Cited by 183Alzheimer's disease research and treatmentsGenomics, phytochemicals, and oxidative stressEndoplasmic Reticulum Stress and Disease

Oxidative stress involving changes in Nrf2 and ER stress in early stages of Alzheimer's disease

Open access
Mota, Sandra I., Costa, Rui O., Ferreira, Ildete L., Santana, Isabel, Caldeira, Gladys L., Padovano, Carmela, Fonseca, Ana C., Baldeiras, Inês +5 more·2015·Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease

Abstract

Oxidative stress and endoplasmic reticulum (ER) stress have been associated with Alzheimer's disease (AD) progression. In this study we analyzed whether oxidative stress involving changes in Nrf2 and ER stress may constitute early events in AD pathogenesis by using human peripheral blood cells and an AD transgenic mouse model at different disease stages. Increased oxidative stress and increased phosphorylated Nrf2 (p(Ser40)Nrf2) were observed in human peripheral blood mononuclear cells (PBMCs) isolated from individuals with mild cognitive impairment (MCI). Moreover, we observed impaired ER Ca2+ homeostasis and increased ER stress markers in PBMCs from MCI individuals and mild AD patients. Evidence of early oxidative stress defense mechanisms in AD was substantiated by increased p(Ser40)Nrf2 in 3month-old 3xTg-AD male mice PBMCs, and also with increased nuclear Nrf2 levels in brain cortex. However, SOD1 protein levels were decreased in human MCI PBMCs and in 3xTg-AD mice brain cortex; the latter further correlated with reduced SOD1 mRNA levels. Increased ER stress was also detected in the brain cortex of young female and old male 3xTg-AD mice. We demonstrate oxidative stress and early Nrf2 activation in AD human and mouse models, which fails to regulate some of its targets, leading to repressed expression of antioxidant defenses (e.g., SOD-1), and extending to ER stress. Results suggest markers of prodromal AD linked to oxidative stress associated with Nrf2 activation and ER stress that may be followed in human peripheral blood mononuclear cells.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/j.bbadis.2015.03.015

Cites

92 of 92 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Proteasome activity appears to be reduced in Alzheimer disease.

    “In fact, proteasome activity seems to be decreased in AD50–52,.”

    From Oxidative stress, dysfunctional glucose metabolism and Alzheimer disease (2019) · cites this paper as [52]

    Section 3.4 mentions the ubiquitin–proteasome pathway as a mechanism for Nrf2 degradation, but does not say its activity is reduced in Alzheimer disease. Searches for decreased proteasome activity and proteasome dysfunction found no passage in our copy addressing that claim; no page number was available. (LLM, conf=0.75)

    Experimental — accuracy not yet measured
  • Degradation of oxidatively modified proteins remains compromised in Alzheimer disease brain because 20S proteasome activities are dysfunctional, including inhibition by amyloid beta, leading to accumulation of oxidatively modified, often misfolded and dysfunctional proteins.

    “Unfortunately, degradation of oxidatively modified proteins is still compromised in AD brain as the 20S proteasome enzymatic activities are dysfunctional51,52 (including inhibition by Aβ), resulting in accumulation of oxidatively modified, often misfolded and dysfunctional proteins.”

    From Oxidative stress, dysfunctional glucose metabolism and Alzheimer disease (2019) · cites this paper as [52]

    Split into 2 atoms — 0 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 2 unverifiable. Expand the claim to see per-atom verdicts.

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Mota, S. I., Costa, R. O., Ferreira, I. L., Santana, I., Caldeira, G. L., Padovano, C., Fonseca, A. C., Baldeiras, I., Cunha, C., Letra, L., Oliveira, C. R., Pereira, C. M. F., & Rego, A. C.
Affiliations
  • Centro de Neurociências e Biologia Celular (PT)
  • Unidade Local de Saúde de Coimbra (PT)
Corresponding author
  • Pereira, Cláudia M.F.
  • Rego, Ana Cristina
Venue
Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease
Publisher
Elsevier BV
Published
2015-07
Volume
1852
Issue
7
Pages
1428-1441
ISSN
0925-4439 (ISSN-L)
OpenAlex
W2094185904
Cited by
183
References
92
Citations by year
2026: 6 · 2025: 12 · 2024: 14 · 2023: 8 · 2022: 12 · 2021: 22 · 2020: 22 · 2019: 23 · 2018: 17 · 2017: 22 · 2016: 19 · 2015: 5
FWCI
15.50
Type
journal article
Language
en
Open access
Locations
  • Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • QREN Diamarker "Desenvolvimento e Operacionalização da Investigação de Translação (DOIT)
  • Lundbeck Foundation
  • "Fundação para a Ciência e a Tecnologia (FCT), Portugal, (PEst-C/SAU/LA0001/2013-2014, SFRH/BD/43430/2008, SFRH/BPD/99219/2013, SFRH/BD/28403/2006, SFRH/BD/47573/2008)
  • FEDER
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
Keywords
Alzheimer's disease, oxidative stress, Nrf2, endoplasmic reticulum stress, mild cognitive impairment, peripheral blood mononuclear cells, 3xTg-AD mice, SOD1, ER calcium homeostasis, antioxidant defense, prodromal Alzheimer's disease, cerebral cortex
MeSH terms
Superoxide Dismutase-1, Aged, Aged, 80 and over, Alzheimer Disease, Animals, Cells, Cultured, Cerebral Cortex, Female, Humans, Male, Mice, Inbred C57BL, Middle Aged, RNA, Messenger, Superoxide Dismutase, Oxidative Stress, NF-E2-Related Factor 2, Mice, Endoplasmic Reticulum Stress, Cognitive Dysfunction

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review