title: Modulation of microRNA expression by volatile organic compounds in mouse lung.
abstract: Volatile organic compounds (VOCs) are one of main pollutants indoors. Exposure to VOCs is associated with cancer, asthma disease, and multiple chemical allergies. Despite the adverse health effects of VOCs, the molecular mechanisms underlying VOCs-induced disease remain largely unknown. MicroRNAs (miRNAs), as key post-transcriptional regulators of gene expression, may influence cellular disease state. To investigate whether lung miRNA expression profiles in mice are modified by VOCs mixture exposure, 44 male Kunming mice were exposed in 4 similar static chambers, 0 (control) and 3 different doses of VOCs mixture (groups 1-3). The concentrations of VOCs mixture were as follows: formaldehyde, benzene, toluene, and xylene 3.0 + 3.3 + 6.0 + 6.0 mg/m(3) , 5.0 + 5.5 + 10.0 + 10.0 mg/m(3) , 10.0 + 11.0 + 20.0 + 20.0 mg/m(3) , respectively, which corresponded to 30, 50, and 100 times of indoor air quality standard in China, after exposure to 2 weeks (2 h/day, 5 days/week). Small RNAs in lung and protein isolated from bronchoalveolar lavage fluid (BALF) were collected and analyzed for miRNA expression using microarray analysis and for interleukin-8 (IL-8) protein levels by enzyme-linked immunosorbent assay, respectively. VOCs exposure altered the miRNA expression profiles in lung in mice. Specifically, 69 miRNAs were significantly differentially expressed in VOCs-exposed samples versus controls. Functional annotation analysis of the predicted miRNA transcript targets revealed that VOCs exposure potentially alters signaling pathways associated with cancer, chemokine signaling, Wnt signaling, neuroactive ligand-receptor interaction, and cell adhesion molecules. IL-8 isolated from BALF and nitric oxide synthase of lung increased significantly, whereas GSH of lung decreased significantly in mice exposed to VOCs. These results indicate that inhalation of VOCs alters miRNA patterns that regulate gene expression, potentially leading to the initiation of cancer and inflammatory diseases.
authors.affiliation: School of Environmental Science and Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, Dalian 116024, China; Department of Biological Science, Luoyang Normal University, Luoyang 471022, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Wang
authors.forename: Chonglei
authors.initials: C
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Yihe
authors.initials: Y
authors.lastname: Jin
mesh_terms: D000393:Air Pollutants / Q000633:toxicity*; D000818:Animals; D001554:Benzene / Q000633:toxicity; D001992:Bronchoalveolar Lavage Fluid; D005557:Formaldehyde / Q000633:toxicity; D016209:Interleukin-8 / Q000378:metabolism; D008168:Lung / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D051379:Mice; D035683:MicroRNAs / Q000378:metabolism*; D014050:Toluene / Q000633:toxicity; D055549:Volatile Organic Compounds / Q000633:toxicity*; D014992:Xylenes / Q000633:toxicity
chemical_list: D000393:Air Pollutants; D016209:Interleukin-8; D035683:MicroRNAs; D055549:Volatile Organic Compounds; D014992:Xylenes; D005557:Formaldehyde; D014050:Toluene; D001554:Benzene
keywords: VOCs mixture; gene regulation; lung; miRNA; pathways