title: Translocation of C60 and its derivatives across a lipid bilayer.
abstract: Obtaining an understanding, at the atomic level, of the interaction of nanomaterials with biological systems has recently become an issue of great research interest. Here we report on the molecular dynamics study of the translocation of fullerene C60 and its derivative C60(OH)20 across a model cell membrane (dipalmitoylphosphatidylcholine or DPPC bilayer). The simulation results indicate that, although a pristine C60 molecule can readily "jump" into the bilayer and translocate the membrane within a few milliseconds, the C60(OH)20 molecule can barely penetrate the bilayer. Indeed, the mean translocation time via diffusion for the C60(OH)20 molecule is several orders of magnitude longer than for the former. It was also determined that the two different forms of fullerenes, when adsorbed into/onto the bilayer, affected the membrane structure differently. This study offers a mechanistic explanation of that difference and for the reduced acute toxicity of functionalized fullerenes.
authors.affiliation: Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634, USA. rqiao@ces.clemson.edu
authors.forename: Rui
authors.initials: R
authors.lastname: Qiao
authors.forename: Aaron P
authors.initials: AP
authors.lastname: Roberts
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Mount
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Klaine
authors.forename: Pu Chun
authors.initials: PC
authors.lastname: Ke
mesh_terms: D015060:1,2-Dipalmitoylphosphatidylcholine / Q000737:chemistry / Q000378:metabolism; D001693:Biological Transport, Active; D037741:Fullerenes / Q000493:pharmacokinetics*; D008051:Lipid Bilayers / Q000737:chemistry / Q000378:metabolism*; D008954:Models, Biological; D008958:Models, Molecular; D053758:Nanoparticles / Q000737:chemistry*
chemical_list: D037741:Fullerenes; D008051:Lipid Bilayers; D015060:1,2-Dipalmitoylphosphatidylcholine; C069837:fullerene C60