Molecular dynamics simulations of hydrophilic pores in phospholipid bilayers and Fe3O4 nanoparticles loaded with the 5-fluorouracil anticancer drug

Abstract

The interaction of a PEGylated and non-PEGylated Fe3O4 nanoparticle drug-delivery system, with 5-fluorouracil (5-FU) as the chemotherapy drug, is investigated via atomistic molecular dynamics (MD). The induced pore formation in a dipalmitoylphosphatidylcholine (DPPC) bilayer phospholipid (BLPL) is studied, and the resulting hourglass-shaped pores with hydrophilic lipid headgroups lining the pores are observed. Furthermore, we optimize the required number of ligands that are required to allow for the formed pores to spontaneously reseal. Additionally, the number of water molecules that transverse through the water bridge is investigated. These results may be useful to design nanocarrier systems that will maintain the cellular osmotic pressure and stability, while the 5-FU is converted to the required metabolites inside the cell to serve its purpose as a chemotherapeutic drug.