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Effects of ozone on the respiratory health, allergic sensitization, and cellular immune system in children
Insights
High ozone concentrations in children aged 10-14 years increased bronchial hyperresponsiveness. Environmental exposure did not affect lung function or allergic sensitization but altered lymphocyte subpopulations.
Area of Science:
- Environmental Health
- Pediatric Pulmonology
- Immunology
Background:
- Ozone is a major air pollutant with potential adverse effects on respiratory health.
- Understanding the long-term impacts of environmental ozone exposure on children is crucial for public health.
- Previous studies have indicated links between ozone and respiratory issues, but long-term effects require further investigation.
Purpose of the Study:
- To assess the lasting effects of high environmental ozone concentrations on children's respiratory health.
- To investigate the impact of ozone exposure on pulmonary function, bronchial hyperresponsiveness, allergic sensitization, and lymphocyte subpopulations.
Main Methods:
- A comparative study involving 10- to 14-year-old children from areas with high (Group A) and low (Group B) ozone concentrations.
- Assessment included respiratory health questionnaires, pulmonary function tests, methacholine bronchial challenge, skin prick tests for aeroallergens, and lymphocyte subpopulation analysis.
- 218 children were recruited from the high-ozone area, and 281 from the low-ozone area.
Main Results:
- No significant differences were observed in subjective respiratory complaints (cough, breathlessness, chest colds) or lung function parameters between the groups.
- Children exposed to high ozone concentrations (Group A) exhibited significantly more frequent and severe bronchial hyperresponsiveness to methacholine compared to Group B (29.4% vs. 19.9%).
- Allergic sensitization, total IgE levels, and white blood cell counts were similar; however, distinct changes were noted in lymphocyte subpopulations in Group A.
Conclusions:
- High environmental ozone concentrations are associated with increased bronchial hyperresponsiveness in children, even without significant changes in overall lung function or allergic status.
- Ozone exposure appears to induce specific alterations in lymphocyte subpopulations, suggesting an underlying immunomodulatory effect.
- Further research is warranted to elucidate the mechanisms behind ozone-induced bronchial hyperresponsiveness and lymphocyte changes in pediatric populations.
Abstract:
To investigate the lasting effects of high ozone concentrations under environmental conditions, we examined the respiratory health, pulmonary function, bronchial hyperresponsiveness to methacholine, allergic sensitization, and lymphocyte subpopulations of 10- to 14-yr-old children. A total of 218 children recruited from an area with high ozone concentrations (Group A) were tested against 281 children coming from an area with low ozone concentrations (Group B). As to subjective complaints, categorized as "usually cough with or without phlegm," "breathlessness," and "susceptibility to chest colds," there was no difference between the two groups. The lung function parameters were similar, but in Group A subjects' bronchial hyperresponsiveness occurred more frequently and was found to be more severe than in Group B (29.4 versus 19.9%, p less than 0.02; PD20 2,100 +/- 87 versus 2,350 +/- 58 micrograms, p less than 0.05). In both groups the number of children who had been suffering from allergic diseases and sensitization to aeroallergens, found by means of the skin test, was the same. Comparison of the total IgE levels showed no difference at all between the two groups. As far as the white blood cells are concerned, the total and differential cell count was the same, whereas lymphocyte subpopulations showed readily recognizable changes.(ABSTRACT TRUNCATED AT 250 WORDS)