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Related Experiment Video

Updated: Jun 10, 2026

A Minimally Invasive Method for Intratracheal Instillation of Drugs in Neonatal Rodents to Treat Lung Disease
04:21

A Minimally Invasive Method for Intratracheal Instillation of Drugs in Neonatal Rodents to Treat Lung Disease

Published on: August 4, 2021

Small particles disrupt postnatal airway development.

DongYoub Lee1, Chris Wallis, Anthony S Wexler

  • 1Department of Mechanical and Aerospace Engineering, Univ. of California, Davis, CA 95616, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 17, 2010
PubMed
Summary
This summary is machine-generated.

Early life exposure to fine and ultrafine air pollution particles can alter lung development in young rats. Exposure to high-carbon ultrafine particles caused lasting changes in distal airway architecture.

Related Experiment Videos

Last Updated: Jun 10, 2026

A Minimally Invasive Method for Intratracheal Instillation of Drugs in Neonatal Rodents to Treat Lung Disease
04:21

A Minimally Invasive Method for Intratracheal Instillation of Drugs in Neonatal Rodents to Treat Lung Disease

Published on: August 4, 2021

Area of Science:

  • Environmental Health
  • Toxicology
  • Pulmonary Medicine

Background:

  • Epidemiologic studies link childhood air pollution exposure to impaired lung function development.
  • Combustion-generated fine and ultrafine particles are significant air pollutants.

Purpose of the Study:

  • To investigate the impact of varying sizes and compositions of combustion-generated particles on postnatal airway development in rats.
  • To assess effects on lung function, airway architecture, and cell proliferation.

Main Methods:

  • Neonatal Sprague-Dawley rats were exposed to particles (73, 212, 230 nm NMAD) with different elemental carbon (EC) and organic carbon (OC) content from postnatal day 7-25.
  • Lung function and airway architecture were assessed at 81 days of age.
  • Cell proliferation was examined after a single exposure at 7 days of age.

Main Results:

  • Exposure to 73 nm high OC/EC particles altered distal airway architecture and caused subtle lung mechanics changes.
  • Exposure to 212 nm high OC/EC particles did not affect lung architecture but altered lung mechanics, suggesting central airway changes.
  • Exposure to 230 nm low OC/EC particles had no impact on lung architecture or mechanics.
  • A single exposure to 73 nm high OC/EC particles decreased airway cell proliferation, while 212 nm high OC/EC particles increased it.

Conclusions:

  • Early-life exposure to ultrafine, high OC/EC particles leads to persistent alterations in distal airway architecture.
  • These persistent changes are characterized by an initial decrease in airway cell proliferation.