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Spatiotemporal fate of nanoplastics: From membrane encounter to perinuclear confinement revealed by STED microscopy
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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
Nanoplastics (NPs) are ubiquitous environmental contaminants, yet their subcellular fate from membrane encounter to destination remains poorly understood due to limitations in imaging resolution. Here, we address this gap by using stimulated emission depletion (STED) super-resolution microscopy to visualize the complete intracellular journey of individual NPs at nanoscale precision. A photostable AIEgen-core NP enabled resolution of individual NPs and real-time tracking of their nanoscale spatial relationships with subcellular structures. Using a methodologically elevated NP concentration, live-cell STED revealed that internalization was an active, migration-driven process involving filopodia-initiated probing, partial engulfment followed by particle release, and successful perpendicular uptake, challenging assumptions that membrane contact necessarily leads to bioaccumulation. Intracellularly, NPs moved rapidly within lysosomes toward the perinuclear region (peak speeds ∼0.15 μm/s), undergoing fusion dynamics that modulated mobility. Mitochondria exhibited transient "kiss-and-run" NP contact, which could be associated with stress-induced donut-shaped morphology and oxidative stress elevation. Quantitative 3D projection by STED revealed that conventional 2D imaging underestimated intracellular NP burden by up to 100% under low-count conditions. High-resolution STED differentiated true lysosomal encapsulation from mere proximity, revealing a lysosome-independent pathway for nuclear-proximal NP enrichment. These findings highlight STED microscopy's potential in advancing NP risk assessment and establish a mechanistic foundation for understanding NP-induced toxicity at the subcellular level.
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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.
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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.
Molecular Insights into Nanoplastic Incorporation in Lipid Bilayers: Theory, Simulation and Experiment
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Scientists used computer simulations and lab experiments to study how tiny plastic fragments (nanoplastics) get into our cells by slipping into the fatty membranes that surround them. They found that small plastic chains can easily wedge into these membranes, especially if bits of plastic "stick out" from larger nanoparticles like tiny anchors—suggesting this may be a key first step in how plastic pollution actually invades our cells and tissues. This matters because as microplastics and nanoplastics become more common in our environment, understanding exactly how they breach our cells could help scientists figure out what health risks they might pose.
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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.
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Scientists developed a new imaging technique that lets them track exactly where plastic nanoparticles end up in the body and see how they disrupt normal chemistry at the same time. Using this method in mice, they found that plastic particles entering the bloodstream mostly collected in the lungs and triggered changes in metabolism, while particles breathed into the lungs stayed there for weeks, causing lasting disruptions. This matters because it gives researchers a powerful new tool to study how the micro/nanoplastics we're increasingly exposed to might affect our health over time.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.