Evidence map›Paper›PMID 19240795›Full record

ArticlePloS one2009

Improved learning and memory in aged mice deficient in amyloid beta-degrading neutral endopeptidase.

Thomas Walther, Doris Albrecht, Matthias Becker, Manja Schubert, Elena Kouznetsova, Burkard Wiesner, Björn Maul, Reinhard Schliebs, Gisela Grecksch, Jens Furkert and 4 more

Open access · goldAbstract read
In one paragraph

Article in PloS one, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.

0numbers the graph read from it
0cells of the map it votes in
18citing papers in PubMed
1.6field-weighted citation impact, top 17% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

18 citing papers in PubMed, 35 citations in OpenAlex.

  1. Article
  2. Article
  3. Review
  4. Article
  5. Review
  6. Article
  7. Neprilysin Inhibitors and Bradykinin.Frontiers in medicine · 2018
    Review
  8. Review
  9. Green tea reduces body fat via upregulation of neprilysin.International journal of obesity (2005) · 2016
    Article
  10. Article
  11. Drosophila Neprilysins Are Involved in Middle-Term and Long-Term Memory.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2016
    Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Cognitive and cortical plasticity deficits correlate with altered amyloid-β CSF levels in multiple sclerosis.Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2011
    Article
  17. Neprilysin-2 is an important β-amyloid degrading enzyme.The American journal of pathology · 2011
    Article
  18. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

14 authors at 5 institutions in 3 countries.

Thomas WaltherDepartment of Cardiology, Charité-University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany. thomas.walther@hyms.ac.uk
Doris Albrecht
Matthias Becker
Manja Schubert
Elena Kouznetsova
Burkard Wiesner
Björn Maul
Reinhard Schliebs
Gisela Grecksch
Jens Furkert
Anja Sterner-Kock
Heinz-Peter Schultheiss
Axel Becker
Wolf-Eberhard Siems
Leibniz-Forschungsinstitut für Molekulare Pharmakologie · DECharité - Universitätsmedizin Berlin · DELeipzig University · DEOtto-von-Guericke University Magdeburg · DEFreie Universität Berlin · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundNeutral endopeptidase, also known as neprilysin and abbreviated NEP, is considered to be one of the key enzymes in initial human amyloid-beta (Abeta) degradation. The aim of our study was to explore the impact of NEP deficiency on the initial development of dementia-like symptoms in mice. METHODOLOGY/PRINCIPAL

findingsWe found that while endogenous Abeta concentrations were elevated in the brains of NEP-knockout mice at all investigated age groups, immunohistochemical analysis using monoclonal antibodies did not detect any Abeta deposits even in old NEP knockout mice. Surprisingly, tests of learning and memory revealed that the ability to learn was not reduced in old NEP-deficient mice but instead had significantly improved, and sustained learning and memory in the aged mice was congruent with improved long-term potentiation (LTP) in brain slices of the hippocampus and lateral amygdala. Our data suggests a beneficial effect of pharmacological inhibition of cerebral NEP on learning and memory in mice due to the accumulation of peptides other than Abeta degradable by NEP. By conducting degradation studies and peptide measurements in the brain of both genotypes, we identified two neuropeptide candidates, glucagon-like peptide 1 and galanin, as first potential candidates to be involved in the improved learning in aged NEP-deficient mice. CONCLUSIONS/SIGNIFICANCE: Thus, the existence of peptides targeted by NEP that improve learning and memory in older individuals may represent a promising avenue for the treatment of neurodegenerative diseases.

Indexed as

AgingAmygdalaAmyloid beta-PeptidesAnimalsDementiaGalaninGlucagon-Like Peptide 1HippocampusLearningLong-Term PotentiationMemoryMiceNeprilysinPeptide FragmentsAmyloid beta-PeptidesGalaninGlucagon-Like Peptide 1NeprilysinPeptide Fragments

Identifiers

PMID19240795
PMCPMC2643003
OpenAlexW2019034341

What OpenQuestion holds

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LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.