Effect of lipopolysaccharide on the permeability and reactivity of the cerebral microcirculation: Role of inducible nitric oxide synthase

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62 Scopus citations

Abstract

The goal of this study was to examine the effect of lipopoly saccharide on the permeability of the blood-brain barrier and reactivity of cerebral arterioles. We examined the pial microcirculation in rats using intravital fluorescence microscopy. Permeability of the blood-brain barrier (clearance of fluorescent-labeled dextran; molecular weight 10,000 Da; FITC-dextran- 10K) and diameter of pial arterioles were measured in the absence and presence of topical application of vehicle (saline) or lipopolysaccharide (200 ng/ml). During superfusion with vehicle, clearance of FITC-dextran-10K from pial vessels was minimal, and diameter of pial arterioles remained constant. Topical application of lipopolysaccharide (200 ng/ml) produced an increase in clearance of FITC-dextran-10K and dilated pial arterioles. To determine whether lipopolysaccharide-induced changes in permeability of the blood-brain barrier and dilatation of cerebral arterioles was related to the synthesis/release of inducible nitric oxide, we examined the effects of aminoguanidine (0.5 mM). Aminoguanidine inhibited lipopolysaccharide-induced increases in permeability of the blood-brain barrier and dilatation of cerebral arterioles. The findings of the present study suggest that lipopolysaccharide increases permeability of the blood-brain barrier and diameter of pial arterioles via the activation of inducible nitric oxide synthase.

Original languageEnglish (US)
Pages (from-to)353-357
Number of pages5
JournalBrain Research
Volume792
Issue number2
DOIs
StatePublished - May 11 1998

Keywords

  • Aminoguanidine
  • Brain
  • Cerebral venule
  • FITC-dextran
  • Inducible nitric oxide
  • Pial arteriole
  • Rat

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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