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Incorporationof Oligo(Styrene), Oligo(Butadiene),Oligo(Methyl Methacrylate), and Oligo( tert -ButylAcrylate) Droplets in Giant Unilamellar Vesicles
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Using lab-made cell membranes as stand-ins for real ones, scientists tested how tiny plastic fragments (the kind microplastics break down into) interact with cell membranes, and found that these plastic bits don't just sit on the surface, but actually wedge themselves inside or attach to the membrane, with different plastics behaving differently. This matters because it suggests that as microplastics break down in the environment, their smaller fragments could potentially embed into our cells' membranes and disrupt how those membranes are organized, though this study used simplified lab models rather than real human cells, so more research is needed to confirm health effects.
Abstract In the environment, microplastics fragment and degrade into plastic oligomers, posing potential risks to ecosystems and human health. In the present study, the interactions between giant unilamellar vesicles (GUVs) and liquid droplets of oligo(styrene), oligo(butadiene), oligo(methyl methacrylate), and oligo(tert-butyl acrylate) were investigated using fluorescence microscopy. GUVs were used in a homogeneous fluid state or in a phase-separated state consisting of either a liquid-disordered (Ld) phase and a solid-ordered (So) phase, or a Ld phase and a liquid-ordered (Lo) phase. The effects of plastic oligomers on membrane structures vary depending on the oligomer type. Oligo(styrene), oligo(butadiene), and oligo(tert-butyl acrylate) droplets were homogeneously embedded between the monolayer leaflets, whereas the oligo(methyl methacrylate) droplets were bound to the bilayers through inhomogeneous membrane structures, regardless of the lipid composition. The bilayer phase separations were retained after oligomer incorporation, except for the Ld/So phase-separated bilayer exposed to oligo(tert-butyl acrylate). In this exceptional case, no domain structures were visible in the fluorescence images. In the Ld/So phase-separated bilayer, the oligo(styrene) and oligo(butadiene) droplets were distributed exclusively in the Ld phase, and were all pinned at the domain boundaries. In the Ld/Lo phase-separated bilayer, the oligo(styrene), oligo(butadiene), and oligo(tert-butyl acrylate) droplets invariably localized to the Ld phase, with approximately half anchored to domain boundaries. The data also suggested that in the Ld/So bilayer, oligo(methyl methacrylate) molecules were predominantly partitioned into the Ld phase, whereas in the Ld/Lo bilayer, they were slightly more soluble in the Ld phase than in the Lo phase. Furthermore, the slight solubility of oligo(methyl methacrylate) in water enabled its incorporation into homogeneous fluid bilayers via two pathways: transfer from an in-bilayer droplet to the matrix bilayer and transfer from aqueous solution.
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