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Evidence on Invasion of Blood, Adipose Tissues, Nervous System and Reproductive System of Mice After a Single Oral Exposure: Nanoplastics versus Microplastics.
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Researchers found that after a single oral exposure in mice, nanoplastics were rapidly absorbed into the blood, accumulated in fat tissues, and crossed both the blood-brain and blood-testis barriers. The study demonstrated that the distribution and behavior of plastic particles in mammals is strongly dependent on particle size, with nanoplastics showing substantially greater tissue penetration than microplastics.
After a single oral exposure, NPs are absorbed rapidly in the blood, accumulate in adipose tissues, and penetrate the blood-brain/testis barriers. As expected, the toxicokinetics of MPs is significantly size-dependent in mammals.
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Mice exposed to polystyrene nanoparticles (100 nm) and microparticles (3 µm) via different routes showed that smaller particles appeared rapidly in blood and were detected in urine, while larger particles cleared more slowly. The study provides direct evidence that nanoplastics can cross biological barriers and enter circulation, with potential for distribution throughout the body.
The Uptake and Distribution Evidence of Nano- and Microplastics in vivo after a Single High Dose of Oral Exposure.
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This in vivo study provided evidence on the uptake and organ distribution of nano- and microplastics following a single high-dose administration, finding that nanoplastics translocated rapidly to multiple organs through blood circulation while only small amounts of larger microplastics penetrated organs.
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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.
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Researchers gave mice nanoplastics at doses estimated to match real-world human exposure levels and found the particles crossed the intestinal barrier and accumulated in the liver and kidneys. Even at these low, environmentally relevant doses, the nanoplastics caused oxidative stress and tissue damage across multiple organs. The findings suggest that everyday nanoplastic exposure may pose broader health risks than previously assumed.
Toxic Effects of Nanoplastics on Animals: Comparative Insights into Microplastic Toxicity
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This review compares the toxic effects of nanoplastics versus microplastics across mammals, fish, and invertebrates, finding that nanoplastics generally cause more severe harm because their tiny size allows them to cross biological barriers and enter cells more easily. In mammals, nanoplastics can cross the blood-brain barrier and cause brain inflammation, liver and kidney damage, and reproductive problems that can even pass to future generations. The findings suggest that as plastics in the environment break down into ever-smaller particles, the health risks may actually increase.
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