Journal
JOURNAL OF NEUROCHEMISTRY
Volume 75, Issue 5, Pages 2172-2177Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1046/j.1471-4159.2000.0752172.x
Keywords
tissue plasminogen activator; amyloid; Alzheimer's disease; protease; apoptosis
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Tissue plasminogen (plgn) activator (tPA) modulates neuronal death in models of stroke, excitotoxicity, and oxidative stress. Amyloid-beta (A beta) appears central to Alzheimer's disease and is neurotoxic to neurons in vitro. Here, we evaluate tPA effects on A beta toxicity. We report that tPA alone had no effect on A beta toxicity. However, in combination with plgn, tPA reduced A beta toxicity in a robust fashion. Moreover, the combined tPA and plgn treatment markedly inhibited A beta accumulation. The addition of phenylmethylsulfonyl fluoride, a serine protease inhibitor, to a sample of tPA, plgn, and A beta resulted in a marked reduction of A beta degradation. We interpret the actions of tPA and plgn within the context of the ability of plasmin to degrade A beta.
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