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Published 18 March 2002. doi:10.1083/jcb.200108057
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© The Rockefeller University Press, 0021-9525/2002/3/1051 $5.00
The Journal of Cell Biology, Volume 156, Number 6, March 18, 2002 1051-1063


Article

Tau blocks traffic of organelles, neurofilaments, and APP vesicles in neurons and enhances oxidative stress



K. Stamer, R. Vogel, E. Thies, E. Mandelkow and E.-M. Mandelkow

Max-Planck-Unit for Structural Molecular Biology, 22607 Hamburg, Germany

Address correspondence to Dr. Eva-Maria Mandelkow, Max-Planck-Unit for Structural Molecular Biology, Notkestrasse 85, 22607 Hamburg, Germany. Tel.: 49-40-8998-2810. Fax: 49-40-8971-6822. E-mail: mand{at}mpasmb.desy.de

We studied the effect of microtubule-associated tau protein on trafficking of vesicles and organelles in primary cortical neurons, retinal ganglion cells, and neuroblastoma cells. Tau inhibits kinesin-dependent transport of peroxisomes, neurofilaments, and Golgi-derived vesicles into neurites. Loss of peroxisomes makes cells vulnerable to oxidative stress and leads to degeneration. In particular, tau inhibits transport of amyloid precursor protein (APP) into axons and dendrites, causing its accumulation in the cell body. APP tagged with yellow fluorescent protein and transfected by adenovirus associates with vesicles moving rapidly forward in the axon (~80%) and slowly back (~20%). Both movements are strongly inhibited by cotransfection with fluorescently tagged tau (cyan fluorescent protein–tau) as seen by two-color confocal microscopy. The data suggests a linkage between tau and APP trafficking, which may be significant in Alzheimer's disease.

Key Words: axonal traffic; microtubules; tau protein; amyloid precursor protein; oxidative stress


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