title: Sequential air-liquid exposure of human respiratory cells to chemical and biological pollutants.
abstract: Although indoor air has wide ranging effects on human health, the effects of environmental, chemical, and biological pollutants on the respiratory system are not fully understood. In order to clarify the health effects of airborne pollutant exposure, it would appear that toxicological evidence is needed to complement epidemiological observations to support by providing biological plausibility. The aim of this study is to manage air-liquid successive exposures to different pollutants such as a chemical pollutant (formaldehyde--FA), and a biological contaminant (Aspergillus fumigatus--Asp) using our in vitro model. Human alveolar cells (A549) were exposed at the air-liquid interface in an exposure module, firstly to an environmental level of FA (50 μg/m³) (or air) for 30 min, and 14 h later to Asp (7×10⁸ spores/m³) (or air) for 30 min. After 10 h post-incubation, cellular viability was assessed. Inflammation biomarkers (IL-8, MCP-1) were assayed by ELISA and by RT-PCR. Whatever the conditions, no cytotoxic effect was observed. FA followed by air exposure did not induce modification of production and expression of cytokines, confirming results with a unique FA exposure. Air followed by Asp exposure tended to induce IL-8 expression whereas IL-8 production tended to increase after FA and Asp exposure compared to FA and air exposure. The reaction of cells to sequential exposure to FA and Asp was moderate. These results show the feasibility of our model for sequential exposures to different types of environmental pollutants, allowing using it for preliminary assessment of cellular activity modification induced by airborne contaminants.
authors.affiliation: Laboratoire de Santé Publique et Environnement-EA 4064, Université Paris Descartes, Paris, France.
authors.forename: Charles
authors.initials: C
authors.lastname: Persoz
authors.forename: Christopher
authors.initials: C
authors.lastname: Leleu
authors.forename: Sophie
authors.initials: S
authors.lastname: Achard
authors.forename: Magali
authors.initials: M
authors.lastname: Fasseu
authors.forename: Jean
authors.initials: J
authors.lastname: Menotti
authors.forename: Pascale
authors.initials: P
authors.lastname: Meneceur
authors.forename: Isabelle
authors.initials: I
authors.lastname: Momas
authors.forename: Francis
authors.initials: F
authors.lastname: Derouin
authors.forename: Nathalie
authors.initials: N
authors.lastname: Seta
mesh_terms: D000393:Air Pollutants / Q000633:toxicity*; D001232:Aspergillus fumigatus / Q000378:metabolism; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D018932:Chemokine CCL2 / Q000096:biosynthesis / Q000235:genetics; D005557:Formaldehyde / Q000633:toxicity*; D006801:Humans; D019570:Inhalation Exposure / Q000009:adverse effects*; D016209:Interleukin-8 / Q000096:biosynthesis / Q000235:genetics; D008168:Lung / Q000166:cytology / Q000187:drug effects* / Q000382:microbiology; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D018709:Statistics, Nonparametric
chemical_list: D000393:Air Pollutants; C111835:CCL2 protein, human; D018932:Chemokine CCL2; D016209:Interleukin-8; D012333:RNA, Messenger; D005557:Formaldehyde