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Short-Term Cellular Responses to Sub-100 nm PMMA and Polystyrene-Based Copolymer Nanoplastics in Human Embryonic Lung Fibroblasts: Cytotoxicity and Redox-Associated Markers
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Scientists exposed human lung cells to tiny plastic particles, the kind you might inhale from air pollution, and found that different plastic types affected cell stress and damage responses differently, with one formulation causing harm at much lower amounts than others. This early lab study suggests not all nanoplastics are equally risky, but more research is needed before we understand real-world health effects.
Airborne plastic particles are a potential route of human inhalation exposure. We compared short-term responses of human embryonic lung fibroblasts to four sub-100 nm nanoplastic formulations: crosslinked PMMA particles (PMMA-70, PMMA-90) and styrene/sodium p-styrenesulfonate/methacrylic acid copolymers (PS-65, PS-80). Cells were exposed for 1, 3, or 24 h, and metabolic activity (MTT), mitochondrial membrane potential, intracellular oxidant-associated fluorescence (DCF), DNA-damage-response markers (8-oxo-dG, γH2AX, BRCA1), and protein-associated signals (NOX4, NRF2, NF-κB, STAT3, PCNA, BAX/BCL2, LC3, Beclin-1) were assessed. In equal-mass concentration–response experiments, PMMA-70 reduced the MTT signal at substantially lower nominal concentrations than the other formulations, whereas PMMA-90 showed the lowest apparent cytotoxicity. Molecular endpoints were measured at 28 µg/mL (PS-65, PS-80, PMMA-90) and, owing to its higher cytotoxicity, at 0.08 µg/mL (PMMA-70); the resulting profiles are formulation-specific and do not constitute dose-matched comparisons. DCF-associated fluorescence did not change significantly, whereas NOX4-, NRF2-, γH2AX-, and BRCA1-associated signals showed formulation- and time-dependent changes. Across the tested conditions, the formulations were generally associated with lower total intracellular NF-κB-associated fluorescence, with the most pronounced decreases observed after 24 h for PS-65 and PMMA-90 (to ~40% and ~20% of the control signal, respectively). In complete culture medium, PMMA-based formulations formed 180–200 nm hydrodynamic dispersions versus 81–90 nm for PS-based formulations, showing that nominal primary particle size does not describe the exposure-relevant particle state. These descriptive profiles warrant follow-up studies with matched doses, functional cellular endpoints, and physiologically relevant exposure models.
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