Neurochemical Research

, Volume 35, Issue 4, pp 651–659

Tau Phosphorylation and Cleavage in Ethanol-Induced Neurodegeneration in the Developing Mouse Brain

  • Mariko Saito
  • Goutam Chakraborty
  • Rui-Fen Mao
  • Sun-Mee Paik
  • Csaba Vadasz
  • Mitsuo Saito
Original Paper

Abstract

Previous studies indicated that ethanol-induced neurodegeneration in postnatal day 7 (P7) mice, widely used as a model for the fetal alcohol spectrum disorders, was accompanied by glycogen synthase kinase-3β (GSK-3β) and caspase-3 activation. Presently, we examined whether tau, a microtubule associated protein, is modified by GSK-3β and caspase-3 in ethanol-treated P7 mouse forebrains. We found that ethanol increased phosphorylated tau recognized by the paired helical filament (PHF)-1 antibody and by the antibody against tau phosphorylated at Ser199. Ethanol also generated tau fragments recognized by an antibody against caspase-cleaved tau (C-tau). C-tau was localized in neurons bearing activated caspase-3 and fragmented nuclei. Over time, cell debris and degenerated projections containing C-tau appeared to be engulfed by activated microglia. A caspase-3 inhibitor partially blocked C-tau formation. Lithium, a GSK-3β inhibitor, blocked ethanol-induced caspase-3 activation, phosphorylated tau elevation, C-tau formation, and microglial activation. These results indicate that tau is phosphorylated by GSK-3β and cleaved by caspase-3 during ethanol-induced neurodegeneration in the developing brain.

Keywords

Ethanol Caspase-cleaved tau Glycogen synthase kinase-3β Neurodegeneration Developing brain Microglia 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Mariko Saito
    • 1
    • 3
  • Goutam Chakraborty
    • 1
  • Rui-Fen Mao
    • 1
  • Sun-Mee Paik
    • 1
  • Csaba Vadasz
    • 1
    • 3
  • Mitsuo Saito
    • 2
    • 3
  1. 1.Laboratory of Neurobehavior GeneticsThe Nathan S. Kline Institute for Psychiatric ResearchOrangeburgUSA
  2. 2.Division of Analytical PsychopharmacologyThe Nathan S. Kline Institute for Psychiatric ResearchOrangeburgUSA
  3. 3.Department of PsychiatryNew York University Langone Medical CenterNew YorkUSA

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