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. 1993 Jan;108(1):38–43. doi: 10.1111/j.1476-5381.1993.tb13436.x

Dependence of endotoxin-induced vascular hyporeactivity on extracellular L-arginine.

C A Schott 1, G A Gray 1, J C Stoclet 1
PMCID: PMC1907705  PMID: 8428212

Abstract

1. The dependence on extracellular L-arginine of vascular hyporeactivity induced by bacterial lipopolysaccharide (LPS) was studied in vivo in rats infused with LPS and in vitro in endothelium-denuded rat thoracic aortic rings exposed to LPS. 2. Infusion of LPS during 50 min at a dose of 10 mg kg-1 h-1 produced a significant impairment of the pressor effect of noradrenaline, while in tissues collected 60 min after the start of LPS infusion, no significant alteration in either plasma arginine concentration or aortic arginine content was found compared to saline-infused controls (where plasma arginine was 78.5 +/- 7 microM and aortic arginine 394 +/- 124 nmol g-1 tissue). 3. Incubation of isolated, endothelium-denuded aortic rings with LPS (10 micrograms ml-1) in the absence of L-arginine for 4 h at 37 degrees C produced a 6 fold (P < 0.01) rightward shift in the noradrenaline concentration-effect curve compared to polymyxin B (1 micrograms ml-1, a LPS neutralizing agent) and reduced by 15% the maximum observed tension. 4. The presence of L-arginine (100 microM) during the incubation with LPS and throughout the following contraction experiments caused a 15 fold (P < 0.01) increase in the EC50 of noradrenaline and greater depression (45%) of the maximum observed tension compared to polymyxin B-treated controls. Responses in control, non LPS-treated rings were unaffected by the presence of L-arginine. 5. The addition of L-arginine to rings incubated with LPS in the absence of L-arginine and maximally precontracted with noradrenaline (10 microM) induced a dose-dependent relaxation.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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