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  • Title: Developmental changes in tau phosphorylation: fetal tau is transiently phosphorylated in a manner similar to paired helical filament-tau characteristic of Alzheimer's disease.
    Author: Brion JP, Smith C, Couck AM, Gallo JM, Anderton BH.
    Journal: J Neurochem; 1993 Dec; 61(6):2071-80. PubMed ID: 8245963.
    Abstract:
    Rat and human fetal brain tau were probed with a panel of monoclonal antibodies (tau-1, AT8, 8D8, RT97, SMI31, SMI34) that distinguish between paired helical filament (PHF)-tau of Alzheimer's disease and normal adult brain tau. These antibodies discriminate between normal and PHF-tau because their epitopes are phosphorylated in PHF-tau. Although only one molecular isoform of tau was shown to be expressed in fetal brain, two fetal tau species could be distinguished on sodium dodecyl sulfate-polyacrylamide gel electrophoresis and the slower migrating species was recognized by all of the PHF-tau-specific antibodies. Moreover, this immunoreactivity was shown to be phosphorylation dependent. Our observations suggest that the abnormal phosphorylation of tau in Alzheimer's disease may be the result of reactivation of pathways governing the phosphorylation of tau in the developing brain.
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