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Related Experiment Video

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Author Spotlight: Exploring Microglial Interactions with Stress-Response Circuitry Using the Limited Bedding and Nesting Model

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Bedding-generated particulate matter: implications for rodent studies.

Neelakshi Hudda¹, John L Durant^1,2, Alexandra Nemeth³

¹Department of Civil and Environmental Engineering, Tufts University, Medford, MA, USA.

Inhalation Toxicology

|November 26, 2019

Summary

Rodent bedding releases significant particulate matter (PM2.5) when disturbed, posing a risk to research animals. Filter tops exacerbate PM2.5 exposure, highlighting environmental concerns in laboratory animal housing.

Keywords:

PM2.5 Particulate matter (PM)bar lids bedding material cage ventilation endotoxin filter top isolator microenvironment rodent bedding rodent cages

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Area of Science:

Laboratory animal science
Environmental health
Toxicology

Background:

Rodents in research often use natural bedding materials.
Inhaled particulate matter (PM) is known to cause biological harm.
Limited research exists on PM exposure from bedding in rodent cages.

Purpose of the Study:

To quantify bedding-generated PM concentrations in rodent cages.
To identify factors influencing PM accumulation and reduction within cages.

Main Methods:

Measured PM2.5 levels in cages with pine, aspen, paper, and corncob bedding.
Assessed PM2.5 with and without filter top isolators.
Monitored PM2.5 during simulated rodent activity and with rats present.

Main Results:

All bedding types generated significant PM2.5 increases (50-100 fold) upon disturbance.
Cages with filter tops showed 10x higher PM2.5 concentrations than those without.
Elevated PM2.5 levels persisted longer (5-10 min) in filter-top cages.

Conclusions:

Standard laboratory housing exposes rodents to substantial PM2.5.
Bedding-generated PM is a critical environmental factor in rodent studies.