title: Blood circulation and tissue biodistribution of lipid--quantum dot (L-QD) hybrid vesicles intravenously administered in mice.
abstract: The present work describes the pharmacokinetics of recently developed liposome-quantum dot (L-QD) hybrid vesicles in nude mice following systemic administration. Hydrophobic QD were incorporated into different bilayer compositions, and the serum stability of such hybrid vesicles was evaluated using turbidity and carboxyfluorescein release measurements. L-QD hybrid blood profile and organ biodistribution were also determined by elemental (cadmium) analysis. Following intravenous administration, different tissue biodistribution profiles and tissue affinities were observed depending on the L-QD lipid bilayer characteristics. Immediate blood clearance was observed with cationic (DOTAP/DOPE/Chol) hybrid with rapid lung accumulation, while incorporation of PEG at the surface of zwitterionic vesicles dramatically prolonged their blood circulation half-life after systemic administration. Overall, the L-QD hybrid vesicle system is considered a viable platform that allows QD delivery to different tissues through facile modulation of the hybrid vesicle characteristics. In addition, L-QD offers many opportunities for the development of combinatory therapeutic and imaging (theranostic) modalities by incorporating both drug molecules and QD within the different compartments of a single vesicle.
authors: Nanomedicine Lab, Centre for Drug Delivery Research, The School of Pharmacy, University of London, London WC1N 1AX, United Kingdom.
authors: Wafa' T
authors: WT
authors: Al-Jamal
authors: Khuloud T
authors: KT
authors: Al-Jamal
authors: Andrew
authors: A
authors: Cakebread
authors: John M
authors: JM
authors: Halket
authors: Kostas
authors: K
authors: Kostarelos
mesh_terms: D000818:Animals; D006207:Half-Life; D007275:Injections, Intravenous; D008055:Lipids / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D008081:Liposomes / Q000737:chemistry / Q000493:pharmacokinetics; D051379:Mice; D045663:Quantum Dots; D014018:Tissue Distribution
chemical_list: D008055:Lipids; D008081:Liposomes