Intracortical hemorrhage injury in rats : relationship between blood fractions and brain cell death.
OBJECTIVE
Intracerebral hemorrhage is associated with stroke and head trauma. The purposes of this study were to investigate the effect of intracortical injections of autologous whole blood and blood components on inflammatory cell infiltration and brain cell death and to determine if nonhemorrhagic lesions differ in these respects.


METHODS
Eighty-seven adult rats were subjected to intracortical injections of autologous whole blood or allogeneic plasma, erythrocytes, leukocytes, "activated" leukocytes, and serum. Injections of saline or mineral oil were controls. Blood injections were compared with cortical freeze injury and pial devascularization. Rats were perfusion-fixed 48 hours after injection or lesioning. Eosinophilic neurons, TUNEL-positive cells, brain damage area, infiltrating neutrophils, and CD8a-immunoreactive lymphocytes were quantified.


RESULTS
Damage area, dying cells, and inflammatory infiltrate were significantly greater after autologous whole blood, leukocyte, and "activated" leukocyte injections than injection of other fractions.


CONCLUSIONS
These results suggest that extravasated whole blood causes a greater degree of cortical cell death and inflammation than ischemic lesions of similar size. Leukocytes "activated" by systemic illness might exacerbate the injury. Secondary hemorrhagic phenomena suggest that the harmful effect is directed toward both brain cells and the vasculature. Further studies are required to delineate the mechanism(s).
Xue
M
M
Department of Pathology, Faculty of Medicine, University of Manitoba, Winnipeg, Canada.
Del Bigio
M R
MR
D000818:Animals; D016913:Blood Component Transfusion; D002452:Cell Count; D016923:Cell Death; D002540:Cerebral Cortex / Q000098:blood supply / Q000473:pathology*; D002543:Cerebral Hemorrhage / Q000276:immunology / Q000473:pathology*; D004660:Encephalitis / Q000276:immunology / Q000473:pathology; D005615:Freezing; D006406:Hematoma / Q000276:immunology / Q000473:pathology*; D020287:In Situ Nick-End Labeling; D008297:Male; D009504:Neutrophils / Q000276:immunology; D010841:Pia Mater / Q000098:blood supply / Q000473:pathology; D051381:Rats; D017207:Rats, Sprague-Dawley