## Abstract Paired helical filaments (PHFs) are abnormal twisted filaments composed of hyperphosphorylated tau protein. They are found in Alzheimer's disease and other neurodegenerative disorders designated as tauopathies. They are a major component of intracellular inclusions known as neurofibrill
Characterization of Alzheimer paired helical filaments by electron microscopy
✍ Scribed by Félix Hernández; Tobias Engel; Alberto Gómez-Ramos; Mar Pérez; Jesús Avila
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 112 KB
- Volume
- 67
- Category
- Article
- ISSN
- 1059-910X
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✦ Synopsis
Abstract
We show how electron microscopy can be used to answer several critical issues in neurodegenerative disorders that course with the formation of aberrant filamentous structures. Thus, electron microscopy is a useful technique to study in vitro assembly of pathogenic proteins, to map the regions involved in filament formation, as well as to detect by immunoelectron microscopy which proteins bind to the filaments. Furthermore, electron microscopy is the main technique used to discover if an animal model develops fibrillar pathology and if those filaments are similar to those found in human patients. This review focuses on Alzheimer's disease and related tauopathies, although similar studies have been done with other neurodegenerative disorders as, for example, Huntington's disease. Microsc. Res. Tech. 67:121–125, 2005. © 2005 Wiley‐Liss, Inc.
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Neurofibrillar silver-stains were initially developed to delineate normal neuronal architecture (Bielschowsky, 1904) but were soon used for diagnosing the abnormal tangles and plaques in brain tissue from patients with dementia (Alzheimer, 1907). Recently, Campbell and co-workers (1987) have describ
Results of this comparative study indicated that electron microscopy of supra-ultrathin sectipns provided the best resolution; revealing the subunit structures, globules (32 A +4), and longitudinal bars (47 A f6) of paired helical filaments (PHF). A three-dimensional model of PHF substructure is the