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• W1983865650 abstract "Pretargeting is an approach for enhancing the therapeutic index of radioimmunotherapy by separating the administrations of tumor-targeting substance and radiolabel. In this study, a pretargeting model system of avidin-conjugated monoclonal antibody trastuzumab and biotinylated, (211)At-labeled poly-L-lysine was constructed and analyzed in vitro.Avidin activated by 4-(N-maleimidomethyl)cyclohexane-1-carboxylic acid 3-sulfo-N-hydroxysuccinimide ester sodium salt (sulfo-SMCC) and thiolated trastuzumab were incubated overnight at 4 degrees C. The monomeric fraction was extracted using size exclusion fast protein liquid chromatography (FPLC) and further purified on an iminobiotin affinity column. Poly-L-lysine was biotinylated with succinimidyl-6-(biotinamido)hexanoate (NHS-LC-biotin), followed by direct (211)At-labeling with N-succinimidyl-3-(trimethylstannyl)benzoate (m-MeATE), and succinylation with succinic anhydride. The avidin-trastuzumab conjugate was characterized by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and FPLC, together with cell-binding and biotin-binding analyses. The labeled poly-L-lysine conjugate was assessed in terms of radiochemical purity and avidin binding. Furthermore, the full pretargeting system was evaluated in a tumor cell binding assay.The estimated size of the pretargeting molecule was 220 kDa, which corresponds to that of the expected avidin-trastuzumab monomer. Neither cell-binding ability (64%) nor biotin-binding ability (85%-95%) indicated any severe adverse effects from the chemical modifications. The radiochemical purity of the effector molecule was 92%-97%, and the avidin binding capacity was 91%-93%. The complete pretargeting assay resulted in a binding of 75.3 +/- 6.2% of added effector molecules to cells.The high binding of effector molecules to cells demonstrates a proof of concept for the synthesized molecules and pretargeting system, which will be further evaluated in vivo in future studies." @default.
• W1983865650 created "2016-06-24" @default.
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• W1983865650 date "2010-02-02" @default.
• W1983865650 modified "2023-10-11" @default.
• W1983865650 title "In vitro evaluation of avidin antibody pretargeting using 211At-labeled and biotinylated poly-L-lysine as effector molecule" @default.
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• W1983865650 doi "https://doi.org/10.1002/cncr.24798" @default.
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