title: Intracellular release of endocytosed nanoparticles upon a change of ligand-receptor interaction.
abstract: During passive endocytosis, nanosized particles are initially encapsulated by a membrane separating it from the cytosol. Yet, in many applications the nanoparticles need to be in direct contact with the cytosol in order to be active. We report a simulation study that elucidates the physical mechanisms by which such nanoparticles can shed their bilayer coating. We find that nanoparticle release can be readily achieved by a pH-induced lowering of the attraction between nanoparticle and membrane only if the nanoparticle is either very small or nonspherical. Interestingly, we find that in the case of large spherical nanoparticles, the reduction of attraction needs to be accompanied by exerting an additional tension on the membrane (e.g., via nanoparticle expansion) to achieve release. We expect these findings will contribute to the rational design of drug delivery strategies via nanoparticles.
authors.affiliation: National Centre for Biomolecular Research, Faculty of Science and CEITEC-Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00 Brno-Bohunice, Czech Republic. robert.vacha@mail.muni.cz
authors.forename: Robert
authors.initials: R
authors.lastname: Vácha
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Martinez-Veracoechea
authors.forename: Daan
authors.initials: D
authors.lastname: Frenkel
mesh_terms: D002462:Cell Membrane / Q000378:metabolism; D004705:Endocytosis; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D042541:Intracellular Space / Q000378:metabolism*; D008024:Ligands; D008968:Molecular Conformation; D056004:Molecular Dynamics Simulation; D053758:Nanoparticles; D010316:Particle Size; D010743:Phospholipids / Q000378:metabolism; D011485:Protein Binding; D012997:Solvents / Q000737:chemistry; D013816:Thermodynamics
chemical_list: D008024:Ligands; D010743:Phospholipids; D012997:Solvents