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Tissue Transglutaminase and Its Product Isopeptide Are Increased in Alzheimer's Disease and APPswe/PS1dE9 Double Transgenic Mice Brains.

Abstract：

:Alzheimer's disease (AD) is characterized by intracellular and extracellular protein aggregates, including microtubule-associated protein tau and cleavage product of amyloid precursor protein, β-amyloid (Aβ). Tissue transglutaminase (tTG) is a calcium-dependent enzyme that cross-links proteins forming a γ-glutamyl-ε-lysine isopeptide bond. Highly resistant to proteolysis, this bond can induce protein aggregation and deposition. We set out to determine if tTG may play a role in pathogenesis of AD. Previous studies have shown that tTG and isopeptide are increased in advanced AD, but they have not addressed if this is an early or late feature of AD. In the present study, we measured tTG expression levels and enzyme activity in the brains of individuals with no cognitive impairment (NCI), mild cognitive impairment (MCI), and AD, as well as a transgenic mouse model of AD. We found that both enzyme expression and activity were increased in MCI as well as AD compared to NCI. In the transgenic model of AD, tTG expression and enzyme activity increased sharply with age and were relatively specific for the hippocampus. We also assessed overlap of isopeptide immunoreactivity with neurodegeneration-related proteins with Western blots and found neurofilament, tau, and Aβ showed co-localization with isopeptide in both AD and transgenic mice. These results suggest that tTG might be a key factor in pathogenesis of abnormal protein aggregation in AD.

journal_name

Mol Neurobiol

journal_title

Molecular neurobiology

authors

Zhang J,Wang S,Huang W,Bennett DA,Dickson DW,Wang D,Wang R

doi

10.1007/s12035-015-9413-x

subject

Has Abstract

pub_date

2016-10-01 00:00:00

pages

5066-78

issue

8

eissn

0893-7648

issn

1559-1182

pii

10.1007/s12035-015-9413-x

journal_volume

53

pub_type

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