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Expression of embryonic tau protein isoforms persist during adult neurogenesis in the hippocampus

Expression of embryonic tau protein isoforms persist during adult neurogenesis in the hippocampus Tau is a microtubule‐associated protein with a developmentally regulated expression of multiple isoforms. The neonatal isoform is devoid of two amino terminal inserts and contains only three instead of four microtubule‐binding repeats (0N/3R‐τ). We investigated the temporal expression pattern of 0N‐τ and 3R‐τ in the rat hippocampus. After the decline of 0N‐ and 3R‐τ immunoreactivity during the postnatal development both isoforms remain highly expressed in a few cells residing beneath the granule cell layer. Coexpression of the polysialylated neuronal cell adhesion molecule, doublecortin, and incorporated bromodeoxyuridine showed that these cells are proliferating progenitor cells. In contrast mature granule cells express the adult tau protein isoform containing one aminoterminal insert domain (1N‐τ). Therefore a shift in tau isoform expression takes place during adult neurogenesis, which might be related to migration, differentiation, and integration in the granule cell layer. A model for studying shifts in tau isoform expression in a defined subset of neurons might help to understand the etiology of tauopathies, when isoform composition is crucial for neurodegeneration, as in Pick's disease or FTDP‐17. © 2006 Wiley‐Liss, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hippocampus Wiley

Expression of embryonic tau protein isoforms persist during adult neurogenesis in the hippocampus

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References (33)

Publisher
Wiley
Copyright
Copyright © 2007 Wiley Subscription Services
ISSN
1050-9631
eISSN
1098-1063
DOI
10.1002/hipo.20255
pmid
17183532
Publisher site
See Article on Publisher Site

Abstract

Tau is a microtubule‐associated protein with a developmentally regulated expression of multiple isoforms. The neonatal isoform is devoid of two amino terminal inserts and contains only three instead of four microtubule‐binding repeats (0N/3R‐τ). We investigated the temporal expression pattern of 0N‐τ and 3R‐τ in the rat hippocampus. After the decline of 0N‐ and 3R‐τ immunoreactivity during the postnatal development both isoforms remain highly expressed in a few cells residing beneath the granule cell layer. Coexpression of the polysialylated neuronal cell adhesion molecule, doublecortin, and incorporated bromodeoxyuridine showed that these cells are proliferating progenitor cells. In contrast mature granule cells express the adult tau protein isoform containing one aminoterminal insert domain (1N‐τ). Therefore a shift in tau isoform expression takes place during adult neurogenesis, which might be related to migration, differentiation, and integration in the granule cell layer. A model for studying shifts in tau isoform expression in a defined subset of neurons might help to understand the etiology of tauopathies, when isoform composition is crucial for neurodegeneration, as in Pick's disease or FTDP‐17. © 2006 Wiley‐Liss, Inc.

Journal

HippocampusWiley

Published: Jan 1, 2007

Keywords: ; ; ; ;

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