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A high‐affinity human monoclonal antibody specific to the alternatively spliced EDA domain of fibronectin efficiently targets tumor neo‐vasculature in vivo

Alessandra Villa

Philochem AG, c/o ETH Zürich, Wolfgang‐Pauli‐Strasse 10, CH‐8093 Zurich, Switzerland

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Eveline Trachsel

Philochem AG, c/o ETH Zürich, Wolfgang‐Pauli‐Strasse 10, CH‐8093 Zurich, Switzerland

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Manuela Kaspar

Philochem AG, c/o ETH Zürich, Wolfgang‐Pauli‐Strasse 10, CH‐8093 Zurich, Switzerland

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Christoph Schliemann

Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zurich, CH‐8093 Zurich, Switzerland

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Roberto Sommavilla

Philochem AG, c/o ETH Zürich, Wolfgang‐Pauli‐Strasse 10, CH‐8093 Zurich, Switzerland

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Jascha‐N. Rybak

Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zurich, CH‐8093 Zurich, Switzerland

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Christoph Rösli

Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zurich, CH‐8093 Zurich, Switzerland

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Laura Borsi

Department of Translational Oncology, Istituto Nazionale per la Ricerca sul Cancro, Genoa, Italy

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Dario Neri

Corresponding Author

E-mail address:neri@pharma.ethz.ch

Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zurich, CH‐8093 Zurich, Switzerland

Fax: +41‐44‐6331358
Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zurich, Wolfgang‐Pauli‐Strasse 10, CH‐8093 Zurich, Switzerland
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First published: 12 February 2008
Cited by: 114

Abstract

The alternatively spliced extra‐domain B of fibronectin is one of the best characterized markers of tumor angiogenesis. Similarly, the extra‐domain A (EDA), which can also be inserted in the fibronectin transcript by a mechanism of alternative splicing, has been shown to preferentially accumulate around new blood vessels in certain tumors, but this antigen has not been investigated so far as a target for antibody‐based biomolecular intervention. We here describe the generation of 3 human monoclonal antibodies (named F8, B7 and D5), which recognize the same epitope of EDA, but which differ in terms of their dissociation constant to the human antigen (KD = 3.1, 16 and 17 nM, measured for monomeric preparations of the F8, B7 and D5 antibodies, respectively, in recombinant scFv format). When the 3 antibody fragments were cloned and expressed with a 5 amino acid linker, the 3 resulting homodimeric antibody preparations displayed comparable tumor: organ ratios in quantitative biodistribution studies, performed in immunocompetent 129SvEv mice, bearing subcutaneous syngeneic F9 murine tumors. The percent injected dose per gram (%ID/g) values in tumors 24 hr after intravenous injection were 9.3, 10.2 and 13 for F8, B7 and D5, respectively. The F8 antibody may serve as useful building block for the development of antibody‐based targeted anti‐cancer therapeutics. Preclinical and clinical investigations are facilitated by the fact that F8 recognizes the human and mouse antigen with comparable affinity, and by the observation that EDA over‐expression is detectable not only in solid tumors, but also in hematological malignancies. © 2008 Wiley‐Liss, Inc.

Number of times cited: 114

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