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A component-resolved in vitro skin barrier model for assessing nanoplastic retention and barrier susceptibility.
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Scientists tested how tiny plastic particles interact with different building blocks of your skin's outer barrier, like fats, proteins, and cholesterol, finding that fatty acids trap far more particles than other components. This early stage lab research helps explain which parts of skin might let nanoplastics through, but it's exploratory and doesn't yet prove how much plastic actually penetrates real skin.
Human-relevant in vitro models are needed to assess dermal nanoplastic hazards, yet current skin penetration approaches often treat the stratum corneum as a compositionally uniform barrier. This limits mechanistic understanding of how barrier biochemistry relates to nanoplastic retention, particularly in skin states with altered lipid or protein organization. Here, we developed a component-resolved in vitro stratum corneum model to quantify interactions between 50 nm polystyrene nanoplastics and six major skin barrier constituents: ceramide, cholesterol, keratin, palmitic acid, proline, and phenylalanine. Component-specific operational retention indices (RAI) were determined using standardized gravity-driven flow experiments and high-resolution transmission electron microscopy, then integrated into a multi-phase penetration model. Retention differed markedly among components. Palmitic acid, representing free fatty acids, showed the highest operational retention, retaining approximately 26-fold more particles than keratin. Protein-rich and sterol-associated components displayed lower initial retention but greater time-dependent accumulation, an apparent trend that with only three time points cannot be assigned to a defined kinetic regime. Ex vivo two-photon imaging of porcine skin showed an apparent detectable fluorescence depth of 12.3 ± 2.1 μm; this was not used to calibrate or validate the dimensionless component-weighted score. The framework is exploratory and mechanistic, characterizing how stratum corneum constituents differ in operational retention of nanoplastics, providing a hazard-relevant basis for, rather than a validated prediction of, dermal penetration.
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Researchers studied how nanoplastic particles interact with human skin cells when the protective outer skin layer is compromised. They found that nanoplastics readily penetrate and accumulate inside skin cells, triggering stress responses and activating inflammatory pathways -- suggesting that people with damaged or sensitive skin may be especially vulnerable to nanoplastic absorption.
[Microplastic and skin-an update].
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This review summarizes current evidence on microplastics (1–5000 µm) and nanoplastics as skin-relevant pollutants, covering how they enter and interact with skin tissue. Evidence suggests dermal uptake is possible, particularly through damaged skin, and that these particles may carry additional chemical hazards.
Penetration of Microplastics and Nanoparticles Through Skin: Effects of Size, Shape, and Surface Chemistry
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This review examines how micro- and nanoplastics can penetrate human skin, with smaller particles being more likely to pass through. Beyond direct toxicity, these tiny plastic particles may also carry harmful chemicals through the skin barrier, acting as unwanted delivery vehicles for toxic substances we encounter in the environment.
The effects of size and surface functionalization of polystyrene nanoplastics on stratum corneum model membranes: An experimental and computational study
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Researchers studied how polystyrene nanoplastics of different sizes and surface modifications interact with the outermost layer of human skin, the stratum corneum. Using both experiments and computer simulations, they found that particle size and surface chemistry significantly affected how nanoplastics disrupted skin barrier membranes. The study provides early evidence that nanoplastics could potentially compromise the skin's protective barrier, which is relevant to understanding dermal exposure risks.
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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