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Published on: March 8, 2018
Preparation and in vitro studies of [125I]IUDR-T101 antibody conjugate
M C Chakrabarti1, C H Paik, J A Carrasquillo
1Department of Nuclear Medicine, Warren G. Magnuson Clinical Center, National Institute of Health, Bethesda, Maryland 20892-1180, USA.
Idoxuridine labeled with 125I was conjugated to polylysine. This conjugate was then coupled to the carbohydrate side chains of T101 monoclonal antibody (anti-CD5). The immunoreactivity, cell retention, cytotoxicity, and intracellular localization of this conjugate was tested in CCRF-CEM cells (CD5 positive). The conjugate had 68% immunoreactivity. The retention of 125I by CCRF-CEM cells was higher for the conjugate than for T101 directly labeled with 125I and more of it localized in the nucleus than did the 125I-labeled T101. The 125I IUDR-polylysine-T101 conjugate was more cytotoxic than the 125I-labeled T101. In conclusion, the conjugation of [125I]IUDR to T101 is feasible, and preferential targeting of the 125I to the nucleus is obtained.
Idoxuridine labeled with 125I was conjugated to polylysine. This conjugate was then coupled to the carbohydrate side chains of T101 monoclonal antibody (anti-CD5). The immunoreactivity, cell retention, cytotoxicity, and intracellular localization of this conjugate was tested in CCRF-CEM cells (CD5 positive). The conjugate had 68% immunoreactivity. The retention of 125I by CCRF-CEM cells was higher for the conjugate than for T101 directly labeled with 125I and more of it localized in the nucleus than did the 125I-labeled T101. The 125I IUDR-polylysine-T101 conjugate was more cytotoxic than the 125I-labeled T101. In conclusion, the conjugation of [125I]IUDR to T101 is feasible, and preferential targeting of the 125I to the nucleus is obtained.
