Increased production of hydrogen peroxide by peripheral blood monocytes associated with smoking exposure intensity in smokers

Autor(es)

Tanni, Suzana E. ^{[1, 2]} ; Correa, Camila R. ^[3] ; Angeleli, Aparecida Y. ^[2] ; Vale, Simone A. ^[2] ; Coelho, Liana S. ^[2] ; Godoy, Irma ^[2]

Afiliação do(s) autor(es)

^[1] UNESP, Fac Med Botucatu, Dept Clin Med, BR-18618970 Botucatu, SP - Brazil

^[2] Univ Estadual Paulista, UNESP, Disciplina Pneumol, Fac Med Botucatu, Sao Paulo - Brazil

^[3] Univ Estadual Paulista, UNESP, Dept Patol, Fac Med Botucatu, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Inflammation-London; v. 9, NOV 21 2012.
• Citações Web of Science: 4

Resumo

Background: Smoking is known to be associated with oxidative stress; however, it has not been elucidated whether the oxidative response is influenced by the intensity of smoking exposure. Objectives: Evaluate the effect of smoking exposure on the secretion of hydrogen peroxide (H2O2) by the peripheral blood monocytes of smokers. Methods: A total of 25 smokers (50.3 +/- 8.8 years, 48% male) underwent the following evaluations: spirometry, pulse oximetry, body composition and total peripheral blood count. Peripheral blood monocyte (PBM) cultures were isolated and maintained, and IL-6 and TNF-alpha were measured in the plasma and in the supernatants of spontaneous and stimulated cultures. H2O2 was evaluated in the supernatants of the PBM cultures, and a subset of the PBM culture supernatants was stimulated with phorbol myristate acetate (PMA). We also evaluated 38 healthy controls (49.1 +/- 8.2 years, 42% male). Results: The spontaneous and stimulated monocytes' secretion of H2O2 were statistically higher in the smokers than in the healthy controls (p<0.001). The H2O2 secretions were statistically significant higher after stimulation with PMA in both groups (p<0.001). In the multiple regression analysis, we identified a positive, statistically significant association between pack-years of smoking and the spontaneous secretion of H2O2 by PBM culture, adjusted for potential confounding variables. The association between PBM culture secretion of H2O2 and the production of TNF-alpha and IL-6 was not significant. Conclusion: We identified a positive association between higher production of H2O2 in smokers and higher smoking exposure during life. The influence of pack-years smoking may be a key modifiable factor in oxidative stress associated to smoking. (AU)

• Processo FAPESP: 03/05285-1 - Padronização do perfil normal de citocinas em fumantes e não fumantes: efeito do sexo e do envelhecimento
• Beneficiário: Aparecida Yooko Outa Angeleli
• Modalidade de apoio: Auxílio à Pesquisa - Regular