Genetic Susceptibility to Ozone in Mild Asthmatic Volunteers
Status:
Completed
Trial end date:
2015-11-01
Target enrollment:
Participant gender:
Summary
Recent reports have shown that people with asthma who have a particular gene, known as the
GSTM1 null gene, are more susceptible to the effect of air pollutants. The purpose of this
research study is to learn if volunteers who have asthma and have a GSTM1 null gene have
increased response (change in lung function and increase in lung cells collected from sputum)
compared to volunteers with asthma who have the GSTM1 sufficient gene when challenged with
0.4 ppm ozone during intermittent exercise. The principal purpose of this study is to
identify hyper-responsive, responsive and non-responsive groups of human subjects with mild
asthma based on their airway neutrophilic response to ozone exposure, and to perform analyses
on DNA from airway cells to explore possible differences in genetic profiles between the
three groups. An additional pilot aim is to compare expression of a small number of specific
genes of interest in a subset of ozone-responsive and ozone-non-responsive subjects with mild
asthma.