts perfused with various concentrations of [3-13C]pyruvate ± unlabeled glucose or acetate. In general, the 13C-fractional enrichment of the alanine methyl carbon pool paralleled the 13C-fractional enrichment of the acetyl-CoA which entered the TCA cycle (as determined by 13C-isotopomer analysis) while the 13C-fractional enrichment of the lactate methyl carbon was always significantly lower, consistent with a pool of lactate which does not mix with exogeneous [3-13C]pyruvate. This has also been examined in intact, perfused, KCl-arrested rat hearts supplied with [3-13C]pyruvate by proton double quantum motabolite specific spectroscopy (MSS). A comparison of MSS spectra of intact hearts with one pulse spectra of extracts of those same hearts indicates there is a sizeable non-enriched pool of lactate in the intact hearts which is not visible by NMR spectroscopy.

Original languageEnglish (US)
Pages (from-to)247-250
Number of pages4
JournalFEBS Letters
Volume303
Issue number2-3
DOIs
StatePublished - Jun 1 1992

Keywords

  • C-fractional enrichment
  • MSS spectroscopy
  • NMR-invisible lactate
  • Perfused heart

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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