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Epr detection of endogenous nitric oxide in postischemic heart using lipid and aqueous-soluble dithiocarbamate-iron complexes

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Abstract

Spin-trapping techniques combined with electron paramagnetic resonance (EPR) spectroscopy to measure nitric oxide (·NO) production were compared in the ischemic-reperfused myocardium for the first time, using both aqueous-soluble and lipophilic complexes of reduced iron (Fe) with dithiocarbamate derivatives. The aqueous-soluble complex of Fe and N-methyl-D-glucamine dithiocarbamate (MGD) formed MGD2-Fe-NO complex with a characteristic triplet EPR signal (aN12.5 G and giso = 2.04) at room temperature, in native isolated rat hearts following 40 min global ischemia and 15 min reperfusion. Diethyldithiocarbamate (DETC) and Fe formed in ischemic-reperfused myocardium the lipophilic DETC2-Fe-NO complex exhibiting an EPR signal (g⊥ = 2.04 and g∥ = 2.02 at 77K) with a triplet hyperfine structure at g⊥. Dithiocarbamate-Fe-NO complexes detected by both trapping agents were abolished by the ·NO synthase inhibitor, NG-nitro-L-arginine methyl ester. Quantitatively, both trapping procedures provi ded similar values for tissue ·NO production, which were observed primarily during ischemia. Postischemic hemodynamic recovery of the heart was not affected by the trapping procedure. (Mol Cell Biochem 175: 91–97, 1997)

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Authors and Affiliations

  1. Departments of Medicine and Physiology, Division of Experimental Medicine, The George Washington University Medical Center, Washington, D.C, 20037, USA

    Andrei M. Komarov, Jay H. Kramer, I. Tong Mak & William B. Weglicki

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  1. Andrei M. Komarov
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  2. Jay H. Kramer
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  3. I. Tong Mak
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  4. William B. Weglicki
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Komarov, A.M., Kramer, J.H., Mak, I.T. et al. Epr detection of endogenous nitric oxide in postischemic heart using lipid and aqueous-soluble dithiocarbamate-iron complexes. Mol Cell Biochem 175, 91–97 (1997). https://doi.org/10.1023/A:1006897530800

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