Polyethylene Micro/Nanoplastics Exposure Induces Epithelial-Mesenchymal Transition in Human Bronchial and Alveolar Epithelial Cells

• Published in: International journal of molecular sciences 2024-09, Vol.25 (18), p.10168
• Main Authors: Traversa, Alice, Mari, Emanuela, Pontecorvi, Paola, Gerini, Giulia, Romano, Enrico, Megiorni, Francesca, Amedei, Amedeo, Marchese, Cinzia, Ranieri, Danilo, Ceccarelli, Simona
• Format: Article
• Language: English
• Subjects: alveolar; Alveolar Epithelial Cells - drug effects; Alveolar Epithelial Cells - metabolism; Alveolar Epithelial Cells - pathology; Bronchi; Bronchi - cytology; Bronchi - drug effects; Bronchi - metabolism; bronchial; Cell cycle; Cell Movement - drug effects; Cell Survival - drug effects; Cytoskeleton; Development and progression; EMT; Environmental aspects; Epithelial cells; Epithelial-Mesenchymal Transition - drug effects; Gene expression; Health aspects; Humans; Hypotheses; Lung diseases; Lungs; Microplastics - toxicity; MNPs; Morphology; Nanoparticles; Physiological aspects; Plastic pollution; Polyethylene; Polyethylene - toxicity; Pulmonary alveoli; Risk factors; Transcription factors
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms251810168

Micro/nanoplastics (MNPs), which are widely spread in the environment, have gained attention because of their ability to enter the human body mainly through ingestion, inhalation, and skin contact, thus representing a serious health threat. Several studies have reported the presence of MNPs in lung tissue and the potential role of MNP inhalation in triggering lung fibrosis and tumorigenesis. However, there is a paucity of knowledge regarding the cellular response to MNPs composed of polyethylene (PE), one of the most common plastic pollutants in the biosphere. In this study, we investigated the effects of low/high concentrations of PE MNPs on respiratory epithelial cell viability and migration/invasion abilities, using MTT, scratch, and transwell assays. Morphological and molecular changes were assessed via immunofluorescence, Western blot, and qRT-PCR. We demonstrated that acute exposure to PE MNPs does not induce cellular toxicity. Instead, cells displayed visible morphological changes also involving actin cytoskeleton reorganization. Our data underlined the role of epithelial-mesenchymal transition (EMT) in triggering this process. Moreover, a remarkable increase in migration potential was noticed, in absence of a significant alteration of the cell's invasive capacity. The present study highlights the potential impact of PE MNPs inhalation on the human respiratory epithelium, suggesting a possible role in carcinogenesis.