Journal
BRAIN RESEARCH
Volume 1298, Issue -, Pages 13-23Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.brainres.2009.08.076
Keywords
Blood-brain barrier; Neutrophil; Inflammation; Hemorrhage
Categories
Funding
- Heart and Stroke Foundation of Canada
- Nova Scotia Health Research Foundation
Ask authors/readers for more resources
The blood-brain barrier (BBB) restricts solute permeability across healthy cerebral endothelial cells. However, during inflammation, permeability is increased and can lead to deleterious cerebral edema. Neutrophils are early cellular participants in acute inflammation, but their effect on BBB permeability is unclear. To study this, neutrophils were applied in a resting and activated state to in vitro and in vivo models of the BBB. In vitro, human neutrophils (5 x 10(6)/ml) were activated with tumor necrosis factor (100 U/ml) and leukotriene B-4 (10(-7) mol/l). Untreated neutrophils reduced permeability across the human brain endothelial cell line hCMEC/D3. Activated neutrophils returned permeability to baseline, an effect blocked by the reactive oxygen scavengers superoxide dismutase (10 U/ml) and catalase (1000 U/ml). In vivo, human neutrophils (2.5 x 10(5) in 4 mu l) were injected into the striatum of anesthetized juvenile Wistar rats, and BBB permeability measured 30 min later. This was compared to control injections (4 mu l) of vehicle (0.9% saline) and arachidonic acid (10(-3) mol/l). The injection generated a small hematoma around the injection tract (<3 mu l). Untreated neutrophils induced significantly lower permeability in their vicinity than activated neutrophils, with a trend to lowered permeability compared to the vehicle control. Neither untreated nor activated neutrophils induced permeability increases, while arachidonic acid increased permeability as a positive control. This study further delineates the effect of neutrophils on the BBB, and demonstrates that resting neutrophils induce acute reductions in permeability while activated neutrophils have a neutral effect. The in vivo model reiterates some aspects of acute intracerebral hemorrhage. (C) 2009 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available