Evidence map›Paper›PMID 34258378›Full record

ArticleAlzheimer's & dementia (Amsterdam, Netherlands)2021

Brain correlates of urban environmental exposures in cognitively unimpaired individuals at increased risk for Alzheimer's disease: A study on Barcelona's population.

Carles Falcón, Mireia Gascon, José Luis Molinuevo, Grégory Operto, Marta Cirach, Xavier Gotsens, Karine Fauria, Eider M Arenaza-Urquijo, Jesús Pujol, Jordi Sunyer and 4 more

Open access · goldAbstract read
In one paragraph

Article in Alzheimer's & dementia (Amsterdam, Netherlands), 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
12citing papers in PubMed, 2 pooled it
3.8field-weighted citation impact, top 7% 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

12 citing papers in PubMed, 2 syntheses or guidelines pooled it, 18 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Urban greenspace and dementia: Measures, mechanisms, and methodological guidance.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2026
    Review
  4. Review
  5. Article
  6. Article
  7. Review
  8. Air Pollution-Related Neurotoxicity Across the Life Span.Annual review of pharmacology and toxicology · 2023
    Review
  9. Article
  10. Article
  11. Article
  12. 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.

Carles FalcónBarcelonaβeta Brain Research Center (BBRC) Pasqual Maragall Foundation Barcelona Spain.
Mireia GasconISGlobal Barcelona Spain.
José Luis MolinuevoBarcelonaβeta Brain Research Center (BBRC) Pasqual Maragall Foundation Barcelona Spain.
Grégory OpertoBarcelonaβeta Brain Research Center (BBRC) Pasqual Maragall Foundation Barcelona Spain.
Marta CirachISGlobal Barcelona Spain.
Xavier GotsensBarcelonaβeta Brain Research Center (BBRC) Pasqual Maragall Foundation Barcelona Spain.
Karine FauriaBarcelonaβeta Brain Research Center (BBRC) Pasqual Maragall Foundation Barcelona Spain.
Eider M Arenaza-UrquijoBarcelonaβeta Brain Research Center (BBRC) Pasqual Maragall Foundation Barcelona Spain.
Jesús PujolMRI Research Unit, Department of Radiology Hospital del Mar Barcelona Spain.
Jordi SunyerISGlobal Barcelona Spain.
Mark J NieuwenhuijsenISGlobal Barcelona Spain.
Juan Domingo GispertBarcelonaβeta Brain Research Center (BBRC) Pasqual Maragall Foundation Barcelona Spain.ORCID https://orcid.org/0000-0002-6155-0642
Marta Crous-BouBarcelonaβeta Brain Research Center (BBRC) Pasqual Maragall Foundation Barcelona Spain.
ALFA Study
Universitat Pompeu Fabra · ESPasqual Maragall Foundation · ESBiomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine · ESCentro de Investigación Biomédica en Red de Salud Mental · ESHarvard University · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionUrban environmental exposures might contribute to the incidence of Alzheimer's disease (AD). Our aim was to identify structural brain imaging correlates of urban environmental exposures in cognitively unimpaired individuals at increased risk of AD.

methodsTwo hundred twelve participants with brain scans and residing in Barcelona, Spain, were included. Land use regression models were used to estimate residential exposure to air pollutants. The daily average noise level was obtained from noise maps. Residential green exposure indicators were also generated. A cerebral 3D-T1 was acquired to obtain information on brain morphology. Voxel-based morphometry statistical analyses were conducted to determine the areas of the brain in which regional gray matter (GM) and white matter (WM) volumes were associated with environmental exposures.

resultsExposure to nitrogen dioxide was associated with lower GM volume in the precuneus and greater WM volume in the splenium of the corpus callosum and inferior longitudinal fasciculus. In contrast, exposure to fine particulate matter was associated with greater GM in cerebellum and WM in the splenium of corpus callosum, the superior longitudinal fasciculus, and cingulum cingulate gyrus. Noise was positively associated with WM volume in the body of the corpus callosum. Exposure to greenness was associated with greater GM volume in the middle frontal, precentral, and the temporal pole. DISCUSSION: In cognitively unimpaired adults with increased risk of AD, exposure to air pollution, noise, and green areas are associated with GM and WM volumes of specific brain areas known to be affected in AD, thus potentially conferring a higher vulnerability to the disease.

Indexed as

air pollutionAlzheimer's diseasebrain imaginggreennessnoisepreventionrisk factors

Identifiers

PMID34258378
PMCPMC8256622
OpenAlexW3179421218

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

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.