Adhesion of antibody-functionalized polymersomes

Langmuir : the ACS Journal of Surfaces and Colloids
John J LinDaniel A Hammer

Abstract

Polymersomes are vesicles made from synthetic block copolymers. The adhesiveness of micron-sized polymersomes, functionalized with antibodies that bind to vascular cell adhesion molecules, which could be useful for vascular targeting, was measured. Intercellular adhesion molecule-1 (ICAM-1) is an endothelial cell adhesion molecule whose expression increases during inflammatory disease, and is therefore a natural target for vascular delivery. We functionalized polymersomes with an anti-ICAM-1 antibody, using modular biotin-avidin chemistry. Micropipet aspiration was used to confirm specific adhesion and measure the adhesion strength between an anti-ICAM-1-coated polymersome and an ICAM-1-coated polystyrene microsphere at various surface densities of adhesion molecules. The adhesion is kinetically trapped, and adhesion strength is quantified by the critical tension for detachment. The adhesion strength increases in proportion to the surface density of anti-ICAM-1 molecules, in contrast to results seen previously when measuring adhesion between biotinylated vesicles and avidin-coated beads (Lin et al. Langmuir 2004, 20, 5493). The difference in dependence on the density of functional groups is likely due to the molecular presentat...Continue Reading

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