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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.
Airborne microplastics (MPs) are increasingly recognised as a prominent environmental and public health concern, with evidence of human inhalation. However, their behaviour and fate within the respiratory system remain poorly understood. This review synthesises current knowledge on the mechanisms of MP inhalation and deposition in the respiratory tract, with particular emphasis on their interactions with the respiratory epithelial barrier. Physiochemical properties influencing MP deposition such as size, shape, density, and surface charge are discussed, alongside host-related factors including airway geometry, breathing patterns, and the influence of environmental humidity. The contributions of mucociliary clearance and macrophages as frontline defence against these pollutants are also reviewed. Critical evaluation of in vitro and in vivo experiments indicates that MPs cause epithelial barrier dysfunction, highlighting instances of endoplasmic reticulum stress, oxidative stress, mitochondrial dysfunction, inflammation, and disturbances to tissue repair and development that could potentially aggravate respiratory diseases. Despite growing evidence of adverse effects, significant deficiencies remain in the existing scope of research, particularly on the chronic health consequences of airborne MP exposure. This review necessitates the need for long-term inhalation studies, more diverse representative particle models, and mechanistic investigations to clarify the long-term implications of airborne MP exposure on human health.
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Inhaled Microplastics as Emerging Respiratory Toxicants: From Cellular Mechanisms to Global Health Policy
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This review pulls together a decade of research on tiny plastic particles floating in the air we breathe, finding that once inhaled, they can trigger inflammation, cell damage, and immune disruption deep in the lungs, effects linked to conditions like asthma, COPD, and even lung cancer. The risk may be even greater since these particles often carry other harmful substances like heavy metals along for the ride. That said, scientists still lack standardized ways to measure this exposure, so more consistent research is needed before we fully understand how worried we should be, but it's a good reason to pay attention to air quality and plastic pollution in daily life.
Airborne microplastics: A narrative review of potential effects on the human respiratory system
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This review consolidates research on airborne microplastics and their potential effects on the human respiratory system. Studies show that inhaled microplastics can deposit in the lungs, trigger inflammation, cause oxidative stress, and lead to cell damage and death. While human exposure evidence is still limited, animal and cell studies suggest that long-term inhalation of airborne microplastics could pose significant risks to lung health.
Airborne microplastics: Consequences to human health?
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Researchers reviewed existing evidence on airborne microplastics and their potential effects on human respiratory health. Studies of workers exposed to plastic fibers and particles have documented airway inflammation and breathing difficulties, suggesting that susceptible individuals may face health risks even from environmental concentrations. The paper calls for greater awareness and future research into the health consequences of inhaling microplastic particles.
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.
Polypropylene Microplastics Disrupt Epithelial Barrier Integrity and Viability in Human Airway Epithelial Cells
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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.
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