Methods and kits for detecting antibodies against...

G - Physics – 01 – N

Patent

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G01N 33/53 (2006.01) G01N 33/534 (2006.01) G01N 33/68 (2006.01)

Patent

CA 2712021

The invention relates to the field of immunology and immunological diagnostics. More specifically, it relates to detection of the formation of antibodies in a subject that is treated with a therapeutic antibody. Provided is A diagnostic method for determining the presence of IgG antibodies against a therapeutic antibody in a subject, comprising the steps of: a) providing a solid carrier capable of binding the constant region of IgG antibodies; b) isolating a sample from a subject to be tested for the presence of IgG antibodies against a therapeutic antibody; c) incubating said carrier with said sample under conditions suitable for immobilizing IgG antibodies on said solid carrier; d) incubating said immobilized antibodies with an antigenic fragment of said therapeutic antibody under conditions that allow for complex formation between at least part of said immobilized antibodies and said antigenic fragment, said fragment lacking a constant region and being conjugated to a detectable label; and wherein said incubation is performed in the presence of an unlabeled antigenic fragment of a non- therapeutic antibody lacking a constant region. Also provided are kits for use in such a method.

L'invention concerne le domaine de l'immunologie et du diagnostic immunologique. De façon plus spécifique, l'invention porte sur la détection de la formation d'anticorps chez un sujet qui est traité par un anticorps thérapeutique. On propose un procédé de diagnostic pour déterminer la présence d'anticorps IgG contre un anticorps thérapeutique chez un sujet, comprenant les étapes consistant à : a) se procurer un porteur solide capable de se lier à la région constante d'anticorps IgG ; b) isoler un échantillon à partir d'un sujet devant être testé en ce qui concerne la présence d'anticorps IgG contre un anticorps thérapeutique ; c) incuber ledit porteur avec ledit échantillon dans des conditions appropriées pour immobiliser les anticorps IgG sur ledit porteur solide ; d) incuber lesdits anticorps immobilisés avec un fragment antigène dudit anticorps thérapeutique dans des conditions qui permettent une formation complexe entre au moins une partie desdits anticorps immobilisés et ledit fragment antigène, ledit fragment ne comportant pas de région constante et étant conjugué à un marquage détectable ; et ladite incubation étant effectuée en présence d'un fragment antigène non marqué d'un anticorps non thérapeutique ne comportant pas de région constante. L'invention porte également sur des trousses destinées à être utilisées dans ce procédé.

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