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Imaging Spatial Reorganization of a MAPK Signaling Pathway Using the Tobacco Transient Expression System
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Tau in MAPK activation.

Chad J Leugers1, Ju Yong Koh, Willis Hong

  • 1Department of Internal Medicine, University of Iowa Carver College of Medicine , Iowa City, IA , USA.

Frontiers in Neurology
|October 23, 2013
PubMed
Summary
This summary is machine-generated.

Phosphorylation of tau protein at Thr231 potentiates MAPK activation, a mechanism linked to Alzheimer's disease (AD) neurotoxicity. Other phosphorylation sites and tau isoforms did not enhance this activation, suggesting specific phosphorylation patterns contribute to AD pathogenesis.

Keywords:
MAPK activationNGFphosphorylationsignal transductiontau

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • The precise nature of toxic tau in Alzheimer's disease (AD) remains elusive, with ongoing debate regarding the roles of tau oligomerization versus tau phosphorylation.
  • Tau phosphorylation occurs early in AD pathogenesis and is known to disrupt neuropathogenesis.
  • Previous research indicated tau's involvement in nerve growth factor (NGF)-induced signal transduction, specifically potentiating MAPK activation through phosphorylation at Thr231.

Purpose of the Study:

  • To investigate the impact of additional disease-related tau phosphorylation sites on tau's ability to potentiate MAPK activation.
  • To compare the effects of different tau isoforms on MAPK activation.
  • To explore the potential link between tau phosphorylation, MAPK activation, and neuronal cell cycle mechanisms in AD.

Main Methods:

  • Utilized PC12-derived cells to study tau's role in NGF-induced MAPK activation.
  • Manipulated tau levels (depletion and restoration) to assess its effect on MAPK signaling.
  • Examined the influence of specific tau phosphorylation sites (Thr231 and three others) and various tau isoforms (0N3R, 2N4R, and others) on MAPK activation.

Main Results:

  • Phosphorylation of tau at Thr231 was essential for potentiating MAPK activation.
  • Phosphorylation at three other disease-related sites primarily reduced MAPK activation, with none showing potentiation.
  • Among the six brain tau isoforms, only 2N4R tau showed significantly less MAPK activation compared to 0N3R tau.

Conclusions:

  • Specific tau phosphorylation, particularly at Thr231, can enhance MAPK activation, a pathway implicated in AD.
  • Abnormal tau phosphorylation promoting MAPK activation may trigger cell cycle mechanisms in neurons, potentially leading to cell death.
  • Further research is needed to elucidate the relationship between tau oligomerization and its capacity to potentiate MAPK activation in AD.