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EJNMMI Research
Published in: EJNMMI Research 1/2013

Open Access 01-12-2013 | Original research

Generation and in vivo characterization of a chimeric αvβ5-targeting antibody 14C5 and its derivatives

Authors: Caroline Dumolyn, Steve Schoonooghe, Lieselotte Moerman, Sara Neyt, Jurgen Haustraete, Filip De Vos

Published in: EJNMMI Research | Issue 1/2013

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Abstract

Background

Previous studies showed that radiolabeled murine monoclonal antibody (mAb) 14C5 and its Fab and F(ab')2 fragments, targeting αvβ5 integrin, have promising properties for diagnostic and therapeutic applications in cancer. To diminish the risk of generating a human anti-mouse antibody response in patients, chimeric variants were created. The purpose of this study was to recombinantly produce chimeric antibody (chAb) derivatives of the murine mAb 14C5 and to evaluate the in vitro and in vivo characteristics.

Methods

In vitro stability, specificity, and affinity of radioiodinated chAb and fragments (Iodo-Gen method) were examined on high-expressing αvβ5 A549 lung tumor cells. In vivo biodistribution and pharmacokinetic characteristics were studied in A549 lung tumor-bearing Swiss Nu/Nu mice.

Results

Saturation binding experiments revealed high in vitro affinity of radioiodinated chAb, F(ab')2, and Fab, with dissociation constants (K D) of 1.19 ± 0.19, 0.68 ± 0.10, and 2.11 ± 0.58 nM, respectively. ChAb 14C5 showed highest tumor uptake (approximately 10%ID/g) at 24 h post injection, corresponding with other high-affinity Abs. ChF(ab')2 and chFab fragments showed faster clearance from the blood compared to the intact Ab.

Conclusions

The chimerization of mAb 14C5 and its fragments has no or negligible effect on the properties of the antibody. In vitro and in vivo properties show that the chAb 14C5 is promising for radioimmunotherapy, due to its high maximum tumor uptake and its long retention in the tumor. The chF(ab')2 fragment shows a similar receptor affinity and a faster blood clearance, causing less non-specific retention than the chAb. Due to their fast blood clearance, the fragments show high potential for radioimmunodiagnosis.
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Metadata
Title
Generation and in vivo characterization of a chimeric αvβ5-targeting antibody 14C5 and its derivatives
Authors
Caroline Dumolyn
Steve Schoonooghe
Lieselotte Moerman
Sara Neyt
Jurgen Haustraete
Filip De Vos
Publication date
01-12-2013
Publisher
Springer Berlin Heidelberg
Published in
EJNMMI Research / Issue 1/2013
Electronic ISSN: 2191-219X
DOI
https://doi.org/10.1186/2191-219X-3-25

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