期刊
JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE
卷 7, 期 6, 页码 1815-+出版社
ELSEVIER
DOI: 10.1016/j.jaip.2019.01.051
关键词
Vitamin D; Asthma; Particulate matter; Obesity
资金
- US Environmental Protection Agency [RD-83615201, RD-83451001, RD83213901]
- National Institutes of Health [F32 PA-09-210, 1P50ES015903, P01ES018176, P50ES018176, 4KL2TR001077-04, 1P50ES015903-01]
BACKGROUND: Indoor fine particulate air pollution (PM2.5) is linked to asthma morbidity; however, whether vitamin D status influences individual susceptibility to airborne exposures is unclear. OBJECTIVE: We aimed to determine if vitamin D modifies the effects of indoor PM2.5 on asthma symptoms in urban children. METHODS: A total of 120 children aged 5 to 12 years with physician-diagnosed asthma were evaluated at baseline and every 3 months for 9 months. Indoor PM2.5, serum 25-hydroxy vitamin D (25-OH D) levels, and asthma symptoms were simultaneously assessed at each time point. Adjusting for confounders, generalized estimating equations assessed the 3-way interaction effects of 25-OH D, obesity, and PM on asthma symptoms. RESULTS: Children were of mean (standard deviation [SD]) age 9.7 (2.2) years, 36% were obese, and 95% self-reported black race. Mean (SD) PM2.5 indoor exposure was 38.2 (42.9) mu g/m(3) and 25-OH D was 19.1 (7.5) ng/mL. Three-way interaction models demonstrated significantly greater PM2.5-associated effects on daytime asthma symptoms only among obese children with low 25-OH D levels (odds ratio [OR](PM2.5 )= 1.26, P = .049 at vitamin D = 15.5 ng/mL, increasingly stronger PM effects at levels <15.5 ng/mL). In homes with increased PM2.5, higher 25-OH D was associated with decreased symptom odds (eg, ORVitamin D = 0.87; P = .049 at PM2.5 = 52.5 mu g/m(3) increasingly protective effects >52.5 mu g/m(3)) among obese children. CONCLUSIONS: Among obese urban children with asthma, low individual 25-OH D enhanced adverse respiratory effects associated with indoor PM2.5. In high PM2.5 environments, 25-OH D was protective against asthma symptoms. Optimizing vitamin D status in children may help reduce asthma morbidity driven by indoor air pollution. (C) 2019 American Academy of Allergy, Asthma & Immunology
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