Recombinant peptides derived from the mc3 anti-ba46...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/13 (2006.01) A61K 39/395 (2006.01) A61K 47/48 (2006.01) A61K 49/00 (2006.01) A61K 51/10 (2006.01) C07K 16/30 (2006.01) C07K 16/46 (2006.01) G01N 33/574 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2200097

The present invention provides recombinant peptides that specifically and selectively bind to the human milk fat globule (HMFG) antigen, BA46. In particular, the present invention provides recombinant variants of the Mc3 antibody, including humanized versions of Mc3. The variant Mc3 peptides are particularly useful for diagnostic, prognostic, and therapeutic applications in the field of breast cancer. The present invention also provides methods for the humanization of antibodies such as murine monoclonal antibodies. The novel humanization methods are applied to the production of humanized Mc3 antibodies and it is shown that these humanized antibodies retain the ability to engage in high affinity binding to their cognate antigen. Such humanization enables the use of these antibodies for immunodiagnostic and immunotherapeutic applications in humans.

La présente invention concerne des peptides recombinants qui se lient de manière spécifique et sélective à l'antigène du globule des matières grasses du lait humain (HMFG), le BA46. L'invention concerne plus particulièrement des variants recombinants de l'anticorps Mc3, y compris des versions humanisées de Mc3. Les variants peptidiques Mc3 sont particulièrement destinés à des applications diagnostiques, pronostiques et thérapeutiques dans le domaine du cancer du sein. Des procédés destinés à humaniser des anticorps tels que des anticorps monoclonaux murins sont également décrits. Ces nouveaux procédés d'humanisation sont utilisés pour la production d'anticorps Mc3 humanisés, et il est démontré que ces derniers conservent leur aptitude à présenter une liaison à haute affinité avec leur antigène parent. Une telle humanisation permet d'utiliser ces anticorps dans le cadre d'applications immunodiagnostiques et immunothérapeutiques chez l'être humain.

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