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- W2007681758 abstract "We are investigating the use of an 211At-labeled anti-CD45 monoclonal antibody (mAb) as a replacement of total body irradiation in conditioning regimens designed to decrease the toxicity of hematopoietic cell transplantation (HCT). As part of that investigation, dose-escalation studies were conducted in dogs using 211At-labeled anticanine CD45 mAb, CA12.10C12, conjugated with a maleimido-closo-decaborate(2-) derivative, 4. Unacceptable renal toxicity was noted in the dogs receiving doses in the 0.27–0.62 mCi/kg range. This result was not anticipated, as no toxicity had been noted in prior biodistribution and toxicity studies conducted in mice. Studies were conducted to understand the cause of the renal toxicity and to find a way to circumvent it. A dog biodistribution study was conducted with 123I-labeled CA12.10C12 that had been conjugated with 4. The biodistribution data showed that 10-fold higher kidney concentrations were obtained with the maleimido-conjugate than had been obtained in a previous biodistribution study with 123I-labeled CA12.10C12 conjugated with an amine-reactive phenylisothiocyanato-CHX-A″ derivative. The difference in kidney concentrations observed in dogs for the two conjugation approaches led to an investigation of the reagents. SE-HPLC analyses showed that the purity of the CA12.10C12 conjugated via reduced disulfides was lower than that obtained with amine-reactive conjugation reagents, and nonreducing SDS-PAGE analyses indicated protein fragments were present in the disulfide reduced conjugate. Although we had previously prepared closo-decaborate(2-) derivatives with amine-reactive functional groups (e.g., 6 and 8), a new, easily synthesized, amine-reactive (phenylisothiocyanate) derivative, 10, was prepared for use in the current studies. A biodistribution was conducted with coadministered 125I- and 211At-labeled CA12.10C10 conjugated with 10. In that study, lower kidney concentrations were obtained for both radionuclides than had been obtained in the earlier study of the same antibody conjugated with 4 after reduction of disulfide bonds." @default.
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- W2007681758 date "2012-02-10" @default.
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- W2007681758 title "Reagents for Astatination of Biomolecules. 6. An Intact Antibody Conjugated with a Maleimido-<i>closo</i>-Decaborate(2-) Reagent via Sulfhydryl Groups Had Considerably Higher Kidney Concentrations than the Same Antibody Conjugated with an Isothiocyanato-<i>closo</i>-Decaborate(2-) Reagent via Lysine Amines" @default.
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- W2007681758 doi "https://doi.org/10.1021/bc200401b" @default.
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