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Quantifying nanoplastic cellular interactions and uptake pathways by label-free plasmonic imaging
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Scientists used a special microscope technique to watch, in real time, exactly how tiny plastic particles (nanoplastics) get into human cells — finding that the vast majority (over 85%) are actively pulled inside by the cell itself, rather than just passively slipping in or sticking to the surface. This matters because understanding *how* nanoplastics enter our cells is a critical first step toward figuring out whether — and how — they might cause harm, especially as these particles are increasingly found in our food, water, and even bodies.
Nanoplastics are increasingly detected in environmental and biological systems, yet quantitative understanding of their cellular interactions and uptake pathways remains limited, particularly under label-free conditions. Here, we employ surface plasmon resonance microscopy (SPRM) to investigate nanoplastic-cell interactions in real time with single-cell resolution. Using 200 nm polystyrene nanoparticles and HEK293 cells as a model system, we quantify the relative contributions of nanoplastic association with cells, including surface adsorption (8.47%), passive uptake (5.95%), and active internalization (85.58%), the latter further comprising clathrin-mediated (44.35%), caveolae-mediated (46.26%), and macropinocytosis-mediated pathways (9.39%). This study establishes SPRM as a label-free platform for quantitatively analyzing nanoplastic-cell interactions and provides a foundation for extending such analyses to more complex and environmentally relevant nanoparticle systems. SYNOPSIS: A label-free surface plasmon resonance microscopy approach quantitatively dissects nanoplastic-cell interaction pathways at the single-cell level.
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Scientists used a powerful new microscope technique to watch tiny plastic particles enter cells and travel toward the nucleus in real time, revealing that this journey isn't a simple, one-way trip, cells can actually push some particles back out. The study also found that these nanoplastics briefly touch mitochondria (the cell's energy factories) in ways that may trigger cell stress, and that older imaging methods likely underestimated how much plastic actually builds up inside cells by as much as 100%. This matters because it gives researchers better tools to understand exactly how the nanoplastics we're increasingly exposed to might damage our cells
Quantifying Cellular Uptake of Nanoplastics In Vitro: A Workflow for Fluorescently Labeled Nanosized Polystyrene Particles.
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Scientists developed a reliable way to measure exactly how many nanoplastic particles get absorbed into human cells, using lung cells as a test case since we breathe in these tiny plastic bits from the air. Using two different measurement methods that confirmed each other, they found that lung cells readily soak up plastic nanoparticles, nearly every cell took some in, accumulating around 1,000 particles each after just one day of exposure. This matters because having a trustworthy measurement tool is a crucial first step for scientists to figure out whether the nanoplastics we're constantly exposed to actually pose health risks.
Clinically derived micro- and nanoplastics uptake drives spatiotemporally confined metabolic stress revealed by bond-selective imaging
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Scientists watched, in real time, what happens when tiny plastic particles enter human cells—and found that the real damage happens during the moment of uptake, not from plastic sitting inside cells long-term. Once cells stopped being exposed to new particles, they actually recovered, even with plastic still inside them. This suggests that limiting ongoing exposure to microplastics may matter more than worrying about plastic that's already accumulated in our bodies, and it points to possible ways (like special coatings) to make plastics less harmful in the future.
Recent insights into uptake, toxicity, and molecular targets of microplastics and nanoplastics relevant to human health impacts
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This review summarizes what scientists know about how tiny plastic particles enter the human body and cause harm at the cellular level, including through inflammation, oxidative stress, and disruption of important cell signaling pathways. Americans are estimated to consume tens of thousands to millions of micro- and nanoplastic particles per year, and these particles can penetrate cells and tissues throughout the body.
Morphological and chemical characterization of nanoplastics in human tissue
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Researchers developed methods to visualize and chemically characterize nanoplastics that have accumulated in human tissue samples. They were able to identify plastic particles smaller than one micrometer within tissue using advanced microscopy and spectroscopy techniques. The study provides some of the first direct evidence of nanoscale plastic accumulation in the human body, which is essential for designing future health effects research.
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