Published ahead of print on September 11, 2003, doi:10.1164/rccm.200305-684OC
American Journal of Respiratory and Critical Care Medicine Vol 168. pp. 1199-1204, (2003)
© 2003 American Thoracic Society
Nicotinamide Adenine Dinucleotide (Phosphate) Reduced:Quinone Oxidoreductase and Glutathione S-Transferase M1 Polymorphisms and Childhood Asthma
Gloria L. David,
Isabelle Romieu,
Juan Jose Sienra-Monge,
William J. Collins,
Matiana Ramirez-Aguilar,
Blanca Estela del Rio-Navarro,
Norma Isabel Reyes-Ruiz,
Richard W. Morris,
Jacqueline M. Marzec and
Stephanie J. London
Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina; National Institute of Public Health, Cuernavaca; and Hospital Infantil de Mexico Frederico Gomez, Mexico City, Mexico
Correspondence and requests for reprints should be addressed to Gloria David, Ph.D., National Institute of Environmental Health Sciences, PO Box 12233, MD D2-01, Research Triangle Park, NC 27709. E-mail: davidbe1{at}niehs.nih.gov
Nicotinamide adenine dinucleotide (phosphate) reduced:quinone oxidoreductase (NQO1) and glutathione S-transferase (GST) M1 are phase II enzymes important in response to oxidative stress, such as occurs during exposure to ozone. We examined the relationship between functionally significant polymorphisms in NQO1 (Pro187Ser) and GSTM1 (homozygous deletion) and asthma risk in children with high lifetime exposure to ozone. We enrolled children with asthma from the allergy referral clinic at a public pediatric hospital in Mexico City, together with their parents. We assayed for the Pro187Ser polymorphism in NQO1 using a polymerase chain reactionrestriction fragment length polymorphism assay and for the presence of GSTM1 by polymerase chain reaction among 218 caseparent triads. We did not find strong evidence of an association between NQO1 genotype alone and asthma risk. However, among subjects with homozygous deletion of GSTM1, carriers of a serine allele were at significantly reduced risk of asthma compared with Pro/Pro homozygotes (relative risk = 0.4; 95% confidence interval, 0.20.8). The p value for difference in relative risk for NQO1 by GSTM1 genotype = 0.013. These data are consistent with a protective effect of the NQO1 Ser allele in this population of GSTM1-null children with high ozone exposure.
Key Words: caseparent triad oxidative stress environmental tobacco smoke GSTM1 NQO1
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