title: Matrix metalloproteinase inhibition prevents oxidative stress-associated blood-brain barrier disruption after transient focal cerebral ischemia.
abstract: Oxidative stress generated during stroke is a critical event leading to blood-brain barrier (BBB) disruption with secondary vasogenic edema and hemorrhagic transformation of infarcted brain tissue, restricting the benefit of thrombolytic reperfusion. In this study, the authors demonstrate that ischemia-reperfusion-induced BBB disruption in mice deficient in copper/zinc-superoxide dismutase (SOD1) was reduced by 88% ( P < 0.0001) and 73% ( P < 0.01), respectively, after 3 and 7 hours of reperfusion occurring after 1 hour of ischemia by the inhibition of matrix metalloproteinases. Accordingly, the authors show that local metalloproteinase-generated proteolytic imbalance is more intense in ischemic regions of SOD1 mice than in wild-type litter mates. Moreover, active in situ proteolysis is, for the first time, demonstrated in ischemic leaking capillaries that produce reactive oxygen species. By showing that oxidative stress mediates BBB disruption through metalloproteinase activation in experimental ischemic stroke, this study provides a new target for future therapeutic strategies to prevent BBB disruption and potentially reperfusion-triggered intracerebral hemorrhage.
authors.affiliation: Department of Neurosurgery, Department of Neurology and Neurological Sciences, and Program in Neurosciences, Stanford University School of Medicine, Stanford, California 94305-5487, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Gasche
authors.forename: J C
authors.initials: JC
authors.lastname: Copin
authors.forename: T
authors.initials: T
authors.lastname: Sugawara
authors.forename: M
authors.initials: M
authors.lastname: Fujimura
authors.forename: P H
authors.initials: PH
authors.lastname: Chan
mesh_terms: D000818:Animals; D001812:Blood-Brain Barrier / Q000502:physiology*; D001929:Brain Edema / Q000378:metabolism; D017364:Collagenases / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004792:Enzyme Precursors / Q000037:antagonists & inhibitors / Q000378:metabolism; D018093:Gelatinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D002546:Ischemic Attack, Transient / Q000378:metabolism*; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D061965:Matrix Metalloproteinase Inhibitors; D020782:Matrix Metalloproteinases / Q000378:metabolism; D008666:Metalloendopeptidases / Q000037:antagonists & inhibitors / Q000378:metabolism; D051379:Mice; D008815:Mice, Inbred Strains; D018345:Mice, Knockout; D018384:Oxidative Stress / Q000502:physiology*; D020521:Stroke / Q000378:metabolism; D013482:Superoxide Dismutase / Q000235:genetics; D013481:Superoxides / Q000378:metabolism
chemical_list: D004791:Enzyme Inhibitors; D004792:Enzyme Precursors; D061965:Matrix Metalloproteinase Inhibitors; D013481:Superoxides; D013482:Superoxide Dismutase; D017364:Collagenases; D018093:Gelatinases; D020782:Matrix Metalloproteinases; D008666:Metalloendopeptidases; C120487:pro-matrix metalloproteinase 9; C069860:progelatinase; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9