Altered Cytoskeletal Composition and Delayed Neurite Elongation in tau45-230-Expressing Hippocampal Neurons.

Abstract:

:Calpain-mediated tau cleavage into the neurotoxic tau45-230 fragment plays an important role in Alzheimer's disease (AD). This tau fragment accumulates mainly in the cytoplasm of degenerating neurons. However, subcellular localization studies indicated that a pool of tau45-230 associates with the cytoskeleton in hippocampal neurons. In the present study, we assessed whether such localization could underlie tau45-230 neurotoxic effects. Quantitative Western blot analysis showed decreased levels of full-length tau bound to microtubules in tau45-230-expressing hippocampal neurons when compared to controls. In addition, the presence of this tau fragment induced a transient increase in tyrosinated tubulin, a marker of unstable microtubules, followed by a significant decrease in the levels of this tubulin isoform. The data obtained also showed a significant reduction in actin filaments in tau45-230-expressing neurons. These changes in microtubules and actin filaments correlated with delayed neurite elongation and axonal differentiation in the presence of this tau fragment. Together, these results suggest that tau45-230 could exert its toxic effects, at least in part, by modifying the composition of the neuronal cytoskeleton and impairing neurite elongation in neurons undergoing degeneration.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Afreen S,Ferreira A

doi

10.1016/j.neuroscience.2019.05.046

subject

Has Abstract

pub_date

2019-08-01 00:00:00

pages

1-15

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(19)30376-8

journal_volume

412

pub_type

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