The relationship between truncation and phosphorylation at the C-terminus of tau protein in the paired helical filaments of Alzheimer's disease.

Abstract:

:We previously demonstrated that, in the early stages of tau processing in Alzheimer's disease, the N-terminal part of the molecule undergoes a characteristic cascade of phosphorylation and progressive misfolding of the proteins resulting in a structural conformation detected by Alz-50. In this immunohistochemical study of AD brain tissue, we have found that C-terminal truncation of tau at Asp-421 was an early event in tau aggregation and analyzed the relationship between phospho-dependent tau epitopes located at the C-terminus with truncation at Glu-391. The aim of this study was to determine whether C-terminal truncation may trigger events leading to the assembly of insoluble PHFs from soluble tau aggregates present in pre-tangle cells. Our findings suggest that there is a complex interaction between phosphorylated and truncated tau species. A model is presented here in which truncated tau protein represents an early neurotoxic species while phosphorylated tau species may provide a neuroprotective role in Alzheimer's disease.

journal_name

Front Neurosci

authors

Flores-Rodríguez P,Ontiveros-Torres MA,Cárdenas-Aguayo MC,Luna-Arias JP,Meraz-Ríos MA,Viramontes-Pintos A,Harrington CR,Wischik CM,Mena R,Florán-Garduño B,Luna-Muñoz J

doi

10.3389/fnins.2015.00033

subject

Has Abstract

pub_date

2015-02-11 00:00:00

pages

33

eissn

1662-4548

issn

1662-453X

journal_volume

9

pub_type

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