Targetability of novel immunoliposomes prepared by a new antibody conjugation technique

Targetability of novel immunoliposomes prepared by a new antibody conjugation technique In order to develop long-circulating immunoliposomes (IL), which combine sterical stabilization with a superior targetability, we have introduced a new methodology for attaching monoclonal antibodies direcly onto the distal ends of liposome-grafted polyethylene glycol (PEG) chains. Therefore, we have synthesized a new PEG-PE derivative, which had been endgroup-functionalized with cyanuric chloride. Antibodies can simply be coupled to this membrane anchor in mild basic conditions (pH 8.8) without the need for previous antibody derivatizations. The coupling results have been determined with consideration to various liposome parameters and have been compared to several established antibody coupling procedures, where antibodies had been linked directly to the liposome surface in the presence of PEG (conventional IL). To investigate the targetability of the resulting new IL, anti E-selectin mAb have been coupled and the degree of binding selectin-containing cells has been analyzed. The terminal coupled antibodies show a 1.8-fold higher degree of in vitro cell binding compared to conventional IL, which has been attributed to the antibody position being more easy accessible at the PEG termini. Furthermore, we have illustrated the liposome surface topology and the coupled antibodies by atomic force microscopy, which for such fluid IL has been used first. These images have finely corresponded to the cell binding results, and have been discussed in terms of antibody position and flexibility at the liposome surface. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Pharmaceutics Elsevier

Targetability of novel immunoliposomes prepared by a new antibody conjugation technique

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Publisher
Elsevier
Copyright
Copyright © 1999 Elsevier Science B.V.
ISSN
0378-5173
D.O.I.
10.1016/S0378-5173(99)00002-2
Publisher site
See Article on Publisher Site

Abstract

In order to develop long-circulating immunoliposomes (IL), which combine sterical stabilization with a superior targetability, we have introduced a new methodology for attaching monoclonal antibodies direcly onto the distal ends of liposome-grafted polyethylene glycol (PEG) chains. Therefore, we have synthesized a new PEG-PE derivative, which had been endgroup-functionalized with cyanuric chloride. Antibodies can simply be coupled to this membrane anchor in mild basic conditions (pH 8.8) without the need for previous antibody derivatizations. The coupling results have been determined with consideration to various liposome parameters and have been compared to several established antibody coupling procedures, where antibodies had been linked directly to the liposome surface in the presence of PEG (conventional IL). To investigate the targetability of the resulting new IL, anti E-selectin mAb have been coupled and the degree of binding selectin-containing cells has been analyzed. The terminal coupled antibodies show a 1.8-fold higher degree of in vitro cell binding compared to conventional IL, which has been attributed to the antibody position being more easy accessible at the PEG termini. Furthermore, we have illustrated the liposome surface topology and the coupled antibodies by atomic force microscopy, which for such fluid IL has been used first. These images have finely corresponded to the cell binding results, and have been discussed in terms of antibody position and flexibility at the liposome surface.

Journal

International Journal of PharmaceuticsElsevier

Published: Apr 20, 1999

References

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