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Current Environmental Health Reports

, Volume 4, Issue 2, pp 166–179 | Cite as

Outdoor Ambient Air Pollution and Neurodegenerative Diseases: the Neuroinflammation Hypothesis

  • Richard L. Jayaraj
  • Eric A. Rodriguez
  • Yi Wang
  • Michelle L. Block
Mechanisms of Toxicity (JR Richardson, Section Editor)
Part of the following topical collections:
  1. Topical Collection on Mechanisms of Toxicity

Abstract

Purpose of Review

Accumulating research indicates that ambient outdoor air pollution impacts the brain and may affect neurodegenerative diseases, yet the potential underlying mechanisms are poorly understood.

Recent Findings

The neuroinflammation hypothesis holds that elevation of cytokines and reactive oxygen species in the brain mediates the deleterious effects of urban air pollution on the central nervous system (CNS). Studies in human and animal research document that neuroinflammation occurs in response to several inhaled pollutants. Microglia are a prominent source of cytokines and reactive oxygen species in the brain, implicated in the progressive neuron damage in diverse neurodegenerative diseases, and activated by inhaled components of urban air pollution through both direct and indirect pathways. The MAC1-NOX2 pathway has been identified as a mechanism through which microglia respond to different forms of air pollution, suggesting a potential common deleterious pathway.

Summary

Multiple direct and indirect pathways in response to air pollution exposure likely interact in concert to exert CNS effects.

Keywords

Microglia Neuroinflammation Air pollution Neurodegenerative disease 

Notes

Acknowledgments

This work was supported by the National Institute of Environmental Health Sciences/the National Institute of Health [Grant number 1R01ES016951].

Compliance with Ethical Standards

Conflict of Interest

Richard L. Jayaraj, Eric A. Rodriguez, Yi Wang, and Michelle L. Block declare that they have no conflict of interest.

Human and Animal Rights and Informed Consent

This article does not contain any studies with human or animal subjects performed by any of the authors.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Richard L. Jayaraj
    • 1
  • Eric A. Rodriguez
    • 1
  • Yi Wang
    • 2
  • Michelle L. Block
    • 1
  1. 1.Department of Anatomy and Cell Biology, The Stark Neuroscience Research InstituteIndiana University School of MedicineIndianapolisUSA
  2. 2.Department of Environmental Health, Indiana University Richard M. Fairbanks School of Public HealthIndiana UniversityIndianapolisUSA

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