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Neprilysin deficiency-dependent impairment of cognitive functions in a mouse model of amyloidosis


Mohajeri, M H; Wolfer, D P (2009). Neprilysin deficiency-dependent impairment of cognitive functions in a mouse model of amyloidosis. Neurochemical Research, 34(4):717-726.

Abstract

Alzheimer's disease, responsible for the vast majority of dementia cases in the elderly population, is caused by accumulation of toxic levels of amyloid beta peptide (A beta) in the brain. Neprilysin is a major enzyme responsible for the degradation of A beta in vivo. We have previously shown that elevation of neprilysin levels in the brain delays the deposition of A beta-plaques in a mouse model of amyloidosis and that lack of neprilysin leads to increased A beta generation and to signs of incipient neurodegeneration in mouse brains. This study was designed to test whether low brain levels of neprilysin affect the amyloid pathology or perturb the learning and memory performance of mice. Double-mutated mice carrying a targeted depletion of one allele of Mme, the gene encoding neprilysin, and over-expressing human amyloid precursor protein (APP), exhibited a reinforced amyloid pathology in comparison with their APP transgenic littermates. Moreover, in contrast to their parental lines, these mice were impaired in the Morris water maze learning and memory paradigm and showed facilitated extinction in the conditioned taste aversion test. These data suggest that even a partial neprilysin deficiency, as is found during aging, exacerbates amyloid pathology and may impair cognitive functions.

Abstract

Alzheimer's disease, responsible for the vast majority of dementia cases in the elderly population, is caused by accumulation of toxic levels of amyloid beta peptide (A beta) in the brain. Neprilysin is a major enzyme responsible for the degradation of A beta in vivo. We have previously shown that elevation of neprilysin levels in the brain delays the deposition of A beta-plaques in a mouse model of amyloidosis and that lack of neprilysin leads to increased A beta generation and to signs of incipient neurodegeneration in mouse brains. This study was designed to test whether low brain levels of neprilysin affect the amyloid pathology or perturb the learning and memory performance of mice. Double-mutated mice carrying a targeted depletion of one allele of Mme, the gene encoding neprilysin, and over-expressing human amyloid precursor protein (APP), exhibited a reinforced amyloid pathology in comparison with their APP transgenic littermates. Moreover, in contrast to their parental lines, these mice were impaired in the Morris water maze learning and memory paradigm and showed facilitated extinction in the conditioned taste aversion test. These data suggest that even a partial neprilysin deficiency, as is found during aging, exacerbates amyloid pathology and may impair cognitive functions.

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Additional indexing

Other titles:Special Issue Dedicated to Dr. Akitane Mori, Guest Editors:Jiankang Liu, Midori Hiramatsu
Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Integrative Human Physiology
04 Faculty of Medicine > Institute for Regenerative Medicine (IREM)
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:6 February 2009
Deposited On:15 Jun 2009 06:54
Last Modified:05 Sep 2016 07:10
Publisher:Springer
ISSN:0364-3190
Additional Information:The original publication is available at www.springerlink.com
Publisher DOI:https://doi.org/10.1007/s11064-009-9919-6
Official URL:http://www.springerlink.com/content/k2k464731217/?sortorder=asc&p_o=10
PubMed ID:19199031

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