Asthma Clinical Trial
To examine air pollution, inflammation and new onset asthma in a large cohort of children in southern California.
BACKGROUND:
Ambient air pollution is well accepted as a cause of asthma exacerbations, but its role in
the etiology of new onset asthma is less clear. Evidence for an etiologic role of ambient
air pollutants is emerging from epidemiologic studies; however, the ecologic patterns of
increasing asthma prevalence concurrent with decreasing levels of some pollutants have
raised questions about the validity of these associations. A better understanding of the
biological processes that mediate the effects of ambient air pollution on asthma occurrence
is likely to contribute to answering these questions. Chronic oxidative/nitrosative stress
and airway inflammation are probably critical processes in asthma etiology and these
inter-related processes may mediate the increased asthma risk from air pollution.
This study builds on the existing Asthma Incidence Risk (AIR) study which is an ongoing
cohort study consisting of 6000 children with new onset asthma. The children live in 12
communities in Southern California. The communities were chosen to give a range of the key
ambient air pollutants of ozone, small particulates, NOx, acid vapors and tailpipe
emissions.
DESIGN NARRATIVE:
The study will use exhaled nitric oxide (eNO) to investigate the role of inflammation and
oxidative/nitrosative stress in the pathobiology of new onset asthma, with a focus on
ambient air pollution and genetic susceptibility. The investigators choose ambient
pollutants based on potential contribution to oxidative/nitrosative stress (O3; particulates
(PM10 and PM2.5 and their chemical constituents, particle counts, NOx (NO and NO2), acid
vapors; and fresh tailpipe emissions). The primary hypotheses to be assessed in the program
of research are: 1) children with high ambient air pollution exposures have chronic airway
inflammation as indicated by elevated eNO. 2) susceptibility to airway inflammation and
oxidative/nitrosative stress from ambient air pollution varies by NOS1, NOS2. NOS3. GSTM1.
GSTP1. NQO1, and HO-1 haplotypes and functional variants, and 3) children with chronic
airway inflammation as indicated by elevated eNO are at increased risk for new onset asthma.
To test these hypotheses, the study builds on the population resource of the Asthma
Incidence Risk (AIR) study, an ongoing prospective cohort study of the determinants of new
onset asthma in 6000 children in 13 southern California communities, and an extensive
program of ambient air pollution exposure characterization in these communities. The
investigators will measure eNO using off-line techniques and genotype 3000 children from the
AIR cohort. A number of resources will enhance the study, including the Children's
Environmental Health Center, the Molecular Biology Core of Southern California Environmental
Health Sciences Center, and expertise from the Southern California Particle Center and
Supersite.
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N/A
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