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The effects of ozone on immune function
G J Jakab1, E W Spannhake, B J Canning
1Department of Environmental Health Sciences, Johns Hopkins School of Hygiene and Public Health, Baltimore, MD 21205, USA.
Environmental Health Perspectives
|March 1, 1995
Summary
Ozone (O3) exposure impacts immune responses, initially suppressing them before adaptation occurs with continuous exposure. The timing of ozone exposure relative to immunization influences its suppressive effects on the immune system.
Area of Science:
- Environmental Health
- Immunology
- Toxicology
Background:
- Ozone (O3) exposure is known to modulate immune responsiveness, with studies reporting both suppressive and enhancing effects.
- The observed discrepancies in immune responses to O3 are attributed to variations in experimental design, immune parameters, and animal species studied.
Purpose of the Study:
- To review and synthesize existing literature on the effects of ozone exposure on immune responsiveness.
- To identify patterns and understand the temporal dynamics of immune system adaptation and response to ozone exposure.
Main Methods:
- Literature review of studies investigating ozone exposure and immune function.
- Analysis of experimental designs, immune parameters, and animal models across studies.
- Evaluation of the timing of ozone exposure in relation to antigenic stimulation.
Main Results:
- Continuous ozone exposure initially impairs immune responsiveness (days 0-3), followed by adaptation and re-establishment of immune function with prolonged exposure.
- Ozone exposure prior to immunization has no effect on the subsequent immune response to antigen.
- Ozone exposure after immunization significantly suppresses the immune response to the antigen.
Conclusions:
- Ozone exposure exhibits a biphasic effect on immune responsiveness, characterized by initial suppression and subsequent adaptation.
- The timing of ozone exposure is critical in determining its impact on immune responses, particularly in relation to antigenic challenges.
- Evidence suggests that ozone exposure can exert significant effects on systemic immunity, extending beyond the respiratory tract.