Variants of vascular endothelial cell growth factor having...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/18 (2006.01) A61K 38/18 (2006.01) A61K 39/395 (2006.01) C07K 14/52 (2006.01) C07K 16/22 (2006.01) C12N 15/85 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2267661

The present invention involves the preparation of vascular endothelial growth factor (VEGF) antagonist molecules comprising variant VEGF polypeptides which are capable of binding to and occuyping cell surface VEGF receptors without inducing a VEGF response, thereby antagonizing the biological activity of the native VEGF protein. Specifically, the variant VEGF polypeptides of the present invention comprise modifications of at least one cysteine residue in the native VEGF sequence, thereby inhibiting the ability of the variant polypeptide to dimerize through the formation of disulfide bonds. The present invention is further directed to methods for preparing such variant VEGF antagonists and to methods, compositions and assays utilizing such variants for producing pharmaceutically active materials having therapeutic and pharmacologic properties that differ from the native VEGF protein.

L'invention concerne la préparation de molécules antagonistes du facteur de croissance endothéliale vasculaire (VEGF) comprenant des variants de polypeptides de VEGF capables de se lier aux récepteurs de VEGF à la surface des cellules et de les occuper sans produire une réponse VEGF, ayant ainsi un effet antagoniste sur l'activité biologique de la protéine de VEGF native. En particulier, les variants de polypeptides de VEGF faisant l'objet de la présente invention comprennent des modifications d'au moins un résidu de cystéine dans la séquence de VEGF native, inhibant ainsi la capacité du variant de polypeptide à dimeriser par formation de ponts disulfures. La présente invention prévoir également des procédés de préparation de tels variants d'antagonistes du VEGF ainsi que des procédés, des compositions et des analyses pour lesquels on utilise de tels variants en vue de produire des matières pharmaceutiquement actives possédant des propriétés thérapeutiques et pharmacologiques qui diffèrent de la protéine de VEGF native.

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