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Pulmonary hazards of nanoplastic particles: a study using polystyrene in in vitro models of the alveolar and bronchial epithelium
Summary
Lab tests on human lung cell models found that polystyrene nanoplastics did not cause immediate cell death but did interfere with key lung functions like surfactant and mucus production and immune signaling. This means standard toxicity tests may underestimate the real danger of inhaling nanoplastics, and researchers need to look beyond simple cell survival to understand the true health effects on the lungs.
Our results show that PS-Eu exposure does not induce acute cytotoxicity in these models, but affects cell-specific functions like surfactant, mucin, and cytokine production. This underscores the limitations of relying solely on standard cytotoxicity tests for particle hazard assessment and highlights the importance of investigating cell function-specific signaling pathways. To support researchers in hazard assessment, we propose specific classes of biomarkers to test in in vitro lung models.