Mutagenized il13-based chimeric molecules

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 19/00 (2006.01) A61K 38/20 (2006.01) C07K 14/21 (2006.01) C07K 14/54 (2006.01) C12N 15/11 (2006.01) C12N 15/24 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2325341

This invention provides mutagenized interleukin 13 molecules that show improved specificity for the restricted (IL4 independent) IL13 receptor and reduced cross reactivity with the IL4/IL4 shared receptor. The mutagenized IL13 molecules include one or more mutations in a domain that interacts with the 140 kDa hIL4R.beta. or the hIL13R.alpha.1 subunit. These mutagenized IL13 molecules provide effective targeting moieties in chimeric molecules (e.g. fusion proteins) that specifically deliver effector molecules (e.g. cytotoxins) to cells overexpressing IL13 receptors (e.g. cancer cells such as gliomas).

L'invention concerne des molécules mutagénisées d'interleukine 13 présentant une spécificité accrue vis-à-vis du récepteur d'IL13 restreint (indépendant d'IL14) et une réactivité croisée réduite vis-à-vis du récepteur partagé IL4/IL4. Les molécules mutagénisées d'IL13 comportent une ou plusieurs mutations dans un domaine interagissant avec la sous-unité hIL4R.beta. ou hIL13R.alpha.?1¿ de 140 kDa. Ces molécules mutagénisées d'IL13 permettent d'obtenir des fractions cibles efficaces dans des molécules chimères (protéines de fusion, par exemple), lesquelles fractions alimentent spécifiquement en molécules effectrices (cytotoxines, par exemple) les cellules surexprimant les récepteurs d'IL13 (par exemple, des cellules cancéreuses telles que les gliomes).

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