Abstract
Background
Colder temperature exposure is a known trigger for pediatric asthma exacerbation. The induction of oxidative stress is a known pathophysiologic pathway for asthma exacerbation. However, the role of oxidative stress in linking colder temperature exposure and worsened pediatric asthma symptoms is poorly understood.
Methods
In a panel study involving 43 children with asthma, aged 5–13 years old, each child was visited 4 times with a 2-week interval. At each visit, nasal fluid, urine, and saliva samples were obtained and measured for biomarkers of oxidative stress in the nasal cavity (nasal malondialdehyde [MDA]), the circulatory system (urinary MDA), and the oral cavity (salivary MDA). Childhood Asthma-Control Test (CACT) was used to assess asthma symptoms.
Results
When ambient daily-average temperature ranged from 7 to 18 °C, a 2 °C decrement in personal temperature exposures were significantly associated with higher nasal MDA and urinary MDA concentrations by 47–77% and 6–14%, respectively. We estimated that, of the decrease in child-reported CACT scores (indicating worsened asthma symptoms and asthma control) associated with colder temperature exposure, 14–57% were mediated by nasal MDA.
Conclusion
These results suggest a plausible pathway that colder temperature exposure worsens pediatric asthma symptoms partly via inducing nasal oxidative stress.
Impact
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The role of oxidative stress in linking colder temperature exposure and worsened asthma symptoms is still poorly understood.
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Lower temperature exposure in a colder season was associated with higher nasal and systemic oxidative stress in children with asthma.
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Nasal MDA, a biomarker of nasal oxidative stress, mediated the associations between colder temperature exposures and pediatric asthma symptoms.
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The results firstly suggest a plausible pathway that colder temperature exposure worsens pediatric asthma symptoms partly via inducing oxidative stress in the nasal cavity.
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Data availability
The datasets generated during and/or analyzed during the current study are not publicly available to preserve individuals’ privacy but are available from the corresponding author on reasonable request.
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Acknowledgements
We thank Xiaoxing Cui, Lin Fang, Yanbo Teng, Lili Lin, Xiaojian Zhou, Jianguo Hong, and Qian Wang for their valuable contributions to the collection of field data.
Funding
This study received funding from NSFC (No. 51521005 & 51420105010) and Underwriters Laboratories Inc.
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Drs. He and J. Zhang had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Substantial contributions to conception and design, acquisition of data, or analysis and interpretation of data: He, Norris, Barkjohn, Z. Li, F.Li, Y. Zhang, Black, Bergin, J. Zhang, Drafting the article or revising it critically for important intellectual content: He, Norris, Palaguachi-Lopez, Barkjohn, Bergin, and J. Zhang., Final approval of the version to be published: He, Norris, Palaguachi-Lopez, Barkjohn, Z. Li, F.Li, Y. Zhang, Black, Bergin, J. Zhang.
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He, L., Norris, C., Palaguachi-Lopez, K. et al. Nasal oxidative stress mediating the effects of colder temperature exposure on pediatric asthma symptoms. Pediatr Res (2024). https://doi.org/10.1038/s41390-024-03196-2
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DOI: https://doi.org/10.1038/s41390-024-03196-2