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ASTHMA |
1 Instituto Nacional de Salud Publica de México, Cuernavaca, Mexico
2 Hospital Infantil "Federico Gómez", México
3 National Institute of Environmental Health (NIEHS), NC, USA
Correspondence to:
Correspondence to:
Dr I Romieu
Instituto Nacional de Salud Publica, 655 Avenida Universidad, Col. Santa Maria Ahuacatitlán, 62508 Cuernavaca, Morelos, México; iromieu{at}correo.insp.mx
Background: We recently reported that antioxidant supplementation with vitamins C and E mitigated ozone related decline in forced expiratory flow (FEF25–75) in 158 asthmatic children in an area with high ozone exposure in Mexico City.
Methods: A study was undertaken to determine whether deletion of glutathione S-transferase M1 (GSTM1 null genotype), a gene involved in response to oxidative stress, influences ozone related decline in FEF25–75 and the benefit of antioxidant supplementation.
Results: GSTM1 null children receiving placebo had significant ozone related decrements in FEF25–75 (percentage change per 50 ppb of ozone 2.9 (95% CI -5.2 to -0.6), p = 0.01); GSTM1 positive children did not. Conversely, the effect of antioxidants was stronger in children with the GSTM1 null genotype.
Conclusions: Asthmatic children with a genetic deficiency of GSTM1 may be more susceptible to the deleterious effects of ozone on the small airways and might derive greater benefit from antioxidant supplementation.
Keywords: GSTM1; asthma; antioxidant; diet; children; genetics
Relevant Article
Thorax 2004 59: 1.
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