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Distinct mitochondrial response patterns to PM2.5 and microplastic exposure in healthy and asthmatic bronchial epithelial cells: an exploratory pilot study
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Lab tests on airway cells found that fine air pollution particles (PM2.5) push healthy cells' energy-producing "engines" (mitochondria) to work harder without breaking down, but in cells from people with asthma, those same engines couldn't keep up—leaving them more stressed and vulnerable to damage. Microplastic fibers had a different, mixed effect: they boosted energy production in some asthma-related conditions but also caused cells to weaken over time when combined with certain triggers. This suggests people with asthma may be more biologically vulnerable to air pollution and microplastic exposure, highlighting why reducing
Air pollution impairs mitochondrial biology through mechanisms driven by oxidative stress, excessive reactive oxygen species (ROS) production, apoptosis, and tissue injury. Specific components of air pollution—particularly PM 2.5 and microplastic fibers — disrupt mitochondrial function via multiple interconnected pathways. The study aimed to evaluate the mitochondrial function in bronchial epithelial cells from healthy and asthmatic donors following exposure to PM 2.5 and/or microplastics. Primary bronchial epithelial cells from healthy and asthma groups were cultured in control, lipopolysaccharide (LPS), cigarette smoke extract (CSE), and allergic (house dust mite [HDM] + IL-13)-treated models and stimulated with microplastic fibers and/or PM 2.5 for 24 h. The mitochondrial activity (Seahorse) and ROS production were measured. In healthy cells, 24-h exposure to PM 2.5 increased maximal mitochondrial respiration across all conditions and basal and ATP-dependent production in the CSE-stimulated group, with no signs of exhaustion. In asthma cells, however, ROS production was not matched by increased mitochondrial activity, suggesting impaired adaptive responses. PM 2.5 exposure partially attenuated the increase in maximal respiration induced by allergic stimulation in asthma cells. Microplastic exposure exhibited a distinct pattern: it did not increase ROS, but enhanced mitochondrial metabolism (basal respiration and ATP-dependent respiration) in LPS and CSE, and HDM/IL-13 (maximal respiration and ATP-dependent respiration) treated asthma cells, yet reduced cell viability after 48 h in LPS-treated asthma cells, suggesting early mitochondrial fatigue under this condition. PM 2.5 exposure alters mitochondrial activity via oxidative stress, imposing greater metabolic stress and potential harm to bronchial epithelial cells from individuals with asthma, while exerting lower negative effects on cells from healthy donors. Microplastic exposure had context-dependent effects in asthmatic bronchial epithelial cells.
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Air pollution and microplastic as modifiers of epithelial injury and repair in models of acute, chronic, and allergic airway inflammation
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Scientists exposed lab-grown human airway cells to air pollution particles and microplastic fibers, and found the combo was more damaging when the cells were already stressed—whether from allergies, smoking-related damage, or infection. This suggests that people with existing lung conditions like asthma or COPD may be especially vulnerable to the health effects of breathing in pollution and microplastics, since their airway cells have a harder time repairing themselves under this "double hit."
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Tiny pollution particles, from air pollution soot and even nanoplastics, all stress out the "power plants" inside our immune cells (mitochondria) in a similar way, triggering inflammation that could contribute to disease. Each type of particle does this on its own timeline: soot from combustion causes long-lasting cell damage, while nanoplastics cause a milder but still persistent stress response. This matters because it suggests a shared biological pathway behind the health harms of air pollution and plastic pollution, and it points scientists toward specific molecules that could one day be used to detect this damage early or develop treatments to protect against it.
The impaired response of nasal epithelial cells to microplastic stimulation in asthma and COPD
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Researchers exposed nasal lining cells from healthy people, asthma patients, and COPD patients to polyamide microplastic fibers and found that diseased airways responded very differently than healthy ones. Asthma cells showed changes in cholesterol metabolism and stress responses, while COPD cells showed altered immune cell movement and signaling. This suggests that people with existing respiratory conditions are more vulnerable to the harmful effects of inhaled microplastic fibers.
Microplastics in pediatric asthma: Clinical associations with disease severity
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Researchers found tiny plastic particles (microplastics) in the lung mucus of every single child with asthma they tested, and kids with worse-controlled asthma had higher levels of these particles in their airways. Lab experiments on lung tissue models suggested these plastics may trigger harmful cell stress and inflammation, though more research is needed to confirm this actually causes the asthma symptoms rather than just being linked to them. This study is a reminder that the air we breathe, and the plastic particles in it, may be quietly affecting respiratory health, especially in children.
Detrimental effects of microplastic exposure on normal and asthmatic pulmonary physiology
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Researchers exposed both healthy and asthmatic mice to airborne microplastics and found significant lung inflammation, immune activation, and increased mucus production in both groups. Microplastic particles were taken up by immune cells called macrophages, and gene analysis revealed changes in immune response, cellular stress, and cell death pathways. The study suggests that inhaling microplastics may worsen respiratory health in both normal and vulnerable populations.
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