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• W2004455617 abstract "1. The aim of this study was to assess whether or not vasoactive nitric oxide (NO) stores exist within vascular tissue after lipopolysaccharide (LPS)-treatment. 2. Rat thoracic aortic rings (for contraction experiments) or whole thoracic aortae (for electron paramagnetic resonance (e.p.r.) spectroscopy) were incubated for 18 h at 37 degrees C in the absence (control) or in the presence of LPS (10 micrograms ml-1), with or without L-arginine (L-Arg, 1 mM), the substrate of NO synthase (NOS) or N omega-nitro-L-arginine methyl ester (L-NAME, 1 mM), an inhibitor of NOS. 3. Incubation of rat aortic rings with LPS and L-Arg resulted in a significant decrease of the maximum contractile response to noradrenaline (NA, 3 microM). Addition of L-NAME (3 mM) enhanced contraction towards control values. After precontraction with NA and L-NAME, addition of N-acetyl-L-cysteine (NAC, 0.1 to 10 mM) evoked a concentration-dependent relaxation in rings incubated with LPS and L-Arg, but not in control rings, rings incubated with LPS in the absence of L-Arg or rings incubated with LPS in the presence of L-Arg and L-NAME. Removal of the endothelium did not significantly modify the relaxation induced by NAC. Methylene blue (3 microM), an inhibitor of the activation of guanylyl cyclase by NO, completely abolished the relaxing effect of NAC. 4. The presence of protein-bound dinitrosyl non-haem iron complexes (DNIC) was detected by e.p.r. spectroscopy in aortae incubated with LPS and L-Arg, but not in control aortae. Furthermore in LPS-treated aortae, addition of NAC (20 mM) gave rise to the appearance of an e.p.r. signal characteristic of low molecular weight DNIC. 5. These results provide evidence that, within vascular tissue, NO generated from L-Arg by LPS-induced NOS activity can be stored as protein-bound DNIC in non-endothelial cells. Upon addition of NAC, low molecular weight DNIC are released from these storage sites and induce vascular relaxation probably through guanylyl cyclase activation." @default.
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• W2004455617 date "1996-11-01" @default.
• W2004455617 modified "2023-09-30" @default.
• W2004455617 title "Evidence for N-acetylcysteine-sensitive nitric oxide storage as dinitrosyl-iron complexes in lipopolysaccharide-treated rat aorta" @default.
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• W2004455617 doi "https://doi.org/10.1111/j.1476-5381.1996.tb16034.x" @default.
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