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Updated: Jul 31, 2025

Microglia as a Surrogate Biosensor to Determine Nanoparticle Neurotoxicity

Microglia as a Surrogate Biosensor to Determine Nanoparticle Neurotoxicity

Published on: October 25, 2016

Air pollution nanoparticle and alpha-synuclein fibrils synergistically decrease glutamate receptor A1, depending upon

Hongqiao Zhang¹, Carla D'Agostino¹, Christopher Tulisiak²

¹Leonard Davis School of Gerontology, University of Southern California, USA.

|May 2, 2023

Summary

This summary is machine-generated.

Air pollution exposure showed weak effects on alpha-synuclein propagation in mice. However, nano-particulate matter and alpha-synuclein synergistically reduced glutamate receptor A1 (Gria1) expression in the brain.

Keywords:

Air pollution Glutamate receptor A1 Iba1 Nanoparticles Parkinson’s disease α-synuclein

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Published on: June 26, 2018

Area of Science:

Neuroscience
Environmental Health
Toxicology

Background:

Epidemiological studies suggest a link between air pollution and Parkinson's disease (PD) risk.
Alpha-synuclein (α-syn) propagation is central to PD pathogenesis.
Glutamate receptor A1 (GluA1) is implicated in memory and olfaction.

Purpose of the Study:

To investigate the experimental link between nano-particulate matter (nPM) exposure and α-synuclein propagation in a mouse model.
To assess the impact of nPM and α-synuclein fibrils (PFFs) on Gria1 expression and neuroinflammation.

Main Methods:

Mice were exposed to different batches of nPM and injected with α-synuclein pre-formed fibrils (PFFs).
Two exposure paradigms were used, varying the timing of PFF injection relative to nPM exposure.
α-syn pSer129, microglia Iba1, inflammatory cytokines, and Gria1 expression were measured.

Main Results:

nPM exposure showed a trend towards elevated α-syn pSer129 in one paradigm but no significant effect in another.
The combination of nPM and PFFs significantly decreased Gria1 mRNA in the olfactory bulb (OB) and frontal cortex.
Neither nPM nor PFFs alone induced significant microglial activation or altered Gria1 expression.

Conclusions:

Ambient nano-particulate matter (nPM) had minimal impact on α-synuclein propagation in the brain under the tested conditions.
nPM and α-synuclein synergistically downregulated Gria1 expression in the OB and cortex, suggesting a potential mechanism for neurotoxicity.