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• W2000314711 abstract "Radionuclides or anti-cancer drugs may be coupled to antibodies for specific transport to target tissues. We have previously reported that several proteins could be rapidly and efficiently labeled with gallium (67Ga) by using deferoxamine (DFO) as a bifunctional chelating agent. In the present paper, we have described the use of hetero-bifunctional agents for the conjugation of DFO with antibodies and investigated the effect of coupling agents on in vitro properties and biodistribution of 67Ga-labeled antibodies. 67Ga-labeled monoclonal antibodies retained antigen-binding activity when prepared under optimum conditions. The use of hetero-bifunctional reagents, such as succinimidyl 6-maleimido-hexanoate (EMCS) or N-succinimidyl-3-(2-pyridyldithio)-propionate (SPDP), which link thioether bonds and disulfide bridges prevented the formation of polymerized antibodies. Although high non-specific uptake in the liver was observed with radiolabels prepared by the homo-bifunctional agent glutaraldehyde, uptake in the liver was low with conjugates linked by hetero-bifunctional agents. 67Ga-labeled antibodies with thioether bonds showed in vivo stability, but the clearance from the circulation was the fastest with the radiolabel holding disulfide bonds. The coupling reagents used to link DFO and antibodies greatly influenced both in vitro properties and in vivo distribution of labeled antibodies and 67Ga-labeled antibodies provide a good model for the study of coupling methods and biodistribution of antibody conjugates." @default.
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• W2000314711 date "1987-11-01" @default.
• W2000314711 modified "2023-10-16" @default.
• W2000314711 title "Preparation of 67Ga-labeled antibodies using deferoxamine as a bifunctional chelate an improved method" @default.
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• W2000314711 doi "https://doi.org/10.1016/0022-1759(87)90492-3" @default.
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