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Volume 271, Number 46, Issue of November 15, 1996 pp. 29223-29230
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

Measurement of Nitric Oxide and Peroxynitrite Generation in the Postischemic Heart
EVIDENCE FOR PEROXYNITRITE-MEDIATED REPERFUSION INJURY

(Received for publication, February 21, 1996, and in revised form, September 4, 1996)

Penghai Wang and Jay L. Zweier

From the Molecular and Cellular Biophysics Laboratories, Department of Medicine, Division of Cardiology, and the Electron Paramagnetic Resonance Center, The Johns Hopkins Medical Institutions, Johns Hopkins Bayview Medical Center, Baltimore, Maryland 21224

Altered nitric oxide (NOdot ) production is a critical factor in tissue reperfusion injury; however, controversy remains regarding these alterations and how they cause injury. Since superoxide (Obardot 2) generation is triggered during the early period of reperfusion the cytotoxic oxidant peroxynitrite (ONOO-) could be formed, but it is not known if this occurs. Therefore electron paramagnetic resonance and chemiluminescence studies were performed of the magnitude and time course of NOdot , Obardot 2, and ONOO- formation in the postischemic heart. Isolated rat hearts were subjected either to normal perfusion or to reperfusion after 30 min of ischemia in the presence of the NOdot trap Fe2+-N-methyl-D-glucamine dithiocarbamate with electron paramagnetic resonance measurements performed on the effluent. Although only trace signals were present prior to ischemia, prominent NOdot adduct signals were seen during the first 2 min of reflow which were abolished by nitric oxide synthase (NOS) inhibition. Similar studies with the Obardot 2 trap 5,5-dimethyl-1-pyrroline N-oxide demonstrated a burst of Obardot 2 generation over the first 2 min of reflow. Chemiluminescence measurements using 5-amino-2,3-dihydro-1,4-phthalazinedione (luminol) demonstrated a similar marked increase in ONOO- which was blocked by NOS inhibitors or superoxide dismutase. NOS inhibition or superoxide dismutase greatly enhanced the recovery of contractile function in postischemic hearts. Immunohistology demonstrated that the ONOO--mediated nitration product nitrotyrosine was formed in postischemic hearts but not in normally perfused controls. Thus, NOdot formation is increased during the early period of reflow and reacts with Obardot 2 to form ONOO-, which results in amino acid nitration and cellular injury.


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