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Targeting and ultrasound imaging of microbubble-based contrast agents
Authors:Alexander L. Klibanov  Michael S. Hughes  Flordeliza S. Villanueva  Ron J. Jankowski  William R. Wagner  Jolette K. Wojdyla  James H. Wible  Gary H. Brandenburger
Affiliation:(1) Mallinckrodt Inc., 675 McDonnell blvd., P.O. Box 5840, 63134 St. Louis, MO, USA;(2) University of Pittsburgh, 15213 Pittsburgh, PA, USA
Abstract:Preparation and characterization of targeted microbubbles (ultrasound contrast agents) is described. Specific ligands were attached to the microbubble shell, and ligand-coated microbubbles were selectively attached to various targets, using either an avidin-biotin model system or an antigen-antibody system for targeting to live activated endothelial cells. Firm attachment of microbubbles to the target was achieved. Forces necessary to detach microbubbles from the target were estimated to exceed dozens of pN. Microbubbles were bound to the target even in the rapidly moving stream of the aqueous medium. Down to 20 ng of the ultrasound contrast material on the target surface could be detected by the ultrasound imaging with a commercial medical imaging system. At high bubble density on the target surface, strong ultrasound image attenuation was observed.
Keywords:Ultrasound  Microbubbles  Contrast agents  Targeting  Imaging
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