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Related Experiment Video

Updated: Jun 13, 2026

Microglia as a Surrogate Biosensor to Determine Nanoparticle Neurotoxicity
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Microglia as a Surrogate Biosensor to Determine Nanoparticle Neurotoxicity

Published on: October 25, 2016

Silica-based nanoparticle uptake and cellular response by primary microglia.

Judy Choi1, Qingdong Zheng, Howard E Katz

  • 1Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205, USA.

Environmental Health Perspectives
|May 5, 2010
PubMed
Summary

Silica nanoparticles (SiNPs) alter key microglial functions in the central nervous system (CNS). Even at low doses, SiNPs increase reactive oxygen and nitrogen species, impacting brain cells.

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Area of Science:

  • Neuroscience
  • Nanotechnology
  • Immunology

Background:

  • Silica nanoparticles (SiNPs) are explored for central nervous system (CNS) applications like imaging and gene delivery.
  • Microglia, the CNS resident macrophages, are primary responders to foreign substances like SiNPs.
  • Understanding SiNP effects on microglia is crucial due to their potential for morphological and functional changes.

Purpose of the Study:

  • To investigate the in vitro effects of silica nanoparticles (SiNPs) on primary rat microglia.
  • To assess SiNP uptake, cytotoxicity, and functional responses in microglia.

Main Methods:

  • Microglial uptake of SiNPs was visualized using transmission electron and fluorescence confocal microscopy.
  • Microglial functions including phagocytosis, reactive oxygen species (ROS) and reactive nitrogen species (RNS) production, proinflammatory gene expression, and cytokine release were measured.

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  • SiNP exposure was conducted at various concentrations.

    • Main Results:

    • Primary microglia avidly internalized SiNPs across all tested concentrations without exhibiting cytotoxicity or altered phagocytosis.
    • SiNP exposure led to increased intracellular ROS and RNS production.
    • A significant decrease in tumor necrosis factor-alpha and an increase in COX-2 gene expression were observed, alongside detectable interleukin-1beta release.

    Conclusions:

    • This study provides the first in vitro evidence of SiNP effects on primary microglia.
    • Low levels of SiNPs can modulate microglial function, including increased ROS/RNS production and altered gene expression.
    • These SiNP-induced changes in microglia may negatively impact neuronal function within the CNS.