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Size-Dependent Pulmonary Toxicity and Whole-Body Distribution of Inhaled Micro/Nanoplastic Particles in Male Mice from Chronic Exposure
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Researchers exposed mice to airborne micro- and nanoplastic particles through normal breathing over an extended period and found the highest accumulation in the lungs, followed by the blood and spleen. Surprisingly, the larger 1-micrometer microplastics caused more severe lung damage than the smaller 80-nanometer particles, triggering inflammation, cell death, and scarring. These findings highlight that breathing in airborne plastic particles poses real health risks, with particle size playing an important role in the type of damage caused.
The ubiquitous presence of micro/nanoplastics (MP/NP) in the atmosphere has raised significant concerns about their potential health risks through inhalation, yet the effects of natural respiratory exposure remain underexplored. This study addresses this critical knowledge void by utilizing a whole-body inhalation exposure system to investigate the distribution, accumulation, and pulmonary toxicity of polystyrene MP/NP (1.5 × 105 particles/m3) in male ICR mice (n = 16/group). Fluorescently labeled MP/NP revealed the highest particle accumulation in the lungs, followed by the bloodstream and spleen, with minimal detection in the brain. Unsurprisingly, 80 nm nanoplastics displayed greater intertissue transport efficiency than 1 μm microplastics. Chronic exposure to both microplastics and nanoplastics disrupted oxidative balance and exacerbated oxidative stress within the extracellular environment of the lungs. The impaired antioxidant defenses and disrupted intra- and extracellular metabolism led to inflammation, apoptosis, and fibrosis. Intriguingly, 1 μm microplastics induced more severe pulmonary toxicity than their smaller counterparts, promoting epithelial-mesenchymal transition and fibrosis. These findings underscore the need for a nuanced understanding of size-dependent toxicities of inhalable plastic particles and highlight the health risks posed by airborne MP/NP.
More Papers Like This
Size-Dependent PulmonaryToxicity and Whole-Body Distributionof Inhaled Micro/Nanoplastic Particles in Male Mice from Chronic Exposure
AI summary Read the abstract
Researchers used a whole-body inhalation exposure system to chronically expose male mice to polystyrene micro- and nanoplastics at environmental concentrations and tracked particle distribution and lung toxicity. Nanoplastics (80 nm) showed greater tissue transport than microplastics (1 µm), with highest accumulation in lungs followed by blood and spleen, and both sizes disrupted oxidative balance and antioxidant defenses.
Deleterious effects of microplastics and nanoplastics on rodent lungs: a systematic review
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This systematic review summarizes research on how inhaled micro- and nanoplastics affect the lungs in animal studies. The findings show these particles can cause lung inflammation, tissue damage, and immune responses, suggesting that breathing in airborne microplastics may pose real risks to respiratory health.
Inhalation of Environmental Polystyrene Micro/Nanoplastics Induces Pulmonary Toxicity and Synergistically Exacerbates Acute Lung Injury in Male Mice
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Breathing in tiny plastic particles—like those found in air pollution—caused lung inflammation and breathing problems in mice, even without any other health issues. Even more concerning, mice that had already inhaled these plastic particles got much sicker when exposed to a bacterial infection afterward, suggesting that everyday plastic pollution in the air we breathe could make our lungs more vulnerable to future illness. Smaller "microplastic" particles (as opposed to even tinier "nanoplastics") seemed to cause the most damage, highlighting that size matters when it comes to how harmful these particles are.
Analysis of Biodistribution and in vivo Toxicity of Varying Sized Polystyrene Micro and Nanoplastics in Mice
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This study found that smaller plastic particles spread more widely through the bodies of mice and caused more organ damage than larger ones, particularly in the liver, kidneys, and heart. Nanoplastics (under 1 micrometer) were especially concerning because they crossed biological barriers more easily than microplastics. The results suggest that the tiniest plastic particles in our environment may pose the greatest health risks.
In vivo toxicity assessment of microplastics in Balb/C mice : study of inhalation exposure and its inflammatory effects
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Researchers examined the in vivo toxicity of inhaled microplastics in Balb/C mice, studying pulmonary inflammation, oxidative stress, and systemic effects following repeated inhalation exposure. The study found dose-dependent lung inflammation and evidence of particle translocation to other organs.
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