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Polystyrene nanoplastics impair epithelial barrier establishment and modulate extracellular vesicle release in human bronchial cells cultured at the air-liquid interface
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Scientists exposed lab-grown human airway cells to tiny nanoplastic particles (like those found in breathing air polluted with plastic waste) and found the particles weakened the protective barrier these cells normally form, while also triggering inflammation-related signals. This suggests nanoplastics could make airways more vulnerable, especially in people whose lung lining is already damaged or still developing—though this was shown in a lab model, not in humans breathing polluted air, so more research is needed to confirm real-world impact.
The growing production of plastics has led to widespread environmental contamination by micro- and nanoplastics (MNPLs), raising increasing concern about their potential impact on human respiratory health. Among them, nanoplastics (NPs) can penetrate deeply into the lungs. However, their impact on human bronchial epithelial cells remains poorly characterized. Here, we assessed the effects of 40 nm polystyrene (PS)-NPs on human bronchial Calu-3 cells cultured at the air-liquid interface (ALI) during early epithelial establishment, a three-dimensional model representing a functionally immature or compromised airway epithelial barrier. Chronic exposure (120 h) to PS-NPs (12 and 120 µg/cm²) interfered with barrier establishment in a concentration- and time-dependent manner, as demonstrated by reduced transepithelial electrical resistance (TEER) and decreased expression of the junctional proteins E-cadherin and Zonula Occludens-1 (ZO-1). PS-NPs also promoted the release of multiple inflammatory mediators, with osteopontin (OPN), a recognized biomarker of air pollution exposure, together with IL-2 and IL-10, showing the most consistent increases across both epithelial compartments. Other cytokines displayed concentration- and compartment-dependent secretion patterns. This polarized secretion pattern suggests selective activation of epithelial signaling pathways and paracrine communication toward the submucosal milieu. Furthermore, PS-NPs were internalized by Calu-3 cells and packaged into extracellular vesicles (EVs), a process that may limit acute cellular damage while potentially enabling propagation of NP-induced signals. Overall, these findings indicate that PS-NP exposure perturbs epithelial barrier function and polarized intercellular communication under conditions mimicking a compromised airway epithelium, suggesting a mechanistic role for NPs as aggravating factors of pre-existing epithelial dysfunction.
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Scientists found that tiny polypropylene microplastic particles, the kind used in many plastic products, can damage the cells lining our airways when exposed in lab experiments. The plastics caused cell stress that weakened the "seals" between cells, making the airway barrier leaky. This suggests breathing in microplastics could potentially harm lung health, though more research is needed to confirm this happens in real life.
Polystyrene microplastic particles: In vitro pulmonary toxicity assessment
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Researchers tested the effects of polystyrene microplastics on human lung cells in the laboratory and found that the particles triggered inflammation and oxidative stress. The microplastics also weakened the protective barrier function of lung tissue by depleting key structural proteins. The study suggests that inhaling microplastics may increase the risk of respiratory problems by damaging the lung's natural defenses.
Evaluating the toxicity of polystyrene micro- and nanoplastics in human bronchial epithelial cells: differences and challenges using aerosol and suspension exposures
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Scientists exposed human lung cells to tiny plastic particles (the kind found in air pollution) using two different lab methods, and both showed the cells reacted with inflammation, though the exact signals differed depending on how the plastics were delivered. While the plastics didn't kill the cells or trigger cell damage, the inflammatory response suggests inhaling microplastics could irritate lung tissue over time, but scientists still need to agree on the best way to test this in labs before we know exactly how risky real-world exposure is.
Pathophysiological effects of inhaled airborne microplastics on the respiratory epithelial barrier: A review
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Tiny plastic particles floating in the air we breathe may be doing more damage to our lungs than we realized. This review of existing research found that when these microplastics land in our airways, they can trigger cell stress, inflammation, and damage to the protective lining of our lungs—potentially making respiratory problems worse over time. While scientists still need more long-term studies to fully understand the risks, this research is an early warning sign that the plastic pollution in our air isn't just an environmental issue—it could be a health issue too.
Evaluating the toxicity of polystyrene micro- and nanoplastics in human bronchial epithelial cells: differences and challenges using aerosol and suspension exposures
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Scientists exposed human lung cells to tiny plastic particles (the kind found in air pollution) using two different lab methods, and both showed signs of inflammation in the cells—though the cells didn't die or show classic damage signals. This matters because it adds to growing evidence that breathing in microplastics may trigger low-level lung inflammation, but it also shows that how scientists test these effects in the lab can change the results, so more consistent research is needed before we know exactly how risky everyday plastic exposure really is.
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