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The basal and stimulated release of the endothelium-derived relaxing factor from isolated pig coronary arteries does not interfere with the vascular release of superoxide

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Abstract

Oxygen-derived free radicals, in particular superoxide anions, are known to inactivate the endogenous vasodilator endothelium-derived relaxing factor (EDRF) which is probably identical with the gaseous radical nitric oxide. It is possible that EDRF is not the target of superoxide anions but may also be an endogenous scavenger of this radical.

Superoxide anions generated by the vessel wall were measured by a modified lucigenin-enhanced chemiluminescence technique in isolated pig coronary artery rings with intact endothelium.

The addition of bovine superoxide dismutase, a scavenger of superoxide anions, decreased the chemiluminescence signal by 40 ± 26% (mean ± SD; P < 0.05; n = 21) indicating reduced generation/release of superoxide anions. In contrast, pretreatment of coronary artery rings with diethyldithiocarbamate, an inhibitor of the intrinsic copper-zinc superoxide dismutase, increased the chemiluminescence response by 136 ± 128°10 (P < 0.05; n = 21). This increase in the chemiluminescence response induced by diethyldithiocarbamate-pretreatment was almost abolished in the presence of added bovine superoxide dismutase. Specific inhibition of the EDRF release with nitro-l-arginine (100 μM) did not affect the chemiluminescence response. On the other hand, stimulation of the EDRF release by substance P (10 nM) or addition of the endothelium-mediated relaxant bradykinin (0.1 μM) did not affect the chemiluminescence response. Stimulation of the EDRF release with serotonin (0.1 μM) significantly reduced the photon emission by 15 ± 16% (n = 27). However, this effect of serotonin on the chemiluminescence response could not be prevented by specific inhibition of the EDRF release with nitro-l-arginine (100 μM) but could be prevented by buffering the acidic serotonin solution with NaOH to pH 7.4.

Our results suggest that basal and agonist-stimulated release of EDRF in isolated pig coronary artery rings does not interfere with the basal generation/release of superoxide anions derived from the vascular wall.

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Authors and Affiliations

  1. Division of Cardiology, Hannover Medical School, Konstanty-Gutschow-Strasse 8, D-30625, Hannover, Germany

    R. P. Brandes & A. Mügge

  2. Division of Clinical Biochemistry, Hannover Medical School, Konstanty-Gutschow-Strasse 8, D-30625, Hannover, Germany

    A. Dwenger

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  1. R. P. Brandes
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  2. A. Dwenger
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  3. A. Mügge
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Correspondence to: A. Mugge at the above address

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Brandes, R.P., Dwenger, A. & Mügge, A. The basal and stimulated release of the endothelium-derived relaxing factor from isolated pig coronary arteries does not interfere with the vascular release of superoxide. Naunyn-Schmiedeberg's Arch Pharmacol 349, 183–187 (1994). https://doi.org/10.1007/BF00169835

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  • DOI: https://doi.org/10.1007/BF00169835

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