Targeting the Extracellular Domain of Fibroblast Growth Factor Receptor 3 with Human Single-Chain Fv Antibodies Inhibits Bladder Carcinoma Cell Line Proliferation
Purpose: Previous gene expression studies have shown that fibroblast growth factor receptor 3 (FGFR3) is overexpressed in early stages of bladder cancer. To study the potential use of therapeutic antibodies against FGFR3, we have produced a collection of human single-chain Fv (scFv) antibody fragmen...
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Veröffentlicht in: | Clinical cancer research 2005-09, Vol.11 (17), p.6280-6290 |
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Zusammenfassung: | Purpose: Previous gene expression studies have shown that fibroblast growth factor receptor 3 (FGFR3) is overexpressed in early stages
of bladder cancer. To study the potential use of therapeutic antibodies against FGFR3, we have produced a collection of human
single-chain Fv (scFv) antibody fragments by using phage display libraries.
Experimental Design: Two “naïve” semi-synthetic human scFv libraries were used to select antibodies against the extracellular domain of FGFR3α(IIIc).
The reactivity of the selected scFvs with a recombinant FGFR3 was characterized by an enzyme immunoassay and surface plasmon
resonance analysis and with RT112 bladder carcinoma cells by a fluorescence-activated cell sorter. The capacity of the selected
scFvs to block RT112 cell proliferation was determined.
Results: We have isolated six human scFv antibody fragments directed against FGFR3. These human scFvs specifically bound FGFR3, but
not the homologous molecule FGFR1. Biacore analysis was used to determine the affinity constants, which ranged from 12 to
40 nmol/L. Competition analysis showed that the FGF9 ligand was able to block the binding of two scFvs, 3C and 7D, to FGFR3,
whereas FGF1 only blocked 7D. Immunoprecipitation and flow cytometric analysis confirmed the specificity of the antibodies
to native membrane FGFR3. Two scFvs, 3C and 7D, gave an strong immunofluorescence staining of RT112 cells. Moreover, they
recognized equally well wild-type and mutant FGFR3 containing the activating mutation S249C. Furthermore, they blocked proliferation
of RT112 cells in a dose- and FGF-dependent manner.
Conclusion: Our results suggest that these human anti-FGFR3 scFv antibodies may have potential applications as antitumoral agents in
bladder cancer. |
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ISSN: | 1078-0432 1557-3265 |
DOI: | 10.1158/1078-0432.CCR-05-0282 |