Cerebral Amyloid Angiopathy and Parenchymal Amyloid Deposition in Transgenic Mice Expressing the Danish Mutant Form of Human BRI2

Overview

Journal Brain Pathol

Date 2008 Apr 16

PMID 18410407

Citations 35

Authors

Ruben Vidal

Ana G Barbeito

Leticia Miravalle

Bernardino Ghetti

Affiliations

Soon will be listed here.

Abstract

Familial Danish dementia (FDD) is an autosomal dominant neurodegenerative disease clinically characterized by the presence of cataracts, hearing impairment, cerebellar ataxia and dementia. Neuropathologically, FDD is characterized by the presence of widespread cerebral amyloid angiopathy (CAA), parenchymal amyloid deposition and neurofibrillary tangles. FDD is caused by a 10-nucleotide duplication-insertion in the BRI(2) gene that generates a larger-than-normal precursor protein, of which the Danish amyloid subunit (ADan) comprises the last 34 amino acids. Here, we describe a transgenic mouse model for FDD (Tg-FDD) in which the mouse Prnp (prion protein) promoter drives the expression of the Danish mutant form of human BRI(2). The main neuropathological findings in Tg-FDD mice are the presence of widespread CAA and parenchymal deposition of ADan. In addition, we observe the presence of amyloid-associated gliosis, an inflammatory response and deposition of oligomeric ADan. As the animals aged, they showed abnormal grooming behavior, an arched back, and walked with a wide-based gait and shorter steps. This mouse model may give insights on the pathogenesis of FDD and will prove useful for the development of therapeutics. Moreover, the study of Tg-FDD mice may offer new insights into the role of amyloid in neurodegeneration in other disorders, including Alzheimer disease.

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