Published online before print July 28, 2005, doi: 10.1161/01.STR.0000177517.01203.eb
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(Stroke. 2005;36:1954.)
© 2005 American Heart Association, Inc.
Original Contributions |
Tissue Plasminogen Activator Promotes Matrix Metalloproteinase-9 Upregulation After Focal Cerebral Ischemia
From the Neuroprotection Research Laboratory (K.T., T.A., E.T., K.A., S.-R.L., X.W., E.H.L.), Departments of Neurology and Radiology, Massachusetts General Hospital, and Program in Neuroscience, Harvard Medical School, Charlestown, Mass; Department of Neurosurgery (K.T.), Kinki University School of Medicine, Osaka-sayama, Japan; Cardiovascular Research Center and Department of Medicine (D.N.A., P.L.H.), Massachusetts General Hospital and Harvard Medical School, Charlestown, Mass; Department of Life Science (S.-R.L.), Cheju National University, Korea; and Neurovascular Research Laboratory and the Stroke Unit (J.M.), Hospital Universitario Vall d’Hebron, Barcelona, Spain.
Correspondence to Eng H. Lo, Neuroprotection Research Laboratory, Harvard Medical School, MGH E 149-2401, Charlestown, MA 02129. E-mail lo{at}helix.mgh.harvard.edu
Background and Purpose— Thrombolytic therapy with tissue plasminogen activator (tPA) in ischemic stroke is limited by increased risks of cerebral hemorrhage and brain injury. In part, these phenomena may be related to neurovascular proteolysis mediated by matrix metalloproteinases (MMPs). Here, we used a combination of pharmacological and genetic approaches to show that tPA promotes MMP-9 levels in stroke in vivo.
Methods— In the first experiment, spontaneously hypertensive rats were subjected to 3 hours of transient focal cerebral ischemia. The effects of tPA (10 mg/kg IV) on ischemic brain MMP-9 levels were assessed by zymography. In the second experiment, wild-type (WT) and tPA knockout mice were subjected to 2 hours of transient focal cerebral ischemia, and MMP-9 levels and brain edema during reperfusion were assessed. Phenotype rescue was performed by administering tPA to the tPA knockout mice.
Results— In the first experiment, exogenous tPA did not change infarct size but amplified MMP-9 levels in ischemic rat brain at 24 hours. Coinfusion of the plasmin inhibitor tranexamic acid (300 mg/kg) did not ameliorate this effect, suggesting that it was independent of plasmin. In the second experiment, ischemic MMP-9 levels, infarct size, and brain edema in tPA knockouts were significantly lower than WT mice. Administration of exogenous tPA (10 mg/kg IV) did not alter infarction but reinstated the ischemic MMP-9 response back up to WT levels and correspondingly worsened edema.
Conclusions— These data demonstrate that tPA upregulates brain MMP-9 levels in stroke in vivo, and suggest that combination therapies targeting MMPs may improve tPA therapy.
Key Words: blood–brain barrier • brain edema • metalloproteinases • mice • tissue plasminogen activator
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