Journal
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
Volume 30, Issue 12, Pages 1939-1950Publisher
SAGE PUBLICATIONS INC
DOI: 10.1038/jcbfm.2010.45
Keywords
blood-brain barrier; copper/zinc-superoxide dismutase; hemoglobin; matrix metalloproteinases; oxidative stress
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Funding
- National Institutes of Health [PO1 NS014543, RO1 NS025372, RO1 NS036147, RO1 NS038653]
- James R. Doty Endowment
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Hemoglobin (Hb) released from extravasated erythrocytes is implicated in brain edema after intracerebral hemorrhage (ICH). Hemoglobin is a major component of blood and a potent mediator of oxidative stress after ICH. Oxidative stress and matrix metalloproteinases (MMPs) are associated with blood-brain barrier (BBB) dysfunction. This study was designed to elucidate whether Hb-induced oxidative stress contributes to MMP-9 activation and BBB dysfunction in vivo. An intracerebral injection of Hb into rat striata induced increased hydroethidine (HEt) signals in parallel with MMP-9 levels. In situ gelatinolytic activity colocalized with oxidized HEt signals in vessel walls, accompanied by immunoglobulin G leakage and a decrease in immunoactivity of endothelial barrier antigen, a marker of endothelial integrity. Administration of a nonselective MMP inhibitor prevented MMP-9 levels and albumin leakage in injured striata. Moreover, reduction in oxidative stress by copper/zinc-superoxide dismutase (SOD1) overexpression reduced oxidative stress, MMP-9 levels, albumin leakage, and subsequent apoptosis compared with wild-type littermates. We speculate that Hb-induced oxidative stress may contribute to early BBB dysfunction and subsequent apoptosis, partly through MMP activation, and that SOD1 overexpression may reduce Hb-induced oxidative stress, BBB dysfunction, and apoptotic cell death. Journal of Cerebral Blood Flow & Metabolism (2010) 30, 1939-1950; doi:10.1038/jcbfm.2010.45; published online 31 March 2010
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