Avidin dimers effective in increasing the concentration of...

A - Human Necessities – 61 – K

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A61K 47/48 (2006.01) A61K 51/04 (2006.01) A61K 51/10 (2006.01) C07K 16/30 (2006.01)

Patent

CA 2475534

Dimers of avidin and streptavidins (diavidins) are described wherein the linker is suberate, which in turn, is bound to different functional groups (- NH2 o-COOH) of avidin. As compared to avidin, the diavidins have shown the ability to increase the amount of labelled biotin on the target, when used in an in vitropretargeting test using supported human tenascin, the biotinylated anti-tenascin monoclonal antibody (Mab-B), avidin/diavidin, and biotin-3H. The use of such diavidins is also described in cancer diagnosis and anticancer therapy based on the three-step pretargeted radioimmunotherapy procedure.

L'invention concerne des dimères d'avidine et de streptavidines (diavidines) dont le lieur consiste en du subérate, qui à son tour, est lié à différents groupes fonctionnels (-NH<sb>2</sb> o-COOH) d'avidine. Par rapport à l'avidine, les diavidines présentent la capacité d'augmenter la quantité de biotine marquée sur la cible, lorsqu'elles sont utilisées dans un test de préciblage in vitro au moyen de tenascine humaine supportée, l'anticorps monoclonal antitenascine biotinylés (Mab-B), de l'avidine/diavidine, et de la biotine-<sp>3</sp>H. L'utilisation de ces diavidines est également décrit dans le diagnostic du cancer et dans les thérapies anti-cancereuses basées sur un procédé radioimmunothérapeutique préciblé en trois étapes.

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