Differential effects of formaldehyde exposure on the cell influx and vascular permeability in a rat model of allergic lung inflammation

Autor(es)

Lino-dos-Santos-Franco, Adriana ^[1] ; Domingos, Helori Vanni ^[1] ; Ligeiro de Oliveira, Ana Paula ^[1] ; Breithaupt-Faloppa, Ana Cristina ^[1] ; Schatzmann Peron, Jean Pierre ^[2] ; Bolonheis, Simone ^[1] ; Muscara, Marcelo Nicolas ^[1] ; Oliveira-Filho, Ricardo Martins ^[1] ; Boris Vargaftig, B. ^[1] ; Tavares-de-Lima, Wothan ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Pharmacol, Inst Biomed Sci, BR-05508900 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Dept Immunol, Inst Biomed Sci, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Toxicology Letters; v. 197, n. 3, p. 211-218, SEP 1 2010.
• Citações Web of Science: 26

Resumo

Exposure to air pollutants such as formaldehyde (FA) leads to inflammation, oxidative stress and immune-modulation in the airways and is associated with airway inflammatory disorders such as asthma. The purpose of our study was to investigate the effects of exposure to FA on the allergic lung inflammation. The hypothesized link between reactive oxygen species and the effects of FA was also studied. To do so, male Wistar rats were exposed to FA inhalation (1%, 90 min daily) for 3 days. and subsequently sensitized with ovalbumin (OVA)-alum by subcutaneous route One week later the rats received another OVA-alum injection by the same route (booster). Two weeks later the rats were challenged with aerosolized OVA. The OVA challenge of rats upon FA exposure induced an elevated release of LTB(4). TXB(2), IL-1 beta, IL-6 and VEGF in lung cells, increased phagocytosis and lung vascular permeability, whereas the cell recruitment into lung was reduced. FA inhalation induced the oxidative burst and the nitration of proteins in the lung Vitamins C, E and apocynin reduced the levels of LTB(4) in BAL-cultured cells of the FA and FA/OVA groups, but Increased the cell influx into the lung of the FA/OVA rats. In OVA-challenged rats, the exposure to FA was associated to a reduced lung endothelial cells expression of intercellular cell adhesion molecule 1 (ICAM-1) In conclusion, our findings suggest that FA down regulate the cellular migration into the lungs after an allergic challenge and increase the ability of resident lung cells likely macrophages to generate inflammatory mediators, explaining the increased lung vascular permeability Our data are indicative that the actions of FA involve mechanisms related to endothelium-leukocyte interactions and oxidative stress, as far as the deleterious effects of this air pollutant on airways are concerned. (C) 2010 Elsevier Ireland Ltd. All rights reserved. (AU)

• Processo FAPESP: 08/50766-1 - Repercussao pulmonar e sistemica apos exposicao de ratos ao formaldeido: papel regulador das especies reativas derivadas do oxigenio e do nitrogenio.
• Beneficiário: Adriana Lino dos Santos Franco
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 07/55631-4 - Estudo da participação dos hormônios sexuais femininos na asma experimental induzida em linhagens de camundongos geneticamente selecionados (AIRmax e AIRmin)
• Beneficiário: Wothan Tavares de Lima
• Modalidade de apoio: Auxílio à Pesquisa - Regular