In vivo spin trapping of nitric oxide in mice

Andrei Komarov, David Mattson, Mark M. Jones, P. K. Singh, Ching San Lai

Research output: Contribution to journalArticle

175 Scopus citations

Abstract

We report here an in vivo spin-trapping technique combined with electron paramagnetic resonance (EPR) spectroscopy to measure nitric oxide (·NO) production in the blood circulation of conscious mice. The method is based on the trapping of nitric oxide (·NO) by a metal-chelator complex consisting of N-methyl-D-glucamine dithiocarbamate (MGD) and reduced iron (Fe2+) to form a stable and water-soluble [(MGD)2-Fe2+-NO] complex, which gives rise to a characteristic three-line EPR spectrum of a mononitrosyl-Fe2+ complex (aN= 12.5 G and giso=2.04) at ambient temperatures. After simultaneous intravenous injection of sodium nitroprusside (an ·NO donor) and the [(MGD)2-Fe2+] complex into the lateral vein of the mouse tail, the appearance of the three-line spectrum in the blood circulation of the mouse tail was monitored continuously by using an S-band EPR spectrometer, operating at 3.5 GHz. This represents the first spin trapping of ·NO in living animals.

Original languageEnglish (US)
Pages (from-to)1191-1198
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume195
Issue number3
DOIs
StatePublished - Sep 30 1993
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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