Evidence map›Paper›PMID 21864400›Full record

ArticleJournal of neuroinflammation2011

Air pollution & the brain: Subchronic diesel exhaust exposure causes neuroinflammation and elevates early markers of neurodegenerative disease.

Shannon Levesque, Michael J Surace, Jacob McDonald, Michelle L Block

Open access · goldAbstract read
In one paragraph

Article in Journal of neuroinflammation, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 162 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
162citing papers in PubMed, 4 pooled it
9.0field-weighted citation impact, top 1% 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

162 citing papers in PubMed, 4 syntheses or guidelines pooled it, 335 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Air Pollution and Dementia: A Systematic Review.Journal of Alzheimer's disease : JAD · 2019
    Pooled it
  4. Pooled it
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Review
  11. Article
  12. Article
  13. Review
  14. Article
  15. Review
  16. Article
  17. Review
  18. Review
  19. Factors associated with age at tau pathology onset and time from tau onset to dementia in Alzheimer's disease.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2025
    Article
  20. Article

102 more citing papers are in PubMed but not listed here.

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

4 authors at 2 institutions in 1 country.

Shannon LevesqueDepartment of Anatomy and Neurobiology, Virginia Commonwealth University Medical Campus, Richmond, VA 23298, USA.
Michael J Surace
Jacob McDonald
Michelle L Block
Virginia Commonwealth University Medical Center · USLovelace Respiratory Research Institute · US

Funding

SERTOLI CELL TOXICANT INJURY AND MECHANISMS OF TESTICULAR GERM CELL APOPTOSISR01ES016591 · NIEHS · UNIVERSITY OF TEXAS AT AUSTIN · PI RICHBURG, JOHN H · 2009 to 2024
$5.9M
Protein radicals in microglia: environmental mechanisms of chronic neurotoxicityR01ES016951 · NIEHS · VIRGINIA COMMONWEALTH UNIVERSITY · PI BLOCK, MICHELLE L · 2009 to 2013
$2.1M
NIEHS NIH HHS R01ES016591NIEHS NIH HHS R01 ES016951
6 · The paper itself

Abstract

backgroundIncreasing evidence links diverse forms of air pollution to neuroinflammation and neuropathology in both human and animal models, but the effects of long-term exposures are poorly understood.

objectiveWe explored the central nervous system consequences of subchronic exposure to diesel exhaust (DE) and addressed the minimum levels necessary to elicit neuroinflammation and markers of early neuropathology.

methodsMale Fischer 344 rats were exposed to DE (992, 311, 100, 35 and 0 μg PM/m³) by inhalation over 6 months.

resultsDE exposure resulted in elevated levels of TNFα at high concentrations in all regions tested, with the exception of the cerebellum. The midbrain region was the most sensitive, where exposures as low as 100 μg PM/m³ significantly increased brain TNFα levels. However, this sensitivity to DE was not conferred to all markers of neuroinflammation, as the midbrain showed no increase in IL-6 expression at any concentration tested, an increase in IL-1β at only high concentrations, and a decrease in MIP-1α expression, supporting that compensatory mechanisms may occur with subchronic exposure. Aβ42 levels were the highest in the frontal lobe of mice exposed to 992 μg PM/m³ and tau [pS199] levels were elevated at the higher DE concentrations (992 and 311 μg PM/m³) in both the temporal lobe and frontal lobe, indicating that proteins linked to preclinical Alzheimer's disease were affected. α Synuclein levels were elevated in the midbrain in response to the 992 μg PM/m³ exposure, supporting that air pollution may be associated with early Parkinson's disease-like pathology.

conclusionsTogether, the data support that the midbrain may be more sensitive to the neuroinflammatory effects of subchronic air pollution exposure. However, the DE-induced elevation of proteins associated with neurodegenerative diseases was limited to only the higher exposures, suggesting that air pollution-induced neuroinflammation may precede preclinical markers of neurodegenerative disease in the midbrain.

Indexed as

Air PollutionBrainEncephalitisNeurodegenerative DiseasesAir Pollutantsalpha-SynucleinAnimalsBiomarkersChemokinesCytokinesHumansInhalation ExposureMaleRatsRats, Inbred F344tau ProteinsAir Pollutantsalpha-SynucleinBiomarkersChemokinesCytokinesMapt protein, rattau ProteinsVehicle Emissions

Identifiers

PMID21864400
PMCPMC3184279
OpenAlexW2127435517

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.