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Related Experiment Videos

Ozone-induced inflammation is attenuated with multiday exposure

D L Christian1, L L Chen, C H Scannell

  • 1The Lung Biology Center, Center for Occupational and Environmental Health, and Medical Service, San Francisco General Hospital, University of California, San Francisco, California, USA.

American Journal of Respiratory and Critical Care Medicine
|August 12, 1998
PubMed
Summary

Repeated ozone exposure in humans initially worsened lung inflammation but then decreased it. This suggests the body adapts, reducing the inflammatory response over several days.

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Area of Science:

  • Environmental Health
  • Pulmonary Medicine
  • Toxicology

Background:

  • Ozone (O3) is known to cause acute lung inflammation.
  • The effects of repeated short-term ozone exposure on human inflammatory responses are not well understood.

Purpose of the Study:

  • To test if repeated daily exposures to high-ambient ozone concentrations cause more inflammation than a single exposure.
  • To investigate the progression of ozone-induced lung inflammation in healthy humans.

Main Methods:

  • Fifteen healthy volunteers were exposed to 0.2 ppm ozone for 4 hours daily for up to 4 consecutive days.
  • Pulmonary function tests were conducted before and after exposures.
  • Bronchoscopy with bronchoalveolar lavage (BAL) was performed 20 hours post-exposure to analyze inflammatory markers.

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Main Results:

  • Physiological responses (FEV1, FVC, SRaw) showed initial progression followed by attenuation with repeated exposures.
  • Inflammatory markers in bronchial lavage fluid, including polymorphonuclear cells (PMNs) and IL-6, significantly decreased after 4 days of exposure compared to a single day.
  • Decreased fibronectin and PMNs were observed in both bronchial fraction and BAL after repeated exposures.

Conclusions:

  • Repeated daily exposure to ozone leads to an attenuation of the inflammatory response in both proximal airways and the distal lung.
  • The human respiratory system may develop tolerance to ozone after repeated short-term exposures.
  • Findings suggest a complex adaptive response to environmental pollutants like ozone.