Multiple quantum filtered 23Na NMR spectroscopy of the isolated, perfused rat liver

Jean Marie Colet, Navin Bansal, Craig R. Malloy, A. Dean Sherry

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Isolated, perfused rat livers were examined by single-quantum (SQ) and double-quantum-filtered (DQ-filtered) 23Na spectroscopy during prolonged global ischemia and during perfusion with ouabain, low-buffer potassium, or lithium-enriched buffer. Baseline separation of the intracellular (Na(i)+) and extracellular (Na(e)+) sodium resonances using TmDOTP5- allowed a direct comparison of temporal changes in SQ versus DQ-filtered Na(i)+. The SQ Na(i)+ signal increased ~150% during the first 15 min of global ischemia and then remained relatively constant over the next 45 min, while the DQ- filtered signal steadily increased ~400% over the same 60 min period. In similar experiments in which all perfusate sodium was replaced by lithium, the DQ-filtered Na(i)+ signal increased ~180% over a similar period of ischemia. Exposure of livers to ouabain also resulted in larger increases in DQ-filtered versus SQ signal of Na(i)+. The ~290% increase in DQ-filtered sodium observed during perfusion of livers with a hypokalemic buffer (1.2 mM K+) could be completely reversed by continued perfusion with a buffer containing normal levels of K+ (4.7 mM). These data suggest that the DQ- filtered Na(i)+ signal of liver does not simply report an increase in [Na(i)+], but may be exquisitely sensitive to other intracellular events initiated by altered physiology.

Original languageEnglish (US)
Pages (from-to)1127-1135
Number of pages9
JournalMagnetic resonance in medicine
Volume41
Issue number6
DOIs
StatePublished - 1999

Keywords

  • Multiple quantum filtered NMR
  • Na MRS
  • Perfused liver
  • Shift reagent

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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