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Molecular Insights into Nanoplastic Incorporation in Lipid Bilayers: Theory, Simulation and Experiment
Summary
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.
We use molecular dynamics simulations, free energy calculations, the theory of random walks in confined spaces and atomic force microscopy indention experiments to explore the interaction of polymer with lipid bilayers. As simplified theoretical model systems, we use bilayers in contact with oligostyrenes (5 and 10 monomers) or oligoethylenes (2, 4 and 8 monomers) in an aqueous environment. Molecular dynamics simulations attest the localization of oligomers within the lipid bilayer, and free energy computations suggest a notably small activation barrier for the process of small polymer chain incorporation. For a rigid lipid bilayer, an entropic barrier limits the import of a polymer chain with a radius of gyration comparable to the diameter of the layer's hydrophobic core, which amounts to roughly three nanometers. Based on these results and the experiments, we suggest anchoring to lipid bilayers by chains protruding from nanoparticles as the initial stage of import into cells, multi-cellular organisms and tissues.