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The Journal of Neuroscience, October 1, 2001, 21(19):7724-7732
Effects of Matrix Metalloproteinase-9 Gene Knock-Out on the
Proteolysis of Blood-Brain Barrier and White Matter Components after
Cerebral Ischemia
Minoru
Asahi1,
Xiaoying
Wang1,
Tatsuro
Mori1,
Toshihisa
Sumii1,
Jae-Chang
Jung2,
Michael A.
Moskowitz3,
M. Elizabeth
Fini2, and
Eng H.
Lo1
1 Neuroprotection Research Laboratory, Departments of
Neurology and Radiology, Massachusetts General Hospital, and Program in
Neuroscience, Harvard Medical School, Charlestown, Massachusetts 02129, 2 Vision Research Laboratories, New England Eye Center,
Tufts University, Boston, Massachusetts 02111, and 3 Stroke
and Neurovascular Regulation Laboratory, Massachusetts General Hospital
and Harvard Medical School, Charlestown, Massachusetts 02129
Deleterious processes of extracellular proteolysis may contribute
to the progression of tissue damage after acute brain injury. We
recently showed that matrix metalloproteinase-9 (MMP-9)
knock-out mice were protected against ischemic and traumatic
brain injury. In this study, we examined the mechanisms involved by
focusing on relevant MMP-9 substrates in blood-brain barrier, matrix,
and white matter. MMP-9 knock-out and wild-type mice were subjected to
transient focal ischemia. MMP-9 levels increased after ischemia in
wild-type brain, with expression primarily present in vascular endothelium. Western blots showed that the blood-brain
barrier-associated protein and MMP-9 substrate zonae occludens-1
was degraded after ischemia, but this was reduced in knock-out mice.
There were no detectable changes in another blood-brain
barrier-associated protein, occludin. Correspondingly, blood-brain
barrier disruption assessed via Evans Blue leakage was significantly
attenuated in MMP-9 knock-out mice compared with wild types. In white
matter, ischemic degradation of the MMP-9 substrate myelin basic
protein was significantly reduced in knock-out mice compared with wild
types, whereas there was no degradation of other myelin proteins that
are not MMP substrates (proteolipid protein and DM20). There were no
detectable changes in the ubiquitous structural protein actin or the
extracellular matrix protein laminin. Finally, 24 hr lesion volumes
were significantly reduced in knock-out mice compared with wild types.
These data demonstrate that the protective effects of MMP-9 gene
knock-out after transient focal ischemia may be mediated by reduced
proteolytic degradation of critical blood-brain barrier and white
matter components.
Key words:
stroke; extracellular proteolysis; blood-brain barrier; myelin; neuroprotection; mouse
Copyright © 2001 Society for Neuroscience 0270-6474/01/21197724-09$05.00/0
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