Polymer conjugates of interferon-beta with enhanced...

C - Chemistry – Metallurgy – 07 – K

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C07K 17/08 (2006.01) A61K 38/21 (2006.01) A61K 47/48 (2006.01) A61P 25/28 (2006.01) A61P 31/12 (2006.01) A61P 35/00 (2006.01) C07K 14/565 (2006.01) G01N 33/50 (2006.01)

Patent

CA 2511814

Methods are provided for the synthesis of polymer conjugates of cytokines and receptor-binding antagonists thereof, especially a non glycosylated interferon- beta, which conjugates retain unusually high biological potency. Preparation of polymer conjugates according to the methods of the present invention diminishes or avoids steric inhibition of receptor-ligand interactions that commonly results from the attachment of polymers to receptor-binding regions of cytokines, as well as to agonistic and antagonistic analogs thereof. The invention also provides conjugates and compositions produced by such methods. The conjugates of the present invention retain a high level of biological potency compared to those produced by traditional polymer coupling methods that are not targeted to avoid receptor-binding domains of cytokines. In assays in vitro, the biological potency of the conjugates of non-glycosylated interferon-beta of the present invention is substantially higher than that of unconjugated interferon-beta and is similar to that of interferon-beta-1a that is glycosylated. The conjugates of the present invention also exhibit an extended half-life in vivo compared to the corresponding unconjugated cytokine. The present invention also provides kits comprising such conjugates and/or compositions, and methods of use of such conjugates and compositions in a variety of diagnostic, prophylactic, therapeutic and bioprocessing applications, including treatment of multiple sclerosis.

L'invention concerne des procédés de synthèse de conjugués polymères de cytokines et d'antagonistes se liant aux récepteurs de celles-ci, notamment un interféron-bêta, non glycosylé, ces conjugués conservant une activité biologique exceptionnellement élevée. La préparation des conjugués polymères, selon les procédés de l'invention, permet de réduire ou d'éviter l'inhibition stérique des interactions récepteur-ligand généralement engendrée par la fixation de polymères aux régions de liaison des récepteurs des cytokines et aux analogues agonistes et antagonistes de celles-ci. L'invention concerne aussi des conjugués et des compositions produits à l'aide de ces procédés. Les conjugués de l'invention conservent un niveau élevé d'activité biologique par rapport à ceux produits par des procédés de couplage de polymères classiques qui ne visent pas à éviter les domaines de liaison des récepteurs des cytokines. Dans des dosages in vitro, l'activité biologique des conjugués d'interféron-bêta non glycosylé de l'invention est sensiblement supérieure à celle de l'interféron bêta non conjugué, et est similaire à celle de l'interféron-bêta-1a glycosylé. Ces conjugués présentent aussi une demi-vie in vivo plus longue par rapport à la cytokine correspondante non conjuguée. L'invention concerne aussi des trousses comprenant ces conjugués et/ou compositions, et des procédés d'utilisation de ces conjugués et compositions dans diverses applications diagnostiques, prophylactiques et thérapeutiques, y compris le traitement de la sclérose en plaques.

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