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Antibodies 2012, 1(2), 199-214; doi:10.3390/antib1020199

Dual Targeting of Tumor Cells with Bispecific Single-Chain Fv-Immunoliposomes

1, 2, 1, 1 and 1,*
1 Institut für Zellbiologie und Immunologie, Universität Stuttgart, Allmandring 31, 70569 Stuttgart, Germany 2 Institut für Pharmazie, Friedrich-Schiller Universität Jena, Lessingstraße 8, 07743 Jena, Germany
* Author to whom correspondence should be addressed.
Received: 8 May 2012 / Revised: 9 July 2012 / Accepted: 13 July 2012 / Published: 25 July 2012
(This article belongs to the Special Issue Bispecific Antibodies for Dual Targeting Strategies)
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Antibody fragments, especially single-chain Fv fragments, have been established for the generation of immunoliposomes for targeted drug delivery in cancer therapy and other applications. Bispecific immunoliposomes should be useful for dual targeting addressing inter- and intratumoral heterogeneity of tumor antigen expression. Here, we established a protocol to generate dual-targeted immunoliposomes using genetically engineered scFv molecules recognizing two different tumor-associated antigens, EGFR and CEA (CEACAM5), applying a step-wise insertion of antibody-coupled micelles into preformed PEGylated liposomes. The dual-targeted immunoliposomes retained binding activity for both antigens and combined the selectivity of both antibodies within one liposome. Thus, these dual-targeted immunoliposomes should be suitable to deliver therapeutic payloads to tumor cells expressing EGFR or CEA, or both antigens.
Keywords: dual targeting; bispecific immunoliposomes; single-chain Fv fragments; tumor targeting dual targeting; bispecific immunoliposomes; single-chain Fv fragments; tumor targeting
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Mack, K.; Rüger, R.; Fellermeier, S.; Seifert, O.; Kontermann, R.E. Dual Targeting of Tumor Cells with Bispecific Single-Chain Fv-Immunoliposomes. Antibodies 2012, 1, 199-214.

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