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A Mulsch, R Busse, S Liebau and U Forstermann
Department of Applied Physiology, University of Freiburg, Federal Republic of Germany.
LY 83583 (6-anilino-5,8-quinolinedione) has been reported to lower intracellular cyclic GMP by an unknown mechanism. The objective of the present study was to investigate the effect of LY 83583 on different types of vasorelaxation and to study its mechanism of action. Low concentrations of LY 83583 (less than or equal to 0.1 microM) inhibited endothelium-dependent relaxations of rabbit aortic strips induced by acetylcholine or by the calcium ionophore A23187. Higher concentrations (greater than or equal to 0.3 microM) were required to produce partial inhibition of relaxation to sodium nitroprusside and glyceryl trinitrate. Cyclic AMP-mediated relaxations, induced by isoprenaline or forskolin, were not affected by LY 83583 (10 microM). The site of interference of LY 83583 with endothelium-dependent relaxation was examined with endothelium-derived relaxing factor (EDRF) released from cultured endothelial cells that were grown on microcarrier beads and stimulated by superfusion with ATP or thimerosal. EDRF in the superfusate was detected by endothelium-denuded segments of rabbit femoral artery, which responded with dilation and, simultaneously, by purified soluble guanylate cyclase (GC) in test tubes, which was activated by EDRF. When LY 83583 was added to the glutathione- containing GC-assay or to the superfusate from cultured endothelial cells, it did not affect stimulation of soluble GC by EDRF but it slowly reversed the dilator response of the arterial detector segment. Superfusion of cultured endothelial cells with LY 83583 (1 microM), rapidly and reversibly inhibited EDRF release.(ABSTRACT TRUNCATED AT 250 WORDS)
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