Role of Paris PM2.5 components in the pro-inflammatory response induced in airway epithelial cells

• Published in: Toxicology (Amsterdam) Vol. 261; no. 3; pp. 126 - 135
• Main Authors: Baulig, Augustin, Singh, Seema, Marchand, Alexandre, Schins, Roel, Barouki, Robert, Garlatti, Michèle, Marano, Francelyne, Baeza-Squiban, Armelle
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier 10.07.2009
• Subjects: Biological and medical sciences; Chemical and industrial products toxicology. Toxic occupational diseases; Emergency; Medical sciences; Metals and various inorganic compounds; Toxicology; France; Europe; Paris; Ile-de-France; Reactive oxygen species; PM 2.5; EPR; Metals; 16-HBE; 16-HBE14o- cell line; particulate matter with an aerodynamic diameter <2.5 μm; granulocyte macrophage-colony stimulating factor; polycyclic aromatic hydrocarbons; DEP; electron paramagnetic resonance; diesel exhaust particles; GM-CSF; carbon black particles; PAH; Polyaromatic hydrocarbons; Pro-inflammatory cytokines; CB; Oxidative stress; Diesel exhaust particles; Cytokine; Diesel engine; Inflammation; Metal; Polycyclic aromatic compound; Respiratory system; In vitro; Respiratory tract; Fine particle; Epithelial cell; Exhaust gas; PM
• ISSN: 0300-483X; 1879-3185
• DOI: 10.1016/j.tox.2009.05.007

Abstract Particulate matter (PM) is suspected to play a role in environmentally-induced pathologies. Due to its complex composition, the contribution of each PM components to PM-induced biological effects remains unclear. Four samples of Paris PM2.5 having different polyaromatic hydrocarbons and metals contents were compared with each other and with their respective aqueous and organic extracts used alone or in combination. The four PM2.5 samples similarly induced granulocyte macrophage-colony stimulating factor (GM-CSF) release, a pro-inflammatory cytokine, by human bronchial epithelial cells. It results from the activation of upstream signalling pathways and the modulation of the cellular redox state that is different according to PM2.5 samples. The PM-aqueous extracts contained soluble metals involved in hydroxyl radical production in abiotic conditions. However they slightly contributed to the intracellular reactive oxygen species production and GM-CSF release by comparison with organic extracts. Organic compounds transactivated the xenobiotic responsive element (XRE) and antioxidant responsive element (ARE), leading to increased cytochrome P450 1A1 expression and NADPH-quinone oxydoreductase-1 expression respectively but to different extend according to PM samples underlying differences in their bioavailability. Our study underlines that chemical composition of particles per se is insufficient to predict cellular effects and that the interaction and the bioavailability of the various components were critical.