Cited by 31Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchPI3K/AKT/mTOR signaling in cancer

PKR, a cognitive decline biomarker, can regulate translation via two consecutive molecular targets p53 and Redd1 in lymphocytes of AD patients

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Damjanac, Milena, Page, Guylène, Ragot, Stéphanie, Laborie, Guillaume, Gil, Roger, Hugon, Jacques, Paccalin, Marc·2009·Journal of Cellular and Molecular Medicine

Abstract

In Alzheimer’s disease (AD), the control of translation is dysregulated, precisely, two opposite pathways: double‐stranded RNA‐dependent protein kinase (PKR) is up‐regulated and mammalian target of rapamycin (mTOR) is down‐regulated. These biochemical alterations were found at the periphery in lymphocytes of AD patients and were significantly correlated with cognitive and memory test scores. However, the molecular crosslink between these two opposite signalling pathways remains unknown. The tumour suppressor p53 and Redd1 (regulated in development and DNA damage response) could be two downstream targets of active PKR to explain the breakdown of translation in AD patients. In this study, the protein and gene levels of p53 and Redd1 were assayed in lymphocytes of AD patients and in age‐matched controls by Western blotting and RT‐PCR. Furthermore, correlations were analysed with both the level of active PKR and the Mini Mental State Examination score (MMSE). The results show that the gene and protein levels of p53 and Redd1 were significantly increased about 1.5‐fold for both gene and Redd1 protein and 2.3‐fold for active p53 in AD lymphocytes compared to age‐matched controls. Furthermore, statistical correlations between proteins and genes suggest that active PKR could phosphorylate p53 which could induce the transcription of Redd1 gene. No correlations were found between MMSE scores and levels of p53 or Redd1, contrary to active PKR levels. PKR represents a cognitive decline biomarker able to dysregulate translation via two consecutive targets p53 and Redd1 in AD lymphocytes.

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Authors
Damjanac, M., Page, G., Ragot, S., Laborie, G., Gil, R., Hugon, J., & Paccalin, M.
Affiliations
  • Université de Poitiers (FR)
  • Centre Hospitalier Universitaire de Poitiers (FR)
  • Université Paris Cité (FR)
Venue
Journal of Cellular and Molecular Medicine
Publisher
Wiley
Published
2009-02-04
Volume
13
Issue
8b
Pages
1823-1832
ISSN
  • 1582-1838 (ISSN-L)
  • 1582-4934
OpenAlex
W2070069944
Cited by
31
References
61
Citations by year
2025: 2 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 2 · 2020: 1 · 2017: 1 · 2016: 5 · 2015: 3 · 2014: 2 · 2013: 2 · 2012: 4
FWCI
1.55
Type
journal article
Language
en
Open access
Locations
  • Journal of Cellular and Molecular Medicine (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Centre Hospitalier Universitaire de Poitiers
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
Keywords
Alzheimer's disease, PKR, p53, REDD1, translational regulation, lymphocytes, mTOR, cognitive decline biomarkers, protein phosphorylation, double-stranded RNA-dependent protein kinase, Mini-Mental State Examination
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Base Sequence, Cognition Disorders, Female, Humans, Lymphocytes, Male, Transcription Factors, Protein Biosynthesis, Blotting, Western, Signal Transduction, Biomarkers, Tumor Suppressor Protein p53, DNA Primers, eIF-2 Kinase, Reverse Transcriptase Polymerase Chain Reaction

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